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  • Articles  (5,138)
  • 2020-2023
  • 2020-2020
  • 1995-1999  (5,138)
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  • 1996  (5,138)
  • Medicine  (5,138)
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  • Articles  (5,138)
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  • 2020-2023
  • 2020-2020
  • 1995-1999  (5,138)
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  • 1965-1969
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  • 1
    Electronic Resource
    Electronic Resource
    Analytical Characterization of Peptide Contaminants of L-Tryptophan (1996)
    Springer
    Archives of environmental contamination and toxicology 30 (1996), S. 142-148 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. Reversed-phase liquid chromatographic fractions of extracts of 2 preparations of eosinophilia-myalgia syndrome (EMS)-associated L-tryptophan were analyzed by proton nuclear magnetic resonance spectrometry, mass spectrometry, microbial-growth inhibition, and amino acid residue analyses. Fraction components demonstrated properties of an antibiotic peptide resembling bacitracin. Many peptide antibiotics like bacitracin are secondary metabolites of Bacillus species, genus of the tryptophan producer organism for the implicated manufacturer. In order to determine whether a correlation exists between individual EMS cases and the concentration of peptides or bacitracin consumed, reliable methods must be developed for quantification of the total of isoforms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900020
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  • 2
    Electronic Resource
    Electronic Resource
    Analytical characterization of peptide contaminants of L-tryptophan (1996)
    Springer
    Archives of environmental contamination and toxicology 30 (1996), S. 142-148 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Reversed-phase liquid chromatographic fractions of extracts of 2 preparations of eosinophilia-myalgia syndrome (EMS)-associated L-tryptophan were analyzed by proton nuclear magnetic resonance spectrometry, mass spectrometry, microbial-growth inhibition, and amino acid residue analyses. Fraction components demonstrated properties of an antibiotic peptide resembling bacitracin. Many peptide antibiotics like bacitracin are secondary metabolites of Bacillus species, genus of the tryptophan producer organism for the implicated manufacturer. In order to determine whether a correlation exists between individual EMS cases and the concentration of peptides or bacitracin consumed, reliable methods must be developed for quantification of the total of isoforms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211341
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  • 3
    Electronic Resource
    Electronic Resource
    Efficacy of a therapeutic cocaine vaccine in rodent models (1996)
    [s.l.] : Nature Publishing Group
    Nature medicine 2 (1996), S. 1129-1132 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Cocaine abuse is a major medical and public health concern in the United States, with approximately 2.1 million people dependent on cocaine1. Pharmacological approaches to the treatment of cocaine addiction have thus far been disappointing2,3, and new therapies are urgently needed. This paper ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm1096-1129
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  • 4
    Electronic Resource
    Electronic Resource
    Photofrin-mediated photodynamic therapy of rat palatal mucosa: Normal tissue effects and light dosimetry (1996)
    Springer
    Lasers in medical science 11 (1996), S. 163-174 
    Details
    ISSN: 1435-604X
    Keywords: Photodynamic therapy ; Photofrin ; Oral mucosa ; Normal tissue damage ; Light dosimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics , Technology
    Notes: Abstract Photodynamic therapy (PDT) is a treatment modality with potential application for premalignant lesions and squamous cell carcinoma of the oral mucosa. PDT in principle has dual selectivity. This may result from a ‘preferential’ retention of the photosensitizer in target tissue. In addition, the photodynamic activity will be limited to the irradiated area because PDT will not affect tissues in the absence of excitation light. The specificity of PDT is limited by the fact that normal tissues also retain the photosensitizer to some degree, which makes these tissues susceptible to PDT damage. To optimize PDT for oral malignancies, a study was undertaken on normal tissue to investigate the responses in rat palatal mucosa and surrounding anatomical structures. Eighty male Wistar rats were used in the study. Photofrin was administered i.v. at four doses (0, 2.5, 5 or 10 mg kg−1 body