全文获取类型
收费全文 | 4798588篇 |
免费 | 386283篇 |
国内免费 | 16192篇 |
专业分类
耳鼻咽喉 | 68013篇 |
儿科学 | 149780篇 |
妇产科学 | 129772篇 |
基础医学 | 716263篇 |
口腔科学 | 140064篇 |
临床医学 | 430082篇 |
内科学 | 872458篇 |
皮肤病学 | 115871篇 |
神经病学 | 401579篇 |
特种医学 | 191987篇 |
外国民族医学 | 1039篇 |
外科学 | 733792篇 |
综合类 | 145890篇 |
现状与发展 | 24篇 |
一般理论 | 2725篇 |
预防医学 | 393452篇 |
眼科学 | 113854篇 |
药学 | 345772篇 |
23篇 | |
中国医学 | 12992篇 |
肿瘤学 | 235631篇 |
出版年
2021年 | 56062篇 |
2019年 | 58789篇 |
2018年 | 74224篇 |
2017年 | 56896篇 |
2016年 | 63254篇 |
2015年 | 76255篇 |
2014年 | 110761篇 |
2013年 | 176276篇 |
2012年 | 127598篇 |
2011年 | 132480篇 |
2010年 | 126352篇 |
2009年 | 128155篇 |
2008年 | 119771篇 |
2007年 | 128699篇 |
2006年 | 136997篇 |
2005年 | 131881篇 |
2004年 | 133989篇 |
2003年 | 124093篇 |
2002年 | 113744篇 |
2001年 | 176879篇 |
2000年 | 173432篇 |
1999年 | 158870篇 |
1998年 | 73451篇 |
1997年 | 69106篇 |
1996年 | 66872篇 |
1995年 | 62263篇 |
1994年 | 56611篇 |
1993年 | 52616篇 |
1992年 | 120725篇 |
1991年 | 116153篇 |
1990年 | 112342篇 |
1989年 | 110059篇 |
1988年 | 102742篇 |
1987年 | 100685篇 |
1986年 | 96221篇 |
1985年 | 94168篇 |
1984年 | 77330篇 |
1983年 | 68221篇 |
1982年 | 52003篇 |
1981年 | 48109篇 |
1980年 | 45329篇 |
1979年 | 70858篇 |
1978年 | 55346篇 |
1977年 | 48732篇 |
1976年 | 44960篇 |
1975年 | 45991篇 |
1974年 | 52815篇 |
1973年 | 50857篇 |
1972年 | 47956篇 |
1971年 | 44646篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Nickel Allergy and Our Children's Health: A Review of Indexed Cases and a View of Future Prevention 下载免费PDF全文
Sharon E. Jacob M.D. Alina Goldenberg M.D. M.A.S. Janice L. Pelletier M.D. Luz S. Fonacier M.D. Richard Usatine M.D. Nanette Silverberg M.D. 《Pediatric dermatology》2015,32(6):779-785
Nickel is the leading cause of allergic contact dermatitis (ACD) from early childhood through adolescence. Studies have shown that skin piercings and other nickel‐laden exposures can trigger the onset of nickel ACD in those who are susceptible. Nickel ACD causes a vast amount of cutaneous disease in children. Cases of nickel ACD in children have been reported in peer‐reviewed literature from 28 states. Common items that contain inciting nickel include jewelry, coins, zippers, belts, tools, toys, chair studs, cases for cell phones and tablets, and dental appliances. The diagnosis of nickel ACD has been routinely confirmed by patch testing in children older than 6 months suspected of ACD from nickel. Unlike in Europe, there are no mandatory restrictions legislated for nickel exposure in the United States. Denmark has demonstrated that regulation of the nickel content in metals can lower the risk of ACD and the associated health care–related costs that arise from excess nickel exposure. To further awareness, this article reviews the prominent role of nickel in pediatric skin disease in the United States. It discusses the need for a campaign by caretakers to reduce nickel‐related morbidity. Lastly, it promotes the model of European legislation as a successful intervention in the prevention of nickel ACD. 相似文献
992.
Ariella Nouriel M.D. Jonah Zisquit M.D. Alexander M. Helfand M.D. Shoshana Greenberger M.D. Ph.D. 《Pediatric dermatology》2015,32(6):e245-e248
A 3‐year‐old Arab boy with a history of hypoplastic left heart syndrome was referred to the pediatric dermatology clinic at Sheba Medical Center for evaluation of hypomelanosis, manifested by fair skin pigmentation and silvery‐grey hair, eyebrows, and eyelashes. The child had one older brother with similar hypopigmentation and another older brother who had died of congenital heart disease. The child had no history of neurologic deficits or immunodeficiency and no additional findings on clinical evaluation. 相似文献
993.
994.
995.
996.
997.
Fluid is usually restricted during thoracic surgery, and vasoactive agents are often administered to maintain blood pressure. One-lung ventilation (OLV) decreases arterial oxygenation; thus oxygen delivery to the brain can be decreased. In this study, we compared phenylephrine and dopamine with respect to maintaining cerebral oxygenation during OLV in major thoracic surgery.Sixty-three patients undergoing lobectomies were randomly assigned to the dopamine (D) or phenylephrine (P) group. The patients’ mean arterial pressure was maintained within 20% of baseline by a continuous infusion of dopamine or phenylephrine. Maintenance fluid was kept at 5 mL/kg/h. The depth of anesthesia was maintained with desflurane 1MAC and remifentanil infusion under bispectral index guidance. Regional cerebral oxygen saturation (rScO2) and hemodynamic variables were recorded using near-infrared spectroscopy and esophageal cardiac Doppler.The rScO2 was higher in the D group than the P group during OLV (OLV 60 min: 71 ± 6% vs 63 ± 12%; P = 0.03). The number of patients whose rScO2 dropped more than 20% from baseline was 0 and 6 in the D and P groups, respectively (P = 0.02). The D group showed higher cardiac output, but lower mean arterial pressure than the P group (4.7 ± 1.0 vs 3.9 ± 1.2 L/min; 76.7 ± 8.1 vs 84.5 ± 7.5 mm Hg; P = 0.02, P = 0.02). Among the variables, age, hemoglobin concentration, and cardiac output were associated with rScO2 by correlation analysis.Dopamine was superior to phenylephrine in maintaining cerebral oxygenation during OLV in thoracic surgery. 相似文献
998.
999.
The association between family affluence and smoking among 15‐year‐old adolescents in 33 European countries,Israel and Canada: the role of national wealth 下载免费PDF全文
1000.