首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1679篇
  免费   199篇
  国内免费   34篇
耳鼻咽喉   4篇
儿科学   74篇
妇产科学   107篇
基础医学   259篇
口腔科学   24篇
临床医学   138篇
内科学   372篇
皮肤病学   26篇
神经病学   106篇
特种医学   141篇
外科学   131篇
综合类   117篇
一般理论   4篇
预防医学   164篇
眼科学   20篇
药学   153篇
中国医学   3篇
肿瘤学   69篇
  2021年   18篇
  2019年   21篇
  2018年   33篇
  2017年   19篇
  2016年   18篇
  2015年   25篇
  2014年   23篇
  2013年   40篇
  2012年   67篇
  2011年   64篇
  2010年   38篇
  2009年   36篇
  2008年   65篇
  2007年   78篇
  2006年   74篇
  2005年   71篇
  2004年   35篇
  2003年   48篇
  2002年   35篇
  2001年   36篇
  2000年   50篇
  1999年   50篇
  1998年   39篇
  1997年   33篇
  1996年   40篇
  1995年   34篇
  1994年   27篇
  1993年   29篇
  1992年   39篇
  1991年   41篇
  1990年   28篇
  1989年   59篇
  1988年   44篇
  1987年   41篇
  1986年   37篇
  1985年   39篇
  1984年   38篇
  1983年   37篇
  1982年   34篇
  1981年   26篇
  1980年   21篇
  1979年   22篇
  1978年   20篇
  1977年   27篇
  1976年   16篇
  1975年   23篇
  1973年   18篇
  1972年   16篇
  1971年   13篇
  1969年   17篇
排序方式: 共有1912条查询结果,搜索用时 11 毫秒
101.
102.
Giant cell arteritis (GCA) is a disease of unknown etiology characterized by granulomatous inflammation of medium and large arteries. A 69-year-old man presented with right jaw claudication, intermittent scalp tenderness without headache, and visibly swollen temporal arteries. Results of a right temporal artery biopsy were positive for GCA. Auscultation revealed audible bruits of the temporal arteries. We believe this is the first reported example of bruits of the temporal arteries as a manifestation of GCA. The condition resolved with corticosteroid therapy.  相似文献   
103.
Na(+)-Ca(2+) exchange (NCX) is crucial in the regulation of [Ca(2+)](i) and cardiac contractility, but key details of its dynamic function during the heartbeat are not known. In the present study, we assess how NCX current (I(NCX)) varies during a rabbit ventricular action potential (AP). First, we measured the steady-state voltage and [Ca(2+)](i) dependence of I(NCX) under conditions when [Ca(2+)](i) was heavily buffered. We then used this relationship to infer the submembrane [Ca(2+)](i) ([Ca(2+)](sm)) sensed by NCX during a normal AP and [Ca(2+)](i) transient (when the AP was interrupted to produce an I(NCX) tail current). The [Ca(2+)](i) dependence of I(NCX) at -90 mV allowed us to convert the peak inward I(NCX) tail currents to [Ca(2+)](sm). Peak [Ca(2+)](sm) measured via this technique was >3.2 micromol/L within < 32 ms of the AP upstroke (versus peak [Ca(2+)](i) of 1.1 micromol/L at 81 ms measured with the global Ca(2+) indicator indo-1). The voltage and [Ca(2+)](sm) dependence of I(NCX) allowed us to infer I(NCX) during the normal AP and Ca(2+) transient. The early rise in [Ca(2+)](sm) causes I(NCX) to be inward for the majority of the AP. Thus, little Ca(2+) influx via NCX is expected under physiological conditions, but this can differ among species and in pathophysiological conditions.  相似文献   
104.
105.

Background  

The Major Depression Inventory (MDI) is a brief self-rating scale for the assessment of depression. It is reported to be valid because it is based on the universe of symptoms of DSM-IV and ICD-10 depression. The aim of the current preliminary study was to assess the reliability, validity and psychometric properties of the Greek translation of the MDI.  相似文献   
106.
