首页 | 官方网站   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   8137篇
  免费   777篇
  国内免费   399篇
医药卫生   9313篇
  2024年   11篇
  2023年   100篇
  2022年   177篇
  2021年   363篇
  2020年   240篇
  2019年   276篇
  2018年   316篇
  2017年   262篇
  2016年   263篇
  2015年   358篇
  2014年   401篇
  2013年   446篇
  2012年   550篇
  2011年   613篇
  2010年   369篇
  2009年   274篇
  2008年   432篇
  2007年   451篇
  2006年   484篇
  2005年   436篇
  2004年   278篇
  2003年   294篇
  2002年   212篇
  2001年   181篇
  2000年   175篇
  1999年   195篇
  1998年   134篇
  1997年   118篇
  1996年   87篇
  1995年   80篇
  1994年   68篇
  1993年   39篇
  1992年   100篇
  1991年   59篇
  1990年   68篇
  1989年   34篇
  1988年   53篇
  1987年   47篇
  1986年   39篇
  1985年   35篇
  1984年   20篇
  1983年   17篇
  1982年   13篇
  1981年   20篇
  1980年   11篇
  1979年   21篇
  1976年   15篇
  1973年   9篇
  1969年   7篇
  1965年   6篇
排序方式: 共有9313条查询结果,搜索用时 15 毫秒
81.
BackgroundHepatic artery thrombosis (HAT), a serious complication after orthotopic liver transplantation, almost always leads to morbidity and mortality without urgent revascularization or retransplantation, especially if HAT occurs within a few days after transplantation.Case PresentationHerein we describe a case report of an orthotopic liver transplantation patient surviving without hepatic artery flow due to HAT on postoperative day 1. Reanastomosis, thrombectomy, and intra-arterial thrombolysis were performed, but only retrograde arterial flow by Doppler ultrasound, not by angiography, could be demonstrated in the hepatic artery. This case report is in compliance with the Declaration of Helsinki and the Declaration of Istanbul.ConclusionBased on the evidence from this patient, we believe that patients with failed revascularization can experience a long-term survival with conservative treatment. Retransplantation should be evaluated based on laboratory findings because graft function in individual patients can recover.  相似文献   
82.
Objective: The present study aimed to evaluate the therapeutic effect and explore the underlying mechanisms of Longxue Tongluo Capsule (LTC) on ischemic stroke rats. Methods: Twenty-six rats were randomly divided into four groups, including sham group, sham + LTC group, MCAO group, and MCAO + LTC group. Ischemic stroke rats were simulated by middle cerebral artery occlusion (MCAO), and LTC treatment group were orally administrated with 300 mg/kg of LTC once daily for seven consecutive days. LTC therapy was validated in terms of neurobehavioral abnormality evaluation, cerebral infarct area, and histological assessments. The plasma metabolome comparisons amongst different groups were conducted by UHPLC-Q Exactive MS in combination with subsequent multivariate statistical analysis, aiming to finding the molecules in respond to the surgery or LTC treatment. Results: Intragastric administration of LTC significantly decreased not only the neurobehavioral abnormality scores but also the cerebral infarct area of MCAO rats. The interstitial edema, atrophy, and pyknosis of glial and neuronal cells occurred in the infarcted area, core area, and marginal area of cerebral cortex were improved after LTC treatment. A total of 13 potential biomarkers were observed, and Youden index of 11 biomarkers such as LysoPC, SM, and PE were more than 0.7, which were involved in neuroprotective process. The correlation and pathway analysis showed that LTC was beneficial to ischemic stroke rats via regulating glycerophospholipid and sphingolipid metabolism, together with nicotinate and nicotinamide metabolism. Heatmap and ternary analysis indicated the synergistic effect of carbohydrates and lipids may be induced by flavonoid intake from LTC. Conclusion: The present study could provide evidence that metabolomics, as systematic approach, revealed its capacity to evaluate the holistic efficacy of TCM, and investigate the molecular mechanism underlying the clinical treatment of LTC on ischemic stroke.  相似文献   
83.
84.
Osteoporosis is a major health issue. By 2050, a greater than 2-fold increase in patients number with hip fractures will occur in Asia representing 50% of all hip fractures worldwide. For the Asia-Pacific (AP) region, more efforts on controlling osteoporosis and the subsequent fractures are crucial. Bone mineral density (BMD) by dual energy X-ray absorptiometry (DXA) is commonly used to diagnose osteoporosis and monitor osteoporosis treatment. However, the inconvenience, cost, limited availability of DXA and the delay in detection of BMD changes after treatment initiation support an important role for bone turnover markers (BTMs), as short-term tools to monitor therapy. With regards to low adherence rates of medical treatment of osteoporosis, the experts reached consensus on the use of BTMs for both raising awareness and short-term monitoring of osteoporosis treatment in the AP region. The experts endorse the use of BTMs, especially serum C-terminal telopeptide of type 1 collagen (CTX) and serum procollagen type 1 N propeptide (P1NP), as short-term monitoring tools to help clinicians assess the responses to osteoporosis therapies and appropriately adjust treatment regimens earlier than BMD. Either the absolute values or the degree of change from baseline in BTMs can be used to monitor the potential efficacy of osteoporosis therapies. The use of BTMs can be incorporated in osteoporosis care programs, such as fracture liaison service (FLS), to improve patient adherence and treatment outcomes. Encouraging sufficient reimbursement from health care systems may facilitate widespread use of BTMs in clinical practice in the AP region.  相似文献   
85.
