全文获取类型
收费全文 | 873篇 |
免费 | 36篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 19篇 |
妇产科学 | 19篇 |
基础医学 | 85篇 |
口腔科学 | 13篇 |
临床医学 | 76篇 |
内科学 | 202篇 |
皮肤病学 | 9篇 |
神经病学 | 35篇 |
特种医学 | 238篇 |
外科学 | 80篇 |
综合类 | 17篇 |
预防医学 | 38篇 |
眼科学 | 4篇 |
药学 | 38篇 |
中国医学 | 3篇 |
肿瘤学 | 43篇 |
出版年
2021年 | 7篇 |
2020年 | 8篇 |
2019年 | 5篇 |
2018年 | 7篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 14篇 |
2014年 | 15篇 |
2013年 | 21篇 |
2012年 | 15篇 |
2011年 | 20篇 |
2010年 | 28篇 |
2009年 | 33篇 |
2008年 | 27篇 |
2007年 | 24篇 |
2006年 | 38篇 |
2005年 | 34篇 |
2004年 | 26篇 |
2003年 | 36篇 |
2002年 | 31篇 |
2001年 | 33篇 |
2000年 | 31篇 |
1999年 | 38篇 |
1998年 | 39篇 |
1997年 | 34篇 |
1996年 | 34篇 |
1995年 | 20篇 |
1994年 | 16篇 |
1993年 | 12篇 |
1992年 | 21篇 |
1991年 | 14篇 |
1990年 | 12篇 |
1989年 | 23篇 |
1988年 | 28篇 |
1987年 | 11篇 |
1986年 | 17篇 |
1985年 | 22篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 9篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 9篇 |
1975年 | 8篇 |
1973年 | 4篇 |
1970年 | 8篇 |
1965年 | 3篇 |
排序方式: 共有922条查询结果,搜索用时 234 毫秒
1.
Occurrence of the t(2;5)(p23;q35) in non-Hodgkin's lymphoma 总被引:9,自引:3,他引:6
Weisenburger DD; Gordon BG; Vose JM; Bast MA; Chan WC; Greiner TC; Anderson JR; Sanger WG 《Blood》1996,87(9):3860-3868
Primary CD30(Ki-1)-positive anaplastic large-cell lymphoma (ALCL) is considered by some to be a distinct clinicopathologic entity associated with the t(2;5) (p23;q35). However, the specificity of t(2;5) for ALCL has not been carefully studied. Therefore, we performed a detailed analysis of all cases of ALCL with abnormal cytogenetics results in the Nebraska Lymphoma Study Group registry, as well as all other cases of non-Hodgkin's lymphoma with t(2;5) in the registry. We found the t(2;5) in only five of 10 cases of ALCL, four of whom were young patients. However, we also found the t(2;5) in 11 other cases of nonanaplastic lymphoma, including eight children with typical peripheral T-cell lymphomas of various types. The t(2;5) was also found in three older adults with B-cell lymphomas of various types. Thus, the t(2;5) was not specific for CD30+ ALCL. However, t(2;5) may define a clinicopathologic entity in children and young adults characterized by variable morphologies with a T-cell or indeterminate phenotype, CD30-positivity, nodal disease with frequent extranodal involvement, advanced stage, and an excellent response to therapy, including bone marrow transplantation for relapsed disease. The clinical relevance of the t(2;5) in older patients requires further study. 相似文献
2.
3.
4.
Two fast magnetic resonance (MR) imaging techniques, advanced Fourier and partial-flip imaging, were used at 0.35 T to examine 21 patients with suspected intracranial lesions; the results were quantitatively compared with a conventional spin-echo study. Both of the fast MR techniques yielded a fourfold reduction in imaging time per section. The advanced Fourier sequence showed contrast that was identical to the conventional spin-echo study with signal-to-noise ratios of 58% and 57% for the first and second echoes, respectively. The partial-flip sequence showed a contrast of 109% and 57% for lesions versus substantia alba, and 107% and 78% for substantia grisea versus substantia alba relative to the first and second echoes of the conventional spin-echo study. The partial-flip sequence was particularly sensitive to magnetic susceptibility; this produced artifacts that may undermine the usefulness of partial flip for routine screening in certain parts of the brain. However, this susceptibility significantly improved the detection of intracranial hemorrhage when compared with the spin-echo sequence, particularly when combined with phase mapping of the partial-flip study. 相似文献
5.
The non-invasive diagnostic assessment of thoracic lesions has been greatly enhanced by the use of positron emission tomography with metabolic active radio-compounds such as fluor-18 labeled deoxyglucose. Four clinical fields of use were established: differential diagnostic evaluation of lesions (T-staging); classification of adenopathy (N-staging); therapy response monitoring; diagnostic evaluation of recurrence. The upcoming challenges for clinical use are limited availability and necessary technical and qualitative standardizations. 相似文献
6.
7.
Hemorrhage secondary to anticoagulant therapy is well documented. We report a patient who presented with acute vertigo and unilateral deafness while on warfarin and was found to have a probable hemorrhage in the labyrinth, identified on MRI. 相似文献
8.
9.
10.
F. Glaser W. Knopp Prof. Dr. G. Muhr 《Archives of orthopaedic and trauma surgery》1988,107(4):253-255
Summary Postoperative hematoma formation must be treated as a potential infection. One fourth of all postoperative hematomas are already contaminated. Ultrasonographical examination is an effective method for early recognition of such postoperative hematomas. Ultrasonic diagnosis on a routine basis is not necessary, but it should be carried out as soon as clinical symptoms appear. Our postoperative late results with only one early and one late infection after 100 postoperative treatments of the hip joint and femoral shaft emphasize the importance of early diagnosis of hematomas.
Zusammenfassung Die drohende Infektion im postoperativen Verlauf nach Osteosynthesen bereitet diagnostische Probleme, da keine objektiven Kriterien vorhanden sind. Das postoperative Hämatom ist als eine drohende Infektion zu beurteilen. 1/4 aller postoperativen Hämatome sind bereits kontaminiert. Die Ultraschalluntersuchung ist eine wirksame diagnostische Hilfe zur frühzeitigen Erkennung der drohenden Infektion bei postoperativen Hämatomen. Sie muß sicherlich nicht routinemäßig, bei klinischem Verdacht aber frühzeitig durchgeführt werden. Das postoperative Spätergebnis mit lediglich einem Frühund Spätinfekt bei 100 operativen Eingriffen am Hüftgelenk und Oberschenkelschaft belegen die Bedeutung der frühzeitigen Hämatomdiagnostik.相似文献