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   1344940篇
  免费   114912篇
  国内免费   6373篇
耳鼻咽喉   16807篇
儿科学   43168篇
妇产科学   37042篇
基础医学   185064篇
口腔科学   36455篇
临床医学   121052篇
内科学   280883篇
皮肤病学   32092篇
神经病学   111015篇
特种医学   55659篇
外国民族医学   274篇
外科学   211300篇
综合类   31546篇
现状与发展   2篇
一般理论   415篇
预防医学   107365篇
眼科学   28160篇
药学   94458篇
  5篇
中国医学   2281篇
肿瘤学   71182篇
  2018年   13439篇
  2017年   10672篇
  2016年   12839篇
  2015年   14361篇
  2014年   20007篇
  2013年   29828篇
  2012年   36921篇
  2011年   39824篇
  2010年   24617篇
  2009年   24041篇
  2008年   37013篇
  2007年   39542篇
  2006年   40706篇
  2005年   39261篇
  2004年   37599篇
  2003年   36583篇
  2002年   34623篇
  2001年   66497篇
  2000年   68544篇
  1999年   56981篇
  1998年   16752篇
  1997年   15030篇
  1996年   16018篇
  1995年   16241篇
  1994年   15110篇
  1993年   14158篇
  1992年   47110篇
  1991年   45757篇
  1990年   43979篇
  1989年   41825篇
  1988年   38768篇
  1987年   38090篇
  1986年   35866篇
  1985年   34644篇
  1984年   26365篇
  1983年   22110篇
  1982年   13848篇
  1981年   12449篇
  1980年   11720篇
  1979年   23547篇
  1978年   17074篇
  1977年   14385篇
  1976年   13183篇
  1975年   13724篇
  1974年   16100篇
  1973年   15398篇
  1972年   14176篇
  1971年   13040篇
  1970年   11884篇
  1969年   11101篇
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
921.
922.
923.
Physicians as gatekeepers. A complex challenge   总被引:1,自引:0,他引:1  
  相似文献   
924.
Interest in inguinal hernia surgery has increased significantly with the introduction of new operating techniques during the past decade. This multicenter study compared short-term results in patients treated by the laparoscopic transabdominal preperitoneal patch technique (TAPP; n=518) and the Shouldice technique (n=524). We evaluated demographics, operative data, complications, hospital stay, postoperative pain, use of analgesics, functional status, sick leave, and complaints up to 3 months postoperatively. The median operating time was shorter in the Shouldice group (55 vs. 65 min), but there were no significant differences in complication rates, and major complications were rare. The hospital stay was 1 day or less in over 98% of cases in both groups, but more operations were performed on outpatient basis in the Shouldice group. In the TAPP group postoperative pain and analgesic consumption were less, postoperative functional status was better, and sick leave was shorter (10 vs. 14 days). These results show that the two methods are equally safe and have few major complications. The TAPP operation is associated with less postoperative pain, better postoperative functional status, and shorter sick leave, but at the price of a longer operating time. Electronic Publication  相似文献   
925.
926.
927.
Salmus is a product of Salvia sclarea technology that is widely used in balneary practice. It is established that the analytical characteristics of salmus substance, as stipulated in the temporal pharmacopoeial article VFS 42-1530-85, are not objective and should not be used for evaluating the quality of the ready-to-use preparation and for monitoring the process of its manufacturing. TLC data show that salmus contains all components of sage oil (Russian State Standard GOST 3171-76) except for linalyl acetate. Qualitative specific color reactions on Silufol TLC plates showed for the first time the presence of flavonoids such as kaempferol, quercetin, juglanin, quercitrin, and rungioside and revealed one previously unknown substance, probably, of a flavonoid nature. The TLC data also showed the presence of condensed tannins and chlorophylls. It is suggested to perform quantitative analysis and identification of biologically active substances in salmus using methods for determining the content of reducing sugars (carbohydrates) and oxidizable components. New procedures for determining the sum of essential oils and flavonoids using the total content of extractable components have been developed and verified. It is suggested that these substances are among the main therapeutic components of salmus. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 39, No. 8, pp. 33 – 36, August, 2005.  相似文献   
928.
Tc-99m HMPAO was used to evaluate cerebral perfusion in a patient with tuberous sclerosis. The SPECT images demonstrated reduced HMPAO uptake in regions corresponding with MRI-confirmed locations of cortical tubers. These results indicate that the lesions are characterized by vascular perfusion deficits and support the hypothesis that cortical tubers result from developmental abnormalities of the embryonic central nervous system.  相似文献   
929.
Esophageal pH monitoring is the accepted standard for the investigation of gastroesophageal reflux (GER) in adults. A postal questionnaire was sent to 912 United Kingdom paediatric physicians & surgeons. Five hundred forty-seven (61%) replied, with 124 (22.7%) currently using the technique, mostly in conjunction with barium swallow and/or esophagoscopy. The use of pH monitoring to quantify GER was also accepted in principal as being the best determinant of reflux by a further 186 (34%), but as yet was unavailable in their hospitals. Pediatricians were also questioned as to their management of children with GER. The majority were treated medically with a variety of antireflux medication, with only 237 (42%) referring cases for surgery.  相似文献   
930.
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