全文获取类型
收费全文 | 2914篇 |
免费 | 214篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 48篇 |
儿科学 | 241篇 |
妇产科学 | 91篇 |
基础医学 | 470篇 |
口腔科学 | 28篇 |
临床医学 | 272篇 |
内科学 | 692篇 |
皮肤病学 | 7篇 |
神经病学 | 273篇 |
特种医学 | 146篇 |
外国民族医学 | 1篇 |
外科学 | 340篇 |
综合类 | 67篇 |
一般理论 | 2篇 |
预防医学 | 155篇 |
眼科学 | 103篇 |
药学 | 100篇 |
中国医学 | 5篇 |
肿瘤学 | 101篇 |
出版年
2021年 | 25篇 |
2020年 | 23篇 |
2019年 | 30篇 |
2018年 | 40篇 |
2017年 | 26篇 |
2016年 | 31篇 |
2015年 | 39篇 |
2014年 | 46篇 |
2013年 | 73篇 |
2012年 | 121篇 |
2011年 | 123篇 |
2010年 | 78篇 |
2009年 | 55篇 |
2008年 | 88篇 |
2007年 | 101篇 |
2006年 | 95篇 |
2005年 | 85篇 |
2004年 | 106篇 |
2003年 | 97篇 |
2002年 | 74篇 |
2001年 | 92篇 |
2000年 | 112篇 |
1999年 | 92篇 |
1998年 | 41篇 |
1997年 | 36篇 |
1996年 | 39篇 |
1995年 | 36篇 |
1994年 | 36篇 |
1993年 | 32篇 |
1992年 | 88篇 |
1991年 | 89篇 |
1990年 | 59篇 |
1989年 | 67篇 |
1988年 | 68篇 |
1987年 | 64篇 |
1986年 | 68篇 |
1985年 | 62篇 |
1984年 | 42篇 |
1983年 | 44篇 |
1982年 | 27篇 |
1981年 | 34篇 |
1980年 | 24篇 |
1979年 | 38篇 |
1978年 | 27篇 |
1977年 | 38篇 |
1976年 | 28篇 |
1974年 | 24篇 |
1926年 | 23篇 |
1925年 | 28篇 |
1924年 | 22篇 |
排序方式: 共有3142条查询结果,搜索用时 15 毫秒
1.
Pyloromyotomy of Ramstedt: experience of a nonspecialized centre 总被引:2,自引:0,他引:2
In a general hospital over a period of 6 years 57 infants with congenital hypertrophic stenosis underwent a Ramstedt pylorotomy. In most cases a surgical resident-in-training performed the operation under the direct supervision of a general surgeon. There were no complications of anesthesia, no deaths and no substantial morbidity. The majority of infants left the hospital within 48 hours. The results in this series compared favourably with those reported from more specialized centres. 相似文献
2.
R M Rosenfeld 《Archives of otolaryngology--head & neck surgery》1992,118(4):445-447
3.
Impact of pediatricians' attire on children and parents 总被引:1,自引:0,他引:1
R V Marino W Rosenfeld P Narula M Karakurum 《Journal of developmental and behavioral pediatrics : JDBP》1991,12(2):98-101
To evaluate perceptions of a pediatrician's attire, 50 children and parents in an outpatient facility were shown five photographs of a female or a male physician dressed differently (formal to informal). A list of positive and negative attributes was presented to the parents and children who were to match each picture to the attributes. Parents had a strong positive preference for the formally dressed female (short white coat and skirt), and the formally dressed male (short white coat and tie). More than 50% of the parents least preferred the most informal attire. Children had no clear preferences for males and preferred the female in the blouse and skirt. Children assigned negative attributes to informal attire but not to the same degree as did their parents. This study demonstrates that parents have stronger preferences than do their children. Although children had no strong positive preferences, they may feel negatively about informal attire. 相似文献
4.
