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81.
Enzymatic activities of uridine and thymidine phosphorylase in normal and cancerous uterine cervical tissues 总被引:1,自引:0,他引:1
Kobayashi Y Wada Y Ohara T Okuda Y Suzuki N Hasegawa K Kiguchi K Ishizuka B 《Human cell》2007,20(4):107-110
In this study, the preliminary analyses were conducted of enzymatic activities of uridine phosphorylase (UP) and thymidine phosphorylase (TP) in normal tissues and cancer tissues of the uterine cervix. The study was performed on 27 patients of cervical cancer, treated first in our hospital. Normal cervical tissues obtained from 15 patients undergoing hysterectomy for benign diseases were used as controls. The supernatant of the homogenated cervical tissues and the stroma (5-FU and ribose-1-P or deoxyribose-1-P) were analyzed by high performance liquid chromatography, and then the UP and TP activities calculated. TP activity was significantly greater than UP activity (P < 0.0001). Both UP and TP showed significantly greater activity in cancer tissues than in normal tissues (P < 0.0001). In the TP activity of the cancer tissues, there was no significant difference among the histological types, while the TP activity tended to be significantly higher in the cases with lymph node metastasis. These results showed that the TP-mediated route seemed important as the 5FU metabolic pathway in the uterine cervical tissues, and TP enzymatic activity might be associated with lymph node metastasis. 相似文献
82.
Improved immunocytochemical detection of daunomycin 总被引:3,自引:3,他引:0
Improved immunocytochemical (ICC) detection of the anthracycline anticancer antibiotic daunomycin (DM) has been achieved by
use of hydrogen peroxide oxidation prior to ICC staining for DM. The new method greatly enhanced the localization of DM accumulation
in cardiac, smooth and skeletal muscle of rats after a single i.v. dose of the drug. DM accumulated in the nuclei as well
as in the sarcoplasm, where it occurred in the form of small granules, which were particularly evident in cardiac muscle cells.
The distribution of the granules coincided with that of mitochondria. Uptake of DM in nuclei and mitochondria of heart muscle
cells may help to improve our understanding of the cardiac toxicity of DM and related anthracyclin antibiotics. A number of
ELISA tests were carried out in order to elucidate the mechanims of H2O2−assisted antigen retrieval. A possible mechanism is that DM is reduced and converted to its semiquinone and/or hydroquinone
derivative in vivo. Oxidation by hydrogen peroxide acts to convert these derivatives back to the native antigen. The improved
ICC methodology using oxidation to recreate native antigens from reduced metabolites may be helpful also with respect to the
localization of other drugs. 相似文献
83.
Suzuki N Shiota T Watanabe F Haga N Murashi T Ohara T Matsuo K Oomori N Yari H Dohi K Inoue M Iguchi M Sentou J Wada T 《Bioorganic & medicinal chemistry letters》2011,21(6):1601-1606
A structure-activity relationship study of 4-anilinopyrimidines for dual EGFR/Her-2 inhibitor has resulted in the identification of 4-anilino-5-alkenyl or 5-alkynyl-6-methylpyrimidine derivatives that have exhibited effective inhibitory activity against both enzymes. The presence of 5-alkenyl or 5-alkynyl moiety bearing terminal hydrophilic group played important role for inhibition of these enzymes. Selected compounds in the series demonstrated some activity against Her-2 dependent cell line (BT474). 相似文献
84.
12-oxo-phytodienoic acid triggers expression of a distinct set of genes and plays a role in wound-induced gene expression in Arabidopsis
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85.
Lima ES Bonini MG Augusto O Barbeiro HV Souza HP Abdalla DS 《Free radical biology & medicine》2005,39(4):532-539
Nitric oxide-derived oxidants such as nitrogen dioxide and peroxynitrite have been receiving increasing attention as mediators of nitric oxide toxicity. Indeed, nitrated and nitrosated compounds have been detected in biological fluids and tissues of healthy subjects and in higher yields in patients under inflammatory or infectious conditions as a consequence of nitric oxide overproduction. Among them, nitrated lipids have been detected in vivo. Here, we confirmed and extended previous studies by demonstrating that nitrolinoleate, chlolesteryl nitrolinoleate, and nitrohydroxylinoleate induce vasorelaxation in a concentration-dependent manner while releasing nitric oxide that was characterized by chemiluminescence-and EPR-based methodologies. As we first show here, diffusible nitric oxide production is likely to occur by isomerization of the nitrated lipids to the corresponding nitrite derivatives that decay through homolysis and/or metal ion/ascorbate-assisted reduction. The homolytic mechanism was supported by EPR spin-trapping studies with 3,5-dibromo-4-nitrosobenzenesulfonic acid that trapped a lipid-derived radical during nitrolinoleate decomposition. In addition to provide a mechanism to explain nitric oxide production from nitrated lipids, the results support their role as endogenous sources of nitric oxide that may play a role in endothelium-independent vasorelaxation. 相似文献
86.
87.
