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  • Nature Publishing Group  (3,427)
  • 1970-1974  (3,427)
  • 1973  (3,427)
  • 1
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 383-383 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As Lord Kelvin pointed out in 1876, a wobble of the Earth will induce an oceanic tide. In the case of the Chandler wobble, now known to have a period of about 14 months, the induced tide (pole tide) has a calculated equilibrium amplitude of only about 0.5 cm, but is important because, if really ...
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  • 2
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    Nature 246 (1973), S. 385-385 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AMONG the many botanists in the British Isles are A. M. M. Berrie (Glasgow), K. D. Gardiner (horticulturist, Dublin), B. E. Juniper (Oxford), R. P. Moss (Birmingham), B. L. Moss (Newcastle upon Tyne) and F. Rose (King's College, London). Fish biologists and oceanographers have in their ranks J. C. ...
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  • 3
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    Nature 246 (1973), S. 389-395 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An ancestral myoglobin chain has been deduced by comparing the differences in the amino acid sequences of eighteen living species and assessing from the fossil evidence the probable times of divergence of their ...
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  • 4
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 400-402 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Although comet Kohoutek has not lived up to some of the more extravagant claims made for its astronomical prominence, Professor Biermann shows that observations will still be fruitful because so little is known about the nature of ...
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  • 5
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 410-411 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The answers to all these questions are basically connected with the problem of how a swarm of particles in similar orbits will develop. There is a general belief that the collisions (and other types of interaction) between the particles will cause a diffusion so that a state according to Fig. la ...
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  • 6
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    Nature 246 (1973), S. 431-432 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IF people who are not scientists are asked to describe their image of a scientific genius, the picture they paint seems more often than not to be based on a distorted memory of Einstein. The shaggy hair, the neglected appearance, the absentmindedness (presumably all induced by a complete devotion ...
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  • 7
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 433-434 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DIALECTICAL materialism is too much like an established religion to be discussed dispassionately. In its name, as in the name of Christianity or of Islam, many terrible crimes have been committed and many errors promulgated. But since any philosophy of science within the Soviet Union is bound to be ...
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  • 8
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 432-432 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THIS is a textbook for a short course in geophysics given by the Open University. The book does not attempt to cover the whole subject but chooses three topics as representative of different aspects. The first is the structure and physical properties of the Earth's crust and upper mantle as ...
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  • 9
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 436-436 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE theme of this book is evolution: though the author describes a wide range of biological research, it is unified by constant reference to the random events, in the form of mutations and of association of molecules and cells, which are followed by the evitable selection. "The individuals produced ...
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  • 10
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 437-437 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-Thumbs down to your editorial of October 19, "Technological Success, Scientific Failure?" on the Earth Resources Technology Satellite (ERTS). Perhaps you were deliberately being provocative to sting one or two of your readers into clarifying what many are unsure about, in which case, as one of ...
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  • 11
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 438-438 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] University News Heriot-Watt University has conferred the title of Professor Emeritus upon Dr Walter G. Green. The University of St Andrews has appointed Professor Vincent Bruce Proudfoot to the newly established Chair of Geography. Appointments Mr Alan V. Holden has been appointed Officer in ...
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  • 12
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    Nature 246 (1973), S. 321-321 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE London Association of Correctors of the Press held a conversazione on Saturday last under the presidency of Mr. B. H. Cowper, editor of the Queen. We are glad to notice that the principal items of the programme were of a scientific character. Mr. E. R. Johnson, Chairman of the Association, read ...
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  • 13
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    Nature 246 (1973), S. 326-326 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] NORTH Sea gas will not last for ever. When reserves are exhausted, which is estimated to be in about twenty years time, what will there be to replace it? One possible candidate now being actively studied is a substitute natural gas (SNG) made from coal. A plant for producing SNG is now being ...
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  • 14
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 326-326 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Blowing in the Wind A NOVEL aspect of the energy crisis was revealed in Pravda last week (November 27). Ten million tonnes of Soviet coal are, it seems, lost annually in transit. With the increasing mechanisation of the mining industry, the proportion of the fine fraction in each coal shipment has ...
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  • 15
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    Nature 246 (1973), S. 329-330 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of the most promising effects of the juvenile hormone and its synthetic mimics, considered as potential agents for pest control, has been the disruptive action they can exert on subsequent development when applied to the pregnant female or to the developing eggs. In some insects not only can ...
