全文获取类型
收费全文 | 9625篇 |
免费 | 610篇 |
国内免费 | 188篇 |
专业分类
耳鼻咽喉 | 209篇 |
儿科学 | 82篇 |
妇产科学 | 51篇 |
基础医学 | 1790篇 |
口腔科学 | 174篇 |
临床医学 | 912篇 |
内科学 | 2308篇 |
皮肤病学 | 358篇 |
神经病学 | 718篇 |
特种医学 | 541篇 |
外科学 | 974篇 |
综合类 | 77篇 |
现状与发展 | 1篇 |
预防医学 | 372篇 |
眼科学 | 117篇 |
药学 | 925篇 |
1篇 | |
中国医学 | 169篇 |
肿瘤学 | 644篇 |
出版年
2024年 | 7篇 |
2023年 | 88篇 |
2022年 | 308篇 |
2021年 | 496篇 |
2020年 | 211篇 |
2019年 | 270篇 |
2018年 | 318篇 |
2017年 | 226篇 |
2016年 | 364篇 |
2015年 | 465篇 |
2014年 | 565篇 |
2013年 | 610篇 |
2012年 | 1057篇 |
2011年 | 934篇 |
2010年 | 485篇 |
2009年 | 391篇 |
2008年 | 516篇 |
2007年 | 502篇 |
2006年 | 401篇 |
2005年 | 392篇 |
2004年 | 270篇 |
2003年 | 267篇 |
2002年 | 218篇 |
2001年 | 173篇 |
2000年 | 174篇 |
1999年 | 133篇 |
1998年 | 73篇 |
1997年 | 67篇 |
1996年 | 40篇 |
1995年 | 38篇 |
1994年 | 36篇 |
1993年 | 29篇 |
1992年 | 29篇 |
1991年 | 22篇 |
1990年 | 30篇 |
1989年 | 25篇 |
1988年 | 34篇 |
1987年 | 23篇 |
1986年 | 20篇 |
1985年 | 22篇 |
1984年 | 8篇 |
1983年 | 6篇 |
1981年 | 10篇 |
1979年 | 6篇 |
1978年 | 6篇 |
1976年 | 5篇 |
1967年 | 4篇 |
1959年 | 4篇 |
1958年 | 5篇 |
1956年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Vascular endothelial growth factor gene polymorphisms and risk of primary lung cancer. 总被引:17,自引:0,他引:17
Su Jeong Lee Sin Yeob Lee Hyo-Sung Jeon Sun Ha Park Jin Sung Jang Ga Young Lee Ji Woong Son Chang Ho Kim Won Kee Lee Sin Kam Rang Woon Park Tae-In Park Young Mo Kang In-San Kim Tae Hoon Jung Jae Yong Park 《Cancer epidemiology, biomarkers & prevention》2005,14(3):571-575
Angiogenesis is an essential process in the development, growth, and metastasis of malignant tumors including lung cancer. DNA sequence variations in the vascular endothelial growth factor (VEGF) gene may lead to altered VEGF production and/or activity, thereby causing interindividual differences in the susceptibility to lung cancer via their actions on the pathways of tumor angiogenesis. To test this hypothesis, we investigated the potential association between three VEGF polymorphisms (-460T > C, +405C > G, and 936C > T)/haplotypes and the risk of lung cancer in a Korean population. VEGF genotypes were determined in 432 lung cancer patients and 432 healthy controls that were frequency matched for age and sex. VEGF haplotypes were predicted using Bayesian algorithm in the phase program. Compared with the combined +405 CC and CG genotype, the +405 GG genotype found associated with a significantly decreased risk of small cell carcinoma [SCC; adjusted odds ratio (OR), 0.36; 95% confidence interval (95% CI), 0.17-0.78]. The 936 CT genotype and the combined 936 CT and TT genotype were also associated with a significantly decreased risk of SCC compared with the 936 CC genotype (adjusted OR, 0.47; 95% CI, 0.26-0.85 and adjusted OR, 0.44; 95% CI, 0.24-0.80, respectively). Haplotype CGT was associated with a significantly decreased risk of SCC (adjusted OR, 0.39; 95% CI, 0.18-0.87), whereas haplotype TCC conferred a significantly increased risk of SCC (adjusted OR, 1.63; 95% CI, 1.14-2.33). None of the VEGF polymorphisms studied significantly influenced the susceptibility to lung cancer except SCC. However, haplotypes TCT and TGT were significantly associated with the risk of overall lung cancer, respectively (adjusted OR, 0.38; 95% CI, 0.25-0.60 and adjusted OR, 3.94; 95% CI, 2.00-7.76, respectively). These effects of haplotypes TCT and TGT on lung cancer risk were observed in three major histologic types of lung cancer. These results suggest that the VEGF gene may be contribute to an inherited predisposition to lung cancer. 相似文献
92.
93.
94.
95.
