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  • Polymer and Materials Science  (3)
  • Humans  (2)
  • Chloroplast (glutamate synthase)  (1)
  • Horizontal to vertical spectral ratio
  • Modelling
  • 2000-2004
  • 1985-1989  (6)
  • 1985  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Glutamate synthase in greening callus of Bouvardia ternifolia Schlecht (1985)
    Springer
    Planta 163 (1985), S. 448-452 
    Details
    ISSN: 1432-2048
    Keywords: Bouvardia ; Callus tissue ; Chloroplast (glutamate synthase) ; Ferredoxin ; Glutamate synthase ; Greening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of the two glutamate-synthase (GOGAT) activities known to exist in higher plants (NADH dependent, EC 2.6.1.53; and ferredoxin dependent, EC 1.4.7.1) was studied in non-chlorophyllous and chlorophyllous cultured tissue as well as in young leaves of Bouvardia ternifolia. The NADH-GOGAT was present in all three tissues. Using a sucrose gradient we found it in both the soluble and the plastid fraction of non-chlorophyllous and chlorophyllous tissue, but exclusively in the chloroplast fraction of the leaves. Ferredoxin-GOGAT was found only in green tissues and was confined to the chloroplasts. Ferredoxin-GOGAT activity increased in parallel with the chlorophyll content of the callus during the greening process in Murashige-Skoog medium (nitrate and ammonium as the nitrogen sources), while NADH-GOGAT was not affected by the greening process in this medium. Furthermore, both activities were differentially affected by either nitrate or ammonium as the sole nitrogen source in the medium during this process. It is suggested that each GOGAT activity is a different entity or is differently regulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392701
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  • 2
    Electronic Resource
    Electronic Resource
    Water-insoluble dextrans by grafting, 2Part 1: cf.3.. Reaction of dextrans with n-alkyl chloroformates. Chemical and enzymatic hydrolysis (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 17-29 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: This work deals with the modification reaction of dextran with ethyl and butyl chloroformate using tertiary amines as catalyst/acceptor systems and the DMF/LiCl system as solvent. The structure of the resulting polymers was determined by means of IR, 1H and 13C NMR spectroscopy as well as by chemical analyses. The reaction rate was found to increase in the following order: N,N′-dimethylaniline 〈 pyridine 〈 triethylamine. The presence of cyclic carbonates was observed when triethylamine was used as catalyst. A linear dependence of the reaction rate on polymer and pyridine concentrations and a more complex dependence on the n-alkyl chloroformate concentration were found. Reaction rate and yield decrease with increasing amount of LiCl in the solvent medium and increase with increasing chain length of the n-alkyl chloroformate. The activation energy was found to be 64 kJ/mol (15,3 kcal/mol). The equilibrium water content (EWC) values decreases progressively when either the content of carbonate groups or the side chain length increases. The hydrolysis in the heterogeneous phase showed that the time required for the polymer solubilization is dependent upon the nature of the carbonate groups, the temperature as well as the pH value of the medium. Dextranase was found to be inactive in the hydrolysis of water-insoluble modified dextrans. However, the hydrolysis takes place when water-soluble modified dextrans were used.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860103
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  • 3
    Electronic Resource
    Electronic Resource
    Release of sodium salicylate from vinyl alcohol/n-alkyl vinyl carbonate copolymers (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 2117-2123 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: This study is concerned with the sodium salicylate release from thin discs of vinyl alcohol/n-alkyl vinyl carbonate copolymers into an aqueous medium under sink conditions. The drug content of the disc decreases with pseudo-first order rate initially, whereas the drug quantity released is proportional to the square root of time. Data analysis supported the latter treatment, which is in agreement with the diffusional matrix model and invalidates the pseudo-first order assumption. The diffusion coefficient D of vinyl alcohol/ethyl vinyl carbonate copolymers decreases with increasing ethyl vinyl carbonate content whilst D increases as both sodium salicylate concentration and temperature increase. The activation energy of diffusion was found to be 46,03 kJ/mol (11,00 kcal/mol).
