全文获取类型
收费全文 | 310篇 |
免费 | 3篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 20篇 |
妇产科学 | 6篇 |
基础医学 | 31篇 |
口腔科学 | 11篇 |
临床医学 | 31篇 |
内科学 | 59篇 |
皮肤病学 | 2篇 |
神经病学 | 45篇 |
特种医学 | 9篇 |
外科学 | 20篇 |
综合类 | 12篇 |
预防医学 | 17篇 |
眼科学 | 8篇 |
药学 | 34篇 |
肿瘤学 | 6篇 |
出版年
2007年 | 1篇 |
2002年 | 1篇 |
2001年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 6篇 |
1996年 | 7篇 |
1995年 | 7篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1964年 | 2篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 22篇 |
1958年 | 41篇 |
1957年 | 38篇 |
1956年 | 33篇 |
1955年 | 23篇 |
1954年 | 27篇 |
1951年 | 1篇 |
1949年 | 9篇 |
1948年 | 15篇 |
1947年 | 3篇 |
1946年 | 2篇 |
1945年 | 1篇 |
1944年 | 1篇 |
1937年 | 1篇 |
排序方式: 共有313条查询结果,搜索用时 296 毫秒
1.
2.
The author is currently working in the office of Health Promotion,Ministry of Health in British Columbia. For the past 17 yearsshe has worked in Health and Welfare Canada as an advocate forcitizen participation in developing health programs and policies. This article is based on her experience as an advocate and bureaucratin translating and mediating health promotion rhetoric intoaction. The Canadian Healthy Communities and Strengthening Communitiesprojects are used as examples in analyzing the opportunitiesand contradictions in building alliances. 相似文献
3.
4.
LEVIER DAVID G.; MCCAY J. ANN; STERN MALVIN L.; HARRIS LOUIS S.; PAGE DENNIS; BROWN RONNETTA D.; MUSGROVE DEBORAH L.; BUTTERWORTH LEON F.; WHITE KIMBER L. JR.; MUNSON ALBERT E. 《Toxicological sciences》1994,22(4):525-542
This study was undertaken to investigate a number of immuneparameters which may be compromised with exposure to morphinesulfate. Mice were implanted subcutaneously with 8-, 25-, or75-mg morphine sulfate pellets. Placebo pellets of identicalmakeup to the 75-mg morphine pellet (without morphine of course)were used as a control. Twenty-four hours after implantationof a 75-mg morphine pellet, blood levels reached a peak of 1610ng/ml. Corticosterone increased in parallel with morphine andreached a peak level of 966 ng/ml 24 hr after implantation.The dose response of morphine to increase corticosterone, however,was fiat. The weight of the lymphoid organs, spleen and thymus,and the liver were significantly reduced in the morphine-treatedgroups. Morphine treatment was associated with an increase inserum albumin, SGPT, BUN, and alkaline phosphatase indicativeof hepatic damage. In contrast to increased serum proteins,the C3 component of complement was reduced in a dose-dependentmanner. Leukocyte number in the peripheral blood was significantlyreduced, while erythro-cyte number and hematocrit were bothincreased. The number of B cells and T cells was decreased inmorphine-treated animals. However, the percentage of T cellsrelative to B cells was increased. The primary IgM antibodyresponse to the T-depen-dent antigen, sheep red blood cells,was decreased. Natural killer cell activity was reduced in responseto morphine, as was the phagocytic capacity of Kupffer cells.Host-resistance models of Listeria monocytogenes or Streptococcuspneumoniae showed an increased resistance following administrationof morphine. This increased host resistance, however, was notdue to an increase in antimicrobial action of sera obtainedfrom mice treated with morphine. The majority of morphine'seffects on the immune system exhibited a flat dose response,suggesting that these effects may be mediated secondarily throughcorticosterone. 相似文献
5.
