The T lymphocyte receptor for antigen, which operates in conjunction with gene products of the major histocompatibility complex (MHC), is a molecular complex comprised of five polypeptide chains. Both the 49 kDa alpha and 43 kDa beta chains are immunoglobulin‐like and thus contain variable domains responsible for ligand binding. In contrast, the 20–25 kDa T3 gamma, delta and epsilon chains are monomorphic structures presumably involved in transmembrane signalling. The alpha and beta subunits are disulfide bonded to each other and held (...) in noncovalent association with the T3 chains. T3‐Ti receptor crosslinking leads to conformational modification of a second T lineage specific molecule, termed the 50 kDa T11 structure which in turn leads to protein kinase C activation, elevation in intracytoplasmic free calcium and Na+/H+ antiport stimulation. (shrink)

The current paper synthesizes theory and data from the field of life history (LH) evolution to advance a new developmental theory of variation in human LH strategies. The theory posits that clusters of correlated LH traits (e.g., timing of puberty, age at sexual debut and first birth, parental investment strategies) lie on a slow-to-fast continuum; that harshness (externally caused levels of morbidity-mortality) and unpredictability (spatial-temporal variation in harshness) are the most fundamental environmental influences on the evolution and development of LH (...) strategies; and that these influences depend on population densities and related levels of intraspecific competition and resource scarcity, on age schedules of mortality, on the sensitivity of morbidity-mortality to the organism’s resource-allocation decisions, and on the extent to which environmental fluctuations affect individuals versus populations over short versus long timescales. These interrelated factors operate at evolutionary and developmental levels and should be distinguished because they exert distinctive effects on LH traits and are hierarchically operative in terms of primacy of influence. Although converging lines of evidence support core assumptions of the theory, many questions remain unanswered. This review demonstrates the value of applying a multilevel evolutionary-developmental approach to the analysis of a central feature of human phenotypic variation: LH strategy. (shrink)

Hospitals long ago shed their role as alms houses for the poor. What vestiges remain of the early American hospital are the tax-exempt, nonprofit hospital form and a general perception that hospitals, as charitable institutions, owe a duty to their communities. The appropriateness of the nonprofit hospital tax exemption has long been debated, and many theories have been advanced to justify the tax exemption of nonprofit hospitals. In a growing number of jurisdictions, however, state and local authorities have gone beyond (...) the theoretical debate and are challenging the tax exemption of their nonprofit hospitals. For various reasons, efforts are afoot to capture greater community benefit from nonprofit hospitals.At the heart of such challenges is the debate over the nature and extent of the duty charitable institutions owe to their communities. A demand is growing for nonprofit hospitals to earn their tax exemptions by benefiting their communities in concrete ways. Some have been stripped of their tax-exempt status by local authorities or pressured to make payments in lieu of taxes. A number of states have recently implemented initiatives in an attempt to make hospitals more accountable for their community benefits. Many hospitals are responding to this heightened scrutiny in a proactive way, by voluntarily documenting community benefits. A number of nonprofit hospitals and hospital associations are cooperating with—or even sponsoring—state legislation in this area. (shrink)

Hospitals long ago shed their role as alms houses for the poor. What vestiges remain of the early American hospital are the tax-exempt, nonprofit hospital form and a general perception that hospitals, as charitable institutions, owe a duty to their communities. The appropriateness of the nonprofit hospital tax exemption has long been debated, and many theories have been advanced to justify the tax exemption of nonprofit hospitals. In a growing number of jurisdictions, however, state and local authorities have gone beyond (...) the theoretical debate and are challenging the tax exemption of their nonprofit hospitals. For various reasons, efforts are afoot to capture greater community benefit from nonprofit hospitals.At the heart of such challenges is the debate over the nature and extent of the duty charitable institutions owe to their communities. A demand is growing for nonprofit hospitals to earn their tax exemptions by benefiting their communities in concrete ways. Some have been stripped of their tax-exempt status by local authorities or pressured to make payments in lieu of taxes. A number of states have recently implemented initiatives in an attempt to make hospitals more accountable for their community benefits. Many hospitals are responding to this heightened scrutiny in a proactive way, by voluntarily documenting community benefits. A number of nonprofit hospitals and hospital associations are cooperating with—or even sponsoring—state legislation in this area. (shrink)

Initial responses to questionnaires used to assess participants' understanding of informed consent for malaria vaccine trials conducted in the United States and Mali were tallied. Total scores were analyzed by age, sex, literacy (if known), and location. Ninety-two percent (92%) of answers by United States participants and 85% of answers by Malian participants were correct. Questions more likely to be answered incorrectly in Mali related to risk, and to the type of vaccine. For adult participants, independent predictors of higher scores (...) were younger age and female sex in the United States, and male sex in Mali. Scores in the United States were higher than in Mali (P = 0.005). Despite this difference participants at both sites were well informed overall. Although interpretation must be qualified because questionnaires were not intended as research tools and were not standardized among sites, these results do not support concerns about systematic low understanding among research participants in developing versus developed countries. (shrink)

The is the Editorial of the 2015 JPBMB Special Issue on Integral Biomathics: Life Sciences, Mathematics and Phenomenological Philosophy.

