全文获取类型
收费全文 | 9019篇 |
免费 | 499篇 |
国内免费 | 16篇 |
专业分类
耳鼻咽喉 | 44篇 |
儿科学 | 290篇 |
妇产科学 | 226篇 |
基础医学 | 1094篇 |
口腔科学 | 57篇 |
临床医学 | 1638篇 |
内科学 | 1401篇 |
皮肤病学 | 97篇 |
神经病学 | 950篇 |
特种医学 | 159篇 |
外科学 | 723篇 |
综合类 | 86篇 |
一般理论 | 11篇 |
预防医学 | 1332篇 |
眼科学 | 103篇 |
药学 | 722篇 |
中国医学 | 7篇 |
肿瘤学 | 594篇 |
出版年
2024年 | 7篇 |
2023年 | 31篇 |
2022年 | 83篇 |
2021年 | 168篇 |
2020年 | 93篇 |
2019年 | 180篇 |
2018年 | 175篇 |
2017年 | 149篇 |
2016年 | 171篇 |
2015年 | 204篇 |
2014年 | 313篇 |
2013年 | 475篇 |
2012年 | 681篇 |
2011年 | 689篇 |
2010年 | 379篇 |
2009年 | 350篇 |
2008年 | 635篇 |
2007年 | 624篇 |
2006年 | 640篇 |
2005年 | 631篇 |
2004年 | 612篇 |
2003年 | 600篇 |
2002年 | 516篇 |
2001年 | 79篇 |
2000年 | 50篇 |
1999年 | 87篇 |
1998年 | 105篇 |
1997年 | 71篇 |
1996年 | 75篇 |
1995年 | 77篇 |
1994年 | 49篇 |
1993年 | 50篇 |
1992年 | 35篇 |
1991年 | 48篇 |
1990年 | 30篇 |
1989年 | 40篇 |
1988年 | 40篇 |
1987年 | 25篇 |
1986年 | 19篇 |
1985年 | 29篇 |
1984年 | 31篇 |
1983年 | 19篇 |
1982年 | 27篇 |
1981年 | 24篇 |
1980年 | 22篇 |
1979年 | 17篇 |
1978年 | 20篇 |
1977年 | 12篇 |
1975年 | 8篇 |
1974年 | 11篇 |
排序方式: 共有9534条查询结果,搜索用时 15 毫秒
31.
32.
Cheryl Tilse Jill Wilson Deborah Setterlund Linda Rosenman 《Australasian journal on ageing》2005,24(Z1):S51-S56
The management of the financial assets of older people is increasingly important in the current policy context. Competing interests from the state, the market and the family regarding the appropriate use of these assets suggest that non‐professional managers are assisting older people in a complex environment. This paper, based on a national prevalence study and an in‐depth study, explores the nature and extent of asset management on behalf of older people. It examines the role of legal provision for substitute decision‐making in these processes and concludes that the current provision is insufficient to protect older people from financial abuse and support carers to manage assets well. This paper proposes that more broadly based interventions are required in a complex environment of competing interests. Such interventions include attitudinal change, improved financial literacy, information and support for older people and informal asset managers and improved monitoring and support for substitute decision makers. 相似文献
33.
Receptive Properties of Mouse Sensory Neurons Innervating Hairy Skin 总被引:15,自引:0,他引:15
Koltzenburg Martin; Stucky Cheryl L.; Lewin Gary R. 《Journal of neurophysiology》1997,78(4):1841-1850
34.
35.
Yifat Cohen Anthony Spirito Cheryl Sterling Deidre Donaldson Ronald Seifer Barry Plummer Ruscinda Avila Kathy Ferrer 《Journal of child psychology and psychiatry, and allied disciplines》1996,37(8):989-993
Adolescents who were psychiatrically hospitalized ( N = 105) were classified as sexually abused, physically abused, both sexually and physically abused, or not abused, and studied to determine the prevalence of suicidal behavior and psychiatric disorders. Self-reports of hopelessness, depression, coping, and self-concept were also examined. No difference in suicidal behavior or psychiatric disorder, based on abuse history, was found, with one exception. Adolescents who were sexually abused, particularly those who experienced the most severe sexual abuse, used negative coping strategies more often than those not sexually abused. Findings suggest that symptomatology of adolescents who are psychiatrically hospitalized does not differ markedly based on history of abuse. 相似文献
36.
