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1168 results found.
117 pages of results.
101. Why Cancer? [Science Frontiers Website]
... 24: Nov-Dec 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Why cancer? "However, the most formidable obstacle to the successful treatment of disseminated cancer may well be the fact that the cells of a tumor are biologically heterogeneous. This phenotypic diversity, which allows selected variants to develop from the primary tumor, means not only that primary tumors and metastases can differ in their responses to treatment but also that individual metastases differ from one another. This diversity can be generated rapidly even ... the tumors originate from a single transformed cell." (Fidler, Isaiah J., and Hart, Ian R.; "Biological Diversity in Metastatic Neoplasma: Origins and Implications," Science, 217:998, 1982.) Comment. The ability of single cancer cells to multiply into different kinds of cells, as well as propagate throughout an organism, seems to betoken an insidious biological entity, whose origin and purpose (?) we have hardly begun to comprehend. How could cancer have evolved if it leaves no ...
102. Leonardo da Vinci: Rocks, Fossils, and Time [Kronos $]
... about him and their far-reaching implications; his own magnificent landscapes attest to his love for physical nature. To Leonardo, the rock strata with their fossils suggested a story considerably different from the interpretations given by most thinkers in antiquity. (Although he was the father of biology and made contributions to taxonomy and embryology, Aristotle himself had held to the eternal fixity of all terrestrial plant and animal forms or species (including man) within the hierarchical Great Chain of Being. It was a very secure world.) Since marine fossils of ... religious interpretations of creation and destruction. To account for the marine objects at the tops of hills and high mountains far removed from the sea, his mind leaped ahead of contemporary thought to embrace conceptions of both geological catastrophism and uniformitarianism as well as anticipating the theory of biological evolution (ideas that are still hard for some thinkers to accept even today). In the layers of mountain stone, Leonardo da Vinci studied the fossilised evidence: various marine shells, sea snails, oysters, corals, scallops, cockles, crabs, cuttlefish ...
103. THE WATCHMAKER IS NOT BLIND AFTER ALL! [Science Frontiers Website]
... commentary accompanying the two Science papers, highlights a significant feature of adaptive mutation in bacteria: The genetic changes involved are multicellular. In other words, DNA rearrangements in one cell are actually transferred to other cells. But most profound of all for the whole science of biology is his sentence: "The discovery that cells use biochemical systems to change their DNA in response to physiological inputs moves mutation beyond the realm of 'blind' stochastic events and provides a mechanistic basis for understanding how biological requirements can feed back onto genome structure." ... Jul-Aug 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The watchmaker is not blind after all! Neo-Darwinists are chained to the premise that evolution proceeds "blindly"; that is, mutations are random and unrelated to the biological needs for survival. This assumption is enshrined in R. Dawkins' book The Blind Watchmaker. Catchy though this title is, it looks more and more like the Watchmaker sees something. For over a decade, experiments have hinted that those mutations that are helpful ...
104. Science Frontiers [SIS C&C Review $]
... and it is difficult to conceive of life without organic molecules. At first, most scientists preferred to explain the ambiguous life-detectlon experiments in terms of strange extraterrestrial chemistry. Nevertheless, strange extraterrestrial life would explain the data equally well. Everyone should be aware that the Viking biology team still considers life on Mars as a real possibility. [Most investigations of extraterrestrial life, whether theoretical or analytical, assume "life-as-we-know-it." Ed.( Lewis Richard; "Yes, There Is Life on Mars," New Scientist, 80: ... than for earth and Mars. (Anonymous; "Venus Probes Solar System Birth," New Scientist, 80:916, 1978.) UNEARTHLY LIFE ON MARS From the media standpoint--- and therefore that of most people--- the Viking Martian biological experiments were uncompromisingly negative. Lewis points out that this is simply not so. The labelled-release experiments on both landers produced positive results every time a nutrient was added to fresh Martian soil. (The nutrient was tagged with carbon-14 and radioactive carbon dioxide always evolved, ...
105. Surprised! [SIS Internet Digest $]
... 568 54 10% ## ## ## ## ## historians 162,920 14,702 9% ## ## ## ### meteorologists 13,288 1,222 9% ## ## ## ### biologists 57,180 4,289 8% ## ## ## ## mathematicians 68,629 5,792 8% ## ## ## ## archaeologists 56,920 4,276 8% ## ## ## # ... 1: The names of some types of scientist, plus a generic "scientist" and a gratuitous "reporter". Column 2: Using the AltaVista search engine, the number of pages found containing the word "scientist". For example, the word "biologist" was found on 57,180 pages. Note that the word might occur more than once on the page. Coluimn 3: The number of pages the word "surprised" (but not "not surprised") was found on the same pages as ...
