Name der Zeitschrift: Der Islam Jahrgang: 91 Heft: 1 Seiten: 1-5.

Ethylene (C2H4) is a gaseous plant hormone produced by higher and lower (green) plants and, when grown on appropriate substrates, also by fungi, yeasts and bacteria. Ethylene is involved in many developmental processes in plants and is biologically active in trace amounts (10 – 100 nl/I of air) that may be present in the outside air due to industrial air pollution(1). Fruit ripening and flower senescence especially, in a variety of commercially important crops, are dramatically stimulated by ethylene. Following characterization (...) of the genes coding for the key enzymes in ethylene biosynthesis, i.e. ACC synthase and ACC oxidase, it has become clear that their expression is regulated in a complex manner involving developmental, hormonal and tissue‐specific factors. This was recently very elegantly demonstrated for the expression of ACC oxidase genes in developing petunia flowers by Tang et al.(2). The spatial and temporal expression patterns, especially in the reproductive organs, suggest a hitherto unknown role for ethylene in reproductive processes such as the self‐incompatible response and the secretion of cellular exudate by the stigma and nectary. (shrink)

Contains the _Poetics _ and the first twelve chapters of the_ Rhetoric_, Book III.

Programmed cell death (PCD) is a process aimed at the removal of redundant, misplaced, or damaged cells and it is essential to the development and maintenance of multicellular organisms. In contrast to the relatively well‐described cell death pathway in animals, often referred to as apoptosis, mechanisms and regulation of plant PCD are still ill‐defined. Several morphological and biochemical similarities between apoptosis and plant PCD have been described, including DNA laddering, caspase‐like proteolytic activity, and cytochrome c release from mitochondria. Reactive oxygen (...) species (ROS) have emerged as important signals in the activation of plant PCD. In addition, several plant hormones may exert their respective effects on plant PCD through the regulation of ROS accumulation. The possible plant PCD regulators discussed in this review are integrated in a model that combines plant‐specific regulators with mechanisms functionally conserved between animals and plants. BioEssays 25:47–57, 2003. © 2002 Wiley Periodicals, Inc. (shrink)

More involvement of sub-Saharan African countries in biomedical studies, specifically in genetic research, is needed to advance individualized medicine that will benefit non-European populations. Missing infrastructure, cultural and religious beliefs as well as lack of understanding of research benefits can pose a challenge to recruitment. Here we describe recruitment efforts for a large genetic study requiring three-generation pedigrees within the Yoruba homelands of Nigeria. The aim of the study was to identify genes responsible for keloids, a wound healing disorder. We (...) also discuss ethical and logistical considerations that we encountered in preparation for this research endeavor. (shrink)

The Marine Biological Laboratory in Woods Hole, MA provided opportunities for women to conduct research in the late 19th and early 20th century at a time when many barriers existed to their pursuit of a scientific career. One woman who benefited from the welcoming environment at the MBL was Mary Jane Hogue. Her remarkable career as an experimental biologist spanned over 55 years. Hogue was born into a Quaker family in 1883 and received her undergraduate degree from Goucher College. She (...) went to Germany to obtain an advanced degree, and her research at the University of Würzburg with Theodor Boveri resulted in her Ph.D.. Although her research interests included experimental embryology, and the use of tissue culture to study a variety of cell types, she is considered foremost a protozoologist. Her extraordinary demonstration of chromidia in the life history of a new species of Flabellula associated with diseased oyster beds is as important as it is ignored. We discuss Hogue’s career path and her science to highlight the importance of an informal network of teachers, research advisors, and other women scientists at the MBL all of whom contributed to her success as a woman scientist. (shrink)

The necessary appearance of Clifford algebras in the quantum description of fermions has prompted us to re-examine the fundamental role played by the quaternion Clifford algebra, C 0,2 . This algebra is essentially the geometric algebra describing the rotational properties of space. Hidden within this algebra are symplectic structures with Heisenberg algebras at their core. This algebra also enables us to define a Poisson algebra of all homogeneous quadratic polynomials on a two-dimensional sub-space, $\mathbb{F}^{a}$ of the Euclidean three-space. This enables (...) us to construct a Poisson Clifford algebra, ℍ F , of a finite dimensional phase space which will carry the dynamics. The quantum dynamics appears as a realisation of ℍ F in terms of a Clifford algebra consisting of Hermitian operators. (shrink)

Two eleven-year-old boys face a bulletin board, arranging silver thumbtacks into shapes of fighter planes. They have arrived early for an after-school puppet workshop. Both boys are under five feet tall: the thin one sports a green terrycloth wristband and a big fro. “The girls like the poof,” he says. The other boy has a fuller body, a haircut similar to the Fab Four in the late sixties, and wears wide-leg jeans and a red t-shirt that brushes his kneecaps. The (...) boys talk while puncturing the corkboard with tacks. I like this game. It’s Star Miner. There’s this thing. It’s a ship that looks like this. The other ships are too detailed. You try and blow up a jet thingy, it spirals and can catch on .. (shrink)

Cassirer, E. Antropología filosófica.--Vecchio, G. del. El hombre y la naturaleza.--Jaspers, K. La pregunta acerca del hombre.--Marx, K. Existencia y conciencia.--Mounier, E. Las estructuras del universo personal.--Ortega y Gasset, J. Pasado y porvenir para el hombre actual.--Platón. Fedón.--Santayana, G. El nacimiento de la razón. Schaff, A. El marxismo y la filosofía del hombre.--Shorojova, E. V. Lo general humano y lo clasista en la concienia del hombre.--Spear, O. Animal rationale.--Spengler, O. El advenimiento del hombre. Wahl, J. Algunas observaciones acerca del hombre.

