全文获取类型
收费全文 | 147504篇 |
免费 | 32478篇 |
国内免费 | 1252篇 |
专业分类
耳鼻咽喉 | 2833篇 |
儿科学 | 4185篇 |
妇产科学 | 3437篇 |
基础医学 | 9416篇 |
口腔科学 | 5798篇 |
临床医学 | 32238篇 |
内科学 | 34673篇 |
皮肤病学 | 4241篇 |
神经病学 | 17287篇 |
特种医学 | 4853篇 |
外国民族医学 | 3篇 |
外科学 | 23582篇 |
综合类 | 678篇 |
现状与发展 | 41篇 |
一般理论 | 42篇 |
预防医学 | 18145篇 |
眼科学 | 2945篇 |
药学 | 4221篇 |
中国医学 | 129篇 |
肿瘤学 | 12487篇 |
出版年
2024年 | 783篇 |
2023年 | 5305篇 |
2022年 | 1791篇 |
2021年 | 4023篇 |
2020年 | 6093篇 |
2019年 | 3398篇 |
2018年 | 8323篇 |
2017年 | 8306篇 |
2016年 | 9012篇 |
2015年 | 9239篇 |
2014年 | 12126篇 |
2013年 | 14516篇 |
2012年 | 7699篇 |
2011年 | 7668篇 |
2010年 | 8916篇 |
2009年 | 10864篇 |
2008年 | 6708篇 |
2007年 | 5830篇 |
2006年 | 6834篇 |
2005年 | 5319篇 |
2004年 | 4353篇 |
2003年 | 3791篇 |
2002年 | 3677篇 |
2001年 | 2260篇 |
2000年 | 1510篇 |
1999年 | 2124篇 |
1998年 | 2556篇 |
1997年 | 2331篇 |
1996年 | 2261篇 |
1995年 | 1976篇 |
1994年 | 1311篇 |
1993年 | 1176篇 |
1992年 | 1014篇 |
1991年 | 865篇 |
1990年 | 705篇 |
1989年 | 703篇 |
1988年 | 704篇 |
1987年 | 540篇 |
1986年 | 529篇 |
1985年 | 468篇 |
1984年 | 407篇 |
1983年 | 436篇 |
1982年 | 370篇 |
1981年 | 330篇 |
1980年 | 249篇 |
1979年 | 171篇 |
1978年 | 227篇 |
1977年 | 203篇 |
1976年 | 150篇 |
1974年 | 133篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
Peter Stone MD FRNZCOG FRCOG David Cook FRNZCOG MRCOG John Hutton PhD FRNZCOG FRCOG Gordon Purdie BSc Henry Murray MD FRNZCOG MRCOG Lauren Harcourt MPP BA 《The Australian & New Zealand journal of obstetrics & gynaecology》1995,35(1):32-37
Summary: This is the first report of the largest study of blood pressure measurement in pregnancy in a New Zealand population using standardized definitions and methodology. Over 3,800 women who delivered in an 8-month period in the Wellington region were included in the study. Blood pressure measurement and the presence of oedema and proteinuria were recorded from booking until delivery and in the puerperium. Only 2.7% of women were unable to be contacted after delivery for details on outcomes. The results established normal ranges for blood pressure throughout pregnancy. The data show that Mood pressure greater than 140/90 until 35 weeks' gestation is outside 2 standard deviations at all gestations and justifies using these measurements as the definition of hypertension in pregnancy. The fall in blood pressure in the 2nd trimester was less than 1 mm Ffg per week in both the systolic and diastolic pressures. This fall was smaller than previously recorded in other studies. Gestational hypertension was the commonest blood pressure abnormality occurring in 15.2% of the population. This represented 69% of the pregnant women with a hypertensive disorder. The overall incidence of both gestational hypertension and preeclampsia was 18.5% which is higher than reported in other parts of the world. In this study obesity was significantly associated with hypertensive disorders in pregnancy. An arm circumference of >33 cm, one of the measurements of obesity, was found in 6.8% of the study population. Even after the effect of arm circumference was taken into account, hypertensive disorders were also more common in Pacific Island women. Ankle oedema was significantly associated with the development of both gestational hypertension and preeclampsia but the incidence of oedema was noted in only 11.9% of the subjects. 相似文献
42.
