全文获取类型
收费全文 | 62572篇 |
免费 | 3734篇 |
国内免费 | 225篇 |
专业分类
耳鼻咽喉 | 708篇 |
儿科学 | 1746篇 |
妇产科学 | 1266篇 |
基础医学 | 7902篇 |
口腔科学 | 1215篇 |
临床医学 | 8073篇 |
内科学 | 12880篇 |
皮肤病学 | 772篇 |
神经病学 | 5158篇 |
特种医学 | 1542篇 |
外国民族医学 | 1篇 |
外科学 | 7503篇 |
综合类 | 482篇 |
一般理论 | 50篇 |
预防医学 | 6290篇 |
眼科学 | 960篇 |
药学 | 3970篇 |
中国医学 | 110篇 |
肿瘤学 | 5903篇 |
出版年
2023年 | 427篇 |
2022年 | 674篇 |
2021年 | 1241篇 |
2020年 | 827篇 |
2019年 | 1230篇 |
2018年 | 1504篇 |
2017年 | 1126篇 |
2016年 | 1249篇 |
2015年 | 1336篇 |
2014年 | 1846篇 |
2013年 | 2717篇 |
2012年 | 3991篇 |
2011年 | 4307篇 |
2010年 | 2308篇 |
2009年 | 2053篇 |
2008年 | 3710篇 |
2007年 | 3828篇 |
2006年 | 3744篇 |
2005年 | 3739篇 |
2004年 | 3474篇 |
2003年 | 3238篇 |
2002年 | 3048篇 |
2001年 | 1122篇 |
2000年 | 1105篇 |
1999年 | 1129篇 |
1998年 | 721篇 |
1997年 | 567篇 |
1996年 | 509篇 |
1995年 | 407篇 |
1994年 | 391篇 |
1993年 | 368篇 |
1992年 | 811篇 |
1991年 | 731篇 |
1990年 | 661篇 |
1989年 | 747篇 |
1988年 | 640篇 |
1987年 | 586篇 |
1986年 | 599篇 |
1985年 | 554篇 |
1984年 | 402篇 |
1983年 | 309篇 |
1982年 | 222篇 |
1981年 | 197篇 |
1980年 | 178篇 |
1979年 | 260篇 |
1978年 | 202篇 |
1977年 | 173篇 |
1974年 | 125篇 |
1971年 | 126篇 |
1969年 | 132篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Daniel J. Ureche Jordan P. Davis Karen M. Tabb 《Journal of ethnicity in substance abuse》2016,15(2):176-188
Obtaining accurate assessment data from adolescents in treatment aids clinical decision making and facilitates more accurate outcome evaluations. However, findings could be biased due to underreported substance use and mental health symptoms. This article compares self-reports of youth in non-White matched client–assessor dyads and those in nonmatched dyads. There were no differences on self-reported substance use, but matched youth reported significantly fewer attention deficit/hyperactivity disorder symptoms versus the comparison group. One possible reason for these findings is the effect of in-group stereotype threat. Future studies should examine the potential effect that in-group stereotyping and perceived racism have on the therapeutic relationship. 相似文献
6.
Megan L. Robbins Robert C. Wright Ana María López Karen Weihs 《Journal of psychosocial oncology》2019,37(2):160-177
AbstractObjectives: This study examined word use as an indicator of interpersonal positive reframing in daily conversations of couples coping with breast cancer and as a predictor of stress.Design: The Electronically Activated Recorder (EAR) and Linguistic Inquiry and Word Count (LIWC) were used to examine naturally occurring word use conceptually linked to positive reframing (positive emotion, negative emotion, and cognitive processing words).Sample: Fifty-two couples coping with breast cancer.Methods: Couples wore the EAR, a device participants wear, that audio-recorded over one weekend (>16,000 sound files), and completed self-reports of positive reframing (COPE) and stress (Perceived Stress Scale). LIWC, a software program, measured word use.Findings: Both partners’ word use (i.e., positive emotion and cognitive processing words) was associated with their own reported positive reframing, and spouses’ word use was also indicative of patients’ positive reframing. Results also revealed that, in general, words indicating positive reframing predicted lower levels of stress.Conclusions: Findings supported the hypothesis that partners—and particularly spouses of breast cancer patients—may assist each other’s coping by positively reframing the cancer experience and other negative experiences in conversation. 相似文献
7.
