全文获取类型
收费全文 | 1337篇 |
免费 | 96篇 |
出版年
2020年 | 10篇 |
2019年 | 13篇 |
2016年 | 21篇 |
2015年 | 33篇 |
2014年 | 28篇 |
2013年 | 56篇 |
2012年 | 82篇 |
2011年 | 64篇 |
2010年 | 45篇 |
2009年 | 44篇 |
2008年 | 54篇 |
2007年 | 66篇 |
2006年 | 61篇 |
2005年 | 61篇 |
2004年 | 59篇 |
2003年 | 62篇 |
2002年 | 57篇 |
2001年 | 19篇 |
2000年 | 13篇 |
1999年 | 25篇 |
1998年 | 26篇 |
1997年 | 19篇 |
1996年 | 19篇 |
1995年 | 32篇 |
1994年 | 19篇 |
1993年 | 21篇 |
1992年 | 14篇 |
1991年 | 14篇 |
1989年 | 15篇 |
1988年 | 11篇 |
1987年 | 9篇 |
1985年 | 10篇 |
1983年 | 9篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1977年 | 8篇 |
1975年 | 8篇 |
1973年 | 10篇 |
1972年 | 9篇 |
1968年 | 8篇 |
1966年 | 10篇 |
1965年 | 10篇 |
1963年 | 7篇 |
1962年 | 11篇 |
1959年 | 8篇 |
1958年 | 9篇 |
1956年 | 9篇 |
1952年 | 8篇 |
1939年 | 9篇 |
1937年 | 8篇 |
排序方式: 共有1433条查询结果,搜索用时 15 毫秒
101.
Scanlan CN Ritchie GE Baruah K Crispin M Harvey DJ Singer BB Lucka L Wormald MR Wentworth P Zitzmann N Rudd PM Burton DR Dwek RA 《Journal of molecular biology》2007,372(1):16-22
The HIV envelope has evolved a dense array of immunologically "self" carbohydrates that efficiently protect the virus from antibody recognition. Nonetheless, one broadly neutralising antibody, IgG1 2G12, has been shown to recognise a cluster of oligomannose glycans on the HIV-1 surface antigen gp120. Thus the self carbohydrates of HIV are now regarded as potential targets for viral neutralisation and vaccine design. Here, we show that chemical inhibition of mammalian glycoprotein synthesis, with the plant alkaloid kifunensine, creates multiple HIV (2G12) epitopes on the surface of previously non-antigenic self proteins and cells, including HIV gp120. This formally demonstrates the structural basis for self/non-self discrimination between viral and host glycans, by a neutralising antibody. Moreover, this study provides an alternative protein engineering approach to the design of a carbohydrate vaccine for HIV-1 by chemical synthesis. 相似文献
102.
The enteric nervous system (ENS) in vertebrate embryos is formed by neural crest-derived cells. During development, these cells undergo extensive migration from the vagal and sacral regions to colonize the entire gut, where they differentiate into neurons and glial cells. Guidance molecules like netrins, semaphorins, slits, and ephrins are known to be involved in neuronal migration and axon guidance. In the CNS, the repulsive guidance molecule (RGMa) has been implicated in neuronal differentiation, migration, and apoptosis. Recently, we described the expression of the subtypes RGMa and RGMb and their receptor neogenin during murine gut development. In the present study, we investigated the influence of RGMa on neurosphere cultures derived from fetal ENS. In functional in vitro assays, RGMa strongly inhibited neurite outgrowth of differentiating progenitors via the receptor neogenin. The repulsive effect of RGMa on processes of differentiated enteric neural progenitors could be demonstrated by collapse assay. The influence of the RGM receptor on ENS was also analyzed in neogenin knockout mice. In the adult large intestine of mutants we observed disturbed ganglia formation in the myenteric plexus. Our data indicate that RGMa may be involved in differentiation processes of enteric neurons in the murine gut. 相似文献
103.
