全文获取类型
收费全文 | 5433篇 |
免费 | 440篇 |
国内免费 | 141篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 113篇 |
妇产科学 | 71篇 |
基础医学 | 1116篇 |
口腔科学 | 186篇 |
临床医学 | 316篇 |
内科学 | 805篇 |
皮肤病学 | 130篇 |
神经病学 | 377篇 |
特种医学 | 78篇 |
外科学 | 496篇 |
综合类 | 602篇 |
现状与发展 | 2篇 |
预防医学 | 204篇 |
眼科学 | 56篇 |
药学 | 802篇 |
中国医学 | 163篇 |
肿瘤学 | 474篇 |
出版年
2023年 | 77篇 |
2022年 | 123篇 |
2021年 | 185篇 |
2020年 | 126篇 |
2019年 | 210篇 |
2018年 | 176篇 |
2017年 | 142篇 |
2016年 | 157篇 |
2015年 | 167篇 |
2014年 | 278篇 |
2013年 | 329篇 |
2012年 | 240篇 |
2011年 | 351篇 |
2010年 | 274篇 |
2009年 | 284篇 |
2008年 | 264篇 |
2007年 | 299篇 |
2006年 | 298篇 |
2005年 | 232篇 |
2004年 | 208篇 |
2003年 | 211篇 |
2002年 | 159篇 |
2001年 | 121篇 |
2000年 | 92篇 |
1999年 | 78篇 |
1998年 | 56篇 |
1997年 | 46篇 |
1996年 | 47篇 |
1995年 | 66篇 |
1994年 | 54篇 |
1993年 | 49篇 |
1992年 | 29篇 |
1991年 | 42篇 |
1990年 | 24篇 |
1989年 | 22篇 |
1988年 | 26篇 |
1987年 | 24篇 |
1986年 | 27篇 |
1985年 | 48篇 |
1984年 | 54篇 |
1983年 | 58篇 |
1982年 | 38篇 |
1981年 | 34篇 |
1980年 | 41篇 |
1979年 | 23篇 |
1978年 | 24篇 |
1977年 | 16篇 |
1976年 | 17篇 |
1975年 | 15篇 |
1974年 | 13篇 |
排序方式: 共有6014条查询结果,搜索用时 31 毫秒
1.
《Journal of labelled compounds & radiopharmaceuticals》2006,49(4):339-343
Condensation of thiourea 1 with diethyl malonate 2 in the presence of sodium methoxide furnished 4,6‐dihydroxy‐2‐mercaptopyrimidine 3 . Compound 3 on methylation with diazomethane followed by oxidation with H5IO6/CrO3 in ethyl acetate gave 4,6‐dimethoxy‐2‐methylsulphonylpyrimidine 5 . Compound 5 on condensation with 2‐mercapto‐6‐chlorobenzoic acid in the presence of a phase transfer catalyst, tetrabutylammonium bromide and sodium carbonate gave the title compound – pyrithiobac‐sodium 6 with an overall yield of > 35% starting from thiourea. Following the above standardized procedure, using [14C]‐thiourea in lieu of thiourea, 14C labelled product 6 , was synthesized with an overall radiochemical yield > 30% (with respect to [14C]‐thiourea) for further evaluations of environmental fate of 6 , in soils and plants. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
2.
稳定性核素测定大鼠小肠蛋白质合成 总被引:2,自引:1,他引:1
目的:建立稳定性核素([L-^15N]亮氨酸)测定大鼠小肠蛋白质合成率的方法。方法:分别测定静脉注射相同剂量[L-^15N]亮氨酸不同时相的大鼠小肠^15N丰度及不同剂量[L-^15N]亮氨酸同一时相的大鼠小肠^15N丰度。结果:大鼠小肠游离氨基酸池中^15N核素丰度在注射后0.5h内呈线性上升并达高峰,维持4h后缓慢下降,小肠蛋白质中的^15N丰度0.5h至12h基本维持不变;随着注射剂量的增加,大鼠小肠蛋白质分数合成率(FSR)亦增加,当[L-^15N]亮氨酸剂量在1.0mmol/kg以上,FSR并不随施加[L15N]亮氨酸剂量的加大而增加。结论:在进行大鼠小肠蛋白质合成率测定时,一次性静脉注射的测量最佳时限为0.5h,剂量为1.0mmol/kg。 相似文献
3.
