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91.
Human T cell responses to recombinant mite antigens of Dermatophagoides farinae 总被引:1,自引:0,他引:1 下载免费PDF全文
We studied T cell responses to four glutathione S transferase (GST)-fused mite antigens prepared in our laboratory using peripheral blood lymphocytes from mite-sensitive patients with bronchial asthma. Of the four recombinant antigens, purified GST-Mag3 had the strongest ability to cause patients' lymphocytes to proliferate, and its potency was almost comparable to that of crude mite bodies (Dfb) and faeces (Dff) antigens and a purified major antigen, Der f 2. The responder lymphocytes were mainly T cells, because the proliferative response was depleted by the treatment of lymphocytes with anti-CD3 antibody and complement, but not with anti-CD20 antibody and complement. The responsiveness of lymphocytes to GST-Mag3 correlated with that to Der f 2, but GST-Mag3 displayed slightly higher activity to stimulate lymphocytes than Der f 2. Simultaneously, the levels of Dff- and GST-Mag3-specific IgE antibodies correlated with the responsiveness of lymphocytes to GST-Mag3. These results suggest that Mag3 is a new valuable antigen for the response of T cell proliferation in mite-sensitive patients. 相似文献
92.
In recent years, a growing interest in the study of peptide antigenicity in relation to the role of flanking sequences and protein topology in processing, presentation, and recognition has been observed. However, the information available on the antigenicity of recombinant fusion proteins and their effect on the selection of antigen receptor repertoires is limited. To analyze the role of molecular topology of T epitopes in a system relevant to human pathology, we have used the bacterially expressed Schistosoma japonicum glutathione S transferase (GST) to construct recombinant antigens containing HIV-1 derived T cell determinants, and human T cell clones specific for these determinants. We found that antigenicity of a given GST—peptide combination was not the same when T cells and antigen presenting cells from different individuals were tested. Our results show that differences in processing and presentation of chimeric proteins are not dictated by the use of diverse restriction elements. We also found that the context in which an antigenic peptide is delivered affects the recruited repertoire as defined according to T cell receptor Vβ usage and fine specificities of selected T cells. 相似文献
93.
本文采用超凝胶柱层析法分离纯化日本血吸虫成虫31/32KD抗原。分离的抗原经银染色及免疫印迹法分析证明已达免疫纯及生化纯级。该抗原PAS染色呈阴性,经过碘酸钠处理后不失去活性,在琼脂糖凝胶电泳中趋向阳极。鉴于血吸虫成虫31/32KD组分是一种主要血清学抗原,它的分离纯化为改进和标化血吸虫病的诊断提供了条件。 相似文献
94.
Osamu Mori Minoru Miyasato Tadashi Karashima Takashi Hashimoto 《The Journal of dermatology》1998,25(8):497-502
Previous studies using primary monolayer cultures of epithelial cells from the involved epidermis of patients with mammary and extramammary Paget's disease investigated whether Paget cells proliferate as other malignant cells do. Although epithelial monolayers from the involved skin were maintained for approximately 45 days, no permanent cell lines were established. The proportion of carcinoembryonic antigen (CEA)-positive cells did not increase in the long-term cultures. Herein, we report studies of whether there is a real reduction of Paget cell numbers or if this is merely a decrease in the expression of CEA by the cells. Furthermore, we investigated whether Paget cells survive longer when cultured free from any potential inhibitory keratinocytes or other epidermal cells. Skin samples were obtained from one patient with mammary Paget's disease and three with extramammary Paget's disease; epidermal cells were cultured in vitro. An enrichment of Paget cells was carried out from the cultured epidermal cells by combining an anti-epithelial membrane antigen monoclonal antibody, binding to immunobeads, and density gradient centrifugation in Nycodenz. The separated cells were re-cultured in Keratinocyte-SFM serum-free media. The proportion of CEA-positive cells did not increase in the cultures, and the purified cells did not show any increase in survival times compared to the non-purified cultured cells. These results suggest that the decrease of CEA-positive cells noted during culture results from a decline in expression of CEA in the Paget cells. Paget cells in the involved epidermis do not proliferate significantly and thus differ from many other malignant cells. 相似文献
95.
