全文获取类型
收费全文 | 21176篇 |
免费 | 1871篇 |
国内免费 | 30篇 |
专业分类
耳鼻咽喉 | 191篇 |
儿科学 | 639篇 |
妇产科学 | 421篇 |
基础医学 | 2843篇 |
口腔科学 | 552篇 |
临床医学 | 2556篇 |
内科学 | 4290篇 |
皮肤病学 | 269篇 |
神经病学 | 2093篇 |
特种医学 | 624篇 |
外国民族医学 | 3篇 |
外科学 | 2312篇 |
综合类 | 417篇 |
一般理论 | 24篇 |
预防医学 | 2379篇 |
眼科学 | 450篇 |
药学 | 1533篇 |
中国医学 | 12篇 |
肿瘤学 | 1469篇 |
出版年
2022年 | 178篇 |
2021年 | 395篇 |
2020年 | 247篇 |
2019年 | 413篇 |
2018年 | 410篇 |
2017年 | 338篇 |
2016年 | 372篇 |
2015年 | 411篇 |
2014年 | 553篇 |
2013年 | 727篇 |
2012年 | 1145篇 |
2011年 | 1121篇 |
2010年 | 607篇 |
2009年 | 512篇 |
2008年 | 991篇 |
2007年 | 990篇 |
2006年 | 991篇 |
2005年 | 951篇 |
2004年 | 945篇 |
2003年 | 894篇 |
2002年 | 768篇 |
2001年 | 615篇 |
2000年 | 611篇 |
1999年 | 541篇 |
1998年 | 250篇 |
1997年 | 205篇 |
1996年 | 186篇 |
1995年 | 220篇 |
1994年 | 182篇 |
1993年 | 183篇 |
1992年 | 469篇 |
1991年 | 426篇 |
1990年 | 435篇 |
1989年 | 414篇 |
1988年 | 341篇 |
1987年 | 338篇 |
1986年 | 289篇 |
1985年 | 286篇 |
1984年 | 213篇 |
1983年 | 214篇 |
1982年 | 167篇 |
1981年 | 136篇 |
1980年 | 145篇 |
1979年 | 219篇 |
1978年 | 160篇 |
1977年 | 140篇 |
1976年 | 148篇 |
1974年 | 144篇 |
1973年 | 165篇 |
1972年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Lucy Kean 《Current Obstetrics & Gynaecology》2006,16(4):199-205
Sadly, intrauterine fetal death is a common occurrence and one that all labour ward personnel should be trained to manage. Recent advances have improved the likelihood of identifying a cause. The key to this is a logical and methodical approach to investigation. Postmortem examination remains a critical aspect of investigation and labour ward teams require a clear understanding of the legal aspects of this. Sympathetic and supportive care of parents should respect parental wishes and allow choice wherever possible. However, maternal safety should also be a central aspect of this care. 相似文献
82.
83.
84.
85.
Homicide inflicts massive injury upon the intrapsychic and interpersonal realities of the surviving kin of murder victims. A New York City pilot program of outreach and counselling to 1182 families of Brooklyn homicide victims suggests that surviving kin undergo the symptoms of traumatic stress disorder. Recovery is prolonged by knowledge that the perpetrator is usually alive and in some cases unpunished, by repetitive confrontations with the criminal justice system and by the multiple losses endured: loss of a family member, loss of illusions of safety and invulnerability, loss of a sense of trust in the surrounding community, and loss of a belief system. Effective help to survivors requires interventions that respond to all aspects of the survivors' losses. 相似文献
86.
87.
Long-Term Clinical Outcomes Following Treatment of Actinic Keratosis with Imiquimod 5% Cream 总被引:2,自引:0,他引:2
Lee Peter K. MD PhD Harwell William B. MD † Loven Keith H. MD ‡ Phillips Tania J. MD § Whiting David A. MD res Kara L. MS # Lee James H. MD PhD # 《Dermatologic surgery》2005,31(6):659-664
BACKGROUND: The results from four phase III, randomized, vehicle-controlled studies showed that imiquimod 5% cream (imiquimod) was safe and effective in the treatment of actinic keratosis (AK). Patients applied imiquimod or vehicle cream to AK lesions on the face or balding scalp, dosing three times per week or two times per week for 16 weeks. OBJECTIVE: To obtain long-term safety follow-up data and estimate AK recurrence in patients who completely cleared their AK lesions in the treatment area at the 8-week post-treatment visit in the phase III studies. METHODS: One hundred forty-six patients from 30 study centers in the United States were evaluated for clinical evidence of AK, and safety data were collected. RESULTS: After a median follow-up period of 16 months, 24.7% (19 of 77) of the patients administered imiquimod three times per week and 42.6% (23 of 54) of the patients administered imiquimod two times per week had a recurrence of AK (the appearance of at least one AK lesion) in the original treatment area. The median number of AK lesions present was one lesion for both patients receiving imiquimod three times and those receiving imiquimod two times per week compared with a median of six lesions at baseline in the combined three times per week and two times per week phase III studies. There were no long-term safety issues, and the skin quality seen in the imiquimod-treated patients at the end of the phase III studies was maintained. CONCLUSION: One and a half years following treatment, imiquimod continued to provide a long-term clinical benefit in a majority of patients who experienced complete clearance of their AK lesions. 相似文献
88.
