全文获取类型
收费全文 | 2102篇 |
免费 | 136篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 46篇 |
儿科学 | 88篇 |
妇产科学 | 27篇 |
基础医学 | 273篇 |
口腔科学 | 109篇 |
临床医学 | 129篇 |
内科学 | 540篇 |
皮肤病学 | 56篇 |
神经病学 | 50篇 |
特种医学 | 166篇 |
外国民族医学 | 1篇 |
外科学 | 268篇 |
综合类 | 54篇 |
预防医学 | 109篇 |
眼科学 | 63篇 |
药学 | 83篇 |
中国医学 | 2篇 |
肿瘤学 | 184篇 |
出版年
2022年 | 20篇 |
2021年 | 35篇 |
2020年 | 26篇 |
2019年 | 49篇 |
2018年 | 65篇 |
2017年 | 36篇 |
2016年 | 39篇 |
2015年 | 48篇 |
2014年 | 65篇 |
2013年 | 72篇 |
2012年 | 94篇 |
2011年 | 78篇 |
2010年 | 72篇 |
2009年 | 86篇 |
2008年 | 86篇 |
2007年 | 77篇 |
2006年 | 73篇 |
2005年 | 57篇 |
2004年 | 77篇 |
2003年 | 59篇 |
2002年 | 69篇 |
2001年 | 49篇 |
2000年 | 30篇 |
1999年 | 40篇 |
1998年 | 60篇 |
1997年 | 75篇 |
1996年 | 62篇 |
1995年 | 45篇 |
1994年 | 45篇 |
1993年 | 47篇 |
1992年 | 30篇 |
1991年 | 21篇 |
1990年 | 38篇 |
1989年 | 34篇 |
1988年 | 40篇 |
1987年 | 41篇 |
1986年 | 32篇 |
1985年 | 22篇 |
1984年 | 15篇 |
1983年 | 25篇 |
1982年 | 24篇 |
1981年 | 14篇 |
1980年 | 20篇 |
1979年 | 15篇 |
1978年 | 11篇 |
1977年 | 14篇 |
1976年 | 19篇 |
1975年 | 11篇 |
1968年 | 12篇 |
1965年 | 11篇 |
排序方式: 共有2248条查询结果,搜索用时 10 毫秒
41.
Mehra Nikita Christopher Vasanth Dhanushkodi Manikandan Radhakrishnan Venkatraman Ganesan Trivadi S Ganesharajah Selvaluxmy Sagar Tenali Gnana Ganesan Prasanth 《International journal of clinical pharmacy》2020,42(2):662-666
International Journal of Clinical Pharmacy - Background There is limited data on specific antiemetic protocols for control of chemotherapy-induced nausea/vomiting (CINV) caused by weekly cisplatin... 相似文献
42.
Gaurav Sharma Hitoshi Ohtani Gurvinder Kaur Taeko K. Naruse S.K. Sharma Madhu Vajpayee Akinori Kimura Narinder Mehra 《Human immunology》2013
The TIM (T cell/transmembrane, immunoglobulin and mucin) proteins are crucial regulators of Th1/Th2 immune responses and have been implicated in several diseases including HIV-1/AIDS. The TIM1 exon 4 that codes for mucin domain is highly diverse, with sequence variants associated with varying phenotypes. In this study, TIM1 exon 4 was sequenced among 227 HIV-1 seroprevalent and 288 healthy non infected individuals from North Indian population and haplotypes established. A novel but rare haplotype D1∗ was identified among the healthy and differed from D1 by a synonymous substitution G>T at Thr208Thr. The TIM1 haplotype diversity showed no association with susceptibility to HIV-1 infection. The seroprevalent individuals carrying D3A had relatively higher median CD4+T cell counts (368/μl) than those without (313/μl; p = 0.02). A comparison of CD4+T counts between D3-A individuals on ART or ART naïve did not show any significant difference plausibly due to confounding nature of ART and other factors. 相似文献
43.
