全文获取类型
收费全文 | 5894篇 |
免费 | 535篇 |
国内免费 | 74篇 |
专业分类
耳鼻咽喉 | 68篇 |
儿科学 | 164篇 |
妇产科学 | 99篇 |
基础医学 | 790篇 |
口腔科学 | 93篇 |
临床医学 | 779篇 |
内科学 | 1183篇 |
皮肤病学 | 28篇 |
神经病学 | 656篇 |
特种医学 | 206篇 |
外科学 | 979篇 |
综合类 | 47篇 |
一般理论 | 3篇 |
预防医学 | 388篇 |
眼科学 | 178篇 |
药学 | 543篇 |
1篇 | |
中国医学 | 3篇 |
肿瘤学 | 295篇 |
出版年
2021年 | 105篇 |
2020年 | 52篇 |
2019年 | 90篇 |
2018年 | 83篇 |
2017年 | 83篇 |
2016年 | 76篇 |
2015年 | 69篇 |
2014年 | 126篇 |
2013年 | 176篇 |
2012年 | 252篇 |
2011年 | 258篇 |
2010年 | 133篇 |
2009年 | 159篇 |
2008年 | 224篇 |
2007年 | 254篇 |
2006年 | 251篇 |
2005年 | 251篇 |
2004年 | 190篇 |
2003年 | 184篇 |
2002年 | 167篇 |
2001年 | 163篇 |
2000年 | 191篇 |
1999年 | 138篇 |
1998年 | 70篇 |
1997年 | 61篇 |
1996年 | 66篇 |
1995年 | 56篇 |
1993年 | 55篇 |
1992年 | 165篇 |
1991年 | 140篇 |
1990年 | 166篇 |
1989年 | 150篇 |
1988年 | 143篇 |
1987年 | 144篇 |
1986年 | 132篇 |
1985年 | 126篇 |
1984年 | 104篇 |
1983年 | 88篇 |
1982年 | 59篇 |
1981年 | 56篇 |
1980年 | 56篇 |
1979年 | 87篇 |
1978年 | 86篇 |
1977年 | 85篇 |
1976年 | 63篇 |
1975年 | 54篇 |
1974年 | 83篇 |
1973年 | 80篇 |
1971年 | 48篇 |
1970年 | 56篇 |
排序方式: 共有6503条查询结果,搜索用时 31 毫秒
101.
The modern endoscopic approach to ureterocele 总被引:10,自引:0,他引:10
Hagg MJ Mourachov PV Snyder HM Canning DA Kennedy WA Zderic SA Duckett JW 《The Journal of urology》2000,163(3):940-943
PURPOSE: During the last 20 years the surgical approach to ureterocele has evolved from major open surgery to minimally invasive endoscopic puncture. We believe that the endoscopic approach decreases the need for open surgical procedures. We identified specific factors that predict the need for repeat surgery. MATERIALS AND METHODS: We reviewed the charts of 60 new patients with ureterocele treated with primary endoscopic incision between 1991 and 1995. Followup ranged from 4 to 62 months (mean 20). Mode of presentation, ureterocele location, associated vesicoureteral reflux and association of the ureterocele with a duplex system were evaluated. Ureterocele wall thickness was assessed subjectively via radiographic and cystoscopic methods, and categorized as thin, intermediate and thick. RESULTS: All 9 patients with a single system ureterocele had an intravesical ureterocele. No patient had associated reflux nor did any require a secondary open procedure. In 3 cases new onset ipsilateral reflux into the ureterocele spontaneously resolved. Of the 51 patients with a duplex system and associated ureterocele 19 (37%) required a secondary open procedure. The ureterocele was intravesical and ectopic in 22 (43%) and 29 (57%) cases, respectively. Reflux was associated with the ureterocele in 27 patients (53%), and 12 (44%) required a secondary open procedure. A total of 11 patients underwent ureteral reimplantation of 15 refluxing renal units and only 2 renal units required ureteral tapering. Reflux is no longer present in 14 of the 15 renal units (93%). Patients with a thick walled ureterocele required repeat puncture more frequently than those with a nonthick ureterocele. CONCLUSIONS: With the use of modern endoscopic techniques children with intravesical and single system ureteroceles require secondary open surgery less frequently than those with ectopic and duplex system ureteroceles. The mode of presentation does not predict the need for a repeat open procedure. Thick walled ureteroceles require repeat endoscopic puncture more frequently than thin and intermediate walled ureteroceles. 相似文献
102.
