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101.
After a 2 h exposure of intact soybean nodules to high concentrations of NaCl (100mol m?3) or oxygen (8OkPa O2), morphometric computations carried out using an image analysis technique on semi-thin sections showed that both treatments induced a decrease in the area of the inner-cortex cells, which were then characterized by a tangential elongation. In contrast, no significant change in area occurred in the middle-cortex cells although their elongation decreased. Electron microscopic observations showed that in the inner-cortex cells changes included the presence of wall infoldings, an enlarged periplasmic space and a lobate nucleus whose chromatin distribution differed from that of the control. Structural changes also occurred in the endoplasmic reticulum, microbodies, mitochondria and plastids. From several of these changes, which are similar to those noted in osmocontractil cells in response to external stimuli, it can be hypothesized that the inner cortex may provide a potential mechanism for the control of oxygen diffusion through the nodules. 相似文献
102.
A Gram-positive Rhodococcus erythropolis strain S1 was shown to assimilate aromatic amino acids such as L-phenylalanine, L-tyrosine, L-tryptophan, D-phenylalanine, D-tyrosine and D-tryptophan, which were utilized not only as the sole carbon source but also as a suitable nitrogen source. The highest growth on these aromatic amino acids occurred at a temperature of 30°C. L-Phenylalanine, L-tyrosine and L-tryptophan degradative pathways would appear to be independent, and to be induced alternatively. The strain S1 also showed the ability to assimilate peptides which consisted of only L-phenylalanine and L-tyrosine. 相似文献
103.
When spores of the fern,Pteris multifida, were aseptically cultured in the dark, sporophytic plants were apogamously induced. The plants have been subsequently grown
in pots until the development of leaves with many sporangia for observations of meiotic characteristics in their sporocytes.
The sporophytic plants originated from spores were estimated to be haploid, and the estimation was supported by abnormal meiosis
in sporocytes and the absence of mature spores, but some chromosomes (n=58) formed bivalents in the meiotic process. 相似文献
104.
105.
The possible effects of a selected locus on a closely linked microsatellite
locus are discussed and analyzed in terms of coalescent theory and models
of the mutation process. Background selection caused by recurrent
deleterious mutations will reduce the variance of allele size at a
microsatellite locus. The occasional substitution of advantageous alleles
(genetic hitchhiking) will also reduce the variance, but a high mutation
rate at a microsatellite locus can restore the variance relatively rapidly.
Overdominance at the selected locus will increase the variance at the
microsatellite locus and create partitioning of the variation in allele
size among gametes carrying one or the other of the overdominant alleles.
These results suggest that neutral microsatellite loci can provide
indicators of selective processes at closely linked loci.
相似文献
106.
107.
108.
F Velge-Roussel C Verwaerde J M Grzych A Auriault A Capron 《Journal of immunology (Baltimore, Md. : 1950)》1989,142(7):2527-2532
A rat IgE mAb specific for larval Ag (26 kDa, 56 kDa) has been shown to protect rats against Schistosoma mansoni infection. Immunizations of Lou/M rats performed with this IgE (Ab1) induced the production of antiidiotypic antibodies (Ab2). Moreover, after this Ab2 production, anti-antiidiotypic antibodies (Ab3) were revealed. The screening of Ab3 isotypes showed the presence of IgG Ab3 and more interestingly of IgE Ab3, i.e., the same isotype as Ab1. These IgE and IgG antibodies recognized predominantly the 26-kDa Ag and were cytotoxic for schistosomula in the presence of platelets for IgE Ab3 and eosinophils for IgG Ab3. Both IgE and IgG Ab3 conferred by passive transfer protective immunity to infected rats (up to 50%). Thus the immunization with an IgE mAb led in part to the production of Ab3 of the same isotype as Ab1. In conclusion, these results suggest that the isotype selection of the antibodies of the third generation (Ab3) might be influenced by the Ab1. The respective role of the idiotope and isotype of Ab1 in isotype regulation is discussed. 相似文献
109.
The antimicrobial activity of cryptolepine is influenced by the type of medium employed, agitation and the presence of non-inhibitory concentrations of EDTA. The use of Mueller–Hinton broth (MHB), iso-sensitest broth and tryptone soya broth (TSB) produced lower minimum inhibitory concentrations (MICs) for some of the test organisms compared with nutrient broth or yeast dextrose broth (YDB). For example, a fourfold drop in MIC was recorded for Saccharomyces cerevisiae in MHB compared with the same organism tested in YDB. Agitation of the broths during incubation nearly always produced lower MICs for the bacteria, an eightfold decrease in MIC being recorded for Escherichia coli cultured in nutrient broth with agitation compared with a statically maintained culture. A non-inhibitory concentration (10−3 mol l−1 ) of disodium EDTA enhanced the antimicrobial activity of cryptolepine. Against E. coli NCTC 11560, an eightfold decrease in MIC and minimum bactericidal concentration (MBC) was recorded when tested in the presence of EDTA. 相似文献
110.