Ausgehend von einer postulierten Abstammung der verschiedenen Gymnospermengruppen und der Angiospermen von Progymnospermen werden die Semophylesen der Samenanlagen und deren „Hüll- und Schutzorganen” eingehend besprochen. Das innere Integument ist phylogenetisch wohl aus verwachsenen sterilen Megasporangien entstanden, das aussere ist das Homologon der Cupula der Samenfarnen und ein Achsengebilde.Die dritte Hülle — die interseminalen Schuppen bei den Bennettiteen, die Chlamys bei den Chlamydospermen, die Fruchtknotenwand bei einigen Angiospermengruppen wie Pandanaceen und Cyperaceen, und der Arillus bei Angiospermen mit karpellaten Gynoezien — ist (...) wahrscheinlich aus reduzierten Samenanlagen hervorgegangen. Die vierte, aus sterilen brakteenartigen Phyllomen entstanden, hat in verschiedenen Kombinationen mit fertilen Achsen, die karpellaten Fruchtknoten der Angiospermen gebildet.Die Herkunft der Blütenpflanzen von chlamydospermen- und bennettiteen-ähnlichen Vorfahren wird sehr wahrscheinlich da Übergänge zwischen den „nackten” Samenanlagen vomGnetum-Typ und sogenannten pseudomonomeren Griffeln von Angiospermen vorliegen.En basant la phylogénie de plusieurs groupes de Gymnospermes et d'Angiospermes sur une descente des Progymnospermes du Devonien Supérieur , les sémophylèses des ovules et de ses couches protectrices ont été discuté.Le tégument interne très probablement représente une groupe de mégasporanges stériles fusés, le tégument externe est l'homologue des cupules des ptéridospermes et d'origine axillaire. La troisième couche — les écailles interséminales chez les Bennettitales, la chlamys chez les Chlamydospermes, le paroi de l'ovaire chez quelques Angiospermes comme les Pandanacées, les Piperacées..., l'arille de l'ovule dans les ovaires carpellaires des Angiospermes — est probablement l'homologue d'un nombre d'ovules steriles. La quatrième couche, constituée de phyllomes steriles, s'est associée avec des axes ovulifères en formant les pistils carpellaires des Angiospermes. L'origine des Angiospermes des ancêtres d'un type Chlamydosperme-Bennettitale est indiqué par la morphologie transitoire de quelques ovaires soi-disant „pseudo-monomères” liant les ovules „nues” du typeGnetum avec les pistils du type des Piperacées, Chloranthacées etc. (shrink)

Smartphones are increasingly entangled with the most intimate areas of everyday life, providing possibilities for the continued expansion of digital self-tracking technologies. Within this context, the development of smartphone applications targeted at female reproductive health are offering novel forms and practices of knowledge production about reproductive bodies and processes. This article presents empirical research from the United Kingdom on women’s use of fertility tracking applications, known more generally as fertility apps, while trying to conceive. Drawing on material from interviews with (...) women who had experience of using fertility apps, I demonstrate the significance of this particular form of fertility tracking for the embodied shift from pregnancy prevention to actively facilitating pregnancy, participants’ sense of self and identity and how they perceived the reproductive potentiality of their bodies. I argue that fertility apps are significantly involved in making fertility cycles known and thus configuring the pre-pregnant reproductive body. (shrink)

: On the grounds that rape is an act of violence, not a natural act of intercourse, Roman Catholic teaching traditionally has permitted women who have been raped to take steps to prevent pregnancy, while consistently prohibiting abortion even in the case of rape. Recent scientific evidence that emergency contraception (EC) works primarily by preventing ovulation, not by preventing implantation or by aborting implanted embryos, has led Church authorities to permit the use of EC drugs in the setting of (...) rape. Doubts about whether an abortifacient effect of EC drugs has been completely disproven have led to controversy within the Church about whether it is sufficient to determine that a woman is not pregnant before using EC drugs or whether one must establish that she has not recently ovulated. This article presents clinical, epidemiological, and ethical arguments why testing for pregnancy should be morally sufficient for a faith community that is strongly opposed to abortion. (shrink)

Le présent article porte sur la trame relationnelle tissée autour de l’enfant né par gestation pour autrui ou conçu grâce à un don d’ovules, et plus spécifiquement sur les affiliations familiales qui émergent de ce processus inédit d’enfantement à plusieurs. La démonstration s’appuie sur les récits de 38 femmes canadiennes impliquées dans une entente de procréation assistée avec autrui en tant que mères, femmes porteuses ou donneuses. Deux cas de figure mettant en lumière la construction des liens d’apparentement entre les (...) personnes concernées sont présentés, qu’il s’agisse d’une inscription dans le réseau de parenté de l’enfant ou d’une reconnaissance symbolique mutuelle basée sur l’amitié. La proximité relationnelle entre les adultes est au cœur d’une filiation métissée qui témoigne de leur préoccupation commune envers l’intérêt de l’enfant. (shrink)

The origin of metazoa implies the passage from an eukarote protozoan to a protozygote ancestor of a metazoan zygote. The most probable hypothesis is that of a symbiotic origin of the first zygote by association of two protists one signifying a spherical oocell and the other a flagellated spermatozoan; this could be the first step of the metazoan ontogenesis and therefore also of the phylogenesis. The genesis can also be explained by two haploid genomes NX NY, three gametes (two spermatozoa (...) and one ovule), NX apparently being able to create both forms, and two zygotes. A double symbiosis, a chromosomic crossing-over and a selective expulsion can prove it. (shrink)

SummaryCross-sectional studies in Australia and the Philippines and a longitudinal prospective study in a selected Australian sample of breast-feeding mothers have shown that basal serum prolactin concentrations are elevated during 15–21 months of lactational amenorrhoea.A predictive model of serum PRL levels and return of cyclic ovarian activity during full breast-feeding, partial breast-feeding and weaning has been developed from the results of breast-feeding behaviour and serum PRL, gonadotrophin and oestradiol measurements in 34 mothers breast-feeding on demand for a mean of 67 (...) weeks.Breast-feeding patterns influence serum PRL levels. Important factors during full breast-feeding are the age of the baby, the longest interval between feeds at night and total 24-hr suckling time, and following the introduction of supplements, the mean interval between feeds, together with the total 24-hr suckling time and the number of solid supplements per day.The precise mechanisms whereby breast-feeding regulates cyclic ovarian activity remain unknown. Gonadotrophin secretion appears to be quantitatively normal, but qualitative changes, secondary to altered hypothalamic activity, may be the most important factor. A direct inhibitory effect of PRL on ovarian follicular development and steroidogenesis remains possible.Ovulation with a normal luteal phase is probable for 30% of breast-feeding mothers before the first menses, but is unlikely before 6 months, provided breast-feeding is frequent day and night.Measurement of serum PRL is a sensitive index of the return of menstruation and fertility during lactation in the population studied. (shrink)