Quayhagen MP Quayhagen M Corbeil RR Hendrix RC Jackson JE Snyder L Bower D 《International psychogeriatrics / IPA》2000,12(2):249-265
To evaluate nonpharmacologic interventions, caregivers (65 women, 38 men) and their dementia-diagnosed spouses (patients) were randomized to one of four treatment programs (cognitive stimulation, dyadic counseling, dual supportive seminar, and early-stage day care) or to a wait-list control group. Assessments occurred initially and at postintervention (3 months). Patients were evaluated on memory, verbal fluency, and problem-solving ability, and caregivers were assessed on marital interaction, emotional status, and physical health, along with stress, coping, and social support. Caregivers also completed a program evaluation. Repeated measures procedures showed that patients in the cognitive stimulation group demonstrated more improvement over time in cognitive outcomes, and caregivers decreased in depressive symptoms. Early-stage day-care and dual supportive seminar group caregivers reported a decrease in hostility and a decrease in use of negative coping strategies, respectively. Although qualitatively derived benefits differed across groups, similarities in program content reduced the potential for quantitative differentiation among the groups. 相似文献
103.
104.
Annals of Surgical Oncology - 相似文献
105.
Illicit substance use, especially of inhalants, is a public health crisis during adolescence, particularly for maltreated youths. This study advances the literature by highlighting the prevalence of inhalant use among child welfare–involved adolescents. Using the National Survey of Child and Adolescent Well-Being (NSCAW) II data set, case-status factors, problem behaviors, deviant peers, delinquency, depression, and school peer engagement were inspected using logistic regression. Females, delinquency, deviant peers, problematic behaviors, and depression are positively related to inhalant use, whereas youth school peer engagement mitigates inhalant use. Attention to peer relationships and psychosocial risk factors is necessary for adolescents. 相似文献
106.
The anterosuperior rotator interval portal for SLAP repair anchor placement is the perfect balance between obtaining the proper anchor trajectory and respecting the rotator cuff integrity. 相似文献
107.
Oral sensations (i.e., taste, oral somatosensation, retronasal olfaction) are integrated into a composite sense of flavor, which guides dietary choices with long-term health impact. The nerves carrying this input are vulnerable to peripheral damage from multiple sources (e.g., otitis media, tonsillectomy, head injury), and this regional damage can boost sensations elsewhere in the mouth because of central interactions among nerve targets. Mutual inhibition governs this compensatory process, but individual differences lead to variation in whole-mouth outcomes: some individuals are unaffected, others experience severe loss, and some encounter sensory increases that may (if experienced early in life) elevate sweet-fat palatability and body mass. Phantom taste, touch, or pain sensations (e.g., burning mouth syndrome) may also occur, particularly in those expressing the most taste buds. To identify and treat these conditions effectively, emerging clinical tests measure regional vs. whole-mouth sensation, stimulated vs. phantom cues, and oral anatomy. Scaling methods allowing valid group comparisons have strongly aided these efforts. Overall, advances in measuring oral sensory function in health and disease show promise for understanding the varied clinical consequences of nerve damage. 相似文献
108.
109.
Jessica M Snyder Denise M Molk Piper M Treuting 《Journal of the American Association for Laboratory Animal Science》2013,52(3):301-307
Over a 1-mo period, increased morbidity and mortality occurred in a flock of zebra finches (Taeniopygia guttata). Complete postmortem examination was performed on 6 of the affected birds, 4 of which subsequently were diagnosed with the avian gastric yeast previously known as megabacteriosis (Macrorhabdus ornithogaster). The remaining 2 birds were diagnosed with a cloacal abscess and with large bowel perforation and peritonitis. All the birds had been prophylactically treated with amphotericin B for megabacteria 2 mo previously. An environmental assessment revealed that the light cycle had been altered, and the birds were being exposed to constant light. With correction of the light cycle, the health of the birds improved dramatically. The remaining birds were treated again with amphotericin B, and baseline mortality returned to normal. The birds in this report show several similarities to previous reports of sleep deprivation syndrome in mammals.Over a 1-mo period (from late April to late May 2011), a marked increase in morbidity and mortality was noted in a flock of zebra finches (Taeniopygia guttata) at our facility (University of Washington). These birds were involved in a project studying the neural mechanisms of vocal learning. The finches were obtained from Magnolia Bird Farm (Anaheim, CA). In March 2011, a shipment of 50 male birds arrived and was moved into a new space with 2 rooms. One room housed breeding birds in cages containing breeding pairs and offspring; the other room, into which these new arrivals were placed, housed adult male birds in cages of 4 to 9 birds.Birds in the room containing the adult nonbreeders were affected exclusively. Clinical signs consisted of puffed and ruffled feathers, lethargy, increased respiratory effort, and feather loss. These signs were noted in birds that had not undergone experimental manipulation. Several of the birds that died or were euthanized after becoming sick and lethargic were necropsied. Findings on postmortem examination for the majority of cases included emaciated body condition, necrotizing enteritis and colitis and, in individual cases, included bowel perforation and peritonitis and severe pyogranulomatous abscessation. Megabacteriosis (avian gastric yeast; Macrorhabdus ornithogaster) was diagnosed histologically in 4 of the 6 birds evaluated. A light meter was placed in the housing room; results showed that the dark period of the light cycle was absent. The light cycle was corrected, and morbidity and mortality decreased dramatically. 相似文献
110.