B Zumoff G W Strain L K Miller W Rosner C D Levit E H Miller R S Rosenfeld 《International journal of obesity (2005)》1988,12(6):525-531
Obese men have hyperestrogenemia-induced hypogonadotropic hypogonadism (HHG), due, we believe, to increased rarmatization of adrenal androgens by the increased bulk of aromatase-containing adipose tissue. We studied the effects of corticosuppressive doses of dexamethasone (D) on 24-h mean plasma total and free estradiol (E2), estrone (E1), LH, FSH, total and free testosterone, delta 4-androstenedione (delta 4), and sex-hormone-binding globulin (SHBG) in nine obese men and five normal-weight controls. In the obese men, the following hormones fell: E2 [59 +/- 19 to 39 +/- 11 pg/ml (P less than 0.01)], E1 [93 +/- 41 to 50 +/- 25 pg/ml; (P less than 0.01)], delta 4-androstenedione [120 +/- 80 to 55 +/- 27 ng/dl; (P less than 0.02)]; free E2 [1.6 +/- 0.4 to 1.1 +/- 0.2 pg/ml; (P less than 0.01)], SHBG [12.8 +/- 5.3 to 8.2 +/- 3 nM/l; (P less than 0.04)]. FSH rose from 4.8 +/- 3.2 to 7.6 +/- 4.2 miu/ml (P less than 0.01). LH, total and free testosterone showed no significant change. In the nonobese men, there were decreases in total E2 [(34 +/- 6.8 to 25 +/- 10 pg/ml; P less than 0.04)], SHBG [16.8 +/- 7.5 to 10.4 +/- 2.0 nM/l: P less than .05.], free E2 [0.9 +/- 0.2 to 0.7 +/- 0.3 pg/ml: P less than 0.05], delta 4 [91.4 +/- 3.6 to 33.4 +/- 16.7 ng/dl; P less than .01] and total T [492 +/- 44 to 393 +/- 121 ng/dl; P less than 0.04]. There was no significant change in E1, FSH, LH or free T.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
5.
Jonas T. Johnson MD Editor John K. Niparko MD Editor-in-Chief Paul A. Levine MD Editor David W. Kennedy MD Editor Pete Weber MD Editor-in-Chief Randal S. Weber MD Editor Michael S. Benninger MD Past Editor in Chief Richard M. Rosenfeld MD MPH Editor in Chief Robert J. Ruben MD Editor in Chief Richard J.H. Smith MD Editor in Chief Robert Thayer Sataloff MD DMA Editor in Chief Neil Weir MA FRCS Editor Emeritus 《Otolaryngology--head and neck surgery》2006,135(6):829-830
6.
7.
C S Rosenfeld H E Tedrow R Bryan K F Mangan R K Shadduck 《Experimental hematology》1988,16(8):702-704
Large volumes of bone marrow may be required for certain types of autologous bone marrow transplants. The present study was done to determine whether red cells obtained during a bone marrow harvest would be useful in reducing homologous transfusion requirements. A group of patients receiving standard transfusion support during the harvest (group 1) was compared to a group that received processed bone marrow red cells (PBMRBC) (group 2). Using the Cobe 2991 cell processor, 90% of the harvested bone marrow red cells were extracted and transfused during the procedure. Group 2 received a median of 1500 ml of blood processed from the bone marrow or 413 ml (volume of marrow processed x hematocrit) of red cells. Infusion of the PBMRBC reduced the homologous transfusion requirement from 6.5 units to 3.0 units (p = 0.02). In addition, group 1 had a 20% decrease in hematocrit following transfusion compared to the pre-harvest hematocrit, as opposed to an 8% decrease in group 2 (p = 0.02). This study indicates that PBMRBC can reduce the homologous transfusion requirements during an autologous bone marrow harvest. 相似文献
8.
9.
10.
R Dixon AM Hughes K Nairn M Sellers JV Kemp RA Yates 《Cephalalgia : an international journal of headache》1998,18(7):468-475
Zolmitriptan (ZomigTM ) is a 5HT1B/1D agonist which has the ability to cross the intact blood-brain barrier to access central as well as peripheral receptors. Because of the potential for central nervous system side effects, this randomized, double-blind, placebo-controlled, 6-period crossover study evaluated the effects of 2.5 and 5 mg doses of zolmitriptan on psychomotor performance and investigated any pharmacodynamic or pharmacokinetic interaction with diazepam. Twelve healthy volunteers received the following "treatments" as single doses: zolmitriptan 2.5 mg, zolmitriptan 5 mg, diazepam 10 mg, zolmitriptan 2.5 mg+diazepam 10 mg, zolmitriptan 5 mg+diazepam 10 mg and placebo. Pre-dose and at 1, 4, 8, and 24 h post-dose, the following validated battery of psychomotor tests was performed: Bond-Lader visual analogue scales (calmness, contentedness, and alertness factors), critical flicker fusion test, choice reaction time (recognition, motor, and total reaction times), finger-tapping test, number cancellation test and digit symbol substitution test. Plasma concentrations of zolmitriptan, its active metabolite, and diazepam and its active metabolites were measured at the same timepoints. Zolmitriptan 2.5 and 5 mg had no effect on psychomotor function when given alone. In contrast, diazepam 10 mg had profound effects, consistent with its sedative properties, but there was no synergism on concomitant administration of either dose of zolmitriptan. Plasma concentrations of zolmitriptan, diazepam, and their respective active metabolites were similar when the two drugs were given alone or in combination. 相似文献