为探讨仅表达非系限性分化抗原的急性白血病的细胞起源,采用单克隆抗体免疫酶标和聚合酶链反应技术分析了12例初诊时仅表达非系限性分化抗原的急性白血病化疗后免疫表型及免疫球蛋白重链(IgH)和T细胞受体(TCR)γ基因重排的变化。结果表明:初诊时仅表达CD38抗原的5例急性白血病,化疗后3例出现T细胞相关抗原表达,并伴TCRγ基因重排;5例初诊时仅表达HLA-DR或CD9的急性白血病,化疗后4例出现B细胞相关抗原表达,均伴有IgH基因重排;2例无任何抗原表达者,化疗后1例表达B细胞相关抗原,另1例表达骨髓细胞相关抗原。提示免疫标志的动态研究,有助于初诊时免疫学无法分类急性白血病细胞起源的确定。 相似文献
96.
Variation of prostate-specific antigen expression in different tumour growth patterns present in prostatectomy specimens 总被引:3,自引:0,他引:3
M. P. W. Gallee E. Visser-de Jong J. A. G. M. van der Korput Th. H. van der Kwast F. J. W. ten Kate F. H. Schroeder J. Trapman 《Urological research》1990,18(3):181-187
Summary A series of 55 randomly chosen radical prostatectomy specimens was analyzed for expression of prostate-specific antigen (PSA) by immunohistochemical techniques. Tissue sections were selected in such a manner that in addition to glandular benign prostatic hyperplasia (BPH), one or more different prostatic tumour growth patterns were present. Four monoclonal antibodies, directed against three different PSA epitopes, and one polyclonal anti-PSA antiserum were used. Expression of PSA was compared with that of prostate-specific acid phosphatase (PAP), recognized by two different polyclonal antisera. A critical dilution aimed at a maximum of staining intensity on BPH tissue sections was chosen for all antibodies. Anti-PSA and anti-PAP antisera stained essentially all BPH samples (over 90%). Irrespective of the nature of the antibodies used, PSA expression was found to be decreased in prostatic carcinoma. A clear cut relationship was found between immunoreactivity for PSA and the degree of differentiation of the tumour area. Under the experimental conditions used the PSA monoclonal antibodies stained only 1 out of 10 undifferentiated carcinomas, whereas 50% to 70% of the well- and moderately-differentiated carcinomas showed immunoreactivity. This correlation was less pronounced with the PAP staining pattern. If the PSA antibody titer was raised the percentage of clearly staining undifferentiated carcinomas could be considerably increased (up to 60%–100%), indicating that PSA expression is not absent, but lowered in most (if not all) undifferentiated carcinomas. 相似文献
97.
98.
单克隆抗体对溶组织内阿米巴吞噬红细胞的影响 总被引:1,自引:0,他引:1
用具有抗细胞膜活性和抗细胞核、胞浆活性的单克隆抗体3F7和4G6与致病性溶组织内阿米巴HM-1∶IMSS株滋养体37℃孵育,在孵育即刻、5min、10min加入红细胞,检测滋养体吞噬红细胞的能力,并以正常小鼠血清和抗克氏锥虫抗体TCE04作为对照。结果,经单克隆抗体3F7孵育即刻的HM-1∶IMSS虫株滋养体吞噬红细胞能力明显减弱(P<0.001),而4G6抑制滋养体吞噬红细胞的作用不如前者明显。提示,抗细胞膜单克隆抗体对抑制滋养体吞噬红细胞有显著作用,但随着时间的推移,抑制作用明显减弱。 相似文献
99.
癌变的早期诊断对提高疗效具有特殊意义,为了寻求简捷,高效,超前,可靠的诊断方法,实验以DMBA(二甲基苯并蒽)诱导的金地鼠颊囊致癌模型为对象,以PCNA(增殖细胞核抗原)BrdV(溴脱氧尿嘧啶)等免疫组化技术为手段;以光镜观察诊断为对照,对三种观察结果进行相关分析,发现三者间有高度显著的相关性,证实了免疫组化方法在癌变诊断中有一定的参考价值,实验还发现PCNA和BrdU检测结果比较每天敏感,简捷, 相似文献
100.
采用鼠抗PCNA单克隆抗体,ABC法,对11例正常口腔粘膜及29例口腔鳞癌进行了染色。结果表明:正常粘膜仅在基底层中有少量的PCNA阳性细胞,其阳性分级为1级。而鳞癌阳性分级主要是3~4级,随着组织学分级的升高,PCNA阳性表达率也相应增高。经统计学分析,正常组织与鳞癌之间及鳞癌各级均有非常显著差异(P<001)。提示:PCNA的表达与口腔鳞癌组织学分级有关。 相似文献