Lacker (1981) and Lacker & Akin (1988) developed a mathematical model of follicular maturation and ovulation; this model of only four parameters accounts for a large number of results obtained over the past decade or more on the control of follicular growth and ovulation in mammals. It establishes a single law of maturation for each follicle which describes the interactions between growing follicles. The function put forward is sufficient to explain the constancy of the number of ovulations or (...) large follicles in a female as well as the variability of this number among strains or species and for either induced or spontaneous ovulators. According to the model, the number of ovulations or large follicles lies between two limits that are themselves simple functions of two parameters of the model. Moreover, Lacker's model exhibits interesting characteristics in agreement with results obtained by physiologists: in particular, it predicts that the number of ovulating or large follicles is independent of:1. the total number of maturing follicles, 2. the process of recruitment of newly maturing follicles towards the terminal maturation (Poisson or other), 3. the form of the LH or FSH secretion curves as functions of the systemic level of oestradiol. The model further predicts that 4. selection and dominance of follicles result from the feedback between the ovary and the hypophysis through the interactions between follicles; these interactions are expressed by the maturation function of the model. 5. recovery from atresia is possible for a follicle: from decreasing, the rate of secretion of oestradiol may increase. 6. the revised model suggests a renewal of follicles during the sexual cycle, as waves of follicular growth. Lacker's model is a model of strict dominance; it maintains a hierarchy of the follicles as soon as they start their final maturation to the ovulations as that is observed in bird or reptile ovary. Such a strict hierarchy is possible but it is probably not a general situation in all mammals. We therefore modified the maturing function of the follicle in order to make it compatible with the observations of physiologists: follicles always interact as in the initial model but they individually become old, the hierarchy of follicles can be modified with time and the largest follicles do not indefinitely grow as in the initial model. (shrink)

Stem cell research has important implications for medicine. The source of stem cells influences their therapeutic potential, with stem cells derived from early-stage embryos remaining the most versatile. Somatic cell nuclear transfer (SCNT), a source of embryonic stem cells, allows for understandings about disease development and, more importantly, the ability to yield embryonic stem cell lines that are genetically matched to the somatic cell donor. However, SCNT requires women to donate eggs, which involves injection of ovulation-inducing hormones and egg (...) retrieval through laparoscopy or transvaginal needle aspiration. Risks from this procedure are fiercely debated, most notably risk of ovarian hyperstimulation syndrome (OHSS). This review examines risk of OHSS resulting from oocyte donation. We conclude that risk posed by OHSS in egg donation is not significant enough to warrant undue concern, and much of this can be eliminated when proper precautions are taken. This bears relevance to the future of stem cell research policymaking. (shrink)