weight). Irradiation for PDT was performed 24 h later. An argon pumped dye laser system was used to produce light of two different treatment wavelengths (514.5 and 625 nm), and various energy density levels (0, 25, 50, 100 or 200 J cm−2). Early effects of PDT were studied at 2 days and late effects at 2 months after treatment. Twenty-four hours after i.v. administration of Photofrin, it was found that PDT affects normal tissues of the oral cavity both macroscopically and microscopically. Combinations of photosensitizer doses ≥5 mg kg−1 and light doses≥100 J cm−2 caused severe and permanent damage to the palatal mucosa and adjacent normal structures such as palatal bone and dentition. Light scattering and internal reflection usually raise the fluence rate in tissue above the irradiance of the incident beam. In an additional study using six male Wistar rats, the energy fluence rate at two treatment wavelengths (514.5 and 625 nm) was measured ex vivo in the palatal mucosa and adjacent anatomical structures. As expected, the energy fluence rates were wavelength, tissue and depth dependent. At the air-mucosa boundary, light of 625 nm was found to have a three-times higher fluence rate than the primary incident beam. Under similar conditions, the fluence rate of 514.5 nm was found to be less, but still twice as high as the primary incident beam. At deeper levels of the rat maxilla, fluence rates were still elevated compared with the incident beam. For 625 nm light, this phenomenon was observed up to the level of the nasal cavity. These increased fluence rates could largely explain the pattern of damage to normal mucosa and surrounding anatomical structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02156758
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  • 5
    Electronic Resource
    Electronic Resource
    Mutagenicity of Organic Pollutants and Their Active Components in the Xi River Water at Shenyang (1996)
    Springer
    Bulletin of environmental contamination and toxicology 56 (1996), S. 803 -808 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900117
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  • 6
    Electronic Resource
    Electronic Resource
    Practical experience and issues in designing and performing population pharmacokinetic/pharmacodynamic studies (1996)
    Springer
    European journal of clinical pharmacology 49 (1996), S. 251-254 
    Details
    ISSN: 1432-1041
    Keywords: Population pharmacokinetics ; Pharmacodynamics ; experimental design ; drug development ; clinical trials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract An expert meeting to discuss issues relating to the design of population pharmacokinetic/pharmacodynamic (PK/PD) studies was held in Brussels in March 1995, under the auspices of the European Co-operation in Science and Technology (COST), Medicine (B1) programme. The purpose of the meeting was to discuss the experts' experience in designing and performing population PK/PD studies. The topics discussed were current practice, logistical issues, ensuring the accuracy of data, covariate assessment, communication, and protocol design. The main conclusions from the meeting were: 1) a population PK/PD analysis should be one of the objectives of a clinical trial and should not compromise the other objectives; 2) it is particularly important to communicate the purpose of the population PK/PD analysis to the investigators and to convince them of the importance of accurately recording dosing and sampling times; 3) some prior knowledge of the PK and PD models and covariate relationships is necessary for the analysis of sparse phase III data; 4) computer simulation and optimal design measures may be useful in defining sampling times; 5) population methods and objectives must be specified as completely as possible in the protocol. Participants: L. Aarons (UK), L. Balant (Switzerland), P. Bechtel (France), R. Bruno (France), P. Burtin (Switzerland), C. Dubruc (France), E. Fuseau (UK), J. Gabrielsson (Sweden), U. Gundert-Remy (Germany), R. Jochemsen (France), M. Karlsson (Sweden), C. Laveille (France), I. Meineke (Germany), F. Mentré (France), P. Morselli (France), G. Paintaud (France), A. Racine-Poon (Switzerland), J. Rodriguez (Spain), F. Rombout (The Netherlands), M. Rowland (UK), J.-L. Steimer (Switzerland), A. Van Peer (Belgium), S. Vozeh (Switzerland), W. Weber (Germany), B. Wittke (Switzerland) The views expressed by the participants do not necessarily reflect those of the organizations they represent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226323
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  • 7
    Electronic Resource
    Electronic Resource
    Practical experience and issues in designing and performing population pharmacokinetic/pharmacodynamic studies (1996)