K. C. Lødrup Carlsen M. Løvik B. Granum P. Mowinckel K. H. Carlsen 《Pediatric allergy and immunology》2006,17(4):304-312
The endotoxin receptor soluble CD14 (sCD14) has been implicated in the 'hygiene hypothesis' suggesting reduced allergic sensitization with bacterial stimulation. However, the relationship between early life sCD14 and allergic diseases is conflicting. We aimed to investigate whether possible risk factors for allergic diseases were associated with sCD14 levels at 2 yr of age. In the nested case-control study of the birth cohort studies 'Environment and Childhood Asthma study in Oslo' 411 children selected with recurrent bronchial obstruction (rBO) (n=241) and no bronchial obstruction (n=170) by 2 yr were investigated with skin prick test and structured parental interview at age 2 yr. Exposure to tobacco smoke, pets and infections was recorded semi-annually by questionnaires (0-2 yr). The sCD14 was analysed from frozen, stored serum by ELISA technique. Regression analyses were performed in all subjects with complete data (n=406, 180 girls), and in girls and in boys separately. Mean sCD14 (ng/ml) was significantly higher among girls 2035 (1973-2096) vs. 1947 (1890-2004) (boys). The sCD14 was significantly reduced among girls exposed to antenatal maternal smoking and with parental asthma, after adjusting for age, parental rhino-conjunctivitis, pet keeping and childhood infections. Recurrent otitis media (OM) increased and common colds significantly decreased sCD14 levels in girls. Boys with atopic dermatitis and rBO had reduced sCD14. Pet exposure was not significantly associated with sCD14. We report novel gender-related effects of sCD14 in early life and suggest that gender, tobacco smoke exposure, age and middle ear disease in particular should be accounted for when assessing the role of sCD14 in childhood allergic diseases. 相似文献
4.
Soluble CD30 in pediatric patients with atopic dermatitis 总被引:9,自引:1,他引:8
Atopic dermatitis (AD) is a chronic, inflammatory skin disease in which a pathogenetic role of Th2 cells has been supposed. This study investigated the presence of soluble CD30 (sCD30), an activation marker of T-cell clones able to produce Th2-type cytokines, in sera from pediatric patients affected by AD ( n =25) with no symptoms of asthma or rhinitis. The severity of the disease was graded by both the SCORAD and Costa et al. clinical scoring systems. Serum levels of sCD30 were significantly higher in patients with AD in respect to both normal donors ( n =20) and urticaria patients ( n = 10), and a positive correlation between serum sCD30 and clinical score was found ( r =0.508; P =0.01) when AD patients were evaluated by Costa et al.'s method. Furthermore, a significant association ( r -=0.443; P =0.027) between sCD30 and serum levels of the soluble interleukin (IL)-2 receptor (sIL-2R) was observed in AD. The presence of high amounts of sCD30 in atopic patients seems to confirm the role of this molecule as an activation marker useful for in vivo evaluation of a Th2 immune response, and the correlation observed with both clinical score and sIL-2R levels indicates the role of sCD30 as an additional marker of disease activity in pediatric patients with AD. 相似文献
5.
Jasper E Visser Bastiaan R Bloem Bart P C van de Warrenburg 《Movement disorders》2007,22(7):1024-1026
Progressive myoclonic ataxia, also referred to as Ramsay Hunt syndrome, is characterized by a combination of myoclonus and cerebellar ataxia, infrequently accompanied by tonic-clonic seizures. Its differential diagnosis overlaps with progressive myoclonic epilepsy, a syndrome with myoclonus, tonic-clonic seizures, progressive ataxia and dementia. In patients with progressive myoclonic epilepsy, specific diseases can frequently be recognized, but the diagnostic yield in progressive myoclonic ataxia is much lower. We describe a patient who presented with multifocal myoclonus in his thirties and who later developed cerebellar ataxia and focal dystonia. His father was similarly affected. Genetic studies revealed a mutation in the protein kinase C gamma (PRKCG) gene, known to cause spinocerebellar ataxia type 14 (SCA-14). This case illustrates that both myoclonus and dystonia are part of the clinical spectrum in SCA-14 and that myoclonus can even be the presenting symptom. We suggest that SCA-14 should be considered in the differential diagnosis of progressive myoclonic ataxia. 相似文献
6.