In this paper I will explore a phenomenology of the menstrual cycle, focusing on the cycle’s rhythm as a form of lived temporality. Drawing on the work of Henri Lefebvre and Thomas Fuchs I will outline a key connection between embodiment and rhythmic temporality more generally, before applying this analysis to the rhythm of the menstrual cycle specifically. I will consider the phenomenology of the experience of cycling through the phases of pre-ovulation, ovulation, pre-menstruation and menstruation as a (...) pattern, or specifically an embodied rhythm that constitutes a form of lived temporality. I will consider a way that the subject may potentially be alienated from this rhythm as a result of a dominant cultural narrative of “linear time”. I will argue further that this dissonance between the menstrual body and the contemporary world tends to be compounded by a lack of “menstrual literacy” in education and culture. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:The Pleasures of FictionDenis DuttonHuman Beings Expend staggering amounts of time and resources on creating and experiencing art and entertainment—music, dancing, and static visual arts. Of all of the arts, however, it is the category of fictional story-telling that across the globe today is the most intense focus of what amounts to a virtual human addiction. A recent government study in Britain showed that if you add together annual (...) attendances in plays and cinema with hours watching television drama, the average Briton spends roughly 6% of all waking life watching dramatic performances. And that figure does not even include books and magazines: further vast numbers of hours spent reading short stories, bodice-rippers, mysteries, and thrillers, as well as so-called serious fictions, old and new.The origins of this obsession with comic and dramatic fictions are lost in remote prehistory, as lost as the origins of language itself. But like language, we know the obsession with fiction is universal: stories told, read, and dramatically or poetically performed are independently invented in all known cultures, literate or not, having advanced technologies or not. Wherever printing arrives, it is used to reproduce fictions. Whenever television appears in the world, soap operas soon show up on the schedule. Both the forms that fiction takes and the ideas, types of characters, and kinds of conflict that make up its content can be shown to be strikingly similar across cultures. It has specialist practitioners—rhapsodes, novelists, playwrights, actors—and is governed both informally with stylistic conventions and sometimes formally—for example, by censorship laws. A love of fiction is as universal as governance, marriage, jokes, religion, and the incest taboo. [End Page 453]The question for any general aesthetics is: Why? Joseph Carroll is a literary theorist who has applied his probing mind over the last decade to the origins, nature, and functions of literary experience. His new collection of essays and reviews, Literary Darwinism: Evolution, Human Nature, and Literature (Routledge, $85.00 boards, $23.95 paper) looks at literature and literary theory through the lens of evolutionary psychology. At the same time, Carroll's eye is that of an extremely perceptive literary critic. In fact, I would judge him to be one of the most acute and knowledgeable readers of fiction I've ever encountered. It should not come as a surprise, therefore, that he is sometimes dubious, or even scathing, about evolutionary explanations of literature that have been offered up by writers whose grasp of psychology exceeds, in his opinion, their command of high literature. His complaints, however, are not to the fundamental notion that evolution by natural and sexual selection have made human beings into the story-loving animals they have become: his adjustments are intended to increase the accuracy and usefulness of Darwin's revolution. However critical he is of evolutionary psychologists, Carroll remains a Darwinian through and through.Carroll holds that the only way to attain a general theory of literature is through an account of human nature that builds from the ground up, from the most basic conditions for the evolution of the human species. A Darwinian literary theory first needs a Darwinian psychology. Once we have a basic Darwinian psychology in place, we can see that the narrative proclivities of human beings, far from being an incidental by-product of the evolved mind, are central to some of its most human functions. The structures of basic motives and dispositions are what would be appropriate for a species, as Carroll describes it, that "is highly social and mildly polygynous, that displays concealed ovulation, continuous female receptivity, and postmenopausal life expectancy corresponding to a uniquely extended period of childhood development, that has extraordinary aptitudes for technology, that has developed language and the capacity for peering into the minds of its conspecifics, and that displays a unique disposition for fabricating and consuming aesthetic and imaginative artifacts." Such a list alone, he contends, would make it impossible to imagine a blank-slate view of the mind, in which the mind evolves in a vacuum, goes onto produce culture, which then gives back to the mind all content and structure.Some of the mental processes that grow from... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Kennedy Institute of Ethics Journal 16.4 (2006) 379-396MuseSearchJournalsThis JournalContents[Access article in PDF]Pharmacists and Conscientious Objection *In March 2005, a Wisconsin pharmacist's act of conscience garnered headlines across the United States. After a married woman with four children submitted a prescription for the morning-after pill, the pharmacist, Neil Noesen, not only refused to fill it, but also refused to transfer the prescription to another pharmacist or to return the prescription (...) to the customer. As more such incidents occurred, many states "... decided to consider and enact laws setting the bounds of pharmacists' and other health care workers' professional obligations" (III, Grady 2006, p. 327). Discussions of objector legislation, also referred to as "conscience clauses," "refusal clauses," and "abandonment laws" (III, Appel 2005, p. 279), are not limited to professional ethics, but also draw from philosophical, theological, and legal perspectives. The purpose of this Scope Note is to present a wide variety of viewpoints on the health provider's right to conscience.More than 40 years ago the development of "The Pill" as the first reliable method of birth control not only ushered in a feminist revolution, but also provided a new focus for concerns of conscience for those who were part of the anti-abortion movement based on religious belief in the sanctity of life. Similarly, in the past ten years, worldwide, and seven years (1999) since the emergency contraception "morning after" pill first became available as a prescription item, there has been an upsurge in the number of medical personnel who refuse to prescribe or dispense it on grounds of personal conscience, whether for religious reasons or not. Their actions bring into play issues of power and control for health care personnel and for patients—in this case women, which also raises women's rights issues. Ironically, studies in France, Sweden, and the United Kingdom have shown that emergency contraception does not reduce the abortion rate—it is too infrequently used (II, Glasier 2006).It is important to underline the difference between the "morning-after" pill or "Plan B," which is made up of two progestin pills containing levonorgestrel (a synthetic derivative of the female hormone progesterone), and RU-486 (Mifiprex [End Page 379] or mifipristone with misoprostol). Plan B, if taken within 72 hours post-coitus prevents implantation, and therefore pregnancy, by suppressing the output of luteinizing hormone, the hormone that triggers the ovulation process. Scientists have been unable to determine whether this action could destroy already fertilized eggs, but even if it does, it uses the same mechanism as occurs with the birth-control pill, that was developed some 45 years ago. By contrast, RU-486 acts up to 49 days after implantation by blocking the action of progesterone in order to terminate the pregnancy and as such is an abortifacient (II, US FDA 1).On 24 August 2006, the U.S. Food and Drug Administration announced approval of the Plan B pill for over-the-counter (OTC ) sales (II, US FDA 2). Although this action makes the drug more widely available, it remains to be seen whether pharmacists who are conscientious objectors and who refuse to dispense it also will refuse to provide it OTC.A survey article by Rebecca Dresser (II, 2005, p. 9) succinctly sums up the problem for conscientious objectors: "Because emergency contraception can act to block implantation of a fertilized egg, people who believe in protection of human life after conception find it morally objectionable."When conscientious objections are raised over abortion or birth control services performed, prescribed, or dispensed, they affect not only the health professionals—physicians, pharmacists, nurses, and health technicians—who may object, as well as their colleagues and/or managers, but also the consumers: the female patients who are then forced to reconsider or to seek an alternative supplier, as well as their spouses or partners. Alta Charo (II, 2005, p. 2473) makes the point that the patient needs to have access to a system of counseling and referral "so... (shrink)

There are a growing number of examples where naturally occurring mutations disrupt an established physiological or developmental pathway to yield a new condition that is evolutionary favored. Asexual reproduction by seed in plants, or apomixis, occurs in a diversity of taxa and has evolved from sexual ancestors. One form of apomixis, diplospory, is a multi‐step development process that is initiated when meiosis is altered to produce an unreduced rather than a reduced egg cell. Subsequent parthenogenetic development of the unreduced egg (...) yields genetically maternal progeny. While it has long been apparent from cytological data that meiosis in apomicts was malfunctional or completely bypassed, the genetic basis of the phenomenon has been a long‐standing mystery. New data from genetic analysis of Arabidopsis mutants1 in combination with more sophisticated molecular understanding of meiosis in plants indicate that a weak mutation of the gene SWI, called DYAD, interferes with sister chromatid cohesion in meiosis I, causes synapsis to fail in female meiosis and yields two unreduced cells. The new work shows that a low percentage of DYAD ovules produce functional unreduced egg cells (2n) that can be fertilized by haploid pollen (1n) to give rise to triploid (3n) progeny. While the DYAD mutants differ in some aspects from naturally occurring apomicts, the work establishes that mutation to a single gene can effectively initiate apomictic development and, furthermore, focuses efforts to isolate apomixis genes on a narrowed set of developmental events. Profitable manipulation of meiosis and recombination in agronomically important crops may be on the horizon. BioEssays 30:798–801, 2008. © 2008 Wiley Periodicals, Inc. (shrink)

