全文获取类型
收费全文 | 1181135篇 |
免费 | 80710篇 |
国内免费 | 1733篇 |
专业分类
耳鼻咽喉 | 16688篇 |
儿科学 | 33418篇 |
妇产科学 | 32149篇 |
基础医学 | 170573篇 |
口腔科学 | 34729篇 |
临床医学 | 101092篇 |
内科学 | 229249篇 |
皮肤病学 | 24642篇 |
神经病学 | 89813篇 |
特种医学 | 46521篇 |
外国民族医学 | 120篇 |
外科学 | 190632篇 |
综合类 | 24601篇 |
现状与发展 | 2篇 |
一般理论 | 380篇 |
预防医学 | 79176篇 |
眼科学 | 27430篇 |
药学 | 90218篇 |
3篇 | |
中国医学 | 2835篇 |
肿瘤学 | 69307篇 |
出版年
2018年 | 11965篇 |
2017年 | 9228篇 |
2016年 | 10337篇 |
2015年 | 11759篇 |
2014年 | 15886篇 |
2013年 | 23593篇 |
2012年 | 31647篇 |
2011年 | 32966篇 |
2010年 | 20072篇 |
2009年 | 18999篇 |
2008年 | 31885篇 |
2007年 | 33723篇 |
2006年 | 34299篇 |
2005年 | 32991篇 |
2004年 | 31901篇 |
2003年 | 30543篇 |
2002年 | 29706篇 |
2001年 | 65092篇 |
2000年 | 67209篇 |
1999年 | 55857篇 |
1998年 | 13208篇 |
1997年 | 11779篇 |
1996年 | 11741篇 |
1995年 | 11054篇 |
1994年 | 10198篇 |
1993年 | 9432篇 |
1992年 | 42118篇 |
1991年 | 40712篇 |
1990年 | 39504篇 |
1989年 | 38343篇 |
1988年 | 34980篇 |
1987年 | 34048篇 |
1986年 | 31870篇 |
1985年 | 30504篇 |
1984年 | 21800篇 |
1983年 | 18605篇 |
1982年 | 9891篇 |
1979年 | 19606篇 |
1978年 | 13417篇 |
1977年 | 11485篇 |
1976年 | 10080篇 |
1975年 | 11154篇 |
1974年 | 13450篇 |
1973年 | 12871篇 |
1972年 | 12153篇 |
1971年 | 11490篇 |
1970年 | 10968篇 |
1969年 | 10256篇 |
1968年 | 9492篇 |
1967年 | 8674篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Gerald T Voelbel Marsha E Bates Jennifer F Buckman Gahan Pandina Robert L Hendren 《Neuropsychopharmacology》2006,60(9):942-950
BACKGROUND: Impaired neuropsychological test performance, especially on tests of executive function and attention, is often seen in children diagnosed with autism spectrum disorders (ASD). Structures involved in fronto-striatal circuitry, such as the caudate nucleus, may support these cognitive abilities. However, few studies have examined caudate volumes specifically in children with ASD, or correlated caudate volumes to cognitive ability. METHODS: Neuropsychological test scores and caudate volumes of children with ASD were compared to those of children with bipolar disorder (BD) and of typically developing (TD) children. The relationship between test performance and caudate volumes was analyzed. RESULTS: The ASD group displayed larger right and left caudate volumes, and modest executive deficits, compared to TD controls. While caudate volume inversely predicted performance on the Wisconsin Card Sorting Test in all participants, it differentially predicted performance on measures of attention across the ASD, BD and TD groups. CONCLUSIONS: Larger caudate volumes were related to impaired problem solving. On a test of attention, larger left caudate volumes predicted increased impulsivity and more omission errors in the ASD group as compared to the TD group, however smaller volume predicted poorer discriminant responding as compared to the BD group. 相似文献
72.
N. Sinis H. O. Rennekampff M. Haerle H. -E. Schaller 《European journal of plastic surgery》2006,28(8):507-512
Intraoperative and postoperative free flap monitoring by means of oxygen tension measurement was carried out in 11 patients. We used an invasive flexible microcatheter that allowed for measurement of oxygen tension in all types of free flaps. Two cases of the measured flaps were buried free flaps which do not allow monitoring by clinical assessment. All flaps monitored in this study survived. One case of displacement of the microcatheter occurred. In one patient, the tissue pO2 monitor successfully detected early vascular thrombosis with subsequent reoperation and salvage of the free flap. 相似文献
73.
74.
75.
76.
C. O. Onyeaso BDS FWACS M. O. Arowojolu BDS FWACS J. O. Taiwo BDS MSc DDPH RCS Eng 《American journal of orthodontics and dentofacial orthopedics》2003,124(6):714-720
This prospective clinic-based study evaluated the pretreatment periodontal status of the orthodontic patients seen at the University College Hospital, Ibadan, Nigeria, and assessed the relationship between dental aesthetic index (DAI) scores and periodontal status according to community periodontal index of treatment needs (CPITN) scores. One hundred forty five patients-70 (48.3%) males and 75 (51.7%) females from 6 to 45 years (mean 15.8 +/- 7.5)-were seen. World Health Organization (WHO) guidelines were followed in the examination and reporting of the periodontal status, and DAI scores were assessed based on WHO guidelines. The chi-square test was used to determine the association between the DAI and the CPITN scores. Most patients were in the 6-15 (55.9%) or 16-25 (35.9%) age groups. Based on the WHO preferred cumulative calculations of treatment need (TN), 35.2% of the patients had TN 0, 64.9% had TN 1, 24.9% had TN 2, and only 0.7% had TN 3. The relationship between DAI scores and periodontal treatment needs was not statistically significant (P >.05). Although many patients were yet to attain the WHO goal of no more than 1 sextant affected by bleeding or calculus at the age of 15, over one third had satisfactory periodontal health. 相似文献
77.
78.
Rosario B Hidalgo Jerilyn Ross Jonathan R T Davidson 《Annals of clinical psychiatry》2006,18(3):157-162
BACKGROUND: Obsessive-compulsive disorder (OCD) is a chronic, impairing and often comorbid disorder. METHODS: 1000 subjects who called the Anxiety Disorders Association of America (ADAA) were surveyed and divided in three groups: (a) callers with OCD (OCD) and two overlapping control groups: (b) callers with no axis I disorder (NAC) and (c) with no-OCD (NOC) using a 97-item questionnaire. RESULTS: The rate of OCD was 14.5% (N = 145). Relative to the NOC group, OCD subjects were more likely to be female, White, younger and not married. Relative to the NAC group, subjects with OCD were more likely to be White, not married and younger. OCD was accompanied by significant comorbidity and was associated with an increased number of visits to health professionals than NAC subjects. There was no significant difference regarding unemployment rates among the three groups. However, OCD callers were more likely than both control groups to have missed work or have decreased productivity due to their mental condition. OCD subjects took an average of 1 psychotropic medication in the past year and were statistically more likely than the control groups to experience sleepiness and nervousness as side effects. CONCLUSIONS: OCD was fairly prevalent among ADAA callers and presented high levels of comorbidity, impairment, health care utilization and sensitivity to psychotropic side effects. 相似文献
79.
80.