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  • Articles  (29,319)
  • Nature Publishing Group  (29,319)
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  • 1990-1994  (17,787)
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  • Physics  (29,319)
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  • 1
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    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 10-10 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - A recent leading article in Nature (371, 90; 1994) comments on drug testing of athletes. It points out that positive results from tests on well-known athletes are invariably made public, and asks why negative results are not also made public so that the prevalence of drug-taking by athletes ...
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  • 2
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    Nature 372 (1994), S. 13-14 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IF the following pages are an attempt to describe the present state of science, they may nevertheless define the areas of our present ignorance, much in the way that a mould in a foundry will define the shape of the object to be cast in it - by exclu-sion, as it were. But what follows immedi-ately ...
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  • 3
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    Nature 372 (1994), S. 15-16 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FOR three decades, the Big Bang Universe has been the generally accepted model of how the world we know came into being: between 10 and 20 billion years ago, everything sprang into being out of nothing. The impulse of that event has kept the Universe expanding ever since. As theories go, the ...
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  • 4
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    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 20-20 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE outcome of the formative period of particle physics is familiar. Matter is made of quarks and leptons. Hadrons. Combinations of quarks make hadrons, which are either baryons (which, like electrons, have half-integer spin) or mesons (whose spin is either zero or inte-gral). There are six quarks, ...
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  • 5
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    Nature 372 (1994), S. 20-21 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE great neutrino puzzle has dragged on for a quarter of a century, and is not yet in sight of resolution. The presenting symp-tom is the deficit of neutrinos emitted by the Sun, first measured by R. Davies Jr by means of an experiment first planned 30 years ago1 and designed to provide direct ...
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  • 6
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    Nature 372 (1994), S. 23-23 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Higgs boson, not yet discovered, is arguably the most important of all parti-cles in contemporary particle physics. To the extent that it is an indispensable part of the electroweak theory of the electro-magnetic and the weak nuclear forces, the theory will not be properly tested until the ...
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  • 7
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    Nature 372 (1994), S. 25-26 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is puzzling now to be reminded that the Lowell Observatory at Flagstaff in Arizona was founded exactly a century ago because of the enthusiasm of Perc-ival Lowell for the study of Mars and of its presumed inhabitants. But that is simply a measure of the degree to which observation of the Solar ...
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  • 8
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    Nature 372 (1994), S. 32-32 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WHATEVER the uncertainties remaining about the course of evolution of the aus-tralopithecines, the question of where their ancestors came from and what they were like is even more obscure. Techni-cally, they are known as hominoids. As a group, they include the great apes and human beings (the ...
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  • 9
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    Nature 372 (1994), S. 32-32 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN 10,000 generations or thereabouts, human beings have migrated from Africa to populate almost the entire surface of the Earth. It is known that there were people in Australia 50,000 years ago, and that the Americas were occupied less than 25,000 years ago by land migration from Asia. But there ...
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  • 10
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    Nature 372 (1994), S. 36-36 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Electron micrograph of a single mitochondrion from a human pancreas cell, showing the cristae (internal folds of the inner membrane) at which respiration occurs. Also visi-ble is the endoplasmic reticulum within the mitochondrion, carrying bead-like ribosomes (for protein synthesis). Mito-chondria ...
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  • 11
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    Nature 372 (1994), S. 709-709 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nature 363, 644-648 (1993) THE following correction concerns only the contribution to this paper of E.M., R.G. and E. Schafer. We purified a protein of MT 60,000 (60K) from oat seedlings that possesses an oligomeric structure of 600K and is partially similar to the cytosolic TCP1 proteins from ...
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  • 12
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    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 710-710 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nature 372, 467-470 (1994) DURING production a stray line was introduced across panel c of Fig. 4 of this Letter. The figure is reproduced ...
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  • 13
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    Nature 372 (1994), S. 710-710 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nature 372, 186-190(1994) THE contents list in this (the 10 November) issue included a typographical ...
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  • 14
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    Nature 372 (1994), S. 42-43 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FROM a narrowly economic viewpoint, the best long-term harvesting strategy for biological populations with relatively low growth rates is to liquidate the stock. That conclusion, which assumes discounts on future returns, is based mainly on analyses involving a deterministic world. But real ...
