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21.
Detection of sugar-binding proteins in membrane-depleted nuclei 总被引:1,自引:0,他引:1
A. P. Seve J. Hubert D. Bouvier M. Bouteille C. Maintier M. Monsigny 《Experimental cell research》1985,157(2):533-538
Nuclear sugar-binding proteins were detected in membrane-depleted nuclei isolated from hamster BHK cells and mouse L 1210 leukemia cells by means of fluorescein-labelled neoglycoproteins. In fluorescence microscopy, the fluorescence was seen throughout the nucleus but was generally brighter over the nucleoli than over the rest of the nucleus. Flow cytofluorometry analysis demonstrated the presence of nuclear sugar-binding proteins for synthetic glycoproteins associated with different sugar residues. Among the nine neoglycoproteins used, four neoglycoproteins (namely alpha-rhamnosylated, alpha-glucosylated, N-acetyl-beta-glucosaminylated and alpha-mannosylated-6P-serum albumin) strongly labelled nuclei. Various controls strongly argue for the specificity of the nuclear labelling. The possibility that some of the sugar-binding proteins might correspond to endogenous nuclear lectins is considered. 相似文献
22.
Structural aspects of intranuclear matrix disintegration upon RNase digestion of HeLa cell nuclei 总被引:1,自引:0,他引:1
The organization of the intranuclear elements observed in histone-depleted (2 M NaCl-extracted) HeLa cell nuclei was investigated by means of electron microscopy and two-dimensional gel electrophoresis. This work was mainly aimed at verifying whether or not an intranuclear skeleton or matrix existed, which could explain the stable attachment of RNA to the residual nuclear structure after high-salt extraction, and its three-dimensional organization. We compared the ultrastructure and the polypeptide composition of RNA-containing and RNA-depleted (RNase-treated) nuclear residues, and we visualized intermediate stages of RNase action on the intranuclear material. We showed that this material was made of two types (fibrillar and granular) of salt-resistant RNP components equally sensitive to RNase when the enzyme was used prior to high-salt extraction. At least in our material and under our experimental conditions, no intranuclear matrix could be distinguished from the residual RNP material. Our results further suggest that formation of such a matrix is a path-dependent phenomenon. 相似文献
23.
Sumanta Basu Rudrapatnam N. Tharanathan Tivadar Kontrohr Hubert Mayer 《FEMS microbiology letters》1985,28(1):7-10
Abstract The chemical structure of the lipid A moiety of the lipopolysaccharide of the type strain of Plesiomonas shigelloides was elucidated. It consists of a β-(1 → 6)-linked glucosamine disaccharide carrying phosphate groups at C-1 of the reducing and at C-4' of the non-reducing glucosamine. It contains a total of 6 residues of fatty acids, 2 amide-linked and 4 ester-linked. The amino groups of the backbone disaccharide are N -acylated by substituted 3-hydroxyacyl residues: at the reducing glucosamine by 3-O-(14:0)14:0; and at the non-reducing glucosamine by 3-O-(12:0)14:0.
Two residues of 3-hydroxytetradecanoic acid are linked to C-3 and C-3' of the glucosamine residues; the hydroxy groups of these ester-linked 3-hydroxytetradecanoic acids are unsubstituted. In free lipid A, the hydroxyl groups at C-4 and C-6' are unsubstituted, indicating that the 2-keto-3-deoxyoctonic acid (KDO) is linked to C-6' of the non-reducing glucosamine, as was shown with enterobacterial lipid A. The taxonomical significance of these structural details is discussed. 相似文献
Two residues of 3-hydroxytetradecanoic acid are linked to C-3 and C-3' of the glucosamine residues; the hydroxy groups of these ester-linked 3-hydroxytetradecanoic acids are unsubstituted. In free lipid A, the hydroxyl groups at C-4 and C-6' are unsubstituted, indicating that the 2-keto-3-deoxyoctonic acid (KDO) is linked to C-6' of the non-reducing glucosamine, as was shown with enterobacterial lipid A. The taxonomical significance of these structural details is discussed. 相似文献
24.
J Bureau J Hubert M Bouteille 《Biology of the cell / under the auspices of the European Cell Biology Organization》1986,56(1):7-16
Co-isolated residual nuclear shells and residual nucleoli from membrane-depleted rat liver nuclei were spread according to Kleinschmidt's method. Comparison of the spread residual structures isolated from nuclear shells and spread pore complex-lamina isolated from nuclear envelopes showed that these residual structures are morphologically identical. Furthermore, our nuclear shell isolation procedure allowed visualization of DNA strands bound to a granular component of the lamina. The fragmentation of nuclear shells allowed us to obtain well-spread nucleolar remnants, in which we observed DNA strands anchored on a residual nucleolar network attached to the lamina. The different molecular features revealed by the spreading of residual nucleolar structures suggest that both non-transcribing nucleolar DNA and active ribosomal genes are linked to the nucleolar network. Although the exact nature of this network remains to be defined, the results of the present study strongly suggest that the DNA molecules of the chromosomes bearing ribosomal genes have many sites of attachment to a non-chromatin nucleolar network which can be referred to as a nucleolar skeletal complex. 相似文献
25.