The relative importance of thrombin inhibition and factor Xa inhibition to the antithrombotic effects of heparin 总被引:4,自引:1,他引:4
The relative importance of antithrombin and anti-factor Xa activities of heparin fractions required to achieve optimal antithrombotic effects is unknown. To study this, we measured the effects of standard heparin, an octasaccharide heparin fraction (anti-factor Xa activity only), and dermatan sulfate (antithrombin activity only) on the prevention of thrombosis and related this to their anticoagulant effects in vivo in rabbits. Thrombosis was measured as the incorporation of 125I- fibrinogen into tissue thromboplastin-induced thrombi using a Wessler- type model. Ex vivo changes in thrombin clotting time (TCT) were used as an index of antithrombin activity, and a chromogenic anti-factor Xa assay was used to measure anti-factor Xa activity. In addition, the ability of the three sulfated polysaccharides to simultaneously inhibit the generation of thrombin activity and to enhance the inactivation of the factor Xa added to initiate thrombin generation in plasma was determined. Standard heparin, in a dose of 10 anti-factor Xa U/kg, inhibited thrombus formation by 90%, prolonged the TCT by two seconds, and resulted in an anti-factor Xa level of 0.32 U/mL. The octasaccharide heparin fraction, in a dose of 10 anti-factor Xa U/kg, inhibited thrombus formation by 41%, had no effect on the TCT, and resulted in an anti-factor Xa level of 0.28 U/mL. Higher doses of the octasaccharide resulted in a further increase in the anti-factor Xa levels but had no further effect on thrombus formation. Dermatan sulfate, in a dose of 500 micrograms/kg, inhibited thrombus formation by 95%, but had no affect on the TCT. These results indicate that the antithrombotic effect achieved by inhibiting factor Xa is limited and that better antithrombotic effects are achieved by heparin or heparin- like substances capable of influencing the inactivation and/or the generation of thrombin. 相似文献
44.
45.
46.
Socioeconomic costs of HIV and TB and the difficulty of maintaining optimal treatment are well documented. Social protection measures such as food assistance may be required to offset some of the treatment related costs as well as to ensure food security and maintain good health of the affected individual and household. Programmes have started placing greater emphasis on treatment adherence and are looking for proven interventions that can optimize it. This paper looks at the effect of food assistance for enabling treatment adherence and reviews studies that used food assistance to promote adherence. Eight of ten studies found that provision of food can improve adherence and/or treatment completion for HIV care and treatment, ART and TB-DOTS. This indicates that food provision is not only a biological, but also a behavioural intervention, and underscores that unresolved food insecurity can be an impediment to treatment adherence and consequently to good treatment outcomes. 相似文献
47.
48.
49.
Abraham Samuel Babu Kushal Madan Sundar Kumar Veluswamy Rahul Mehra Arun G. Maiya 《Progress in cardiovascular diseases》2014
Worksite health and wellness (WH&W) are gaining popularity in targeting cardiovascular (CV) risk factors among various industries. India is a large country with a larger workforce in the unorganized sector than the organized sector. This imbalance creates numerous challenges and barriers to implementation of WH&W programs in India. Large scale surveys have identified various CV risk factors across various industries. However, there is scarcity of published studies focusing on the effects of WH&W programs in India. This paper will highlight: 1) the current trend of CV risk factors across the industrial community, 2) the existing models of delivery for WH&W in India and their barriers, and 3) a concise evidence based review of various WH&W interventions in India. 相似文献
50.
Anshul Mehra BDS MDS FAGE Keerthilatha M. Pai BDS MDS 《Clinical implant dentistry and related research》2012,14(1):100-111
Objectives: To evaluate the dimensional accuracy of panoramic cross‐sectional tomography, its impact on implant size estimation and its ability in identifying the inferior alveolar canal in the mandibular posterior region. Material and Methods: Eight partially edentulous mandibles with 18 edentulous sites were obtained. Orthopantomograms and tomograms were made and the mandible's outline and the position of mandibular canals on tomograms were traced on a clear acetate paper. Horizontal and vertical magnification factors were calculated. The mandibular height, distance between mandibular canal and alveolar crest, maximum bucco‐lingual width, distance between buccal cortex and mandibular canal, and cortical thickness at the inferior border of the mandible were measured. Potential implant sites were identified and implant sizes were estimated. Location and visibility of mandibular canals were also evaluated. The mandibles were sectioned at each site and all the above mentioned parameters were assessed which served as gold standard. Results: Mean horizontal and vertical magnification factors were 1.47 ± 0.048 and 1.53 ± 0.038. Total height and maximum bucco‐lingual width were underestimated by 1.88% and 1.59%. Crest to canal distance, cortical thickness at the inferior border of the mandible and buccal cortex to mandibular canal were overestimated by 0.59%, 5.16%, and 3.64%. Implant sizes were estimated for 11 sites and changes were recorded at 2 sites between record 1 and record 2. However, there was no disagreement between record 2 and record 3. Of the canals, 61.11% were located lingually and the visibility of mandibular canals was poor in 44.44% of cases. Conclusions: The tomograms were found to be accurate for the measurements in both horizontal and vertical planes and reliable for implant size estimation, taking into consideration proper magnification factors. They were also found to be useful in assessing the location of mandibular canal but were not very effective in discerning it. 相似文献