全文获取类型
收费全文 | 55582篇 |
免费 | 3480篇 |
国内免费 | 110篇 |
专业分类
耳鼻咽喉 | 529篇 |
儿科学 | 2296篇 |
妇产科学 | 1514篇 |
基础医学 | 6945篇 |
口腔科学 | 540篇 |
临床医学 | 8544篇 |
内科学 | 9519篇 |
皮肤病学 | 756篇 |
神经病学 | 5329篇 |
特种医学 | 974篇 |
外科学 | 4613篇 |
综合类 | 589篇 |
一般理论 | 109篇 |
预防医学 | 7764篇 |
眼科学 | 760篇 |
药学 | 3634篇 |
中国医学 | 61篇 |
肿瘤学 | 4696篇 |
出版年
2023年 | 290篇 |
2022年 | 432篇 |
2021年 | 1016篇 |
2020年 | 693篇 |
2019年 | 1050篇 |
2018年 | 1203篇 |
2017年 | 977篇 |
2016年 | 1058篇 |
2015年 | 1237篇 |
2014年 | 1711篇 |
2013年 | 2730篇 |
2012年 | 3930篇 |
2011年 | 4240篇 |
2010年 | 2356篇 |
2009年 | 2127篇 |
2008年 | 3833篇 |
2007年 | 4076篇 |
2006年 | 3928篇 |
2005年 | 4068篇 |
2004年 | 3863篇 |
2003年 | 3637篇 |
2002年 | 3351篇 |
2001年 | 469篇 |
2000年 | 344篇 |
1999年 | 470篇 |
1998年 | 685篇 |
1997年 | 608篇 |
1996年 | 479篇 |
1995年 | 481篇 |
1994年 | 425篇 |
1993年 | 338篇 |
1992年 | 244篇 |
1991年 | 207篇 |
1990年 | 187篇 |
1989年 | 196篇 |
1988年 | 186篇 |
1987年 | 169篇 |
1986年 | 162篇 |
1985年 | 163篇 |
1984年 | 186篇 |
1983年 | 169篇 |
1982年 | 216篇 |
1981年 | 207篇 |
1980年 | 155篇 |
1979年 | 94篇 |
1978年 | 112篇 |
1977年 | 52篇 |
1976年 | 57篇 |
1975年 | 45篇 |
1974年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Ellen A. Eisen Paige E. Tolbert Marilyn F. Hallock Richard R. Monson Thomas J. Smith Susan R. Woskie 《American journal of industrial medicine》1994,26(2):185-202
A case-control study of larynx cancer was conducted within a cohort of automobile workers exposed to metal working fluids, commonly referred to as machining fluids (MF). Results are based on 108 cases of larynx cancer and 5:1 matched controls. Risks associated with specific types of MF, as well as specific components of the fluids were evaluated. Based on a retrospective exposure assessment, lifetime exposures to straight and soluble fluids, grinding particulate, biocides, selected metals, sulfur, and chlorine were examined. Exposure to asbestos and acid mists at two of the three study sites was also characterized. Results suggest that straight mineral oils are associated with almost a two-fold excess in larynx cancer risk. There was also evidence of an association with elemental sulfur, commonly added to straight MF to improve the integrity of the materials under extreme pressure and heat. It is not clear whether sulfur is causally related to an excess relative risk of larynx cancer or whether the observed association is the result of unmeasured confounding by another contaminant or process feature. For example, the high stress operations that require MF enriched with sulfur are also more likely to produce polycyclic aromatic hydrocarbons (PAHs) during the process. Thus, the observed association with sulfur may be due to an association with PAH. The finding of excess risk of laryngeal cancer associated with MF is consistent with several previous reports in the literature. This is the first study, however, to distinguish straight mineral oils from other types of MF. Based on these findings, a general reduction in concentrations of straight mineral oil particulate in occupational environments would be prudent. 相似文献
82.
Christiane Eckhardt Jesse S Halvosa Susan M Ray Henry M Blumberg 《Infection control and hospital epidemiology》2003,24(6):460-461
Methicillin-resistant Staphylococcus aureus (MRSA) has traditionally been a nosocomial pathogen. However, several recent studies have noted community-acquired MRSA among young, healthy patients with no risk factors or healthcare system exposure. We report the transmission of a strain of community-acquired MRSA in our neonatal intensive care unit. 相似文献
83.
84.
