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   5949篇
  免费   310篇
  国内免费   39篇
耳鼻咽喉   99篇
儿科学   165篇
妇产科学   137篇
基础医学   705篇
口腔科学   145篇
临床医学   569篇
内科学   1118篇
皮肤病学   99篇
神经病学   336篇
特种医学   143篇
外国民族医学   3篇
外科学   752篇
综合类   197篇
一般理论   5篇
预防医学   514篇
眼科学   229篇
药学   699篇
中国医学   67篇
肿瘤学   316篇
  2024年   12篇
  2023年   98篇
  2022年   330篇
  2021年   454篇
  2020年   216篇
  2019年   231篇
  2018年   285篇
  2017年   167篇
  2016年   200篇
  2015年   189篇
  2014年   237篇
  2013年   321篇
  2012年   406篇
  2011年   420篇
  2010年   216篇
  2009年   185篇
  2008年   259篇
  2007年   233篇
  2006年   234篇
  2005年   189篇
  2004年   212篇
  2003年   192篇
  2002年   181篇
  2001年   77篇
  2000年   70篇
  1999年   70篇
  1998年   39篇
  1997年   57篇
  1996年   27篇
  1995年   33篇
  1994年   23篇
  1993年   20篇
  1992年   48篇
  1991年   40篇
  1990年   35篇
  1989年   31篇
  1988年   37篇
  1987年   15篇
  1986年   13篇
  1985年   16篇
  1984年   10篇
  1982年   16篇
  1981年   10篇
  1980年   17篇
  1979年   11篇
  1978年   13篇
  1977年   14篇
  1976年   10篇
  1975年   11篇
  1974年   13篇
排序方式: 共有6298条查询结果,搜索用时 0 毫秒
41.
Shi YP  Jia ZJ  Ma B  Saleh S  Lahham J 《Planta medica》1996,62(3):260-262
From the whole plants of Euphorbia petiolata, four new ingenane-type diterpenoids, 3,20-O-diacetylingenol 5-O-(2' E,4' Z)-tetradecadienoate (1), 5,20-O-diacetylingenol 3- O-(2' E,4' Z)-tetradecadienoate (2), ingenol 3-O-(2' E,4' Z)-tetradecadienoate (3), and 5,20-O-isopropylidenylingenol 3-O-(2' E,4' Z)-tetradecadienoate (4) were isolated. Their structures were elucidated by spectroscopic methods and chemical transformations.  相似文献   
42.
With the Sequoia fixator, lengthenings can be achieved based on the clinical facts of the case. The device is a modular apparatus that can perform corrections in several planes, and, if necessary, in a septic environment. In our opinion, a "lengthener surgeon" is one who can foresee problems and take appropriate steps to prevent them. Likewise, the surgeon must act as the coordinator of an entire team. A successful lengthening is 5% surgery and 95% postoperative nursing and physiotherapy care. In the future, a number of changes will simplify postoperative management: 1. Composite carbon rings will make the frames radiolucent and one third lighter than those made of stainless steel. Automatic tensioners will help maintain steady tension on the wires. 2. Digital analysis of the callus will provide norms of consolidation, allowing faster fixator removal and conversion to an orthosis. 3. Incorporating the foot in the frame to overcome equinus will eliminate the need for tenotomy. We believe that monolateral and ring fixators can work together in certain locations. That is why we proposed, at the 18th Societé Internationale de Chirurgie Orthopédique et Traumatologique meeting, a combined monolateral-ring construct that can be used for lengthening throughout the proximal femoral metaphysis.  相似文献   
43.
44.
45.
46.
