全文获取类型
收费全文 | 515篇 |
免费 | 40篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 32篇 |
妇产科学 | 13篇 |
基础医学 | 75篇 |
口腔科学 | 30篇 |
临床医学 | 59篇 |
内科学 | 73篇 |
皮肤病学 | 5篇 |
神经病学 | 66篇 |
特种医学 | 61篇 |
外科学 | 47篇 |
综合类 | 29篇 |
预防医学 | 26篇 |
药学 | 20篇 |
中国医学 | 4篇 |
肿瘤学 | 19篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 10篇 |
2020年 | 6篇 |
2019年 | 3篇 |
2018年 | 9篇 |
2017年 | 6篇 |
2016年 | 7篇 |
2015年 | 12篇 |
2014年 | 8篇 |
2013年 | 21篇 |
2012年 | 22篇 |
2011年 | 24篇 |
2010年 | 32篇 |
2009年 | 17篇 |
2008年 | 20篇 |
2007年 | 17篇 |
2006年 | 21篇 |
2005年 | 18篇 |
2004年 | 18篇 |
2003年 | 14篇 |
2002年 | 9篇 |
2001年 | 10篇 |
2000年 | 12篇 |
1999年 | 4篇 |
1998年 | 24篇 |
1997年 | 15篇 |
1996年 | 22篇 |
1995年 | 11篇 |
1994年 | 14篇 |
1993年 | 9篇 |
1992年 | 6篇 |
1991年 | 12篇 |
1990年 | 14篇 |
1989年 | 12篇 |
1988年 | 14篇 |
1987年 | 18篇 |
1986年 | 17篇 |
1985年 | 7篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 8篇 |
1981年 | 2篇 |
1980年 | 5篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1971年 | 2篇 |
排序方式: 共有560条查询结果,搜索用时 15 毫秒
91.
Autism spectrum disorders are a heterogeneous group of behaviorally defined disorders having complex etiologies. We previously reported a direct correlation between lower plasma levels of the immunoglobulins (Ig) IgG and IgM and increased severity of behavioral symptoms in children with autism. Our current objective was to determine if these reduced plasma levels of IgG and IgM are the result of defective B cell development, activation, or function. Results suggest no differences in the B cell parameters measured, indicating that decreased Ig in autism is not a result of B cell dysfunction and other immune cells might be involved. 相似文献
92.
目的探讨新疆护理教师工作压力现状并分析其影响因素,为提出护理教师队伍建设的相关对策提供实证依据并为护理院校管理和教师人才队伍的可持续发展提出建议。方法采用高职教师工作压力量表对新疆15个地、市、州抽取的10所护理院校在编在岗的256位护理教师进行问卷调查,调查其工作压力现状并分析其影响因素。结果护理专职教师的工作压力得分为(2.436±0.576)分,大于2分,说明教师的工作压力大。教龄、婚姻、兼职情况及教学工作量不同的教师因社会因素而产生的工作压力水平不同,不同婚姻状况的教师因学校管理及制度因素产生的压力水平不同,性别、年龄、学历、婚姻、教学工作量不同的教师个人职业发展所带来的压力水平不同,性别、教龄、每周课时量等在护理院校教师工作压力不同;年龄、婚姻状况、教学工作量不同的教师因人际关系产生的工作压力水平不同,性别、年龄、教龄、职称、婚姻、教学工作量、收入水平及兼职情况不同的教师因工作负荷压力水平不同,性别、职称、婚姻、教学工作量、担任教学课程不同的教师因个人特质因素带来的工作压力不同,差异均有统计学意义(P〈0.05)。结论护理专职教师的工作压力大,来源是多方面的,学校管理制度和社会因素带来的压力最大,因此应尽快改变社会各界对护理教育认识上的不足和偏见,明确护理教育的定位,加大国家对护理教育的投入,同时护理教师应提高对自己职业的认识,合理制定自己的职业生涯发展规划。 相似文献
93.
94.
