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51.
A protein binds the selenocysteine insertion element in the 3'-UTR of mammalian selenoprotein mRNAs. 总被引:6,自引:0,他引:6 下载免费PDF全文
Several gene products are involved in co-translational insertion of selenocysteine by the tRNA(Sec). In addition, a stem-loop structure in the mRNAs coding for selenoproteins is essential to mediate the selection of the proper selenocysteine UGA codon. Interestingly, in eukaryotic selenoprotein mRNAs, this stem-loop structure, the selenocysteine insertion sequence (SECIS) element, resides in the 3'-untranslated region, far downstream of the UGA codon. In view of unravelling the underlying complex mechanism, we have attempted to detect RNA-binding proteins with specificity for the SECIS element. Using mobility shift assays, we could show that a protein, present in different types of mammalian cell extracts, possesses the capacity of binding the SECIS element of the selenoprotein glutathione peroxidase (GPx) mRNA. We have termed this protein SBP, for Secis Binding Protein. Competition experiments attested that the binding is highly specific and UV cross-linking indicated that the protein has an apparent molecular weight in the range of 60-65 kDa. Finally, some data suggest that the SECIS elements in the mRNAs of GPx and another selenoprotein, type I iodothyronine 5' deiodinase, recognize the same SBP protein. This constitutes the first report of the existence of a 3' UTR binding protein possibly involved in the eukaryotic selenocysteine insertion mechanism. 相似文献
52.
Bienvenu Thierry Hubert Dominique Fonknechten Nuria Dusser Daniel Kaplan Jean Claude Beldjord Cherif 《Human genetics》1994,94(1):65-68
Human Genetics - Cystic fibrosis is caused by mutations in the cystic fibrosis transmembrane conductance regulator gene (CFTR). Analysis of DNA from a pancreatic sufficient patient by means of... 相似文献
53.
Rinkel Monique Hubert Jean-Claude Roux Brigitte Lett Marie-Claire 《Current microbiology》1994,29(5):249-254
AKlebsiella pneumoniae strain having mobilization helper potential has been isolated from the river Rhine. Analysis of the transconjugants resulting from the mobilization of nonconjugative pBR-type plasmids and RSF1010 derivatives showed that the transfer-helper capacity of theK. pneumoniae strain is related to the presence of a Tn3-like transposable element, Tn5403. This element has been identified and localized in a plasmid. 相似文献
54.
Fourier transform infrared (FTIR) spectroscopy for identifying Lactobacillus species 总被引:3,自引:0,他引:3
Abstract Fourier Transform infrared (FTIR) spectroscopy can be used to identify microorganisms. This study describes the influence of culture conditions on FTIR spectra and the discrimination of Lactobacillus species found in breweries. Fifty three Lactobacillus strains were analysed by FTIR spectroscopy and identification at the species level was correct for 94% of the strains, and at the strain level for 91% of the strains. 相似文献
55.
Bert Weckhuysen Luc Vriens Hubert Verachtert 《Applied microbiology and biotechnology》1993,39(3):395-399
Butanal is one of the odorous compounds produced in the animal-rendering and food-processing industries and also in sewage-treatment plants. It shows the necessity for complementing such plants with systems for off-gas treatment. Biofiltration using simple packing material was tested for the removal of butanal. Excellent results were obtained when the filters operated at optimal humidity and were supplemented with inorganic nutrients. Without nutrients, butyric acid was detected in the effluent gas, which may explain the lower efficiency of filters without nutrients. Under optimal conditions an elimination of around 90 g·m–3·h–1 was reached. 相似文献
56.
Mutagenesis and mutant enrichment in Lactobacillus plantarum, a lactic acid bacterium used in silage, sauerkraut and sausage fabrication, were studied. In optimal conditions, auxotrophic mutants were obtained that permitted investigation of the de novo pyrimidine biosynthesis. Uracil-requiring mutants were characterized for their enzymatic defect, in aspartate transcarbamylase (ATCase), dihydro-orotase (DHOase), dihydro-orotate dehydrogenase (DHOdehase), orotidine monophosphate pyrophosphorylase (OMPppase) or in orotidine monophosphate decarboxylase (OMPdecase). The five enzymatic activities are totally repressed by uracil in the growth medium. 相似文献
57.
L. Pradier E. Heuillet J. P. Hubert M. Laville S. Le Guern A. Doble 《Journal of neurochemistry》1993,61(5):1850-1858
Abstract— In the human astrocytoma cell line U 373 MG, application of substance P (SP) leads to a transient increase in cytosolic calcium concentration and to a biphasic current response in voltage-clamped cells. Using these two functional assays we have characterized pharmacologically the SP response in U 373 MG cells. SP and [l -Pro9]SP displayed high potencies in both assays with EC50values of 2.5 ± 10?9M and 1 ± 10?9M on calcium responses and 110?9M and 510?9M on ion current responses, respectively. The high potency of SP and [l -Pro9]SP as well as the low potency of [Lys5,MeLeu9,N-Leu10]neurokinin A(4-10) and the inactivity of senktide demonstrate the NK1-type pharmacology of these responses. Furthermore, the NK1 antagonists (±)-CP 96,345, its chloro analogue, (±)-cis-3-(2-chlorobenzylamino)-2-benz-hydrylquinuclidine, and RP 67580 were potent antagonists of both SP responses. For the calcium mobilization induced by SP (1 (10?7M), the IC50 values for the three antagonists were 4 ± 10?10M, 4 ± 10?9M, and 9 ± 10?9M, respectively, whereas on the current response evoked by SP 10?8M), the IC50 values were 8 ± 10?9M, 2.4 ± 10?8M, and 1.2 10?7M, respectively. Despite differences in the absolute IC50 values obtained with both techniques, the relative potencies of the three antagonists correlate fairly well. The U 373 MG cell line provides a useful model system for studies of the pharmacology of the human NK1receptor and its transduction mechanisms at the level of second messengers and modulation of ion currents. 相似文献
58.
