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41.
The structural organization of Tetrahymena pyriformis is such that its cilia are remote from the main centers of lipid metabolism. As a result, the ciliary membrane lipid composition of cells exposed to low-temperature stress is initially unaffected by the significant metabolic changes induced in microsomal membranes. Nevertheless, changes in the ciliary membrane lipid composition can be detected during the first 4 h of cold exposure. A combination of in vivo and in vitro experiments has provided strong evidence for a substantial retailoring of ciliary phospholipid molecular species in situ in the absence of any importation of lipids from the cell interior or change in overall ciliary fatty acid composition. The mechanism responsible for the ciliary lipid changes is independent of the one(s) triggering internal acclimation responses. Our observations establish for the first time that chilling stress can simultaneously induce separate and distinctive lipid modification responses in different parts of a cell. This finding could be important in identifying the molecular ‘sensor’ capable of actuating stress-induced lipid changes. 相似文献
42.
Paola Cescutti Neil Ravenscroft Stephen Ng Zamas Lam Guy G.S. Dutton 《Carbohydrate research》1983,244(2):325-340
The capsular polysaccharide of Klebsiella SK1 was investigated by methylation analysis, Smith degradation, and 1H NMR spectroscopy. The oligosaccharides (P1 and P2) obtained by bacteriophage ΦSK1 degradation of the polymer were studied by methylation analysis, and 1D- and 2D-NMR spectroscopy. The resulting data showed that the patent repeating unit is a branched pentasaccharide having a structure identical to the revised structure recently proposed for Klebsiella serotype K8 capsular polysaccharide. The 2D-NMR data showed that one third of the glucuronic acid residues in the SK1 polymer are acetylated at O-2, O-3, or O-4. FABMS studies confirmed the presence of monoacetylated glucuronic acid residues. Thus, the relationship between the Klebsiella K8 and SK1 polymers is akin to that found for Klebsiella polysaccharides K30 and K33, which have been typed as serologically distinct yet their structures differ only in the degree of acetylation. 相似文献
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The fluorescence intensity of diphenylhexatriene (DPH) and of trimethylammonium-diphenylhexatriene (TMA-DPH) is measured when these probes are embedded in vesicles of dipalmitoyl- and dioleoylphosphatidylcholine (DPPC and DOPC), in mixtures of these vesicles as well as in vesicles of the mixed phospholipids, in trout intestinal brush border membranes and in mitoplasts of rat liver cells. The intensity in DOPC vesicles is found to be significantly higher than in DPPC vesicles. When these systems are irradiated with strong ultraviolet light radiation, a decrease in the fluorescence intensity is observed; this effect is much stronger in DOPC than in DPPC vesicles. The fluorescence anisotropy values in the mixture of vesicles as well as in the membranes show an initial increase with irradiation which is followed by a significant decrease. A transfer of DPH molecules between DPPC and DOPC vesicles is observed. For TMA-DPH this transfer takes place only from DPPC to DOPC vesicles, but not vice-versa. These results are related to intensity and anisotropy measurements of these probes in cell cultures. 相似文献
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Allergenicity of Mycobacterial Ribosomal and Ribonucleic Acid Preparations in Mice and Guinea Pigs 总被引:18,自引:3,他引:15 下载免费PDF全文
Guinea pigs were injected subcutaneously with mycobacterial ribosomal fraction incorporated in Freund's incomplete adjuvant and tested 6 and 12 weeks later by the intradermal injection of 0.5 μg (25 TU) of Purified Protein Derivative. No evidence of delayed-type hypersensitivity could be detected in these animals, although large necrotic reactions were obtained in guinea pigs sensitized with living, attenuated mycobacterial cells. Mice also were vaccinated by the intraperitoneal injection of mycobacterial ribosomal fraction or ribonucleic acid (RNA) and tested for sensitivity to tuberculin at various subsequent times. No evidence of true tuberculin hypersensitivity could be detected at any time, although what appeared to be small Arthus type reactions were seen in mice given the largest vaccinating doses. Attempts to recall tuberculin sensitivity in vaccinated mice by the intravenous injection, 4 weeks after vaccination of