全文获取类型
收费全文 | 881篇 |
免费 | 34篇 |
国内免费 | 75篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 134篇 |
妇产科学 | 43篇 |
基础医学 | 62篇 |
口腔科学 | 18篇 |
临床医学 | 65篇 |
内科学 | 132篇 |
皮肤病学 | 43篇 |
神经病学 | 17篇 |
特种医学 | 104篇 |
外科学 | 145篇 |
综合类 | 85篇 |
预防医学 | 17篇 |
眼科学 | 36篇 |
药学 | 61篇 |
中国医学 | 1篇 |
肿瘤学 | 26篇 |
出版年
2022年 | 4篇 |
2021年 | 13篇 |
2020年 | 6篇 |
2019年 | 12篇 |
2018年 | 22篇 |
2017年 | 12篇 |
2016年 | 17篇 |
2015年 | 10篇 |
2014年 | 12篇 |
2013年 | 24篇 |
2012年 | 27篇 |
2011年 | 23篇 |
2010年 | 43篇 |
2009年 | 33篇 |
2008年 | 34篇 |
2007年 | 88篇 |
2006年 | 57篇 |
2005年 | 29篇 |
2004年 | 37篇 |
2003年 | 39篇 |
2002年 | 17篇 |
2001年 | 21篇 |
2000年 | 22篇 |
1999年 | 26篇 |
1998年 | 29篇 |
1997年 | 30篇 |
1996年 | 28篇 |
1995年 | 28篇 |
1994年 | 15篇 |
1993年 | 25篇 |
1992年 | 22篇 |
1991年 | 11篇 |
1990年 | 10篇 |
1989年 | 22篇 |
1988年 | 9篇 |
1987年 | 12篇 |
1986年 | 11篇 |
1985年 | 25篇 |
1984年 | 7篇 |
1983年 | 8篇 |
1982年 | 8篇 |
1981年 | 12篇 |
1980年 | 7篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 6篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1964年 | 3篇 |
1957年 | 3篇 |
排序方式: 共有990条查询结果,搜索用时 15 毫秒
1.
A Girdhar B Mishra R K Lavania A K Bagga G N Malaviya B K Girdhar 《International journal of leprosy and other mycobacterial diseases : official organ of the International Leprosy Association》1989,57(2):472-475
Two infants, one 4 months old and the other 2 months old, having histologically confirmed indeterminate leprosy are reported. The route of infection, mode of transmission, and incubation period are discussed with reference to these two cases of infantile leprosy. 相似文献
2.
3.
Background: The fabrication of dental prosthesis requires the transfer of interocclusal records from patient's mouth to semiadjustable articulators using different kinds of recording media. Any inaccuracy in these interocclusal records leads to occlusal errors in the final prosthesis. This study was conducted to evaluate the dimensional changes occurring in the interocclusal recording material over a given period of time and the material's resistance to compression during the cast mounting on the articulator. 相似文献
4.
5.
Regularity of DDS intake among 366 leprosy patients attending our out patient department voluntarily was assessed by urine spot test. It was found that only 54.6% of them had taken their last dose of drug within the previous three days. Those who kept their appointment showed better compliance than those who did not. Urinary DDS positivity was found to be unrelated to sex, occupation or the type of the disease. In the younger age group the compliance was low, as also among the patients coming from nearby places as compared to those who were residing in far off districts. 相似文献
6.
7.
RAJVIR BHALWAR HS SANDHU RC AHUJA GK SINGH RP MISRA 《Medical Journal Armed Forces India》1994,50(3):175-180
A population based hybrid design combining element of cohort and cross-sectional approach was used to develop a simple clinical algorithm to predict individual probability of developing hypertension (systolic BP > 140 mm Hg and/or diastolic BP > 90 mmHg). 3615 soldiers initially normotensive at the time of induction into high altitude, were studied by systematic random sampling. Multiple logistic regression analysis showed a high significant association between hypertension and age, body mass index (BMI), tobacco smoking and alcohol consumption. Using the constant/coefficient values obtained from the logistic model and the receiver operating characteristics (ROC) curve analysis, the following predictive rule was developed – To the age in years, add (BMIx 3.86); also add 5.53 if he is a smoker; and add 19.81 if he consumes alcohol. If the total exceeds 142, the individual is at high risk of developing hypertension. This algorithm carries a sensitivity of 68.2% and specificity of 78.5%.KEY WORDS: Hypertension, High altitude 相似文献
8.
The prevalence of microalbuminuria was assessed in 50 patients of non-insulin dependent diabetes mellitus. The mean age of patients was 52.1 ± 11.6 years and the duration of diabetes was 8.3 ± 6.8 years. Twenty (40%) patients had microalbuminuria. Microalbuminuria was more common in patients with a longer duration of diabetes (more than 5 years), a poor glycaemic control, and higher systolic blood pressure.KEY WORDS: Microalbuminuria, Diabetes mellitus, Diabetic nephropathy, Chronic renal failure 相似文献
9.
M S Reddy S R Naik O P Bagga H K Chuttani 《The American journal of clinical nutrition》1980,33(1):77-80
Salivary flow rates by mechanical stimulation with forced spitting method and by chemical stimulation with 10% citric acid were determined in 25 healthy adult subjects with a history of chronic tobacco-betel-lime "quid" chewing and in 25 healthy control adults with no history of chewing. The chewers secreted more saliva as compared to nonchewers on chemical, but not on mechanical stimulation. The salivary amylase, potassium, and sodium levels were lower in chewers, but the reductions of the first two components only were significant. These reductions were thought to be due to increased salivary flow with its dilutional effect. There was no difference between the two groups with respect to salivary pH. The salivary flow rates by either method had significant positive correlation with the duration of chewing, but not with the amount of tobacco chewed. Salivary potassium was inversely correlated with the amount of tobacco chewed. It was concluded that chronic tobacco-betel-lime quid chewing induces excessive secretion of more watery saliva leading to a concomitant decrease in enzyme and electrolyte content. One or more of the following factors were considered to be operating in causing increased salivary flow in chewers effect of nicotine or tobacco on other constituents of the quid, chronic salivary gland hyperplasia, or chronic hypertrophy of the muscles of mastication. 相似文献
10.
Recent investigations have emphasized the role of activated granulocytes in mediating vascular endothelial injury in the pathogenesis of shock lung. In vitro studies have indicated that tight adherence of the neutrophil to the endothelium is crucial for the development of cellular injury. Fibronectin is critical to cell-to- substratum and cell-to-cell interactions. Since fibronectin resides in plasma, on endothelial cell surfaces and is secreted into cell matrices, the adhesive properties of fibronectin must be modulated, lest universal cell agglomeration occur, yet be enhanced when cell attachment is appropriate. In these studies, treatment of fibronectin- coated surfaces with neutrophil release products increased the adhesion of activated neutrophils. Similarly, endothelial cells treated with neutrophil release products become a more adherent substrate for neutrophils. This enhanced adherence generated by treatment of fibronectin with neutrophil supernatants is inhibitable by heat and the lysosomal proteinase inhibitor, pepstatin-A. Neutrophil release products cause proteolytic fragmentation of fibronectin and enhanced fibronectin immunofluorescence on endothelial cells. In addition, neutrophils are more injurious to endothelial cells that have been pretreated with neutrophil release products. Neutrophils may enhance their own adherence to endothelial cells by altering fibronectin, and this altered, or "inflamed," fibronectin may serve as an amplifier of inflammation. 相似文献