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  • 15
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    Nature 372 (1994), S. 49-49 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR- Oliver Goodenough and Richard Dawkins (Nature 371, 23-24; 1994) have overlooked the fact that prior exposure to an appropriate mind virus may be a pre-requisite for susceptibility to infection by another mind virus. They themselves report the "experi-encing of waves of mild, irrational ...
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  • 16
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    Nature 372 (1994), S. 50-50 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Kurihara et al.1, in their paper on the production of mice deficient for the gene for endothelin-1 (ET-1), report one result of great interest to those in the field of human hypertension. In their hetero-zygote ET-l+' mice, reductions in plasma and lung tissue levels of the mature ...
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  • 17
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    Nature 372 (1994), S. 53-54 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DEVELOPMENTAL theories are going dynamic. Psychologists no longer think of nature and nurture in terms of a dichot-omy. But until recently there were few alternatives to the biologically implausible dissociation of cognition into 'innate' and 'acquired' components. Two recent approaches - ...
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  • 18
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    Nature 372 (1994), S. 55-63 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recent advances have uncovered the general protein apparatus used by all eukaryotes for intracellular transport, including secretion and endocytosis, and for triggered exocytosis of hormones and neurotransmitters. Membranes are shaped into vesicles by cytoplasmic coats which then dissociate upon ...
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  • 19
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    Nature 372 (1994), S. 38-38 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ON a clear, dark, moonless summer (or winter) night, look at the sky around midnight. You will see myriads of stars pasted on the dome of the sky, bisected by a fuzzy arc that is an amalgam of dark and light diffuse patches. This arc was called the 'Milky Way' by the Greeks. We know today that the ...
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  • 20
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    Nature 372 (1994), S. 45-46 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] INHERITANCE of the E4 allele of the gene encoding apolipoprotein E (APOE) is one of the main risk factors for late-onset Alzheimer's disease. Dozens of studies have confirmed the original finding, but the mechanisms underlying the link are not yet clear. On page 92 of this issue1, Ma et al. report ...
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  • 21
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    Nature 372 (1994), S. 46-46 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AN Indian city recently acquired an expensive Western waste-utilization plant, a furnace intended to power generators. It never worked. The diligent rubbish-sorters of the city scoured the rubbish as it came in, removing everything of even trivial value. What they left behind, mainly rotting ...
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  • 22
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    Nature 372 (1994), S. 49-49 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - New evidence suggests that a stan-dardized measure of weight was used in the prehispanic Andes. Small, prehispanic beam balances have been found through-out the area1"5, but were thought to have been used with internally consistent unique weight sets to measure propor-tions only. No ...
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  • 23
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    Nature 372 (1994), S. 51-52 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BETWEEN 1934 and 1961, A. J. Toynbee published a 12-volume review of the rise and fall of civilizations entitled! Study of History. Professor Cohen's lesser, but still massive, book might have been entitled A Study of the History of Science, for it ranges over the rise and fall of the sciences from ...
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  • 24
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    Nature 371 (1994), S. 728-728 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] London. The European Commission (EC) in Brussels last week suggested to the 12 member states of the European Union (EU) that joint research programmes involving some -but not all-members should for the first time be included within the commission's five-year 'framework' ...
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    Nature 371 (1994), S. 728-728 
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    Source: Nature Archives 1869 - 2009
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    Notes: [Auszug] Paris. Edith Cresson (right), the former French socialist prime minister, is being tipped to succeed Antonio Ruberti as the European Union (EU)'s research commissioner when he steps down at the end of the year. According to unconfirmed reports, Cresson and Jacques Santer, the new president of ...
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  • 26
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    Nature 371 (1994), S. 730-730 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Paris. The European Space Agency (ESA) has agreed to extend the operation of its remote-sensing satellite ERS-1 to the end of 1995 instead of shutting it down at the end of this year. The decision follows protests from scientists that shutting down ERS-1 in December would throw away an opportunity ...
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  • 27
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    Nature 372 (1994), S. 494-494 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - It is surprising that your leading article about the Royal Commission's report on transport and the environment, "The motor-car as black sheep" (Nature 372, 115-116; 1994), concerns itself with the politics of transport to the virtual exclusion of scientific and technological ...
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  • 28
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    Nature 371 (1994), S. 732-732 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] San Francisco. The US Office of Naval Research (ONR) has dropped charges of fraud and wrongdoing against Stanford University in California after the university agreed last week to pay the US government $ 1.2 million to settle a four-year-old dispute over its billing of indirect costs for government ...