Cheryl A. Cameron PhD JD C. Scott Litch JD MA Martha Liggett JD MS Steven Heimberg MD JD 《Special care in dentistry》1995,15(5):192-200
This paper examines medical malpractice law as it applies to medically necessary oral health care. The basic legal concepts and reported cases involving medically necessary oral health care are reviewed. It is concluded that dental professionals and consumer advocates must advance their educational and legislative advocacy efforts so that health professional colleagues and the public will become aware of the importance of these services and insurers will routinely include coverage of medically necessary oral health care in their medical and dental policies. While failure to provide medically necessary oral health care can be violative of patient rights and legally actionable, medical malpractice litigation should always be the behavior modifier of last resort. 相似文献
37.
Rosenberg Leonard S. Hostetler Cheryl K. Wagenknecht Dietmar M. Aunet Diane A. 《Pharmaceutical research》1988,5(8):514-517
Esmolol hydrochloride degrades in aqueous solutions by the hydrolysis of a labile aliphatic carboxy-ester group. The products are methanol and ASL-8123. The resulting aliphatic carboxylic acid moiety (ASL-8123) has a pK of 4.80, which is within 1 pH unit of the pH of the formulation. ASL-8123 therefore acts as a secondary buffer and minimizes the change in pH due to degradation. Equations are presented to calculate the change in the pH when the primary degradation product acts as a secondary buffer. This information can be used in the development of a parenteral product to predict, a priori, the concentration of buffer necessary for optimal pH maintenance. This knowledge can reduce the number of formulation screens required to determine the necessary buffer capacity for optimal drug stability. 相似文献
38.
Rats with lesions of the area postrema (APX) are known to exhibit an enhanced intake of highly palatable foods such as sweetened condensed milk and cookies. These observations suggest the possibility that APX rats find these foods more rewarding and will work harder to obtain these foods. Sham and APX rats were tested on fixed ratio (FR) and progressive ratio (PR) schedules. APX rats consistently pressed more times to receive sucrose solution and attained both FR 3 and FR 5 criteria significantly faster than sham-lesioned control rats. Furthermore, rats with APX had significantly higher break points than sham-lesioned control rats on a progressive ratio schedule. These results support the hypothesis that rats with lesions of the area postrema will consistently work harder to obtain a highly palatable food reward. 相似文献
39.
Cannabinoids have been shown to influence food intake, and until recently, the neural pathways mediating these effects have remained obscure. It has been previously shown that intracerebroventricular injection of delta-9-tetrahydrocannabinol (Δ9-THC) causes increased consumption of palatable foods in rats, and we postulated the involvement of the hindbrain in this cannabinoid-induced food intake. Cannulated rats (both female and male groups) trained to consume sweetened condensed milk received either lateral or fourth ventricle injections of CP 55,940 and were presented with sweetened condensed milk 15 min after injection. Rats were injected over a range of doses between 100 pg and 10 μg per rat. Milk intake was recorded for a total of 3 h. Lateral ventricle injection of CP 55,940 increased milk intake at doses in the microgram range. However, CP 55,940 was effective in increasing food intake at nanogram doses when injected into the fourth ventricle. Finally, male rats appeared to be more sensitive to CP 55,940 than female rats inasmuch as milk consumption was increased at the 1 ng dose in male rats, whereas only the 10 ng dose was effective in females. These results indicate that CP 55,940 may act in the hindbrain to influence feeding behavior in rats. 相似文献
40.
Pendergast D Zamparo P di Prampero PE Capelli C Cerretelli P Termin A Craig A Bushnell D Paschke D Mollendorf J 《European journal of applied physiology》2003,90(3-4):377-386
In this paper a complete energy balance for water locomotion is attempted with the aim of comparing different modes of transport in the aquatic environment (swimming underwater with SCUBA diving equipment, swimming at the surface: leg kicking and front crawl, kayaking and rowing). On the basis of the values of metabolic power (Ė), of the power needed to overcome water resistance (d) and of propelling efficiency (P=d/tot, where tot is the total mechanical power) as reported in the literature for each of these forms of locomotion, the energy cost per unit distance (C=Ė/v, where v is the velocity), the drag (performance) efficiency (d=d/Ė) and the overall efficiency (o=tot/Ė=d/P) were calculated. As previously found for human locomotion on land, for a given metabolic power (e.g. 0.5 kW=1.43 l·min–1 O2) the decrease in C (from 0.88 kJ·m–1 in SCUBA diving to 0.22 kJ·m–1 in rowing) is associated with an increase in the speed of locomotion (from 0.6 m·s–1 in SCUBA diving to 2.4 m·s–1 in rowing). At variance with locomotion on land, however, the decrease in C is associated with an increase, rather than a decrease, of the total mechanical work per unit distance (Wtot, kJ·m–1). This is made possible by the increase of the overall efficiency of locomotion (o=tot/Ė=Wtot/C) from the slow speeds (and loads) of swimming to the high speeds (and loads) attainable with hulls and boats (from 0.10 in SCUBA diving to 0.29 in rowing). 相似文献