全文获取类型
收费全文 | 333篇 |
免费 | 27篇 |
国内免费 | 1篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 7篇 |
妇产科学 | 3篇 |
基础医学 | 35篇 |
口腔科学 | 1篇 |
临床医学 | 83篇 |
内科学 | 70篇 |
皮肤病学 | 2篇 |
神经病学 | 29篇 |
特种医学 | 12篇 |
外国民族医学 | 1篇 |
外科学 | 13篇 |
综合类 | 2篇 |
预防医学 | 44篇 |
眼科学 | 7篇 |
药学 | 16篇 |
肿瘤学 | 28篇 |
出版年
2023年 | 5篇 |
2022年 | 1篇 |
2021年 | 15篇 |
2020年 | 6篇 |
2019年 | 10篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 12篇 |
2015年 | 8篇 |
2014年 | 8篇 |
2013年 | 18篇 |
2012年 | 18篇 |
2011年 | 20篇 |
2010年 | 8篇 |
2009年 | 14篇 |
2008年 | 21篇 |
2007年 | 25篇 |
2006年 | 22篇 |
2005年 | 17篇 |
2004年 | 18篇 |
2003年 | 16篇 |
2002年 | 15篇 |
2001年 | 2篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1969年 | 3篇 |
排序方式: 共有361条查询结果,搜索用时 15 毫秒
1.
Two findings that may revolutionize the implementation of oral iron supplementation programs worldwide have recently come to light. The first is that weekly administration of oral iron to anemic Chinese preschool children improved iron status as much as daily dosing, producing only negligible side effects. The relevance of this finding is being examined in studies of pregnant women, adolescent girls, and preschoolers in eight countries in the WHO (World Health Organization)–UNU (United Nations University)–UNICEF study of weekly iron supplements. Hopefully, this phenomenon will vastly increase the coverage, feasibility, and effectiveness of supplementation programs, particularly in the developing world. The second finding, that daily oral iron given to iron-sufficient Indonesian toddlers appeared to decrease weight gain compared with a placebo group, had not been apparent in three other small studies. If verified, screening for anemia could be required for all young children in predominantly anemic populations before iron supplements are given. However, it may not be an issue if weekly dosing is adopted. 相似文献
2.
Deatly AM Coleman JW McMullen G McAuliffe JM Jayarama V Cupo A Crowley JC McWilliams T Taffs RE 《Virology》1999,255(2):221-227
Mice transgenic with the human poliovirus receptor gene develop clinical signs and neuropathology similar to those of human poliomyelitis when neurovirulent polioviruses are inoculated into the central nervous system (CNS). Factors contributing to disease severity and the frequencies of paralysis and mortality include the poliovirus strain, dose, and gender of the mouse inoculated. The more neurovirulent the virus, as defined by monkey challenge results, the higher the rate of paralysis, mortality, and severity of disease. Also, the time to disease onset is shorter for more neurovirulent viruses. Male mice are more susceptible to polioviruses than females. TGM-PRG-3 mice have a 10-fold higher transgene copy number and produce 3-fold more receptor RNA and protein levels in the CNS than TGM-PRG-1 mice. CNS inoculations with type III polioviruses differing in relative neurovirulence show that these mouse lines are similar in disease frequency and severity, demonstrating that differences in receptor gene dosage and concomitant receptor abundance do not affect susceptibility to infection. However, there is a difference in the rate of accumulation of clinical signs. The time to onset of disease is shorter for TGM-PRG-3 than TGM-PRG-1 mice. Thus, receptor dosage affects the rate of appearance of poliomyelitis in these mice. 相似文献
3.
4.
5.
6.
7.
This study examined the effect of gender on symptom evaluation, symptom response, and physical functioning following coronary artery bypass graft surgery. Symptom evaluation and symptom response were measured at baseline and 2, 4, and 6 weeks and 3 months following surgery, and physical functioning was measured at baseline, 6 weeks, and 3 months. The sample included 46 men and 19 women randomly assigned to the routine care group of a larger study examining symptom management intervention influence on recovery outcomes in elderly coronary artery bypass graft patients. No significant differences were found in symptom evaluation, symptom response, or physical functioning by gender over time. Women reported consistently higher symptom evaluation scores for shortness of breath, fatigue, depression, sleep disturbance, swelling, and anxiety and lower mean physical and vitality subscale scores than men at every time point. Gender-specific symptom management strategies should be developed and tested to address the differences in the reporting of symptoms by men and women. 相似文献
8.
Prideaux L Kamm MA De Cruz PP Chan FK Ng SC 《Journal of gastroenterology and hepatology》2012,27(8):1266-1280
The incidence and prevalence of inflammatory bowel diseases (IBD), Crohn's disease (CD) and ulcerative colitis (UC), are lower in Asia than in the West. However, across Asia the incidence and prevalence of IBD has increased rapidly over the last two to four decades. These changes may relate to increased contact with the West, westernization of diet, increasing antibiotics use, improved hygiene, vaccinations, or changes in the gut microbiota. Genetic factors also differ between Asians and the Caucasians. In Asia, UC is more prevalent than CD, although CD incidence is rapidly increasing in certain areas. There is a male predominance of CD in Asia, but a trend towards equal sex distribution for UC. IBD is diagnosed at a slightly older age than in the West, and there is rarely a second incidence peak as in the West. A positive family history is much less common than in the West, as are extra-intestinal disease manifestations. There are clear ethnic differences in incidence within countries in Asia, and an increased incidence in IBD in migrants from Asia to the West. Research in Asia, an area of rapidly changing IBD epidemiology, may lead to the discovery of critical etiologic factors that lead to the development of IBD. 相似文献
9.
Yulia Lin Everad Tilokee Sophie Charg Asim Alam Christine Cserti‐Gazdewich Wendy Lau Christie Lee Lani Lieberman Paula Nixon Wendy Owens Katerina Pavenski Jacob Pendergrast Elianna Saidenberg Nadine Shehata Robert Skeate Qi‐Long Yi David Conrad Jill Dudebout Cyrus C. Hsia Michael Murphy Oksana Prokopchuk‐Gauk Akshay Shah Ziad Solh Jacqueline Trudeau Michelle P. Zeller Jeannie Callum 《Transfusion》2019,59(6):2141-2149
10.