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  • 29
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    Nature 372 (1994), S. 495-496 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN Rwanda, the end of colonialization in 1959 coincided with a Hutu takeover and the abolition of the monarchy. Following this, the Tutsi were subject to years of revenge: arbitrary treatment, torture, confiscation of possessions and killings. In March and April 1962, more than 2,000 ...
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    Nature 372 (1994), S. 497-497 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] READERS of Nature will have noted several papers about the ecology of Scandinavian voles over the past few years. These rodents undergo marked swings in population, reproducing at very high rates in good years, only to suffer catastrophic losses as their food supply runs out and ...
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    Nature 371 (1994), S. 734-734 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Alexander Rich1 says that Linus Pauling, together with Emile Zucker-kandl, in 1962, "by looking at changes in the amino-acid sequence of haemoglobin in different animals, could correlate the changes with the evolutionary period at which the animals diverged from each other", so as to measure ...
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  • 32
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    Nature 372 (1994), S. 498-499 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] CURRENT wisdom has it that the developing nervous system emerges by a process of selection, in which initially random synaptic connections are preserved or eliminated according to their patterns of activity. The best-studied example of this phenomenon is the neuromuscular junction, ...
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    Nature 371 (1994), S. 747-748 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of the earliest effects of insulin and growth factors on animal cells is the stimulation of protein synthesis. The mechanisms involved remain obscure, despite the identification of a plethora of potential regulatory proteins1. But progress is being made, the latest evidence ...
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    Nature 371 (1994), S. 751-751 
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    Source: Nature Archives 1869 - 2009
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    Notes: [Auszug] SIR - Roberts et all concluded that the human tibia discovered at Amey's Eartham pit, near Boxgrove, Sussex, UK, is between 524,000 and 478,000 years old (oxygen isotope stage 13), older than the Anglian ice-age of stage 12 (ref. 1). This conclusion is based on 'correlative mammalian ...
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    Nature 371 (1994), S. 753-754 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] HOWEVER you consider it, the label The Human Genome Project' is of course multiply misleading. As we all know, there's no one human genome, and we are deeply interested in precisely those stretches of the genomes that are not silent and where variation is high. Here we uncover clues ...
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    Nature 371 (1994), S. 752-752 
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    Notes: [Auszug] SIR - Bacteria swim by rotating their helical flagellar filaments. Each filament is driven with a flagellar motor embedded in the cell surface. The rotation rates of the motor had been reported to be high, for example, 270 r.p.s. for Escherichia coll1 and 170 r.p.s. for Salmonella ...
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    Nature 371 (1994), S. 756-756 
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    Notes: [Auszug] BETWEEN the orbits of Mars and Jupiter lie uncountable numbers of minor planets, or asteroids - to give them their more prosaic modern title. Asteroid number one, Ceres, was discovered on New Year's Day 1801. A thousand asteroids were known by 1921 and the number reached 2,000 by ...
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    Nature 371 (1994), S. 783-785 
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    Notes: [Auszug] The contribution to soil fertility from the mineralization of organic matter (OM) can be estimated from budgets of carbon and nutrients during agricultural use. A more detailed picture of the mineralization process can be obtained when coarse and fine, mineral-associated ...
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    Nature 372 (1994), S. 504-505 
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    Notes: [Auszug] IT is not so long ago that biologists became interested in nitric oxide (NO), but in that short period it has been found to carry out more important functions than virtually any other known messenger molecule1' . As they report on page 546 of this issue3, Kobzik et al. have found yet ...
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    Nature 372 (1994), S. 505-506 
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    Notes: [Auszug] Six years ago the Bermuda Atlantic Time Series station (BATS) was set up to document changes in the carbon, nutrient and productivity cycles at a single point in the open ocean. Measurement capabilities there have increased to the point where a complete suite of carbon system ...
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    Nature 371 (1994), S. 734-734 
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    Notes: [Auszug] SIR - A recent issue of Monthly Nature contained an article suggesting male contraception by vasectomy and cryopre-servation of sperm for eventual artificial insemination1. But the first steps in implementing this otherwise attractive scheme, as proposed by the authors, are that ". . .the military ...
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    Nature 371 (1994), S. 740-741 
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    Notes: [Auszug] IT is the biophysical equivalent of the Big Bang: a flash of light ruptures the covalent bond between carbon monoxide and iron in the protein myoglobin. The events following this submicroscopic explosion have been the subject of as much speculation as - and a lot more experimentation ...