Nursing in the health care system of the postmodern world: crossroads, paradoxes and complexity 总被引:1,自引:0,他引:1
Ada Spitzer RN PhD 《Journal of advanced nursing》1998,28(1):164-171
Entering the postmodern world in which society is confronting crossroads, paradoxes, and complexity, the health care system is encountering a transformation more comprehensive and revolutionary than has ever been seen before. Analysis of the state of nursing vis a vis these transformations indicates that the current paradigm does not ensure the existence of the profession in the postmodern health care system. That is because of increased difficulties in consolidating the economic and quality issues into the core of nursing, and in understanding the complexity inherent in health related situations. 相似文献
43.
Background: The bariatric patient exists in dynamic relationship with family members and friends who have considerable influence
upon the patient and his or her surgical outcome. When family members and friends behave as intimate saboteurs, they attempt
to hamper, hurt, or subvert the bariatric patient's goal of achieving and maintaining a healthy body weight. Successful or
not, intimate saboteurs provide significant treatment challenges for the patient and the treatment team. Methods and Patients:
Patient profiles provide examples of intimate sabotage. The psychological construct of Family Systems Theory is used as a
plausible explanation for the sabotage of friends and family. Conclusions: Multidisciplinary professionals treating the bariatric
patient must be aware of the critical influence of intimate saboteurs and the tactics they use to sabotage. Treatment guidelines
recommended by Family Systems Theory are presented as strategies to mitigate the influence of intimate saboteurs. 相似文献
44.
Cheryl Wallerstedt RNC MS Patricia Higgins RN PhD 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》1996,25(5):389-400
Society often expects mothers and fathers to share equally in the perinatal grief process because the child was a common bond between them. Unfortunately, in perinatal grief, this is not always the case. The mother and the father can experience incongruent grieving and use discordant coping mechanisms. It is important to evaluate these differences to facilitate communication between the distraught parents. Improved communication can in turn facilitate the grieving process. 相似文献
45.
46.
47.
48.
49.
50.
5-Amino-4-imidazolecarboxamide (AICA) riboside, the nucleoside corresponding to AICA ribotide (AICAR or ZMP), an intermediate of the de novo pathway of purine biosynthesis, was found to exert a dose-dependent inhibition on gluconeogenesis in isolated rat hepatocytes. Production of glucose from lactate-pyruvate mixtures was half-maximally inhibited by approximately 100 microM and completely suppressed by 500 microM AICA riboside. AICA riboside also inhibited the production of glucose from all other gluconeogenic precursors investigated, i.e., fructose, dihydroxyacetone, and L-proline. Measurements of intermediates of the glycolytic-gluconeogenic pathway showed that AICA riboside provoked elevations of triose phosphates and fructose-1,6-bisphosphate and decreases in fructose-6-phosphate and glucose-6-phosphate. The effects of AICA riboside persisted when the cells were washed 10 min after its addition but were suppressed by 5-iodotubercidin, an inhibitor of adenosine kinase. AICA riboside provoked a dose-dependent buildup of normally undetectable Z nucleotides. After 20 min of incubation with 500 microM AICA riboside, ZMP, ZTP, and ZDP reached 3, 0.3, and 0.1 mumol/g cells, respectively. Concentrations of ATP were not significantly modified by addition of up to 500 microM AICA riboside when the cells were incubated with lactate-pyruvate but decreased with fructose or dihydroxyacetone. The activity of rat liver fructose-1,6-bisphosphatase was inhibited by ZMP with an apparent Ki of 370 microM. It is concluded that AICA riboside exerts a suppressive effect on gluconeogenesis because it provokes an accumulation of ZMP, which inhibits fructose-1,6-bisphosphatase.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献