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   240474篇
  免费   5827篇
  国内免费   172篇
耳鼻咽喉   1960篇
儿科学   8393篇
妇产科学   4672篇
基础医学   27058篇
口腔科学   3307篇
临床医学   19006篇
内科学   43577篇
皮肤病学   1696篇
神经病学   22521篇
特种医学   11639篇
外国民族医学   46篇
外科学   37086篇
综合类   2863篇
一般理论   88篇
预防医学   23562篇
眼科学   3954篇
药学   14082篇
中国医学   787篇
肿瘤学   20176篇
  2022年   402篇
  2021年   1068篇
  2020年   706篇
  2019年   979篇
  2018年   22969篇
  2017年   18080篇
  2016年   20343篇
  2015年   2017篇
  2014年   2212篇
  2013年   3244篇
  2012年   10005篇
  2011年   24052篇
  2010年   20982篇
  2009年   13382篇
  2008年   22240篇
  2007年   24548篇
  2006年   3559篇
  2005年   5036篇
  2004年   6304篇
  2003年   6985篇
  2002年   5234篇
  2001年   2454篇
  2000年   2633篇
  1999年   2190篇
  1998年   1127篇
  1997年   985篇
  1996年   797篇
  1995年   831篇
  1994年   733篇
  1993年   720篇
  1992年   1534篇
  1991年   1536篇
  1990年   1499篇
  1989年   1436篇
  1988年   1186篇
  1987年   1173篇
  1986年   1093篇
  1985年   1024篇
  1984年   751篇
  1983年   700篇
  1982年   508篇
  1981年   462篇
  1980年   440篇
  1979年   646篇
  1978年   412篇
  1977年   387篇
  1975年   397篇
  1974年   448篇
  1973年   362篇
  1972年   364篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.

Introduction  

This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning.  相似文献   
102.
Capello  E.  Vuolo  L.  Gualandi  F.  Van Lint  M. T.  Roccatagliata  L.  Bonzano  L.  Pardini  M.  Uccelli  A.  Mancardi  Gianluigi 《Neurological sciences》2009,30(2):175-175
Autologous haematopoietic stem-cell transplantation has been evaluated over the last years as a possible new therapeutic strategy in severe forms of multiple sclerosis unresponsive to the approved therapies. Up to now, more than 400 patients have been treated and numerous are the phase I and phase II studies which addressed the feasibility of this treatment, the efficacy, side effects and transplant-related mortality. The clinical response is strongly related to the intensity of the conditioning regimen utilized as well as to the phase of the disease course in which the therapy is carried out. Rapidly evolving multiple sclerosis with a relapsing–remitting clinical course and MRI signs of activity are the cases that can take more advantage. The risk of mortality, which dropped in the last years to 2–3%, is still the main problem of this powerful therapy.  相似文献   
103.
104.
105.

Introduction  

Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies.  相似文献   
106.
107.
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography (PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant potential of esophageal submucosal tumors.  相似文献   
108.
109.
Some investigators have suggested that preoperative chemotherapy for hepatic colorectal metastases may cause hepatic injury and increase perioperative morbidity and mortality. The objective of the current study was to examine whether treatment with preoperative chemotherapy was associated with hepatic injury of the nontumorous liver and whether such injury, if present, was associated with increased morbidity or mortality after hepatic resection. Two-hundred and twelve eligible patients who underwent hepatic resection for colorectal liver metastases between January 1999 and December 2005 were identified. Data on demographics, clinicopathologic characteristics, and preoperative chemotherapy details were collected and analyzed. The majority of patients received preoperative chemotherapy (n = 153; 72.2%). Chemotherapy consisted of fluoropyrimidine-based regimens: 5-FU monotherapy, 31.6%; irinotecan, 25.9%; and oxaliplatin, 14.6%. Among those patients who received chemotherapy, the type of chemotherapy regimen predicted distinct patterns of liver injury. Oxaliplatin was associated with increased likelihood of grade 3 sinusoidal dilatation (p = 0.017). Steatosis >30% was associated with irinotecan (27.3%) compared with no chemotherapy, 5-FU monotherapy, and oxaliplatin (all p < 0.05). Irinotecan also was associated with steatohepatitis, as two of the three patients with steatohepatitis had received irinotecan preoperatively. Overall, the perioperative complication rate was similar between the no-chemotherapy group (30.5%) and the chemotherapy group (35.3%) (p = 0.79). Preoperative chemotherapy was also not associated with 60-day mortality. In patients with hepatic colorectal metastases, preoperative chemotherapy is associated with hepatic injury in about 20 to 30% of patients. Furthermore, the type of hepatic injury after preoperative chemotherapy was regimen-specific. Presented at the American Hepato-Pancreato-Biliary Association 2006 Annual Meeting, March 11, Miami, Florida.  相似文献   
110.
The objective of this systematic review was to evaluate the impact of pharmacist delivered community-based services to optimise the use of medications for mental illness. Twenty-two controlled (randomised and non-randomised) studies of pharmacists' interventions in community and residential aged care settings identified in international scientific literature were included for review. Papers were assessed for study design, service recipient, country of origin, intervention type, number of participating pharmacists, methodological quality and outcome measurement. Three studies showed that pharmacists' medication counselling and treatment monitoring can improve adherence to antidepressant medications among those commencing treatment when calculated using an intention-to-treat analysis. Four trials demonstrated that pharmacist conducted medication reviews may reduce the number of potentially inappropriate medications prescribed to those at high risk of medication misadventure. The results of this review provide some evidence that pharmacists can contribute to optimising the use of medications for mental illness in the community setting. However, more well designed studies are needed to assess the impact of pharmacists as members of community mental health teams and as providers of comprehensive medicines information to people with schizophrenia and bipolar disorder  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