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   1804篇
  免费   81篇
  国内免费   24篇
耳鼻咽喉   4篇
儿科学   95篇
妇产科学   54篇
基础医学   143篇
口腔科学   12篇
临床医学   252篇
内科学   416篇
皮肤病学   2篇
神经病学   49篇
特种医学   26篇
外科学   139篇
综合类   271篇
预防医学   181篇
眼科学   4篇
药学   160篇
  2篇
中国医学   40篇
肿瘤学   59篇
  2024年   2篇
  2023年   13篇
  2022年   47篇
  2021年   70篇
  2020年   54篇
  2019年   54篇
  2018年   44篇
  2017年   47篇
  2016年   52篇
  2015年   65篇
  2014年   154篇
  2013年   190篇
  2012年   128篇
  2011年   135篇
  2010年   89篇
  2009年   108篇
  2008年   92篇
  2007年   70篇
  2006年   56篇
  2005年   55篇
  2004年   56篇
  2003年   44篇
  2002年   26篇
  2001年   16篇
  2000年   28篇
  1999年   17篇
  1998年   23篇
  1997年   20篇
  1996年   9篇
  1995年   20篇
  1994年   12篇
  1993年   10篇
  1992年   12篇
  1991年   12篇
  1990年   6篇
  1989年   5篇
  1988年   4篇
  1987年   4篇
  1986年   4篇
  1985年   8篇
  1984年   12篇
  1983年   3篇
  1982年   8篇
  1981年   2篇
  1980年   4篇
  1979年   3篇
  1978年   3篇
  1977年   3篇
  1976年   2篇
  1971年   3篇
排序方式: 共有1909条查询结果,搜索用时 31 毫秒
31.
目的 观察针刺督脉组穴治疗血管性认知障碍(vascular cognitive impairment,VCI)的临床疗效。方法 将51例VCI患者随机分为针刺组(25例)和药物组(26)例,针刺组采用针刺督脉穴位神庭、百会、风府、大椎进行治疗,药物组采用口服多奈哌齐进行治疗。观察并比较治疗前后患者血清血红蛋白(hemoglobin, Hgb)水平及中医证候量表、MMSE量表、Hachinski量表、额叶功能评定量表(frontal assessment battery, FAB)评分。结果 两组治疗前Hgb水平比较,差异无统计学意义(P>0.05)。两组治疗后Hgb水平均较治疗前显著升高(P<0.05),且针刺组升高值显著大于药物组(P<0.05)。两组治疗前中医证候评分比较,差异无统计学意义(P>0.05)。两组治疗后中医证候评分均较治疗前显著降低(P<0.05),且针刺组降低值显著大于药物组(P<0.05)。两组治疗前MMSE、Hachinski、FAB评分比较,差异均无统计学意义(P>0.05)。与治疗前比较,两组治疗后MMSE、FAB评分均显著增加(P<0.05),且针刺组增加值显著大于药物组(P<0.05)。与治疗前比较,两组治疗后Hachinski评分显著降低(P<0.05),且针刺组降低值显著大于药物组(P<0.05)。两组疗效分布比较,差异具有统计学意义(P<0.05),针刺组疗效优于药物组。结论 针刺督脉组穴可改善VCI患者认知能力,且疗效优于多奈哌齐。  相似文献   
32.
