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排序方式: 共有471条查询结果,搜索用时 31 毫秒
41.
Genomic blueprint of Hahella chejuensis, a marine microbe producing an algicidal agent 总被引:5,自引:0,他引:5
Jeong H Yim JH Lee C Choi SH Park YK Yoon SH Hur CG Kang HY Kim D Lee HH Park KH Park SH Park HS Lee HK Oh TK Kim JF 《Nucleic acids research》2005,33(22):7066-7073
Harmful algal blooms, caused by rapid growth and accumulation of certain microalgae in the ocean, pose considerable impacts on marine environments, aquatic industries and even public health. Here, we present the 7.2-megabase genome of the marine bacterium Hahella chejuensis including genes responsible for the biosynthesis of a pigment which has the lytic activity against a red-tide dinoflagellate. H.chejuensis is the first sequenced species in the Oceanospiralles clade, and sequence analysis revealed its distant relationship to the Pseudomonas group. The genome was well equipped with genes for basic metabolic capabilities and contained a large number of genes involved in regulation or transport as well as with characteristics as a marine heterotroph. Sequence analysis also revealed a multitude of genes of functional equivalence or of possible foreign origin. Functions encoded in the genomic islands include biosynthesis of exopolysacchrides, toxins, polyketides or non-ribosomal peptides, iron utilization, motility, type III protein secretion and pigmentation. Molecular structure of the algicidal pigment, which was determined through LC-ESI-MS/MS and NMR analyses, indicated that it is prodigiosin. In conclusion, our work provides new insights into mitigating algal blooms in addition to genetic make-up, physiology, biotic interactions and biological roles in the community of a marine bacterium. 相似文献
42.
The gene product of EFHC1 recently implicated in juvenile myoclonic epilepsy (JME) was found to be a homolog of Chlamydomonas axonemal protein Rib72, whose homologs are present in a wide variety of organisms that have motile cilia and flagella. Western blot analyses and immunofluorescence localization of the mouse ortholog mRib72-1/Efhc1 indicated that it is indeed abundantly present in sperm flagella and tracheal cilia but only in a small amount in the brain. It is not present in immotile primary cilia. These observations raise the possibility that malfunction of motile cilia is involved in the development of JME. 相似文献
43.
Lee KO Luu N Kaneski CR Schiffmann R Brady RO Murray GJ 《Biochemical and biophysical research communications》2005,337(2):701-707
Enzyme replacement therapy (ERT) for Gaucher disease designed to target glucocerebrosidase (GC) to macrophages via mannose-specific endocytosis is very effective in reversing hepatosplenomegaly, and normalizing hematologic parameters but is less effective in improving bone and lung involvement and ineffective in brain. Recombinant GCs containing an in-frame fusion to the HIV-1 trans-activator protein transduction domain (TAT) were expressed in eukaryotic cells in order to obtain active, normally glycosylated GC fusion proteins for enzyme uptake studies. Despite the absence of mannose-specific endocytic receptors on the plasma membranes of various fibroblasts, the recombinant GCs with C-terminal TAT fusions were readily internalized by these cells. Immunofluorescent confocal microscopy demonstrated the recombinant TAT-fusion proteins with a mixed endosomal and lysosomal localization. Thus, TAT-modified GCs represent a novel strategy for a new generation of therapeutic enzymes for ERT for Gaucher disease. 相似文献
44.
Ko MS Lee UH Kim SI Kim HJ Park JJ Cha SJ Kim SB Song H Chung DK Han IS Kwack K Park JW 《Archives of biochemistry and biophysics》2004,422(2):137-144
Developmentally regulated GTP-binding protein (DRG) is a new subfamily within the superfamily of GTP-binding proteins. Its expression is regulated during embryonic development. To investigate the effect of the expression of DRG2 on cell growth, we constructed a human Jurkat-T-cell line that overexpresses DRG2. Overexpression of DRG2 suppressed the growth and the aggregation of Jurkat cells but did not induce apoptotic cell death. We used cDNA microarray analysis to examine the global changes in gene expression induced by an overexpression of DRG2. DNA array analyses identified genes that may suppress cell growth at a number of levels in multiple signaling cascades in Jurkat cells and also several prosurvival genes that may protect cells from apoptosis. 相似文献
45.
46.
Pawar P Shin PK Mousa SA Ross JM Konstantopoulos K 《Journal of immunology (Baltimore, Md. : 1950)》2004,173(2):1258-1265
The interaction between surface components on the invading pathogen and host cells such as platelets plays a key role in the regulation of endovascular infections. However, the mechanisms mediating Staphylococcus aureus binding to platelets under shear remain largely unknown. This study was designed to investigate the kinetics and molecular requirements of platelet-S. aureus interactions in bulk suspensions subjected to a uniform shear field. Hydrodynamic shear-induced collisions augment platelet-S. aureus binding, which is further potentiated by platelet activation with stromal derived factor-1beta. Peak adhesion efficiency occurs at low shear (100 s(-1)) and decreases with increasing shear. The molecular interaction of platelet alpha(IIb)beta(3) with bacterial clumping factor A through fibrinogen bridging is necessary for stable bacterial binding to activated platelets under shear. Although this pathway is sufficient at low shear (=400 s(-1)), the involvement of platelet gpIb and staphylococcal protein A through von Willebrand factor bridging is essential for optimal recruitment of S. aureus cells by platelets in the high shear regime. IgG plays an inhibitory role in the adhesion process, presumably by interfering with the binding of von Willebrand factor to staphylococcal protein A. This study demonstrates that platelet activation and a fluid-mechanical environment representative of the vasculature affect platelet-S. aureus cell-adhesive interactions pertinent to the process of S. aureus-induced bloodstream infections. 相似文献
47.