In a poem setting forth the way things are in nature, it is fitting for Lucretius to address, among many other phenomena, human conception and embryonic determination. With an eye toward ethics, Lucretius demonstrates how sexual reproduction at the seminal level can be explained by Epicurean atomism. In this paper, I am concerned with the biological ‘how’ of conception as explained inDe Rerum Natura(=DRN) but also with the ethical ‘therefore’ for Lucretius’ readership and (over)estimations of male autonomy. For modern audiences (...) with a basic grasp of procreation that includes sperm supplied by a male and egg supplied by a female, encountering Lucretius’ verses on women contributing semen (semina) to the process of conception can be surprising (4.1209–62). The idea of female semen may give us pause as we calibrate it with our understanding of eggs and ovulation, but Lucretius, in his time, was not advancing some novel theory. Wading into established debates on male-only or joint male-female semen production and gendered insemination (that is, who produces semen and whose semen is active at conception), Lucretius sides with those promulgating mutuality for both questions (for example Democritus [DK 24 A13]) and rejects Aristotle's representative exclusivist claim of male activity vs female passivity (τὸ ἄρρεν ἐστὶν ὡς κινοῦν καὶ ποιοῦν, τὸ δὲ θῆλυ ὡς παθητικόν,Gen. an.729a28–30; cf. 726a30–6). That is to say, a sexually mature female, like her male counterpart, emits semen that has determining potency in the formation of a human embryo (Lucr. 4.1209–62). Although the discharge and activity of female semen is the focus of this paper, my investigation is not aQuellenforschungor historical survey of Greco-Roman ideas about women's contributions to insemination and fertility, since others have treated these matters extensively. I concentrate rather on how Lucretius employs the concept of female semen in terms of his poetics in Book 4 and what I see as an ethical argument against the domineering nature of Roman masculinity. The problem of female semen, from the point of view of Lucretius’ Roman male audience, is that it is potentially costly to men because it rivals and threatens their status from the physiological to the discursive level. Iain Lonie broaches the same issue from Greek perspectives. (shrink)

Even a small percentage of missing data can cause serious problems with analysis, reducing the statistical power of a study and leading to wrong conclusions being drawn. In the case of monitoring a woman’s monthly cycle, missing entries can appear even in a woman experienced in fertility awareness methods. Due to the fact that in a system of controlling a woman’s fertility, it is the most important to predict the day of ovulation and, ultimately, to determine the fertile window (...) as much precisely as possible, much attention should be paid to the quality of the used data. This paper presents the results of handling missing observations as far as predicting the time during the cycle when a woman can become pregnant is concerned. Data taken from a multinational European study of daily fecundability was used to learn the quantitative part of the variety of a higher-order dynamic Bayesian network modeling a woman’s monthly cycle. The main goal of this paper is to examine whether omitting observations has an influence on the model’s reliability. The accuracy of comparison was examined based on two measures: the average percentage length of the infertile time during the monthly cycle and average percentage of days inside the fertile window classified as infertile. (shrink)

A new hypothesis is proposed to explain the perennially enlarged breasts of human females. The nubility hypothesis proposes that hominid females evolved protruding breasts because the size and shape of breasts function as an honest signal of residual reproductive value. Hominid females with greater residual reproductive value were preferred by males once reliable cues to ovulation were lost and long-term bonding evolved. This adaptation was favored because female-female competition for investing males increased once hominid males began to provide valuable (...) resources. (shrink)

Oncofertility is one of the 9 NIH Roadmap Initiatives, federal grants intended to explore previously intractable questions, and it describes a new field that exists in the liminal space between cancer treatment and its sequelae, IVF clinics and their yearning, and basic research in cell growth, biomaterials, and reproductive science and its tempting promises. Cancer diagnoses, which were once thought universally fatal, now often entail management of a chronic disease. Yet the therapies are rigorous, must start immediately, and in many (...) cases result in premature failure of the body's reproductive ability. In women, this loss is especially poignant; unlike the routine storage of sperm, which is done in men and boys facing similar treatment decisions, freezing oocytes in anticipation of fertility loss is not possible in most cases, and creating an embryo within days of diagnosis raises significant moral, social and medical challenges. Oncofertility is the study of how to harvest ovarian tissue in women facing cancer to preserve their gametes for future use with IVF, thus allowing the decisions about childbearing to be deferred and reproductive choices to be preserved. The research endeavor uses the capacity of the ovarian follicle to produce eggs in vitro . Developing the human follicle to ovulate successfully outside the body is scientifically difficult and ethically challenging. Infertility is linked to long-standing religious and moral traditions, and is intertwined with deeply contentious social narratives about women, families, illness and birth. Is the research morally permissible? Perhaps imperative if understood as a repair from iatrogenic harms? How are considerations of justice central to the work? How will vulnerable subjects be protected? What are the moral implications of the work for women, children and families? What are the implications for society if women could store ovarian tissue as a way of stopping the biological clock? What are the moral possibilities and challenges if eggs can be produced in large quantities from a stored ovarian tissue? (shrink)

Ce travail traite des représentations médicales des organes génitaux féminins et de leur participation à la fécondation. Il étudie la façon dont la topographie de ces organes se modifie progressivement en fonction des théories de la génération qui se succèdent à partir du XVIIe siècle. Il décrit en particulier l’émergence des trompes, qui font l’objet d’une réévaluation qui culmine au XVIIIe siècle. Ce rôle prépondérant des trompes s’efface toutefois au XIXe siècle, avec la découverte de l’ovulation spontanée, qui ramène (...) l’appareil génital féminin à un statut passif. (shrink)

According to some psychological studies, women approaching ovulation feel the increased desire to have short-term sexual affairs with “sexy cads” while they are in long-term relations with “good dads.” I argue that this psychological property is a vestige of our evolutionary history. Early hominid females occasionally acquired good genes from top-ranking males while they were in long-term relations with low-ranking males. The Paleolithic living conditions indicate that women with the foregoing psychological trait were more likely to have viable children (...) than those without it. Sexy cads are the descendents of the top-ranking males, and good dads are the descendents of the low-ranking males. Sexy cads and good dads will continue to coexist in the future, developing better methods to detect cheaters and to escape detection. (shrink)

Concealed fecundity and extended female sexual receptivity have evolved in some primates, including humans, conferring advantages both within primarily monogamous relationships and from extrapair liaisons. As humans evolved the intellectual capacity for decision-making, women became capable of altering their own fertility. In some circumstances, they may choose to ameliorate risks and responsibilities associated with pregnancy by reducing sexual motivation near the perceived most fecund time of their menstrual cycle. But three findings—a general inability of women to accurately recognize their own (...) intervals of fecundity, high variability in ovulation timing, and unconscious transmission and reception of cues associated with fecundity—constitute a physiological and behavioral syndrome that can be considered self-deception. In this study, I develop a descriptive model to determine implications of the hypothesis that these features of female and male physiology and behavior have been shaped by natural selection in response to female decision-making. My analysis shows that consensus motivation for coitus between partners influences both the importance of variable ovulation date and the probability of conception, under the influence of self-deception. It also identifies priorities for future empirical work. (shrink)

