首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1840篇
  免费   256篇
  国内免费   60篇
耳鼻咽喉   44篇
儿科学   51篇
妇产科学   25篇
基础医学   199篇
口腔科学   28篇
临床医学   238篇
内科学   385篇
皮肤病学   36篇
神经病学   98篇
特种医学   238篇
外科学   188篇
综合类   127篇
预防医学   76篇
眼科学   30篇
药学   183篇
中国医学   44篇
肿瘤学   166篇
  2024年   3篇
  2023年   24篇
  2022年   47篇
  2021年   78篇
  2020年   63篇
  2019年   116篇
  2018年   96篇
  2017年   89篇
  2016年   68篇
  2015年   67篇
  2014年   109篇
  2013年   96篇
  2012年   104篇
  2011年   91篇
  2010年   81篇
  2009年   67篇
  2008年   72篇
  2007年   84篇
  2006年   62篇
  2005年   43篇
  2004年   44篇
  2003年   43篇
  2002年   35篇
  2001年   38篇
  2000年   35篇
  1999年   14篇
  1998年   38篇
  1997年   50篇
  1996年   33篇
  1995年   31篇
  1994年   25篇
  1993年   17篇
  1992年   21篇
  1991年   13篇
  1990年   18篇
  1989年   28篇
  1988年   28篇
  1987年   21篇
  1986年   21篇
  1985年   24篇
  1984年   14篇
  1983年   14篇
  1982年   17篇
  1981年   10篇
  1980年   18篇
  1979年   7篇
  1978年   7篇
  1977年   10篇
  1976年   14篇
  1975年   5篇
排序方式: 共有2156条查询结果,搜索用时 0 毫秒
1.
Chronicsofttissuelesionisaspeciallymedicalterm,andanimportantpathologicalchangesofdiseases,suchaschronicoveruseinjuriesandconversionofacuteinjuriesinlowbackorfrominter-vertebraldiscprotrusion,anddislocationofintervertebraljointsaswell,whichmainlycauseseverepaininlowback犤1犦.Manypresentmethods(oralmedicine,massage,anestheticblock,physicalthera-piesetc.)havebeenusedforrelievingthepain,whichdemandsagreatfiscalsupportannually.Unfortunately,thereportsonthemechanismsandeffectofthem…  相似文献   
2.
Splenic irradiation has been used in patients with HIV-related thrombocytopenia. This retrospective review deals with four patients treated with low dose splenic irradiation. All patients had an increase in platelet count and tolerated the treatment without side effects. However, the treatment response lasted for several months only.  相似文献   
3.
4.
5.
Summary— In the present study we have compared the steady state biopharmaceutic characteristics of four diltiazem once daily controlled release capsules: Mono-Tildiem LP 300® (300 mg), Adizem® XL (300 mg)1, Cardizem® (300 mg) and Dilacor® (240 mg). Sixteen healthy male volunteers (aged 22.9 ± 3.3 years, range 19–31 years) completed an open label, multiple oral dose, randomized, four-period crossover study without a washout period in between. The volunteers received each diltiazem formulation once daily for four days. Trough diltiazem and metabolites plasma concentrations were determined on days 3 and 4. The 24-h plasma concentration-time profiles were assessed after the dose on day 4 of each period. The following steady state pharmacokinetic parameters for diltiazem were calculated: the minimum plasma concentration (cmin), the maximum plasma concentration (cmax), the time to reach that concentration (tmax), the time interval during which the plasma concentration exceeds 50% of cmax (t50), the area under the plasma concentration-time curve (AUC72–96) and the peak-to-trough fluctuation (PTF). For the metabolites of diltiazem, N-mono-desmethyl-diltiazem (NDM) and desacetyldiltiazem (DAD), AUC72–96 (AUCNDM and AUCDAD) and the ratio metabolite/parent compound were calculated. Steady state was achieved on day 3. Except one, all controlled release formulations have satisfactory controlled release properties allowing once daily administration. However, significant (P < 0.05) differences were found between the pharmacokinetic characteristics which do not allow exchange of the various formulations. Concentrations well below 50 ng·mL-1 in the morning hours were observed for Dilacor® (240 mg) and Adizem® XL (300 mg), which could be a disadvantage of these formulations as it is well-known that ischaemic events occur at a higher rate during that part of the day. The plasma concentration profiles of NDM and DAD, the major circulating metabolites, parallel the plasma concentration profiles for the parent compound. From a clinical point of view, all treatments were well tolerated.  相似文献   
6.
87例肺癌患者核素骨显像结果分析   总被引:3,自引:0,他引:3  
目的:通过对87例肺癌患者放射性核素全身骨显像结果进行分析,探讨肺癌骨转移的特点和规律。方法:回顾性分析了经临床病理证实的87例肺癌患者的全身骨显像表现。结果:肺癌骨转移率为63.2%,发生骨转移最常见的部位为肋骨,其次为脊椎骨、盆骨、四肢骨、肩胛骨、颅骨和胸锁骨。在不同病理类型的肺癌中,腺癌和鳞癌较其它类型更易发生骨转移。结论:肺癌骨转移比较常见,所以肺癌患者应常规作全身核素骨扫描,以帮助临床制订正确的治疗方案。  相似文献   
7.
Intestinal obstruction proximal to a transition zone without an interposed physical barrier usually indicates Hirschsprung disease. The authors report one case of focal small bowel muscular thinning just distal to a transition zone that produced clinical and radiographic findings that simulated long-segment Hirschsprung disease in a 2-day-old infant.  相似文献   
8.
Recently, in-vitro maturation (IVM) of immature human oocytes recovered from non-stimulated follicles has been applied in the treatment of infertility. However, in previous reports, very few embryos cultured in conventional medium have reached the expanded blastocyst stage following in-vitro maturation and fertilization (IVM/IVF). The objective of this study was to investigate whether the developmental competence of human embryos following IVM/IVF could be enhanced by the use of a human ampullary cell co-culture system. Immature human oocytes were aspirated from small follicles at Caesarean section and then cultured in medium containing human menopausal gonadotrophin for 36 to 48 h, followed by insemination. Zygotes were randomly cultured either in conventional culture medium alone or in the co-culture system. Of 48 embryos cultured in conventional medium alone, all arrested at the 2-16- cell stage on day 3 after insemination. Of 46 embryos cultured in the co-culture system, 26 embryos (56.5%) arrested at the 2-16-cell stage. Six embryos (13%) developed to the morula stage. Fourteen embryos (30.4%) developed to expanded blastocysts and two blastocysts were hatching on day 7 after insemination. We conclude that co-culture significantly enhances the development of blastocysts in embryos resulting from IVM/IVF.   相似文献   
9.
10.
Lactate production in isolated perfused rat lung   总被引:1,自引:0,他引:1  
  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号