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71.
Kaoru Umeda Yoshiyuki Seto Tomoko Kohda Masafumi Mukamoto Shunji Kozaki 《Microbiology and immunology》2010,54(5):308-312
A rapid, simple and sensitive multiplex PCR method for boNT/A gene cluster typing was developed by combining the results of BoNT/A subtype (boNT/A1 or /A2) gene detection with ha33 and/or p47 gene detection. Ten isolates associated with infant botulism in Japan were examined and divided into boNT/A gene cluster types 2 and 3 by origin (honey feeding or not) and period (1986–1987 or 1999–2007). It is suggested that this multiplex PCR method will be be useful for epidemiological studies of botulism. 相似文献
72.
The Arabidopsis genome encodes 10 D-type cyclins (CYCD); however, their differential role in cell cycle control is not well known. Among them, CYCD4;2 is unique in the amino acid sequence; namely, it lacks the Rb-binding motif and the PEST sequence that are conserved in CYCDs. Here, we have shown that CYCD4;2 suppressed G1 cyclin mutations in yeast and formed a kinase complex with CDKA;1, an ortholog of yeast Cdc28, in insect cells. Hypocotyl explants of CYCD4;2 over-expressing plants showed faster induction of calli than wild-type explants on a medium containing lower concentration of auxin. These results suggest that CYCD4;2 has a promotive function in cell division by interacting with CDKA;1 regardless of the unusual primary sequence. 相似文献
73.
Hasegawa T Umeda M Numata M Li C Bae AH Fujisawa T Haraguchi S Sakurai K Shinkai S 《Carbohydrate research》2006,341(1):35-40
(1-->3)-beta-D-Glucans having various functional appendages (lactoside, ferrocene, pyrene, and porphyrin) can be prepared in an convenient, quantitative, and regioselective manner through regioselective bromination-azidation of curdlan to afford 6-azido-6-deoxycurdlan followed by chemoselective [3+2]-cycloadditions with various functional modules bearing a terminal alkyne group. The ability to monitor reaction conversions is an additional advantage of this synthetic approach over the conventional direct modifications on polysaccharides; the reaction can be readily monitored based on the intensity of azido peaks in the in situ attenuated total reflection infrared spectra. 相似文献
74.
Ikenouchi J Suzuki M Umeda K Ikeda K Taguchi R Kobayashi T Sato SB Kobayashi T Stolz DB Umeda M 《The Journal of biological chemistry》2012,287(12):9525-9533
The role of tight junctions (TJs) in the establishment and maintenance of lipid polarity in epithelial cells has long been a subject of controversy. We have addressed this issue using lysenin, a toxin derived from earthworms, and an influenza virus labeled with a fluorescent lipid, octadecylrhodamine B (R18). When epithelial cells are stained with lysenin, lysenin selectively binds to their apical membranes. Using an artificial liposome, we demonstrated that lysenin recognizes the membrane domains where sphingomyelins are clustered. Interestingly, lysenin selectively stained the apical membranes of epithelial cells depleted of zonula occludens proteins (ZO-deficient cells), which completely lack TJs. Furthermore, the fluorescent lipid inserted into the apical membrane by fusion with the influenza virus did not diffuse to the lateral membrane in ZO-deficient epithelial cells. This study revealed that sphingomyelin-cluster formation occurs only in the apical membrane and that lipid polarity is maintained even in the absence of TJs. 相似文献
75.
