全文获取类型
收费全文 | 19868篇 |
免费 | 1236篇 |
国内免费 | 88篇 |
专业分类
耳鼻咽喉 | 195篇 |
儿科学 | 633篇 |
妇产科学 | 465篇 |
基础医学 | 2616篇 |
口腔科学 | 404篇 |
临床医学 | 2270篇 |
内科学 | 4756篇 |
皮肤病学 | 541篇 |
神经病学 | 1972篇 |
特种医学 | 426篇 |
外科学 | 1572篇 |
综合类 | 111篇 |
一般理论 | 8篇 |
预防医学 | 2014篇 |
眼科学 | 321篇 |
药学 | 1337篇 |
中国医学 | 81篇 |
肿瘤学 | 1470篇 |
出版年
2023年 | 168篇 |
2022年 | 237篇 |
2021年 | 571篇 |
2020年 | 357篇 |
2019年 | 558篇 |
2018年 | 687篇 |
2017年 | 442篇 |
2016年 | 516篇 |
2015年 | 582篇 |
2014年 | 804篇 |
2013年 | 1047篇 |
2012年 | 1668篇 |
2011年 | 1666篇 |
2010年 | 867篇 |
2009年 | 821篇 |
2008年 | 1380篇 |
2007年 | 1363篇 |
2006年 | 1327篇 |
2005年 | 1287篇 |
2004年 | 1124篇 |
2003年 | 1068篇 |
2002年 | 984篇 |
2001年 | 96篇 |
2000年 | 87篇 |
1999年 | 135篇 |
1998年 | 160篇 |
1997年 | 148篇 |
1996年 | 138篇 |
1995年 | 107篇 |
1994年 | 79篇 |
1993年 | 93篇 |
1992年 | 63篇 |
1991年 | 41篇 |
1990年 | 39篇 |
1989年 | 43篇 |
1988年 | 27篇 |
1987年 | 24篇 |
1986年 | 35篇 |
1985年 | 40篇 |
1984年 | 32篇 |
1983年 | 33篇 |
1982年 | 38篇 |
1981年 | 37篇 |
1980年 | 39篇 |
1979年 | 17篇 |
1978年 | 17篇 |
1977年 | 10篇 |
1976年 | 12篇 |
1974年 | 13篇 |
1973年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
991.
992.
993.
The studies of parasite fauna have in Poland a long tradition. Generally the helmint fauna of all groups of vertebrates was more or less examined and as much as over 100 species of Monogenea, almost 400 Digenea, over 250 Cestoda, about 500 Nematoda and 32 Acanthocephala have been recorded. The best recognized are the helminths of fish (especially those of Cyprinidae, Esocidae, Percidae and Salmonidae), frogs examined in various regions of Poland, some birds (especially connected with water environment: Anseriformes, Ciconiformes, Podicipediformes), most of insectivores (although examined only in few localities), European bisons, deers, foxes and wild boars (all under permanent monitoring), as well as domestic animals (cattle, horses, sheeps) and pets. Such groups like some amphibians, reptiles, bats, carniwores, some birds (especially Passeriformes, Charadriiformes, falcons and eagles) need further exploration, as some host species were not the subject of parasitological investigation. In some cases it will be rather difficult goal, as most of these animals are under strict preservation, and only dead (naturally or accidentally) specimens can be autopsied. 相似文献
994.
Durán MT Del Pozo J Yebra MT Crespo MG Paniagua MJ Cabezón MA Guarro J 《Acta dermato-venereologica》2003,83(3):218-221
A cutaneous mycoses caused by Ulocladium chartarum in a heart transplant recipient is reported. The infection cleared after complete surgical excision and 6 months of oral itraconazole therapy. In vitro activity of amphotericin B, fluconazole, itraconazole, voriconazole, ravuconazole and terbinafine against the clinical isolate is shown. 相似文献
995.