Association of the FADS2 gene with omega-6 and omega-3 PUFA Concentration in the egg yolk of Japanese quail 总被引:1,自引:0,他引:1
Khang NT Jennen DG Tholen E Tesfaye D Mennicken L Hoelker M Schellander K Ponsuksili S Murani E Wimmers K 《Animal biotechnology》2007,18(3):189-201
This study focused on the association of polymorphisms of the FADS2 gene with fatty acid profiles in egg yolk of eight Japanese quail lines selected for high and low omega-6:omega-3 PUFA ratio (h2 = 0.36-0.38). For the identification of polymorphisms within the FADS2 gene 1350 bp of cDNA sequence were obtained encoding 404 amino acids. Five synonymous SNPs were found by comparative sequencing of animals of the high and low lines. These SNPs were genotyped by single base extension on 160 Japanese quail. The association analysis, comprising analysis of variance and family based association test (FBAT), revealed significant effects of SNP3 and SNP4 genotypes on the egg yolk fatty acid profiles, especially the omega-6 and omega-3 PUFAs (P < 0.05). No effects of the other SNPs were found - indicating that these are not in linkage disequilibrium with the causal polymorphism. The results of this study promote FADS2 as a functional candidate gene for traits related to omega-6 and omega-3 PUFA concentration in the egg yolk. 相似文献
104.
Zoltán Jászberényi Loïck Moriggi Philipp Schmidt Claudia Weidensteiner Rainer Kneuer André E. Merbach Lothar Helm Éva Tóth 《Journal of biological inorganic chemistry》2007,12(3):406-420
Generation 4 polyamidoamine (PAMAM) and, for the first time, hyperbranched poly(ethylene imine) or polyglycerol dendrimers
have been loaded with Gd3+ chelates, and the macromolecular adducts have been studied in vitro and in vivo with regard to MRI contrast agent applications.
The Gd3+ chelator was either a tetraazatetracarboxylate DOTA-pBn4− or a tetraazatricarboxylate monoamide DO3A-MA3− unit. The water exchange rate was determined from a 17O NMR and 1H Nuclear Magnetic Relaxation Dispersion study for the corresponding monomer analogues [Gd(DO3A-AEM)(H2O)] and [Gd(DOTA-pBn-NH2)(H2O)]− (k
ex298 = 3.4 and 6.6 × 106 s−1, respectively), where H3DO3A-AEM is {4-[(2-acetylaminoethylcarbamoyl)methyl]-7,10-bis(carboxymethyl-1,4,7,10-tetraazacyclododec-1-yl)}-acetic acid
and H4DOTA-pBn-NH2 is 2-(4-aminobenzyl)-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid. For the macromolecular complexes, variable-field
proton relaxivities have been measured and analyzed in terms of local and global motional dynamics by using the Lipari–Szabo
approach. At frequencies below 100 MHz, the proton relaxivities are twice as high for the dendrimers loaded with the negatively
charged Gd(DOTA-pBn)− in comparison with the analogous molecule bearing the neutral Gd(DO3A-MA). We explained this difference by the different
rotational dynamics: the much slower motion of Gd(DOTA-pBn)−-loaded dendrimers is likely related to the negative charge of the chelate which creates more rigidity and increases the overall
size of the macromolecule compared with dendrimers loaded with the neutral Gd(DO3A-MA). Attachment of poly(ethylene glycol)
chains to the dendrimers does not influence relaxivity. Both hyperbranched structures were found to be as good scaffolds as
regular PAMAM dendrimers in terms of the proton relaxivity of the Gd3+ complexes. The in vivo MRI studies on tumor-bearing mice at 4.7 T proved that all dendrimeric complexes are suitable for
angiography and for the study of vasculature parameters like blood volume and permeability of tumor vessels.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
105.
