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  • Biochemistry and Biotechnology  (3)
  • Immunohistochemistry  (2)
  • 1985-1989  (5)
  • 1920-1924
  • 1
    Electronic Resource
    Electronic Resource
    Continuous production of maltotetraose using immobilized Pseudomonas stutzeri amylase (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 32 (1988), S. 669-676 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A continuous production process of maltotetraose was investigated by using immobilized maltotetraose (G4)- forming amylase (1,4-α-D-glucan maltotetraohydrolase, EC3.2.1.60) from Pseudomonas stutzeri adsorbed on a macroporous hydrophobic resin. The maximum reaction rate was obtained at 55°C and the activation energy of hydrolysis by immobilized G4-forming amylase was calculated to be 8.45 kcal/mol. The maltotetraose yield was greatly influenced by the flow rate of substrate solution, its concentration, and the immobilized enzyme activity. The newly defined factor “specific space velocity” was successfully introduced to normalize the operating parameters. Using this factor, the immobilized enzyme reactor then can be simulated and the operating dynamics can be determined.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260320512
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  • 2
    Electronic Resource
    Electronic Resource
    Stability of immobilized maltotetraose-forming amylase from Pseudomonas stutzeri (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 33 (1989), S. 845-855 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The stability of immobilized maltotetraose (G4)-forming amylase (1,4-α-D-glucan maltoteraohydrolase, EC 3.2.1.60) from Pseudomonas stutzeri was investigated in both batch and continous processes. The inactivation process of the immobilized enzyme seemed to obey first-order kinetics, and the immobilized enzyme became more stable when coexisting with 20-30 wt % substrate and calcium ions. From intensive studies on the operational stability in the continuous process, the apparent half-life of G4 productivity in a constant-flow system was mainly affected by the reaction temperature, substrate concentration, and initial immobilized enzyme activity. A new factor, immobilized enzyme stability factor fs, was proposed to evaluate the half-life of the immobilized enzyme system.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260330708
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  • 3
    Electronic Resource
    Electronic Resource
    Depolymerization of chondroitin C Sulfate by immobilized Proteus vulgaris cells (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1707-1712 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Chondroitinase ABC catalyzing the depolymerization of chondroitin sulfate was induced by incubating the Proteus vulgaris cells in a medium containing chondroitin C sulfate as an inducer. Incubation of P. vulgaris cells for 12 h in the presence of 0.3% inducer was optimal to obtain the cells with highly active chondroitinase ABC. Such cells were immobilized in k-carrageenan gel lattice, and some properties of chondroitinase ABC in immobilized cells were studied in comparison with those of the enzyme without immobilization (free enzyme). The stabilities of the enzyme toward heat and storage were remarkably improved by immobilizing the cells in k-carrageenan gel lattice. Optimal pH and temperature for activity of the enzyme were slightly shifted to the alkaline region and higher temperature by immobilization and were 9.0 and 35°C, respectively.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260281114
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  • 4
    Electronic Resource
    Electronic Resource
    Glucagon-related peptides in the rat hypothalamus (1986)
    Springer
    Cell & tissue research 246 (1986), S. 71-75 
    Details
    ISSN: 1432-0878
    Keywords: Glucagon-related peptides ; Rat hypothalamus ; Radioimmunochemistry ; Immunohistochemistry ; Food deprivation ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Immunohistochemically, nerve fibers and terminals reacting with anti-N-terminal-specific but not with anti-C-terminal-specific glucagon antiserum were observed in the following rat hypothalamic regions: paraventricular nucleus, supraoptic nucleus, anterior hypothalamus, arcuate nucleus, ventromedial hypothalamic nucleus and median eminence. Few fibers and terminals were demonstrated in the lateral hypothalamic area and dorsomedial hypothalamic nucleus. Radioimmunoassay data indicated that the concentration of gut glucagon-like immunoreactivity was higher in the ventromedial nucleus than in the lateral hypothalamic area. In food-deprived conditions, this concentration increased in both these parts. This was also verified in immunostained preparations in which a marked enhancement of gut glucagon-like immunoreactivity-containing fibers and terminals was observed in many hypothalamic regions. Several immunoreactive cell bodies were found in the ventromedial and arcuate nuclei of starved rats. Both biochemical and morphological data suggest that glucagon-related peptides may act as neurotransmitters or neuromodulators in the hypothalamus and may be involved in the central regulatory mechanism related to feeding behavior and energy metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219001
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  • 5
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    Perivascular microglial cells of the CNS are bone marrow-derived and present antigen in vivo (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-01-15
    Description: A crucial question in the study of immunological reactions in the central nervous system (CNS) concerns the identity of the parenchymal cells that function as the antigen-presenting cells in that organ. Rat bone marrow chimeras and encephalitogenic, major histocompatability--restricted T-helper lymphocytes were used to show that a subset of endogenous CNS cells, commonly termed "perivascular microglial cells," is bone marrow-derived. In addition, these perivascular cells are fully competent to present antigen to lymphocytes in an appropriately restricted manner. These findings are important for bone marrow transplantation and for neuroimmunological diseases such as multiple sclerosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hickey, W F -- Kimura, H -- KO7-NS0087/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jan 15;239(4837):290-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104-6079.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3276004" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigen-Presenting Cells/*immunology ; Astrocytes/immunology ; Bone Marrow/*immunology ; Bone Marrow Transplantation ; Central Nervous System/blood supply/*immunology/pathology ; Chimera ; Encephalomyelitis, Autoimmune, Experimental/immunology/pathology ; Endothelium/immunology ; Graft vs Host Disease/immunology ; Histocompatibility Antigens/analysis/immunology ; Immunohistochemistry ; Multiple Sclerosis/immunology/pathology ; Neuroglia/*immunology ; Rats ; Rats, Inbred Lew ; T-Lymphocytes/immunology
    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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