全文获取类型
收费全文 | 9081篇 |
免费 | 578篇 |
国内免费 | 182篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 507篇 |
妇产科学 | 1915篇 |
基础医学 | 1527篇 |
口腔科学 | 39篇 |
临床医学 | 1180篇 |
内科学 | 814篇 |
皮肤病学 | 32篇 |
神经病学 | 442篇 |
特种医学 | 148篇 |
外国民族医学 | 1篇 |
外科学 | 304篇 |
综合类 | 1106篇 |
预防医学 | 607篇 |
眼科学 | 47篇 |
药学 | 840篇 |
7篇 | |
中国医学 | 139篇 |
肿瘤学 | 178篇 |
出版年
2024年 | 18篇 |
2023年 | 128篇 |
2022年 | 170篇 |
2021年 | 253篇 |
2020年 | 243篇 |
2019年 | 314篇 |
2018年 | 289篇 |
2017年 | 294篇 |
2016年 | 358篇 |
2015年 | 278篇 |
2014年 | 438篇 |
2013年 | 729篇 |
2012年 | 365篇 |
2011年 | 489篇 |
2010年 | 341篇 |
2009年 | 373篇 |
2008年 | 438篇 |
2007年 | 427篇 |
2006年 | 336篇 |
2005年 | 345篇 |
2004年 | 333篇 |
2003年 | 299篇 |
2002年 | 224篇 |
2001年 | 177篇 |
2000年 | 169篇 |
1999年 | 143篇 |
1998年 | 130篇 |
1997年 | 121篇 |
1996年 | 110篇 |
1995年 | 105篇 |
1994年 | 133篇 |
1993年 | 105篇 |
1992年 | 74篇 |
1991年 | 82篇 |
1990年 | 79篇 |
1989年 | 48篇 |
1988年 | 59篇 |
1987年 | 44篇 |
1986年 | 49篇 |
1985年 | 186篇 |
1984年 | 112篇 |
1983年 | 84篇 |
1982年 | 97篇 |
1981年 | 70篇 |
1980年 | 51篇 |
1979年 | 28篇 |
1978年 | 35篇 |
1977年 | 24篇 |
1976年 | 17篇 |
1973年 | 11篇 |
排序方式: 共有9841条查询结果,搜索用时 11 毫秒
1.
范玲 《中华产科急救电子杂志》2020,9(3):133-135
远程胎儿监护是应用互连网及计算机技术,孕妇在家中或远程监护终端将胎心监护图形传输到中央监护站,医生即可通过电脑或手机APP远程判读。对高危孕妇实行远程监护,便于及时发现胎儿宫内缺氧情况和及时处理,改善围产儿结局。 相似文献
2.
3.
邹清如 《中华现代妇产科学杂志》2005,2(9):789-790
目的探讨第一产程胎心监护异常的相关因素,提示处理措施。方法2004年1月1日。12月31日对我院226例第一产程胎心监护异常的相关因素进行回顾性分析。结果第一产程胎心监护异常为综合因素所致,胎儿高危因素为91.59%,母体高危因素为65.49%,产程处理因素为42.92%。结论第一产程胎心监护异常主要与胎儿因素、母体因素有关,提高产前检查质量、加强产程监护、正确选择分娩方式极为重要。 相似文献
4.
用小鼠胎肝细胞体外血浆凝块培养红系集落(Erythroid colong formig unit inculturc,E-CFUc)方法,以红细胞生成素(Erythropoietin,EPO)850323为标准试剂,测定正常人、贫血病人血清EPO浓度。实验用妊娠13~15d小鼠胎肝细胞。血清均经透析处理,培养液中加量最大不超过10%。EPO(850323)在培养液中浓度为2.5~100mU/ml。血清EPO(mU/ml)测定结果:28例正常人为48.O±17.7,12例再生障碍性贫血病人为946~>10000,1例巨幼细胞性贫血病人为500,1例缺铁性贫血病人为400和18例慢性肾功能衰竭病人则为94.2±87.6。结果表明:贫血病因对血清EPO浓度有影响。 相似文献
5.
建立了小鼠脾脏、胸腺细胞体外转化微量培养系统,确定了最佳实验条件.点蜡法充CO_2,简便易行,效果好.RPMI-1640培养基内补充胎牛血清,其浓度确定为在脾细胞培养为10%,在胸腺细胞培养为20%.脾细胞培养最适细胞密度为2~5×10~6/ml,Con A最适量为2~4μg/培养;胸腺细胞培养细胞最适密度为1×10~7/ml,Con A最适量为2~4μg/培养.两种已知免疫活性的药物在脾细胞培养体系有明确肯定的反应. 相似文献
6.
【摘要】 目的 :探讨羊水粪染与羊膜腔感染的关系。方法 :选择未临产且胎膜完整的剖宫产产妇 5 6例 ,根据术中所见羊水性状分为羊水清亮组、羊水Ⅰ~II度粪染组和羊水III度粪染组。于剖宫产术中取羊水用双抗体夹心ELISA法测IL 6含量 ,取胎盘胎膜做病理检查以了解有无炎性细胞浸润 ,并记录新生儿Apgar评分 ,观察产妇术后有无产褥感染。结果 :3组羊水中IL 6含量差异无显著性 ,3组胎盘标本病理检查示炎性细胞浸润之差异亦无显著性 ,而羊水粪染组新生儿窒息发生率较清亮组明显增加 (P <0 .0 5 )。结论 :羊水粪染尤其是III度粪染是胎儿窘迫的标志 ,而与羊膜腔感染无明显相关性。 相似文献
7.