Yamaguchi F Umeda Y Shimamoto S Tsuchiya M Tokumitsu H Tokuda M Kobayashi R 《The Journal of biological chemistry》2012,287(17):13787-13798
PP5 is a unique member of serine/threonine phosphatases comprising a regulatory tetratricopeptide repeat (TPR) domain and functions in signaling pathways that control many cellular responses. We reported previously that Ca(2+)/S100 proteins directly associate with several TPR-containing proteins and lead to dissociate the interactions of TPR proteins with their client proteins. Here, we identified protein phosphatase 5 (PP5) as a novel target of S100 proteins. In vitro binding studies demonstrated that S100A1, S100A2, S100A6, and S100B proteins specifically interact with PP5-TPR and inhibited the PP5-Hsp90 interaction. In addition, the S100 proteins activate PP5 by using a synthetic phosphopeptide and a physiological protein substrate, Tau. Overexpression of S100A1 in COS-7 cells induced dephosphorylation of Tau. However, S100A1 and permanently active S100P inhibited the apoptosis signal-regulating kinase 1 (ASK1) and PP5 interaction, resulting the inhibition of dephosphorylation of phospho-ASK1 by PP5. The association of the S100 proteins with PP5 provides a Ca(2+)-dependent regulatory mechanism for the phosphorylation status of intracellular proteins through the regulation of PP5 enzymatic activity or PP5-client protein interaction. 相似文献
76.
77.
Doukas J Mahesh S Umeda N Kachi S Akiyama H Yokoi K Cao J Chen Z Dellamary L Tam B Racanelli-Layton A Hood J Martin M Noronha G Soll R Campochiaro PA 《Journal of cellular physiology》2008,216(1):29-37
Age-related macular degeneration, diabetic retinopathy, and retinal vein occlusions are complicated by neovascularization and macular edema. Multi-targeted kinase inhibitors that inhibit select growth factor receptor tyrosine kinases and/or components of their down-stream signaling cascades (such as Src kinases) are rationale treatment strategies for these disease processes. We describe the discovery and characterization of two such agents. TG100572, which inhibits Src kinases and selected receptor tyrosine kinases, induced apoptosis of proliferating endothelial cells in vitro. Systemic delivery of TG100572 in a murine model of laser-induced choroidal neovascularization (CNV) caused significant suppression of CNV, but with an associated weight loss suggestive of systemic toxicity. To minimize systemic exposure, topical delivery of TG100572 to the cornea was explored, and while substantial levels of TG100572 were achieved in the retina and choroid, superior exposure levels were achieved using TG100801, an inactive prodrug that generates TG100572 by de-esterification. Neither TG100801 nor TG100572 were detectable in plasma following topical delivery of TG100801, and adverse safety signals (such as weight loss) were not observed even with prolonged dosing schedules. Topical TG100801 significantly suppressed laser-induced CNV in mice, and reduced fluorescein leakage from the vasculature and retinal thickening measured by optical coherence tomography in a rat model of retinal vein occlusion. These data suggest that TG100801 may provide a new topically applied treatment approach for ocular neovascularization and retinal edema. 相似文献
78.
Osakabe M Isobe H Kasai A Masuda R Kubota S Umeda M 《Experimental & applied acarology》2008,44(3):165-183
Aerial dispersal may be important for redistribution of spider mites into new habitats. Evidence for behavioral control of
aerial take-off has been well documented for Tetranychus urticae Koch. Before aerial dispersal they exhibit the aerial take-off posture that involves lifting the forelegs upright and raising
the forebody. However, whether the aerial take-off posture functions to increase drag has remained unclear. The objectives
of this study were to clarify: (i) aerodynamic effects of the aerial take-off posture; and (ii) actual aerial take-off behavior
in T. urticae. To evaluate the aerodynamic forces experienced by grounded spider mites in different postures, we constructed three-dimensional
models of T. urticae, exhibiting the aerial take-off posture and the normal posture, using computer graphics. We found that the aerial take-off
posture was effective in receiving greater rearward forces from wind rather than upward forces. As a result, aerial take-off
from a horizontal platform is unlikely. Instead, inverted departure surfaces, e.g., lower leaf surfaces, with inclines are
likely to be effective sites for take-off. Laboratory experiments and field observations indicated that the mites preferentially
adopted such a position for orientation and take-off. Our findings provided a rationale for the take-off behavior of Tetranychus spider mites. 相似文献
79.
80.
Flagellation of Pseudomonas aeruginosa during the cell division cycle was examined by scanning electron microscopy. A new flagellum grows on an old polar end located at the opposite position of the parental flagellum in the late stage of the cell cycle. 相似文献