全文获取类型
收费全文 | 1325篇 |
免费 | 120篇 |
国内免费 | 40篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 72篇 |
妇产科学 | 25篇 |
基础医学 | 206篇 |
口腔科学 | 23篇 |
临床医学 | 181篇 |
内科学 | 254篇 |
皮肤病学 | 6篇 |
神经病学 | 55篇 |
特种医学 | 204篇 |
外科学 | 136篇 |
综合类 | 41篇 |
预防医学 | 135篇 |
眼科学 | 20篇 |
药学 | 82篇 |
中国医学 | 1篇 |
肿瘤学 | 40篇 |
出版年
2023年 | 6篇 |
2022年 | 8篇 |
2021年 | 15篇 |
2019年 | 10篇 |
2018年 | 20篇 |
2017年 | 21篇 |
2016年 | 20篇 |
2015年 | 18篇 |
2014年 | 33篇 |
2013年 | 41篇 |
2012年 | 50篇 |
2011年 | 43篇 |
2010年 | 29篇 |
2009年 | 53篇 |
2008年 | 36篇 |
2007年 | 66篇 |
2006年 | 47篇 |
2005年 | 34篇 |
2004年 | 37篇 |
2003年 | 42篇 |
2002年 | 43篇 |
2001年 | 27篇 |
2000年 | 26篇 |
1999年 | 33篇 |
1998年 | 57篇 |
1997年 | 56篇 |
1996年 | 47篇 |
1995年 | 36篇 |
1994年 | 27篇 |
1993年 | 43篇 |
1992年 | 20篇 |
1991年 | 28篇 |
1990年 | 30篇 |
1989年 | 39篇 |
1988年 | 45篇 |
1987年 | 40篇 |
1986年 | 31篇 |
1985年 | 31篇 |
1984年 | 21篇 |
1983年 | 22篇 |
1982年 | 21篇 |
1981年 | 21篇 |
1980年 | 20篇 |
1979年 | 16篇 |
1978年 | 13篇 |
1977年 | 13篇 |
1976年 | 9篇 |
1975年 | 9篇 |
1974年 | 6篇 |
1930年 | 5篇 |
排序方式: 共有1485条查询结果,搜索用时 203 毫秒
81.
Imray CH Mead MK Thacker AJ Dimitri WR 《British journal of anaesthesia》2002,88(2):303-4; author reply 303-4
82.
Joseph L Demer Maria Carolina Ortube Elizabeth C Engle Neepa Thacker 《Journal of AAPOS》2006,10(2):135-142
INTRODUCTION: Although the ocular motility examination has been used traditionally in the diagnosis of strabismus that is a result of cranial nerve (CN) abnormalities, magnetic resonance imaging (MRI) now permits the direct imaging of lesions in CN palsies. METHODS: Prospectively, nerves to extraocular muscles (EOMs) were imaged with T1 weighting in orbits of 83 orthotropic volunteers and 96 strabismic patients in quasicoronal planes using surface coils. Intraorbital resolution was 234-312 microns within 1.5- to 2.0-mm thick planes. CNs were imaged at the brainstem using head coils and T2 weighting, yielding 195 micron resolution in planes 1.0-mm thick in 6 normal volunteers and 22 patients who had oculomotor (CN3), trochlear (CN4), or abducens (CN6) palsies and Duane syndrome. RESULTS: Oculomotor (CN3) and abducens (CN6) but not trochlear (CN4) nerves were demonstrable in the orbit and skull base in all normal subjects. Patients with congenital CN3 palsies had hypoplastic CN3s both in orbit and skull base, with hypoplasia of involved EOMs. Patients with chronic CN6 and CN4 palsies exhibited atrophy of involved EOMs. Patients with Duane syndrome exhibited absence or hypoplasia of CN6 in both orbit and brainstem regions, often with mild hypoplasia and apparent misdirection of CN3 to the lateral rectus muscle. Unlike CN6 palsy, patients with Duane syndrome exhibited no EOM hypoplasia. Patients with congenital fibrosis exhibited severe hypoplasia of CN3, moderate hypoplasia of CN6, and EOM hypoplasia, particularly severe for the superior rectus and levator muscles. CONCLUSION: High-resolution MRI can directly demonstrate pathology of CN3 and CN6 and affected EOM atrophy in strabismus caused by CN palsies. Direct imaging of CNs and EOMs by MRI is feasible and useful in differential diagnosis of complex strabismus. 相似文献
83.
84.
85.
Wooden foreign bodies in soft tissue: detection at US 总被引:4,自引:0,他引:4
86.
87.
The transgenic CHO cell line PL61, carrying a recombinant SV40-gpt gene, was treated with restriction endonucleases to assess mutagenesis from defined DNA double-strand breaks. Mutations ingpt were measured under two conditions: a stringent condition where selection ensured that the closely-linkedneo gene was retained functionally intact, or a relaxed condition without the requirement forneo gene function. Despite testing 18 different restriction endonucleases with various numbers of potential break-sites within
the transgene, mutations were only found under relaxed selection conditions. These mutations commonly led to complete loss
of the transgene, suggesting that large deletions predominate when selection is relaxed. It is argued, in comparison to mutation
data for other genomic sites in CHO cells, that variations in the ‘effective target size’ for mutagenesis may explain the
response of the transgene under different conditions. 相似文献
88.
J G Thacker G Rodeheaver L Kurtz M T Edgerton R F Edich 《American journal of surgery》1977,133(6):713-715
In this study, we have compared the recommended configuration of a knot with specified sutures as ascertained by mechanical performance tests to that employed by a group of board-certified surgeons. Agreement between the surgeon and the results of the test was encountered in only one fourth of the instances. In another one fourth of the cases the surgeon overestimated the number of throws required for a knot to reach knot break. This additional suture material further handicaps the host's defenses, thereby inviting infection. Surgeons employed knots that untied without reaching knot break in the remaining half of the cases. The holding power of many of the knots that untied was substantially less than that of knots reaching knot break. On the basis of the study, it is recommended that results of the mechanical performance tests be made readily available to the surgeon so that his patient can receive maximal benefits from the knotted suture with the least damage to the host's defenses. 相似文献
89.
Stephen B. Thacker M. D. Carolee Osborne Eva J. Salber M.D. D.P.H. 《Journal of community health》1978,3(4):347-356
We combine two standard approaches to analyze power and influence in health policy formulation within a moderately large county in the south. Intrinsic methodologic weaknesses are discussed and several conclusions are drawn regarding power in the health care sector of that community. The most significant finding is the shift in power over time, away from the individuals to committees and health care organizations. The ignorance of most physicians about the broader health care issues that affect the community was reflected in their lack of recognition by others in the community as influential decision makers. The insular relationship of the university to the rest of the community was also noted. Past racial politics had a continuing effect on later health policy formulation. These findings are discussed in light of current and past issues. Because we had promised confidentiality to the persons we interviewed, fictitious names were given to the county, the institutions, and the interviewees. 相似文献
90.
Emphysema in the renal allograft 总被引:1,自引:0,他引:1
Two diabetic patients in whom emphysematous pyelonephritis developed after renal transplantation are described. Clinical recognition of this unusual and serious infection is masked by the effects of immunosuppression. Abdominal radiographic, ultrasound, and computed tomography findings are discussed. The clinical presentation includes urinary tract infection, sepsis, and acute tubular malfunction of the allograft in insulin-dependent diabetics. 相似文献