全文获取类型
收费全文 | 4840篇 |
免费 | 312篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 101篇 |
妇产科学 | 64篇 |
基础医学 | 755篇 |
口腔科学 | 48篇 |
临床医学 | 486篇 |
内科学 | 1267篇 |
皮肤病学 | 117篇 |
神经病学 | 375篇 |
特种医学 | 102篇 |
外科学 | 609篇 |
综合类 | 37篇 |
一般理论 | 3篇 |
预防医学 | 416篇 |
眼科学 | 66篇 |
药学 | 341篇 |
中国医学 | 5篇 |
肿瘤学 | 358篇 |
出版年
2023年 | 44篇 |
2022年 | 72篇 |
2021年 | 179篇 |
2020年 | 86篇 |
2019年 | 125篇 |
2018年 | 163篇 |
2017年 | 101篇 |
2016年 | 137篇 |
2015年 | 142篇 |
2014年 | 173篇 |
2013年 | 239篇 |
2012年 | 388篇 |
2011年 | 435篇 |
2010年 | 231篇 |
2009年 | 217篇 |
2008年 | 335篇 |
2007年 | 337篇 |
2006年 | 315篇 |
2005年 | 332篇 |
2004年 | 290篇 |
2003年 | 232篇 |
2002年 | 219篇 |
2001年 | 45篇 |
2000年 | 33篇 |
1999年 | 48篇 |
1998年 | 28篇 |
1997年 | 29篇 |
1996年 | 13篇 |
1995年 | 21篇 |
1994年 | 11篇 |
1993年 | 6篇 |
1992年 | 12篇 |
1991年 | 9篇 |
1990年 | 10篇 |
1989年 | 19篇 |
1988年 | 13篇 |
1987年 | 9篇 |
1986年 | 12篇 |
1985年 | 10篇 |
1983年 | 3篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1972年 | 2篇 |
排序方式: 共有5173条查询结果,搜索用时 0 毫秒
111.
112.
Grimoud AM Marty N Bocquet H Andrieu S Lodter JP Chabanon G 《Journal of Oral Science》2003,45(1):51-55
The population of elderly people in hospitals for long-term geriatric care presents many risk factors for nosocomial infection by Candida species. The aim of this work was to reduce the risk of C. albicans nosocomial infections starting from colonization of the oral cavity. The population of concern was the patients in long-stay geriatrics units; a sample of 110 people was selected by drawing lots. The clinical and biological parameters of each patient included in the study were recorded. The oral cavity was colonized by Candida spp in 67% of cases. The distribution of the strains showed that C. albicans was the most frequently identified strain, followed by C. glabrata; of the 73 patients with at least one strain of Candida spp., 47 had a clinically diagnosed candidiasis (64.4%). The wearing of dentures was not statistically linked with the development of oral candidiasis. Detecting which patients have been colonized, identifying the risk factors and applying preventive measures should reduce the probability of elderly people falling into the vicious circle of infection-malnutrition-immune-depression. 相似文献
113.
Sandrine F. Chebekoue 《Journal of occupational and environmental hygiene》2019,16(4):308-319
This study aimed at deriving occupational thresholds of toxicological concern for inhalation exposure to systemically-acting organic chemicals using predicted internal doses. The latter were also used to evaluate the quantitative relationship between occupational exposure limit and internal dose. Three internal dose measures were identified for investigation: (i) the daily area under the venous blood concentration vs. time curve, (ii) the daily rate of the amount of parent chemical metabolized, and (iii) the maximum venous blood concentration at the end of an 8-hr work shift. A dataset of 276 organic chemicals with 8-hr threshold limit values-time-weighted average was compiled along with their molecular structure and Cramer classes (Class I: low toxicity, Class II: intermediate toxicity, Class III: suggestive of significant toxicity). Using a human physiologically-based pharmacokinetic model, the three identified dose metrics were predicted for an 8-hr occupational inhalation exposure to the threshold limit value for each chemical. Distributional analyses of the predicted dose metrics were performed to identify the percentile values corresponding to the occupational thresholds of toxicological concern. Also, simple linear regression analyses were performed to evaluate the relationship between the 8-hr threshold limit value and each of the predicted dose metrics, respectively. No threshold of toxicological concern could be derived for class II due to few chemicals. Based on the daily rate of the amount of parent chemical metabolized, the proposed internal dose-based occupational thresholds of toxicological concern were 5.61?×?10?2 and 9?×?10?4 mmol/d at the 10th percentile level for classes I and III, respectively, while they were 4.55?×?10?1 and 8.5?×?10?3 mmol/d at the 25th percentile level. Even though high and significant correlations were observed between the 8-hr threshold limit values and the predicted dose metrics, the one with the rate of the amount of chemical metabolized was remarkable regardless of the Cramer class (r2 = 0.81; n = 276). The proposed internal dose-based occupational thresholds of toxicological concern are potentially useful for screening-level assessments as well as prioritization within an integrated occupational risk assessment framework. 相似文献
114.
115.
116.
117.
118.
119.