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   5898篇
  免费   249篇
  国内免费   27篇
耳鼻咽喉   133篇
儿科学   231篇
妇产科学   260篇
基础医学   796篇
口腔科学   64篇
临床医学   433篇
内科学   1456篇
皮肤病学   75篇
神经病学   494篇
特种医学   75篇
外科学   392篇
综合类   37篇
一般理论   1篇
预防医学   468篇
眼科学   184篇
药学   667篇
中国医学   11篇
肿瘤学   397篇
  2024年   7篇
  2023年   46篇
  2022年   154篇
  2021年   240篇
  2020年   94篇
  2019年   120篇
  2018年   141篇
  2017年   136篇
  2016年   158篇
  2015年   155篇
  2014年   221篇
  2013年   268篇
  2012年   436篇
  2011年   478篇
  2010年   256篇
  2009年   204篇
  2008年   339篇
  2007年   425篇
  2006年   399篇
  2005年   391篇
  2004年   400篇
  2003年   367篇
  2002年   328篇
  2001年   22篇
  2000年   18篇
  1999年   20篇
  1998年   32篇
  1997年   31篇
  1996年   21篇
  1995年   25篇
  1994年   10篇
  1993年   8篇
  1992年   13篇
  1991年   12篇
  1990年   8篇
  1989年   12篇
  1988年   10篇
  1987年   10篇
  1986年   16篇
  1985年   14篇
  1984年   12篇
  1983年   15篇
  1982年   13篇
  1981年   13篇
  1980年   8篇
  1979年   9篇
  1977年   11篇
  1976年   6篇
  1975年   11篇
  1974年   8篇
排序方式: 共有6174条查询结果,搜索用时 15 毫秒
61.
Bruton's tyrosine kinase (BTK) is a central mediator of B-cell receptor (BCR) signaling essential for normal B-cell development. Ibrutinib is an oral BTK inhibitor that induces apoptosis and inhibits migration and adhesion of malignant B-cells. Updated results of this international, multicenter, phase 2 study of single agent ibrutinib in relapsed or refractory MCL will be presented.Ibrutinib 560 mg PO QD was administered continuously until disease progression. Tumor response was assessed every 2 cycles (one cycle = 28 days). The study enrolled 115 patients (65 bortezomib-naïve, 50 bortezomib-exposed); 111 patients were treated; 110 were evaluable for response. Baseline characteristics included: median age 68 years, time since diagnosis 42 months, number of prior treatments 3; bulky disease (>10 cm) 13%, prior stem cell transplant 10%, high risk MIPI 49%.Median time on treatment was 9.2 months; 53% of patients remain on therapy. Median PFS was 13.9 months and DOR has not yet been reached. Responses increased with longer treatment: comparing to previous data described at ASH 2011, the CR rate increased from 16% to 39%, and the ORR increased from 69% to 75%.  相似文献   
62.
63.
64.

Objective

To assess the prevalence of pain in the musculoskeletal system and possible reasons for these complaints among early age children from Warsaw schools.

Material and methods

The study was conducted in 34 randomly selected primary schools in Warsaw in 2011. 2748 survey-questionnaires were given to parents or legal guardians by children. Of these, 1509 surveys were subject to a final analysis. The survey included 66 questions regarding, among other things, pain in the musculoskeletal system in children. Additionally, there were questions about possibly occurring diseases, any postural defects, significant obesity, as well as effects of these complaints on the child''s physical activity. Survey data regarded 6–7-year-old children.

Results

In the group of 1509 respondents, 242 children (16%) complained about pain in the musculoskeletal system. Pain was located most frequently in the knee joints, and more rarely in the spine and joints in the upper extremities. In the group of children who complained about pain, moderate physical activity was statistically significantly limited. According to parents, physicians did not diagnose any medical conditions in 106 children. Joint disease was diagnosed in 33 children. Postural defects were diagnosed in 589 children. In 123 children complaining about pain at least one postural defect was diagnosed. Such defects were diagnosed statistically significantly more rarely (p = 0.011) in 1234 children who did not complain about pain (460 children). Platypodia or other foot deformation was observed in 25% of these children, spinal curvature in 12%, abnormal knee joint position in 11% and uneven hip position in 2% children. Of note, 17% of all children were significantly overweight. In overweight children the prevalence of pain, especially in the knee joints and feet, was significantly higher.

