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   334篇
  免费   17篇
  国内免费   5篇
儿科学   24篇
妇产科学   6篇
基础医学   78篇
临床医学   16篇
内科学   15篇
皮肤病学   2篇
神经病学   3篇
特种医学   14篇
外科学   103篇
综合类   34篇
预防医学   6篇
药学   26篇
中国医学   29篇
  2023年   4篇
  2022年   3篇
  2021年   3篇
  2020年   10篇
  2019年   12篇
  2018年   15篇
  2017年   9篇
  2016年   9篇
  2015年   6篇
  2014年   9篇
  2013年   18篇
  2012年   8篇
  2011年   13篇
  2010年   5篇
  2009年   15篇
  2008年   20篇
  2007年   8篇
  2006年   8篇
  2005年   9篇
  2004年   10篇
  2003年   11篇
  2002年   12篇
  2001年   7篇
  2000年   5篇
  1999年   5篇
  1998年   3篇
  1997年   3篇
  1996年   3篇
  1995年   5篇
  1994年   8篇
  1993年   8篇
  1992年   8篇
  1991年   6篇
  1990年   6篇
  1989年   6篇
  1988年   5篇
  1987年   6篇
  1986年   2篇
  1985年   10篇
  1984年   3篇
  1983年   3篇
  1982年   7篇
  1981年   3篇
  1980年   3篇
  1979年   4篇
  1978年   5篇
  1977年   4篇
  1976年   6篇
  1975年   3篇
  1974年   1篇
排序方式: 共有356条查询结果,搜索用时 203 毫秒
1.
目的:观察中药降糖益肾方合二甲双胍片治疗2型糖尿病的临床疗效.方法:治疗组50例口服降糖益肾方、二甲双胍片.对照组45例口服二甲双胍片.两组均连续用药3个月,监测两组治疗前后空腹及餐后2h血糖(FPG、PG2h)、空腹胰岛素(Fins)血脂(TC、TG)及血液流变学指标变化,并计算胰岛素敏感指数(IAI).结果:治疗组临床症状改善、FPG、PG2h、Fins、TC、TG以及血浆粘比度、红细胞压积、纤维蛋白原与对照组比较明显降低,IAI明显提高(P<0.01、P<0.05).结论:中药降糖益肾方合二甲双胍片治疗2型糖尿病疗效确切.  相似文献   
2.
Two patients with arteriovenous fistulas of the native kidney occurring after needle biopsy were evaluated using duplex and color Doppler ultrasonography. The first patient had a fistula with associated pseudoaneurysm: color Doppler showed the lesion as a small rounded area with whirling flow; spectral analysis allowed recognition of both the afferent artery with low impedance flow and the draining vein with pulsatile, arterialized flow. The second patient had a normal color Doppler study; however, spectral analysis demonstrated signals with low vascular impedance from an intra-parenchymal artery at the lower pole, and a jet of turbulent flow. Following disappearance of clinical findings, such Doppler abnormalities were no longer detectable. When a iatrogenic arteriovenous fistula is considered on clinical grounds, both color and Doppler spectral analysis of waveforms from intra-parenchymal vessels should be performed. Possibly, further advances in color Doppler technology will permit the use of this examination as the first imaging procedure in these clinical situations.Correspondence to: L. E. Derchi  相似文献   
3.
选用昆明种小鼠60只,体重18~24克,随机分成三组,每组20只,雌雄各半。通过饮水染毒。一组正常对照,饮自来水,二组饮30ppm含镉水,三组饮300ppm含镉水,染毒时间三个半月。观察指标:体重增长速度、脏器系数、肝肾中镉含量、重点病理形态学改变(光镜和电镜)。结果,30ppm组小鼠肝肾组织有一定病变,300ppm组小鼠的光镜和电镜的病理形态学改变更为明显。提示,小鼠长期摄入镉可引起一定的损害。  相似文献   
4.
Wilke , W. Lee & Person , A. E. G. 1992. Captopril and time dependent changes in post- to pre-glomerular resistance ratios in remnant kidneys of pre-hypertensive rats. Acta Physiol Scand 144 , 253–261. Received 26 June 1991, accepted 8 October 1991. ISSN 0001–6772. Department of Physiology, Colorado State University, Fort Collins, Colorado, USA and Department of Physiology and Biophysics, University of Lund, Sweden. Micropuncture experiments were performed on intact and remnant kidneys of male Sprague-Dawley rats before and after angiotensin converting enzyme inhibition with captopril (0.5 mg kg-1 iv). Partially nephrectomized rats were studied at 2 and 8 weeks post-surgery before the development of systemic hypertension. At 2 weeks, nephrectomized rats had a numerically higher tubular stop-flow pressure than controls (43 ± 2 mmHg vs. 38 ± 2 mmHg; P = 0.08) and a higher post- to pre-glomerular resistance ratio (Re/Ra) (0.40 ± 0.03 vs. 0.31± 0.03; P = 0.08). At 8 weeks, stop-flow pressure and post- to pre-glomerular resistance ratios were similar in remnant and intact kidneys. Captopril had no effect on stop-flow pressure in 2 week post-surgery nephrectomized rats or either control group, but it increased stop-flow pressure in 8 week post-surgery nephrectomized rats (40 ± 2 to 44 ± 2 mmHg, P= 0.04). This increase in stop-flow pressure was associated with an increase in the post- to pre-glomerular resistance ratio (0.33 ± 0.02–0.42 ±0.02, P = 0.009). Stop-flow pressure was positively correlated with the post- to pre-glomerular resistance ratio in 2-week post-surgery nephrectomized rats and their respective controls when combined (r = 0.89, P= 0.0001) and 8-week post-surgery nephrectomized rats and their respective controls combined (r= 0.78, P = 0.0001). Stop-flow pressure was not significantly correlated with mean arterial pressures or welling-point pressures in these groups. We conclude that stop-flow pressure in remnant kidneys of pre-hypertensive rats is primarily determined by the post- to pre-glomerular resistance ratio, and increases in stop-flow pressure and post- to pre-glomerular resistance ratios in remnant kidneys are transient in the absence of systemic hypertension. The role of the renin-angiotensin system in determining the ratio and stop-flow pressure is dependent on time post-nephrectomy. Captopril-induced increases in stop-flow pressure and post- to pre-glomerular resistance ratio at 8 weeks, suggests that its primary effect at that time is not a preferential post-gIomerular vasodilation subsequent to reductions in intrarenal angiotensin II.  相似文献   
5.
