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  • 1
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    Genetic evaluation of suspected cases of transient HIV-1 infection of infants (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-06
    Description: Detection of human immunodeficiency virus-type 1 (HIV-1) on only one or a few occasions in infants born to infected mothers has been interpreted to indicate that infection may be transient rather than persistent. Forty-two cases of suspected transient HIV-1 viremia among 1562 perinatally exposed seroreverting infants and one mother were reanalyzed. HIV-1 env sequences were not found in specimens from 20; in specimens from 6, somatic genetic analysis revealed that specimens were mistakenly attributed to an infant; and in specimens from 17, phylogenetic analysis failed to demonstrate the expected linkage between the infant's and the mother's virus. These findings argue that transient HIV-1 infection, if it exists, will only rarely be satisfactorily documented.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Frenkel, L M -- Mullins, J I -- Learn, G H -- Manns-Arcuino, L -- Herring, B L -- Kalish, M L -- Steketee, R W -- Thea, D M -- Nichols, J E -- Liu, S L -- Harmache, A -- He, X -- Muthui, D -- Madan, A -- Hood, L -- Haase, A T -- Zupancic, M -- Staskus, K -- Wolinsky, S -- Krogstad, P -- Zhao, J -- Chen, I -- Koup, R -- Ho, D -- Korber, B -- Apple, R J -- Coombs, R W -- Pahwa, S -- Roberts, N J Jr -- AI27757/AI/NIAID NIH HHS/ -- AI32910/AI/NIAID NIH HHS/ -- UO1-27658/PHS HHS/ -- etc. -- New York, N.Y. -- Science. 1998 May 15;280(5366):1073-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatrics, University of Rochester, Rochester, NY 14642, USA. lfrenkel@u.washington.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9582120" target="_blank"〉PubMed〈/a〉
    Keywords: DNA, Viral/analysis/genetics ; Diagnostic Errors ; Equipment Contamination ; Female ; Genes, env ; HIV Infections/immunology/transmission/*virology ; HIV-1/*genetics/*isolation & purification ; Humans ; Infant ; Infant, Newborn ; Infectious Disease Transmission, Vertical ; Molecular Sequence Data ; Phylogeny ; Polymerase Chain Reaction ; RNA, Viral/analysis ; *Specimen Handling ; T-Lymphocytes, Cytotoxic/immunology ; Viremia/virology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    Ovis astore , a Three-Coated Sheep (1932)
    [s.l.] : Nature Publishing Group
    Nature 129 (1932), S. 436-437 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN Prof. Barker's description of the sheep from Astore (Gilgit),1 several points which bear upon his subsequent discussion of the development of the fleece of domesticated sheep are not clear. For example, it would be of great interest to know (1) whether the individual animal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/129436b0
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  • 3
    Electronic Resource
    Electronic Resource
    Cystine Requirements of Fleece Growth (1933)
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 966-966 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE considerable sulphur content of clean wool, and its presence substantially in the form of a cystine nucleus, has led to much inquiry into the question of cystine being a limiting factor in wool growth. Various estimates of the cystine requirement for the fleece production have been made, on ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/132966a0
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  • 4
    Electronic Resource
    Electronic Resource
    Origin of Curls and Twists in Wool Fibres (1933)
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 201-201 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WILDMAN1 has recently discussed the sequence of development of the fœtal lamb's coat, showing early anterior to posterior and later secondary progressions in follicle initiation over the skin surface. He directs attention to the spiral shape of wool follicles and the changes in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/131201a0
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  • 5
    Electronic Resource
    Electronic Resource
    Efficiency of Food Utilization for Milk Production (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 609-610 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For the milch cownowadays a particularly appropriate animal for examination in this light American workers have made many estimates on an energy basis, in terms of total digestible nutrients consumed and quantity of milk produced, the latter being expressed as 4 per cent or Fat Corrected Milk. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167609a0
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  • 6
    Electronic Resource
    Electronic Resource
    Meteorological factors affecting fertility in the sheep (1927)
    Springer
    Molecular genetics and genomics 43 (1927), S. 313-329 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01741013
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  • 7
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    Impacts of climate and vegetation change on carbon accumulation in a south-central Alaskan peatland assessed with novel organic geochemical techniques (2014)
    Sage
    In: Holocene
    Details
    Publication Date: 2014-08-22