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  • 16
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    Nature 246 (1973), S. 331-332 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] CAN membrane bound iron-sulphur proteins with midpoint redox potentials lower than -530 mV be involved in the primary photochemical events of chloroplast photosynthesis? This is a question posed from recent work of Ke, Hansen and Beinert (Proc. natn. Acad. Sci., U.S.A., 70, 2941; 1973). It is about ...
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  • 17
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    Nature 246 (1973), S. 332-333 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BECAUSE of bad communications, early Russian work on the changes of seismic velocity associated with earthquakes took a long time to become known in the west, and even more surprisingly in Japan. Thus although as long ago as 1962 Kondratenko and Nersesov (Trudy Inst. Fiz. Zemli, 25, 130; 1962) had ...
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  • 18
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 333-334 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE subject matter of the twelve contributions presented at a symposium on fatigue in composites organised by the Institute of Physics at Imperial College, London, on November 15, ranged widely. The fields covered included the behaviour of metal matrix composites reinforced with metal fibres and ...
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  • 19
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 334-334 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MANY studies of nucleon transfer reactions between heavy ions have shown typically bell-shaped angular distributions centred at angles around 30. These distributions can easily be understood using a classical model of the interaction. The lighter of the two ions approaches the heavier along a ...
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  • 20
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    Nature 246 (1973), S. 351-352 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Technical details on test conditions and on PAR determinations have been described1-2. The test provides a quantitative measurement of the recognition of alloantigens, present on Fx hybrid target cells, by lymphoid cells of parental lineage. Interaction with antigen occurs in vitro within a few ...
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  • 21
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    Nature 246 (1973), S. 357-358 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] My theory is based on some well known facts. Many insects have so-called tiered retinulas with one or more basal (or proximal) visual cells and both theoretical4 and experimental5*6 results indicate that the microvilli of rhabdomeres exhibit dichroism with a dichroic ratio of 2. Furthermore, ...
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  • 22
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    Nature 246 (1973), S. 363-364 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I FIND this book very attractive. It is a most readable and lively text, enriched by a wealth of stories and anecdotes that are surprisingly accurate in all the fields in which I can check them. The author has made a remarkably erudite study of the history of brain exploration from Greek times to ...
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  • 23
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 364-365 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the past decade there has been a considerable expansion in the study of bacterial plasmids. From the early days, when the plasmid F served as a mere tool for unravelling the intricacies of Escherichia coli genetics, their importance has increased concomitant with the realisation that quite ...
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  • 24
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 363-363 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DR MUIRHEAD describes this as "a textbook on special relativity from the high-energy physicist's point of view". He expresses surprise that "no undergraduate textbooks on special relativity have been written by high-energy nuclear physicists". Although his own attempt is enterprising and ...
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  • 25
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    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 364-364 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DAVID McKm, of The Guardian, tells a lively tale of the political problems of deciding where London's third airport should go. In 1944 Lord Swinton, Minister of Civil Aviation, had been able to say of Heathrow that it was the "only possible site" for London's airport. No one is so sure about ...
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  • 26
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    Nature 246 (1973), S. 365-366 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] "DESPITE the growing concern about the employment of graduates", say the editors of this collection of essays by different authors, "there has so far been little attempt to place the problem in perspective". Certainly much of the public discussion has been concentrated upon short-term variations in ...
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  • 27
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    Nature 246 (1973), S. 360-362 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There is nothing special about the circular morphology of the random dot interference patterns. By performing other transformations of the random pattern about a fixed centre point before superposition new morphologies arise. For example, by uniformly expanding Fig. la, we obtain Fig. Ib. A ...
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  • 28
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    Nature 246 (1973), S. 364-364 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THIS book should be called "Readings in Early Human Development". It reprints twenty-nine papers (some mercifully shortened), grouped in seven sections. Each section has a brief but well documented introduction. Most of the papers are without summaries. There is a perfunctory subject index, but no ...
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  • 29
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    Nature 246 (1973), S. 365-365 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE title of this book gives the impression that its scope is wider than in fact is the case. Of the sixteen chapters, twelve are concerned with developmental topics, including discussions of the developmental significance of interstitial cells, organismic polarity, histo-logical and ...
