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  • Articles  (31,629)
  • 1980-1984  (31,629)
  • 1981  (31,629)
  • Medicine  (30,304)
  • History  (1,325)
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  • Articles  (31,629)
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  • 1980-1984  (31,629)
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  • 1
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Five human teratoma cell lines have been characterized for the presence of a certain number of marker antigens whose presence or absence has been shown to be characteristic of mouse embryonal carcinoma (EC) cells. Four out of the five lines have been shown to respond to at least some of the criteria associated with murine EC cells even though only limited in vitro differentiation could be demonstrated. The significance of certain unusual marker antigen combinations present on the cell line Tera I and its clones and so far unobserved for the murine model is discussed. The observation in Tera I populations of cells carrying simultaneously both the F9 and β2-microglobulin or HLA antigens, suggest that the human cell lines may represent a novel material for the study of mammalian differentiation.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Principles of Gene Manipulation. Studies in Microbiology
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Serum IgG (7S) levels differed significantly for chickens from 10 different inbred lines. Within lines differences between B blood groups were statistically significant.The genetic control of serum IgG was further examined using birds from B complex haplotypes marked at the B locus and the Ir-GAT locus. Birds from each of five subgroup haplotypes (B1B1Ir-GAT-Lo and -Hi, B19B19Ir-GAT-Lo and -Hi, and B2B2Ir-GAT intermediate) were tested for levels of serum IgG at 3, 6, 9, and 21 weeks of age. The rate and level of IgG reached in the serum was more than two-fold greater in the GAT-Hi birds than in the GAT-Lo. The Ir region of the B complex exerts some control over the ontogenesis of IgG, though most of the genetic variation seems not to be B complex associated.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Dorso-ventral vaginal septa were observed in congenic mouse strains. Strain C57BL/10Sn, H-2b, had the highest frequency, 22%; B10.A/SgSn, H-2a, had the lowest frequency, 4%, P 〈0.001. The frequency was about 17% in the F1, females. Septa were found in 16% and 15% of the B10.D2/nSn and B10.BR/SgSn strains, respectively, indicating that at least two loci within the H-2 complex influence its frequency.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The phylogenetic distribution of antigens present on human lymphocytes was investigated by incubating human or simian cells with murine anti-human monoclonal antibodies and then determining the level of reactivity with a radiolabelled anti-murine IgG reagent. The monoclonal antibodies used were specific for a T-cell antigen, lymphoid and lymphoid:myeloid antigens, Ia antigens, and β2 microglobulin. The cells examined included B- and T-lymphoblastoid cell lines and fresh peripheral blood lymphocytes separated by sheep erythrocyte rosetting into T-cell and non T-cell fractions. Results of these studies showed that the antibodies gave complete cross-reactivity with gorilla and chimpanzee cells while B-cell lines of orangutan origin had lost lymphoid and β2 microglobulin markers. Gibbon cells and cells of Old World and New World monkeys reacted strongly only with monoclonal antibodies against Ia antigenic determinants. These Ia antigens were found on the non T-cell fraction of fresh peripheral lymphocytes, on B-cell lines and on some virus induced T-cell tumour lines. Immunoprecipitation analysis using the anti-Ia antibodies showed a degree of molecular diversity on owl monkey and marmoset cells compared to the Ia antigens associated with human cells.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: C3H/HeN x NZB/BIN F1 mice were primed and challenged with DNP-Ficoll, a thymic independent (TI-2) antigen. They developed strong IgM and IgG carrier-specific memory responses: DNP-pneumococcal polysaccharide or DNP-haemocyanin challenge did not elicit memory responses. The IgG response component appeared to be inherited dominantly from the C3H/HeN parent. The IgM component resulted from genetic enhancement.