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  • Articles  (295)
  • 1965-1969  (295)
  • Medicine  (264)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (31)
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  • Articles  (295)
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  • 1
    Electronic Resource
    Electronic Resource
    The salivary gland chromosomes of Anopheles hectoris (1966)
    Springer
    Chromosoma 19 (1966), S. 126-136 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The salivary gland chromosome map of Anopheles hectoris is described and figured. It is proposed that this map be considered the standard for this species. The hectoris chromosomes show a close relationship to those of Anopheles pseudopunctipennis pseudopunctipennis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332796
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of the chromosomes in human primordial oocytes (1967)
    Springer
    Chromosoma 22 (1967), S. 358-377 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Primordial oocytes (oocytes in primordial follicles) from human ovaries aged 51/2 months post conception to 11 3/4 years post partum were examined in: (a) squash preparations of fresh and fixed tissue; (b) histological preparations; and (c) thin sections by electron microscopy, in order to study the structure of the chromosomes. — The light microscope shows that the chromosome consists of a thread bearing numerous fine lateral appendages. Cytochemical tests indicate that the thread contains DNA, and is surrounded by material containing RNA and protein. — The electron microscope shows that there are three main structural components in the chromosome: (i) an axis or “core” containing at least two longitudinal strands about 200 Å thick; (ii) a surrounding sheath composed of coiled fibrils which form symmetrically arranged columns and loops, and (iii) clusters of large granules which are associated with the outer parts of the sheath. Small nucleoli and other granular bodies are also present. — These observations indicate the presence of lampbrush chromosomes in the human oocyte. The significance of this type of chromosome in mammals is discussed in relation to the differential radiosensitivity of the oocytes, and to the form of chromosomes at the dictyate stage in rodents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319880
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  • 3
    Electronic Resource
    Electronic Resource
    Chemotherapy of Animal Parasites (1968)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Pharmacology 8 (1968), S. 213-228 
    Details
    ISSN: 0362-1642
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pa.08.040168.001241
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  • 4
    Electronic Resource
    Electronic Resource
    Metal Complexing by Tris Buffer (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 906-907 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ion, hydroxy-aquofo'sethylenediamine cobalt(III) [A] which is stable between PH 6 and 8 reacts with a-amino-acids and peptides to form complexes B as shown: Fig.1. Absorption spectrum for [Coen2(H2O)(OH)][N03]2 (A)\ ' , absorption spectrum of (A) and tris buffer (C). Both run at pH 7-3 in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214906a0
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  • 5
    Electronic Resource
    Electronic Resource
    Binding of Tetracycline to Mammalian Spermatozoa (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 403-404 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rabbit, boar, and human semen, from fertile individuals, were mixed with µg quantities of tetracycline HC1 in 0.9 per cent saline, Ringer, Krebs-Ringer phosphate or Tyrode solution for 10-30 min. Results with the various physiological solutions were comparable. Both bright and dark-field ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214403a0
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  • 6
    Electronic Resource
    Electronic Resource
    Radiosensitivity of Oogonia and Oocytes in the Foetal and Neonatal Monkey (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 981-983 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Germ cells in developing female monkeys are considerably more resistant to radiation-induced cell death than those at equivalent stages of gametogenesis in rats and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214981a0
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetic Evidence for an Intermediate Stage in the Fertilization of the Sea Urchin Egg (1969)
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 488-490 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fertilization can be blocked by several very different agents. Although Rothschild and Swann3 and Hagstrom and Hagstrom4 have made use of two such agents to effect functional separation of sperm from eggs and thus have measured the rate of fertilization of sea urchin eggs, no systematic comparison ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/221488b0
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  • 8
    Electronic Resource
    Electronic Resource
    Dinitrophenol decreases the Radiation Sensitivity of L Cells (1967)
    [s.l.] : Nature Publishing Group
    Nature 216 (1967), S. 708-709 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] L-929 cells were used as monolayers on Eagle's medium (MEM) supplemented with calf serum (10 per cent serum for monolayers, 17 per cent serum for cell survival studies) in glass bottles. For cell survival experiments, monolayers were trypsinized, counted with a haemacytometer, diluted with fresh ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/216708a0
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  • 9
    Electronic Resource
    Electronic Resource
    Porphyrin Abiogenesis from Pyrrole and Formaldehyde under Simulated Geochemical Conditions (1967)
    [s.l.] : Nature Publishing Group
    Nature 216 (1967), S. 29-32 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Experiments with gas mixtures intended to simulate primeval atmospheres have yielded a great many types of chemicals of biological interest. It has now been shown that metal porphyrin complexes are commonly produced in these ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/216029a0
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  • 10
    Electronic Resource
    Electronic Resource
    The Student's Microscope (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 237-238 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] How suitable are modern students' microscopes for teaching undergraduates? Dr Baker has been investigating the ergonomics of microscope construction for several ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/215237a0
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