Glossina or tsetse flies, the vectors of sleeping sickness, form a unique group of insects with remarkable characteristics. They are viviparous with a slow rhythm of reproduction (one larva approximately every 10 days) determined by the regular ovulation of alternate ovaries. This unusual physiology enables the age of the females to be estimated by examining the ovaries.The resulting ovarian age structure of tsetse fly populations has been used to develop research into the demography of tsetse flies. Several authors have (...) proposed methods of estimating population growth rates from ovarian age distribution data. However, such methods are applicable only when the growth rate () is equal to 1 (i.e. the intrinsic rate of increase r is equal to 0). In fact, in this type of estimation, the adult survival rate a (or equivalently the mortality rate) cannot be dissociated from the growth rate. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Michael’s Story or the Paradox of NormalcyMichael KreuzerI was born in Montreal in 1974. My parents were both “older.” My mother was almost 45; my father was in his 50’s. I have a sister who is six years older than me. What I know about my mother’s prenatal care is that it was quite basic.I was premature. My mother’s due date was in mid–August, however I showed up about (...) three weeks earlier. I know that initially upon my birth I was declared male. However, upon closer examination, a few “abnormalities” of my genitals were found. I urinated through a small hole at the base of my penis; adjacent to this hole was another opening, barely big enough for a Q–tip. My scrotum was empty; my gonads had not descended.The doctors who examined me decided that they could not assign a gender without further testing. They told my mother I would need to remain in the hospital until such testing was completed. Apparently not being able to determine sex/gender is a life–threatening condition that requires hospitalization.It was determined that I had a uterus and it was presumed that my undescended gonads were ovaries (not verified by biopsy). There was a small vaginal opening behind my small urethral opening. Structures such as the labia were not developed. I found out later my vagina had fistulated into both my urethra and my perineum. Karyotyping was performed resulting in 46,XX with a diagnosis of female pseudo–hermaphroditism. My parents were informed that in spite of my external genitalia I was female and I would never develop as a male. I would require “corrective surgeries” which should be performed as soon as possible so I would not have any issues with my gender identity. They were even told that I would be able to become pregnant if I had the surgeries. In fact, I never ovulated and I have a small unicornuate uterus.My father refused all surgeries on my behalf most likely because he was a full–blooded Navajo who had suffered from abuse in an Indian boarding school during his childhood in New Mexico. His family was traditional, and because they didn’t adapt to prevailing Christian values, he and several of his siblings were removed from their parents. My dad was the oldest of 12 children and by the time his youngest siblings were born, the practice to take children away from their families had been changed.I think my father was deeply traumatized by his childhood and did not associate much with his family, nor did he want to visit the reservation. He spoke the language but never encouraged us to learn it. He did teach us some of the traditions. He told me about the nadleh, which is the other gender besides male and female in the Navajo tradition. There are two kinds of nadleh, which are almost like male–to–female and female–to–male transsexuals. Mostly I educated myself later and learned about the Navajo belief system in which the creation story is an important part. In the Navajo tradition, the creation story tells of First Man and First Woman; the first children born to them are the Hermaphrodite Twins. [End Page E7]My father was a US Army Master Sergeant, which was an unusual career for a man of his origins; he was a veteran of the Second World War. After he left the army he took his family to Montreal where he had a job in security. I think he preferred to live outside the U.S. He used to say that in Germany, where he had managed to stay for a long time while serving in the Army, he was just another American soldier. In spite of his career, he had a deep mistrust for “white people.” I remember he used to say that he was in the Army because this was his country long before the white people came and he loved it. He did not love the people who governed it. All this very much played into the decision not to listen to the doctors’ recommendations about surgery. My... (shrink)

Levonorgestrel is widely used as emergency contraception, yet much confusion surrounds its use. Consensus statements and reviews typically attribute its efficacy to prefertilization mechanisms of action, such as suppression of ovulation and interference with cervical mucus or sperm function, yet studies do not rule out a postovulatory MOA. To yield greater clarity, the authors review recent scientific studies examining the MOAs of LNG-EC. They conclude that LNG-EC exerts minimal effects on cervical mucus and sperm function and that suppression of (...) ovulation is not the dominant MOA accounting for the contraceptive efficacy of LNG-EC. Luteal deficiencies and endometrial changes reported in the literature strongly suggest a postovulatory MOA when LNG-EC is given during the critical preovulatory period. National Catholic Bioethics Quarterly 13.4 : 677–716. (shrink)

SummaryThe effects of infant suckling patterns on the post-partum resumption of ovulation and on birth-spacing are investigated among the Gainj of highland New Guinea. Based on hormonal evidence, the median duration of lactational anovulation is 20·4 months, accounting for about 75% of the median interval between live birth and next successful conception. Throughout lactation, suckling episodes are short and frequent, the interval changing slowly over time, from 24 minutes in newborns to 80 minutes in 3-year olds. Maternal serum prolactin (...) concentrations decline in parallel with the changes in suckling patterns, approaching the level observed in non-nursing women by about 24 months post-partum. A path analysis indicates that the interval between suckling episodes is the principal determinant of maternal prolactin concentration, with time since parturition affecting prolactin secretion only in so far as it affects suckling frequency. The extremely prolonged contraceptive effect of breast-feeding in this population thus appears to be due to a slow decline in suckling frequency with time since parturition and absence of a decline over time in hypothalamic–pituitary responsiveness to the suckling stimulus. (shrink)

This article explores the idea of agential multiplicity in medical treatment of childlessness. The analysis illustrates the kinds of agencies that emerge in the use of assisted reproductive technologies. The article begins with a discussion on feelings as participants in IVF treatment and as elements of women’s embodied experience. This is followed by an analysis of three consecutive steps of IVF: ovulation induction, assisted fertilization in the laboratory and embryo transfer. The article aims to show that feminist theory and (...) praxis benefits from empirical analyses of lived bodily experiences as they take form in relation to non-human agencies. Also, it provides a view into how biological processes and material elements can be taken into account in anti-essentializing ways in feminist research. (shrink)

