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  • 1
    Publication Date: 2000-05-29
    Description: A paramyxovirus virus termed Nipah virus has been identified as the etiologic agent of an outbreak of severe encephalitis in people with close contact exposure to pigs in Malaysia and Singapore. The outbreak was first noted in late September 1998 and by mid-June 1999, more than 265 encephalitis cases, including 105 deaths, had been reported in Malaysia, and 11 cases of encephalitis or respiratory illness with one death had been reported in Singapore. Electron microscopic, serologic, and genetic studies indicate that this virus belongs to the family Paramyxoviridae and is most closely related to the recently discovered Hendra virus. We suggest that these two viruses are representative of a new genus within the family Paramyxoviridae. Like Hendra virus, Nipah virus is unusual among the paramyxoviruses in its ability to infect and cause potentially fatal disease in a number of host species, including humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chua, K B -- Bellini, W J -- Rota, P A -- Harcourt, B H -- Tamin, A -- Lam, S K -- Ksiazek, T G -- Rollin, P E -- Zaki, S R -- Shieh, W -- Goldsmith, C S -- Gubler, D J -- Roehrig, J T -- Eaton, B -- Gould, A R -- Olson, J -- Field, H -- Daniels, P -- Ling, A E -- Peters, C J -- Anderson, L J -- Mahy, B W -- New York, N.Y. -- Science. 2000 May 26;288(5470):1432-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medical Microbiology, University of Malaya Medical Center, 50603 Kuala Lumpur, Malaysia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10827955" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Viral/blood ; Disease Outbreaks ; Encephalitis, Viral/epidemiology/*virology ; Endothelium, Vascular/pathology/virology ; Genes, Viral ; Giant Cells/pathology/virology ; Humans ; Malaysia/epidemiology ; Microscopy, Electron ; Molecular Sequence Data ; Nucleocapsid/ultrastructure ; Paramyxoviridae Infections/*epidemiology/transmission/veterinary/*virology ; *Paramyxovirinae/classification/genetics/isolation & purification/ultrastructure ; Phylogeny ; Respiratory System/virology ; Respiratory Tract Infections/epidemiology/veterinary/virology ; Sequence Analysis, DNA ; Singapore/epidemiology ; Swine ; Swine Diseases/epidemiology/virology ; Vasculitis/virology ; Viral Proteins/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 193 (1962), S. 1152-1153 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE observation of visible dust deposit around door edges suggested that there may exist a mechanism for the high concentration of dust deposits from the particulate content of air. Simple observations have now confirmed the existence of a widespread preferential deposition of radioactive fall-out ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 21 (1983), S. 179-200 
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell reports 1 (1982), S. 225-228 
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Protoplasts isolated from rapidly dividing cell suspension cultures of either Nicotiana sylvestris or tumor derived cultures of Crepis capillaris were fused by PEG or liposome treatments to form homokaryons. Analysis of binucleates by Feulgen microspectrophotometry, and autoradiography, has revealed that whereas fusion products of all cell cycle combinations occur, protoplasts of certain cycle phases participate in fusions more frequently than expected, and there is a slight predominance of “like-with-like” cycle combinations. It is argued that this tendency towards specificity of fusion may be explained by cycle related variation in surface charge on protoplasts, and the mechanisms of action of the fusogens used.
