全文获取类型
收费全文 | 1765113篇 |
免费 | 141405篇 |
国内免费 | 6728篇 |
专业分类
耳鼻咽喉 | 22763篇 |
儿科学 | 57266篇 |
妇产科学 | 47736篇 |
基础医学 | 254180篇 |
口腔科学 | 48911篇 |
临床医学 | 158798篇 |
内科学 | 353856篇 |
皮肤病学 | 41848篇 |
神经病学 | 140790篇 |
特种医学 | 70715篇 |
外国民族医学 | 330篇 |
外科学 | 273685篇 |
综合类 | 38621篇 |
现状与发展 | 2篇 |
一般理论 | 528篇 |
预防医学 | 140593篇 |
眼科学 | 38467篇 |
药学 | 127793篇 |
5篇 | |
中国医学 | 3092篇 |
肿瘤学 | 93267篇 |
出版年
2018年 | 17413篇 |
2016年 | 16131篇 |
2015年 | 17969篇 |
2014年 | 24983篇 |
2013年 | 37882篇 |
2012年 | 47092篇 |
2011年 | 51120篇 |
2010年 | 31452篇 |
2009年 | 30488篇 |
2008年 | 47961篇 |
2007年 | 51211篇 |
2006年 | 52405篇 |
2005年 | 50614篇 |
2004年 | 48601篇 |
2003年 | 47150篇 |
2002年 | 45172篇 |
2001年 | 84687篇 |
2000年 | 87383篇 |
1999年 | 72747篇 |
1998年 | 21186篇 |
1997年 | 18842篇 |
1996年 | 20015篇 |
1995年 | 19855篇 |
1994年 | 18470篇 |
1993年 | 17461篇 |
1992年 | 59626篇 |
1991年 | 58951篇 |
1990年 | 57219篇 |
1989年 | 54823篇 |
1988年 | 50625篇 |
1987年 | 49874篇 |
1986年 | 46995篇 |
1985年 | 45329篇 |
1984年 | 34342篇 |
1983年 | 29011篇 |
1982年 | 17629篇 |
1981年 | 15977篇 |
1980年 | 14980篇 |
1979年 | 31459篇 |
1978年 | 22858篇 |
1977年 | 19293篇 |
1976年 | 17982篇 |
1975年 | 19242篇 |
1974年 | 22726篇 |
1973年 | 21596篇 |
1972年 | 20330篇 |
1971年 | 18946篇 |
1970年 | 17367篇 |
1969年 | 16367篇 |
1968年 | 15286篇 |
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
991.
Biodistributions of 201Tl in tumor bearing animals and inflammatory lesion induced animals 总被引:1,自引:0,他引:1
A Ando I Ando M Katayama S Sanada T Hiraki H Mori N Tonami K Hisada 《European journal of nuclear medicine》1987,12(11):567-572
The accumulation of 201Tl in tumor and inflammatory tissues were small. However, this nuclide showed a high concentration in viable tumor tissue, less in connective tissue (containing inflammatory tissue), and was not seen in necrotic tumor tissue regardless of the time after administration of 201Tl(I)-chloride. In inflammatory lesions, 201Tl accumulated in subcutaneous tissue infiltrated with neutrophils and macrophages, and quite large amounts of this nuclide were accumulated in subcutaneous tissue and sites where neutrophils were crowded. Most 201Tl existed in a free form in the fluid of tumor and inflammatory tissues regardless of the time after administration. A small amount of this nuclide was localized in the nuclear, mitochondrial and microsomal fractions in these tissues, and the nuclide was bound to protein in these fractions. The distribution of 201Tl(III)-chloride in tumor bearing animals was essentially the same as that of 201Tl(I)-chloride. 相似文献
992.
993.
Biological fixation of porous-coated implants 总被引:1,自引:0,他引:1
R J Haddad S D Cook K A Thomas 《The Journal of bone and joint surgery. American volume》1987,69(9):1459-1466
994.
Single course versus maintenance bacillus Calmette-Guerin therapy for superficial bladder tumors: a prospective, randomized trial 总被引:1,自引:0,他引:1
M A Hudson T L Ratliff D P Gillen E O Haaff S M Dresner W J Catalona 《The Journal of urology》1987,138(2):295-298
A total of 42 patients with recurrent superficial bladder tumors or carcinoma in situ entered a prospective, randomized trial to compare the efficacy of bacillus Calmette-Guerin therapy with and without quarterly maintenance instillations of bacillus Calmette-Guerin. Maintenance therapy did not reduce further bladder tumor recurrence rates or the interval to recurrence in patients who responded to the initial course of therapy. However, prolongation of toxicity was observed with maintenance bacillus Calmette-Guerin therapy. 相似文献
995.
996.
We report two patients with severe hypoglycorrhachia after a subarachnoid hemorrhage. They had no obvious meningeal infection, and they spontaneously recovered within a few weeks. Such cases have previously been reported in neonates, but exceptionally in adults. Contrary to detailed cases from the literature, our patients recovered without antibiotics, and hypoglycorrhachia was very severe. 相似文献
997.
998.
Computed tomographic (CT) scans of the brain in a child with Smith-Lemli-Opitz syndrome revealed enlargement of the ventricular system, hypoplasia of the cerebellum, and abnormal thickening of the gray matter, consistent with pachygyria. These findings have been previously noted in autopsies performed on patients with this disorder. We conclude that CT scanning is a valuable tool in the evaluation of children suspected of having the Smith-Lemli-Opitz syndrome. 相似文献
999.
1000.