John F. Fraser MBChB ; Leila Cuttle BSc ; Margit Kempf BmedLSci ; Gael E. Phillips MBBS ; Peter K. O'Rourke PhD ; Kelvin Choo MBBS ; Mark T. Hayes PhD ; Roy M. Kimble MBChB 《Wound repair and regeneration》2005,13(2):189-197
Early to mid-term fetuses heal cutaneous incisional wounds without scars; however, fetal response to burn injury has not been ascertained. We present a fetal model of thermal injury and subsequent analysis of fetal and lamb response to burn injury. A reproducible deep dermal burn injury was created in the fetus by application of water at 66 degrees C for 7 seconds, and at 82 degrees C for 10 seconds to the lamb. Macroscopically, the area of fetal scald was undetectable from day 7 post injury, while all lamb scalds were readily identified and eventually healed with scarring. Using a five-point histopathology scoring system for alteration in tissue morphology, differences were detected between control and scalded skin at all stages in lamb postburn, but no difference was detected in the fetal model after day 7. There were also large differences in content of alpha-smooth muscle actin and transforming growth factor-beta1 between control and scalded lamb and these differences were statistically significant at day 14 (P < 0.01). This novel model of fetal and lamb response to deep dermal injury indicates that the fetus heals a deep burn injury in a scarless fashion. Further elucidation of this specific fetal process of burn injury repair may lead to improved outcome for patients with burn injury. 相似文献
89.
Anthony J Phillips 《Clinical & experimental optometry》2003,86(6):399-402
Evidence increasingly supports keratoconus as an inherited, genetic disorder. If this is the case, it would be expected to express itself as a binocular condition even though variable expression of the gene may show differing levels in the two eyes. It is a common occurrence in specialist contact lens practices to see pseudo‐monocular keratoconus, that is, an overt clinical level of the condition in one eye and forme fruste keratoconus in the other. The advent of videokeratoscopy has shown almost every case of apparent monocular keratoconus to be different expressions of the condition in the two eyes. Nevertheless, rare cases of the condition are seen that appear to be truly monocular. Such a case is presented in which the condition has been present for more than 23 years. The age of the subject makes the future onset of keratoconus highly unlikely and videokeratoscopy does not show the presence of forme fruste in the ‘good’ eye. There is no history of monocular eye rubbing. Pachymetry shows the normal eye to be well within the range of normal corneal thickness, while the keratoconus in the other eye is sufficiently advanced to warrant corneal grafting. Thus, it is a case of true monocular keratoconus and represents an extreme example of variable gene expression. 相似文献
90.
D. Trainer P.R. Pehrsson D.B. Haytowitz J.M. Holden K.M. Phillips A.S. Rasor N.A. Conley 《Journal of food composition and analysis》2010,23(8):843-851
The National Food and Nutrient Analysis Program (NFNAP) was implemented in 1997 to update and improve the quality of food composition data maintained by the United States Department of Agriculture (USDA). NFNAP was designed to sample and analyze frequently consumed foods in the U.S. food supply using statistically rigorous sampling plans, established sample handling procedures, and qualified analytical laboratories. Methods for careful handling of food samples from acquisition to analysis were developed to ensure the integrity of the samples and subsequent generation of accurate nutrient values. The infrastructure of NFNAP, under which over 1500 foods have been sampled, mandates tested sample handling protocols for a wide variety of foods. The majority of these foods were categorized into several major areas: (1) frozen foods; (2) fresh produce and/or highly perishable foods requiring refrigeration; (3) fast foods and prepared foods; (4) shelf-stable foods; (5) specialized study and non-retail (point of production) foods; and (6) foods from remote areas (e.g. American Indian reservations). This paper describes the sample handling approaches, from the collection and receipt of the food items to the preparation of the analytical samples, with emphasis on the strategies developed for those foods. It provides a foundation for developing sample handling protocols of foods to be analyzed under NFNAP and for other researchers working on similar projects. 相似文献