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  • 5
    ISSN: 1432-2242
    Keywords: Protoplasts ; DNA binding ; Cell cycle ; Transformation competence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The polycation mediated attachment of purified tritiated DNA to plant protoplasts has been measured by quantitative microautoradiography. The automated grain counting technique used, also provides information on the cell cycle stage of individual protoplasts, which circumvents the need to synchronize the plant cell population before preparation of protoplasts. With protoplasts from asynchronously dividing suspension cultures of Nicotiana syhestris (NS-1), S-phase protoplasts appear to be inefficient binders of 3H-DNA, as compared with G1 or G2 protoplasts. Protoplasts derived from a tumour line of Crepis capillaris (CAPT) exhibit 3H-DNA binding at all cell cycle phases, but Sphase protoplasts appear to be preferential binders. These differences are discussed with reference to cell cycle kinetics, membrane charge variation and the possibility of increasing the efficiency of genetic transformation of higher plant cells in culture.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 106 (1981), S. 1-13 
    ISSN: 1615-6102
    Keywords: Cell cycle ; Nutrient status ; Plant tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Patterns of cell cycle arrest or temporal modification have been investigated using suspension cultures ofAcer pseudoplatanus under nutrient limiting and nutrient starvation conditions. The results of nitrogen, phosphorous and carbohydrate starvation have been compared and contrasted with reference to the Principal Control Point hypothesis ofVan't Hof andKovacs (1972). Whilst cells suffering phosphorus or carbohydrate starvation arrest in the G 1 and G 2 phases in the approximate ratio of 4 to 1, nitrogen starved cells accumulate virtually exclusively in G 1.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1615-6102
    Keywords: Crepis capillaris ; Cell cycle ; Tumour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Analysis of the cell cycle by three methods has revealed unusual kinetics of proliferation in tumour derived suspensions ofCrepis capillaris. The different methods of analysis yield different estimates of cycle phase durations, and such discrepancies have been explained in terms of low growth fractions with rapid total cycle traverse. Specifically, confidence in the estimation of G2 duration by the fraction of labelled mitosis analysis, and comparison with shorter G2 estimates obtained by the two other methods, suggests that cells drop out in G1. However, cells which do not drop out of the proliferative compartment traverse G1 extremely rapidly. Extremely short cell cycle durations in which the G1 phase is virtually non-existent are uncharacteristic of plant cell suspension cultures, in which the G1 phase has previously been shown to be extended as compared with meristematic root tip cells. A model has been proposed in which a central core of rapidly dividing cells continuously loses cells into a subpopulation of resting or G0 cells with the G1 DNA content. Similarities between plant and animal tumours with respect to cell growth and division are discussed.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1615-6102
    Keywords: Cell cycle ; Membrane charge ; Nicotiana ; Plant protoplasts ; Tobacco mosaic virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Attachment of virions of tobacco mosaic virus to protoplasts isolated from dividing suspension cultured cells ofNicotiana sylvestris was estimated using quantitative autoradiography of individual protoplasts. Additionally, the position of each protoplast in the cell cycle was assessed by Feulgen microspectrophotometry. At pH 5.6, after preincubation with 4 μg 1−1 poly-L-ornithine, protoplasts in the G1 and G2 phases bound more virions than protoplasts in the S-phase. The possibility that such differential binding was caused by cyclical variation in the net charge on the protoplast membrane has been investigated. It was found that S-phase protoplasts ofN. sylvestris can be separarated from protoplasts of other cycle stages by partition in aqueous, two-phase, immiscible polymer systems, presumably because they differ in charge. Also, electrophoretic studies suggest that G1 phase protoplasts bear higher surface charge than some non-G1 protoplasts.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 106 (1981), S. 23-35 
    ISSN: 1615-6102
    Keywords: Cell cycle ; Cytokinin ; Hormone action ; Plant tissue culture ; Synchrony
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The effects of 6-benzylaminopurine (BAP) withdrawal and re-application on a cytokinin-dependent suspension culture of soybean, have been examined. Data obtained from a detailed analysis of mitotic activity, cell number fluctuation and cellular DNA content, support the conclusion that, in this tissue, cytokinin deprivation does not cause arrest at any particular point in the cell cycle. Results presented here, and in the previous paper (Everett et al.), emphasize the importance in analyses of cell population kinetics of distinguishing between true cell cycle synchrony, periodic division and growth, and mitotic oscillation.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 106 (1981), S. 15-22 
    ISSN: 1615-6102
    Keywords: Auxin ; Cell cycle ; Hormone action ; Plant tissue culture ; Synchrony
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When suspension-cultured sycamore (Acer pseudoplatanus L.) cells are deprived of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) cell division activity ceases after a brief period of exponential growth. Feulgen microdensitometry analyses showed that sycamore cultures starved of 2,4-D do not exhibit exclusive arrest in any particular cell cycle compartment. Regrowth, following readdition of 2,4-D to 2,4-D-starved cells, produced periodic oscillations in mitotic index and discontinuous increases in cell number. Detailed characteristics of the regrowth kinetics indicated involvement of periodic, rather than synchronous, growth. The results of this study suggest that the stimulation of cell division by 2,4-D is indirect and not due to the activation of a cell cycle control point to commit cells to division.
    Type of Medium: Electronic Resource
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