全文获取类型
收费全文 | 3260篇 |
免费 | 167篇 |
国内免费 | 55篇 |
专业分类
耳鼻咽喉 | 49篇 |
儿科学 | 141篇 |
妇产科学 | 38篇 |
基础医学 | 392篇 |
口腔科学 | 69篇 |
临床医学 | 312篇 |
内科学 | 565篇 |
皮肤病学 | 77篇 |
神经病学 | 182篇 |
特种医学 | 92篇 |
外科学 | 769篇 |
综合类 | 59篇 |
一般理论 | 4篇 |
预防医学 | 166篇 |
眼科学 | 144篇 |
药学 | 177篇 |
中国医学 | 13篇 |
肿瘤学 | 233篇 |
出版年
2023年 | 35篇 |
2022年 | 81篇 |
2021年 | 139篇 |
2020年 | 60篇 |
2019年 | 120篇 |
2018年 | 119篇 |
2017年 | 91篇 |
2016年 | 92篇 |
2015年 | 92篇 |
2014年 | 150篇 |
2013年 | 143篇 |
2012年 | 254篇 |
2011年 | 254篇 |
2010年 | 145篇 |
2009年 | 121篇 |
2008年 | 188篇 |
2007年 | 193篇 |
2006年 | 196篇 |
2005年 | 181篇 |
2004年 | 186篇 |
2003年 | 128篇 |
2002年 | 103篇 |
2001年 | 46篇 |
2000年 | 45篇 |
1999年 | 38篇 |
1998年 | 14篇 |
1997年 | 15篇 |
1996年 | 18篇 |
1995年 | 18篇 |
1994年 | 14篇 |
1993年 | 12篇 |
1992年 | 18篇 |
1991年 | 14篇 |
1990年 | 18篇 |
1989年 | 13篇 |
1988年 | 13篇 |
1987年 | 16篇 |
1986年 | 13篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 8篇 |
1982年 | 5篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 4篇 |
1976年 | 5篇 |
1974年 | 11篇 |
1973年 | 5篇 |
1972年 | 5篇 |
1970年 | 6篇 |
排序方式: 共有3482条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
46.
47.
Vinci G Anjot MN Trivin C Lottmann H Brauner R McElreavey K 《The Journal of clinical endocrinology and metabolism》2004,89(12):6282-6285
Anorchia, or the "vanishing testis syndrome," is characterized by the absence of testis in a 46,XY individual with a male phenotype. The etiology is unknown; however, the familial occurrence of the disease and the association of this phenotype with 46,XY gonadal dysgenesis has led to the suggestion that genetic factors, which play a role in testicular determination, may be involved. Alternatively, exploratory laparoscopy has suggested that anorchia may be caused by a prenatal testicular vascular accident associated with torsion during testicular descent. We screened a cohort of 14 boys with bilateral anorchia for mutations in the Y chromosome-linked testis-determining gene SRY (sex-determining region, Y chromosome); in the gene necessary for correct testicular descent, INSL3; and in the gene of its receptor (LGR8). Mutations in the INSL3 gene and the LGR8 T222P mutation are known to cause cryptorchidism. We confirmed previous reports that mutations in the SRY gene are not associated with anorchia. Although a common polymorphism was identified in the INSL3 gene, no mutations were observed. The recurrent T222P mutation in the LGR8 gene was not found in any of the patients. These data show for the first time a lack of association between genetic factors necessary for correct testicular descent and anorchia. 相似文献
48.
49.
50.
Ping Jia Charulatha Ramanathan Raja N Ghanem Kyungmoo Ryu Niraj Varma Yoram Rudy 《Heart rhythm》2006,3(3):296-310
BACKGROUND: Cardiac resynchronization therapy (CRT) for congestive heart failure patients with delayed left ventricular (LV) conduction is clinically beneficial in approximately 70% of patients. Unresolved issues include patient selection, lead placement, and efficacy of LV pacing alone. Being an electrical approach, detailed electrical information during CRT is critical to resolving these issues. However, electrical data from patients have been limited because of the requirement for invasive mapping. OBJECTIVES: The purpose of this study was to provide observations and insights on the variable electrophysiologic responses of the heart to CRT using electrocardiographic imaging (ECGI). METHODS: ECGI is a novel modality for noninvasive epicardial mapping. ECGI was conducted in eight patients undergoing CRT during native rhythm and various pacing modes. RESULTS: In native rhythm (six patients), ventricular activation was heterogeneous, with latest activation in the lateral LV base in three patients and in the anterolateral, midlateral, or inferior LV in the remainder of patients. Anterior LV was susceptible to block and slow conduction. Right ventricular pacing improved electrical synchrony in two of six patients. LV pacing in three of four patients involved fusion with intrinsic excitation resulting in electrical resynchronization similar to biventricular pacing. Although generally electrical synchrony improved significantly with biventricular pacing, it was not always accompanied by clinical benefit. CONCLUSION: Results suggest that (1) when accompanied by fusion, LV pacing alone can be as effective as biventricular pacing for electrical resynchronization; (2) right ventricular pacing is not effective for resynchronization; and (3) efficacy of CRT depends strongly on the patient-specific electrophysiologic substrate. 相似文献