全文获取类型
收费全文 | 248479篇 |
免费 | 8417篇 |
国内免费 | 5647篇 |
专业分类
耳鼻咽喉 | 1690篇 |
儿科学 | 7386篇 |
妇产科学 | 3558篇 |
基础医学 | 23917篇 |
口腔科学 | 2744篇 |
临床医学 | 21621篇 |
内科学 | 40247篇 |
皮肤病学 | 1248篇 |
神经病学 | 19928篇 |
特种医学 | 11900篇 |
外国民族医学 | 40篇 |
外科学 | 36631篇 |
综合类 | 17934篇 |
现状与发展 | 14篇 |
一般理论 | 16篇 |
预防医学 | 23867篇 |
眼科学 | 4271篇 |
药学 | 17759篇 |
83篇 | |
中国医学 | 5703篇 |
肿瘤学 | 21986篇 |
出版年
2024年 | 237篇 |
2023年 | 987篇 |
2022年 | 2505篇 |
2021年 | 3479篇 |
2020年 | 2854篇 |
2019年 | 2232篇 |
2018年 | 24138篇 |
2017年 | 19577篇 |
2016年 | 21467篇 |
2015年 | 4384篇 |
2014年 | 5139篇 |
2013年 | 5085篇 |
2012年 | 13266篇 |
2011年 | 27956篇 |
2010年 | 23698篇 |
2009年 | 15636篇 |
2008年 | 24023篇 |
2007年 | 26193篇 |
2006年 | 4820篇 |
2005年 | 6046篇 |
2004年 | 6064篇 |
2003年 | 6715篇 |
2002年 | 4518篇 |
2001年 | 1887篇 |
2000年 | 1857篇 |
1999年 | 1316篇 |
1998年 | 969篇 |
1997年 | 944篇 |
1996年 | 666篇 |
1995年 | 616篇 |
1994年 | 480篇 |
1993年 | 345篇 |
1992年 | 275篇 |
1991年 | 276篇 |
1990年 | 309篇 |
1989年 | 256篇 |
1988年 | 187篇 |
1987年 | 158篇 |
1986年 | 117篇 |
1985年 | 123篇 |
1984年 | 67篇 |
1983年 | 53篇 |
1982年 | 52篇 |
1981年 | 24篇 |
1980年 | 54篇 |
1938年 | 60篇 |
1937年 | 25篇 |
1934年 | 30篇 |
1932年 | 59篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 781 毫秒
981.
982.
983.
Existing knowledge and present experience relating to the indications for imaging techniques in trauma surgery were summarised, screened and considered in different ways by representatives of various professional scientific bodies, with the aim of finding what procedures should be implemented as the primary examination techniques after a careful clinical examination when particular posttraumatic situations affecting the knee, foot, ankle, or hand were found. In the course of an interdisciplinary consensus conference the evidence-based recommendations prepared by a panel were discussed and modified, giving rise to statements on the suitability of the given imaging techniques in 28 different clinical situations immediately after a clinical examination, based on scientific evidence and medical consensus. The degree of consensus was measured and carefully documented. These statements were transformed into decision algorithms and presented to doctors working in accident and emergency medicine during a conference on trauma surgery, with the aim of.measuring the acceptance of the statements among those attending the trauma surgery meeting. The remarks made by the participants during the discussion and the results of the acceptance measurements clearly show the need for further discussion among experts. 相似文献
984.
985.
MMP-2、TIMP-2在脑胶质瘤中的表达及其意义 总被引:4,自引:0,他引:4
目的 分析MMP-2、TIMP-2的表达与脑胶质瘤恶性程度和侵袭性之间的关系。方法 采用免疫组化和原位杂交的方法,检测42例人脑胶质瘤和8例正常脑组织中,MMP-2 mRNA、MMP-2和TIMP-2蛋白表达。结果 MMP-2蛋白表达水平(LI)与肿瘤的分级呈正相关(r=0.872,P<0.01);Ⅲ、Ⅳ级与正常脑组织、Ⅰ~Ⅱ级之间均有显著的差异(P<0.01)。MMP-2mRNA表达与肿瘤的分级同样呈正相关(P<0.01);Ⅲ、Ⅳ级与正常脑组织、Ⅰ~Ⅱ级之间均有显著的差异(P<0.01)。MMP-2蛋白表达增高时TIMP-2蛋白表达也增高;但随着肿瘤恶性程度的增加,TIMP-2表达强度增加的幅度较MMP-2明显减缓。结论 MMP-2的高表达与脑胶质瘤恶性程度呈正相关;TIMP-2与MMP-2间的平衡失调与脑胶质瘤的侵袭性和恶性程度密切相关。 相似文献
986.
Erwin Wehking 《Trauma und Berufskrankheit》2004,6(3):S324-S326
Current activities in the case management of patients with post-traumatic stress disorders are reported. In 2002 a project was initiated by accident insurance associations. The aim is to detect accident victims with stress disorder at an early stage and to avoid medical mismanagement. 相似文献
987.
There is some controversy over the treatment of acromioclavicular injuries. The use of the Rockwood classification as the basis for decisions on whether operative or nonoperative treatment is indicated is discussed critically, and the authors' preferred operative technique is described and illustrated by examples. We treat injuries classified according to the Rockwood classification as types I and II with conservative methods. In type III injuries the patient's age, job and free time activities determine whether or not surgery is indicated. In the case of type IV or type VI injuries we always perform temporary internal fixation of the acromioclavicular joint, using transarticular K-wire fixation or hookplate osteosynthesis. Satisfactory results of both operative and nonoperative treatment are reported in the literature. The authors' own results are presented. 相似文献
988.
Schizophrenia is characterized by significant cognitive impairments that predict impairment in multiple domains of community
outcome. Pharmacologic and psychosocial treatments are available that address these cognitive deficits. There is growing evidence
that patients taking second-generation antipsychotic medications perform better on tests of cognitive function than those
taking conventional neuroleptics. In addition, there have been a number of medications from other classes being investigated
as cognitive enhancers for schizophrenia. Cognitive rehabilitation approaches focus on bypassing, compensating for, or remediating
observed impairments in cognitive function. Outcomes for patients have been improved by cognitive remediation, errorless learning,
and the use of supportive environments. Combining the newest pharmacologic interventions for cognitive dysfunction with state
of the art psychosocial treatments aimed at ameliorating or bypassing deficits is likely to produce the most favorable outcomes
for individuals with schizophrenia. 相似文献
989.
990.
目的 分离和纯化母婴血型不合母体的特异性高效价的IgG抗体。方法 采用半饱和硫酸铵低温沉淀法分离IgG抗体,SephedexA50层析柱纯化,然后用B型红细胞(RBC)吸收放散IgG,用聚乙二醇(PEG)沉淀,真空泵脱水回收IgO。结果 200ml血浆经半饱和硫酸铵低温沉淀后得IgG粗制品2.26g,Sephedex A50层析柱纯化后得纯制品1.84g,经B型RBC吸收放散后得特异性IgG 0.55g,回收率达29.89%(0.55/1.84)。结论 采用半饱和硫酸铵低温沉淀法分离高效价IgG抗体,可以获得高纯度的IgG。 相似文献