The construction of theoretical models in biology, situated at the cross-roads of biology, mathematics and computer science, often leads to a tool as final product. Its genesis can be named Infogenesis. The procedure of the resolution of theoretical problems is analyzed on examples of practical purposes taken from plant biology.The first example deals with mineral plant nutrition, explaining a way to go from theoretical ionic balances to the experimental realization of nutritional solutions with macro-element components.

The paper shows that, contrary to what has been held since the sixteenth-century mathematician Christoph Clavius, there is no application of consequentia mirabilis (CM) in Greek mathematical works. This is shown by means of a detailed discussion of the logical structure of the proofs where CM is allegedly employed. The point is further enlarged to a critical assessment of the unsound methodology applied by many interpreters in seeking for specific logical rules at work in ancient mathematical texts.

Dans toutes les sciences, même en physique, la réflexion sur les expériences, les concepts et les explications oblige à repenser l'opposition de la nature et de l'esprit. C'est en raison de cela que la psychologie s'est vue contrainte de revoir la conception traditionelle concernant la relation de l'âme et du corps. Le corps est un système d'équilibres intérieurs qui ont une signification et qui, dans le courant de l'existence sont formés, entretenus, troublés et rétablis. En tout cela motivations psychologiques et (...) occasions corporelles sont intimement mêlées. Ceci est illustré par deux exemples, la conservation de la constance de la température du corps et de l'état de nutrition. La stabilité du « milieu interne » , C. à. d. l'homéostase, est la condition de l'indépendance individuelle de l'animal, et elle est le point d'appui de la liberté personnelle de l'homme. La régulation thermique est le fait de fonctions physiologiques qui s'exercent en accord avec l'existence personnelle. Cette liaison de l'existence et de la vie s'explique par le fait que, corporellement, l'homme ne réagit pas à des excitants physiques, mais à leur signification humaine. La régulation thermique dépend de la sensation de froid et de chaud et par conséquent aussi de relations et d'habitudes humaines. Le second exemple, de l'homéostase, de la conservation d'un état constant de nutrition, démontre, tout comme la régulation thermique, l'unité d'un état physiologique et du corps comme situation vécue. Ceci nous est montré par l'exemple de l'appétit qui dépend sans dute de sensations corporelles et d'équilibres intérieurs, mais tout autant des relations affectives. Le manque d'appétit, l'anorexie nerveuse, comme on l'appelle, se produit souvent d'une manière symptomatique dans les périodes critiques de l'existence, p. ex. à la puberté, au climacterium et à l'occasion de conflits psychiques. Il y a alors une disproportion entre le vouloir et le pouvoir que le psychologue ne peut comprendre que par rapport à la corporéité animée et animante, c'est à dire par le fait que la corporéité déjà organisée entre en conflit avec la corporéité organisante qui est constituée et par la motivation de la situation et par la liberté relative de l'homme qui donne à cette situation un sens déterminé. L'existence et la vie sont deux aspects de la réalité humaine, aspects qui sont susceptibles d'être analysés et auxquels le psychologue doit accorder son attention. La personne concrète est une unité de nécessité et de liberté, de nature et d'esprit, qui se forme elle-même dans sa vivante existence. (shrink)

The use of human fetal tissue for scientific research has enormous potential but is subject to government legislation. In the United Kingdom the Polkinghorne Committee's guidelines were accepted by the Department of Health in 1990. These guidelines set out to protect women undergoing termination of pregnancy from exploitation but in so doing may significantly restrict potential research. Although the committee took evidence from a wide variety of experts they did not seek the views of the general public. We asked 108 (...) women about to have a therapeutic abortion; 167 women who had had a pregnancy terminated in the past, and 419 women who had never had an abortion, their views on research using human fetal tissue. Regardless of their past experiences the women were overwhelmingly in favour of research using fetal tissue (94 per cent). They made little distinction between basic research and research with obvious clinical relevance and supported the concept of using transplanted fetal tissue for the treatment of adult disease such as Parkinsonism. Women about to undergo an abortion were significantly more likely (p < 0.001) to approve of all types of research including that aimed at improving methods of abortion and research using live fetuses in utero. (shrink)

The Tree of Nature represents an IT-based approach to understanding Nature in the light of present-day scientific knowledge. The universe, in this view, consists of discrete entities; these are not material particles, however, but information processing events that produce observable changes in the world. The surprising result of this analysis is that the workings of Nature are based on a decision tree consisting of two dozen parameters. The tree is similar to the evolutionary phylogenetic system of the various forms of (...) life, but it is far more fundamental; constituting, as it does, the very base of everything that exists. The overall conclusion is that the universe is steadily producing new information. Metaphorically speaking, it constitutes a self-unfolding story in which events do not pass away into non-existence but instead remain forever as an indelible part of the whole. This also holds true for integrated sets of events, such as the lifetime experiences of an individual. The Tree of Nature leads to the following testable prediction: A successful quantum-gravity theory will involve the notion of a strong complementarity between gravity and the strong nuclear force. (shrink)

The bear, says Hierocles, is aware that its head is easily injured, and instinctively uses its paws as a protection. The three following lines in the papyrus are badly damaged– καν εί π.ε … δεηθεί Του | βαλανεíον κρημν | πáλιν ύ;β εθεíησιν ε | αυΤήν. This is followed by a description of what the bear does when it is pursued and comes to a precipice. It inflates itself and trusts to the inflation to break its fall. It is hardly (...) possible to restore the damaged lines. Von Arnim thinks that the sense required is: ‘wenn die Bärin, vom Jäger verfolgt, eines Bades bedarf oder auf ihrer Flucht an einen Abgrund kommt,πáλιν ύπ èψίησιν εαψτήν’ But a sensible bear would hardly think of taking a bath when pursued by the hunter. It might take to the water; but the Greek for this would be somewhat different. As I read the passage, there is no reference to the bear as pursued by the hunter till line 34, where I would read πоιεî δè τò τοιóνδε , since the phrase εί δ υν διοκμéνμ in line 38 is resumptive, and implies that the pursuit must have been alluded to before. But before line 35 H. is only describing what the bear does to protect its head in the ordinary routine of its life when it is not harassed by the hunter. It wants a bath, and finds that it cannot reach the water without clambering down an overhanging bank It will not climb down head foremost, but guards its head by sliding backwards down the bank. As the bear would want its bath because it was hot, it is perhaps not too hazardous to conjecture that some phrase such as xs03F0xs2135ν ει π ε<ζομéν πνíγηι δεμθεíν του β. should find its place in line 31. (shrink)