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021861015
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  • 4
    Electronic Resource
    Electronic Resource
    Chemical heterogeneity of a partially modified dextran with ethyl carbonate groups (1985)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 135 (1985), S. 139-149 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Probe von mit Ethylcarbonatgruppen teilweise modifiziertem Dextran wurde kreuz-fraktioniert. Auf der Basis von Trübungspunkt-Messungen wurden zwei Systeme gewählt: THF/Hexan und DMF/0,5 proz. wässerige NaCl-Lösungen. Die chemische Zusammensetzung (CCD) und die Molekulargewichtsverteilung (MWD) wurden den Fraktionierungsdaten entnommen. Die beobachtete chemische Heterogenität kann mit der Art des Reaktionsmechanismus von Dextran und Ethylchlorformiat korreliert werden. Die kumulativen Fraktionierungsdaten wurden nach den Zwei-Parameter-Funktionen von Tung und Wesslau angepasst.
    Notes: A sample of a partially modified dextran with ethyl carbonate groups was fractionated by cross-fractionation. Two systems THF/hexane and DMF/0.5% aqueous NaCl were selected on the basis of cloud-point determinations. The chemical composition distribution (CCD) and molecular weight distribution (MWD) curves were constructed from fractionation data. The chemical heterogeneity observed may be correlated with the pattern of reaction of dextran with ethyl chloroformate. The cumulative data were fitted by the two-parameter MWD functions of Tung and of Wesslau.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1985.051350112
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  • 5
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    Cassette of eight exons shared by genes for LDL receptor and EGF precursor (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-05-17
    Description: The amino acid sequences of the human low-density lipoprotein (LDL) receptor and the human precursor for epidermal growth factor (EGF) show 33 percent identity over a stretch of 400 residues. This region of homologous is encoded by eight contiguous exons in each respective gene. Of the nine introns that separate these exons, five are located in identical positions in the two protein sequences. This finding suggests that the homologous region may have resulted from a duplication of an ancestral gene and that the two genes evolved further by recruitment of exons from other genes, which provided the specific functional domains of the LDL receptor and the EGF precursor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sudhof, T C -- Russell, D W -- Goldstein, J L -- Brown, M S -- Sanchez-Pescador, R -- Bell, G I -- HL 01287/HL/NHLBI NIH HHS/ -- HL 20948/HL/NHLBI NIH HHS/ -- HL 31346/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1985 May 17;228(4701):893-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3873704" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Base Sequence ; Biological Evolution ; Cloning, Molecular ; Epidermal Growth Factor/*genetics ; Genes ; Humans ; Protein Precursors/genetics ; Receptors, LDL/*genetics ; Repetitive Sequences, Nucleic Acid
    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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  • 6
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    Nucleotide sequence and expression of an AIDS-associated retrovirus (ARV-2) (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-02-01
    Description: The nucleotide sequence of molecular clones of DNA from a retrovirus, ARV-2, associated with the acquired immune deficiency syndrome (AIDS) was determined. Proviral DNA of ARV-2 (9737 base pairs) has long terminal repeat structures (636 base pairs) and long open reading frames encoding gag (506 codons), pol (1003 codons), and env (863 codons) genes. Two additional open reading frames were identified. Significant amino acid homology with several other retroviruses was noted in the predicted product of gag and pol, but ARV-2 was as closely related to murine and avian retroviruses as it was to human T-cell leukemia viruses (HTLV-I and HTLV-II). By means of an SV-40 vector in transfected simian cells, the cloned gag and env genes of ARV-2 were shown to express viral proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanchez-Pescador, R -- Power, M D -- Barr, P J -- Steimer, K S -- Stempien, M M -- Brown-Shimer, S L -- Gee, W W -- Renard, A -- Randolph, A -- Levy, J A -- New York, N.Y. -- Science. 1985 Feb 1;227(4686):484-92.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2578227" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/*microbiology ; Amino Acid Sequence ; Base Sequence ; Cloning, Molecular ; Codon ; DNA, Viral/*genetics ; Deltaretrovirus/genetics ; Gene Products, gag ; Genes, Viral ; Humans ; Nucleic Acid Conformation ; RNA-Directed DNA Polymerase/biosynthesis/genetics ; Repetitive Sequences, Nucleic Acid ; Retroviridae/*genetics ; Viral Envelope Proteins/biosynthesis/genetics ; Viral Proteins/biosynthesis/*genetics
    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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