全文获取类型
收费全文 | 1334069篇 |
免费 | 101962篇 |
国内免费 | 4263篇 |
专业分类
耳鼻咽喉 | 16809篇 |
儿科学 | 43586篇 |
妇产科学 | 36364篇 |
基础医学 | 197885篇 |
口腔科学 | 35902篇 |
临床医学 | 129607篇 |
内科学 | 258380篇 |
皮肤病学 | 26373篇 |
神经病学 | 111887篇 |
特种医学 | 48185篇 |
外国民族医学 | 366篇 |
外科学 | 184087篇 |
综合类 | 28774篇 |
现状与发展 | 1篇 |
一般理论 | 461篇 |
预防医学 | 114451篇 |
眼科学 | 28979篇 |
药学 | 98835篇 |
6篇 | |
中国医学 | 3166篇 |
肿瘤学 | 76190篇 |
出版年
2021年 | 10905篇 |
2019年 | 11641篇 |
2018年 | 16330篇 |
2017年 | 12291篇 |
2016年 | 13247篇 |
2015年 | 15198篇 |
2014年 | 20809篇 |
2013年 | 32070篇 |
2012年 | 44265篇 |
2011年 | 46915篇 |
2010年 | 27092篇 |
2009年 | 24945篇 |
2008年 | 42745篇 |
2007年 | 45088篇 |
2006年 | 45196篇 |
2005年 | 43612篇 |
2004年 | 41575篇 |
2003年 | 39510篇 |
2002年 | 38334篇 |
2001年 | 60859篇 |
2000年 | 62525篇 |
1999年 | 52293篇 |
1998年 | 14585篇 |
1997年 | 13282篇 |
1996年 | 13118篇 |
1995年 | 12459篇 |
1994年 | 11629篇 |
1993年 | 10926篇 |
1992年 | 41584篇 |
1991年 | 40775篇 |
1990年 | 39460篇 |
1989年 | 37354篇 |
1988年 | 34595篇 |
1987年 | 33706篇 |
1986年 | 32164篇 |
1985年 | 30647篇 |
1984年 | 23038篇 |
1983年 | 19594篇 |
1982年 | 11758篇 |
1979年 | 20812篇 |
1978年 | 14821篇 |
1977年 | 12066篇 |
1976年 | 11879篇 |
1975年 | 12115篇 |
1974年 | 14812篇 |
1973年 | 14479篇 |
1972年 | 13362篇 |
1971年 | 12427篇 |
1970年 | 11492篇 |
1969年 | 10414篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Dana Franzen-Klein Mark Jankowski Charlotte L. Roy Hoa Nguyen-Phuc Da Chen Lorin Neuman-Lee 《Journal of toxicology and environmental health. Part A》2020,83(2):45-65
ABSTRACTDomestic chickens (Gallus gallus domesticus) were exposed to imidacloprid by gavage once daily for 7 consecutive days at 0, 0.03, 0.34, 3.42, 10.25, and 15.5 mg/kg/day (n = 20 per group; 5 6-week-old males, 5 6-week-old females, 5 9-week-old males, and 5 9-week-old females). The severity and duration of neurobehavioral abnormalities were recorded. Components of the innate and adaptive immune system were assessed with 7 standard functional assays. Temporary neurobehavioral abnormalities were observed in a dose-dependent manner, including muscle tremors, ataxia, and depressed mentation. Based upon mean clinical severity scores, the no observed adverse effect level (NOAEL) was 3.42 mg/kg/day, and the lowest observed adverse effect level (LOAEL) was 10.25 mg/kg/day. The effective dose value for the presence of any neurobehavioral abnormalities in 50% of the test group (ED50) was 4.62 ± 0.98 mg/kg/day. The ED50 for an adjusted score that included both severity and duration of neurobehavioral abnormalities was 11.24 ± 9.33 mg/kg/day. These ED50 values are equivalent to a 1 kg bird ingesting 29 or 70 imidacloprid treated soybean seeds respectively. Immunotoxicity was not documented, possible causes include the assays were insensitive, relevant immune functions were not examined, or imidacloprid is not immunotoxic at this dosing schedule in this species. Neurobehavioral abnormalities were a more sensitive indicator of the sublethal effects of imidacloprid than immunotoxicity. 相似文献
92.
93.
94.
95.
96.
Eric S. Zhou Larissa Nekhlyudov Sharon L. Bober 《Translational andrology and urology》2015,4(2):218-231
There is a large and growing population of long-term cancer survivors. Primary care physicians (PCPs) are playing an increasingly greater role in the care of these patients across the continuum of cancer survivorship. In this role, PCPs are faced with the responsibility of managing a range of medical and psychosocial late effects of cancer treatment. In particular, the sexual side effects of treatment which are common and have significant impact on quality of life for the cancer survivor, often go unaddressed. This is an area of clinical care and research that has received increasing attention, highlighted by the presentation of this special issue on Cancer and Sexual Health. The aims of this review are 3-fold. First, we seek to overview common presentations of sexual dysfunction related to major cancer diagnoses in order to give the PCP a sense of the medical issues that the survivor may present with. Barriers to communication about sexual health issues between patient/PCPs in order are also described in order to emphasize the importance of PCPs initiating this important conversation. Next, we provide strategies and resources to help guide the PCP in the management of sexual dysfunction in cancer survivors. Finally, we discuss case examples of survivorship sexual health issues and highlight the role that a PCP can play in each of these case examples. 相似文献
97.
98.
99.
F. Giovanardi F. Nudo Q. Lai M. Garofalo A. Consolo E. Choppin De Janvry G.A. Arroyo Murillo P. Ursi D. Stabile F. Melandro P.B. Berloco R. Pretagostini L. Poli 《Transplantation proceedings》2019,51(1):128-131
Background
Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.Methods
During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.Results
No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.Conclusions
The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach. 相似文献100.