全文获取类型
收费全文 | 1213篇 |
免费 | 178篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 95篇 |
妇产科学 | 17篇 |
基础医学 | 121篇 |
口腔科学 | 42篇 |
临床医学 | 162篇 |
内科学 | 294篇 |
皮肤病学 | 10篇 |
神经病学 | 63篇 |
特种医学 | 176篇 |
外科学 | 197篇 |
综合类 | 37篇 |
预防医学 | 66篇 |
眼科学 | 1篇 |
药学 | 32篇 |
中国医学 | 5篇 |
肿瘤学 | 66篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 21篇 |
2020年 | 10篇 |
2019年 | 8篇 |
2018年 | 40篇 |
2017年 | 50篇 |
2016年 | 46篇 |
2015年 | 44篇 |
2014年 | 48篇 |
2013年 | 72篇 |
2012年 | 52篇 |
2011年 | 34篇 |
2010年 | 77篇 |
2009年 | 64篇 |
2008年 | 43篇 |
2007年 | 39篇 |
2006年 | 32篇 |
2005年 | 23篇 |
2004年 | 20篇 |
2003年 | 24篇 |
2002年 | 20篇 |
2001年 | 29篇 |
2000年 | 19篇 |
1999年 | 15篇 |
1998年 | 65篇 |
1997年 | 59篇 |
1996年 | 57篇 |
1995年 | 52篇 |
1994年 | 28篇 |
1993年 | 41篇 |
1992年 | 18篇 |
1991年 | 22篇 |
1990年 | 22篇 |
1989年 | 19篇 |
1988年 | 27篇 |
1987年 | 23篇 |
1986年 | 18篇 |
1985年 | 10篇 |
1984年 | 13篇 |
1983年 | 17篇 |
1982年 | 4篇 |
1981年 | 18篇 |
1980年 | 9篇 |
1978年 | 3篇 |
1977年 | 11篇 |
1976年 | 12篇 |
1975年 | 3篇 |
1971年 | 3篇 |
1969年 | 2篇 |
排序方式: 共有1403条查询结果,搜索用时 21 毫秒
991.
In select patients, direct excisions of nasolabial folds and secondary malar festoons may be appropriate. On occasion, direct browlifting procedures may be indicated. We have analyzed our experience with 23 patients who had direct surgical excisions of skin as ancillary procedures for facial rejuvenation. Standardized photographic techniques were used. In all cases, the desired surgical effect was achieved. In two patients who had a direct browlift, scarring was felt to be quite visible. We conclude that in a select group of patients, these procedures provide predictably beneficial results. 相似文献
992.
Dr L. Flicker R. Green B. Kaymakci M. Lichtenstein G. Buirski J. D. Wark 《Osteoporosis international》1995,5(1):63-65
The interpretation of bone mineral densitometry results for a particular individual relies on valid reference data from a representative population sample. To establish local reference data, 411 Australian female volunteers had bone mineral densitometry performed at a single medical centre at the proximal femur and lumbar spine using a Hologic QDR 1000-W dual-energy X-ray absorptiometer. These data were compared with reference material from North American women compiled by Hologic. The Australian volunteers had, on average, 7% greater bone mineral density at the lumbar spine for the age range 25–55 years. Possible explanations for this include an actual population difference or the presence of a differential selection bias between the two samples. 相似文献
993.
It has been postulated that trifluoroacetyl chloride, a halothane metabolite, can bind covalently with the phosphatidylethanolamine component of the hepatic cell membrane and cause cell necrosis. Breakdown of the necrotic hepatocyte would release N-trifluoroacetyl-ethanolamine (TFAE) into the serum with subsequent urinary excretion. An original High Performance Liquid Chromatography (HPLC) method for the measurement of TFAE is described. In six children 1% halothane was administered for one hour and the halothane uptake measured. Urinary excretion of TFAE was measured for up to eight days and found to be 0.09 +/- 0.07% or less of the absorbed halothane. In children TFAE is not a major urinary metabolite of halothane. 相似文献
994.
H. Wark E.M. Wallace S. Wigg C. Tippett 《The Australian & New Zealand journal of obstetrics & gynaecology》1998,38(2):221-223
Summary: Eating disorders and the associated behavioural problems and drug abuse are uncommon in pregnancy. When they do occur they are often unrecognized because of denial but when significant may pose a risk to both the mother and her fetus. This case illustrates a number of problems that may be encountered in women with eating disorders in pregnancy, including prolonged and recurrent metabolic disturbances and diuretic abuse. In particular it illustrates the derangements of thyroid function seen in pregnant women with eating disorders and reminds us that when a cause for thyrotoxicosis remains obscure, thyroxine abuse should be considered and explored. 相似文献
995.
Bolus-chase MR digital subtraction angiography in the lower extremity 总被引:11,自引:0,他引:11
Wang Y; Lee HM; Khilnani NM; Trost DW; Jagust MB; Winchester PA; Bush HL; Sos TA; Sostman HD 《Radiology》1998,207(1):263
996.
997.
998.
The human T-cell leukemia/lymphoma virus associated with American adult T-cell leukemia/lymphoma 总被引:4,自引:1,他引:3
Blayney DW; Jaffe ES; Blattner WA; Cossman J; Robert-Guroff M; Longo DL; Bunn PA Jr; Gallo RC 《Blood》1983,62(2):401-405
The human T-cell leukemia/lymphoma virus (HTLV) is a novel type-C retrovirus isolated from patients with T-lymphoproliferative malignancies. Thirteen cases of HTLV-associated malignancy from US centers were studied in detail. Ten of these cases share common clinical features and define a typical virus-associated adult T-cell leukemia/lymphoma (ATL). All ten patients presented with Ann Arbor stage IV lymphoma because of skin involvement, bone marrow involvement, or lymphomatous leptomeningitis. Lymphadenopathy occurred in 7 of 10 patients at presentation, and the malignant cells were cytologically pleomorphic. Leukemia occurred in 60% of the patients at presentation. Hypercalcemia was found initially in two-thirds of the patients, with lytic bone lesions or positive bone scans in 7 of 10. Complete remission occurred in 40%, but all have relapsed. These cases closely resemble those virus-positive cases of adult T-cell leukemia/lymphoma (ATL) reported from Japan and the Caribbean. Three additional virus- positive patients had atypical presentations and diagnoses (acute lymphocytic leukemia, Sezary's syndrome, leukemic reticuloendotheliosis), usually with less aggressive clinical courses and atypical demographic and laboratory features. Presence of HTLV serum antibodies in cases of ATL (with hypercalcemia and circulating malignant cells) appears to define a distinct clinicopathologic entity that may occur in geographic clusters. 相似文献
999.
1000.