A review of the literature on gender identity disorders is integrated with a case study presentation of a psychiatrically
disturbed nineteen-year-old transvestite youth. Accommodations and interventions made both with this patient and in the day
care program for psychiatrically disturbed youths that allowed him to live at home and be maintained despite severe pathology
are discussed.
Amaro Reyes, M.D. was formerly an attending Psychiatrist in the Community Division of Bronx Children's Psychiatric Center 相似文献
85.
Kay Teschke Susan M. Kennedy Andrew F. Olshan 《American journal of industrial medicine》1994,26(3):327-337
During an exposure monitoring study, 78 saw maintenance tradesmen were randomly assigned to be interviewed about their exposures using one of two questionnaire formats: open-ended and partly prompted questions about five categories of materials; and detailed prompting about 75 agents. The more open-ended questionnaire elicited fewer exposure responses overall, but more responses about agents not included on the detailed questionnaire. Composite materials and trade name products were more frequently cited as exposures than individual metals or compounds. Validity of responses was ascertained using air measurements (individual metals) or observations of the employees (composite materials). Sums of sensitivities and specificities were very low (near 1.0) for most of the metals for both types of questionnaire. For composite materials, validity improved substantially. Sensitivities with the partly prompted format (0.44–0.85) were always lower than with detailed prompting (0.80–1.00). Specificities were usually, but not always, higher with partial prompting (0.66–0.92) than with detailed prompting (0.18–0.86). Selection of questionnaire format for an epidemiologic study would depend on the likely prevalence of exposure in controls and the effects of trade-offs in sensitivity and specificity. 相似文献
86.
87.
88.
Mark T. DeMeo M.D Sohrab Mobarhan M.D Ms. Susan Mikolaitis R.D. C.N.S.D Dr. Nadeem Kazi M.D 《Nutrition reviews》1997,55(8):297-302
The effect of weight loss with anorectic medications on sleep apnea, non-insulin-dependent diabetes, and steatohepatitis is illustrated in three cases from practice in a clinical nutrition setting. Prevention of obesity, a chronic disorder, is preferable, but when obesity becomes a major obstacle in the care of patients with respiratory, cardiovascular, and metabolic disorders and osteoarthritis, an intense course of weight reduction using anorectic medications under medical and dietetic guidance is essential for patients' survival and reduction of medical cost. 相似文献
89.
Justin W. Phillpott M.D. Leonard E. Swischuk M.D. Susan D. John M.D. 《Emergency radiology》1997,4(2):68-71
We reviewed plain radiographs of 215 pediatric patients with surgically proven appendicitis to study the value of plain radiography for diagnosis. 相似文献
90.
Clinical trial of a prevention and treatment protocol for skin breakdown in two nursing homes. 总被引:1,自引:0,他引:1
Susan Hunter Julie Anderson Darlene Hanson Patricia Thompson Diane Langemo Marilyn G Klug 《Journal of wound, ostomy, and continence nursing》2003,30(5):250-258
OBJECTIVE: Our objective was to assess the effectiveness of skin care protocols, including a body wash and skin protectant, on skin breakdown in 2 nursing homes. DESIGN: This was a quasi-experimental pretest/posttest design study.Setting and subjects Adult residents (n = 136) of 2 skilled nursing homes consented to participate in this study. Seventy percent were women; the sample average age of 82 years. INSTRUMENTS: A researcher-designed data recording form documented resident demographics, incidence and type of skin breakdown or pressure ulcer, presence of urinary or fecal incontinence, and assessment of the effectiveness of body wash and skin protectant. METHODS: Baseline data on prevalence of pressure ulcers and skin protocol were collected weekly for a 3-month period followed by a week-long educational program by the researchers about skin care and the body wash and skin protectant. During the 3-month trial with the body wash and skin protectant incorporated into routine care, research assistants recorded resident data weekly and researchers again assessed prevalence and incidence of pressure ulcers and skin breakdown weekly. RESULTS: Incorporation of a body wash and skin protectant into a skin care prevention and early intervention protocol in 2 nursing homes documented a decrease in skin breakdowns from 68 pre-intervention to 40 postintervention; the decrease in agency B was statistically significant. There was a statistically significant decrease in stage I and II pressure ulcer incidence overall (pre-intervention = 19.9%, postintervention = 8.1%). Nurses evaluated the body wash and skin protectant as effective for 98% of the time used. CONCLUSION: Implementation of a protocol for skin care along with staff education, including the prophylactic use of a body wash and skin protectant, reduced the incidence of skin breakdown, including pressure ulcers and perineal dermatitis, in 2 long-term care facilities. 相似文献