    Description: To constrain the effect of climate and peatland type on carbon accumulation, we reconstructed these parameters from a Holocene-length core of a Sphagnum -dominated peatland near Cordova, AK, USA. We determined peat type using a combination of peat texture and density, macrofossils, distributions of leaf-wax biomarkers, and soil pH reconstructions based on distributions of branched glycerol dialkyl glycerol tetraether lipids (brGDGTs). We produced an independent record of hydroclimate and temperature change using hydrogen isotope ratios of leaf-wax biomarkers and distributions of brGDGTs. Carbon accumulation rates were constrained with 14 AMS 14 C dates from identified macrofossils and ash-free bulk density. In the early Holocene, the site was a shallow pond with evidence for emergent macrophytes, Sphagnum , and algae growing in a warm, moist climate. At 9.2 kyr (1 kyr = 1000 cal. yr BP), the site became a Sphagnum -dominated bog. Under mid-Holocene warm, evaporative climate conditions, the site became sedge-dominated. As climate cooled and effective precipitation increased, Sphagnum was able to gain dominance abruptly at ~3.5 kyr. Large changes in the vegetation assemblage and hydrology and climate are contemporaneous with significant changes in the rate of carbon accumulation. Carbon accumulated most rapidly when Sphagnum dominated and effective moisture was high and most slowly when sedges were dominant and conditions were warmer and drier. Estimates of future climate change indicate warmer, more evaporative conditions that, in the past, favored a sedge-dominated environment, suggesting that this peatland and those similar can contribute to a positive feedback to warming by transitioning to less efficient carbon sinks.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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  • 8
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    Wool characters in “half-bred” sheep (Border Leicester Rams x Cheviot Ewes) (With Plate V and five text-figures.) (1933)
    Cambridge University Press
    Details
    Publication Date: 1933-07-01
    Description: SummaryData from the laboratory examination of fleece samples from representative animals of the parental Border Leicester and Cheviot stock, the F1 “half-breds” and the F2 ewes, are submitted.The characters of mean fibre length, fineness and mean fibre volume are discussed, the variability found in the various types being particularly noted. The distributions of fibre lengths are also considered, it being found that all the parental forms also appear in the succeeding generations.Evidence of blending inheritance is not manifest in the results, which support the interpretation of multiple factors as responsible for the expression of the wool characters of length and fineness.Attention is called to the importance of considering fibre volumes as criteria of follicle activity.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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  • 9
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    Fertility in southdown sheep (1926)
    Cambridge University Press
    Details
    Publication Date: 1926-07-01
    Description: Data from 26 flocks, involving a total of 5014 pure-bred Southdown ewes, were available for analysis and discussion. For ewes of all ages the proportion giving birth to twins is closely associated with the total yield of lambs, and while barrenness and abortion may to a certain extent be due to the same causes, it is those factors which cause abortion which also affect the yield by reducing the number of single births, rather than the number of multiple births.The low fertility of shearling ewes is due to barrenness through reduced or delayed ovulation.The writer wishes to express his thanks to the breeders who supplied the records of their flocks and particularly to the Honorary Secretary of the Southdown Sheep Society for his help in the collection of these records.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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  • 10
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    Climate-related changes in peatland carbon accumulation during the last millennium (2012)
    Copernicus
    Details
    Publication Date: 2012-10-17
    Description: Peatlands are a major terrestrial carbon store and a persistent natural carbon sink during the Holocene, but there is considerable uncertainty over the fate of peatland carbon in a changing climate. It is generally assumed that higher temperatures will increase peat decay, causing a positive feedback to climate warming and contributing to the global positive carbon cycle feedback. Here we use a new extensive database of peat profiles across northern high latitudes to examine spatial and temporal patterns of carbon accumulation over the past millennium. Opposite to expectations, our results indicate a small negative carbon cycle feedback from past changes in the long-term accumulation rates of northern peatlands. Total carbon accumulated over the last 1000 yr is linearly related to contemporary growing season length and photosynthetically active radiation, suggesting that variability in net primary productivity is more important than decomposition in determining long-term carbon accumulation. Furthermore, northern peatland carbon sequestration rate declines over the climate transition from the Medieval Climate Anomaly (MCA) to the Little Ice Age (LIA), probably because of lower LIA temperatures combined with increased cloudiness suppressing net primary productivity. Other factors including changing moisture status, peatland distribution, fire, nitrogen deposition, permafrost thaw and methane emissions will also influence future peatland carbon cycle feedbacks, but our data suggest that the carbon sequestration rate could increase over many areas of northern peatlands.
    Print ISSN: 1810-6277
    Electronic ISSN: 1810-6285
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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