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101.
102.
Summary Four out of thirty-one algae strains belonging to the order Chlorococcales exhibited good growth on solid media containing n-alkanes. Chlorella vulgaris (397) was able to degrade n-tridecane in cooxidation. The corresponding secondary alcohols and ketones in C2-to C7-position could be identified in the culture broth. The same oxidation products could be found in the media of cultures grown in darkness with the addition of glucose. This demonstrates a subterminal degradation pathway of C. vulgaris.There was no indication for a mono-or diterminal oxidation of alkanes by algae.The fatty acid pattern of lipids exhibited an incease in long chain acids and a decrease in shorter chain acids. The growth rate of cells grown on alkanes increased after 72 h, but the release of autospores was retarded. 相似文献
103.
Summary In submerged culture there was negligible growth of Fusarium moniliforme with either n-tetradecane or gasoil (C13–C19) as the only carbon and energy source. In surface culture the cell yield was about 0.25 g dm–3 dry weight after four weeks incubation. Some oxidation products, mainly isomeric tetradecanones (4-one, 5-one, 6-one and 7-one), could be identified. However the cell yield in a trickle-flow column was about 3 g dm–3 dry weight after 7 days. Only traces of oxidation products could be detected. In a fixed-bed reactor, filled with glass rings, cell yields were similar to those in the trickle-flow column and depended on the medium flow rate.After termination of growth in the fixed-bed reactor, similar amounts of gibberellic acid were produced in a nitrogen-free medium with either gasoil or glucose. 相似文献
104.
105.
Variations in aspartasic activity in various media are due to aspartate-ammonium lyase induction and to regulation of the biosynthesis of this enzyme. Evidence for neosynthesis of the enzyme is provided by labelling and separation of the protein. The inducer appears to be aspartic acid. The biosynthesis is subject to pronounced catabolic repression. The physiological function of aspartate-ammonium lyase is discussed. 相似文献
106.
Dr. Jack E. Brinn Hubert W. Burden Michael R. Schweisthal 《Cell and tissue research》1977,182(1):133-138
Summary The fetal rat pancreas, explanted at 18 days of gestation and cultured up to ten days, contains numerous acetylcholinesterase-positive neurons. These nerves usually appear in small ganglia although single nerve cells are encountered. The axons of these intrapancreatic nerves appear to terminate only in the islet tissue and not on any exocrine components of the expiant. It is concluded that the fetal rat pancreas contains an islet-specific group of cholinergic neurons.We gratefully acknowledge the skilled technical assistance of Dan Whitehead and the secretarial assistance of Mary Pat Brady 相似文献
107.
108.
Hubert G. Theuns Jan E.G. van Dam Jan M. Luteijn Cornelis A. Salemink 《Phytochemistry》1977,16(6):753-755
Three new alkaloids have been identified from Papaver bracteatum, 14-β-hydroxycodeinone, 14-β-hydroxycodeine and N-methylcorydaldine. The presence of alpinigenine was also confirmed. 相似文献
109.
Gordon M. Schoepfle Warren S. Rehm John H. Young 《Bulletin of mathematical biology》1978,40(3):411-424
Solutions of the Poisson-Boltzmann equation yield potential profiles and equilibrium distributions of ions on either side
of a spherical shell membrane across which there exists a separation of ionic charges. For the special case in which the membrane
is permeable to only one ion the total charge separation is analyzed in terms of the potential difference given by the Nernst
equation. Potential profiles and ionic charge distributions are also given for situations involving a uniform distribution
of fixed charges within the membrane. 相似文献
110.
Juan C. Slebe Roman Herrera Elizabeth Hubert Alicia Ojeda Ricardo B. Maccioni 《The protein journal》1983,2(6):437-443
Selective treatment of pig kidney fructose 1,6-bisphosphatase with potassium cyanate leads to the formation of an active carbamylated enzyme that has lost the cooperative interactions among AMP sites, but retains sensitivity to inhibition of catalytic activity by the regulator AMP. Incorporation data on [14C]KNCO indicate that the loss of enzyme cooperativity at the AMP sites is related to selective carbamylation of four lysine residues per mole of tetrameric enzyme. Exhaustive carbamylation suggests that a second lysine residue per subunit is essential for AMP inhibition. 相似文献