In numerous studies, experimental economists have documented the fact that people tend to propose that divisible goods be divided equally. It has often been proposed, most notably by the sociobiologists, that this tendency may have a biological basis, and might be the product of evolution and natural selection. ;My dissertation addresses methodological and philosophical problems that arise in the course of establishing this naturalistic claim. Specifically, the focus of this dissertation is on the project of using evolutionary game theory to (...) model the emergence of behavioral norms in a population. ;Chapter 1 briefly surveys the experimental economics literature that supports the existence of such behavioral propensities, and gives an overview of the dissertation. Chapter 2 introduces the fundamental concepts of game theory and evolutionary game theory. Chapter 3 argues that certain robustness failures may be overcome if group selection mechanisms are incorporated into the evolutionary models. Chapter 5 defends Peter Railton's causal theory of explanation, and argues that it best accommodates the dynamical models of evolutionary game theory. Chapter 6 addresses the question of whether a descriptive account of the origins of our moral intuitions is relevant to the normative project of identifying our moral obligations, and critiques arguments by Peter Singer and Peter Unger that our moral intuitions lack justification. (shrink)

Our senses are constantly stimulated in our daily lives but we have only a limited understanding of how they affect our cognitive processes and, especially, our autobiographical memory. Capitalizing on a public science event, we conducted the first empirical study that aimed to compare the relative influence of the five senses on the access, temporal distribution, and phenomenological characteristics of autobiographical memories in a sample of about 400 participants. We found that the access and the phenomenological features of memories varied (...) as a function of the type of sensory cues, but not their temporal distribution. With regard to their influence on autobiographical memory, an overlap between some senses was found, with on one hand, olfaction and taste and, on the other, vision, audition, and touch. We discuss these findings in the light of theories of perception, memory, and the self, and consider methodological implications of the sensory cuing technique in memory research, as well as clinical implications for research in psychopathological and neuropsychological populations. (shrink)

There are many prominent examples of artists with autism. However, even when confronted with evidence of these accomplished autistic savants, pragmatic aesthetic theories cannot adequately account for the work of these accomplished artists as artists. This article first examines the nature of autism and explores a prominent psychological theory that purports to explain autistic symptoms. This prominent theory, the theory of mind thesis, holds that autistic symptoms are the result of the failure of persons with autism to make certain types (...) of secondorder propositional attitude attributions. Second, the article describes the work of three visual artists with autism. There can be no doubt that these individuals are in fact artists. Third, the article examines pragmatic aesthetic theory and demonstrates why the pragmatic theory fails to adequately account for the accomplishment of autistic artists. The unique psychological deficits that characterize autism present a challenge to pragmatic aesthetic theories in particular. The conclusion is that the pragmatic theory’s inability to accommodate the artist autistic artist is a profound shortcoming. A revision of the pragmatic theory is called for, as is embracing of the development of the special talents of persons with autism. (shrink)

Dass "Wahrnehmung" sich historisch verändert, ist in den gegenwärtigen Debatten ebenso präsent wie die Einsicht, dass "Geschichte" selbst hochgradig wahrnehmungsabhängig ist. Die Autoren dieses Bandes erörtern die wechselseitigen Beziehungen von Wahrnehmung und Geschichte nicht allein theoretisch, sondern vorrangig materialbezogen - mit Blick auf konkrete Fallbeispiele. Das Spektrum der Beiträge reicht von der Erörterung der historischen Vermittlungsfunktion technischer Medien und verschiedener Künste bis zur Frage, welcher Logik Wahrnehmung und Vergessen der jüngsten und eigenen Geschichte unterliegen. Michel Foucault und Marshall McLuhan werden (...) als Vordenker einer solchen Aisthesis materialis, zu der hier "Markierungen" geliefert werden, begriffen. Beide kommen mit einem programmatischen Text auch selbst zu Wort. (shrink)