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  • 30
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    Nature 246 (1973), S. 366-366 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE series of volumes with this title forms one of the curious spontaneous developments of modern psychology. The first appeared six years ago; it reported the papers given at a small gathering of like-minded researchers organised in Holland by Andries Sanders. The gathering was fun; two more ...
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  • 31
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    Nature 246 (1973), S. 241-241 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] LUNOKHOD-2, which landed on January 16, 1973, in the Le Monnier crater on the eastern edge of Mare Serenitatis, had a region of particular selenological interest to explore-the transition from mare to highland. Operating among features assigned unofficial working names such as 'Head-on Hills', ...
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  • 32
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    Nature 246 (1973), S. 245-245 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SEVERAL years ago it was suggested that the 5S RNA of the SOS ribosomal sub-unit is important for transfer RNA-ribosome binding. In particular, it was recognised that the sequence UpGpAp-ApCp of 5S RNA could interact with the Ti//C loop of tRNA. Evidence has since been accumulating to support this ...
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  • 33
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    Nature 246 (1973), S. 247-248 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] STRYCHNINE is not perhaps the most subtle of drugs. Sensible persons would do better to inquire among the more obscure members of the South American Crotalidae or Elapidae for poisons acting with rather less striking manifestations. Nevertheless strychnine, in spite of its shortcomings, has had a ...
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  • 34
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    Nature 246 (1973), S. 271-273 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE primary energy pattern in Australia is undergoing a very significant change due mainly to the discovery in 1966 in Bass Strait of oil and gas in commercial quantities. Prior to that the search for oil had been going on for a long time with some minor successes, but it was the Bass Strait strike ...
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  • 35
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    Nature 246 (1973), S. 282-284 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FOR perhaps ten years after the Second World War, Australia and the United Kingdom shared most of the basic discoveries in radio astronomy. These discoveries have extended the distance horizon of the Universe by an order of magnitude and revealed previously unsuspected sources of energy generation ...
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  • 36
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    Nature 246 (1973), S. 295-297 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The absence of such a correlation for quasars with flatter spectra may be attributed either to a broader dispersion in luminosity or to redshifts in these quasars, which are intrinsic to the source rather than a measure of cosmological distance. Although Setti and Woltjer prefer the explanation of ...
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  • 37
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    Nature 246 (1973), S. 299-300 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The inner conductor is not permitted to have any physical support in relation to the outside structure and thus has to be levitated. This can most easily be done by making the inner conductor or certain parts of it from a ferromagnetic substance. A properly applied auxiliary external ...
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  • 38
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    Nature 246 (1973), S. 303-303 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Part of the deposit has been excavated, to a depth of 2 m, where massive slabs of rock fall were encountered. The lowest level excavated yielded extinct fauna, including a mandible in situ of the extinct giant kangaroo, Sthenurus orientalis. Immediately above the horizon containing extinct fauna ...
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  • 39
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    Nature 246 (1973), S. 306-307 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Effect of supernatants from macrophages of endotoxin-treated CBA/J mice on PHA-induced DNA synthesis by normal CBA/J spleen cells. Donors received 400 ug of Salmonella typhimurium endotoxin s.c. at the times shown before collection; this treatment had previously been shown9 to produce marked ...
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  • 40
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    Nature 246 (1973), S. 309-311 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As some of the past work on synthesis was based on methods now known to be unsatisfactory in certain respects, we have re-investigated the problem with techniques that avoid difficulties inherent in much of the earlier work. These difficulties are overcome by limiting the availability of the ...
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  • 41
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    Nature 246 (1973), S. 183-183 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ENERGY in the 1980s, last week's symposium at the Royal Society, painted several different pictures of future trends. Mr D. Clark of the Central Electricity Generating Board, pointing out that his board is the largest consumer of fuel in Europe, stated that coal will be the board's staple fuel ...
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    Nature 246 (1973), S. 185-185 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE physical nature of quasistellar objects is as puzzling now as it was 10 years ago when their large redshifts were discovered. Within 3 years of those first redshift determinations the difficulties encountered theoretically in explaining the observed radio and optical properties of the QSOs, if ...
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    Nature 246 (1973), S. 319-319 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-In the background information to the discussion on orotic aciduria and arginine deficiency, Milner and Visek stated1 that Scull and Rose had shown2 that "the growing rat ... requires arginine for optimum nitrogen retention and normal growth." In point of fact, Scull and Rose had concluded2 ...
