全文获取类型
收费全文 | 22459篇 |
免费 | 2766篇 |
国内免费 | 459篇 |
专业分类
耳鼻咽喉 | 131篇 |
儿科学 | 791篇 |
妇产科学 | 385篇 |
基础医学 | 1709篇 |
口腔科学 | 209篇 |
临床医学 | 2510篇 |
内科学 | 5634篇 |
皮肤病学 | 348篇 |
神经病学 | 1547篇 |
特种医学 | 369篇 |
外科学 | 2256篇 |
综合类 | 1747篇 |
现状与发展 | 1篇 |
一般理论 | 5篇 |
预防医学 | 5069篇 |
眼科学 | 777篇 |
药学 | 937篇 |
3篇 | |
中国医学 | 226篇 |
肿瘤学 | 1030篇 |
出版年
2024年 | 56篇 |
2023年 | 443篇 |
2022年 | 264篇 |
2021年 | 472篇 |
2020年 | 444篇 |
2019年 | 215篇 |
2018年 | 779篇 |
2017年 | 774篇 |
2016年 | 833篇 |
2015年 | 804篇 |
2014年 | 743篇 |
2013年 | 998篇 |
2012年 | 1263篇 |
2011年 | 2041篇 |
2010年 | 1238篇 |
2009年 | 1021篇 |
2008年 | 1151篇 |
2007年 | 1155篇 |
2006年 | 965篇 |
2005年 | 1089篇 |
2004年 | 1884篇 |
2003年 | 1677篇 |
2002年 | 1208篇 |
2001年 | 945篇 |
2000年 | 504篇 |
1999年 | 476篇 |
1998年 | 412篇 |
1997年 | 343篇 |
1996年 | 162篇 |
1995年 | 119篇 |
1994年 | 112篇 |
1993年 | 143篇 |
1992年 | 125篇 |
1991年 | 87篇 |
1990年 | 87篇 |
1989年 | 73篇 |
1988年 | 63篇 |
1987年 | 53篇 |
1986年 | 46篇 |
1985年 | 32篇 |
1984年 | 24篇 |
1983年 | 19篇 |
1982年 | 20篇 |
1981年 | 22篇 |
1980年 | 14篇 |
1977年 | 13篇 |
1975年 | 13篇 |
1974年 | 18篇 |
1968年 | 17篇 |
1928年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
颈动脉切除术的临床研究 总被引:2,自引:0,他引:2
目的 探讨颈部恶性肿瘤侵犯颈总动脉和I或颈内动脉以及颌面部难控制大出血时对颈总动脉和颈内动脉的外科处理方法及其并发症、后遗症的预防。方法 回顾性分析1990年-2000年行颈总或I和颈内动脉结扎、切除术的6例临床资料。结果 本组均为男性,年龄17-66岁。其中颈部复发性转移癌浸润颈总动脉、颈内动脉3例,鼻咽癌放疗后颈部溃疡侵犯颈总动脉1例,上颌骨中央性血管瘤大出血1例,鼻咽纤维轿管瘤术中、术后大出血1例。单纯结扎、切除颈总动脉4例,颈总及颈内动脉同时结扎、切除2例。经随访,术后短暂性肢体偏瘫2例,脑梗塞、永久性偏瘫1例,无任何并发症3例。无手术死亡病例。结论 颈动脉切除术对已累及颈动脉的颈部恶性肿瘤是一种有效的治疗手段,对于颌面颈难以控制的致命性大出血是一种有效的急救措施。单纯切除颈总动脉所产生的术后并发症的发生率比颈总动脉和颈内动脉同时切除低;而已先期或同时切除颈外动脉,出现并发症的机会更大。术后酌用抗凝或溶栓药物对于脑血栓、脑梗塞的防治作用有待进一步研究。 相似文献
42.
43.
44.
病案质量整体管理的做法 总被引:3,自引:0,他引:3
病案质量是衡量临床工作质量的重要标志。目前,因重效益轻质量、重科研轻临床现象突出,致病案质量有所下降。因此,应加强病案质量整体管理,建立医院、科室、个人三级病案质量控制体系;以病案内涵质量为核心内容,制定完善科学的病案质量评价标准;加强岗前培训,抓人员素质的提高;强化病案过程质量管理和终末质量管理,重视病案质量信息反馈作用。 相似文献
45.
