全文获取类型
收费全文 | 1157篇 |
免费 | 101篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 44篇 |
妇产科学 | 9篇 |
基础医学 | 192篇 |
口腔科学 | 43篇 |
临床医学 | 59篇 |
内科学 | 178篇 |
皮肤病学 | 6篇 |
神经病学 | 101篇 |
特种医学 | 114篇 |
外科学 | 161篇 |
综合类 | 17篇 |
预防医学 | 44篇 |
眼科学 | 8篇 |
药学 | 217篇 |
肿瘤学 | 62篇 |
出版年
2019年 | 7篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 9篇 |
2015年 | 14篇 |
2014年 | 16篇 |
2013年 | 31篇 |
2012年 | 16篇 |
2011年 | 22篇 |
2010年 | 23篇 |
2009年 | 23篇 |
2008年 | 35篇 |
2007年 | 43篇 |
2006年 | 38篇 |
2005年 | 34篇 |
2004年 | 27篇 |
2003年 | 28篇 |
2002年 | 31篇 |
2001年 | 18篇 |
2000年 | 27篇 |
1999年 | 42篇 |
1998年 | 32篇 |
1997年 | 38篇 |
1996年 | 40篇 |
1995年 | 29篇 |
1994年 | 32篇 |
1993年 | 30篇 |
1992年 | 50篇 |
1991年 | 29篇 |
1990年 | 33篇 |
1989年 | 37篇 |
1988年 | 33篇 |
1987年 | 34篇 |
1986年 | 29篇 |
1985年 | 22篇 |
1984年 | 22篇 |
1983年 | 17篇 |
1982年 | 9篇 |
1981年 | 21篇 |
1980年 | 19篇 |
1979年 | 13篇 |
1978年 | 11篇 |
1977年 | 14篇 |
1976年 | 18篇 |
1975年 | 11篇 |
1974年 | 7篇 |
1969年 | 16篇 |
1968年 | 10篇 |
1967年 | 11篇 |
1966年 | 13篇 |
排序方式: 共有1264条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Nonlinear sensory cortex response to simultaneous tactile stimuli in writer's cramp. 总被引:1,自引:0,他引:1
Terence D Sanger Alvaro Pascual-Leone Daniel Tarsy Gottfried Schlaug 《Movement disorders》2002,17(1):105-111
Writer's cramp is a task-specific dystonia that leads to involuntary hand postures during writing. Abnormalities of sensory processing may play a pathophysiological role in this disorder. Electrophysiology studies in a monkey model of focal dystonia have revealed de-differentiation of sensory maps and the existence of single cells in hand regions of area 3b with enlarged receptive fields that extend to the surfaces of more than one digit. These changes may lead to abnormal processing of simultaneous sensory inputs. To study abnormal processing of simultaneous sensory information in adult humans with writer's cramp, we used functional magnetic resonance imaging to compare the response in primary sensory cortex with simultaneous tactile stimulation of the index and middle finger, with the response to stimulation of each finger alone. We tested five patients with writer's cramp and seven unaffected (normal) subjects. In the normal subjects, a linear combination of the activation patterns for individual finger stimulation predicts the pattern of activity for combined stimulation with 12% error. In writer's cramp patients, the linear combination predicted the combined stimulation pattern with 30% error. Results indicate a nonlinear interaction between the sensory cortical response to individual finger stimulation in writer's cramp. This altered interaction may contribute to the motor abnormalities. 相似文献
5.
Guo-Lin Wei Juri Melnik Jing-Li Luo Alan R. Sanger Karl T. Chuang 《Journal of electroanalytical chemistry (Lausanne, Switzerland)》2005,575(2):183-193
The performances of three widely different cathode materials (Pt, strontium-doped lanthanum manganite (LSM), and NiO) have been compared for use with proton conducting Li2SO4–Al2O3 composite electrolyte, using H2S–air and H2–air fuel cells operating at 600 °C. Surface analysis and electrochemical techniques were used to characterize fresh and used electrode materials. Pt or LSM cathodes each became covered with Li2SO4 and Al2O3 and, as a consequence, the fuel cells showed poor performance. In contrast, the NiO cathode catalyst did not become covered with Li2SO4 and good fuel cell performance was achieved. Exceptionally good current densities of over 100 mA/cm2 and power densities of over 30 mW/cm2 were obtained for H2S–air fuel cells having Mo–Ni–S anode catalysts. Slight agglomeration of NiO particles during fuel cell operation had only a minor effect on performance. 相似文献
6.
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
7.
H S Matloub C D Prevel J R Sanger N J Yousif C A Devine J Romano 《Annals of plastic surgery》1992,29(6):559-563
Several articles have been published that bring attention to the destructive potential of tire explosions. Although the severity of tire explosion injuries to the head and neck region is well established, only one previous article has reported injuries to the upper extremity. Fourteen patients with upper extremity tire explosion injuries have been treated by us from 1980 to 1988. Each injury was caused by single-piece wheel assemblies, as opposed to multipiece wheel assemblies, which have traditionally been associated with the injury. Three representative patient reports are discussed. Prevention of this injury can be achieved by increased public awareness, formal industrial safety training, tire servicing with dedicated equipment including restraining devices or barriers, complete evaluation of wheel/tire serviceability before tire mounting, separation of servicing of single and multipiece wheels, and complete tire deflation before servicing. 相似文献
8.
9.
Maternal serum and amniotic fluid alpha-fetoprotein testing has increased significantly in our laboratory and throughout the state since 1985. The results of this test are reported in a novel fashion as multiples of the median. The calculation and reporting of the test results are highly dependent upon gestational age, maternal weight, race and presence or absence of maternal diabetes. When properly interpreted alpha-fetoprotein determinations are a good screening test for early detection of neural tube defects and Trisomy 21 (Down Syndrome). Our approach to screening, diagnosis and counseling is discussed. 相似文献
10.