Sumei Ren Paul McNamara Pernilla Royster Jae Lee Surinderjit S. Saluja David Koharski Sharon Hendershot Van Truong 《Journal of labelled compounds & radiopharmaceuticals》2007,50(7):643-648
1‐Benzyl‐4‐hydroxy[2‐14C]piperidine, a useful intermediate in labeled compound synthesis, was prepared from [14C]formaldehyde in high yield. The distribution pattern of 14C in the product is consistent with a mechanism involving reversible iminium ion formation and rapid equilibration of the iminium ion through a cationic aza‐Cope rearrangement. These steps precede the rate‐determining intramolecular cyclization step. SCH 351125 is a potent, selective CCR5 receptor antagonist with potential as a treatment for HIV infection. [14C]SCH 351125, required for metabolism studies, was prepared from 1‐benzyl‐4‐hydroxy[2‐14C]piperidine in six steps. [14C]SCH 351125 is a mixture of four atropisomers. Preparation of [14C]SCH 351125 besylate salt of the desired atropisomer pair is also described. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
7.
《Journal of labelled compounds & radiopharmaceuticals》2005,48(1):25-30
The natural products avemectin B 1a 1a and B 1b 1b were each site‐specifically 14C labelled at carbon 23 in a convergent synthesis for metabolism, residue, and environmental studies. The 12‐step radiosynthesis involved a stereoselective aldol condensation and later a coupling to a protected avermectin degradate 2 in a one‐pot Wittig condensation/spiroketalization to reconstitute the dioxaspirane configuration found in the natural products. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
8.
9.
Soluble CD14 but not interleukin-6 is a new marker for clinical activity in atopic dermatitis 总被引:4,自引:0,他引:4
Summary Levels of soluble IL-2 receptors, IL-6, soluble CD23, soluble CD14 and ECP (eosinophilic cationic protein) were measured as markers of T-cell, B-cell, monocyte and eosinophilic leucocyte activation in 26 patients with atopic dermatitis (AD) on admission to (A) and at discharge from (D) the Department of Dermatology in Zurich. The serum levels of sIL-2R, IL-6, sCD23, sCD14 and ECP were significantly elevated in AD patients in comparison with the normal values of healthy donors. A significant decrease in sIL-2R (p=0.0093) and in sCD14 (p=0.0134) levels was demonstrated between A and D, correlating with the improvement in the skin intensity score (SIS). In addition, a significant correlation of the sCD14 levels and the SIS at A was demonstrated (p=0.0415). These results also incriminate monocytes in the pathogenesis of AD, indicating that, besides sIL-2R and ECP, SCD14 could also be a possible marker for the disease activity. 相似文献
10.
作者曾经体外实验证明,均聚寡脱氧胞嘧啶核苷酸片段(dC14)有抗病毒活性,现继续研究其在体内的作用。不给dC14的对照组小鼠,接种腹水瘤细胞后:100%发病和死亡,潜伏期为6d,存活期11d;给每只小鼠dC14 1.3~3.2 mg,发病率和死亡率降低至20%,疾病潜伏期和存活期推迟。在未经dC14处理的种瘤细胞和淋巴组织与经处理的淋巴组织中,多聚酶链反应(PCR)法都检测到病毒核酸,而正常小鼠中则无此种病毒核酸顺序。研究结果提示,dC14对小鼠SRS腹水瘤的发病和生长有抑制作用。此种抑制作用可能是通过抑制病毒基因的表达来实现的。 相似文献