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1.
The Escherichia coli dnaW mutation is an allele of the adk gene   总被引:3,自引:0,他引:3  
Summary A dnaW mutant, isolated on the basis of inability to effect conjugal DNA transfer at high temperature, has been shown by complementation and enzyme assay to be defective in the adk (adenylate kinase; EC 2.7.4.3) locus. The adk mutant, known to have reduced ATP concentration at the nonpermissive temperature (Cousin and Belaich 1966), was used to demonstrate a donor energy requirement for stable aggregate formation and for chromosome transfer in conjugation.  相似文献   
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Summary Chromosomes from 19 unrelated Southern Yugoslav families in which cystic fibrosis (CF) occurs were analysed for the presence of the ΔF508 mutation, using polymerase chain reaction amplification followed by dot blot and polyacrylamide gel analysis. Of the 38 CF chromosomes, 15 (39.5%) carry the ΔF508 deletion. Restriction fragment length polymorphism haplotypes for KM19/PstI, XV2c/TaqI and J3.11/PstI marker loci were determined and are compared for a total of 34 N and 37 CF chromosomes.  相似文献   
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Abstract The randomized clinical trial with interferon-α (IFN) or thymic hormones versus conventional therapy was conducted in patients with myocarditis and idiopathic dilated cardiomyopathy (IDC). We enrolled 180 patients to receive IFN (3–5 million units per day) for 3 months, thymomodulin (10 mg three times per week) for 2 months, or conventional therapy alone. Patients were followed-up for 7 years after the end of treatment. Left ventricular function, exercise tolerance and survival rate were significantly better at long-term follow-up in patients treated with IFN or thymomodulin, than in conventionally treated patients. These results implicate that immune modulating therapy might represent important contribution in the treatment of myocarditis and IDC.  相似文献   
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The cichlid fishes comprise the largest extant vertebrate family and are the quintessential example of rapid “explosive” adaptive radiations and phenotypic diversification. Despite low genetic divergence, East African cichlids harbor a spectacular intra- and interspecific morphological diversity, including the hyper-variable, neural crest (NC)-derived traits such as coloration and craniofacial skeleton. Although the genetic and developmental basis of these phenotypes has been investigated, understanding of when, and specifically how early, in ontogeny species-specific differences emerge, remains limited. Since adult traits often originate during embryonic development, the processes of embryogenesis could serve as a potential source of species-specific variation. Consequently, we designed a staging system by which we compare the features of embryogenesis between three Malawi cichlid species—Astatotilapia calliptera, Tropheops sp. ‘mauve’ and Rhamphochromis sp. “chilingali”—representing a wide spectrum of variation in pigmentation and craniofacial morphologies. Our results showed fundamental differences in multiple aspects of embryogenesis that could underlie interspecific divergence in adult adaptive traits. First, we identified variation in the somite number and signatures of temporal variation, or heterochrony, in the rates of somite formation. The heterochrony was also evident within and between species throughout ontogeny, up to the juvenile stages. Finally, the identified interspecific differences in the development of pigmentation and craniofacial cartilages, present at the earliest stages of their overt formation, provide compelling evidence that the species-specific trajectories begin divergence during early embryogenesis, potentially during somitogenesis and NC development. Altogether, our results expand our understanding of fundamental cichlid biology and provide new insights into the developmental origins of vertebrate morphological diversity.  相似文献   
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Summary A new cis-peptide bond mimetic, -benzyl-o-aminomethylphenylacetic acid, was synthesized and incorporated in a homodetic somatostatin analogue. Biological binding tests and 2D NMR conformational analysis indicate that the configuration of the bridge-unit asymmetric center and the orientation of the benzyl side chain play a key role in the biological activity of this type of somatostatin analogues.  相似文献   
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Summary Administration of a low dose of l-PAM (0.75 mg/kg) to mice bearing a large SC MOPC-315 tumor and extensive metastases led to the development of augmented antitumor immune potential in their hitherto immunosuppressed spleen cells. Such drug-induced potentiation of antitumor immune responsiveness appeared by day 2 after chemotherapy, and it could not be further enhanced but was actually reduced by depletion of glass-adherent cells, a procedure which is effective in depleting the cells known to have inhibitory activity (i.e., macrophages and metastatic tumor cells). To establish that l-PAM can lead to selective in situ abrogation of the inhibitory effectiveness of the splenic macrophages and metastatic tumor cells, we demonstrated that incubation of immunosuppressed tumor-bearer spleen cells with a low concentration of l-PAM in vitro also resulted in augmented antitumor immune potential that could not be further augmented by depletion of glass-adherent cells. l-PAM-mediated enhancement of the antitumor immune potential of immunosuppressed tumor bearer spleen cells was due at least in part to the effects of the drug on the splenic metastatic tumor cells. Isolated tumor cells treated with a low concentration of l-PAM were not only devoid of inhibitory activity for the primary in vitro antitumor immune response by normal spleen cells, but actually manifested a strong immunostimulatory capacity. Thus, l-PAM given at a low dose enhances the development of potent antitumor immunity which brings about the eradication of a large tumorigenic load that remains after the drug has been cleared from the circulation.Presented in part at the 67th annual meeting of the Federation of American Societies for Experimental Biology in Chicago, April 10–15, 1983 Abbreviations used: L-PAM, l-phenylalanine mustard (Melphalan); CY, cyclophosphamide  相似文献   
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