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   12227篇
  免费   908篇
  国内免费   511篇
耳鼻咽喉   34篇
儿科学   162篇
妇产科学   112篇
基础医学   469篇
口腔科学   103篇
临床医学   1786篇
内科学   1160篇
皮肤病学   100篇
神经病学   532篇
特种医学   725篇
外国民族医学   3篇
外科学   973篇
综合类   2696篇
现状与发展   1篇
一般理论   3篇
预防医学   536篇
眼科学   372篇
药学   1987篇
  34篇
中国医学   852篇
肿瘤学   1006篇
  2024年   46篇
  2023年   234篇
  2022年   280篇
  2021年   419篇
  2020年   471篇
  2019年   358篇
  2018年   358篇
  2017年   377篇
  2016年   455篇
  2015年   487篇
  2014年   651篇
  2013年   1004篇
  2012年   671篇
  2011年   709篇
  2010年   696篇
  2009年   507篇
  2008年   503篇
  2007年   657篇
  2006年   613篇
  2005年   577篇
  2004年   494篇
  2003年   406篇
  2002年   364篇
  2001年   395篇
  2000年   326篇
  1999年   251篇
  1998年   223篇
  1997年   156篇
  1996年   112篇
  1995年   95篇
  1994年   95篇
  1993年   101篇
  1992年   90篇
  1991年   127篇
  1990年   71篇
  1989年   44篇
  1988年   37篇
  1987年   17篇
  1986年   30篇
  1985年   20篇
  1984年   29篇
  1983年   15篇
  1982年   11篇
  1981年   13篇
  1980年   17篇
  1979年   14篇
  1978年   7篇
  1977年   3篇
  1976年   4篇
  1974年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
Women with metastatic breast cancer (MBC), a life-threatening illness, stand to benefit a great deal from online support groups, but none have been studied specifically within this population. The present mixed-method study was carried out to determine which therapeutic factors occurred in online MBC support groups, and to see how such factors might have acted to benefit participants. Participants were 20 women with MBC who participated in online peer support groups. Most reported benefiting in some way from their groups. Six therapeutic factors theorized to be helpful in online support groups and cancer support groups were present in the groups studied: group cohesiveness, information exchange, universality, instillation of hope, catharsis, and altruism. However, although participants reported being able to discuss many other concerns freely, they had difficulty discussing death and dying, which are critical issues for this category of women with BC.  相似文献   
73.
Introduction. Pain and its control have been studied extensively in the emergency department. Numerous studies indicate that inadequate treatment of pain is common, despite the availability of myriad analgesics. It has been suggested that oligoanesthesia is also a common practice in the prehospital setting. Objective. To assess the use of prehospital analgesia in patients with suspected extremity fracture. Methods. Emergency medical services (EMS) call reports were reviewed for all patients with suspected extremity fractures treated from June 1997 to July 1998 in a midwestern community with a population base of 223,000. Data collected included demographic information, mechanism of injury, medications given, and field treatment. Standing orders for administration of analgesia were available and permitted paramedics to give either morphine sulfate or nitrous oxide per protocol. Results. The EMS call reports were analyzed for 1,073 patients with suspected extremity fractures. The mean patient age was 47 years. Accidental injuries comprised 86.5% of those reviewed. Suspected leg fractures were most common (20%), followed by hips (18%), arms (11%), knees (10%), ankles (9%), shoulders (7.2%), hands (5.5%), and wrists (5.3%). Multiple trauma and assorted broken digits accounted for the remaining 14%. The most common mechanisms of injury were: fall (43%), motor vehicle collision (21%), and human assault (10%). Intravenous lines were placed in 9.4% of patients; 17% received ice packs; 16% received bandage/dressings; 25% received air splints; and 19% were fully immobilized. Analgesia was administered to 18 patients (1.8%): 16 patients received nitrous oxide and two received morphine. Conclusion. Administration of analgesics to prehospital patients with suspected fractures was rare. Prehospital identification and treatment of pain for patients with musculoskeletal trauma could be improved.  相似文献   
74.
75.
76.
77.
Abstract

Therapeutic ultrasound, an important physiotherapy modality, has been used successfully in the treatment of patients with chronic rhinosinusitis (CRS). No study has compared pulsed ultrasound (PUS) with erythromycin phonophoresis (EP). The aim of this randomized, double-blind, parallel group study with concealed allocation was to compare PUS with EP. Sixty CRS patients were randomly allocated into two groups. Group 1 had PUS and Group 2 had EP. Patients were treated 3 days a week for 10 sessions over 4 weeks. The severity of nine CRS symptoms was self-rated by patients on an ordinal scale of 0–3 (absent, mild, moderate or severe) at baseline and after the 10th treatment session. Individual symptom scores were summed to obtain a “Total Symptom Score” (TSS). The outcome measure included percentage improvement in the TSS. A statistically significant improvement in TSS occurred with both PUS and EP therapy groups (p?<?0.05). The percentage improvement in the EP group was statistically greater than in the PUS group (67.2 versus 49.3%) (p?=?0.03). The effect sizes in both therapy groups were large; PUS: d?=?1.36 and EP: d?=?2.15. EP was found to be superior over PUS therapy.  相似文献   
78.
Abstract

Objective: The purpose of our investigation was to evaluate the usefulness of cone-beam computed tomography (CBCT) in balloon-occluded retrograde transvenous obliteration (B-RTO) for gastric varices. Material and methods: Between December 2010 and March 2011, four patients underwent B-RTO for gastric varices that occurred after portal hypertension. In all, after insertion of sclerotic agents, CBCT was used to observe distribution of the sclerotic agent in the gastric varices and afferent gastric veins. Investigated was whether the entire gastric varices and afferent gastric veins were confirmed by retrograde venography performed when the sclerotic agent was infused and by CBCT obtained after insertion of the sclerotic agent. Results: On CBCT obtained after insertion of the sclerotic agent, distribution of sclerotic agents in the gastric varices and afferent gastric veins was clearly visualized. On the other hand, retrograde venography was inferior in detecting the area of distribution of sclerotic agents and the afferent gastric veins. Conclusion: Application of CBCT is helpful to precisely evaluate the distribution of sclerotic agents in B-RTO.  相似文献   
79.
Augmentation of adaptive immunity via HIV therapeutic vaccination may be a key component of curative strategies. Adoptive dendritic cell (DC) immunotherapies may prove useful in enhancing the success of these approaches by circumventing certain defects in DC function during HIV infection. Thus far, DC immunotherapies that utilize autologous, inactivated virus as an immunogen have provided the most promising results however, are beset with practical constraints. Consequently, alternative forms of immunogens are under investigation, with an emphasis on RNA-based approaches. Here we review the data from DC immunotherapy trials for HIV infection and discuss challenges and future directions in the field.  相似文献   
80.
The use of DNA plasmids for DNA vaccination was first described in the early 1990s. DNA vaccinations were successful in small animal models but in larger animals and humans problems appeared. One major obstacle, effective delivery, has been partly overcome by new delivery techniques, such as transdermal delivery with the gene gun, and in vivo electroporation. We are entering a new era of DNA vaccination, where such techniques can be tested in humans. DNA vaccination may be a useful therapy for chronic hepatitis C virus (HCV) infections. Patients with these infections have a reduced T cell response to the invading virus. The genetic variability of HCV, its immunomodulatory properties and high replication rate contribute to chronicity. By providing the correct stimulus T cells may be activated to clear the infection. The vaccination is intended to induce a coordinated immune-based attack on the continuously moving HCV target. If effective, this should help in clearing the infection.  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