    Springer
    European journal of clinical pharmacology 49 (1996), S. 251-254 
    Details
    ISSN: 1432-1041
    Keywords: Key words Population pharmacokinetics ; Pharmacodynamics; experimental design ; drug development ; clinical trials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract An expert meeting to discuss issues relating to the design of population pharmacokinetic/pharmacodynamic (PK/PD) studies was held in Brussels in March 1995, under the auspices of the European Co-operation in Science and Technology (COST), Medicine (B1) programme. The purpose of the meeting was to discuss the experts’ experience in designing and performing population PK/PD studies. The topics discussed were current practice, logistical issues, ensuring the accuracy of data, covariate assessment, communication, and protocol design. The main conclusions from the meeting were: 1) a population PK/PD analysis should be one of the objectives of a clinical trial and should not compromise the other objectives; 2) it is particularly important to communicate the purpose of the population PK/PD analysis to the investigators and to convince them of the importance of accurately recording dosing and sampling times; 3) some prior knowledge of the PK and PD models and covariate relationships is necessary for the analysis of sparse phase III data; 4) computer simulation and optimal design measures may be useful in defining sampling times; 5) population methods and objectives must be specified as completely as possible in the protocol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226323
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  • 8
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    Antiviral effect and ex vivo CD4+ T cell proliferation in HIV-positive patients as a result of CD28 costimulation (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-06-28
    Description: Because stimulation of CD4+ lymphocytes leads to activation of human immunodeficiency virus-type 1 (HIV-1) replication, viral spread, and cell death, adoptive CD4+ T cell therapy has not been possible. When antigen and CD28 receptors on cultured T cells were stimulated by monoclonal antibodies (mAbs) to CD3 and CD28 that had been immobilized, there was an increase in the number of polyclonal CD4+ T cells from HIV-infected donors. Activated cells predominantly secreted cytokines associated with T helper cell type 1 function. The HIV-1 viral load declined in the absence of antiretroviral agents. Moreover, CD28 stimulation of CD4+ T cells from uninfected donors rendered these cells highly resistant to HIV-1 infection. Immobilization of CD28 mAb was crucial to the development of HIV resistance, as cells stimulated with soluble CD28 mAb were highly susceptible to HIV infection. The CD28-mediated antiviral effect occurred early in the viral life cycle, before HIV-1 DNA integration. These data may facilitate immune reconstitution and gene therapy approaches in persons with HIV infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levine, B L -- Mosca, J D -- Riley, J L -- Carroll, R G -- Vahey, M T -- Jagodzinski, L L -- Wagner, K F -- Mayers, D L -- Burke, D S -- Weislow, O S -- St Louis, D C -- June, C H -- AI29331/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1996 Jun 28;272(5270):1939-43.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Naval Medical Research Institute, Bethesda, Maryland 20889, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8658167" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies, Monoclonal/immunology ; Antigens, CD28/*immunology ; Antigens, CD3/immunology ; CD4 Lymphocyte Count ; CD4-Positive T-Lymphocytes/cytology/*immunology/*virology ; Cell Division ; Cells, Cultured ; Chemokines/metabolism ; Cytokines/metabolism ; HIV Infections/immunology/*virology ; HIV-1/immunology/*physiology ; Humans ; Interleukin-2/pharmacology ; *Lymphocyte Activation ; Phytohemagglutinins/pharmacology ; Virus Integration ; Virus Replication
    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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  • 9
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    Analytical characterization of peptide contaminants of L-tryptophan (1996)
    Springer
    Details
    Publication Date: 1996-01-01
    Print ISSN: 0090-4341
    Electronic ISSN: 1432-0703
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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  • 10
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    Analytical Characterization of Peptide Contaminants of L-Tryptophan (1996)
    Springer
    Details
    Publication Date: 1996-01-01
    Print ISSN: 0090-4341
    Electronic ISSN: 1432-0703
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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