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    Nature 246 (1973), S. 188-188 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE study of the role of haemin in protein synthesis is interesting because it provides evidence that some regulation takes place at the level of translation. When haemin is added to a cell-free system containing globin messenger RNA globin synthesis is stimulated, but so too is the synthesis of ...
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    Nature 246 (1973), S. 189-189 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] JOAN ARGETSINGER STEITZ has continued her studies on the control of the initiation of protein synthesis in the small RNA bacteriophage called R17. She had previously determined the nucleo-tide sequence of the three initiator fragments of the RNA, each about thirty residues long, which are ...
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    Nature 246 (1973), S. 183-183 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR RICKARD CHRISTOPHERS is 100 next Tuesday, November 27. He started his scientific career in 1898 as a member of the Malaria Commission, jointly appointed by the Royal Society and the Colonial Office. Ronald Ross had just published his classical work on the mosquito as vector and Christophers, ...
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    Nature 246 (1973), S. 197-199 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The multiplication of epithelial cells in plastic dishes is limited by the amount of plastic surface available per cell, that of fibroblastic cells by the availability of medium factors. Contacts between cells do not appear to limit the multiplication of either cell type. The multiplication of ...
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    Notes: [Auszug] To avoid any assumptions as to the nature of the red-shifts, two of us (D. J. and*C. H.) started, not with a list of QSOs, but with a list of 280 radio sources selected from the 4C catalogue and for which we had measured improved positions. The fields around each of these sources were examined ...
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    Nature 246 (1973), S. 212-213 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In a summary of earlier research, we reported1'2 that decomposed plant leaf litters contain large numbers of freezing nuclei and that these nuclei are perhaps responsible for the nucleating abilities of soil particles. (Freezing nuclei are defined as particles capable of nucleating ice in ...
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    Nature 246 (1973), S. 223-224 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Anthers from several buds were pooled in three groups, each of which contained either pollen tetrads, immature microspores or mature pollen grains. Segments of about 5 mm were excised from the central region of anthers and their contents gently squeezed out into 10% sucrose solution. The suspension ...
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    Nature 246 (1973), S. 219-221 
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    Source: Nature Archives 1869 - 2009
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    Notes: [Auszug] Two recent advances have permitted us to incorporate rhodopsin into model membranes. One is the report by Hong and Hubbell8 on the preparation of detergent-free phospholipid vesicles containing purified rhodopsin. The other is the report by Montal and Mueller9 on the formation of lipid bilayers, in ...
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    Nature 246 (1973), S. 226-230 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Proposing a different family of models is not intended as a rejection of the predicament position; indeed, for the present purpose of a broad discussions of assumptions, the predicament models would have to be invented if they did not already exist. The vital policy issues of the next few decades ...
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    Nature 246 (1973), S. 215-217 
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    Source: Nature Archives 1869 - 2009
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    Notes: [Auszug] The widespread occurrence of prostaglandins in animal tissues together with their mode of action on a wide range of physiological systems has led to the proposition that these substances may have a general function as modulators of cellular responses to a variety of stimuli9 (for example, to ...
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    Nature 246 (1973), S. 221-223 
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    Notes: [Auszug] Studies of the intracellular distribution of phages cpX174 and T2 in the organs of rabbits and guinea pigs demonstrated that when they were taken up by the cells of the reticuloendo-thelial system (RES), most plaque-forming units (PFU) became localised in the larger granular fraction (lysosomes and ...
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    Nature 246 (1973), S. 231-231 
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    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is no longer particularly original or bold to cry out against science and its misapplications. This collection of characteristic texts, mostly of French origin but many translated from English and several from Italian, is significant mainly because it attempts a comprehensive attack from the ...
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    Nature 246 (1973), S. 232-233 
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    Notes: [Auszug] DR SUSSMAN'S book is written in an engaging and buttonholing style that has the vigour (and the jokes) that will be familiar to those who have heard him lecture. This inimitable style is admirably suited to his purpose which is to demonstrate "the extraordinary power of science as a method of ...
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    Nature 246 (1973), S. 233-233 
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    Notes: [Auszug] SOME ten years ago, A. J. Marshall edited two volumes on the biology and physiology of birds. This volume is the second in a series of three which provide an updated and much needed replacement for Marshall's work. There are new editors, almost all new authors, a different organisation, and more ...
