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  • Biochemistry and Biotechnology  (2)
  • Diabetes mellitus  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Small intestinal morphology in experimental diabetic rats: a stereological study on the effects of an aldose reductase inhibitor (ponalrestat) given with or without conventional insulin therapy (1989)
    Springer
    Diabetologia 32 (1989), S. 649-654 
    Details
    ISSN: 1432-0428
    Keywords: Diabetes mellitus ; insulin injection ; aldose reductase inhibitor ; small intestine ; villi ; crypts ; muscularis externa ; stereology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The gross and microscopical dimensions of small intestines from 12-week old streptozotocin-diabetic rats receiving no therapeutic intervention were compared with those from animals receiving insulin alone or in conjunction with the aldose reductase inhibitor, ponalrestat. Four regions along each intestine were analysed stereologically. Insulin had significant beneficial effects on body weight as well as on intestinal length, width, surface area and volume. In contrast, ponalrestat did not improve body weight deficits and was associated with crypt hypertrophy and a reduced villous surface/crypt volume ratio. There were interaction effects between insulin and ponalrestat for intestinal length and primary mucosal surface area. All groups displayed significant regional differences in surface area of primary mucosa and volume of muscularis externa. Only untreated diabetic rats failed to reveal regional variation in the surface area and volume of villi. Ratios of villous surface area/crypt volume varied from region-to-region in insulin-treated diabetic rats but not in other groups. The study fails to reveal any beneficial effect of aldose reductase inhibition on the changes in intestinal morphology seen in experimental diabetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274251
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Endoneurial localisation of microvascular damage in human diabetic neuropathy (1993)
    Springer
    Diabetologia 36 (1993), S. 454-459 
    Details
    ISSN: 1432-0428
    Keywords: Diabetes mellitus ; microangiopathy ; peripheral neuropathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twenty diabetic patients with neuropathy underwent clinical and neurophysiological evaluation together with a detailed morphometric assessment of capillary pathology in endoneurial and epineurial microvascular beds of the sural nerve. Morphological data were compared with ten non-diabetic control subjects. There were no significant differences in control subjects between basement membrane area, endothelial cell area, endothelial cell profile number or luminal area of endoneurial when compared with epineurial capillaries. In contrast, when compared with epineurial capillaries, endoneurial capillaries from diabetic patients demonstrated a significant increase in basement membrane (p〈0.001) and endothelial cell (p〈0.001) area and a significant reduction in luminal area (p〈0.001). There was no significant difference in endothelial cell profile number between endoneurial and epineurial capillaries amongst diabetic patients. Previous studies have demonstrated a good correlation between the degree of microangiopathy and measures of neuropathic severity. In the present study increased endoneurial capillary basement membrane area was significantly related to reduced peroneal nerve conduction velocity (p〈0.001), myelinated fibre density (p〈0.001) and elevated vibration (p〈0.05) and thermal (p〈0.001) perception. Increased endothelial cell area and reduced luminal size were related to a reduced peroneal nerve conduction (p〈0.05, p〈0.01, respectively), reduced myelinated fibre density (p〈0.05, p〈0.01) and elevated thermal perception (p〈0.05, p〈0.001). Epineurial capillary basement membrane, endothelial cell and luminal area failed to relate to measures of neuropathic severity. This study has demonstrated more advanced microangiopathy and a more significant relationship to neuropathic severity in endoneurial compared with epineurial capillaries, thus providing further support for the role of microangiopathy in the pathogenesis of human diabetic neuropathy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402283
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of aromatic compounds on hemicellulose-degrading enzymes in Aspergillus japonicus (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 1095-1101 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Aspergillus japonicus was grown in the presence of various aromatic compounds at 0.1 and 1 mg/mL, and extracellular xylanase and arabanase activities were measured. Some of the aromatic compounds tested, especially at the higher concentration, suppressed the appearance of hemicellulase activities, expressed as xylanase or arabanase. Vanillin at 1 mg/mL in the presence of either xylan or araban completely suppressed growth, and guaiacol and p-coumaric acid markedly inhibited the growth of A. japonicus. The effects of the aromatic compounds on the activity of crude enzyme preparations were also ascertained. In vitro arabanase activity was affected more than xylanase activity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260270802
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Heat and microbial treatments for nutritional upgrading of wheat straw (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 381-386 
    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 ligninolytic activities of four cellulolytic organisms were compared using straw. Only Aspergillus japonicus and Polyporous versicolor appreciably degraded lignin with A. japonicus yielding the most protein. In solid culture, most protein was produced by P. versicolor, closely followed by A. japonicus. Pretreatment of the straw by hot water facilitated biodegradation and protein production. The nutritional value of the residual straw was also increased by some fungal cultures. The greatest amount of degradable polysaccharide in the straw was made available by A. japonicus in liquid media and Pleurotus ostreatus in solid media.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260280311
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    Paper (German National Licenses)
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