Annie Conter Dominique Dupouy Christine Delteil Hubert Planel 《Archives of microbiology》1986,144(3):286-290
Previous results from this laboratory have shown that very low chronic doses of gamma radiation can stimulate proliferation of the Cyanobacterium Synechococcus lividus. This modification of cell proliferation occurred during the first doubling. In this paper, we have compared the metabolism of cells cultivated in a normal environment or under chronic irradiation. Incubation of the cells in a new medium induced a high superoxide dismutase (EC 1.15.1.1, SOD) activity at the 18th hour and a degradation of phycocyanin, thus demonstrating that cells were submitted to a photooxidative stress. This increase in superoxide dismutase activity was followed by concomittant peaks of glutathione reductase (EC 1.6.4.2, GR) and glucose-6-phosphate dehydrogenase (EC 1.1.1.49, G6P-DH) at the 24th hour. Irradiated cultures at a dose of 53.5 mGray/year show an earlier and higher peak of SOD, GR, and G6P-DH. In a second stage, cultures showed an earlier onset of photosynthesis under irradiation, as evidenced by an increase in pigment content and an enhancement of glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.13, GAP-DH). These results show that the radiostimulation is related to the activation of enzymes protecting against peroxides that were induced under oxidative circumstances and to the activation of a glucose catabolism via the oxidative pentose phosphate pathway.Abbreviations mGy
milli-Gray
- SOD
superoxide dismutase
- G6P-DH
glucose-6-phosphate dehydrogenase
- GAP-DH
glycer-aldehyde-3-phosphate dehydrogenase
- GSSG
oxidized glutathione 相似文献
26.
Victoria Kolb-Bachofen Jutta Schlepper-Schäfer Hubert Kolb 《Experimental cell research》1983,148(1):173-182
The endocytosis pathways of particles with terminal beta-D-galactosyl groups were studied in isolated rat Kupffer cells by electron microscopy. Colloidal gold particles of sizes 5, 17 and 50 nm were coated with asialofetuin (ASF) and isolated liver macrophages were allowed to bind (at 4 degrees C) or take up (at 37 degrees C) these ligands. Particles of all three sizes were bound via the galactose-particle receptor as shown by carbohydrate inhibition experiments and were ingested effectively. But, whereas ASF-gold particles of sizes 5 and 17 nm are taken up via the coated pit/coated vesicle pathway, the 50 nm particles are not. These enter the cell via non-coated endocytic vacuoles. All three particle sizes are transported to the same lysosomal compartment. These observations demonstrate that at least in macrophages one receptor is capable to mediate endocytosis via two different pathways depending on ligand size and/or valency. 相似文献
27.
At least nine monoclonal antibodies against phytochrome from Pisum sativum L. and 20 against phytochrome from Avena sativa L. have been obtained from mouse hybridomas that were produced by fusion of spleen cells with SP 2/O-Ag14 myeloma cells. Hybridomas were selected and cloned in a single step by plating on a semisolid methylcellulose medium. Eight antibodies to Pisum and one to Avena phytochrome were immunopurified from hybridoma medium or ascitic fluid. When necessary, secreted antibodies were verified to be against phytochrome by demonstrating to be against phytochrome by demonstrating immunoadsorption of phytochrome, detected as loss of photoactivity and-or by appearance of the approx. 120,000-dalton phytochrome band upon sodium dodecyl sulfate polyacrylamide gel electrophoresis. 相似文献
28.
J C Hubert A Guyonvarch B Kammerer F Exinger P Liljelund F Lacroute 《The EMBO journal》1983,2(11):2071-2073
29.
30.
Jean Hubert 《Cell and tissue research》1970,107(2):265-283
Résumé Les gonocytes primaires sont relativement pauvres en polysomes et l'ergastoplasme granulaire est très réduit. Le reticulum endoplasmique de type lisse se développe au cours du développement embryonnaire. L'appareil de Golgi est bien représenté et localisé au niveau de la calotte juxtanucléaire mitochondriale. Les liposomes cytoplasmiques sont très nombreux.Cette étude précise la structure du nucléole «annulaire» et de la «masse paranucléolaire» observés en microscopic photonique. Des modifications nucléolaires sont constatées au cours du développement embryonnaire. Certains aspects ultrastructuraux sont vraisemblablement en rapport avec le déplacement autonome des gonocytes. La signification physiologique du nucléole «annulaire» et de la «masse paranucléolaire» est envisagée.
Ultrastructural study on the primordial germ cells during embryonic development of Lacerta vivipara Jacquin
Summary The primordial germ cells of Lacerta vivipara have relatively few free polysomes and little ergastoplasm. Smooth endoplasmic reticulum increases during embryonic development. The Golgi apparatus is well developed and lies close to the mitochondrial juxtanuclear cap. This study shows the ultrastructure of the ring-shaped nucleoli and the masse paranucléolaire. Modifications in nucleolar structure are observed during embryonic development. Some ultrastructural features are probably related to the ameboid movement of the primordial germ cells. The physiological meaning of the ring-shaped nucleoli and the masse paranucléolaire is considered.
Avec la collaboration technique de Mme. M. Hubert. 相似文献