Temporal Changes in Ovarian Gonadotropin-Releasing Hormone mRNA Levels by Gonadotropins in the Rat Sung Ho Lee, Eun-Seob Song, Sun Kyeong Yu, Changmee Kim, Dae Kee Lee, Wan Sung Choi l and Kyungjin Kim* Department of Molecular Biofogy and SRC for Cell Differentiation, Seoul National University, Seoul 150-742, Korea; IDepartment of Anatomy, College of Medicine, Gyeongsanf; National University, Chinju 660-280, Korea (Recei·. cd on December 29, 1993) The present study examines whether gonadotropins are involved in the regulation of ovarian GnRH gene (...) expression and how ovarian GnRH gene expression temporalJy correlates with alterations in hypothalamic GnRH, pituitary LH~ gene expression in respons to gonadotropins. Hypothalamic and ovarian GnRH mRNA and pituitary LH~ mRNA levels were determined by respective RNA-blot hybridizations, and ovarian GnRH and estradiol contents and serum LH levels were measured by respective radioimmunoassays. Three animal models such as 1) PMSG-treated, 2) PMSG and heG-treated immature rats and 3) proestrous stage of adult rats were used. Immature rats (25-days old) were administered with PMSG (10 iu) at 10:00 hand 48 h later with heG (10 iu) to induce ovulation. In the PMSG-injected model, hypothalamic GnRH mRNA levels were markedly augmented about 9-fold at 50 h, and pituitary LH mRNA 3-fold at 52 h after PMSG administration. Serum LH levels were increased to the preovulatory surge levels at 56 h, and ovarian GnRH mRNA levels were augmented 4-fold at 60 h after PMSG injection. Administration of heG also induced a marked enhancement in ovarian GnRH mRNA levels in comparison to the values shown in both intact and PMSGtreated rats at 52 hand 54 h, respectively. In the proestrous stage of normal adult rats, pituitary LH~ mRNA levels were peaked at 16:00 h. The preovulatory LH surge was evident at 4 h before increment in ovarian GnRH mRNA levels as shown in PMSG-treated rats. The present study clearly showed the sequential increase in hypothalamic GnRH mRNA, pituitary LH~ mRNA and ovarian GnRH mRNA levels, indicating that ovarian GnRH may play a possible role in the control of follicular maturation and the ovulation process. (shrink)

This article examines the construction of parenthood, drawing on Brazilian cisgender, heterosexual, and homosexual couples' experiences in using assisted reproduction technologies (ART), particularly the surrogacy. For that purpose, we interviewed: 1) a lesbian woman who had her daughter through her partner's pregnancy, using ART with anonymous donor semen; 2) a gay man who, together with his partner, used a surrogacy service under contract via a specialised offshore agency; 3) a woman who was a surrogate, in Brazil, for her sister-in-law and (...) brother who lived abroad and, from abroad, sent an embryo fertilised for surrogacy; 4) a woman who resorted to her sister-in-law in order to be a mother by surrogacy, with ovules from the woman herself fertilised with semen from her husband; and 5) the sister-in-law mentioned in 4), who acted as surrogate for her brother and his wife. These interviews made it possible to think about the discursive construction of the legitimacy of such parenthoods, as it is produced by access to, and manipulation and circulation of, reproductive technologies and persons. This biomedical management of bodies sets up a material and discursive circuit that, in turn, produces a complex web of personal, normative, legal, professional and market relationships, particularly with a view to construction of a parenthood anchored in a notion of biologically-constituted origin. In this respect, biological, affective and social bonds merge to produce a precise placement of who is the father and/or who is the mother, as well as who are the important others and how they are linked to the child in a broader web of parenthood. (shrink)

The hydrogen market in the world today is capable ovule and empirical evidence on activity of patents in fuel cells and hydrogen production is limited so far. Patent applications in zero-emission mobility in the aspect of fuel cells include: DAFC/dmfc&dmfc, PEMFC, SOFC, AFC, PAFC. As for the patents relating to the hydrogen production, they concern low carbon, electrolysis and inorganic. The purpose of the study was to investigate certain aspects of the activity of patents in fuel cells and hydrogen production (...) in the context of passenger car fleet in the Visegrad group (V4) countries and to explore the relationship between patent registrations and GDP per capita in V4. The research area relates to the answer to the question of whether a country’s involvement in zero-emission patent activity (patents in fuel cells and hydrogen production) could contribute to the renewal of the country’s passenger car fleet. The theses were formulated as follows: 1) activity of patents in fuel cells and hydrogen production in the V4 countries doesn’t depend on the car fleet in these countries, 2) the level of GDP per capita in the V4 countries is not followed by the number of patents registrations in hydrogen technology, 3) the highest patent activity in fuel cells and hydrogen production doesn’t mean that the car fleet in these country will be zero-emission in coming years. The method used in this article is a comparative analysis, but also the relationships between patent registrations, GDP per capita and passenger car fleet in V4 are considered. (shrink)

Since the decade of the 1970s, and particularly since the first successful test-tube baby in 1978, the development and use of assisted reproductive technologies have grown exponentially. Would-be parents—including those in so-called traditional male-female marriages, unmarried adults, postmenopausal women, and same-sex partnerships—who just over 20 years ago had no recourse for their fertility issues can now pursue their desires to have children with at least a partial, if not, total, genetic and/or biological relationship. Ovulation-stimulating medications, artificial insemination using the (...) sperm of a husband or unrelated donor, in vitro fertilization with embryo transfer, intracytoplasmic sperm injection, and gamete and zygote intrafallopian transfers are but a few of a host of treatment options ranging in complexity, invasiveness, and expense. And on the horizon are genetic techniques such as cloning—which was once considered “pure” science fiction but in 1997 became what some call an inevitability, with the development of mammalian cloning in the form of the now-famous Dolly the sheep. (shrink)

The mammalian oocyte is a round cell arrested at prophase I of meiosis. It is characterized by the presence of a large nucleus, called the germinal vesicle, in the middle of which is the nucleolus. Before it can be fertilized, the oocyte must resume meiosis, enter metaphase II and be ovulated. The nucleolus is dissolved during this process. However, the nucleoli of the male and female pronuclei in the zygote are both of maternal origin. A recent paper1 demonstrates that the (...) maternal nucleolus, together with other nucleoplasmic elements, is essential for early embryonic development. These nucleolar and nucleoplasmic factors remain undetermined. BioEssays 30:613–616, 2008. © 2008 Wiley Periodicals, Inc. (shrink)