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    Nature 246 (1973), S. 234-234 
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    Notes: [Auszug] FOOD science differs from other sciences in drawing on a wider range of disciplines for its techniques ; the authors have done well to cover most of them in less than 300 pages. Each chapter is a wide ranging survey of a subject starting with an introduction to the basic concepts and generally ...
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    Nature 246 (1973), S. 235-235 
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    Notes: [Auszug] PROFESSOR E. A. STEWARDSON, Emeritus Professor of Physics, Leicester University, who died on August 24, 1973, at the age of 68, was born in 1904, and educated at Hawarden County School, North Wales. He graduated from the University of Liverpool in 1924 with first class honours in physics and took ...
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    Nature 246 (1973), S. 236-236 
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    Notes: [Auszug] IN the article "Model for the Mating Protocol of Synchronously Flashing Fireflies" by J. E. Lloyd (Nature, 245, 268; 1973) paragraph 11, line 7 and following, should read "This is not apparent and perhaps does not occur in most Pteroptyx species. I spent many hours within swarms watching ...
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    Nature 246 (1973), S. 123-123 
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    Notes: [Auszug] THE appearance of three articles on the control of repression of the tryptophan operon (Nature new BioL, 245, 131, 133 and 137; 1973) leaves no doubt that negative control of enzyme synthesis exists. More recently (see Nature, 245, 407; 1973), it was suggested that positive control for biosynthetic ...
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    Nature 246 (1973), S. 126-126 
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    Notes: [Auszug] SINCE the ground state of an oxygen molecule contains two unpaired electrons, there has for many years been speculation as to whether the dimer, (O2)2, could form. In 1924 G. N. Lewis suggested, on the basis of measurements on the magnetic susceptibility of the liquid, that some dimerisation does ...
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    Nature 246 (1973), S. 129-133 
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    Notes: [Auszug] Nitrogen dioxide and its related compounds react strongly with ozone, usually resulting in the destruction of the ozone, and life seems to be delicately adjusted to the radiation shield which the stratospheric ozone provides. We have found that atmospheric NO2 occurs in two layers, ...
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    Nature 246 (1973), S. 141-143 
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    Notes: [Auszug] I answer each of these points in order, concentrating primarily on the rare earth (RE) data which I emphasized2, and omitting petrological and isotopic arguments, which will be discussed elsewhere. Also, several of O'Hara's comments concerning rare earth fractionation are, unfortunately, wrong. ...
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    Nature 246 (1973), S. 144-145 
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    Notes: [Auszug] Fig. 1 The structural formula of ICI 65,709; l-/?-chlorophenyl-3-(m isobutylthioureido) phenyl guanidine hydrochloride. The method of testing for antiviral activity has been fully described2'3. In brief, it consists of infecting tissue-culture cells in 3 X 0.5-inch tubes with 100 TCD50 of test ...
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    Nature 246 (1973), S. 148-150 
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    Notes: [Auszug] Air-dried or flame-dried chromosome slides were prepared from various cell sources: cultured human lymphocytes, a subline of the rat kangaroo (Potorous tridactylis) cell line Pt-Ki, an Indian muntjac *(Muntiacus muntjak) cell line KLS (established in our laboratory), rat (Rattus norvegicus) ...
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    Nature 246 (1973), S. 133-136 
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    Notes: [Auszug] The two regions of λ DNA to which the λ repressor binds (the operators) are shown to consist of multiple, non-identical repressor binding sites. The arrangement of these sites with respect to the adjacent controlled genes has been determined using a restriction endonuclease that ...
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    Nature 246 (1973), S. 138-139 
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    Notes: [Auszug] Particulates were sampled from the following wind systems (number of samples in parentheses): North Atlantic Westerlies (4); Atlantic Westerlies/North East Trades boundary region (3); Atlantic North East Trades (7); Atlantic ITCZ (3); Atlantic South East Trades (5); variable winds, South African ...
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    Nature 246 (1973), S. 143-144 
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    Notes: [Auszug] If the product is not to have the same chemical composition as the starting material, time must be allowed for diffusive segregation of chemical constituents. Galimov estimates the duration, /C0n, of dynamic pressure due to bubble collapse as 2xlO~s s. In this time diffusive segregation could occur ...
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    Nature 246 (1973), S. 150-151 
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    Topics: Biology ,