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    Nature 371 (1994), S. 744-745 
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    Notes: [Auszug] ATOM manipulation using laser beams is starting to allow experiments to be performed which until recently one would have considered only as 'gedanken' or thought experiments. A prime example is the 'Heisenberg microscope' which Heisenberg used to illustrate his famous Uncertainty ...
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    Nature 371 (1994), S. 746-747 
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    Notes: [Auszug] THE early euphoria associated with the discovery of the high-Tc superconductors has now been replaced by the sober realization that practical applications can only come from a vast amount of hard work, with success by no means assured. This is in large measure due to the pathological ...
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    Notes: [Auszug] J.-M. C. is on sabbatical from Laboratoire de Neurobiologie Comparee des Invertebres, INRA CNRS URA 11290, La Guyonnerie, BP 23, 91440 Bures-sur-Yvette, France. SIR - Worker bees in eusocial Hymenoptera colonies often have functional ovaries which can produce fertile male eggs1. The sons of a ...
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    Nature 371 (1994), S. 751-751 
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    Notes: [Auszug] ROBERTS REPLIES - Bowen and Sykes state that the pre-Anglian age proposed for the Boxgrove tibia is not underpinned by any geochronological age estimate determined by physical-chemical means. We applied various methods of age estimation to the sediments and the fossils contained therein at ...
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    Notes: [Auszug] CONNIE Barlow has followed her successful anthology From Gaia to Selfish Genes with another handsomely designed volume of writings by distinguished evolutionists, ranging from Charles Darwin through Julian Huxley to E. O. Wilson. In this compendium she traces their attempts to ...
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    Notes: [Auszug] Two models have been proposed for the mechanism by which agouti protein inhibits stimulation of melanogenesis by a-MSH: (1) agouti is a negative regulator of the cyclic AMP signalling pathway acting through a unique agouti receptor10, or (2) agouti is a competitive antagonist of ...
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    Nature 371 (1994), S. 808-812 
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    Notes: [Auszug] Rebinding of photodissociated CO to myoglobin proceeds by two distinct processes: the CO can either rebind from within an internal cavity called the distal haem pocket, or it can escape and rebind from the solvent. Lowering the temperature slows and separates the processes, until ...
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    Nature 371 (1994), S. 812-812 
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    Notes: [Auszug] Nature 369, 336-339(1994) IN this Letter, our citation of the unpublished data of E. Butt and U. Walter was incorrect. We stated that Rp-8-pCPT-cGMPS and Sp-8-Br-cGMPS had been shown to be specific inhibitors and activators of cGMP-dependent protein kinase (cGMP-PK). In fact, Rp-8-pCPT-cGMPS is ...
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    Notes: [Auszug] ANDRE Lwoff, who died on 30 September, was one of the fathers of molecular biology. He began his scientific life at the age of 19, and during the course of his career made a major contribution to the transformation of biology from a collec-tion of dispersed disciplines into a single, ...
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    Nature 371 (1994), S. 640-640 
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    Notes: [Auszug] San Francisco & Cambridge, UK. The US computer and instrument company Hewlett-Packard last week became the source of two separate grants aimed at supporting basic research, acknowledging its founders' be-lief in the past (and future) contribution of such research to their company's fortunes. ...
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    Nature 371 (1994), S. 642-642 
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    Notes: [Auszug] London. Techniques for probing the struc-ture and properties of matter on the atomic scale have found much favour among the Nobel committee, from the Braggs' award for X-ray diffraction in 1915 to that for the scanning tunnelling microscope in 1986. This year's physics prize extends the same theme ...
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    Notes: [Auszug] HUMAN bodily odours are widely feared. The soap and cosmetics industries sell many of their products not as removers of dirt, but as destroyers of smell. Daedalus points out that the volatile smelly emissions from the human frame must be very small - perhaps a few milligrams a day. This tiny ...
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    Notes: [Auszug] With the Very Large Array (VLA) in the most compact D configuration, four fields centred around M82 were observed (3 h per field) on 24 and 25 January 1990, and eight additional fields including M81 and NGC3077 were observed (2 h per field) on 29 April and 1 May 1991, using all 27 ...
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    Notes: [Auszug] THE general belief that bayesian probability is simply a way of making bricks without straw (or inferences without data) is well entrenched. The late Sir Harold Jeffreys, one of the exponents of the view that, in estimating the probability of some event, one should be free to take ...