目的:比较卡贝缩宫素和缩宫素治疗剖宫产高危产妇的效果。方法:选取122例剖宫产高危产妇为研究对象,按照随机数字表法分为观察组与对照组各61例。两组均行剖宫产手术,胎儿娩出后,对照组给予缩宫素治疗,观察组给予卡贝缩宫素治疗,比较两组术中、产后2、24 h出血量,产后加用前列素氨丁三醇率,凝血功能指标[纤维蛋白原(FIB)、D-二聚体(D-D)、凝血酶原时间(PT)、部分凝血活酶时间(APTT)]水平,心率,血压,血红蛋白水平和不良反应发生率。结果:观察组术中、产后2、24 h出血量均低于对照组,差异有统计学意义(P<0.05);观察组加用卡前列素氨丁三醇率为4.92%(3/61),明显低于对照组的16.39%(10/61),差异有统计学意义(P<0.05);术后,两组FIB、D-D水平均高于术前,且观察组高于对照组,两组PT、APTT均短于术前,且观察组短于对照组,差异有统计学意义(P<0.05);术后,两组血红蛋白水平均低于术前,但观察组高于对照组,差异有统计学意义(P<0.05);手术前后,两组心率、血压和不良反应发生率比较,差异均无统计学意义(P>0.05)。结论:卡贝缩宫素治疗剖宫产高危产妇可减少出血量和加用卡前列素氨丁三醇率,提高其术后血红蛋白水平,以及改善凝血功能指标,效果优于缩宫素。  相似文献   
33.
BackgroundGlycosylated hemoglobin A1 c (HbA1 c) has been described as a risk factor for adverse outcome after cardiovascular and colorectal surgery, but not for obese patients undergoing bariatric surgery. The objective of this study was to see if there is an association between HbA1 c and adverse outcome in laparoscopic gastric bypass surgery.MethodsFrom the Scandinavian Obesity Surgery Registry we identified 12,850 patients, without treatment for diabetes and operated with laparoscopic gastric bypass between January 1, 2010 and September 30, 2012, and where a baseline HbA1 c value was registered. Preoperative data were compared with data from a 30-day follow-up. Severe complications were defined according to the Clavien-Dindo-Scale as Grade 3 b or higher.ResultsHbA1 c levels below 5.7 % were associated with a lower incidence of severe complications (2.7 %) than higher levels (HbA1 c 5.7–6.49% incidence 3.5%, P = .015; HbA1 c>6.5%, incidence 4.5%, P = .012). After multivariate analysis with patient-specific confounders the difference remained significant (HbA1 c 5.7–6.49% adjusted P = .046; HbA1 c>6.5% adjusted P = .023)ConclusionElevated HbA1 c levels in patients without pharmacologic treatment for diabetes undergoing laparoscopic gastric bypass surgery is associated with an increased risk for severe complications during the first 30 postoperative days. This is the case, even at levels not regarded as diagnostic for diabetes.  相似文献   
34.
AimsMulberry leaves have been used anecdotally in Asia to treat many disease states, including glucose abnormalities. Animal and human studies illustrate potential benefit of mulberry leaf extract (MLE) in type 2 diabetes mellitus (DM2). The purpose of this study is to evaluate the glycemic and safety effects of MLE in patients with DM2.Materials & methodsThis randomized, double-blind, placebo-controlled pilot study evaluated MLE (1000 mg standardized) versus matching placebo given three times daily with meals. Patients (n = 24) were included if they had DM2 on single or combination oral therapy with a stable hemoglobin A1C (A1C). A 2-week placebo run-in (baseline) was followed by initiation of randomized medication for 3 months. Primary endpoints were change in A1C and self-monitoring blood glucoses (SMBG). Safety was also evaluated.ResultsOf 24 patients enrolled, 17 patients completed the study. Post-prandial SMBG was significantly decreased at 3 months in the MLE group versus baseline (16.1%; p < 0.05). This improvement in post-prandial SMBG persisted when compared to placebo (18.2%; p < 0.05). A1C decreased from 7.30% at baseline to 6.94% in the MLE group but did not reach statistical significance (p = 0.079). There was no difference in A1C between MLE and placebo. A significant 15% increase occurred in serum creatinine when the MLE group was compared to baseline or placebo (p < 0.05 for both). There was no significant effect on weight, fasting SMBG, blood pressure, hypoglycemia, or other safety evaluation markers.ConclusionsThese results suggest that mulberry leaf extract may be a useful complementary mealtime glucose option for patients with DM2.ClinicalTrials.gov Identifier NCT00795704.  相似文献   
35.