The 23-kilodalton E1 phosphoprotein of bovine papillomavirus type 1 is nonessential for stable plasmid replication in murine C127 cells. 总被引:4,自引:2,他引:2 下载免费PDF全文
The 23-kDa protein encoded by the 5' segment of the E1 open reading frame of bovine papillomavirus type 1 (BPV1) was previously ascribed a negative regulatory function for the replication of viral plasmid DNA. However, results from recent functional and biochemical studies do not readily support this genetic assignment. Therefore, we have reassessed the role of this protein in papillomavirus DNA replication by using a mutant of BPV1 which is unable to express this E1 protein. This mutant viral DNA was found to replicate extrachromosomally with stability and copy number per cell similar to those of wild-type plasmid DNA. Thus, the absence of expression of the 23-kDa E1 protein did not lead to deregulated viral plasmid replication. We conclude that the 23-kDa E1 protein is nonessential for stable plasmid replication. 相似文献
59.
Thorsten Wöhl Hannelore Klier Hubert Ammer Friedrich Lottspeich Viktor Magdolen 《Molecular & general genetics : MGG》1993,241(3-4):305-311
In Saccharomyces cerevisiae, hypusine-containing proteins are encoded by two closely related genes, HYP1 and HYP2, which are regulated reciprocally by oxygen and heme. We have purified the aerobically expressed hypusine-containing proteins from yeast. The three proteins detected (two isoforms, which differ in their pI values, and a degradation product thereof, lacking the N-terminal 10 amino acid residues) are all encoded by HYP2. The N-terminus of both isoforms is formed by acetylation of a serine residue after cleavage of the first methionine. Cells mutant for hyp2 are unable to grow aerobically. However, under anaerobic conditions these mutants display no obvious phenotype, presumably because the strictly anaerobically expressed HYPI gene product (Hyp1p) is present. This implies that Hyp1p and Hyp2p fulfill very similar functions. In fact, Hyp1p can substitute for Hyp2p under aerobic conditions, when expressed under the control of the GAL1 promoter in hyp2 mutant cells.Abbreviations
HYP1 and HYP2
S. cerevisiae genes encoding hypusine-containing protein Hyplp and Hyp2p, respectively 相似文献
60.
Rudrapatnam N. Tharanathan Akira Yokota Heike Rau Hubert Mayer 《Archives of microbiology》1993,159(5):445-452
Lipopolysaccharides (LPS), isolated from four Mycoplana species, i.e. the type strains of M. bullata, M. segnis, M. ramosa and M. dimorpha, were characterized onto their chemical composition and their respective lipid A-types. Those of M. bullata and M. segnis showed on DOC-PAGE an R-type character and had lipid A's of the Lipid ADAG-type which exclusively contained 2,3-diamino-2,3-dideoxy-d-glucose as lipid A sugar. LPS's of M. ramosa and M. dimorpha showed, although only weakly expressed, ladder-like patterns on DOC-PAGE indicating some S-type LPS's and lipid A of the d-glucosamine type (Lipid AGlcN). M. bullata LPS contained mannose and glucose in major amounts and additionally l-glycero-d-mannoheptose, whereas M. segnis LPS was composed of rhamnose, mannose and glucose together with both, d-glycero-d-manno- and l-glycero-d-manno-heptoses in a molar ratio of 1:2. All LPS's contained 2-keto-3-deoxy-octonic acid (Kdo), phosphate and an unidentified acidic component X. In addition to X, M. segnis LPS contained glucuronic and galacturonic acids, whereas M. ramosa LPS contained only galacturonic acid. Acetic acid hydrolysis of the LPS resulted in splitting off lipid A moieties, very rich in 3-hydroxy fatty acids, in particular in 3-OH-12:0 (in Lipid ADAG), or in 3-OH-14:0 (in Lipid AGlcN). Analysis of the 3-acyloxyacyl residues revealed major amounts of amide-linked 3-OH(3-OH-13:0)12:0 in lipid A of M. bullata and 3-OH(12:0)12:0 in lipid A of M. segnis. The rare 4-oxo-myristic acid (4-oxo-14:0) was observed only in M. bullata LPS, where it is ester-linked. Amide linked diesters could not be traced in M. ramosa and M. dimorpha. All four lipid A's lacked erster-bound acyloxyacyl residues.Non-standard abbreviations DAG
2,3-diamino-2,3-dideoxy-d-glucose
- Kdo
2-keto-3-deoxy-octonate
- LPS
lipopolysaccharide
- PITC
phenyl isothiocyanate
- NANA
N-acetyl neuraminic acid 相似文献