目的:探讨半胱氨酸蛋白酶抑制剂C(Cystatin C)在肾脏功能早期损伤评估中的应用。方法:检测1338例患者Cystatin C、血尿素(Urea)、血肌酐(Scr)和尿微量蛋白(UMP)。结果:Scr在UMP正常和异常组的比较中,P值>0.05;而Cystatin C的P值<0.01。结论:Cystatin C在肾功能早期损伤评估中灵敏度和特异性比Scr高,可作为肾功能早期损伤的标志物。  相似文献   
86.
When treating 25 patients with the non-formed small intestinal fistulas, the use of alvesin "Novy" in the parenteral nutrition contributed to more intensive and effective correction of disorders in the protein and water-electrolyte metabolism as compared to that with the use of protein hydrolysates.  相似文献   
87.
The term of "cloacogenic anal carcinoma", "cloacogenic zone" and "cloacal membrane" have been widely used, but the term of "inflammatory cloacogenic polyp" (ICP) was first applied and published by Lobert PF and Henry DA in 1981. Here we present three cases of ICP to stress its inflammatory property, predilection to invade cloacogenic zone of anus and polypoid shape, and to differentiate it from its related lesions as concise as possible.  相似文献   
88.
冷冻同种异体骨段移植修复股骨近段大块骨缺损   总被引:1,自引:0,他引:1  
为观察大块冷冻同种异体骨移植后免疫功能的改变及预后,对13例恶性骨肿瘤瘤段切除后的骨缺损10.8~19.4cm(平均为14.6cm),分别采用冻冷异体松质骨段移植的髋关节加压融合术(6例)和异体股骨近段半关节移植成形术(7例)修复.10例分别于术前4天及术后14和28天检测其空腹外周血各项免疫学指标,以及术后3、6、9、12、24、48个月进行99mSPECT骨扫描(5例)和X-线片检查(12例),以观察宿主的免疫反应和异体骨愈合情况.结果:①外周血T淋巴细胞亚群(OKT3+,OKT4+,OKT8+)及血清补体(C3,C4)和循环免疫复合物(CiC)手术前后比较无显著性差异(P>0.05).②99mTe SPECT骨扫描显示:术后3~6个月移植的异体骨两端及髓腔内同位素浓集明显低于正常,而异体骨两端所对应的自体骨端同位素浓集明显高于正常,此现象于植入后9个月开始减弱,可达数年.X线片显示:异体骨愈合率为92.3%(12/13),2例移植的异体松质骨段于术后4~6年完全成活替代.以上可见:①冻冷异体骨段移植后宿主的全身免疫机能改变不明显,其反应是以局部炎症为主的细胞免疫过程;②异体骨可做为修复大块骨缺损的良好材料.  相似文献   
89.
喉功能保留的梨状窝癌外科治疗   总被引:25,自引:0,他引:25  
目的 评价喉功能保留梨状窝癌的手术治疗效果。方法 回顾性分析了1974~1994年6月我院初治的44例经保留喉功能手术治疗的梨状窝癌病例,其中T110例T218例,T42例。2例术后放射治疗,42例术前放射治疗,原发灶术式包括:36例梨状窝切除术;8例喉及下咽部分切除术。结果 44例5年生存率为50%,I期为80%,Ⅱ期为71.43%,Ⅲ期为52.9%,Ⅳ期为26.7%,总的局部控制率为81.8%  相似文献   
90.
Quinolin-2-one represents an important and valuable chemical motif that possesses a wide variety of biological activities; however, the anti-influenza activities of quinolin-2-one-containing compounds were rarely reported. Herein, we describe the screening and identification of 3-aryl-quinolin-2-one derivatives as a novel class of antiviral agents. The 3-aryl-quinolinone derivatives were synthesized via an efficient copper-catalyzed reaction cascade that we previously developed. Using this synthetic method, preliminary structure–activity relationships of this scaffold against the influenza A virus infection were systematically explored. The most potent compound 34 displayed IC50 values of 2.14 and 4.88 μM against the replication of H3N2 (A/HK/8/68) and H1N1 (A/WSN/33) strains, respectively, without apparent cytotoxicity on MDCK cells. We further demonstrated that 27 and 34 potently inhibited the plaque formation of the IAV, rendering this scaffold attractive for pursuing novel anti-influenza agents.  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-23

京公网安备 11010802026262号