Objective The purpose of this study was to determine consumer attitudes towards community pharmacy and their preferences for the introduction of new services. Methods A self‐completion questionnaire was developed and 1,144 consumers in 55 community pharmacies were invited to complete it. The questionnaire covered consumers' choice of pharmacy; their perceptions of, and actual interactions with, community pharmacists; advice from pharmacists about general health and prescribed medicines; and privacy in the pharmacy. Respondents were asked for their views about five possible new services. Setting The study was based in community pharmacies in Riyadh City, Saudi Arabia. Key findings The response rate was 79.6%. Fifty‐nine per cent of respondents often or sometimes visited a particular pharmacy. One‐quarter of respondents perceived community pharmacists as having a good balance between health and business matters, while 56.1% thought pharmacists were more concerned with the business. The majority of respondents (69.7%) said they felt comfortable asking the pharmacist for advice. Just under half (44.8%) felt that pharmacists allowed them enough time to discuss their problem fully and listened well. In addition, 58.5% of respondents indicated that their pharmacists showed sensitivity to privacy by speaking more quietly across the counter. In 14.4% of situations pharmacists were reported to use a private area within the pharmacy when discussing personal or private matters. Most respondents (65.2%) indicated that their pharmacist was willing to discuss their health problems and tried to understand their feelings. Consumers' priorities for new services were: monitoring blood pressure; measuring weight, height and temperature; monitoring blood sugar; and monitoring cholesterol. Conclusion This study showed that most pharmacy customers feel comfortable seeking advice from their pharmacist. Although many pharmacists were reported to show sensitivity to a possible lack of privacy in the pharmacy, few respondents reported that their pharmacy had a private area for discussion. Customers' views on possible new services were generally positive, with the exception of patient medication records.  相似文献   
47.
48.
This is a prospective study evaluating 28 patients who were suspected to have ectopic pregnancy. Frozen section Pipelle endometrial biopsy was performed as an outpatient procedure to look for the presence of chorionic villi in the specimen. The sensitivity of the frozen section endometrial biopsy in detecting the presence of chorionic villi was 13.3% and the specificity was 100%. The positive predictive value was 100% and the negative predictive value was 50%. We concluded that frozen section endometrial biopsy was not helpful in predicting intrauterine gestational process; therefore, it has a limited application in patients suspected to have ectopic pregnancy.  相似文献   
49.
Sixty-seven residents of a rural Midwestern state were surveyed by telephone to determine which factors influence their willingness to receive mental health services through live, two-way audio and video transmission. Two-thirds of the survey respondents were willing to participate in telepsychiatry. Many expressed reluctance, however. They were concerned about maintaining confidentiality, and they perceived telepsychiatry as impersonal. Medicare enrollees and older survey respondents were less willing than younger respondents to endorse the use of telemedicine.  相似文献   
50.
PURPOSE: This multicenter, open-label, phase I/IIa study was undertaken to establish the safety/toxicity profile of cetuximab in combination with gemcitabine and carboplatin in patients with chemotherapy-na?ve, epidermal growth factor receptor-positive, stage IV non-small-cell lung cancer. Secondary objectives were to gather preliminary evidence of efficacy including tumor response rate, time to progression, and overall survival. PATIENTS AND METHODS: Thirty-five patients received a total of 264 3-week cycles of treatment with cetuximab, carboplatin, and gemcitabine. An initial dose of cetuximab 400 mg/m2 intravenously was administered the first week, followed by weekly doses of 250 mg/m2. Carboplatin (area under the curve = 5, day 1) and gemcitabine 1,000 mg/m2 on days 1 and 8 were administered every 3 weeks. Patients were evaluated for tumor response after every two cycles of therapy. RESULTS: The most frequently reported adverse events related to cetuximab included an acne-like rash (88.6%), dry skin (34.3%), asthenia and skin disorders (31.4%), mucositis/stomatitis (25.7%), fever/chills (20%), and nausea/vomiting (17.1%). The majority of these toxicities were mild to moderate. One patient withdrew from the study because of a grade 3 allergic reaction. Myelosuppression was the most frequently observed toxicity related to chemotherapy. Responses among 35 assessable patients included 10 partial responses (28.6%). Twenty-one patients had stable disease. The median time to progression was 165 days, and the median overall survival was 310 days. CONCLUSION: The combination of cetuximab, carboplatin, and gemcitabine was well tolerated with an acceptable toxicity profile. Most grade 3 adverse events were attributable to chemotherapy. The response rate and median survival are encouraging and warrant additional investigation.  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