By inferences from fossil records and circumstantial evidences, it is now generally postulated that angiosperms have a much longer history than hitherto believed and that they have already existed probably in Jurassic time. Studies in vascular tissues and reproductive, structures have negated the possibility of originating angiosperms from various gymnosperm groups. Chronologically, this derivation will be also an impossibility.From a consideration of various aspects in the life history of angiosperms, a hypothesis is here presented postulating that protangiosperms originated in an (...) aquatic or subaquatic environment from an algal ancestry. The enclosure of ovules in the ovary is interpretated as a means of protection necessitated for the transmigration from an aquatic to an aerial habitat for the developing reproductive parts in the bud underwater. Trimery is suggested as a primitive condition, one that affords maximum efficiency in carrying out the purpose under the conditions.In the life history of angiosperms, the endosperm is of great significance in phylogeny. From morphological, physiological, cytological as well as genetical considerations, the endosperm should be regarded as of equal status with the gametophytic and sporophytic generations. There is no comparable structure in the gymnosperm groups and the ferns and “fern-allies”, while more or less similar conditions are present in the thallophytes. In the long life histories of many red algae, however, there is an especially notable resemblance to angiosperms, with certain details approaching the unique and characteristic features of the endosperms.Land plants are presumably all evolved from aquatic ancestors but instead of the usual concept of a monophyletic origin and lineal development of all vascular plants, a more plausible suggestion is the multiple and recurrent derivation of such plants from various algal ancestral groups. The angiosperms probably represent one of such major lines that originated more or less directly from a thallophytic ancestry. (shrink)

Oncofertility is one of the 9 NIH Roadmap Initiatives, federal grants intended to explore previously intractable questions, and it describes a new field that exists in the liminal space between cancer treatment and its sequelae, IVF clinics and their yearning, and basic research in cell growth, biomaterials, and reproductive science and its tempting promises. Cancer diagnoses, which were once thought universally fatal, now often entail management of a chronic disease. Yet the therapies are rigorous, must start immediately, and in many (...) cases result in premature failure of the body's reproductive ability. In women, this loss is especially poignant; unlike the routine storage of sperm, which is done in men and boys facing similar treatment decisions, freezing oocytes in anticipation of fertility loss is not possible in most cases, and creating an embryo within days of diagnosis raises significant moral, social and medical challenges. Oncofertility is the study of how to harvest ovarian tissue in women facing cancer to preserve their gametes for future use with IVF, thus allowing the decisions about childbearing to be deferred and reproductive choices to be preserved. The research endeavor uses the capacity of the ovarian follicle to produce eggs in vitro. Developing the human follicle to ovulate successfully outside the body is scientifically difficult and ethically challenging. Infertility is linked to long-standing religious and moral traditions, and is intertwined with deeply contentious social narratives about women, families, illness and birth. Is the research morally permissible? Perhaps imperative if understood as a repair from iatrogenic harms? How are considerations of justice central to the work? How will vulnerable subjects be protected? What are the moral implications of the work for women, children and families? What are the implications for society if women could store ovarian tissue as a way of stopping the biological clock? What are the moral possibilities and challenges if eggs can be produced in large quantities from a stored ovarian tissue? (shrink)

Whether levonorgestrel taken as an emergency contraceptive has an abortifacient effect is a matter of great importance for Catholic bioethics. While many have argued that LNG-EC does not have a postovulatory effect, a recent literature review has convincingly established that inhibition of ovulation cannot account for all of the pregnancy reduction observed in clinical settings among those who take LNG-EC. This essay proposes a secondary mechanism of action of LNG-EC that is postovulatory but prefertilization; it argues that LNG-EC may (...) act in a contraceptive fashion by interfering with transport of the ovum to the site of fertilization in the timely fashion needed for reproductive success. While this mechanism of action cannot be established with the moral certitude required of these matters of life and death, further research may validate this mechanism beyond a reasonable doubt. National Catholic Bioethics Quarterly 14.2 : 235–244. (shrink)

As contribution to a recent debate (James, 1998; Murphy etal., 1997, 1998) the proportion of twins following ovulation induction (OI) or assisted conception (AC) in 1994 in Oxfordshire and West Berkshire was estimated, and by extrapolation the natural twinning rate in England and Wales was judged to have maintained a plateau phase since the 1970s. Similar figures for 1995 and 1996 from the same study, and hence a more stable local estimate, are now provided. The proportions, as before, were (...) estimated from women's responses to a questionnaire within a case[hyphen]control study, with ascertainment from general practitioners' records or hospital case[hyphen]notes for non[hyphen]responders or for those excluded from the study originally. In 1994, 1995 and 1996 the proportion of twins following OI/AC was overall 27% (24%, 30% and 27% respectively). Restriction to the 87% locally resident made no difference. The national crude twinning rate for those years was overall 13·3 per 1000 maternities (12·8, 13·6 and 13·4 respectively). (shrink)

How do women's sexual interests change across their ovulatory cycles? This question is one of the most enduring within the human evolutionary behavioral sciences. Yet definitive, agreed-upon answers remain elusive. One empirical pattern appears to be robust: Women experience greater levels of sexual desire and interest when conceptive during their cycles. But this pattern is not straightforward or self-explanatory. We lay out multiple possible, broad explanations for it. Based on selectionist reasoning, we argue that the conditions that give rise to (...) sexual interests during conceptive and non-conceptive phases are likely to differ. Because conceptive and non-conceptive sex have distinct functions, the sexual interests during conceptive and non-conceptive phases are likely to have different strategic ends. We discuss provisional evidence consistent with this perspective. But the exact nature of women's dual sexuality, if it exists, remains unclear. Additional empirical research is needed. But perhaps more crucially, this topic demands additional theory that fruitfully guides and interprets future empirical research. (shrink)

Male provisioning ability may have evolved as a “good dad” indicator through sexual selection, whereas male creativity may have evolved partly as a “good genes” indicator. If so, women near peak fertility (midcycle) should prefer creativity over wealth, especially in short-term mating. Forty-one normally cycling women read vignettes describing creative but poor men vs. uncreative but rich men. Women’s estimated fertility predicted their short-term (but not long-term) preference for creativity over wealth, in both their desirability ratings of individual men (r=.40, (...) p<.01) and their forced-choice decisions between men (r=.46, p<.01). These preliminary results are consistent with the view that creativity evolved at least partly as a good genes indicator through mate choice. (shrink)

