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SUMMARY: Forty-six strains of Acetobacter , representing twenty species, have been compared on the basis of their respective abilities to proliferate in two defined inorganic media, in which either glucose or ethanol was the sole source of carbon and energy. Twenty-three strains, representing eleven species, grew in either inorganic medium when glucose was present and nine of these strains, representing five species, could grow also in either inorganic medium when ethanol was present. The remaining twenty-three strains, representing eleven species, failed to grow in either medium with either glucose or ethanol. Three organisms grew better with ethanol than with glucose and three were inhibited by ethanol in the presence of glucose.  相似文献   
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About 34% of the strains of Yersinia enterocolitica isolated from raw milk were found to produce lecithinase. A selected strain produced phospholipase C at 22°C and 37°C; production was optimum at 37°C in the stationary phase (14–16 h). A decrease in phospholipase C activity at various storage temperatures (—5°C, 4°C, 37°C) was also observed, although the enzyme was active over a wide range of temperature (5–65°C) and pH (3mD5–7mD5). The phospholipase C was partially purified by ammonium sulphate precipitation and Sephadex column chromatography, and characterized.  相似文献   
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The alga, Draparnaldiopsis indica Bharadwaja has been studiedunder cultural conditions. The young filaments show normal morphology,but as they mature they become multijeriate throughout and formpackets of akinetes. The characteristic differentiation of filamentsinto nodes and internodes is almost completely obliterated withonset of sporulation in culture. The muhiseriate condition inthe genus DraparnaJdiopsis is recorded here for the first time.  相似文献   
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Pot culture studies were conducted using two drought-tolerant and one susceptible cultivar of wheat (Triticum aestivum L.) under three different moisture regimes. Proton spin-lattice relaxation time, T1, leaf water content, LWC, leaf water potential, Ψ, solute potential, Ψs and turgor potential, Ψp were measured from 45 to 75 d after sowing at weekly intervals. The three cultivars did not differ significantly in their values of LWC, leaf water potential, and their components in the stressed and unstressed plants; but they did differ significantly in their T1 values both under stressed and unstressed conditions on all days of measurement, with the drought tolerant cultivars having a higher T1 compared to the susceptible cultivar. This suggests that leaf water T1 is a better parameter for describing plant water status than the traditional water relation indices. The relation between Ψ and T1 was logarithmic, indicating the similarity between T1 and water activity of the cellular water.  相似文献   
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TIWARI  S. C. 《Annals of botany》1983,51(1):17-26
A histochemical investigation on the cell walls of the hypostasein Torenia fournieri Lind. (Scrophulariaceae) revealed thatthey contain large amounts of callose, cellulose and pectins.Except in the middle lamellae, tests failed to show lignin inthe walls. It is surmised that the callose in the hypostasedevelops in order to regulate the flow of metabolites to theembryo sac. Torenia fournieri Lind., hypostase, cell wall, callose  相似文献   
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An investigation of microsporogenesis in Canna L. revealed thatthe tapetum is invasive but non-plasmodial. Tapetal cell protoplastsare released as individuals. In the loculus they are at firstmore or less spherical but can produce amoeboid processes inlate stages of microsporogenesis. They do not fuse with oneanother. Meiosis is normal and cytokinesis is successive. Theimplications of the novel type of tapetum are discussed. canna, Canna, invasive non-syncytial tapetum, tapetum, microsporogenesis  相似文献   
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