全文获取类型
收费全文 | 27040篇 |
免费 | 2424篇 |
国内免费 | 117篇 |
专业分类
耳鼻咽喉 | 279篇 |
儿科学 | 615篇 |
妇产科学 | 388篇 |
基础医学 | 3227篇 |
口腔科学 | 817篇 |
临床医学 | 3520篇 |
内科学 | 5646篇 |
皮肤病学 | 653篇 |
神经病学 | 1919篇 |
特种医学 | 1150篇 |
外科学 | 3706篇 |
综合类 | 762篇 |
一般理论 | 24篇 |
预防医学 | 2857篇 |
眼科学 | 383篇 |
药学 | 2180篇 |
3篇 | |
中国医学 | 122篇 |
肿瘤学 | 1330篇 |
出版年
2021年 | 395篇 |
2020年 | 241篇 |
2019年 | 361篇 |
2018年 | 384篇 |
2017年 | 301篇 |
2016年 | 357篇 |
2015年 | 417篇 |
2014年 | 571篇 |
2013年 | 882篇 |
2012年 | 1230篇 |
2011年 | 1213篇 |
2010年 | 708篇 |
2009年 | 662篇 |
2008年 | 1151篇 |
2007年 | 1153篇 |
2006年 | 1180篇 |
2005年 | 1181篇 |
2004年 | 1067篇 |
2003年 | 1005篇 |
2002年 | 1004篇 |
2001年 | 1023篇 |
2000年 | 1041篇 |
1999年 | 871篇 |
1998年 | 332篇 |
1997年 | 294篇 |
1996年 | 284篇 |
1995年 | 287篇 |
1994年 | 240篇 |
1993年 | 236篇 |
1992年 | 614篇 |
1991年 | 644篇 |
1990年 | 601篇 |
1989年 | 534篇 |
1988年 | 508篇 |
1987年 | 499篇 |
1986年 | 484篇 |
1985年 | 496篇 |
1984年 | 361篇 |
1983年 | 305篇 |
1982年 | 223篇 |
1981年 | 213篇 |
1979年 | 328篇 |
1978年 | 241篇 |
1977年 | 210篇 |
1975年 | 173篇 |
1974年 | 214篇 |
1973年 | 205篇 |
1972年 | 169篇 |
1971年 | 193篇 |
1970年 | 170篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Phoebe Hammer Kevin White Stephanie Mengden Vessy Korcheva Philipp W. Raess 《Journal of cutaneous pathology》2019,46(5):343-346
Cutaneous leiomyomas are rare benign smooth‐muscle tumors. These lesions are distinguished based on their cell of origin and are subclassified as pilar leiomyoma, angioleiomyoma, and genital‐type leiomyoma. Nipple leiomyoma is the least common genital‐type leiomyoma, arising from the dartoic muscle cell of the nipple. Histologic examination of the lesion is necessary for definitive diagnosis, and these uncommon tumors can pose a diagnostic challenge. We describe herein a series of six nipple leiomyomas with a spectrum of histologic appearances. 相似文献
2.
Tonya J.H. White 《Journal of the American Academy of Child and Adolescent Psychiatry》2019,58(11):1042-1050
3.
4.
5.
Jamaal L. Benjamin MD PhD Rebecca Dennis DO Stacy White Jr MD David Munson MD Sudha A. Anupindi MD Maciej Piskunowicz MD Kassa Darge MD PhD Ami Gokli MD Misun Hwang MD 《Journal of ultrasound in medicine》2020,39(5):1031-1036
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates. 相似文献
6.
Eric E Rasmussen Autumn Shafer Malinda J. Colwell Shawna White Narissra Punyanunt-Carter Rebecca L. Densley 《Journal of Children and Media》2016,10(4):443-461
This study explored the relationship between active mediation, exposure to Daniel Tiger’s Neighborhood, and key indicators of preschoolers’ social and emotional development. One hundred and twenty-seven children aged 2–6 either watched or did not watch 10 episodes of Daniel Tiger’s Neighborhood over a two-week period. Results revealed that preschoolers who watched the program exhibited higher levels of empathy, self-efficacy, and emotion recognition when their regular TV-watching experiences are frequently accompanied by active mediation. This was especially true for younger preschoolers and preschoolers from low-income families. Implications for policy-makers, parents, producers of prosocial programming, and educators are discussed. 相似文献
7.
8.
Auda A. Eltahla Fabio Luciani Peter A. White Andrew R. Lloyd Rowena A. Bull 《Viruses》2015,7(10):5206-5224
The hepatitis C virus (HCV) is a pandemic human pathogen posing a substantial health and economic burden in both developing and developed countries. Controlling the spread of HCV through behavioural prevention strategies has met with limited success and vaccine development remains slow. The development of antiviral therapeutic agents has also been challenging, primarily due to the lack of efficient cell culture and animal models for all HCV genotypes, as well as the large genetic diversity between HCV strains. On the other hand, the use of interferon-α-based treatments in combination with the guanosine analogue, ribavirin, achieved limited success, and widespread use of these therapies has been hampered by prevalent side effects. For more than a decade, the HCV RNA-dependent RNA polymerase (RdRp) has been targeted for antiviral development. Direct acting antivirals (DAA) have been identified which bind to one of at least six RdRp inhibitor-binding sites, and are now becoming a mainstay of highly effective and well tolerated antiviral treatment for HCV infection. Here we review the different classes of RdRp inhibitors and their mode of action against HCV. Furthermore, the mechanism of antiviral resistance to each class is described, including naturally occurring resistance-associated variants (RAVs) in different viral strains and genotypes. Finally, we review the impact of these RAVs on treatment outcomes with the newly developed regimens. 相似文献
9.
10.
乐敏飞 《中国公共卫生管理》2016,(4):477-479
目的调查宁波市北仑区0~14岁儿童哮喘发病率、发病规律及危险因素,为制定防治措施提供参考。方法2013年1月-2014年1月,采用整群抽样法抽取北仑区19所学校0~14岁儿童为调查对象进行问卷调查,对筛查出的疑似哮喘儿童进行确诊,并对其人口学特征进行分析,采用logistic回归方程分析危险因素。结果调查收回有效问卷23 781份,共检出哮喘患儿534例,发病率为2.25%,男女发病率比例为1.92:1。其中发病较轻患儿占44.01%,中度占31.46%,重度占24.53%。发病时间以换季、冬季为主,分别占35.96%、32.02%。多因素logistic回归分析显示,呼吸道感染、药物过敏史、家族过敏史和食物过敏史是儿童哮喘发病的危险因素(P<0.05)。结论北仑区儿童哮喘发病率较高,具有性别和季节发病差异,应加大对患病危险因素的宣传,规范标准化治疗方案,减少儿童哮喘疾病的发生。 相似文献