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   1702175篇
  免费   127395篇
  国内免费   4589篇
耳鼻咽喉   21839篇
儿科学   55689篇
妇产科学   46267篇
基础医学   242398篇
口腔科学   48859篇
临床医学   152491篇
内科学   334974篇
皮肤病学   38732篇
神经病学   131717篇
特种医学   64202篇
外国民族医学   248篇
外科学   258234篇
综合类   40703篇
现状与发展   4篇
一般理论   531篇
预防医学   124788篇
眼科学   40460篇
药学   124659篇
  17篇
中国医学   5058篇
肿瘤学   102289篇
  2021年   13331篇
  2019年   13866篇
  2018年   20320篇
  2017年   15510篇
  2016年   16944篇
  2015年   19455篇
  2014年   26795篇
  2013年   38418篇
  2012年   53453篇
  2011年   56272篇
  2010年   33245篇
  2009年   31061篇
  2008年   52112篇
  2007年   55271篇
  2006年   55719篇
  2005年   53089篇
  2004年   51090篇
  2003年   48530篇
  2002年   46675篇
  2001年   92025篇
  2000年   93851篇
  1999年   77203篇
  1998年   19901篇
  1997年   17432篇
  1996年   17534篇
  1995年   16867篇
  1994年   15388篇
  1993年   14131篇
  1992年   57451篇
  1991年   55357篇
  1990年   53045篇
  1989年   50808篇
  1988年   46181篇
  1987年   44990篇
  1986年   42257篇
  1985年   40020篇
  1984年   29360篇
  1983年   24912篇
  1982年   13902篇
  1979年   25533篇
  1978年   17575篇
  1977年   14906篇
  1976年   13874篇
  1975年   14563篇
  1974年   17630篇
  1973年   16944篇
  1972年   15673篇
  1971年   14453篇
  1970年   13431篇
  1969年   12517篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
992.
Sub-trigonal phenol injection ensures a satisfactory response in about 50% of patients with detrusor instability. When oral anticholinergic treatment is poorly tolerated or ineffective, this minimally invasive technique has been found, in our series of 11 patients, to be a useful adjunct, at least temporarily.  相似文献   
993.
994.
995.
K Nagai  T Suda  K Kawasaki  S Mathuura 《Surgery》1986,100(5):815-821
In rats treat-given hydrocortisone to suppress healing, tensile strength of the skin at the site of an incision wound was significantly higher in rats locally treated with carnosine than in untreated animals. Similar effects on the tensile strength of the skin were observed by the administration of beta-alanine and histidine, but not of beta-alanine alone. Exogenous carnosine was degraded in the body by carnosinase and histidine decarboxylase to yield histamine. Since beta-alanine, the other degradation product of carnosine, was found to stimulate the biosynthesis of nucleic acids and collagen, histamine derived from carnosine is considered to have enhanced the process of wound healing by stimulating effusion at the initial stage of inflammation. Thus, the enhancement by carnosine of wound healing may be ascribed to stimulation of early effusion by histamine and of collagen biosynthesis by beta-alanine. The wound-healing effects of carnosine were further demonstrated by the observation that carnosine significantly increased granulation suppressed by cortisone, mitomycin C, 5-fluorouracil, and bleomycin.  相似文献   
996.
997.
In this study, the lamination pattern of the main olfactory bulb (MOB) of P. hispanica has been described using EM and Golgi-impregnation techniques. Six layers could be distinguished from the external surface to the ventricles: olfactory nerve layer (ONL), glomerular layer (GL), external plexiform layer (EPL), mitral layer (ML), internal plexiform layer (IPL), and granular cell layer (GCL). In ONL unmyelinated axonic bundles from the olfactory mucosa are seen. The GL is defined by the presence of terminal ramifications of the mitral primary dendrites and by axonic terminals of the olfactory nerve. The EPL is a dendritic articulation layer between the mitral and granule cells, where a great density of dendrodendritic synaptic contacts has been found. The ML is defined by the large mitral cell somata, and the IPL by myelinated axonic bundles that run rostro-caudally. Finally, the GCL is characterized by the presence of granule cells. Using the Golgi-impregnation method, five different neuronal types have been described. In the glomerular layer, a small cell population is located; these neurons seem the periglomerular cells described in mammals. The second type corresponds to the mitral cell population and the morphological features of these cells resemble to those of mammals. The three remaining types constitute the granule cell population; this population is characterized by a great morphological heterogeneousness. However, these types have been differentiated according to their dendritic tree morphology and location of the cell body. A morphological gradient depending on the distance of cell body for each type to the ependymal layer, has been observed. In EM, four different types of neuronal cell bodies according to their location and ultrastructure have been defined. The laminar organization of the MOB of Podarcis is similar to that in all vertebrates. The results for the fine structure and dendritic tree morphology have revealed a high similarity between these reptiles and mammals.  相似文献   
998.
999.
1000.
MK-0787 (Imipenem)/MK-0791 (Cilastatin sodium), a new compound of Thienamycin, was administered in treatment of 35 patients (36 cases) with chronic complicated UTI or for prevention of serious infections with much complicated factors. The patients were principally treated at a daily dose of 1 g for over 10 days. The efficacy rate of 26 patients who were evaluable in the early phase (4-7 days) was 88.5%, while it became up to 92.3% in the final phase judgment. As for clinical usefulness, the result was obtained to be as high as that of the clinical efficacy. In bacteriological study, 35 strains were clinically isolated including 7 strains of P. aeruginosa from UTI. All the strains disappeared with an eradication rate of 100% after treatment. Strains appearing after Imipenem/Cilastatin sodium treatment mainly consisted of fungi. Usefulness judgements tended to be greater in the final phase than in the early phase. As for side effects, vomiting was recorded in one case, in which the administration was discontinued. In laboratory findings there were 3 cases with elevated GPT, 2 cases with elevated GOT, one case with elevated gamma-GTP, one with thrombocytopenia, and one with eosinophilia each, but these abnormal values were slight and transient. In summary our clinical study showed that Imipenem/Cilastatin sodium was a very effective antibiotic in treatment on moderate or serious UTI or preventive use for infections in compromised hosts. Considering the features of this agent, it might be more effective and useful for clinical use in treatment on polymicrobial infections including stubborn organisms than any other antimicrobial compounds. Furthermore, it was safe and well tolerable in a long term treatment.  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