Objective. The objective of our paper is to show that the spatio-temporal image correlation (STIC) and tomographic ultrasound imaging (TUI) is very convenient and helpful for the fetal screening of complex congenital heart defects (CHD).
Methods. Ultrasound examinations were performed using a Voluson 730 EXPERT or PRO system (GE Medical system, Kretztechnik, Zipf, Austria), and the transabdominal probe (RAB 4-8 MHz or 1-5 MHz) was used to acquire the STIC volumes. Various complex CHD including heterotaxia, ventricular septal defect (VSD), atrio-ventricular septal defect (AVSD), tetralogy of fallot (TOF), transposition of great artery (TGA), hypoplastic left heart syndrome (HLHS) were examined between 20 weeks and 35 weeks. After routine cardiac screening and examination by two-dimensional ultrasound, three- and four-dimensional ultrasound were performed by gray-scaled and color flow mapping. After the examination detailed analysis of CHD were performed by STIC and TUI.
Results. In the case of heterotaxia, STIC and TUI was useful for the detection of stomach and cardiac apex in the different slices. In the case of VSD and AVSD, they were useful for the exact determination of septal defect location. In the cases of TOF, TGA and HLHS, they were helpful for observation of outflow tract and exact diagnosis.
Conclusion. In the screening of complex CHD including heterotaxia, VSD, AVSD, TOF, TGA and HLHS, STIC is very useful and powerful tool. 相似文献
Methods. Ultrasound examinations were performed using a Voluson 730 EXPERT or PRO system (GE Medical system, Kretztechnik, Zipf, Austria), and the transabdominal probe (RAB 4-8 MHz or 1-5 MHz) was used to acquire the STIC volumes. Various complex CHD including heterotaxia, ventricular septal defect (VSD), atrio-ventricular septal defect (AVSD), tetralogy of fallot (TOF), transposition of great artery (TGA), hypoplastic left heart syndrome (HLHS) were examined between 20 weeks and 35 weeks. After routine cardiac screening and examination by two-dimensional ultrasound, three- and four-dimensional ultrasound were performed by gray-scaled and color flow mapping. After the examination detailed analysis of CHD were performed by STIC and TUI.
Results. In the case of heterotaxia, STIC and TUI was useful for the detection of stomach and cardiac apex in the different slices. In the case of VSD and AVSD, they were useful for the exact determination of septal defect location. In the cases of TOF, TGA and HLHS, they were helpful for observation of outflow tract and exact diagnosis.
Conclusion. In the screening of complex CHD including heterotaxia, VSD, AVSD, TOF, TGA and HLHS, STIC is very useful and powerful tool. 相似文献
8.
孕妇血清AFP、uE3和β-hCG水平与严重胎儿缺陷的关系 总被引:3,自引:0,他引:3
①目的 探讨孕中期血清甲胎球蛋白(AFP),游离雌三醇(uF3)和β绒毛膜促性腺激素(β-HCG)水平与严重胎儿缺陷的关系。②方法 用ELISA方法对832例16-21周妊娠妇女血清AFP、UE3和β-hCG进行检测,以筛查阳性病人。③结果 14例胎儿被确诊为异常,其中唐氏综征2例,无脑儿3例,脊柱裂3例,唇腭裂1例,腹裂肠外翻1例,孕中期自然流产2例,死胎1例,葡萄胎1例,总检出率为1.68%,假阳性15例,占被检人数的1.80%。④结论 以上3种生化指标联合检测可作为产前诊断严重胎儿缺陷的有效方法。 相似文献
9.
胎儿主要肢骨发育时间表──超声骨龄 总被引:1,自引:0,他引:1
用B超检测正常妊娠中的胎儿。选择受精龄为12至38整周(completedweek)的胎儿297例。测量其主要肢骨(干)长度。并将所测数据进行统计学处理。结果表明胎儿肢骨的生长发育与胎龄有显著的正相关关系。 相似文献
10.
Milena G. J. Jahoda Helen Brandenburg Titia Cohen-Overbeek Frans J. Los Eva S. Sachs Juriy W. Wladimiroff 《American journal of medical genetics. Part A》1993,46(5):483-485
Data from 4,300 consecutive cases following prenatal diagnosis by transcervical (TC) CVS (n = (1,570) and transabdominal (TA) CVS (n = 2,370) were evaluated. In the follow-up study only infants examined by a physician were included. Gestational age varied between 8.5 and 11.6 weeks (mean 10.3 weeks) for TC-CVS and between 9.3 and 20 weeks (mean 12.3 weeks) for TA-CVS 98% of TC-CVS was performed at 9–10 weeks, 80.7% of TA-CVS procedures were carried out at 12–15 weeks. Selective termination took place in 97 cases of TC-CVS (6.1%) and in 72 cases of TA-CVS (2.6%). Another 8 Women had a termination for psychosocial reasons, resulting in 4,123 (1,469 TC, 2,645 TA) continuing pregnancies. The overall fetal loss rare <28 weeks was 5.4% (n = 80) for TC-CVS and 2.6% (n = 70) for TA-CVS. The overall incidence of congenital abnormalities after birth was 0.9%. Two terminal transversal limb defects were detected in the TC-CVS group (0.14%) against one (0.04%) in the TA-CVS group. © 1993 Wiley-Liss, Inc. 相似文献