用电解损毁方法损毁Wistar成年雄性大鼠的双侧蓝斑区。结果出现膀胱扩张、尿液潴留和血尿等,膀胱和输尿管尿液有大量红细胞和血红蛋白,膀胱粘膜和肾脏充血.结果表明:损毁双侧蓝斑区后不仅有膀胱出血,还有肾脏出血。这个实验可用作研究“特发性”血尿的动物模型。  相似文献   
6.
o,p-Dichlorodiphenyldichloroethane (o,p-DDD) and Perthane, when added in a concentration of 312 M to homogenate and cytoplasmic fraction of dog adrenals, activate glutathione reductase. In a concentration of 156 M, o,p-DDD and Perthane do not affect glutathione reductase activity of the dog adrenals. When given in vitro, o,p-DDD and Perthane activate glutathione reductase of the guinea pig adrenals. o,p-DDD has no effect on glutathione reductase activity of the cytoplasmic fraction of dog liver and kidney, thus confirming the high specificity of its effect on the adrenal cortex.Laboratory of Pathophysiology, Institute of Endocrinology and Metabolism, Kiev. Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 85, No. 2, pp. 159–161, February, 1978.  相似文献   
7.
Abstract A male infant with bilateral small kidneys associated with both proximal and distal tubular dysfunction, who showed chronic renal failure soon after birth, is reported. He was also noted to have both proximal and distal type of renal tubular acidosis. The small kidneys were thought to be due to renal hypodysplasia associated with bilateral severe vesicoureteral reflux, by radiological findings. An alkalization therapy with chemo-prophylaxis seemed to be of benefit in slowing the progression of renal failure in this case.  相似文献   
8.
张桃英  黎芳 《职业与健康》2006,22(9):661-663
目的研究氢化物发生—原子荧光法测定猪肾中砷的适宜条件。方法试验酸介质和还原剂用量对测定砷的影响;选择仪器的最佳工作条件及氢化物发生条件;试验样品中常见元素对砷测定的干扰情况及消除方法。结果在测定条件下,砷的线性范围为0~200μg/L,相关系数达0.999 3以上;检出限为0.14μg/L,回收率在95.5%~101.0%之间,相对标准差(n=7)小于2.7%。结论该试验选用5.0%HCl为介质;样品测定原子化观察高度8 mm;5%硫脲 5%抗坏血酸混合溶液掩弊干扰效果最好。在该工作条件下测定猪肾中的砷,方法灵敏度高,准确度、精密度好。  相似文献   
9.
目的:考察西红康对实验性糖尿病肾病大鼠肾脏结构和功能的影响。方法32只 Wistar 大鼠(雄性)随机分为模型组、西红康组、糖适平阳性组和正常对照组,每组8只,建立糖尿病肾病大鼠模型,对大鼠进行8周的治疗,检测记录治疗前后大鼠的血糖、体重和尿微量白蛋白,分别采用光学显微镜及透射电镜观察大鼠肾脏的结构变化。结果给药前,各组动物的血糖、体重和尿微量白蛋白中均无统计学差异(P >0.05)。给药8周后,血糖水平、体重和尿微量白蛋白指标,阳性组和西红康组相对于模型组均有统计学差异(P <0.05)。正常组大鼠肾脏肾小球结构完整,肾脏系膜细胞、滤过膜内皮细胞和足细胞均结构正常,模型组大鼠肾小球体积增大,系膜细胞发生中度增生,毛细血管基底膜结构模糊,内皮细胞胞质局部融合,阳性组和西红康组均能不同程度降低肾小球大小,缓解系膜细胞增生,毛细血管基底膜结构更为清晰,内皮细胞胞质融合程度下降。结论西红康可减轻实验性糖尿病肾病大鼠肾脏病理损害,改善肾脏功能。  相似文献   
10.
目的 探讨尿激酶对长时间热缺血(warm ischemia,WI)肾脏的形态和功能恢复的影响.方法 30只家兔按随机数字表法分为3组:假手术、热缺血组(WI组)、热缺血+尿激酶治疗组(WI+UK组).夹闭左侧肾动、静脉90 min模拟热缺血过程,HCA液冷灌注及肾脏血流复灌,模拟自体原位肾移植.比较各组血肌酐(Cr)、肾脏组织病理改变(HE、Masson染色)和免疫组化检测血栓调节蛋白(thrombomodulin,TM).结果 与假手术组比较,WI组和WI+UK组术后Cr水平明显升高(P<0.05),术后35 d Cr水平WI+UK组[(118.99±17.18) μmol/L]明显低于WI组[(165.34±8.38) μmol/L,P<0.01].WI组肾小球内大量微血栓形成,肾小管水肿、坏死;WI+UK组肾小球未见血栓,肾小管未见异常.WI组TM表达明显高于假手术组(P<0.01),WI+ UK组明显低于WI组(P<0.05).结论 热缺血90 min后有明显的微血栓形成,导致肾脏结构破坏及肾功能下降.尿激酶治疗后微血栓溶解,有利于肾脏结构和功能恢复.  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