全文获取类型
收费全文 | 2686篇 |
免费 | 179篇 |
国内免费 | 75篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 193篇 |
妇产科学 | 41篇 |
基础医学 | 291篇 |
口腔科学 | 58篇 |
临床医学 | 297篇 |
内科学 | 759篇 |
皮肤病学 | 77篇 |
神经病学 | 132篇 |
特种医学 | 414篇 |
外科学 | 174篇 |
综合类 | 65篇 |
预防医学 | 158篇 |
眼科学 | 23篇 |
药学 | 129篇 |
2篇 | |
肿瘤学 | 120篇 |
出版年
2021年 | 18篇 |
2020年 | 27篇 |
2019年 | 26篇 |
2018年 | 35篇 |
2017年 | 28篇 |
2016年 | 26篇 |
2015年 | 47篇 |
2014年 | 57篇 |
2013年 | 72篇 |
2012年 | 48篇 |
2011年 | 54篇 |
2010年 | 96篇 |
2009年 | 96篇 |
2008年 | 62篇 |
2007年 | 99篇 |
2006年 | 67篇 |
2005年 | 80篇 |
2004年 | 42篇 |
2003年 | 48篇 |
2002年 | 49篇 |
2001年 | 85篇 |
2000年 | 56篇 |
1999年 | 57篇 |
1998年 | 136篇 |
1997年 | 167篇 |
1996年 | 143篇 |
1995年 | 124篇 |
1994年 | 123篇 |
1993年 | 107篇 |
1992年 | 53篇 |
1991年 | 58篇 |
1990年 | 54篇 |
1989年 | 75篇 |
1988年 | 62篇 |
1987年 | 73篇 |
1986年 | 74篇 |
1985年 | 59篇 |
1984年 | 48篇 |
1983年 | 26篇 |
1982年 | 35篇 |
1981年 | 32篇 |
1980年 | 33篇 |
1979年 | 10篇 |
1978年 | 11篇 |
1977年 | 25篇 |
1976年 | 29篇 |
1975年 | 23篇 |
1974年 | 14篇 |
1972年 | 11篇 |
1971年 | 11篇 |
排序方式: 共有2940条查询结果,搜索用时 15 毫秒
1.
JM Martín† L Calduch† C Monteagudo‡ I Molina† D Ramón† V Alonso† E Jordᆠ《Journal of the European Academy of Dermatology and Venereology》2006,20(4):428-431
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified. 相似文献
2.
3.
Uptake of iodine-123 MIBG by pheochromocytomas, paragangliomas, and neuroblastomas: a histopathological comparison 总被引:2,自引:0,他引:2
J Bomanji D A Levison W D Flatman T Horne P M Bouloux G Ross K E Britton G M Besser 《Journal of nuclear medicine》1987,28(6):973-978
The percentage uptake of [123I]metaiodobenzylguanidine (MIBG) by tumors of the paraganglion system is compared with the number of neurosecretory granules (assessed by both light and electron microscopy) in the subsequently resected tumors in six patients. Iodine-123 MIBG was injected intravenously; the tumor uptake of [123I]MIBG varied between 0.001% and 0.14% of the injected dose per gram of tumor tissue at 22 hr. The number of neurosecretory granules in tissue sections was scored on a scale of I-III. A direct proportional correlation was found between the percentage uptake of [123I]MIBG by the tumor and the number of neurosecretory granules in the tissue sections but not with plasma or urinary catecholamines. This technique for imaging reflects the storage status of the tumor better than plasma and urinary catecholamine measurements. 相似文献
4.
S. Tsagarakis Feng Ge L. H. Rees G. M. Besser A. Grossman 《Journal of neuroendocrinology》1989,1(2):129-133
While extensive evidence suggests that adrenoceptors play an important role in the control of growth hormone in the rat, there are few studies involving the direct measurement of growth hormone-releasing hormone (GHRH). We have therefore developed a radioimmunoassay for rat GHRH, and used it to investigate the modulation of GHRH release by noradrenaline from incubated rat hypothalamus in vitro. The GHRH radioimmunoassay had no significant cross-reactivity with other hypothalamic or GHRH-related peptides, and was sensitive to 4 pg/tube; intra- and interassay coefficients of variation were 6% and 12% respectively. Single incubated rat hypothalami produced a stable and readily measurable output of GHRH in successive 20 min incubations after an initial 60 min preincubation; the release of GHRH was increased in the presence of 56 mM KCI, but did not respond to KCI-depolarization when calcium was excluded from the medium. Stimulated GHRH release was identical to synthetic rat GHRH(1–43) on high-performance liquid chromatography and Sephadex G-75 chromatography.
Noradrenaline stimulated GHRH secretion in a dose-dependent manner in the concentration range 10−10 — 10−6 M, with a plateau in response at 10−7 M. Stimulation with noradrenaline 10−7 M was blocked by idazoxan 10−5 M and attenuated by thymoxamine 10−5 M, but was unaffected by timolol 10−5 M. Both the α2 -adrenoceptor agonist guanfacine, and the α1 -adrenoceptor agonist methoxamine, specifically stimulated GHRH secretion.
It is concluded that noradrenaline stimulates the release of GHRH at both α1 and α2 -adrenoceptors. 相似文献
Noradrenaline stimulated GHRH secretion in a dose-dependent manner in the concentration range 10
It is concluded that noradrenaline stimulates the release of GHRH at both α
5.
JM Vilanova J Figueras-Aloy J Roselló G Gómez E Gelpí R Jiménez 《Acta paediatrica (Oslo, Norway : 1992)》1998,87(5):588-592
The aim of this study was to evaluate the cerebral synthesis of eicosanoids in the asphyctic newborn and to investigate the relation between the prostanoid profiles in cerebrospinal fluid (CSF) and the appearance and severity of hypoxic-ischaemic encephalopathy (HIE). Levels of 6-keto-PGF 1-α, TXB2 , PGE2 and PGF2-α in CSF were measured in 40 full term newborns during the first day of life. Thirty of these newborns had birth asphyxia and were divided into three groups: 10 without HIE, 12 with mild HIE and 8 with moderate-severe HIE. They were compared to a control group of 10 non-hypoxic newborns. Determinations of the metabolites in CSF were performed by RIA and expressed as pg/ml (mean ± SD). The CSF TXB2 (thromboxane A2 metabolite) in asphyxiated newborns was always higher than in the control group (28.12 ± 10.6), and related to the severity of HIE ( p = 0:005): without HIE (50.84 ± 16.4; p = 0:02), mild HIE (80.65 ± 12.64; p ± 0:01) and moderate-severe HIE (178.14 ± 20.5; p < 0:01). The CSF 6-keto-PGF 1-α (prostacyclin metabolite) in asphyxiated newborns was always higher than in the control group (80.55 ± 12.56), but indirectly related to the severity of HIE: without HIE (240.95 ± 28.12; p < 0:01), mild HIE (183.65 ± 30.1; p < 0:01) and moderate-severe HIE (140.55 ± 25.12; p < 0:01). In the moderate-severe HIE group, the increase in TXB2 was higher than the rise in 6-keto-PGF 1-α . 相似文献
6.
7.
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
8.
9.
Stroke prophylaxis in patients with moyamoya disease has not been described previously in Australia. Two cases are presented in which superficial temporal to middle cerebral arterial bypass has been successful in halting the progress of the disease. The presentation, investigation and management of this occlusive vasculopathy are discussed. 相似文献
10.