全文获取类型
收费全文 | 2656609篇 |
免费 | 204372篇 |
国内免费 | 4294篇 |
专业分类
耳鼻咽喉 | 38005篇 |
儿科学 | 89478篇 |
妇产科学 | 74535篇 |
基础医学 | 377143篇 |
口腔科学 | 77920篇 |
临床医学 | 232730篇 |
内科学 | 524175篇 |
皮肤病学 | 58288篇 |
神经病学 | 213103篇 |
特种医学 | 104028篇 |
外国民族医学 | 1066篇 |
外科学 | 400460篇 |
综合类 | 60569篇 |
现状与发展 | 4篇 |
一般理论 | 899篇 |
预防医学 | 207674篇 |
眼科学 | 60996篇 |
药学 | 199006篇 |
5篇 | |
中国医学 | 5293篇 |
肿瘤学 | 139898篇 |
出版年
2018年 | 29157篇 |
2017年 | 21722篇 |
2016年 | 23706篇 |
2015年 | 27077篇 |
2014年 | 37102篇 |
2013年 | 56483篇 |
2012年 | 78434篇 |
2011年 | 83039篇 |
2010年 | 48627篇 |
2009年 | 45320篇 |
2008年 | 77907篇 |
2007年 | 82596篇 |
2006年 | 82859篇 |
2005年 | 80705篇 |
2004年 | 78361篇 |
2003年 | 75071篇 |
2002年 | 73348篇 |
2001年 | 121820篇 |
2000年 | 126622篇 |
1999年 | 107257篇 |
1998年 | 29422篇 |
1997年 | 26527篇 |
1996年 | 26784篇 |
1995年 | 25839篇 |
1994年 | 24331篇 |
1993年 | 22781篇 |
1992年 | 86766篇 |
1991年 | 84588篇 |
1990年 | 82702篇 |
1989年 | 79254篇 |
1988年 | 73480篇 |
1987年 | 72401篇 |
1986年 | 68304篇 |
1985年 | 65835篇 |
1984年 | 49327篇 |
1983年 | 42263篇 |
1982年 | 24775篇 |
1981年 | 22296篇 |
1979年 | 46239篇 |
1978年 | 32251篇 |
1977年 | 27193篇 |
1976年 | 25601篇 |
1975年 | 27371篇 |
1974年 | 32947篇 |
1973年 | 31784篇 |
1972年 | 29204篇 |
1971年 | 27115篇 |
1970年 | 25208篇 |
1969年 | 23426篇 |
1968年 | 21416篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
The cell-free medium of isolated human glomeruli exhibited a procoagulant activity and stimulated thromboxane (TXB2) synthesis in human platelets in a dose-dependent manner. The amount of TXB2 measured was 16-fold higher than what could have been predicted (TXB2 synthesized by the platelets under control conditions plus TXB2 present in the glomerular supernatant). The lipid extract of the glomerular supernatant and its purified fraction including the fatty acids was still able to stimulate--although at a lesser degree--TXB2 synthesis in platelets. Stimulation was abolished after treatment of this fraction by charcoal or albumin. Gas chromatography/mass spectrometry analysis demonstrated the presence in the purified glomerular fraction of several long-chain saturated or monoenoic fatty acids at a total concentration of 80 microM with the following order of abundance: stearic, palmitic, myristic and oleic acids. Addition to human platelets of these same exogenous synthetic acids resulted in a dose-dependent stimulation of TX synthesis. It was maximum with three or four fatty acids tested in combination, but still present with myristic acid used separately. Arachidonic acid was absent in the glomerular supernatant. Thus the stimulation observed could not be related to a greater availability of substrate. Fatty acids did not act on platelets through a non-specific detergent effect since addition of high doses of detergents inhibited TXB2 formation in platelets. The combination of fatty acids from glomerular origin identified in the present study represents a novel factor involved in the control of intracapillary hemostasis, but different from the procoagulant activity common to many tissues.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
993.
A general overview of the literature concerning the development of diabetic neuropathic arthropathy is discussed. A case report is presented dealing with spontaneous fractures of the lesser metatarsal in a patient with an amputated hallux and peripheral neuropathy secondary to diabetes mellitus. 相似文献
994.
995.
996.
997.
S. Ahmed A. L. Sparnon J. P. Savage H. A. Boucaut A. J. Smith 《ANZ journal of surgery》1986,56(9):675-680
One hundred and one children over 1 year of age have had surgery for pelviureteric obstruction over an 11 year period. The common clinical features were abdominal pain, urinary infection or haematuria, but number presented as an incidental finding. Less commonly, the patients presented with an abdominal mass or with hypertension. The diagnosis was usually made on intravenous pyelography (IVP) but in the latter part of the series, renal nuclide scan (RNS) and ultrasonography (US) were preferred. Ninety–three patients had unilateral pyeloplasty, three had bilateral pyeloplasty and five had nephrectomy or heminephrectomy. Whereas initially nephrostomy drainage was used in the majority of patients after pyeloplasty, trend away from nephrostomy evolved in the latter part of the series. With experience, the incidence of postoperative complications was also reduced and there was reduction in the period of hospitalization. Clinical results were consistently satisfactory. Postoperative assessment after pyeloplasty was made by IVP and/or RNS and also US. A review of these investigations showed that RNS provided more factual information of the result when compared with the IVP. 相似文献
998.
999.
Platelet activation: role of an ADP receptor 总被引:3,自引:0,他引:3
R W Colman 《Seminars in hematology》1986,23(2):119-128
1000.
Ovarian and omental ependymomas in peritoneal washings: cytologic and immunocytochemical features 总被引:1,自引:0,他引:1
The cytologic findings in peritoneal washings of two women, one of whom had an ovarian ependymoma and the other a primary omental ependymoma, are reported. The ependymomas were characterized by the presence of numerous, isolated, spindle and stellate cells as well as groups of cells forming true rosettes. The tumor cells displayed slightly pleomorphic, round-to-oval eccentric nuclei and abundant fibrillary cytoplasm with tapering cytoplasmic processes. In addition, one of the patients had numerous papillae and cell clusters with associated psammoma bodies indistinguishable from those found in low-grade serous carcinoma. The demonstration of glial fibrillary acidic protein (GFAP) in both cases by immunocytochemical procedures indicates the usefulness of this method in cytologic preparations to confirm the diagnosis of these uncommon neoplasms. 相似文献