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    Notes: [Auszug] SYNAPTIC plasticity is thought to be fun-damental for learning and memory in vertebrates. The intense interest in N-methyl-D-aspartate (NMDA) receptor-dependent long-term potentiation (LTP) in the hippocampus stems from the belief that it provides a way to understand these synaptic ...
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    Nature 371 (1994), S. 655-656 
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    Notes: [Auszug] SHOULD a male work as hard to raise his family if there is a chance that he has been cuckolded? The common-sense answer is 'no', but examples of decreasing paternal care with an increasing chance of cuck-oldry have proved elusive. The finding by Dixon et al. (page 698 of this ...
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    Nature 371 (1994), S. 666-667 
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    Notes: [Auszug] How do you put both physicists and biologists on their guard? Answer: pro-pound a philosophical theory that ignores Darwin's demolition of essentialism in species and brands any physicist who denies your theory of natural kinds as an anti-realist. A traditional division in philosophy ...
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    Nature 371 (1994), S. 669-674 
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    Notes: [Auszug] Bouguer gravity and topography data from Tibet suggest that the surface of the plateau and the subsurface density interfaces are warped into two series of ridges and troughs trending parallel to the collision zone with wavelengths of 150 and 500 km. These folds are ...
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    Notes: [Auszug] The valence theory of Lewis1 remains the basis for most modern ideas on and classifications of the chemical bond2'3. Most such classifications rely on molecular-orbital and valence-bond theories within schemes involving the linear combination of atomic orbitals (LCAO)45. The ...
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    Notes: [Auszug] IN surveying biodiversity, it is all too easy to overlook microorganisms. The reason could not be more obvious - they are very small, and traditional methods for taking a census of them have severe technical limitations. Using methods that count molecules rather than cells, ...
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    Notes: [Auszug] SIR - Grabherr et al in their Scientific Correspondence1 present a grim progno-sis for montane plants trying to keep up with global warming. But the situation could be even worse. Climate change will probably involve both temperature and precipitation changes at most locations2. When ...
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    Notes: [Auszug] SIR - Solid-state high-pressure techniques are very useful for synthesizing polycrystalline copper oxide superconduc-tors, including the recently discovered HgBa2Can_1CuM02rt+2+s (Hg-12(n -1)«) and the infinite-layer compound Ca\-xAxCuO2 (where A is an alkaline earth ...
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    Nature 371 (1994), S. 664-664 
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    Notes: [Auszug] SIR - Guilderson et at.1 provided geo-chemical evidence that tropical sea sur-face temperatures (SSTs) in the western Atlantic may have been 5 ° C colder dur-ing the last ice age. This conclusion appears to reconcile a discrepancy be-tween tropical upland changes of 5-6 ...
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    Notes: [Auszug] IT cannot be in dispute that the transition from an illiterate to a literate culture entails a vast range of consequences over and above the ability to read this week's Nature. David Olson's fascinating (and infuriating) book advances a thesis that goes well beyond the (important) ...
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    Notes: [Auszug] Two classes of genes are necessary for proper bud-site selection2: BUD1-BUD2-BUD5 and BUD3-BUD4; the former is necessary for both bipolar and axial budding, the latter for converting a bipolar pattern to axial (Fig. la). In a and a cells budding is proposed to be axial, because all ...
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    Notes: [Auszug] In dorsalized embryos, Dorsal protein is restricted to the cytoplasm, whereas in ventralized embryos all nuclei around the egg circumference contain Dorsal protein1 3. Analysis of double mutants combining a ventralizing allele of Toll and a dorsalizing allele of the dorsal-group ...
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    Notes: [Auszug] Rapamycin prevents the activation of the late-Gl cyclin E/ Cdk2 kinase in the T-cell clones D10.G4.1 (Fig. 10) and CTLL-2 (ref. 8) and primary T lymphocytes (data not shown). The inactivity of cyclin E/Cdk2 in rapamycin-treated cells is not due to an inhibition of the expression of ...
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    Nature 372 (1994), S. 575-578 
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    Notes: [Auszug] PIERCE's mouse and human IsoCell CDS isolation kits are affinity chromatography tools for CDS cell enrichment (Reader Service No. 100). The company says that virtually all B lymphocytes and CD4 cells are removed using a negative selection process on affinity columns. And, a large ...