8.
Fluid role boundaries: exploring the contribution of the advanced nurse practitioner to multi‐professional palliative care 下载免费PDF全文
9.
Jun Agata Nobuyuki Ura Hideaki Yoshida Yasuyuki Shinshi Haruki Sasaki Masaya Hyakkoku Shinya Taniguchi Kazuaki Shimamoto 《Hypertension research》2006,29(11):865-874
Angiotensin II receptor blockers (ARBs) are widely used for the treatment of hypertension. It is believed that treatment with an ARB increases the level of plasma angiotensin II (Ang II) because of a lack of negative feedback on renin activity. However, Ichikawa (Hypertens Res 2001; 24: 641-646) reported that long-term treatment of hypertensive patients with olmesartan resulted in a reduction in plasma Ang II level, though the mechanism was not determined. It has been reported that angiotensin 1-7 (Ang-(1-7)) potentiates the effect of bradykinin and acts as an angiotensin-converting enzyme (ACE) inhibitor. It is known that ACE2, which was discovered as a novel ACE-related carboxypeptidase in 2000, hydrolyzes Ang I to Ang-(1-9) and also Ang II to Ang-(1-7). It has recently been reported that olmesartan increases plasma Ang-(1-7) through an increase in ACE2 expression in rats with myocardial infarction. We hypothesized that over-expression of ACE2 may be related to a reduction in Ang II level and the cardioprotective effect of olmesartan. Administration of 0.5 mg/kg/day of olmesartan for 4 weeks to 12-week-old stroke-prone spontaneously hypertensive rats (SHRSP) significantly reduced blood pressure and left ventricular weight compared to those in SHRSP given a vehicle. Co-administration of olmesartan and (D-Ala7)-Ang-(1-7), a selective Ang-(1-7) antagonist, partially inhibited the effect of olmesartan on blood pressure and left ventricular weight. Interestingly, co-administration of (D-Ala7)-Ang-(1-7) with olmesartan significantly increased the plasma Ang II level (453.2+/-113.8 pg/ml) compared to olmesartan alone (144.9+/-27.0 pg/ml, p<0.05). Moreover, olmesartan significantly increased the cardiac ACE2 expression level compared to that in Wistar Kyoto rats and SHRSP treated with a vehicle. Olmesartan significantly improved cardiovascular remodeling and cardiac nitrite/ nitrate content, but co-administration of olmesartan and (D-Ala7)-Ang-(1-7) partially reversed this anti-remodeling effect and the increase in nitrite/nitrate. These findings suggest that olmesartan may exhibit an ACE inhibitory action in addition to an Ang II receptor blocking action, prevent an increase in Ang II level, and protect cardiovascular remodeling through an increase in cardiac nitric oxide production and endogenous Ang-(1-7) via over-expression of ACE2. 相似文献
10.
Karen Bogenschneider 《Family relations》2006,55(1):16-28
Abstract: As newcomers on college campuses, family policy courses have the potential to benefit policymaking, fill a void in undergraduate and graduate education, strengthen families, and prepare students for lifelong political engagement during a pivotal period in their development. Yet, family policy has proven a challenging course to teach. Family policy is an esoteric concept, which makes courses difficult to distinguish from other policy courses. The content of a family policy course is fluid and inherently value laden. This paper proposes course content and teaching techniques to transform these challenges into learning opportunities. The author discusses similarities and differences in teaching undergraduate and graduate courses and recommends cross‐university dialogue and resource exchange to improve the teaching of family policy in college classrooms. 相似文献