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   1197篇
  免费   60篇
  国内免费   4篇
耳鼻咽喉   8篇
儿科学   12篇
妇产科学   10篇
基础医学   159篇
口腔科学   11篇
临床医学   89篇
内科学   185篇
皮肤病学   14篇
神经病学   84篇
特种医学   108篇
外科学   240篇
综合类   126篇
预防医学   60篇
眼科学   21篇
药学   71篇
中国医学   1篇
肿瘤学   62篇
  2022年   5篇
  2021年   6篇
  2019年   8篇
  2018年   7篇
  2017年   5篇
  2016年   7篇
  2015年   17篇
  2014年   26篇
  2013年   28篇
  2012年   36篇
  2011年   36篇
  2010年   30篇
  2009年   28篇
  2008年   61篇
  2007年   55篇
  2006年   66篇
  2005年   64篇
  2004年   65篇
  2003年   55篇
  2002年   45篇
  2001年   47篇
  2000年   41篇
  1999年   39篇
  1998年   32篇
  1997年   35篇
  1996年   29篇
  1995年   10篇
  1994年   19篇
  1993年   15篇
  1992年   21篇
  1991年   21篇
  1990年   20篇
  1989年   14篇
  1988年   30篇
  1987年   22篇
  1986年   19篇
  1985年   27篇
  1984年   19篇
  1983年   15篇
  1982年   12篇
  1981年   13篇
  1980年   10篇
  1979年   11篇
  1978年   14篇
  1977年   7篇
  1976年   7篇
  1975年   6篇
  1973年   5篇
  1971年   5篇
  1968年   4篇
排序方式: 共有1261条查询结果,搜索用时 15 毫秒
21.
A rare case of viral encephalitis in an 18 year old recruit who presented with signs of catatonic schizophrenia is reported.KEY WORDS: Viral encephalitis, Catatonic schizophrenia  相似文献   
22.
In Germany 1-2 of every thousand newborns suffer from severe hearing impairment. The fatal consequences of this irreversible condition are avoidable only if therapy is started as early as possible--according to current US-American recommendations before the age of 6 months. In Germany children even with severe hearing loss are identified only when they are 21 months old (average figure). Universal hearing screening before the age of 3 months could be a useful measure to reduce the mean age of children at the time of diagnosis and so to give them a chance of an early and promising therapy. In the USA this has been recommended by the National Institute of Health since 1993.  相似文献   
23.
Over a follow-up period of 6 years, 4 out of 31 live related renal allograft recipients (12.9%) developed azathioprine induced bone marrow suppression. Presentation in 3 patients was with fever and 2 patients also had associated graft dysfunction. All patients had leucopenia, 2 patients in addition had anaemia and one patient had pancytopenia. Bone marrow suppression developed 9.6 months (3.5-16.0 months) following transplantation and recovery followed over a period of 30 (18-49 days) days after withdrawal of the drug. One patient succumbed during the phase of bicytopenia.KEY WORDS: Azathioprine, Bone marrow suppression, Kidney transplantation  相似文献   
24.
Of the 253 neonates admitted to a neonate intensive care unit during the period Jan 91 to Sep 93, 43 neonates died. Autopsy was done in 23 of these (53%). The mean duration of stay of the neonates in the intensive care unit prior to death was 5.6 days (range 2 hours to 10 days). Antemortem diagnoses included asphyxia neonatorum (4), meconium aspiration syndrome (2), septicemia (5), prematurity (3), birth trauma (2), congenital anomalies (2), hypoxic ischemic encephalopathy (1), and non-specific diagnosis (4). There were 6 major autopsy findings that, if known prior to death, would have altered clinical management and might have resulted in cure or prolonged survival. There were 8 additional major findings that, if known prior to death, would not have altered management There were 14 minor findings related to major diagnoses but unrelated to the primary cause of death.KEY WORDS: Autopsy, Cause of death, Perinatal mortality  相似文献   
25.