Conclusions

This study aims to underline the problem of musculoskeletal pain in early-age children which limits their physical activity. Also the authors draw attention to the issue of postural defects in a large group of school children. This issue undoubtedly requires more attention and a plan how to create more effective methods of prevention.  相似文献   
65.
66.
Endoscopy being a diagnostic tool, allows also a nonsurgical treatment of upper gastrointestinal tract neoplasms, even at their advanced stage. Argon plasma coagulation (APC) is a contact-free method of monopolar coagulation, based primarily on the effects of high frequency electrical current flow in the ionized argon. The study used in 14 patients, aged 56-85 years, with advanced carcinoma of oesophagus and/or cardia. Carcinoma was diagnosed upon the results of endoscopic and microscopic examinations. The following parameters were included in the analysis: electrical current power, number of treatment sessions, stage of dysphagia, oesophagus passage, localization and type of a tumor. The analysis revealed that APC is a highly effective as well as safe method of palliative treatment of advanced oesophageal and/or cardiac cancers. Moreover, it was noted that APC is more effective in adenocarcinomas than in squamous cell carcinomas.  相似文献   
67.
[Purpose] To assess the effect of 12-weeks Nordic walking training on gait parameters and some elements of postural control. [Subjects and Methods] Sixty-seven women aged 65 to 74 years were enrolled in this study. The subjects were divided into a Nordic Walking group (12 weeks of Nordic walking training, 3 times a week for 75 minutes) and a control group. In both study groups, a set of functional tests were conducted at the beginning and at the end of the study: the Forward Reach Test (FRT) and the Upward Reach Test (URT) on a stabilometric platform, and the analysis of gait parameters on a treadmill. [Results] The NW group showed improvements in: the range of reach in the FRT test and the URT test in compared to the control group. The length of the gait cycle and gait cycle frequency also showed changes in the NW group compared to the control group. [Conclusion] A 12-week NW training program had a positive impact on selected gait parameters and may improve the postural control of women aged over 65 according to the results selected functional tests.Key words: Nordic walking, Postural control, Gait  相似文献   
68.
The fibroblast growth factor 1 (FGF1) gene is expressed primarily in the kidney and may contribute to hypertension. However, the biologic mechanisms underlying the association between FGF1 and BP regulation remain unknown. We report that the major allele of FGF1 single nucleotide polymorphism rs152524 was associated in a dose-dependent manner with systolic BP (P=9.65×10−5) and diastolic BP (P=7.61×10−3) in a meta-analysis of 14,364 individuals and with renal expression of FGF1 mRNA in 126 human kidneys (P=9.0×10−3). Next-generation RNA sequencing revealed that upregulated renal expression of FGF1 or of each of the three FGF1 mRNA isoforms individually was associated with higher BP. FGF1-stratified coexpression analysis in two separate collections of human kidneys identified 126 FGF1 partner mRNAs, of which 71 and 63 showed at least nominal association with systolic and diastolic BP, respectively. Of those mRNAs, seven mRNAs in five genes (MME, PTPRO, REN, SLC12A3, and WNK1) had strong prior annotation to BP or hypertension. MME, which encodes an enzyme that degrades circulating natriuretic peptides, showed the strongest differential coexpression with FGF1 between hypertensive and normotensive kidneys. Furthermore, higher level of renal FGF1 expression was associated with lower circulating levels of atrial and brain natriuretic peptides. These findings indicate that FGF1 expression in the kidney is at least under partial genetic control and that renal expression of several FGF1 partner genes involved in the natriuretic peptide catabolism pathway, renin-angiotensin cascade, and sodium handling network may explain the association between FGF1 and BP.  相似文献   
69.
70.
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