Cholesterol-dependent cytolysins (CDCs) represent a large family of conserved pore-forming toxins produced by several Gram-positive bacteria such as Listeria monocytogenes, Streptococcus pyrogenes and Bacillus anthracis. These toxins trigger a broad range of cellular responses that greatly influence pathogenesis. Using mast cells, we demonstrate that listeriolysin O (LLO), a prototype of CDCs produced by L. monocytogenes, triggers cellular responses such as degranulation and cytokine synthesis in a Ca(2+)-dependent manner. Ca(2+) signalling by LLO is due to Ca(2+) influx from extracellular milieu and release of from intracellular stores. We show that LLO-induced release of Ca(2+) from intracellular stores occurs via at least two mechanisms: (i) activation of intracellular Ca(2+) channels and (ii) a Ca(2+) channels independent mechanism. The former involves PLC-IP(3)R operated Ca(2+) channels activated via G-proteins and protein tyrosine kinases. For the latter, we propose a novel mechanism of intracellular Ca(2+) release involving injury of intracellular Ca(2+) stores such as the endoplasmic reticulum. In addition to Ca(2+) signalling, the discovery that LLO causes damage to an intracellular organelle provides a new perspective in our understanding of how CDCs affect target cells during infection by the respective bacterial pathogens. 相似文献
106.
Mariusz A. Bromke Anton Hochmuth Takayuki Tohge Alisdair R. Fernie Patrick Giavalisco Asdrubal Burgos Lothar Willmitzer Yariv Brotman 《The Plant journal : for cell and molecular biology》2015,81(3):529-536
Quantification of fatty acids has been crucial to elucidate lipid biosynthesis pathways in plants. To date, fatty acid identification and quantification has relied mainly on gas chromatography (GC) coupled to flame ionization detection (FID) or mass spectrometry (MS), which requires the derivatization of samples and the use of chemical standards for annotation. Here we present an alternative method based on a simple procedure for the hydrolysis of lipids, so that fatty acids can be quantified by liquid chromatography mass spectrometry (LC‐MS) analysis. Proper peak annotation of the fatty acids in the LC‐MS‐based methods has been achieved by LC‐MS measurements of authentic standard compounds and elemental formula annotation supported by 13C isotope‐labeled Arabidopsis. As a proof of concept, we have compared the analysis by LC‐MS and GC‐FID of two previously characterized Arabidopsis thaliana knock‐out mutants for FAD6 and FAD7 desaturase genes. These results are discussed in light of lipidomic profiles obtained from the same samples. In addition, we performed untargeted LC‐MS analysis to determine the fatty acid content of two diatom species. Our results indicate that both LC‐MS and GC‐FID analyses are comparable, but that because of higher sensitivity and selectivity the LC‐MS‐based method allows for a broader coverage and determination of novel fatty acids. 相似文献
107.
Mollá-Morales A Sarmiento-Mañús R Robles P Quesada V Pérez-Pérez JM González-Bayón R Hannah MA Willmitzer L Ponce MR Micol JL 《The Plant journal : for cell and molecular biology》2011,65(3):335-345
Arabidopsis thaliana reticulate mutants exhibit differential pigmentation of the veinal and interveinal leaf regions, a visible phenotype that often indicates impaired mesophyll development. We performed a metabolomic analysis of one ven6 (venosa6) and three ven3 reticulate mutants that revealed altered levels of arginine precursors, namely increased ornithine and reduced citrulline levels. In addition, the mutants were more sensitive than the wild-type to exogenous ornithine, and leaf reticulation and mesophyll defects of these mutants were completely rescued by exogenous citrulline. Taken together, these results indicate that ven3 and ven6 mutants experience a blockage of the conversion of ornithine into citrulline in the arginine pathway. Consistent with the participation of VEN3 and VEN6 in the same pathway, the morphological phenotype of ven3 ven6 double mutants was synergistic. Map-based cloning showed that the VEN3 and VEN6 genes encode subunits of Arabidopsis carbamoyl phosphate synthetase (CPS), which is assumed to be required for the conversion of ornithine into citrulline in arginine biosynthesis. Heterologous expression of the Arabidopsis VEN3 and VEN6 genes in a CPS-deficient Escherichia coli strain fully restored bacterial growth in minimal medium, demonstrating the enzymatic activity of the VEN3 and VEN6 proteins, and indicating a conserved role for CPS in these distinct and distant species. Detailed study of the reticulate leaf phenotype in the ven3 and ven6 mutants revealed that mesophyll development is highly sensitive to impaired arginine biosynthesis. 相似文献
108.