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    Nature 372 (1994), S. 389-390 
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    Notes: [Auszug] THE European Commission, the executive arm of the Euro-pean Union (EU), used to be a mere bit player in research. When its direct spending amounted to less than 2 per cent of spending in its member states, the frequent waywardness of its decisions on research could be overlooked. But ...
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    Nature 371 (1994), S. 717-720 
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    Notes: [Auszug] Previous structural and functional studies have shown that TFIIB has two domains: a 192-amino-acid C-terminal region containing two imperfect direct repeats, and a 124-amino-acid N-terminal region which contains a putative metal-binding site12 16. We have previously mapped the ...
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    Nature 371 (1994), S. 547-547 
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    Notes: [Auszug] London. This year's Nobel prize for physi-ology or medicine throws cell signalling into the limelight. The prize has been awarded jointly to Alfred G. Gilman and Martin Rodbell to honour their discovery of the role played by G pro-teins in cellular signal transduction, a decision ...
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    Nature 372 (1994), S. 391-391 
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    Notes: [Auszug] London. Virginia Bottomley, Britain's health secretary, last week announced that the gov-ernment had agreed to allocate an additional £40 million ($62 million) to university medi-cal schools to help cover the costs of re-search in teaching hospitals. Bottomley's decision is in line with ...
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    Notes: [Auszug] Munich. Sandro Fontana, Italy's former min-ister of research, has become the latest addi-tion to the list of individuals indicted over the mismanagement of funds belonging to the Italian Space Agency (ASI). Fontana, who was minister from July 1992 to August 1993, joins ASI's former ...
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    Nature 371 (1994), S. 546-546 
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    Notes: [Auszug] San Francisco. In the latest link-up between a large pharmaceutical company and a small genome-based biotechnology company, Rhone-Poulenc Rorer of France has signed a $ 16.5-million agreement with Darwin Mo-lecular Corporation, based in Seattle, Wash-ington, to work on gene therapies ...
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    Notes: [Auszug] Tokyo. Last week's major earthquake off the northern tip of Japan exposed both the strengths and weaknesses of Japan's system for preventing disasters in the aftermath of such events. Tsunami warnings were broad-cast on television with impressive speed, and some accurate predictions ...
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    Notes: [Auszug] Washington. In response to pressure from Congress, the biotechnology company Genentech has withdrawn its support for controversial 'height screening' programmes and other promotional activity for the syn-thetic human growth hormone Protropin, one of the first pharmaceutical products ...
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    Notes: [Auszug] SIR - In her diatribe against the role of primary care in Clinton's plans for health-care reform, Culliton demonstrates that C. Everett Koop does not have a monopo-ly on patent and dangerous nonsense. She misses the main point about general prac-tice: namely that well-trained ...
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    Notes: [Auszug] SIR - Miguel Indurain recently broke the world 1-hour cycling record, riding 53.040 km. The previous record was held by Graeme Obree, who rode an innovative bicycle of his own design and manufac-ture. Subsequently, the UCI (Union Cyc-liste Internationale) changed its rules to outlaw such ...
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    Notes: [Auszug] Tokyo. Hiroyuki Yoshikawa, the president of Tokyo University, has won the approval of the university's senate to set up a special 'presidential fund' based on a one percent levy on donations that faculty members receive each year from private industry. The fund will amount to only ¥60 ...
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    Notes: [Auszug] Strasbourg. The European Science Founda-tion (ESF), Europe's 'bottom-up' research organization whose members are national research funding agencies, is still seeking a new role, although its annual assembly in Strasbourg last week failed, despite its ef-forts, to achieve significant ...
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    Notes: [Auszug] Strasbourg. Antonio Ruberti, the European Union's research commissioner who will return to Italy as a professor of systems analysis at the Uni-versity of La Verna at the end of the year, is doing every-thing he can to leave a clear desk for Mme Edith Cresson, the former French prime ...
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    Notes: [Auszug] In the superconducting state, Cooper pairs of electrons form a condensate that can be described with one macroscopic wave-function. As a general consequence of this description, the num-ber of Cooper pairs and the phase of the superconducting wavefunction are non-commuting ...
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    Notes: [Auszug] THIS life-sized reconstruction of a mammoth-bone hut is just one of the spectacular items on show at Teeth, Tusks and Tar Pits, a permanent exhibition opening on 12 November at the Field Museum of Natural History in Chicago. The exhibition adds thematicallytotheD/V/4 to Dinosaurs \\a\\ which opened ...
