全文获取类型
收费全文 | 241928篇 |
免费 | 6133篇 |
国内免费 | 126篇 |
专业分类
耳鼻咽喉 | 1608篇 |
儿科学 | 9034篇 |
妇产科学 | 5266篇 |
基础医学 | 24965篇 |
口腔科学 | 2397篇 |
临床医学 | 23432篇 |
内科学 | 42960篇 |
皮肤病学 | 1830篇 |
神经病学 | 22542篇 |
特种医学 | 10441篇 |
外国民族医学 | 33篇 |
外科学 | 35302篇 |
综合类 | 3507篇 |
一般理论 | 94篇 |
预防医学 | 26373篇 |
眼科学 | 3505篇 |
药学 | 13390篇 |
1篇 | |
中国医学 | 727篇 |
肿瘤学 | 20780篇 |
出版年
2023年 | 359篇 |
2022年 | 349篇 |
2021年 | 1272篇 |
2020年 | 874篇 |
2019年 | 1389篇 |
2018年 | 23289篇 |
2017年 | 18326篇 |
2016年 | 20562篇 |
2015年 | 2196篇 |
2014年 | 2602篇 |
2013年 | 3752篇 |
2012年 | 11120篇 |
2011年 | 25270篇 |
2010年 | 21039篇 |
2009年 | 13692篇 |
2008年 | 23336篇 |
2007年 | 25973篇 |
2006年 | 4861篇 |
2005年 | 6299篇 |
2004年 | 7409篇 |
2003年 | 8178篇 |
2002年 | 6036篇 |
2001年 | 1307篇 |
2000年 | 1380篇 |
1999年 | 1161篇 |
1998年 | 1054篇 |
1997年 | 890篇 |
1996年 | 721篇 |
1995年 | 640篇 |
1994年 | 632篇 |
1993年 | 586篇 |
1992年 | 756篇 |
1991年 | 754篇 |
1990年 | 754篇 |
1989年 | 615篇 |
1988年 | 580篇 |
1987年 | 619篇 |
1986年 | 540篇 |
1985年 | 578篇 |
1984年 | 514篇 |
1983年 | 481篇 |
1982年 | 450篇 |
1981年 | 404篇 |
1980年 | 361篇 |
1979年 | 369篇 |
1978年 | 315篇 |
1977年 | 265篇 |
1974年 | 264篇 |
1973年 | 246篇 |
1972年 | 218篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
Sally Urang Lorna Davis Charlotte Cram Elsberry Mary Kay Kozlowski 《Journal of Midwifery & Women's Health》1993,38(Z1):95s-99s
Fetal scalp blood sampling (FSBS), in conjunction with fetal heart rate monitoring, is a method of fetal surveillance that may avoid cesarean delivery of the healthy fetus or indicate the need for immediate delivery of a compromised fetus. Some researchers have recently begun to question the efficacy of FSBS. In this article, three nurse-midwives discuss FSBS as a tool in assessing fetal well-being during labor and consider whether FSBS is a nurse-midwifery procedure. 相似文献
62.
David A. Hughes Graham C. Smith Joyce E. Davidson Anna V. Murphy T. James Beattie 《Pediatric nephrology (Berlin, Germany)》1996,10(4):445-447
. Neutrophil-mediated tissue damage has been implicated in the pathogenesis of diarrhoea-associated haemolytic uraemic syndrome
(D+ HUS). This study evaluates priming and activation of the neutrophil oxidative burst in D+ HUS using chemiluminescent techniques.
Peripheral blood neutrophils from 11 children with acute D+ HUS were examined. No difference was found in the oxidative burst
of neutrophils from patients and controls. Serum elastase levels were measured in 8 patients and found to be significantly
elevated. Although elastase results suggest neutrophil activation, chemiluminescence studies do not confirm this in the peripheral
blood neutrophil. This does not support a significant role for circulating agents in priming and activating the peripheral
blood neutrophil.
Received August 17, 1995; received in revised form and accepted November 27, 1995 相似文献
63.