Giavalisco P Li Y Matthes A Eckhardt A Hubberten HM Hesse H Segu S Hummel J Köhl K Willmitzer L 《The Plant journal : for cell and molecular biology》2011,68(2):364-376
The unbiased and comprehensive analysis of metabolites in any organism presents a major challenge if proper peak annotation and unambiguous assignment of the biological origin of the peaks are required. Here we provide a comprehensive multi-isotope labelling-based strategy using fully labelled (13) C, (15) N and (34) S plant tissues, in combination with a fractionated metabolite extraction protocol. The extraction procedure allows for the simultaneous extraction of polar, semi-polar and hydrophobic metabolites, as well as for the extraction of proteins and starch. After labelling and extraction, the metabolites and lipids were analysed using a high-resolution mass spectrometer providing accurate MS and all-ion fragmentation data, providing an unambiguous readout for every detectable isotope-labelled peak. The isotope labelling assisted peak annotation process employed can be applied in either an automated database-dependent or a database-independent analysis of the plant polar metabolome and lipidome. As a proof of concept, the developed methods and technologies were applied and validated using Arabidopsis thaliana leaf and root extracts. Along with a large repository of assigned elemental compositions, which is provided, we show, using selected examples, the accuracy and reliability of the developed workflow. 相似文献
109.
Haybaeck J Heikenwalder M Klevenz B Schwarz P Margalith I Bridel C Mertz K Zirdum E Petsch B Fuchs TJ Stitz L Aguzzi A 《PLoS pathogens》2011,7(1):e1001257
Prions, the agents causing transmissible spongiform encephalopathies, colonize the brain of hosts after oral, parenteral, intralingual, or even transdermal uptake. However, prions are not generally considered to be airborne. Here we report that inbred and crossbred wild-type mice, as well as tga20 transgenic mice overexpressing PrP(C), efficiently develop scrapie upon exposure to aerosolized prions. NSE-PrP transgenic mice, which express PrP(C) selectively in neurons, were also susceptible to airborne prions. Aerogenic infection occurred also in mice lacking B- and T-lymphocytes, NK-cells, follicular dendritic cells or complement components. Brains of diseased mice contained PrP(Sc) and transmitted scrapie when inoculated into further mice. We conclude that aerogenic exposure to prions is very efficacious and can lead to direct invasion of neural pathways without an obligatory replicative phase in lymphoid organs. This previously unappreciated risk for airborne prion transmission may warrant re-thinking on prion biosafety guidelines in research and diagnostic laboratories. 相似文献
110.
Alderwick LJ Lloyd GS Ghadbane H May JW Bhatt A Eggeling L Fütterer K Besra GS 《PLoS pathogens》2011,7(2):e1001299
The D-arabinan-containing polymers arabinogalactan (AG) and lipoarabinomannan (LAM) are essential components of the unique cell envelope of the pathogen Mycobacterium tuberculosis. Biosynthesis of AG and LAM involves a series of membrane-embedded arabinofuranosyl (Araf) transferases whose structures are largely uncharacterised, despite the fact that several of them are pharmacological targets of ethambutol, a frontline drug in tuberculosis therapy. Herein, we present the crystal structure of the C-terminal hydrophilic domain of the ethambutol-sensitive Araf transferase M. tuberculosis EmbC, which is essential for LAM synthesis. The structure of the C-terminal domain of EmbC (EmbC(CT)) encompasses two sub-domains of different folds, of which subdomain II shows distinct similarity to lectin-like carbohydrate-binding modules (CBM). Co-crystallisation with a cell wall-derived di-arabinoside acceptor analogue and structural comparison with ligand-bound CBMs suggest that EmbC(CT) contains two separate carbohydrate binding sites, associated with subdomains I and II, respectively. Single-residue substitution of conserved tryptophan residues (Trp868, Trp985) at these respective sites inhibited EmbC-catalysed extension of LAM. The same substitutions differentially abrogated binding of di- and penta-arabinofuranoside acceptor analogues to EmbC(CT), linking the loss of activity to compromised acceptor substrate binding, indicating the presence of two separate carbohydrate binding sites, and demonstrating that subdomain II indeed functions as a carbohydrate-binding module. This work provides the first step towards unravelling the structure and function of a GT-C-type glycosyltransferase that is essential in M. tuberculosis. 相似文献