English summary: It seems that reason is less a universal principle than something inherently bound to the contexts in which it appears. These contributions to a conference held on the occasion of Christoph Schwobel's 60th birthday explore the character of reason's manifold contexts: the grounding of reason in the inner word of God 's Trinitarian life as well as the disclosure of reason and and its limits in human conversation. German description: Vernunft scheint in der Gegenwart weniger ein allgemeines Prinzip (...) als eine in Kontexte eingebundene Grosse zu sein. Die Beitrage einer Tagung anlasslich von Christoph Schwobels 60. Geburtstag, gehen der Frage nach dem Charakter dieser Kontextbindung nach: der Begrundung der Vernunft im trinitarischen Gesprach wie der Erschliessung und Problematisierung der Vernunft im menschlichen Gesprach. Mit Beitragen von V. Brummer, G. van den Brink, C. Drobe, H. J. Eckstein, D.-M. Grube, J. Halfwassen, S. Heine, F. Hermanni, E. Herms, W. Harle, W. Homolka, W. Jeanrond, R. W. Jenson, D. Kelsey, A. F. Koch, A. Kupsch, V. Leppin, P.-C. Lai, P. Lo, A. Min, J. Moltmann, M. Muhling, P. Peterson, M. Sarot, F. Schweitzer, A. Torrance, J. Webster, M. Welker, M. Wendte, M. Wisse, H. Wisskirchen und L. Zak. (shrink)

Introduction. Eating Disorders (EDs) are serious psychiatric disorders, impacting physical and psychosocial functioning, often with a chronic course and high mortality rates. The two continua model of mental health states that mental health is a complete state, that is not merely the absence of mental illness, but also the presence of mental health. This model was studied among ED patients by comparing the levels of well-being to the Dutch general population and by examining the of well-being and psychopathology. Method. A (...) total of 468 female ED patients participated in this study during application and intake at a specialized ED treatment centre in the Netherlands. They filled out questionnaires about well-being (MHC-SF), general psychopathology (OQ-45), and ED psychopathology (EDE-Q). Categorical and mean well-being levels were calculated. Also, the correlates of these variables were examined with Pearson correlation and multiple hierarchical regression analysis. Results. ED patients showed lower levels of emotional, psychological and social well-being on average compared to the general population. About 26% of the ED patients experienced low levels of well-being (languishing). However, also 13% experienced high levels of well-being (flourishing), varying between 9% in Anorexia Nervosa to 25% in Binge Eating Disorder. ED psychopathology and general well-being showed a moderate negative correlation. For patients with Bulimia Nervosa and Binge Eating Disorder however no such correlation was found. Lower general psychopathology, not having a history of hospitalization for the ED, and adaptive personal functioning were correlated with well-being among ED patients. Conclusion This study shows initial support for the two continua model of mental health among ED patients. Psychopathology and well-being should be considered as related, but distinct dimensions of mental health in ED patients. Further research should focus on the possible reciprocal relationships between psychopathology and well-being during recovery. It is recommended to monitor well-being during treatment and to implement interventions for well-being to realize complete recovery for those patients with inadequate levels of well-being. (shrink)

Francesco Petrarca, translated by H. Nachod: Introduction. A self-portrait. The ascent of Mont Ventoux. On his own ignorance and that of many others. A disapproval of an unreasonable use of the discipline of dialectic. An Averroist visits Petrarca. Petraca's aversion to Arab science. A request to take up the fight against Averroes.--Lorenzo Valla, translated by C.E. Trinkaus, Jr.: Introduction by C.E. Trinkaus, Jr. Dialogue on free will.--Marsilio Ficino, translated by J.L. Burroughs: Introduction, by J.L. Burroughs. Five questions concerning the mind.-- (...) Giovanni Pico della Mirandola, translated by E.L. Forbes Introduction, by P.O. Kristeller. Oration on the dignity of man.--Pietro Pomponazzi, translated by W.H. Hay. Introduction, by J.H. Randall. On the immortality of the soul.--Juan Luis Vives, translated by N. Lenkeith: Introduction, by N. Lenkeith. A fable about man.--Selective bibliography (p. 397-400). (shrink)

Erkenntnis und Irrtum. Skizzen zur Psychologie der Forschung. Von E. MACH Emer. Professor an der Unlversltlt Wlen. LEIPZIG Verlag von Johann Ambrosius Barth 1905. INTRODUCTION XIII On a number of occasions Mach expressed the sentiment, especially in his correspondence, that America was the land of intellectual freedom and opportunity, the coming frontier for a new radical empiricism that would help to wash metaphysics out of philosophy. In 1901 he sponsored the German edition of Concepts and Theories of Modern Physics (1881) (...) 2 by J. B. Stallo, Cincinnati lawyer and philosopher. Mach warmly endorsed Stallo's book because his scientific aims so closely approximated his own, and because Stallo rejected the latent metaphysical elements and concealed ontological assumptions of the mechanical-atomistic inter­ pretation of the world. The second edition of Wiirmelehre was dedicated to Stallo in 1900. The fourth edition of Populiir-wissenschaftliche Vorlesungen (1910), containing seven new essays, was dedicated to Harvard Professor of physiology, philosophY, and psychology, William James. Mach had a strong intellectual affinity for James' pragmatism because, like himself, he recognized that James had come to radically empirical views from science. Both men took pure pre-conceptualized experience, from which the mental and physical predicates of experience are composed, to be neutral rather than real, unreal, objective or subjective. (shrink)