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   1895篇
  免费   48篇
  国内免费   4篇
儿科学   18篇
妇产科学   591篇
基础医学   178篇
口腔科学   1篇
临床医学   106篇
内科学   70篇
皮肤病学   16篇
神经病学   16篇
特种医学   3篇
外科学   105篇
综合类   112篇
一般理论   2篇
预防医学   596篇
眼科学   3篇
药学   112篇
  2篇
中国医学   9篇
肿瘤学   7篇
  2023年   26篇
  2022年   17篇
  2021年   40篇
  2020年   52篇
  2019年   94篇
  2018年   69篇
  2017年   69篇
  2016年   62篇
  2015年   39篇
  2014年   98篇
  2013年   218篇
  2012年   34篇
  2011年   86篇
  2010年   79篇
  2009年   75篇
  2008年   84篇
  2007年   89篇
  2006年   99篇
  2005年   70篇
  2004年   68篇
  2003年   77篇
  2002年   72篇
  2001年   45篇
  2000年   42篇
  1999年   36篇
  1998年   23篇
  1997年   19篇
  1996年   17篇
  1995年   18篇
  1994年   16篇
  1993年   21篇
  1992年   6篇
  1991年   11篇
  1990年   4篇
  1989年   4篇
  1988年   5篇
  1987年   8篇
  1986年   4篇
  1985年   9篇
  1984年   11篇
  1983年   6篇
  1982年   3篇
  1981年   2篇
  1980年   5篇
  1979年   5篇
  1978年   4篇
  1975年   1篇
  1974年   1篇
  1973年   1篇
  1972年   1篇
排序方式: 共有1947条查询结果,搜索用时 250 毫秒
1.
ObjectiveClinical specialty societies recommend long-acting reversible contraceptives (LARCs) as first-line contraception for adolescent women. We evaluated whether a combined educational and process improvement intervention enhanced LARC placement in primary care within an integrated health care system.MethodsThe intervention included journal clubs, live continuing education, point-of-care guidelines, and new patient materials. We conducted a retrospective cohort study across 3 time periods: baseline (January 2013?September 2015), early implementation (October 2015–March 2016), and full implementation (April 2016–June 2017). The primary outcome was the proportion of LARCs placed by primary care clinicians among women aged 13 to 18 years compared with gynecology clinicians.ResultsKaiser Foundation Health Plan of Colorado cared for approximately 20,000 women aged 13 to 18 years in each calendar quarter between 2013 and 2017. Overall, LARC placement increased from 7.0 per 1000 members per quarter at baseline to 13.0 per 1000 during the full intervention. Primary care clinicians placed 6.2% of all LARCs in 2013, increasing to 32.1% by 2017 (P < .001), including 45.5% of contraceptive implants. Clinicians who attended educational sessions were more likely to adopt LARCs than those who did not (17.9% vs 6.4% respectively, P = .009). Neither overall LARC placement rates (relative risk, 1.9; 95% confidence interval, 0.7?5.6) nor contraceptive implant rates (relative risk, 3.0; 95% confidence interval, 0.9?9.8) increased significantly in clinicians who attended educational activities.ConclusionsThis multimodal intervention was associated with increased LARC placement for adolescent women in primary care. The combination of education and process improvement is a promising strategy to promote clinician behavior change.  相似文献   
2.
Preventing unintended pregnancies through access to modern family planning could avert 20-35% of maternal deaths, saving the lives of more than 100,000 women each year. Obstacles to wider access still exist, but they may be overcome by overt policy commitment to reproductive health services, partnership between stakeholders, community involvement and quality programs.  相似文献   
3.
Six months after a Comprehensive Abortion Care project was implemented in Phu-San Hospital, the main maternity hospital in Hai Phòng, northern Viet Nam, a study of quality of abortion services was carried out. The study explored the interaction between providers and women seeking abortion and how cultural values influenced quality of care. A quantitative and qualitative approach was employed: a three-part structured survey with 748 women before and after they had an abortion, 20 in-depth interviews with women just after abortion, seven informal interviews with health care staff and 100 participant observations. Both the women and the staff equated quality of care mainly with improved technical performance of abortion. Insufficient knowledge and skills had a negative impact on provision of information and good quality counselling in relation to understanding and uptake of contraception, treating reproductive tract infection and preventing post-abortion infection. To further improve abortion care in hospitals such as Phu-San, training programmes are needed that integrate counselling and clinical skills and address the cultural factors that hinder health staff and women from interacting in an equitable manner. A supportive supervisory system that holds health staff accountable for conducting high quality information and counselling sessions should also be established.  相似文献   
4.