This is the editorial to the special edition of Progress in Biophysics and Molecular Biology on the role engagement with Eastern traditions of thought could play in the advancement of science generally and biology and the science of mind in particular.

The Istituto e Museo di Storia della Scienza, Florence, Italy, possesses an astrolabe with five latitude plates that is now attributed to the Duisburg workshop of Gerard Mercator. Although it is known that Mercator made instruments, this is the first surviving example to be identified. Another latitude plate is shown to come from the workshop of the Florentine, Giovan Battista Giusti. A seventh plate, possibly engraved by Rumold Mercator, provides the only known Mercatorian polar stereographic projection. The role of Egnazio (...) Danti, cosmographer to the Grand Duke of Tuscany, in the acquisition of the astrolabe in about 1570 is considered. (shrink)

American undergraduates rated masculinity, femininity, and likability of two men from a videotaped interaction. Participants were informed that both men were cat persons, dog persons, heterosexual, adopted, or gay, or were unlabeled. Participants rated the men less masculine when cat persons than when dog persons or unlabeled, and less masculine and more feminine when gay than when anything else or unlabeled. The more masculine man received lower feminine ratings when a dog person than when a heterosexual, and higher masculine ratings (...) when a dog person than when unlabeled. Labels did not affect likability. Overall, the gay label consistently promoted cross-gender attributions, the dog person label encouraged somewhat heightened gender-appropriate attributions, and the cat person label allowed for normative attributions. (shrink)

SummaryMalaria is a major cause of under-five mortality in Mali and many other developing countries. Malaria control programmes rely on households to identify sick children and either care for them in the home or seek treatment at a health facility in the case of severe illness. This study examines the involvement of mothers and other household members in identifying and treating severely ill children through case studies of 25 rural Malian households. A wide range of intra-household responses to severe illness (...) were observed among household members, both exemplifying and contravening stated social norms about household roles. Given their close contact with children, mothers were frequently the first to identify illness symptoms. However, decisions about care-seeking were often taken by fathers and senior members of the household. As stewards of the family resources, fathers usually paid for care and thus significantly determined when and where treatment was sought. Grandparents were frequently involved in diagnosing illnesses and directing care towards traditional healers or health facilities. Relationships between household members during the illness episode were found to vary from highly collaborative to highly conflictive, with critical effects on how quickly and from where treatment for sick children was sought. These findings have implications for the design and targeting of malaria and child survival programming in the greater West African region. (shrink)

PurposeThis study investigated whether the ability to utilize statistical regularities from fluent speech and map potential words to meaning at 18-months predicts vocabulary at 18- and again at 24-months.MethodEighteen-month-olds were exposed to an artificial language with statistical regularities within the speech stream, then participated in an object-label learning task. Learning was measured using a modified looking-while-listening eye-tracking design. Parents completed vocabulary questionnaires when their child was 18-and 24-months old.ResultsAbility to learn the object-label pairing for words after exposure to the artificial (...) language predicted productive vocabulary at 24-months and amount of vocabulary change from 18- to 24 months, independent of non-verbal cognitive ability, socio-economic status and/or object-label association performance.ConclusionEighteen-month-olds’ ability to use statistical information derived from fluent speech to identify words within the stream of speech and then to map the “words” to meaning directly predicts vocabulary size at 24-months and vocabulary change from 18 to 24 months. The findings support the hypothesis that statistical word segmentation is one of the important aspects of word learning and vocabulary acquisition in toddlers. (shrink)

Current UK legislation is impacting upon the feasibility and cost-effectiveness of medical record-based research aimed at benefiting the NHS and the public heath. Whereas previous commentators have focused on the Data Protection Act 1998, the Health and Social Care Act 2001 is the key legislation for public health researchers wishing to access medical records without written consent. The Act requires researchers to apply to the Patient Information Advisory Group for permission to access medical records without written permission. We present a (...) case study of the work required to obtain the necessary permissions from PIAG in order to conduct a large scale public health research project. In our experience it took eight months to receive permission to access basic identifying information on individuals registered at general practices, and a decision on whether we could access clinical information in medical records without consent took 18 months. Such delays pose near insurmountable difficulties to grant funded research, and in our case £560 000 of public and charitable money was spent on research staff while a large part of their work was prohibited until the third year of a three year grant. We conclude by arguing that many of the current problems could be avoided by returning PIAG’s responsibilities to research ethics committees, and by allowing “opt-out” consent for many public health research projects. (shrink)