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The effect of incompatibility for Mls determinants was studied in lethal graft-versus-host reaction (GVHR) in the mouse. GVHR was induced in adult recipients of the following H-2k strains: (AKR x B10.BR)F1 (MlsB/Mlsb); (C3H x B10.BR)F1 (Mlsc/Mlsb); (CBA/J x B10.BR)F1 (Mlsd/Mlsb) and (CBA/H x B10.BR)F1 (Mlsb). Recipient mice were heavily irradiated and grafted with bone marrow and spleen cells from H-2 compatible B10.BR (H-2k, Mlsb) or H-2 incompatible B10.D2 and B10 donors were normal, while those from B10.BR donors were either normal or pre-immunized against the recipient strains. In all experiments the survival of recipients with Mlsa/Mlsb and Mlsd/Mlsb phenotypes, and only in one experiment of those with Mlsc/Mlsb phenotype was greater and/or the survival time longer than that of recipients expressing only Mlsb. However, late deaths (〉 120 days post grafting) observed after grafting of normal B10.BR cells were more frequent in Mlsd/Mlsb than in Mlsb strains. On the other hand, when B10.BR donor cells were pre-immunized against H-2k compatible (AKR x B10.BR)F1 (Mlsa/Mlsb) or (CBA/J x B10.BR)F1 (Mlsd/Mlsb) strains, the survival time of H-2 incompatible (B10 x B10.BR)F1 (H-2b/k, Mlsb) recipients was longer than when donor cells were pre-immunized against (CBA/H x B10.BR)F1 (Mlsb) strain. We conclude that donor incompatibility for Mlsa or Mlsd or donor-pre-immunization against Mlsa or Mlsd exerts a protective effect on lethal GVHR developed across non-H-2 or H-2 barriers; the protective effect of Mlsc is less efficient or absent. The Mls-induced protective effect shows the following properties: (a) efficiency in vivo correlates with the capacity of the corresponding alleles to stimulate an in vitro MLR; (b) is efficient in either primary or secondary response to other minor antigens; (c) is not H-2 restricted; (d) is nonspecific; (e) disappears late after grafting; (f) with respect to the genetic background, the early protective effect is followed, late after grafting, by an opposite effect which increases the mortality, suggesting that M/s locus determinants are capable of activating several cell populations with different biological functions.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A long-term in vitro grown T cell line derived from a cotton-topped marmoset (Saguinus oedipus)) infected with Herpesvirus saimiri was found to share surface antigens with human amplifier T cells and to augment the capacity of human B cells to secrete immunoglobulin. This is the first demonstration of T/B collaboration across such a large phylogenetic barrier and might have interesting implications for understanding the nature of molecular interactions mediating cell/cell cooperation.
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The segregation of genes controlling ECIA susceptibility and the level of immune response to native calf type II collagen were determined in the F2 progeny of matings between WF (RTIu/u; ECIA-susceptible; high responders) and LEW.B3 (RT1n/n; ECIA-resistant; low to intermediate responders). RT1n/n F2 progeny showed resistance to ECIA, low skin test reactivity to type II collagen and intermediate levels of IgG anti-collagen antibodies (-log2 of 6.2 ± 2.6; mean ± SD, n= 10). RT1u/u and RT1u/u F2 progeny were susceptible to ECIA and were high responders to type II collagen by skin testing and IgG antibody titres (-log2 of 12.1 ± 1.3, mean ± SD, n= 26). Although all rats that developed arthritis were also high responders to type II collagen one group of immature F2 progeny, RT1u/u and RT1u/n, showed high anti-collagen immune responses in the absence of detectable arthritis. The data indicate that genes linked to RT1.A control susceptibility to ECIA and at least part of the immune response to native calf type II collagen in WF and LEW.B3 rats.
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  • 10
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Mice bearing the I-A subregion mutation bm12 were immunized and challenged with the α-subunit of human adult haemoglobin. Under conditions in which parental B6/Kh mice respond, B6.C-H-2bm12 mice are inhibited nearly 100% in their ability to respond to challenge to the α-chain of haemoglobin. D2.GD mice which express a variant Ae (Eβ) polypeptide of the I-E subregion can respond as well as B10.D2 mice to both subunits (α- and β-) of haemoglobin. These observations as well as other genetic mapping data confirm the I-A mapping of α-chain-specific Ir genes and extend the genetic fine mapping to the Aβ gene within the I-A subregion or a combinatorial Ia determinant generated by an interaction of Aα and Aβ. In addition they implicate the Ia.8 specificity in determining immune responsiveness to α-chain determinants.
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