36.
We present a case of a novel pathogenic variant, Hb Kalavasos [α91(FG3)Leu→His (α2); HBA2: c.275T?>?A; p.Leu92His (NM_000517.4)]; this codon was previously numbered 91 on the α2-globin gene that was discovered following routine Hb A1c testing on a 65-year-old female of Cypriot origin. The band, seen by high performance liquid chromatography (HPLC) but not capillary zone electrophoresis (CZE), was confirmed as a hitherto undescribed a chain variant, that we have named Hb Kalavasos for the Cypriot village of family origin of the proband.  相似文献   
37.
Secondary to the detection of a chronic anemia with a slightly increased Hb F level in a 7‐year-old boy carrying a hemoglobin (Hb) variant, we investigated the members of his family and found that they were related to the original case of Hb Calais. In the present study, we report the clinical and biological impacts of this Hb variant in various members of three generations of this family.  相似文献   
38.
The American Diabetes Association (ADA) 2013 guidelines state that a reasonable hemoglobin A1c goal for many nonpregnant adults with diabetes is less than 7.0% a hemoglobin A1c level of less than 6.5% may be considered in adults with short duration of diabetes, long life expectancy, and no significant cardiovascular disease if this can be achieved without significant hypoglycemia or other adverse effects of treatment. A hemoglobin A1c level less than 8.0% may be appropriate for patients with a history of severe hypoglycemia, limited life expectancy, advanced macrovascular and microvascular complications, extensive comorbidities, and long-standing diabetes in whom the hemoglobin A1c goal is difficult to attain despite multiple glucoselowering drugs including insulin. The ADA 2013 guidelines recommend that the systolic blood pressure in most diabetics with hypertension should be reduced to less than 140 mmHg. These guidelines also recommend use of an angiotensin-converting enzyme inhibitor or angiotensin receptor blocker in the treatment of hypertension in diabetics unless they are pregnant. Diabetics at high risk for cardiovascular events should have theirserum low-density lipoprotein (LDL) cholesterol lowered to less than 70 mg/dL with statins. Lower-risk diabetics should have their serum LDL cholesterol reduced to less than 100 mg/dL. Combination therapy of a statin with either a fibrate or niacin has not been shown to provide additional cardiovascular benefit above statin therapy alone and is not recommended. Hypertriglyceridemia should be treated with dietary and lifestyle changes. Severe hypertriglyceridemia should be treated with drug therapy to reduce the risk of acute pancreatitis.  相似文献   
39.
Of the 1570 reported hemoglobin (Hb) variants detected to date, 390 are α2-globin chain (some variants have yet to be identified by DNA analyses and are therefore presumed) and 827 are the result of mutations of the β-globin chain. Due to their location on the Hb structure, only a minority of these variants result in a clinical phenotype; most are silent and are detected during routine surveillance, are found incidentally during other disease-related investigations or following newborn screening programs. In this report we discuss phenotype/genotype and molecular characteristics of two new Hb variants, both of which were clinically silent. One is an α2-globin chain variant located at codon 3 [α3(A1)Ser→Tyr; HBA2: c.11C?>?A] named Hb Tallahassee and the other is a β-globin chain variant located at codon 119 [β119(GH2)Gly→Ser; HBB: c.358G?>?A] called Hb Madison-NC.  相似文献   
40.
《Hemoglobin》2013,37(4):402-405
Hb Constant Spring [(Hb CS) α142, Term→Gln (TAA>CAA in α2)] and Hb Koya Dora [α142, Term→Ser (TAA>TCA in α2)] both involve mutations of the α2 gene stop codon and while Hb CS is the most frequent cause of nondeletional α-thalassemia (α-thal) in Southeast Asia, Hb Koya Dora is limited to a restricted population from Andhra Pradesh, India. Here we identify a homozygous case of Hb Koya Dora and confirm the structure of the 31 residue α chain extension.  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