Though better recognized for its immediate endeavors in human embryo research, the Carnegie Department of Embryology also employed a breeding colony of rhesus macaques for the purposes of studying human reproduction. This essay follows the course of the first enterprise in maintaining a primate colony for laboratory research and the overlapping scientific, social, and political circumstances that tolerated and cultivated the colony’s continued operation from 1925 until 1971. Despite a new-found priority for reproductive sciences in the United States, by the (...) early 1920s an unfertilized human ovum had not yet been seen and even the timing of ovulation remained unresolved. Progress would require an organized research approach that could extend beyond the limitations of working with scant and inherently restrictive human subjects or with common lab mammals like mice. In response, the Department of Embryology, under the Carnegie Institution of Washington, instituted a novel methodology using a particular primate species as a surrogate in studying normal human reproductive physiology. Over more than 40 years the monkey colony followed an unpremeditated trajectory that would contribute fundamentally to discoveries in human reproduction, early embryo development, reliable birth control methods, and to the establishment of the rhesus macaque as a common model organism. (shrink)

Oogenesis being performed in the ovary shows two different kinds of nuclei in the nursing cells. The above mentioned nuclei are transferred and incorporated into the nuclei of developing eggs, which become sexually differentiated and showWolanski's methyl-green reaction. The sex determination is, therefore, cytologically progamic and genotypical. The spawned eggs in the jelly strings appear first of identical shape and are all coated from the very beginning with grainy bonellian pigment, but afterwards, being reared in free water cultures in the (...) absence of females, they differentiate into distinctly different male and female larvae. The numerical ratio of the sexually differentiated larvae is discussed. The true chromosomes in gamogenesis as well as in somatic cells have not been found. L'oogénèse qui a lieu dans l'ovaire montre deux sortes de noyaux dans les cellules nourricières. Les noyaux mentionnés ci-dessus sont transportés dans les noyaux des ovules en voie de développement qui se différencient sexuellement et montrent la réaction deWolanski au vert de méthyle. Le déterminisme du sexe est, par conséquent progamique et génotypique, du point de vue cytologique. Les ovules déposés en gelée sont d'abord de forme identique et sont tous recouverts, dès le début, du pigment granulé de boneliéne, mais, élevés par la suite, dans des cultures en eau courante, en l'absence des femelles, ils se différencient distinctement en larves mâles et femelles. La proportion numérique des larves différenciées sexuellement est discutée. Dans la gamétogénèse, comme dans les cellules somatiques, les vrais chromosomes restent introuvables. Während der Oogenese, die sich im Eierstock abspielt, zeigen sich zwei differente Kerntypen in den Nährzellen. Diese Kerne werden allmählich in die Kerne des sich entwickelnden Eies übertragen und dort inkorporiert. Das Ei wird dadurch geschlechtlich differenziert und zeigt dann dieWolanski's Methyl-grün Reaktion. Die sexuelle Determination ist somit progam und genotypic. Die in schnurartigen Gallerten abgelegten Eier sind am Beginn von gleicher Form und Grösse, so wie von Anfang an mit Körnchen des Pigmentes Bonellein bekleidet. In freien Wasserkulturen,ohne Weibchen, entwickeln sie sich in deutlich differenzierte männliche und weibliche Larven. Das numerische Verhältniss der geschlechtlich differenten Larven wird diskutiert. Echte Chromosomen sind weder bei der Gamogenese noch in somatischen Zellen gefunden worden. (shrink)

We tested the good genes ovulatory shift hypothesis through speed-dating, an ecologically valid paradigm with real life consequences. Fifteen speed-dating sessions of 262 single Asian Americans were held. We analyzed 850 speed-dates involving 132 men and 100 normally ovulating women, finding ovulatory shifts in the desirability of men with more masculine facial measurements (smaller eye–mouth–eye angle, larger lower face to full face height ratio, and smaller facial width to lower face height ratio) in the predicted direction. However, there was no (...) support for ovulatory shifts in preferences for men’s self-reported height. In addition, the expected shifts were not found for women’s second date offers to men. Therefore, with natural stimuli and in a competitive dating scenario, we partially replicated previously documented ovulatory shifts in women’s preferences for men. (shrink)

Humanae vitae, ideología de género y futuro biotecnológico Humanae vitae, ideologia de gênero e futuro biotecnológico This short article aims to briefly comment on the influence of Humanae Vitae, fifty years after publication. In this context, some aspects related to the positive impact that Humanae Vitae lends to the affective environment of sexuality, both in adulthood and in the early ages of youth, are discussed given the influence of LGTBI ideology. The anthropological view of sexuality provides an environment of respect (...) for the dignity of the person in terms of the deviations that may occur due to the influence of gender ideology. Finally, some international scientific articles are cited, which positively demonstrate the possibility of making science compatible with the unitive and procreative nature of Humanae Vitae in a globalized environment. Para citar este artículo / To reference this article / Para citar este artigo Murcia-Lora JM. Humanae vitae, ideología de género y futuro biotecnológico. pers. bioét. 2018; 22: 358-366. DOI: 10.5294/pebi.2018.22.2.11. (shrink)

Though better recognized for its immediate endeavors in human embryo research, the Carnegie Department of Embryology also employed a breeding colony of rhesus macaques for the purposes of studying human reproduction. This essay follows the course of the first enterprise in maintaining a primate colony for laboratory research and the overlapping scientific, social, and political circumstances that tolerated and cultivated the colony's continued operation from 1925 until 1971. Despite a new-found priority for reproductive sciences in the United States, by the (...) early 1920s an unfertilized human ovum had not yet been seen and even the timing of ovulation remained unresolved. Progress would require an organized research approach that could extend beyond the limitations of working with scant and inherently restrictive human subjects or with common lab mammals like mice. In response, the Department of Embryology, under the Carnegie Institution of Washington (CIW), instituted a novel methodology using a particular primate species as a surrogate in studying normal human reproductive physiology. Over more than 40 years the monkey colony followed an unpremeditated trajectory that would contribute fundamentally to discoveries in human reproduction, early embryo development, reliable birth control methods, and to the establishment of the rhesus macaque as a common model organism. (shrink)