Glynis Murphy 《Journal of Applied Research in Intellectual Disabilities》1998,11(4):293-293
64.
CT- or sonography-guided biopsy of the liver in the presence of ascites: frequency of complications 总被引:1,自引:0,他引:1
F B Murphy K P Barefield H V Steinberg M E Bernardino 《AJR. American journal of roentgenology》1988,151(3):485-486
The presence of ascites has been considered a contraindication to percutaneous biopsy of the liver. To determine the validity of this assumption, we performed percutaneous biopsies of the liver under CT or sonographic guidance in 28 patients who had ascites and in 28 patients who did not have ascites and compared the complication rates in the two groups. Twenty-two patients (79%) in the group with ascites and 19 patients (68%) in the group without ascites had biopsies to determine the cause or extent of chronic liver disease. The remainder were oncologic patients who had biopsies to determine the cause of a focal hepatic mass. The complication rate in the patients who had ascites (32%) was less than that in the patients who did not have ascites (43%) (the difference did not reach statistical significance, p less than .30). In the ascites group, complications included transient hypotension (five patients), a mild-to-moderate fall in hematocrit (three patients), and a small leak of ascites from the biopsy site (one patient). In the control group, minor complications included transient hypotension (three patients), a mild-to-moderate fall in hematocrit (seven patients), and a small subcapsular hematoma (one patient). One major complication occurred in the control group: a patient required a blood transfusion because of the fall in his hematocrit. We conclude that the complication rate in liver biopsies guided by CT or sonography in the presence of ascites is not higher than similar biopsies done in the absence of ascites. Ascites should not be considered a contraindication for performing such biopsies. 相似文献
65.
Irwin L. Flink 《Brain structure & function》2002,205(3):235-244
66.
67.
Michael K. Gardner Elaine Clark Mary Ann C. Bowman Patrick J. Miller 《Alcoholism, clinical and experimental research》1989,13(4):508-511
This study investigated analogical reasoning abilities of alcoholics who had been abstinent from alcohol for at least 1 year. Their performance was compared to that of nonalcoholic controls matched as a group for education, age, and gender. Solution times and error rates were modeled using a regression model. Results showed a nonsignificant trend for alcoholics to be faster, but more error prone, than controls. The same componential model applied to both groups, and fit them equally well. Although differences have been found in analogical reasoning ability between controls and alcoholics immediately following detoxification, we find no evidence of differences after extended periods of sobriety. 相似文献
68.
We have systematically investigated the involvement of endogenous opioids in gonadotropin secretion during primate sexual maturation by examining LH/FSH responses to gonadotropin-releasing hormone (GnRH) and changes in LH secretion during infusions of saline or naloxone, an opiate antagonist, in ten male chimpanzees between one and nine years of age. Animals were anesthetized with ketamine (10 mg/kg) and injected or infused IV with GnRH, naloxone or saline. Circulating levels of serum LH were elevated to the same extent (approximately 400%) in response to GnRH (100 micrograms) in animals 1-5 years old (juvenile) and in animals 6-9 years old (pubertal). No differences were noted between the two groups in GnRH-stimulated levels of serum FSH. During treatment with naloxone (0.14 mg/kg bolus followed by 0.2 mg/kg/h maintenance infusion for 3 h), serum LH levels in pubertal animals were significantly (p less than 0.05) elevated by as much as 95% over LH levels found during treatment with saline. Juvenile animals, on the other hand, failed to demonstrate significant increases in serum LH following naloxone at the doses tested. A strong correlation (r = .84) was found between circulating testosterone and serum LH levels during naloxone treatment. These data indicate that opioid inhibition of LH secretion can be reversed by naloxone only when puberty is reached in chimpanzees and suggest an alteration in opioid regulation of GnRH near the time of puberty. The strong correlation between testosterone levels and LH responses to naloxone suggests that steroids may participate in the maturation of opioid control of LH during puberty of nonhuman primates. 相似文献
69.
70.