首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8951篇
  免费   578篇
  国内免费   64篇
耳鼻咽喉   100篇
儿科学   246篇
妇产科学   324篇
基础医学   1003篇
口腔科学   359篇
临床医学   764篇
内科学   1808篇
皮肤病学   215篇
神经病学   428篇
特种医学   304篇
外国民族医学   5篇
外科学   1552篇
综合类   173篇
现状与发展   2篇
一般理论   5篇
预防医学   518篇
眼科学   250篇
药学   958篇
中国医学   61篇
肿瘤学   518篇
  2023年   109篇
  2022年   335篇
  2021年   487篇
  2020年   328篇
  2019年   428篇
  2018年   525篇
  2017年   324篇
  2016年   347篇
  2015年   330篇
  2014年   394篇
  2013年   537篇
  2012年   705篇
  2011年   679篇
  2010年   399篇
  2009年   290篇
  2008年   442篇
  2007年   394篇
  2006年   370篇
  2005年   390篇
  2004年   325篇
  2003年   289篇
  2002年   241篇
  2001年   79篇
  2000年   46篇
  1999年   65篇
  1998年   57篇
  1997年   37篇
  1996年   40篇
  1995年   30篇
  1994年   25篇
  1993年   27篇
  1992年   36篇
  1991年   40篇
  1990年   31篇
  1989年   31篇
  1988年   26篇
  1987年   32篇
  1986年   24篇
  1985年   38篇
  1984年   29篇
  1983年   26篇
  1982年   19篇
  1981年   20篇
  1980年   19篇
  1979年   22篇
  1978年   11篇
  1977年   12篇
  1976年   21篇
  1975年   14篇
  1972年   13篇
排序方式: 共有9593条查询结果,搜索用时 15 毫秒
101.
102.
Hepatocellular carcinoma (HCC), represents more than 85% of liver cancers. The diagnosis of HCC may be delayed due to the absence of early, sensitive and specific biomarkers. This study was conducted to investigate whether the expression of thioredoxin (Trx) and glutaredoxin (Grx) is helpful for HCC diagnosis in an experimental model. Twenty male albino rats were equally divided into two groups (HCC and control). Hepatocarcinogenesis was performed by single intraperitoneal (i.p) injection of 200?mg/kg of diethylnitrosamine (DENA). Two weeks later, 0.05% of phenobarbital (PB) was supplied in the drinking water for other 14 weeks. HCC was diagnosed by measuring serum alpha-fetoprotein (AFP) level and histopathological examination. Our results found that hepatic indices alanine transaminase (ALT), aspartate transaminase (AST), total bilirubin were elevated but decreased total protein level. Lipid peroxidation was elevated through increasing hepatic content of MDA with decreased antioxidant parameters like hepatic SOD, CAT activities and GSH. The current study also found that Trx and Grx tissue genes were overexpressed in HCC group significantly, compared to control group. This study substantiated that increased expression of these enzymes may be predictive of outcomes in HCC.  相似文献   
103.
Aims: The aim of this study was to explore the family members' determinant of the delay in seeking psychiatric care to patients diagnosed with psychosis. Methods: Qualitative semi-structured interviews were carried out with twenty-seven family members of patients with psychosis at psychiatric outpatient clinics in Amman, Jordan. Results: The findings revealed that perceived stigma and fears about being labelled are the main barriers to requesting early psychiatric health care. The participants cited many different reasons linked to finding help led to delay in seeking help in the early stages of the illness including misattribution of the cause and symptoms of mental illness, family and financial factors. Conclusions: The study highlights the importance of enhancing knowledge about the schizophrenia-related spectrum to ensure patients seek treatment in a more timely manner.  相似文献   
104.
105.
Detailed assessment of the tricuspid valve using two‐dimensional echocardiography is always challenging, as only two of three leaflets can be seen at a time. Three‐dimensional echocardiography can provide the enface view of the tricuspid valve that allows simultaneous visualization of all of the three leaflets. In a 42‐year‐old male patient scheduled for pulmonary endarterectomy, 3DTEE showed that the tricuspid valve is bileaflet, with one septal and another lateral leaflet. There were two commissures, one of them is anteriorly positioned and the other one is posterior. Our findings were confirmed intra‐operatively by direct surgical visualization of the tricuspid valve.  相似文献   
106.
107.
Alopecia areata (AA) is a recurrent, immune‐mediated, hair‐loss disorder. It is associated with other autoimmune disorders that carry a high risk of cardiovascular disease (CVD). However, there is a lack of reports on the association of cardiovascular comorbidities and AA. Cardiac troponin I is a biomarker of myocardial ischaemia and inflammation, while N‐terminal pro‐B‐type natriuretic peptide is used in the diagnosis of congestive heart failure. This study was conducted to assess the serum level of both markers by ELISA in 44 patients with AA compared with 44 healthy controls (HCs). None of the participants had CVD, CVD risk factors or other diseases associated with elevation of either marker. The study revealed that serum levels of both markers were significantly higher in patients with AA compared with HCs (P < 0.001). The inflammatory milieu encountered in AA may be associated with subtle myocardial inflammation that causes elevation of levels of both of these cardiac markers.  相似文献   
108.
ObjectiveWe conducted a systematic review and dose–response meta-analysis of prospective studies to summarize findings on the associations between intakes of soy, soy isoflavones, and soy protein and risk of mortality from all causes, cancers, and cardiovascular diseases.MethodsOnline databases were systematically searched to identify relevant articles published earlier than May 2018. We applied restricted cubic splines using random-effects analysis to assess dose–response associations. Between-study heterogeneity was assessed by I2 value and Cochrane Q test. Potential publication bias was assessed by visual inspection of funnel plots and Begg regression test.ResultsIn total, 23 prospective studies with an overall sample size of 330,826 participants were included in the current systematic review and the meta-analysis. Soy/soy products consumption was inversely associated with deaths from cancers (pooled relative risk 0.88, 95% CI 0.79 to 0.99; P=0.03; I2=47.1%, 95% CI 0.0% to 75.4%) and cardiovascular diseases (pooled effect size: 0.85, 95% CI 0.72 to 0.99; P=0.04; I2=50.0%, 95% CI 0.0% to 77.6%). Such significant associations were also observed for all-cause mortality in some subgroups of the included studies, particularly those with higher quality. In addition, higher intake of soy was associated with decreased risk of mortality from gastric, colorectal, and lung cancers as well as ischemic cardiovascular diseases. Participants in the highest category of dietary soy isoflavones intake had a 10% lower risk of all-cause mortality compared with those in the lowest category. We also found that a 10-mg/day increase in intake of soy isoflavones was associated with 7% and 9% decreased risk of mortality from all cancers and also breast cancer respectively. Furthermore, a 12% reduction in breast cancer death was indicated for each 5-g/day increase in consumption of soy protein. However, intake of soy protein was not significantly associated with all-cause and cardiovascular diseases mortality.ConclusionsSoy and its isoflavones may favorably influence risk of mortality. In addition, soy protein intake was associated with a decreased risk in the mortality of breast cancer. Our findings may support the current recommendations to increase intake of soy for greater longevity.  相似文献   
109.
110.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号