In vitro fertilization for cancer patients and survivors   总被引:8,自引:0,他引:8  
OBJECTIVE: To determine in vitro fertilization (IVF) outcome in cancer patients. DESIGN: Retrospective record review. SETTING: Academic, hospital-based assisted reproductive technology (ART) program. PATIENT(S): Sixty-nine women undergoing 113 IVF/gamete intrafallopian transfer (GIFT) cycles after cancer treatment in one partner, and 13 women undergoing 13 IVF cycles for embryo cryopreservation before chemotherapy/radiation. INTERVENTION(S): IVF, intracytoplasmic sperm injection (ICSI), assisted hatching, and gamete intrafallopian transfer as indicated. MAIN OUTCOME MEASURE(S): Delivery rate, spontaneous abortion rate, number of embryos cryopreserved, cancer diagnosis, systemic or local cancer treatment, female age, amount of gonadotropin used, treatment duration, peak estradiol level, and number of oocytes and embryos. RESULT(S): The women undergoing IVF after chemotherapy had poorer responses to gonadotropins than did the women with locally treated cancers even though they were younger (33.5 +/- 1.3 vs. 36.5 +/- 0.5 years; P<.05). The delivery rates after the women had undergone chemotherapy tended to be lower among the systemic treatment group than it was for the local cancer treatment group: (13.3% [2 of 15] vs. 40% [14 of 56, P=NS]). The women who had cryopreserved all embryos before chemotherapy produced more oocytes (18.7 +/- 3.2 vs. 14.5 +/- 1.2) and embryos (11.3 +/- 1.9 vs. 7.5 +/- 0.7) than did the women who had had a history of local cancer treatment. Male factor infertility as a result of cancer treatment is well treated with IVF or intracytoplasmic sperm injection, where indicated (32% delivery rate/cycle), with no difference between the frozen sperm banked before cancer treatment and fresh sperm produced after treatment. CONCLUSION(S): Chemotherapy diminishes the response to ovulation induction in assisted reproductive technologies. IVF with cryopreservation of embryos allows embryo banking before chemotherapy for women who have been newly diagnosed with cancer. Factors related to the partner affect the success of IVF for male factor infertility as a result of cancer treatment.  相似文献   
107.
Patient satisfaction is an important outcome measure independent of other outcomes. Its measurement is important to assess the effectiveness of a programme and to gain insight into the patients'' perception of the programme. In this study conducted in a large rehabilitation centre it was found that majority of patients express satisfaction with care inspite of perceived discomfort. Various demographic factors, severity or duration of the disability or the level of rehabilitation do not influence patient satisfaction. Patients express more concern with aspects such as delay in issue of the prosthesis, or hotel component of the hospital services. Patients did not appear too concerned about the level of information provided. Patient satisfaction is an individual reaction to the overall care process and is influenced by the initial expectation level of the patient. Emotional response of the patient appears to be more important determinant of patient satisfaction than the cognitive evaluation. Periodical assessment of patient satisfaction should be an important component of any programme evaluation exercise.KEY WORDS: Amputation, Patient satisfaction, Programme evaluation, Prosthesis, Quality of care, Rehabilitation  相似文献   
108.
109.
This paper examines trends in out-of-pocket spending for insured workers from 1990 to 1997. Data are from the Consumer Expenditure Survey conducted by the U.S. Bureau of Labor Statistics. The survey collects detailed quarterly data on all consumer spending from logs kept each year by more than 10,000 households with job-based health insurance. During the study period, total out-of-pocket spending in constant dollars remained unchanged. Spending for medical expenses, drugs, and supplies declined by 23 percent, but this decline was offset by rising employee contributions for health insurance premiums. The shift to managed care, whose benefit structure requires less cost sharing, may have played a role in reducing out-of-pocket spending.  相似文献   
110.
OBJECTIVE: To demonstrate that employees can gain understanding of the financial constraints involved in designing health insurance benefits. BACKGROUND: While employees who receive their health insurance through the workplace have much at stake as the cost of health insurance rises, they are not necessarily prepared to constructively participate in prioritizing their health insurance benefits in order to limit cost. DESIGN: Structured group exercises. SETTING AND PARTICIPANTS: Employees of 41 public and private organizations in Northern California. INTERVENTION: Administration of the CHAT (Choosing Healthplans All Together) exercise in which participants engage in deliberation to design health insurance benefits under financial constraints. MAIN OUTCOME MEASURES: Change in priorities and attitudes about the need to exercise insurance cost constraints. RESULTS: Participants (N = 744) became significantly more cognizant of the need to limit insurance benefits for the sake of affordability and capable of prioritizing benefit options. Those agreeing that it is reasonable to limit health insurance coverage given the cost increased from 47% to 72%. CONCLUSION: It is both possible and valuable to involve employees in priority setting regarding health insurance benefits through the use of structured decision tools.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号