全文获取类型
收费全文 | 2153篇 |
免费 | 87篇 |
国内免费 | 30篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 95篇 |
妇产科学 | 19篇 |
基础医学 | 422篇 |
口腔科学 | 77篇 |
临床医学 | 248篇 |
内科学 | 494篇 |
皮肤病学 | 112篇 |
神经病学 | 40篇 |
特种医学 | 266篇 |
外科学 | 167篇 |
综合类 | 48篇 |
预防医学 | 73篇 |
眼科学 | 25篇 |
药学 | 138篇 |
中国医学 | 1篇 |
肿瘤学 | 42篇 |
出版年
2015年 | 24篇 |
2014年 | 21篇 |
2013年 | 74篇 |
2012年 | 22篇 |
2010年 | 44篇 |
2009年 | 30篇 |
2008年 | 21篇 |
2007年 | 43篇 |
2006年 | 45篇 |
2005年 | 23篇 |
2004年 | 18篇 |
2003年 | 23篇 |
2001年 | 29篇 |
2000年 | 22篇 |
1999年 | 33篇 |
1998年 | 83篇 |
1997年 | 95篇 |
1996年 | 104篇 |
1995年 | 70篇 |
1994年 | 73篇 |
1993年 | 76篇 |
1992年 | 39篇 |
1991年 | 36篇 |
1990年 | 41篇 |
1989年 | 66篇 |
1988年 | 57篇 |
1987年 | 48篇 |
1986年 | 51篇 |
1985年 | 38篇 |
1984年 | 55篇 |
1983年 | 27篇 |
1982年 | 31篇 |
1981年 | 37篇 |
1980年 | 49篇 |
1979年 | 23篇 |
1978年 | 27篇 |
1977年 | 35篇 |
1976年 | 38篇 |
1975年 | 36篇 |
1972年 | 24篇 |
1971年 | 21篇 |
1970年 | 23篇 |
1969年 | 18篇 |
1965年 | 50篇 |
1964年 | 50篇 |
1963年 | 47篇 |
1962年 | 41篇 |
1961年 | 40篇 |
1960年 | 65篇 |
1959年 | 20篇 |
排序方式: 共有2270条查询结果,搜索用时 31 毫秒
991.
Camilla M Ribeiro Erick JR Silva Barry T Hinton Maria Christina W Avellar 《Asian journal of andrology》2016,18(2):323-328
β-defensins are components of host defense, with antimicrobial and pleiotropic immuno-modulatory properties. Research over the last 15 years has demonstrated abundant expression of a variety of β-defensins in the postnatal epididymis of different species. A gradient of region- and cell-specific expression of these proteins is observed in the epithelium of the postnatal epididymis. Their secretion into the luminal fluid and binding to spermatozoa as they travel along the epididymis has suggested their involvement in reproduction-specific tasks. Therefore, continuous attention has been given to various β-defensins for their role in sperm function and fertility. Although β-defensins are largely dependent on androgens, the underlying mechanisms regulating their expression and function in the epididymis are not well understood. Recent investigation has pointed out to a new and interesting scenario where β-defensins emerge with a different expression pattern in the Wolffian duct, the embryonic precursor of the epididymis, as opposed to the adult epididymis, thereby redefining the concept concerning the multifunctional roles of β-defensins in the developing epididymis. In this review, we summarize some current views of β-defensins in the epididymis highlighting our most recent data and speculations on their role in the developing epididymis during the prenatal-to-postnatal transition, bringing attention to the many unanswered questions in this research area that may contribute to a better understanding of epididymal biology and male fertility. 相似文献
992.
N. IMURA S. M. OTANI M. J. A. CAMPOS E. G. JARDIM JR M. L. ZUOLO 《International endodontic journal》1997,30(6):381-385
Seventy extracted single-rooted mandibular premolars were used in this study to determine the length of time needed for bacteria present in natural human saliva to penetrate through three commonly used temporary restorative materials and through the entire root canal system obturated with the lateral condensation technique. Five intact teeth with no decay were used in the negative control group and five teeth with extensive decay in communication with the canal, in the positive control group. The 60 teeth used in the experimental group were divided into three groups. In Group 1, the access cavities of 20 teeth were temporarily restored with gutta percha, in Group 2 with IRM and in Group 3 with Cavit-G. All 70 teeth were mounted individually where the crown was placed in contact with human saliva. All five teeth in the positive control group caused broth turbidity within 24 h. In contrast, broth in the negative control group remained clear throughout the entire experimental period. In the experimental group, the average time for broth contamination of access cavities closed with gutta percha, IRM and Cavit-G was 7.85, 12.95 and 9.80 days, respectively. The Kruskal-Wallis nonparametric test showed significant differences among the groups, while the multiple comparison test showed that the IRM group was statistically better than the gutta percha group when the average lengths of time for contamination were compared ( P < 0.05). 相似文献
993.