Stewart J. Tepper  MD 《Headache》2006,46(S2):S62-S69
Many women report an increased frequency of headaches around the time of menses. For some women, these headaches are more severe, of longer duration, and lead to greater disability than those occurring at other times in the menstrual cycle. A headache diary is critical to properly diagnose menstrual migraine (MM) by prospectively documenting headache days, severity of headache, and the headaches' relationship to menses. In women with diagnosed MM, acute treatment has been proven to be effective in randomized clinical trials. For those women who have predictable periods and may require preventive therapy, short-term prevention is a reasonable approach due to the predictability of MM. Although several agents (eg, naproxen sodium, magnesium, triptans) have been evaluated for prevention of MM, all but triptans have been assessed in small trials of between 20 and 35 women. Naratriptan, frovatriptan, and, most recently, zolmitriptan have been proven effective in preventing MM. Triptans are generally well tolerated, and the long-term safety of these agents is currently being evaluated. The flexibility of using acute and preventive therapy allows physicians to tailor treatment of MM and meet the needs of individual patients.  相似文献   
5.
A cytomorphometric analysis of superficial vaginal cells inwomen in three groups of different types of hormonal concentrationwas made. There were 15 women in each group. Group I was studiedduring a natural cycle, group II under oral contraceptive therapyand group III during an in-vitro fertilization (IVF) stimulationprotocol. Morphometric parameters were measured on an imageanalyser. The area, perimeter and several form factors weremeasured separately for nuclei and cytoplasm. The nucleus:cytoplasmicratio was also determined. The cytoplasmic area was significantlyreduced in group II and was associated with a statisticallysignificant reduction of the nuclear area. The nucleus:cytoplasmicratio appeared significantly increased in group II and reducedin group III. Low oestradiol impregnation obtained with an oralminidosed contraceptive interfered with vaginal cell maturation.High oestradiol concentrations obtained during IVF protocolsinduced marked nuclear pycnosis but did not induce supra-physiologicalcell enlargement. Maximal cell size is genetically regulatedaccording to Driesch's law of volume invariance and hormonalover-stimulation has no effect on cell size. The nucleus:cytoplasmicratio appears to be a powerful parameter reflecting the oppositeeffects of hormones on cell compartments.  相似文献   
6.
多价精子抗原表位肽的设计与免疫效应研究   总被引:2,自引:2,他引:0  
目的 开发可供两性使用的多价合成嵌合肽疫苗。方法 选择小鼠精子/睾丸特异性抗原SP17、Cyritestin中特异性氨基酸序列与牛核糖核酸酶非限制性T细胞表位作为骨架,按一定连接方式设计、合成新抗原35肽,并与弗氏佐剂混悬后免疫雌性BALB/C小鼠。结果 在430A固相自动肽合成仪上成功地合成35肽,并经HPLC纯化、质谱鉴定证实其纯度达95%以上;免疫后小鼠血清特异性IgG抗体滴度最高达1:6000,阴道粘膜冲洗液中特异性IgA抗体滴度最高达1:300;小鼠脾脏淋巴细胞增殖率达50%左右,淋巴细胞分泌的INF-γ和IL-4分别为60、108μg/ml;实验组BALB/c雌鼠妊娠率平均降至60%,每胎产仔数平均降低58%-71%。结论 含有两种特异性精子抗原中特异性氨基酸序列的新抗原可激发小鼠产生较理想的特异性体液免疫和粘膜免疫,并使小鼠受孕率下降,为研制适宜于两性的多价抗生育疫苗提供了实验基础。  相似文献   
7.
男性激素避孕临床研究的某些进展   总被引:4,自引:2,他引:2  
随着社会的发展 ,迫切需要研制可供男性选用、安全高效、可复性和可接受性均好的避孕药。男性激素类避孕是当今最有前途的方法之一 ,其基本原理是通过外源性激素来抑制垂体促性腺激素和睾丸内睾酮的合成与分泌 ,进而抑制精子发生 ;同时给予的外源雄激素维持男性性征和性功能。研究中的男性激素避孕方法 ,包括单用雄激素、雄激素与孕激素合用、GnRH类似物与雄激素合用、激素相关的免疫途径等 ,寻求更长效、使用更方便、副作用小的雄激素制剂也是当今研究的重点之一  相似文献   
8.
岳焕勋  刘小章  张志红  李顺强 《四川医学》2004,25(11):1194-1195
目的 对使用新型聚氨酯(Pu)男用避孕套的可行性和可接受性进行初步观察。方法 对30对健康已婚夫妇为期6周360次使用国产PU避孕套的效果进行问卷调查。结果 避孕套总破裂率(临床破裂 非临床破裂)为2.22%,临床滑脱率为16.5%,使用观察期间无意外妊娠发生。结论 新型PU避孕套的破裂率和滑脱率分别相近于和高于报道的乳胶避孕套使用情况,感官指标反映PU避孕套具有良好的可接受性。  相似文献   
9.
10.
A preliminary assessment of the contraceptive efficacy of a daily mild increase (1–2°c) in testicular temperature during waking hours is reported in nine couples using two techniques of non-surgical fixation of the testes close to the inguinal canal. With technique 1, immobilization was achieved by passing the penis and the empty scrotum through a hole made in close-fitting underwear; there was one pregnancy, hm a man who stopped the heating after 7 weeks, for 42 cycles of exposure in three couples. With technique 2, immobilization was achieved by adding a ring of soft material surrounding the hole in the underwear; there was no pregnancy for 117 cycles of exposure in six couples. Reversibility and safety were assessed. These preliminary results suggest that a daily mild increase in testicular temperature could be a potential contraceptive method for men.  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