106. Life As A Cosmic Phenomenon [Science Frontiers Website]
... 48: Nov-Dec 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Life As A Cosmic Phenomenon "The arguments in support of life as a cosmic phenomenon are not readily accepted by a culture in which a geocentric theory of biology is seen as the norm." The quotation above heads a revealing discussion by F. Hoyle and N.C. Wickramasinghe as to why their conclusions about cosmic life have not been accepted by the scientific community. Stimulating this article was a statement by J. Maddox ... of SF and see no need to cover the same ground again. Rather, we wish to dwell on the scientific reception of their work. We do this with two quotations from their Nature article. These quotations are embedded in their review of the infrared evidence for biological material in outer space: "Still persuing the infrared problem, we eventually found that among organic materials polysaccharides gave the best correspondence to the astronomical data, and it was exactly at this point in our work that we began to experience hostility from the referees of ...
107. Heretical Evolutionary Theory [Science Frontiers Website]
... modern experimental evidence has it become acceptable to many biologists. If the hypothesis is correct, then virtually all the major groups of familiar organisms originated 'suddenly' through endosymbiotic associations." Following this lead paragraph, with its paradigm-shaking final sentence, are three pages summarizing the biological evidence favoring evolution by endosymbiosis. (Kite, Geoffrey; "Evolution by Symbiosis; The Inside Story," New Scientist, p. 50, July 3, 1986.) Comment. We cannot possibly do justice to this exciting idea of evolution forced by ... Science Frontiers ONLINE No. 47: Sep-Oct 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Heretical Evolutionary Theory "Over the past 15 years, away from the limelight of mainstream evolutionary argument, cell biologists have been debating a concept that is fundamental to our understanding of how cells evolved. It is the proposal that some of the structures that are found in the larger cells of animals, plants and fungi (eukaryotic cells) are the descendants of simpler bacteria-like organisms (prokaryotic cells ...
108. Chapter 1 [Alternative Science Website]
... and the evolution of all creatures including humankind. It is the only theory of evolution taught in schools, colleges, and universities. It is presented as fact in museum displays, lectures, and publications. A few controversial points are referred to in museum publications and biology textbooks, but these are viewed as peripheral controversies, whose outcome cannot alter the basic truth revealed by neo-Darwinism. The synthetic theory is universally taken as having been confirmed in all its main essentials- only a few isolated details remaining to be tidied up by specialists ... in wonder at its contents. But I have been unable to see with my own eyes the decisive evidence for the general theory of evolution. I have been able to see many marvels and to study mountains of evidence: the Geological Column that reconstructs the geological and biological history of the Earth; the dinosaur skeletons and myriad other fossils; marvels like the skeleton of Archaeopteryx, seemingly half bird, half reptile; the reconstructed evolution of the horse family. But unlike its counterpart at Teddington, the museum is unable to exhibit the ...
109. Punctuated Darwinism? [SIS C&C Workshop $]
... behaviour to new ecological niches. Natural selection as perceived by the neo-Darwinians would be far too slow a process, and, as has been indicated above, can be seen as a negative force, not the creative one necessary in such extreme circumstances. New ideas in biology which tie in with the creative cosmos of the physicists, provide a possible alternative answer. The hypothesis of formative causation [7 suggests that living organisms are not the purely mechanistic units envisaged by neo-Darwinians, but are creatively adaptive. Furthermore, the more a particular ... possible genetic variability within the various captive species. It is estimated that to start with 90% of a species' variation a breeding population must start with at least six individuals taken at random from the wild. However, there is then a time problem. Conservation biologists are taking very seriously the idea that there is little point in returning animals to the wild until the human population has levelled out and learned to preserve what, if any, remains of the natural world. On an optimistic assessment this will be at least another ...
110. Preface [Alternative Science Website]
... 'harmless fruitcake' who, 'needs psychiatric help.' 2 When Shattering the Myths of Darwinism was published, I expected it to arouse controversy, because it reports on scientific research that is itself controversial and because it deals with Darwinism- always a touchy subject with the biology establishment. I didn't expect science to welcome an inquisitive reporter, but I did expect the controversy to be conducted at a rational level, that people would rightly demand to inspect my evidence more closely and question me on the correctness of this or that fact. ... have to be? In what forum, or by what mechanism, can the voices of dissent ever be heard in science? It is not just outsiders who cannot be heard, it is dissenting members of the scientific professions themselves. In my mailbox are letters from biologists who are concerned at the teaching of Darwinism as holy writ and from medical men whose practice has led them to make medical discoveries having a bearing on evolutionary biology. They have sought to publicize these discoveries in journals such as Nature but have been universally rejected because ...
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