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    Notes: [Auszug] ON page 487 of this issue1, John Gurdon and colleagues describe how they have taken a fresh look at how morphogenetic gradients work in the early stages of animal development. The gradient is an idea of long standing. It goes back to the experiments of Child in the early years of the present ...
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    Notes: [Auszug] New Delhi. Indian scientists, frequently frus-trated by the high cost of travel and sub-scriptions to foreign journals, are turning enthusiastically to a high-speed, satellite-based information highway with which they can communicate instantly and free of charge between themselves ...
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    Notes: [Auszug] Paris. France's ministries of health and of research have announced their intention to coordinate their support for genome research and its clinical applications under the um-brella of a single so-called ' Genome-Sante' programme. The initial goals of the joint programme, which will ...
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    Nature 372 (1994), S. 397-397 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] London. The United Kingdom's strict quar-antine laws should be immediately replaced with a system of vaccination and blood-testing for pet cats and dogs, according to a report published last week by the Agricul-ture Committee of the House of Commons. The committee says that scientific ...
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    Nature 372 (1994), S. 398-398 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Lander and Budowle1, in declaring the end of the controversy over the fo-rensic application of DNA technology, have presented a piece of propaganda that completely distorts the current situation in a very difficult matter at the nexus of science and law. The errors of the ...
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    Nature 372 (1994), S. 398-399 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - It is welcome news that the FBI, in an astonishing 180° change of direction, has agreed to adopt the interim ceiling principle recommended by the National Research Council (NRC)1. The reversal of policy is long overdue in view of the acceptance of the approach by many other ...
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    Nature 371 (1994), S. 609-612 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Classical studies suggest interactions between ridge and ZPA1'2'9. In the mouse, Fgf4 RNA is detected in the half of the ridge nearest the ZPA5, suggesting Fgf4 expression might be induced by ZPA signals. To test this, we first needed to isolate a probe for chick Fgf4. Although the ...
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    Nature 371 (1994), S. 471-471 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sao Paulo. This city, the traffic-jam capital of the world, may not be the whole of Brazil, but it is more than 10 per cent of it in terms of population, while the state of which the city is the capital earns roughly half of Brazil's gross national product and is home to half of Brazil's research. ...
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    Nature 372 (1994), S. 399-399 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The Committee on Medical Aspects of Food Policy of the Department of Health has set up a working group to prepare guidelines on the nutritional assessment of infant formulas. The group will be chaired by Dr Peter Aggett, head of nutrition, diet and health at the Insti-tute of ...
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    Nature 372 (1994), S. 400-402 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] CONTROVERSY continues to surround the Framework Convention on Climate Change, signed at the Earth Summit in Rio in 1992. While preparations are under way for the first meeting of the signatories to the convention, due to be held in Berlin next year, the scientific community, repre-sented by the ...
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    Nature 372 (1994), S. 403-403 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WHAT exactly is a random number? Many senses in which that question may be under-stood evidently make no sense. For exam-ple, it is nonsensical to ask in the abstract whether "3" is a random number. For one thing, it cannot be described as random without specifying the range of numbers from which ...
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    Nature 371 (1994), S. 484-484 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the decade before 1492, when Columbus was shuttling across the Iberian peninsula seeking royal sponsors for his so-called "Enterprise of the Indies", the Genoan sea captain read three books over and over again. These volumes were presumably called upon by Columbus in discussion with various ...
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    Nature 371 (1994), S. 369-369 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Paris. Formal charges of "collusion in poisoning" are expected to be made this week against Laurent Fabius, the former Socialist prime minister, and two of his cabinet colleagues - Edmond Herve and Georgina Dufoix - over their role in France's HIV-contaminated blood scandal in the mid-1980s. The ...
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    Nature 372 (1994), S. 407-408 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ANYONE who has panted and plodded up a mountain peak has felt the profound effects of decreasing atmospheric pressure with elevation. But what in the geological record might document this important variable? If palaeoatmospheric pressures could be estimated at given locations, these ...
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    Nature 371 (1994), S. 372-372 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - You say it is a mystery why Linus Pauling did not identify the structure of DNA before Watson and Crick (Nature 370, 584; 1994). Pauling did not think it was a mystery. He was a passenger on a flight of mine from Miami to San Francisco in the early 1980s when I was a United Air Lines ...
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