全文获取类型
收费全文 | 42082篇 |
免费 | 2906篇 |
国内免费 | 171篇 |
专业分类
耳鼻咽喉 | 502篇 |
儿科学 | 1374篇 |
妇产科学 | 561篇 |
基础医学 | 5054篇 |
口腔科学 | 538篇 |
临床医学 | 4348篇 |
内科学 | 9350篇 |
皮肤病学 | 706篇 |
神经病学 | 3951篇 |
特种医学 | 1679篇 |
外科学 | 7286篇 |
综合类 | 391篇 |
一般理论 | 83篇 |
预防医学 | 3166篇 |
眼科学 | 1177篇 |
药学 | 2180篇 |
中国医学 | 39篇 |
肿瘤学 | 2774篇 |
出版年
2024年 | 33篇 |
2023年 | 403篇 |
2022年 | 695篇 |
2021年 | 1581篇 |
2020年 | 788篇 |
2019年 | 1304篇 |
2018年 | 1578篇 |
2017年 | 1080篇 |
2016年 | 1179篇 |
2015年 | 1267篇 |
2014年 | 1768篇 |
2013年 | 2089篇 |
2012年 | 3521篇 |
2011年 | 3505篇 |
2010年 | 1912篇 |
2009年 | 1703篇 |
2008年 | 2841篇 |
2007年 | 2772篇 |
2006年 | 2663篇 |
2005年 | 2520篇 |
2004年 | 2462篇 |
2003年 | 2062篇 |
2002年 | 1904篇 |
2001年 | 252篇 |
2000年 | 180篇 |
1999年 | 254篇 |
1998年 | 365篇 |
1997年 | 315篇 |
1996年 | 239篇 |
1995年 | 224篇 |
1994年 | 171篇 |
1993年 | 169篇 |
1992年 | 118篇 |
1991年 | 123篇 |
1990年 | 84篇 |
1989年 | 80篇 |
1988年 | 55篇 |
1987年 | 69篇 |
1986年 | 69篇 |
1985年 | 65篇 |
1984年 | 79篇 |
1983年 | 85篇 |
1982年 | 103篇 |
1981年 | 77篇 |
1980年 | 53篇 |
1979年 | 28篇 |
1978年 | 32篇 |
1977年 | 34篇 |
1973年 | 22篇 |
1972年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
A literature review of autograft and allograft anterior cruciate ligament reconstruction 总被引:3,自引:0,他引:3
Jonathan Marrale Matthew C. Morrissey Fares S. Haddad 《Knee surgery, sports traumatology, arthroscopy》2007,15(6):690-704
Knee anterior cruciate ligament reconstructive surgery has significantly evolved and now includes the option of using an allograft.
This has resulted in numerous studies evaluating the advantages and disadvantages of allografts. The purpose of this literature
review is to evaluate this research and present important findings to allow the selection of the most appropriate graft source
when considering allograft versus autograft reconstruction. 相似文献
63.
Christopher D Wells Russell I Heigh Virender K Sharma Michael D Crowell Suryakanth R Gurudu Jonathan A Leighton Nora Mattek David E Fleischer 《BMC gastroenterology》2007,7(1):19
Background
Many factors impacting cecal intubation rates have been examined in detail; however, little information exists regarding the effect of the timing of the procedure. We sought to examine any difference in cecal intubation rates between morning and afternoon colonoscopies and identify factors contributing to a discrepancy. 相似文献64.
Jonathan R Grant John S Rhee Frank A Pintar Narayan Yoganandan 《Otolaryngology--head and neck surgery》2007,137(2):195-200
OBJECTIVE: To develop biomechanical variable models for driver skull base injury mechanisms in motor vehicle collisions. STUDY DESIGN: Retrospective database review. METHODS: Biomechanical collision variables and safety restraint data were analyzed for Crash Injury Research and Engineering Network skull base trauma subjects enrolled during the recruitment period between 1996 and 2005. RESULTS: For drivers satisfying inclusion criteria (n = 26), injury resulted from contact with rigid vehicle structural elements in 82%, and occurred in 50% despite both seatbelt and air bags. Eight percent used neither seatbelts nor air bags. Seventy-two percent involved vector velocity changes greater than 30 mph. The relative morbidity of skull base injuries was also detailed. CONCLUSION: The majority of driver skull base injuries resulted from contact with rigid vehicle structural elements in high velocity crashes. Seatbelt and air bag use could not be definitively correlated with skull base injury. CLINICAL SIGNIFICANCE: Injury mechanism models can be developed that facilitate further investigations to determine impact and scope on a national scale. 相似文献
65.
66.
慢性胰腺炎的临床表现包括疼痛、脂肪泻和糖尿病。在西方国家,慢性胰腺炎最常见的病因是酗酒。70%以上的病人在就诊时有疼痛的临床表现,而且,这些患者中又有75%以上会在几年之后出现疼痛减轻或完全消失。对于所有的慢性胰腺炎的病人来说,均应排除非胰源性疼痛和胆道梗阻、胰腺假性囊肿等胰腺局部并发症。应建议所有慢性胰腺炎病人戒烟、戒酒。阿片类镇痛剂仅应用于治疗疼痛严重的病人。尽管有报道认为胰酶替代治疗有助于止痛,但是,对于已经确诊的慢性胰腺炎病人来说,该疗法无效。激素类药物进行腹腔神经丛阻滞术可能有助于病人度过剧烈疼痛期。顽固性疼痛是进行胰液引流或胰腺切除的适应证。建议应用适量胰酶替代联合(或不联合)制酸剂治疗营养不良。慢性胰腺炎导致的糖尿病与原发性糖尿病的治疗原则相似。 相似文献
67.
68.
69.
70.
Michael L. Graham Jonathan J. Shuster Barton A. Kamen David L. Cheo Matthew P. Harrison Brigid G. Leventhal D. Jeanette Pullen V. Michael Whitehead 《Cancer chemotherapy and pharmacology》1992,31(3):217-222
Summary We enrolled children with acute lymphoblastic leukemia (ALL) in a Pediatric Oncology Group (POG) pilot study to monitor erythrocyte (RBC) methotrexate (MTX) and folate (F) levels before and during treatment. The mean value for RBCF at diagnosis was 0.86±0.46 nmol/ml RBC in the 214 patients who achieved remission and 1.21±0.74 nmol/ml RBC in the 10 patients who did not (P=0.020). Folate levels tended to increase during remission induction, but they dropped following an intensive consolidation with methotrexate to levels that were sustained throughout chemotherapy treatment. Methotrexate levels reached mean values of approximately 0.15 nmol/ml RBC at the end of an intensive methotrexate consolidation, then fell to levels that were sustained throughout maintenance therapy. There was a weak correlation between improved event-free survival and higher RBCMTX levels after consolidation, but no correlation was found between improved survival and the level of RBCMTX or RBCF during maintenance therapy. A larger study with more complete data is needed to determine whether RBCMTX or RBCF might be useful in predicting event-free survival in patients with ALL.This work was supported in part by grants from the National Cancer Institute and the National Institute of Health (CA-30969, CA-28476, CA29139, CA-159-89, and CA-33587) 相似文献