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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 10 (1977), S. 193-209 
    ISSN: 1432-1432
    Keywords: Prebiotic ; Polymerization ; Deoxythymidine oligonucleotides ; Deoxythymidine 5′-triphosphate ; Deoxythymidine 5′-monophosphate ; 4-amino-5-imidazolecarboxamide ; Cyanamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When an aqueous solution (pH 7.0) of3H deoxythymidine 5′-triphosphate, deoxythymidine 5′-phosphate, 4-amino-5-imidazolecarboxamide, cyanamide and ammonium chloride was dried and heated at 60°C for 18 h, oligomers were obtained in a yield of approximately 80%. After the chemical degradation of any pyrophosphate bonds present in these oligomers, linear polynucleotides of up to 7–8 units in length were isolated by DEAE cellulose column chromatography and identified by enzymatic digestion procedures. The di- and trinucleotide fractions were degraded 87% and 100% by snake venom phosphodiesterase and 39% and 9% by spleen phosphodiesterase. This synthesis of deoxythymidine oligonucleotides was conducted under potentially prebiotic conditions and may offer a possible method for the synthesis of deoxyoligonucleotides on the primitive Earth.
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  • 2
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An 18-year-old male patient is described who possesses both kidneys on one side (crossed renal ectopia), together with pelvic lipomatosis. In general, lipomatosis is benign, but here the tissue shows the rare feature of malignancy. Chromosomally, the patient is typically characterised by somatic translocations involving chromosome 1 (37% metaphases); these almost always exhibit a whole chromosome translocation with chromosome 6 (35%), although involvement of chromosome 1 with chromosome 8 is present in 2% of metaphases. Other chromosomal features encountered in Giemsastained and G-banded preparations from lymphocyte cultures include the prevalence of a small Y chromosome in 25% of metaphases, the presence of marker dots in 20%, and acrocentric associations in 8%–10% of metaphases. However, more than 50% of metaphases have a normal 46 XY karyotype with a normal-sized Y-chromosome. Crossed renal ectopia with pelvic lipomatosis can therefore be assigned to a new syndrome characterised by a whole-chromosome translocation involving chromosomes 1 and 6.
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 499-499 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] L. mysorense Heyne is a wild species distributed in the mountainous regions of India and Ceylon at altitudes between 3,000 and 6,000 ft. Material of this species collected from the Western Himalayas and the Western Ghats in India was found by us to possess 2n = 60 chromosomes, a number hitherto not ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 1190-1190 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Pal, Singh and Vishnu Swarup5 described from India a new species, Abelmoschus tuberculatus Pal et Singh, related to okra. The chromosome number of this wild species was determined by us4 to be 2n = 58. Moiosis and seed setting in A. esculentus (2n = 130) and A. tuberculatus (2n = 58) were normal. ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 419-420 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Hainan, Chandrasekharan and Krishnaswamy3 reported that the species possessed 2n = 54 chromosomes and that, during meiosis in the pollen-mother -cells; bivalents and quadrivalents (1 per cell) were formed. We re-examined meiosis in the pollen-mother cells of this species and observed the types of ...
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 134 (1934), S. 29-29 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a recent communication to NATURE1, entitled, “Origin of the Angiosperms”, Dr. Anderson puts forward the interesting suggestion of the possible origin of modern flowering plants through the Magnoliales from wide crosses between different groups of Gymnosperms showing 12 and 7 ...
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 822-823 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the recent issue of the New Phytologist1, Mrs. Agnes Arber, in a paper dealing with the above subject, raises certain points which are of fundamental importance to all plant morphologists. She discusses the use of anatomical evidence in phylo-genetic morphology and comes to ...
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 409-409 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE synergids in the embryosac of angiosperms usually degenerate as soon as the process of fertilisation has been completed. During the course of a morphological study of Ammania baccifera, Linn. (Lythraceæ), however, we have found them to be persistent up to a very late stage of embryo ...
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 184 (1994), S. 390-393 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Section 43 (1987), S. 1017-1021 
    ISSN: 0584-8539
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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