Ri-Zhong Zeng Han Geun Kim Na Ra Kim Hae Young Lee Bong Jun Jung Mi Yeon Ko Seung Yeon Lee Dae Kyun Chung 《Molecules and cells》2010,29(6):585-594
Lipoteichoic acid (LTA) from Staphylococcus aureus (aLTA) and from Lactobacillus plantarum LTA (pLTA) are both recognized by Toll-like receptor 2 (TLR2), but cause different stimulatory effects on the innate immune
and inflammatory responses, and their underlying cellular mechanisms are unknown. In this study, comparative proteome analysis
was performed using two-dimensional gel electrophoresis and mass spectrometry on protein extracts from human monocyte THP-1
cells stimulated with either aLTA or pLTA. Differentially expressed proteins might be involved in innate immunity and inflammation.
Cells treated with aLTA and with pLTA showed different protein expression profiles. Of 60 identified proteins, 10 were present
only in treated cells (8 in aLTA-treated only, and 2 in pLTA-treated only), 1 protein (IMPDH2) was suppressed by pLTA, and
49 were up- or down-regulated more than three-fold by aLTA- or pLTA- stimulation. Several proteins involved in immunity or
inflammation, antioxidation, or RNA processing were significantly changed in expression by aLTA- or pLTA-stimulation, including
cyclophilin A, HLA-B27, D-dopachrome tautomerase, Mn- SOD, hnRNP-C, PSF and KSRP. These data demonstrated that aLTA and pLTA
had different effects on the protein profile of THP-1 cells. Comparison of the proteome alterations will provide candidate
biomarkers for further investigation of the immunomodulatory effects of aLTA and pLTA, and the involvement of aLTA in the
pathogenesis of Staphylococcus aureus sepsis. 相似文献
48.
Eun-Shik Kim Dong Kyun Park Xueyong Zhao Sun Kee Hong Kang Suk Koh Min Hwan Suh Young Sun Kim 《Ecological Research》2006,21(6):907-911
Asian dusts, yellow sand, or dust and sand storms (DSS) in Asian continent are the end products of desertification, which
became a regional environmental problem being aggravated by time. It is closely related to an issue of sustainability in the
region. As the desertification is caused not only by natural factors, such as the climate change, strong wind, and low precipitation,
but also by rapidly increasing human activities, such as overgrazing, misuse of water resources, and irrational land use,
it is urgent to make efforts to combat desertification in Asian continent including China. In this regard, it is necessary
to consider socio-economic aspects as well as ecological aspects and, consequently, the project for the construction of a
Demonstration Model Village for eco-environmental rehabilitation should be paid to a special attention. The authors deal with
this regional issue in consideration of three Es, which are represented by ecology, economy, and environment in providing
the perspectives in sound approach to the issue. As an approach to the issue of Asian dusts and desertification in Asian continent,
this Eco-Village study provides one way forward. 相似文献
49.
Thyroid hormones (THs) play crucial roles in various developmental and physiological processes in vertebrates, including squamate reptiles. The effect of THs on shedding frequency is interesting in Squamata, since the effects on lizards are quite the reverse of those in snakes: injection of thyroxine increases shedding frequency in lizards, but decreases it in snakes. However, the mechanism underlying this differential effect remains unclear. To facilitate the investigation of the molecular mechanism of the physiological functions of THs in Squamata, their two specific receptor (TRalpha and beta) cDNAs, which are members of the nuclear hormone receptor superfamily, were cloned from a lizard, the leopard gecko, Eublepharis macularius. This is the first molecular cloning of thyroid hormone receptors (TRs) from reptiles. The deduced amino acid sequences showed high identity with those of other species, especially in the C and E/F domains, which are characteristic domains in nuclear hormone receptors. Expression analysis revealed that TRs were widely expressed in many tissues and organs, as in other animals. To analyze their role in the skin, temporal expression analysis was performed by RT-PCR, revealing that the two TRs had opposing expression patterns: TRalpha was expressed more strongly after than before skin shedding, whereas TRbeta was expressed more strongly before than after skin shedding. This provides good evidence that THs play important roles in the skin, and that the roles of their two receptor isoforms are distinct from each other. 相似文献
50.
Jang HH Kim SY Park SK Jeon HS Lee YM Jung JH Lee SY Chae HB Jung YJ Lee KO Lim CO Chung WS Bahk JD Yun DJ Cho MJ Lee SY 《FEBS letters》2006,580(1):351-355
The H2O2-catabolizing peroxidase activity of human peroxiredoxin I (hPrxI) was previously shown to be regulated by phosphorylation of Thr90. Here, we show that hPrxI forms multiple oligomers with distinct secondary structures. HPrxI is a dual function protein, since it can behave either as a peroxidase or as a molecular chaperone. The effects of phosphorylation of hPrxI on its protein structure and dual functions were determined using site-directed mutagenesis, in which the phosphorylation site was substituted with aspartate to mimic the phosphorylated status of the protein (T90D-hPrxI). Phosphorylation of the protein induces significant changes in its protein structure from low molecular weight (MW) protein species to high MW protein complexes as well as its dual functions. In contrast to the wild type (WT)- and T90A-hPrxI, the T90D-hPrxI exhibited a markedly reduced peroxidase activity, but showed about sixfold higher chaperone activity than WT-hPrxI. 相似文献