The clinical, histologic, and immunologic features of 24 cases of multilobated B-cell lymphoma are presented and compared with those of previously reported cases. Cases were included in this study when more than 50% of the tumor cells had nuclear multilobation. There were 13 males and 11 females with an age range of 13 to 79 years. A slight predominance of node-based presentations was observed. Seventeen patients (71%) presented with advanced (stage III or IV) disease. Complete remissions were achieved in 13 (59%) of 22 patients, and 14 (58%) of the 24 patients were still alive after a follow-up period ranging from 10 to 124 months. The 1-year survival was 65% (SE = 10%). Relapses occurred in 4 (31%) of 13 patients with complete responses. These observations, together with those previously reported, support the conclusion that the multilobated B-cell variant of non-Hodgkin's lymphoma behaves in a fashion similar to that of the intermediate-grade, diffuse, large-cell non-Hodgkin's lymphomas. 相似文献
95.
96.
97.
Sema HEPEN Pnar AKHANLI Hakan DÜER Murat ALAPKULU Bekir UAN Muhammed Erkam SENCAR Davut SAKIZ lknur
ZTÜRK ÜNSAL Seyit Murat BAYRAM Mustafa
ZBEK Erman AKAL 《Turkish Journal of Medical Sciences》2021,51(5):2592
Background/aimThe known pathogenesis of diabetes mellitus (DM) in acromegaly is mainly based on growth hormone (GH) and insulin-like growth factor-1 (IGF-1) excess. Fatty acid-binding protein 4 (FABP-4), a novel adipokine, is found to induce insulin resistance and type 2 DM. We aimed to investigate the possible effect of FABP-4 on glucose metabolism in patients with acromegaly.Materials and methodsThis case-control study included 28 patients newly diagnosed with acromegaly and 57 healthy volunteers. The patients with acromegaly were classified according to their glycemic status as with DM, prediabetes, and normal glucose tolerance. Anthropometric measurements, laboratory test results, and FABP-4 levels of the subjects were evaluated.ResultsAlthough no difference was observed in FABP-4 levels between acromegaly and control groups, the FABP-4 level was higher in the patients with acromegaly having DM compared to the patients with acromegaly having prediabetes and NGT, and the control group (p = 0.004, p = 0.001, p = 0.004, respectively). Logistic regression analysis suggested that the FABP-4 is an independent predictor of DM in acromegaly (β = 7.382, OR = 38.96, 95% CI: 1.52-5.76, p = 0.018).Conclusion The FABP-4 may be a helpful predictor of acromegaly-associated DM. 相似文献
98.
目的探讨不同类型肾脏占位病变的超声造影特点。方法对照病理诊断结果分析76例肾脏占位病变Sono Vue超声造影特征。结果肾恶性肿瘤62例,良性肿瘤14例。肾恶性肿瘤超声造影剂的充盈和消退呈多样性,以同步增强和快增强多见,造影剂的快速消退和缓慢消退之间无明显差别,差异无统计学意义(P>0.05)。恶性肿瘤典型的表现是整个病灶弥漫增强,轮廓边界清晰,呈"亮球"征(95.2%),并多有假包膜(87.1%)。肾错构瘤表现为无假包膜的不均匀增强,而肾囊肿始终无增强。结论超声造影有助于肾占位病变的鉴别诊断和预后判断。 相似文献
99.
Weinberg JB; Misukonis MA; Shami PJ; Mason SN; Sauls DL; Dittman WA; Wood ER; Smith GK; McDonald B; Bachus KE 《Blood》1995,86(3):1184-1195
100.
J. Tillmann K. Ashwood M. Absoud S. Bölte F. Bonnet-Brilhault J. K. Buitelaar S. Calderoni R. Calvo R. Canal-Bedia R. Canitano A. De Bildt M. Gomot P. J. Hoekstra A. Kaale H. McConachie D. G. Murphy A. Narzisi I. Oosterling M. Pejovic-Milovancevic A. M. Persico O. Puig H. Roeyers N. Rommelse R. Sacco V. Scandurra A. C. Stanfield E. Zander T. Charman 《Journal of autism and developmental disorders》2018,48(7):2490-2505
Research on sex-related differences in Autism Spectrum Disorder (ASD) has been impeded by small samples. We pooled 28 datasets from 18 sites across nine European countries to examine sex differences in the ASD phenotype on the ADI-R (376 females, 1763 males) and ADOS (233 females, 1187 males). On the ADI-R, early childhood restricted and repetitive behaviours were lower in females than males, alongside comparable levels of social interaction and communication difficulties in females and males. Current ADI-R and ADOS scores showed no sex differences for ASD severity. There were lower socio-communicative symptoms in older compared to younger individuals. This large European ASD sample adds to the literature on sex and age variations of ASD symptomatology. 相似文献