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   1140455篇
  免费   72985篇
  国内免费   1768篇
耳鼻咽喉   14802篇
儿科学   37410篇
妇产科学   28760篇
基础医学   181713篇
口腔科学   30520篇
临床医学   102572篇
内科学   215089篇
皮肤病学   25737篇
神经病学   79429篇
特种医学   42222篇
外国民族医学   126篇
外科学   169565篇
综合类   21626篇
现状与发展   3篇
一般理论   251篇
预防医学   83229篇
眼科学   26410篇
药学   86689篇
  4篇
中国医学   3244篇
肿瘤学   65807篇
  2021年   8657篇
  2018年   12562篇
  2017年   9481篇
  2016年   10731篇
  2015年   11987篇
  2014年   16216篇
  2013年   24320篇
  2012年   33551篇
  2011年   35972篇
  2010年   21028篇
  2009年   19473篇
  2008年   33157篇
  2007年   36009篇
  2006年   35920篇
  2005年   33930篇
  2004年   33034篇
  2003年   31633篇
  2002年   30695篇
  2001年   54892篇
  2000年   55784篇
  1999年   46147篇
  1998年   12255篇
  1997年   10360篇
  1996年   10649篇
  1995年   10030篇
  1994年   9172篇
  1992年   34737篇
  1991年   35351篇
  1990年   34688篇
  1989年   34324篇
  1988年   31286篇
  1987年   30662篇
  1986年   28901篇
  1985年   27372篇
  1984年   20213篇
  1983年   17182篇
  1982年   9365篇
  1979年   18806篇
  1978年   13255篇
  1977年   10941篇
  1976年   10946篇
  1975年   12542篇
  1974年   14479篇
  1973年   13940篇
  1972年   13009篇
  1971年   12307篇
  1970年   11765篇
  1969年   10880篇
  1968年   10123篇
  1967年   9022篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
OBJECTIVE: This study was conducted to compare an otolaryngologist's experience with a cohort of epilepsy patients implanted with a vagal nerve stimulator (VNS) to previously published data. METHODS: Demographics, preoperative seizure frequency, medications, and complications were retrospectively collected from patients implanted by the senior author. Postoperative medications and seizure frequency were obtained from referring neurologists. RESULTS: Seventeen patients were implanted over a 24-month period. Average age was 28.3 years. Patients presented with petit mal (n = 3), tonic-clonic (n = 6), complex partial (n = 5), and grand mal (n = 8) seizures. Mean follow-up postimplantation was 13.5 months. Most patients had at least a 50% reduction of seizure frequency, with 3 patients being seizure free. There were no postoperative infections. One patient had left vocal cord immobility. The most common side effect was voice disturbance during device activation. CONCLUSION: Otolaryngologists are well equipped to perform VNS implantation and to diagnose and treat possible laryngeal side effects. EBM rating: C-4.  相似文献   
82.
A rapid procedure for determining angiotensin II in the blood by inverse voltammetry using a TA-2 device (Tekhnoanalit Company, Tomsk) with a graphite electrode has been developed. The results of analyses using the proposed technique agree with the clinical data. The rapid analytical procedure favors optimization of cardiotropic drug therapy. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 12, pp. 54–56, December, 2006.  相似文献   
83.
84.
85.
86.
In order to assess the state and pathology of the woman's pelvis minor, a number of methods are commonly used among practitioners, encompassing clinical exploration, radiology, MRN, urodynamics, endoscopy and echography.

Echography has been poorly used in clinical pelvic exploration and its reliability is actually a matter of controversy 1. However, echographic surveys can provide us with valuable gynecological data on the state and pathologies of the soft pelvis, within the genital regions or even going beyond them, i.e. the rectal channel, bladder, urethra, anus, vascular plexuses, and all of their supporting tissues.

At our research unit, we have been employing Transvaginal Ultrasound echography (TVU) for a long time in conjunction with other pelvis-focused methods in order to study different kinds of pelvic alterations. TVU has proven to be friendly to use, fast, harmless and inexpensive, allowing serial explorations and producing high-quality dynamic images (loop-cinema, video-tape). Furthermore, this method is fairly aseptic in that the occurrence of faeces in the rectal ampolla is not a nuisance but a bonus in tracking the contours of the rectum walls and other topographical features which would be otherwise difficult to survey.

A complete pelvic floor TVU may add no longer than 5-8 minutes to a routine gynecological examination, can be implemented by the general gynecologist and generates data that can be further studied by the appropriate specialist for a more insightful evaluation 2.  相似文献   
87.
88.
BACKGROUND: Arterial hypertension and postmenopausal reduction of estrogen levels may be involved in modifications of the stiffness of large arteries. OBJECTIVES: To evaluate the pulse-wave velocity (PWV) and indirectly the arterial stiffness in hypertensive postmenopausal women submitted to hormone therapy with estradiol alone or combined with norethisterone acetate. SUBJECTS: Forty-five hypertensive postmenopausal women were double-blindly, randomly assigned to three arms of treatment: placebo (group I); estradiol 2 mg/day (group II); or estradiol 2 mg/day and norethisterone acetate 1 mg/day (group III). METHODS: Arterial stiffness was assessed from PWV measurements of the common carotid and femoral arteries (CF-PWV) and the common carotid and radial arteries (CR-PWV) obtained using the automatic Complior(R) device, taken at baseline and after 12 weeks of treatment. RESULTS: After the 12-week treatment, values of CF-PWV and CR-PWV were not significantly different (p = 0.910 and p = 0.736, respectively) among the groups. Systolic blood pressure showed a positive correlation with CF-PWV in groups II and III (p = 0.02 and p < 0.001, respectively). CONCLUSIONS: PWV and arterial stiffness in postmenopausal hypertensive women did not reduce over a 12-week treatment with estradiol alone compared with the same period of treatment with estradiol combined with norethisterone acetate.  相似文献   
89.
90.
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