living cells, of either the virulent or attenuated mycobacterial strains were unsuccessful. Instead, when the virulent cells were injected, a suppression of footpad reactivity was noted in animals made sensitive to tuberculin by the previous intraperitoneal injection of viable attenuated mycobacterial cells. Both guinea pigs and mice, vaccinated as described above, were also skin tested or footpad tested, respectively, with 2 μg of the ribosomal fraction or RNA used for vaccination. No evidence of true tuberculin hypersensitivity could be obtained; instead, in guinea pig skin very small dermonecrotic areas were noted, and in mice swelling and redness of the footpad occurred to an equal extent in both vaccinated and nonvaccinated mice. The possible role of tuberculin hypersensitivity in acquired immunity to tuberculosis is discussed, and the conclusion is reached that its part, if any, is minor. 相似文献
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Factors Affecting Immunogenic Activity of Mycobacterial Ribosomal and Ribonucleic Acid Preparations 总被引:28,自引:0,他引:28 下载免费PDF全文
By following careful procedures, mycobacterial ribosomal fractions and ribonucleic acid (RNA) prepared by ethyl alcohol precipitation were obtained which have immunogenic activities similar to the viable attenuated H37Ra cells of Mycobacterium tuberculosis from which they were obtained. This comparison was based on the amount of ribonucleic acid (RNA) present. These preparations consisted of approximately 63% RNA and 37% protein; no deoxyribonucleic acid or polysaccharide was detected by chemical tests. A high correlation was found between the immunogenic activity of a preparation and the per cent increase in hyperchromicity at 260 nm of a ribonuclease-hydrolyzed portion. Final concentrations of sodium dodecyl sulfate higher than 0.25% when used for the preparation of the ribosomal fractions and RNA resulted in significantly lower immune responses and greater variation between experiments. This was not related to the amount of protein present. The stability of the ribosomal and RNA preparations was tested under a variety of conditions. The need for a good protective adjuvant again was shown since mouse serum readily hydrolyzed the RNA. Equal immunity was obtained after immunization by the intraperitoneal and subcutaneous routes; however, no immune response was obtained when the intravenous route was used. Preliminary results with RNA prepared with phenol showed that it was more easily degraded during preparation. This resulted in a lower immune response than was obtained with the RNA prepared with ethyl alcohol. 相似文献
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From a survey of the literature on follicular lymphoma it appears that the lesion of Brill-Symmers disease may be considered to be a form of neoplasm. The authors have reviewed a series of 18 cases seen at the Hôtel-Dieu of Québec between 1950 and 1960 and have adopted Rappaport''s classification published in 1956, but leaving out the “Hodgkin” Type 5 which they propose to examine more fully in another paper.There appears to be a degree of positive correlation between the histologic type and the course of the disease, the well differentiated cell Type 1 being associated with a protracted course. This neoplasm should not be mistaken for benign follicular hyperplasia. 相似文献
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Twenty-seven adults with acute poststreptococcal glomerulonephritis were divided into two groups according to the severity of reduction in renal function: (1) 14 patients with mild depression of renal function, and (2) 13 patients with more severe renal insufficiency. In the first group the outcome was favourable, with complete clinical recovery in 11 patients. Only two patients in the second group have recovered. Five have died of renal failure and in six the chronic stage has developed. The most notable histopathological lesion observed in this group of patients was severe proliferative glomerulonephritis with a large number of epithelial crescents. According to the mode of development and time of onset of renal failure, these 13 patients could be divided into three sub-groups: (1) early renal failure without oliguria (three patients), (2) early renal failure with severe oliguria or anuria (three patients) and (3) delayed renal failure (seven patients).Although there are exceptions, the development of renal insufficiency in an adult patient suffering from acute glomerulonephritis is usually associated with a guarded prognosis. 相似文献