F. Horak Jr S. Matthews† G. Ihorst‡ S. H. Arshad† T. Frischer J. Kuehr‡ A. Schwieger‡ J. Forster‡ the SPACE study group 《Clinical and experimental allergy》2004,34(8):1220-1225
BACKGROUND: Sensitization to house dust mite (HDM) is an important risk factor for the development of asthma and allergic disease in childhood. Higher levels of HDM allergen are linked to increased sensitization to HDM. OBJECTIVE: To study the effect of mite-impermeable mattress encasings and an educational package on the development of allergies in a newborn cohort. METHODS: Six hundred and ninety-six newborns at high risk of developing allergies were enrolled in three European countries (Germany, Austria, UK) in a prospective, randomized, controlled birth-cohort study. Children were randomly assigned to an intervention and control group. Intervention measures included the use of mite-impermeable mattress encasings for the child's bed and a simple educational package on allergen avoidance. The control group received basic information about allergies. Children were followed up at age 6, 12, 18 and 24 months. RESULTS: 80.9% of the children were followed up to the age of 24 months. No difference in the prevalence of sensitization to HDM (control vs. intervention group: 8.4% vs. 6.1%, P=0.33) or the development of symptoms (recurrent wheezing 10.3% vs. 10.7%, nocturnal cough 12.5% vs. 12.5%) or allergic diseases (asthma 3.5% vs. 5.1%, eczema 20.0% vs. 19.6%, rhinitis 28.9% vs. 25.8%) could be found between the control and intervention group. CONCLUSION: In this study, HDM avoidance did not show a protective effect on the development of sensitization to HDM or symptomatic allergy in children at age 24 months. 相似文献
46.
常规医疗设备招标存在问题的思考和对策--决策学多属性效用理论的实践探索 总被引:1,自引:0,他引:1
通过对常规医疗设备招标存在问题的思考,采用决策学多属性效用理论作为一种对策方法,并在实际操作中进行了尝试探索,以取得更好的效果. 相似文献
47.
S. Caillard C. Lelong F. Pessione B. Moulin for the French PTLD Working Group 《American journal of transplantation》2006,6(11):2735-2742
Post-transplant lymphoproliferative disorders (PTLD) are a rare but serious complication after organ transplantation. A French Registry of PTLD was set up in a nationwide population of kidney transplant recipients. We prospectively enrolled all adult kidney recipients developing PTLD between January 1, 1998, and December 31, 2003. We analyzed the incidence, risk and prognostic factors of PTLD by Kaplan-Meier and Cox analyses. Totally 230 cases of PTLD were referred to the French Registry. Cumulative incidence was 1.18% after 5 years. Older age (per year, AHR = 2.19, CI = 1.22-3.94) and recipient Epstein-Barr virus seronegativity (AHR = 3.01, CI = 1.57-5.08) were associated with an increased risk of PTLD. Patients with PTLD had a reduced survival rate (61% at 5 years). Graft PTLD had the best prognosis with an 81% survival rate after 5 years. Infection with hepatitis C or B virus (HCV or HBV), late-onset PTLD, multiple sites involvement and high Ann Arbor staging were risk factors for patient death. Use of azathioprine was associated with a poorer survival rate. PTLD incidence and risk factors in French recipients are in line with the international or American PTLD series. We highlighted the role of HBV or HCV in patient mortality and described the relevant prognosis factors for patients with post-transplant lymphoproliferations. 相似文献
48.
应用不经胸食管钝性剥离拔脱术治疗26例咽下癌与高位食管癌,效果良好,术后5例发生开发症,其中颈部吻合口痿3例,暂时性咳呛1例,腹部切口局限裂开1例。手术死亡率7.6%(2/26)。介绍了手术方法,对不经胸施术、胃体缝缩、颈部食管胃Gambee氏吻合法应用进行了讨论。 相似文献
49.
Recommendations for the Conduct of Acute Inhalation Limit Tests 总被引:1,自引:0,他引:1
Prepared by the Technical Committee of the Inhalation Specialty Section Society of Toxicology 《Toxicological sciences》1992,18(3):321-327
This paper reviews the scientific issues related to exposureconcentrations and particle sizes used in acute inhalation limittests. The current United States Environmental Protection Agency(USEPA) recommended exposure concentration for such tests is5 mg/liter, while this level is very high, it is often achievable.On the other hand, its toxicological relevance is questionable.The USEPA recommendation that 25% of the particle distributionbe less than 1 µm is a more difficult issue to address.Physical laws for aerosol particle generation and behavior limitthe minimum size of particles in an exposure atmosphere at aconcentration of 5 mg/liter. Particle size also influences depositionsite in the respiratory tract. Since damage to any region ofthe respiratory tract can produce lethality, and it is not possibleto predict, a priori, the most responsive region of the tractor the most harmful particle size of an untested agent, acutelimit testing should employ particles in a size range that depositsthroughout the entire rodent respiratory tract. Particles between1 and 4 µm mass median aerodynamic diameter (MMAD) arewell suited for such studies. It is, therefore, recommendedthat the limit test concentration should be the highest concentration(up to 5 mg/liter) that can be achieved while still maintaininga particle size distribution having an MMAD between 1 and 4µm. 相似文献
50.
用心肌细胞跨膜电位记录,证实高浓度Ba~■(4mol/L)可诱发豚鼠心室肌自发电活性,这种自发电活性主要来自延迟后除极电位(DAD)及触发活动,且可被维拉帕米(异搏定)阻断,提示DAD的产生与钙离子内流有关。 相似文献