Financing national health insurance is a topic that has been discussed for a long time in the United States. It is also of relevance for less developed countries, in particular in the Far East where some countries have just introduced or are on the brink of introducing national health insurance. Furthermore, there is an urgent need to consult those former socialist countries wishing to introduce a national health insurance system. The paper deals with basic principles of health insurance and specific elements of a (compulsory) social health insurance in detail.  相似文献   
26.
Interest in the knowledge of salivary gland tumours is highlighted. A sample of 315 cases, collected over a period of 25 years in a busy pathology centre, is analysed both on total and individual aspects of tumours. The findings are compared to earlier works on the subject and also with contemporary literature.KEY WORDS: Pathological study, Salivary tumours  相似文献   
27.
In a German paternity test, an alleged father was excluded only by reverse homozygosity of ORM1 phenotypes (mother ORM1 S, child ORM1 S and alleged father ORM1 F1) out of the 28 classical and DNA markers investigated. Without the ORM1 system the biostatistical probability of paternity was calculated to exceed 99.9999%. The intensity of the immunoprinted bands of the ORM1 protein for the child and alleged father after isoelectric focusing appeared to be reduced to about half. To identify a possible null allele, gene-specific amplification followed by single-strand conformation polymorphism and sequencing analyses were carried out. Deletion of one of the two copies of a 4 bp direct repeat sequence (GTCT) in exon 4 of the consensus sequence of ORM1*F1 was observed in the child and alleged father. Thus, the sharing of a rare mutant gene, ORM1*Q0köln, increased the probability of paternity.  相似文献   
28.
29.
Background  Cancer patients undergoing major abdominal or pelvic surgery are at considerable risk of venous thromboembolism (VTE). The genesis of thromboses in malignancy is complicated, and reflects the interaction and derangement of multiple molecular pathways. Furthermore, the nature and location of the cancer, as well as the type surgery involved, are thought to affect the level of VTE risk. These considerations may therefore affect treatment decisions. Methods  We performed multiple Medline searches with terms including but not limited to VTE, cancer, surgery, abdominal, colorectal, unfractionated heparin (UFH), and low-molecular-weight heparin (LMWH) to identify reviews, meta-analyses, nonrandomized and randomized controlled trials, and clinical guidelines relating to management of VTE in patients with abdominal cancer. Results  VTE incidence in patients with malignancy varied according to cancer type, location, stage of progression, and the use of catheters and/or chemotherapy. Thromboprophylaxis with UFH or LMWH reduces the risk of developing VTE in these patients. However, LMWHs have a favorable risk-benefit profile over UFH and extending the duration prophylaxis may improve outcomes. Conclusion  A number of recommendations can be made for the prevention of VTE in patients undergoing abdominal or pelvic surgery for cancer: (1) risk-stratify all patients according to defined evidence-based guidelines; (2) for most abdominal surgical oncology patients at risk, use of both an anticoagulant and mechanical means are indicated and beneficial; and (3) consider extended-duration prophylaxis (up to 28 days) in those patients with major abdominal/pelvic operations and impaired mobility, preferably with LMWH.  相似文献   
30.
Slezak  SE; Horan  PK 《Blood》1989,74(6):2172-2177
We report a new technology for in vivo tracking of hematopoietic cells, using fluorescent lipophilic probes. Because the probe is irreversibly bound in the lipids of the cell membrane; substantial numbers of dye molecules can be incorporated per cell and thus substantial signal to noise can be achieved. Although this technology can be used for all hematopoietic cells, these first findings are reported on red blood cells (RBCs) owing to the importance of the membrane to RBC function and integrity. We demonstrated that labeling 10% of the RBCs of a rabbit and reinjecting them into the animal makes possible the tracking of these cells at various times after injection. Furthermore, the labeling appears not to affect in vivo cell lifetime or cellular volume changes in response to hypotonic shock. The single cell fluorescence intensity of the labeled RBCs remains relatively constant for 60 days, and an immune response appears not to be generated against labeled cells. That labeled RBCs have lifetime kinetics in vivo, as shown in other studies, indicates that the membranes are functioning normally and are unaltered by the labeling technology. The technology we present is also applicable to white blood cells, bone marrow, and platelets.  相似文献   
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