Terada N Ohno N Yamakawa H Ohara O Liao X Baba T Ohno S 《Histochemistry and cell biology》2005,124(3-4):303-311
Protein 4.1 families have recently been established as potential organizers of an adherens system. In the adult mouse testis,
protein 4.1G (4.1G) localized as a line pattern in both basal and adluminal compartments of the seminiferous tubules, attaching
regions of germ cells and Sertoli cells. By double staining for 4.1G and F-actin, their localizations were shown to be different,
indicating that 4.1G was localized in a region other than the basal and apical ectoplasmic specializations, which formed the
Sertoli–Sertoli cell junction and Sertoli–spermatid junction, respectively. By electron microscopy, immunoreactive products
were seen exclusively on the cell membranes of Sertoli cells, attaching to the various differentiating germ cells. The immunolocalization
of cadherin was identical to that of 4.1G, supporting the idea that 4.1G may be functionally interconnected with adhesion
molecules. In an experimental mouse model of cadmium treatment, in which tight and adherens junctions of seminiferous tubules
were disrupted, the 4.1G immunostaining in the seminiferous tubules was dramatically decreased. These results indicate that
4.1G may have a basic adhesive function between Sertoli cells and germ cells from the side of Sertoli cells. 相似文献
88.
Protein 4.1 G localizes in rodent microglia 总被引:2,自引:2,他引:0
Ohno N Terada N Tanaka J Yokoyama A Yamakawa H Fujii Y Baba T Ohara O Ohno S 《Histochemistry and cell biology》2005,124(6):477-486
Although it was reported that protein 4.1 G, a cytoskeletal protein characterized by its general expression in the body, interacts
with some signal transduction molecules in the central nervous system (CNS), its distribution and significance in vivo remained
to be elucidated. In the present study, we have identified 4.1 G-positive cells in the rodent CNS, and demonstrated its immunolocalization
in the developing mouse CNS. In the rodent CNS, 4.1 G was colocalized with markers for microglia, such as CD45, OX-42 and
ionized calcium-binding adapter molecule 1 (Iba1), but not with markers for neuronal or other glial cells. Additionally, colocalization
of 4.1 G and A1 adenosine receptor was observed in the mouse cerebrum. In a mixed glial culture, most OX-42-positive microglia
were positive for 4.1 G, and 4.1 G isoforms of the same molecular weight as in the rat brain were expressed in cultured microglia,
where 4.1 G mRNA was detected by RT-PCR. In the developing mouse cerebral cortex, 4.1 G was detected in immature microglia,
which were positive for Iba1. These results indicate that 4.1 G in the CNS is mainly distributed in microglia in vivo. Considering
the interactions between 4.1 G and the signal transduction molecules, putative roles have been propsed for 4.1 G in microglial
functions in the CNS. 相似文献
89.
Morii Y Matsuda H Ohara K Hashimoto M Miyairi K Okuno T 《Bioorganic & medicinal chemistry》2005,13(17):5113-5144
Glycosylation reactions of 5-thioglucopyranosyl trichloroacetimidates bearing ethereal protective groups at the 2-O-position 14-15, and 37 proceed smoothly to give alpha-glycosides stereoselectively by using a catalytic amount of silyl triflate. This methodology allowed us to achieve syntheses of sulfur-substituted isomaltotetraoside 2 and maltotetraoside 3. These studies also revealed that benzoyl-protected 5-thioglucopyranosyl trichloroacetimidate 12 underwent beta-selective glycosylation with C6-OH glucopyranosyl acceptors upon activation by BF3OEt2. This was applied for preparation of sulfur-substituted gentiobiosides 1 and 46. 相似文献
90.
Genomewide high-density SNP linkage analysis of 236 Japanese families supports the existence of schizophrenia susceptibility loci on chromosomes 1p, 14q, and 20p 总被引:2,自引:1,他引:1
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Arinami T Ohtsuki T Ishiguro H Ujike H Tanaka Y Morita Y Mineta M Takeichi M Yamada S Imamura A Ohara K Shibuya H Ohara K Suzuki Y Muratake T Kaneko N Someya T Inada T Yoshikawa T Toyota T Yamada K Kojima T Takahashi S Osamu O Shinkai T Nakamura M Fukuzako H Hashiguchi T Niwa SI Ueno T Tachikawa H Hori T Asada T Nanko S Kunugi H Hashimoto R Ozaki N Iwata N Harano M Arai H Ohnuma T Kusumi I Koyama T Yoneda H Fukumaki Y Shibata H Kaneko S Higuchi H Yasui-Furukori N Numachi Y Itokawa M 《American journal of human genetics》2005,77(6):937-944
The Japanese Schizophrenia Sib-Pair Linkage Group (JSSLG) is a multisite collaborative study group that was organized to create a national resource for affected sib pair (ASP) studies of schizophrenia in Japan. We used a high-density single-nucleotide–polymorphism (SNP) genotyping assay, the Illumina BeadArray linkage mapping panel (version 4) comprising 5,861 SNPs, to perform a genomewide linkage analysis of JSSLG samples comprising 236 Japanese families with 268 nonindependent ASPs with schizophrenia. All subjects were Japanese. Among these families, 122 families comprised the same subjects analyzed with short tandem repeat markers. All the probands and their siblings, with the exception of seven siblings with schizoaffective disorder, had schizophrenia. After excluding SNPs with high linkage disequilibrium, we found significant evidence of linkage of schizophrenia to chromosome 1p21.2-1p13.2 (LOD=3.39) and suggestive evidence of linkage to 14q11.2 (LOD=2.87), 14q11.2-q13.2 (LOD=2.33), and 20p12.1-p11.2 (LOD=2.33). Although linkage to these regions has received little attention, these regions are included in or partially overlap the 10 regions reported by Lewis et al. that passed the two aggregate criteria of a meta-analysis. Results of the present study—which, to our knowledge, is the first genomewide analysis of schizophrenia in ASPs of a single Asian ethnicity that is comparable to the analyses done of ASPs of European descent—indicate the existence of schizophrenia susceptibility loci that are common to different ethnic groups but that likely have different ethnicity-specific effects. 相似文献