Dietary Changes Favorably Affect Bone Remodeling in Older Adults 总被引:4,自引:0,他引:4
ROBERT P. HEANEY MD DAVID A. McCARRON MD BESS DAWSON-HUGHES MD SUZANNE OPARIL MD SARAH L. BERGA MD JUDITH S. STERN ScD SUSAN I. BARR PhD CLIFFORD J. ROSEN MD 《Journal of the American Dietetic Association》1999,99(10):1228-1233
OBJECTIVE: To determine whether dietary counseling to increase milk intake could produce useful changes in the calcium economy and what, if any, other nutrition-related changes might be produced. DESIGN: Randomized, open trial. SUBJECTS/SETTING: Two hundred four healthy men and women, aged 55 to 85 years, who habitually consumed fewer than 1.5 servings of dairy foods per day. Six academic health centers in the United States. INTERVENTION: Subjects were instructed to consume 3 servings per day of nonfat milk or 1% milk as a part of their daily diets, or to maintain their usual diets, for a 12-week intervention period, which followed 4 weeks of baseline observations. MAIN OUTCOME MEASURES: Energy and nutrient intake assessed from milk intake logs and 3-day food records; serum calciotrophic hormone levels at baseline and at 8 and 12 weeks; urinary excretion of calcium and N-telopeptide at 12 weeks. STATISTICAL ANALYSES: Repeated-measures analysis of variance. RESULTS: In the milk-supplemented group, calcium intake increased by 729 +/- 45 mg/day (mean +/- standard error), serum parathyroid hormone level decreased by approximately 9%, and urinary excretion of N-telopeptide, a bone resorption marker, decreased by 13%. Urine calcium excretion increased in milk-supplemented subjects by 21 +/- 7.6 mg/day (mean +/- standard error), less than half the amount predicted to be absorbed from the increment in calcium intake. All of these changes were significantly different from baseline values in the milk group and from the corresponding changes in the control group. Bone-specific alkaline phosphatase level (a bone formation marker) fell by approximately 9% in both groups. Serum level of insulin-like growth factor-1 (IGF-1) rose by 10% in the milk group (P < .001), and the level of insulin-like growth factor binding protein-4 (IGFBP-4) fell slightly (1.9%) in the milk group and rose significantly (7.9%) in the control group (P < .05). APPLICATIONS/CONCLUSIONS: The changes observed in the calcium economy through consumption of food sources of calcium are similar in kind and extent to those reported previously for calcium supplement tablets. The increase in IGF-1 level and the decrease in IBFBP-4 level are new observations that are beneficial for bone health. Important improvements in skeletal metabolism can feasibly occur in older adults by consumption of food sources of calcium. Dietitians can be confident that food works, and that desired calcium intakes can be achieved using food sources. 相似文献
6.
R.BRIAN HAYNES PhD PENNY KRIS-ETHERTON PhD RD DAVID A McCARRON MD SUZANNE OPARIL MD ALAN CHAIT MD LAWRENCE M RESNICK MD CYNTHIA D MORRIS PhD SHARON CLARK PhD DANIEL C HATTON PhD JILL A METZ PhD MARGARET McMAHON MN SCOTT HOLCOMB MS GEOFFREY W SNYDER MS F.XAVIER PI-SUNYER MD JUDITH S STERN ScD RD 《Journal of the American Dietetic Association》1999,99(9):1077-1083
7.
8.
TOTAL AGANGLIONOSIS OF THE COLON (HIRSCHSPRUNG'S DISEASE) and CONGENITAL FAILURE OF AUTOMATIC CONTROL OF VENTILATION (ONDINE'S CURSE) 总被引:1,自引:0,他引:1
M. STERN H. H. HELLWEGE L. GRÄVINGHOFF W. LAMBRECHT 《Acta paediatrica (Oslo, Norway : 1992)》1981,70(1):121-124
Abstract. Stern, M., Hellwege, H. H., Grävinghoff, L. and Lambrecht, W. (Department of Paediatrics and Department of Surgery, University Hospital Eppendorf, Hamburg, Federal Republic of Germany). Total aganglionosis of the colon (Hirschsprung's disease) and congenital failure of automatic control of ventilation (Ondine's curse). Acta Paediatr Scand, 70:121, 1981.–Total aganglionosis of the colon presenting with small intestinal obstruction in the neonatal period was observed in combination with congenital alveolar hypoventilation requiring continuous mechanical ventilation in a boy. The patient died aged 15 months from acute dehydration due to enteritis, long after total resection of the aganglionic bowel had been performed. Pulmonary hypertension was found in the newborn period. There was progressive right ventricular myocardial hypertrophy. This is the fourth case reported with a combination of defects involving nerve cell function of the brain stem and gastrointestinal tract. 相似文献
9.
NURSING BEHAVIOUR, PROLACTIN AND POSTPARTUM AMENORRHOEA DURING PROLONGED LACTATION IN AMERICAN AND KUNG MOTHERS 总被引:1,自引:0,他引:1
In order to determine the effects of protracted nursing in American women, blood was collected hourly for 24 h and nursing periods recorded in 20 mothers, 10 amenorrhoeic, 3 3/4 to 17 1/4 months postpartum (PP), and 10 menstruating, 5 1/4 to 46 months PP. These data were compared to the daytime nursing behaviour and 1000-1100 h PRL of women among !Kung hunter-gatherers of Botswana, a non-contraceptive using population with a birth space interval of greater than 3 years. Intense nursing behaviour maintained amenorrhoea and hyperprolactinaemia for 1 to nearly 2 years PP in both American and !Kung mothers. Among Americans, 80 min of nursing per day, in conjunction with a minimum of six nursing episodes, was highly predictive of remaining amenorrhoeic up to 18 months PP. Amenorrhoea was always accompanied by hyperprolactinaemia, but delay in the onset of menses was related more to nursing behaviour than to a particular 24 h PRL level. The 1000-1100 h sample is equivalent to and about half of the 24 h mean in high and low intensity nursers, respectively. The !Kung women were similar to the high intensity nursing American women in 1000-1100 h PRL, percent amenorrhoeic, and the number of minutes of daytime nursing. 相似文献
10.