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1996 (1)
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1Author    Fritz Seel, Willi Schaum, Georg SimonRequires cookie*
 Title    Über die Entstehung von Zuckern und zuckerähnlichen Substanzen aus in Zeolithen absorbiertem Formaldehyd durch UV-Bestrahlung Synthesis of Sugars and Sugar-Like Products by UV Irradiation of Formaldehyde Absorbed on Zeolites  
 Abstract    The formation of sugars and sugar-like substances by UV irradiation of formaldehyde adsorbed on zeolites of type A and X has been demonstrated. The conversion inside or outside the matrix and product distribution depend on the type of zeolite. 
  Reference    Z. Naturforsch. 36b, 1451—1456 (1981); eingegangen am 7. Mai 1981 
  Published    1981 
  Keywords    Formaldehyde, Sugars, Zeolites 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1451.pdf 
 Identifier    ZNB-1981-36b-1451 
 Volume    36 
2Author    J.F T Spencer, D. M. Spencer, R. M. IllerRequires cookie*
 Title    Inability of Petite M utants of Industrial Yeasts to Utilize Various Sugars, and a Comparison with the Ability of the Parent Strains to Ferment the Same Sugars Microaerophilically  
 Abstract    A number of industrial strains of Saccharom yces cerevisiae were converted to the petite form and tested for the ability to utilize galactose, maltose, sucrose, a-methyl glucoside and raffinose. The parent strains all metabolized these sugars aerobically. Twelve of the petite forms did not utilize galactose, six failed to utilize maltose, 17 did not utilize a-methyl glucoside, and 18 did not utilize raffinose. The petites of two distiller's yeast strains did not utilize sucrose. The respiratory-competent parent strains nearly all fermented galactose, maltose, sucrose and raffinose, though 19 strains did not ferment a-methyl glucoside microaerophilically. Three strains did not ferment galactose, two fermented it only after several days adaptation, one did not ferment raffinose, and two did not ferment sucrose under microaerophilic conditions. Six respiratory-competent strains which did not utilize galactose when in the petite form fermented higher (10%) concentrations of glucose and maltose under microaerophilic conditions, but only three of these fermented galactose. The implications o f these findings for the use of such strains in industry are discussed briefly. 
  Reference    Z. Naturforsch. 38c, 405—407 (1983); received January 25 1983 
  Published    1983 
  Keywords    Petite Mutants, Sugars, Industrial Yeasts, Saccharom yces sp 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0405.pdf 
 Identifier    ZNC-1983-38c-0405 
 Volume    38 
3Author    M. Einrad Boll3, LutzW D W Eberb, Andreas StampflbRequires cookie*
 Title    Nutritional Regulation of the Activities of Lipogenic Enzymes of Rat Liver and Brown Adipose Tissue  
 Abstract    Nutrition-induced effects on the activity of enzymes of lipogenesis, fatty acid synthase (FAS; EC 2.3.1.85). ATP citrate lyase (ACL; EC 4.1.3.8), malic enzyme (ME; EC 1.1.1.40), glucose-6-phosphate dehydrogenase (G6PDH; EC 1.1.1.49) and 6-phosphogluconate dehy­ drogenase (PGDH; EC 1.1.1.44) were investigated in liver and interscapular brown adipose tissue (BAT) of rats. The lipogenic enzymes could be grouped into two categories according to their response to dietary manipulations; FAS and ACL. both key enzymes of lipogenesis, responded fast and strongly to dietary manipulations. ME, G6PD H and PG D H , enzymes which also contribute to metabolic pathways other than lipogenesis, responded in a more sustained and less pronounced fashion. Feed deprivation caused the specific activities of lipogenic enzymes to decline several-fold. R efeeding of previously fasted (up to 3 days) animals increased the activities dramatically (10-to 25-fold) to far above pre-fasting levels ("overshoot"). Repetition of the fasting/refeed­ ing regimen increasingly impaired the ability of both tissues to synthesize overshooting en­ zyme activities in the subsequent refeeding period. The fasting-induced decline of the activi­ ties was prevented when sugars were provided to the animals via drinking water. The sugars displayed different effectivities; sucrose= glucose> fructose> m a lto s e » lactose. Sugars as the sole nutrient after fasting were also able to induce overshooting enzyme activities. Again, activities of FAS and ACL responded in a more pronounced fashion than the other three enzymes. Transition from feeding one diet to feeding a new diet of different composition led to adapta­ tion of the lipogenic enzym e activities to levels characteristic for the new diet. Replacing a low-carbohydrate with a high-carbohydrate diet proceeded with major alterations o f enzyme activities. TTiis process of attaining a new level took up to 20 days and involved pronounced oscillations of the specific activities. In contrast, when a high-carbohydrate diet was replaced with another diet, particular one high in fat, transition to new enzyme activities was com ­ pleted within 2 -3 days and proceeded without oscillations. All dietary manipulations caused more pronounced responses in young (35d-old) than in adult (180d-old) animals. 
  Reference    Z. Naturforsch. 51c, 859 (1996); Received August 8 1996 
  Published    1996 
  Keywords    Lipogenic Enzymes, D iet Composition, Starvation/Refeeding, Sugars, Enzyme Regulation Oscillation 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0859.pdf 
 Identifier    ZNC-1996-51c-0859 
 Volume    51