994.
K.R. Anderson M.S. R.D. D.J. Norris M.S. R.D. L.B. Godfrey M.S. R.D. C. Kirk Avent M.D. C.E. Butterworth JR M.D 《JPEN. Journal of parenteral and enteral nutrition》1984,8(6):673-678
Bacterial cultures were made on tube-feeding formulas provided to 35 unselected adult patients on termination of the infusion. Bacteria were counted and identified using routine procedures. Formulas were classified as nonmanipulated, manipulated, or locally prepared. Medical records were reviewed to determine if diarrhea was present during the period that included 2 days on either side of the sampling day. A significant association was observed between the extent of bacterial contamination and the presence of diarrhea (p = 0.027). Locally prepared and manipulated formulas contained a significantly greater number of organisms when compared to nonmanipulated formulas (χ2 = 17.81, p < 0.001). Counts for two baseline and four termination cultures on locally prepared formulas exceeded the acceptable limit for coliform organisms in pasteurized milk according to public health standards. Eight additional cultures on commercial feeding formulas which were presumably sterile initially, exceeded these standards at the end of the administration period. Thus 12 of 35 formulas (34%) would not meet public health standards applicable to pasteurized milk. Use of sterile nonmanipulated formulas in a closed administration set is recommended, along with routine, periodic bacteriologic surveillance of enteral feeding programs. (Journal of Parenteral and Enteral Nutrition 8:673–678, 1984) 相似文献
995.
G. COLEMAN OSWALT JR. LEOPOLDO F. MONES GEORGE CASSADY 《Journal of cutaneous pathology》1978,5(4):193-199
Subcutaneous fat necrosis of the newborn (SFNN) developed in a 1-week-old black boy. His mother had received numerous medications for eclampsia. Birth was by Caesarean section and complicated by meconium aspiration. There were numerous nodules over the back, buttocks and extremities that yielded a caseous-like material. Microscopically, these nodules showed crystallization and necrosis of the fat. Hypoglycemia, pneumonia, oliguria, thrombocytopenia, seizures and urinary infection were associated with the cutaneous problem and led to a fatal outcome 2 weeks after birth. 相似文献
996.
The effect of fusarochromanone and T-2 toxin on DNA synthesisand radio-sulfate incorporation by rabbit articular chondrocyteswas studied in monolayer culture. T-2 toxin reduced DNA morethan 50% at 5 x 109 M; fusarochromanone caused smallbut progressive decrements over a range of 5 x 108 tol06 M. These actions are not specific for chondrocytes.The findings lend no support to the hypothesis that fusarochromanone,at least in unmodified form, is the etiologic agent in Kashin-Beckdisease. 相似文献
997.
998.
This report describes modifications in the techniques used for both the induction and elicitation of photoallergic contact dermatitis (PACD) in the guinea pig. These changes have improved the reliability of this animal as the model of choice for screening chemicals or products for (heir tendency to produce PACD.
The induction period consists of 15 exposures of the test substance to shoulder skin that has been abraded with a nylon brush rotating at 13,000 rpm. One hour later, the KM site is irradiated with broadband UVA from a source having some irradiance below 320 nm (UVA/b). The animals receive 450 J/cm2 of UVA during the three-week induction period. The elicitation (challenge) test is repeated fur two consecutive days. Each day, the test material, if a liquid, is applied to two sties even 30 lo 60 min for 6 h; then one of the sites receives 20 J/cm2 of UVA.
These photo-induction and photo-elicitation procedures have demonstrated that low-level concentrations (0.25% range) of 6-melhyl coumarin or musk ambrette will both induce and elicit PACD in the guinea pig. This report adds more evidence that the induction of PACD in the guinea pig is dependent on broadband UVA. 相似文献
The induction period consists of 15 exposures of the test substance to shoulder skin that has been abraded with a nylon brush rotating at 13,000 rpm. One hour later, the KM site is irradiated with broadband UVA from a source having some irradiance below 320 nm (UVA/b). The animals receive 450 J/cm
These photo-induction and photo-elicitation procedures have demonstrated that low-level concentrations (0.25% range) of 6-melhyl coumarin or musk ambrette will both induce and elicit PACD in the guinea pig. This report adds more evidence that the induction of PACD in the guinea pig is dependent on broadband UVA. 相似文献
999.
1000.