Gang Chen Alexander J Chan Josiah I Chung Jessica C Jang Lisa C Osborne Meera G Nair 《Gut microbes》2014,5(3):363-368
Citrobacter rodentium infection is a murine model of pathogenic Escherichia coli infection that allows investigation of the cellular and molecular mechanisms involved in host-protective immunity and bacterial-induced intestinal inflammation. We recently demonstrated that following C. rodentium infection, the absence of Resistin-Like Molecule (RELM) α resulted in attenuated Th17 cell responses and reduced intestinal inflammation with minimal effects on bacterial clearance. In this addendum, we investigated the cytokine modulatory effects of RELMα and RELMα expression in the intestinal mucosa following C. rodentium infection. We show that in addition to promoting Th17 cytokine responses, RELMα inhibits Th2 cytokine expression and Th2-cytokine effector macrophage responses in the C. rodentium-infected colons. Second, utilizing reporter C. rodentium, we examined RELMα expression and macrophage recruitment at the host pathogen interface. We observed infection-induced macrophage infiltration and RELMα expression by intestinal epithelial cells. The influence of infection-induced RELMα on macrophage recruitment in the intestine is discussed. 相似文献
96.
Dahae Won Chan‐Jeoung Park Hyoeun Shim Seongsoo Jang Hyun‐Sook Chi Jooryung Huh Dok Hyun Yoon Cheolwon Suh 《Histopathology》2013,62(3):397-405
Aims: Bone marrow (BM) biopsies of some mucosa‐associated lymphoid tissue (MALT) lymphoma patients show scattered or small clusters of CD20+ cells without definite lesions (subtle CD20 positivity). The aim of this study was to evaluate the clinical significance of BM involvement and subtle CD20 positivity in 122 patients diagnosed with MALT lymphoma. Methods and results: Patients were divided into three categories: BM involvement [BM(+)], subtle CD20 positivity, and no BM involvement [BM(?)]. Eleven (9%) showed BM involvement, and 17 (14%) showed subtle CD20 positivity. BM(+) patients had significantly worse progression‐free survival (PFS) than BM(?) patients [hazard ratio (HR) 6.25, P = 0.01], but there was no significant difference between subtle CD20 positivity and BM(?) patients. Patients with >30 CD3+ cells among 100 nucleated cells in the areas with increased numbers of CD3+ cells had significantly worse PFS than those with <15 CD3+ cells (HR 5.49, P = 0.02). BM(+) patients with >30 CD3+ cells had worse PFS than those with ≤30 CD3+ cells (P = 0.029), with an extent of BM(+) involvement of >10% positively correlating with >30 CD3+ cells (P = 0.015). Conclusions: Patients with BM(+) MALT lymphoma showed significantly worse PFS than those with subtle CD20 positivity and BM(?) MALT lymphoma, but the PFS of patients with subtle CD20 positivity MALT lymphoma was not significantly different from that of those with BM(?) MALT lymphoma. Increased numbers of BM T cells in MALT lymphoma patients might be suggestive of a worse prognosis. 相似文献
97.
98.
Yoon Jin Kong Hye Sun Choi Jae Woo Jang Sung Joo Kim Sun Young Jang 《Korean journal of ophthalmology : KJO》2015,29(6):368-374
PurposeThis study investigated the surgical outcomes of canalicular trephination combined with endoscopic dacryocystorhinostomy (DCR) in patients with a distal or common canalicular obstruction. It also identified the factors affecting surgical success rates associated with this technique.MethodsWe retrospectively reviewed the medical records of 57 patients (59 eyes) in whom a canalicular obstruction was encountered during endoscopic DCR. All patients were treated with endoscopic DCR, followed by canalicular trephination and silicone tube placement. The surgical outcome was categorized as a functional success according to the patient''s subjective assessment of symptoms, including epiphora, and as an anatomical success according to a postoperative nasolacrimal duct irrigation test. Surgical success rates were compared based on age, sex, location of the obstruction, number of silicone tubes, and experience of the surgeon.ResultsFunctional success was achieved in 55 of 59 eyes (93%) at one month, 50 eyes (84%) at three months, and 46 eyes (78%) at six months. Anatomical success was achieved in 58 of 59 eyes (98%) at one month, 52 eyes (88%) at three months, and 50 eyes (84%) at six months. There was a statistically significant difference in surgical outcome according to the experience of the surgeon. The anatomical success rate at the six-month follow-up exam was 95.4% in the >5 years of experience group, and 53.3% in the <5 years of experience group (p = 0.008, Pearson chi-square test).ConclusionsThe success rate of canalicular trephination combined with endoscopic DCR in patients with a distal or common canalicular obstruction decreased gradually during the six-month follow-up period. In particular, patients undergoing procedures with experienced surgeons tended to show excellent surgical outcomes at the six-month follow-up exam. 相似文献
99.
Recombinant human thyrotropin‐stimulated thyroglobulin level at the time of radioactive iodine ablation is an independent prognostic marker of differentiated thyroid carcinoma in the setting of prophylactic central neck dissection 下载免费PDF全文
100.
正The ascending reticular activating system(ARAS)plays a key role in the control of arousal and awareness for consciousness(Paus,2000;Zeman,2001;Van der Werf et al.,2002;Weiss et al.,2007;Siposan and Aliu,2014).It is well known that the ARAS originates from the reticular formation(RF)of the brainstem,and connects to the cerebral cortex via intralaminar 相似文献