Tinea barbae is a rare dermatophytosis that affects the hair and hair follicles of the beard and mustache. This paper presents 9 cases of tinea barbae observed over an 18-year period of time and classified as follows: 1 was superficial and 8 were deep (6 folliculitis-like and 2 kerion-like). Most of the cases (4) were associated with topical steroid therapy, others with pet contact (3 cases) and one with diabetes. The causal agents isolated were: Trichophyton rubrum in 3; Microsporum canis in 3; Trichophyton mentagrophytes in 2; and Trichophyton tonsurans in one. The involvement of the hair was observed and classified in all cases. The trichophytin skin reaction was positive in all 9 patients. All the patients were treated with systemic antimycotics, 3 cases with griseofulvin, 1 with ketoconazole, 3 with itraconazole, and 2 with terbinafine. Clinical and mycologic cures were achieved at 6 to 8 weeks of treatment at the usual doses. 相似文献
996.
Oliveira G Matoso E Vicente A Ribeiro P Marques C Ataíde A Miguel T Saraiva J Carreira I 《Journal of autism and developmental disorders》2003,33(2):177-185
In this report we describe the case of an 11-year-old male with autism and mental retardation, presenting a tetrasomy of chromosome 3q. Cytogenetic analysis showed a mosaic for an unbalanced karyotype consisting of mos46,XY,add(12)(p13.3)(56)/46,XY(45). FISH using WCP and subtelomeric probes identified the extra material on 12p to be an inverted duplication of the distal segment of chromosome 3q. Anomalies in chromosome 3q have not been previously described in association with autism, although association with psychomotor delays and behavior problems has been frequently reported and are here further discussed. This chromosomal 3q segment is therefore likely to include genes involved in specific neurodevelopment pathways, and further analysis of the region is warranted for the identification of the molecular alterations that lead to the autistic features described. 相似文献
997.
998.
Utter GH Owings JT Jacoby RC Gosselin RC Paglieroni TG 《The Journal of trauma》2002,52(6):1071-7; discussion 1077
BACKGROUND: Activated monocytes are able to express tissue factor (TF), a potent procoagulant. The effect of injury on monocyte TF expression is not known. We have found that patients with head injury (HI) have increased antithrombin activity and decreased platelet function compared with non-head-injured trauma patients. Our objective was to determine whether injury increases TF expression by monocytes and whether this increased TF expression is attenuated in patients with HI. METHODS: We prospectively enrolled 37 trauma patients (meeting the entry criterion of an Injury Severity Score [ISS] > or = 9) and 11 healthy control subjects. We sampled blood on arrival and then at 24, 48, and 72 hours. We performed flow cytometry with antibody markers for monocytes (CD14), platelets (CD42a), and TF. We compared results of patients with HI (Glasgow Coma Scale score < or = 9 and Abbreviated Injury Scale Head/Neck score > or = 3) with patients without HI and with controls. RESULTS: Patients had a mean ISS of 23.9 +/- 2.3 (+/- SEM), mean age of 45 +/- 3 years, and mean length of stay of 17.9 +/- 3.2 days. Seventy-six percent were men, and 97% had blunt trauma. The overall mortality rate was 11%. Trauma patients had greater monocyte TF expression than controls for all time periods (p < 0.05). Trauma patients with HI had elevated monocyte TF expression compared with controls for the initial and 24-hour time periods, but they subsequently had more rapid return of monocyte TF expression to baseline (despite a higher ISS) than trauma patients without HI. Trauma patients both with and without HI had increased platelet-monocyte binding at each time versus controls. CONCLUSION: Trauma induces TF expression on monocytes. Patients with HI have attenuation of this expression by 24 hours after injury. The attenuation of TF expression by monocytes in HI parallels the increase in AT and the decrease in platelet function seen after HI. The correlation of TF expression with platelet-monocyte binding suggests that platelet binding may lead to monocyte activation. 相似文献
999.
Selective estrogen receptor modulators inhibit the effects of insulin-like growth factors in hyperparathyroidism 总被引:3,自引:0,他引:3
BACKGROUND: Primary hyperparathyroidism (HPT) predominantly affects perimenopausal women, leading to speculations that an estrogen imbalance may be liable. We have previously demonstrated the importance of the insulin-like growth factor (IGF) axis in HPT. Because the antiestrogen tamoxifen has been shown to modulate the IGF axis, we examined the interactions of selective estrogen receptor modulators (SERMs) and IGF in HPT. METHODS; Estrogen receptors were evaluated by Western immunoligand blotting. Sixteen parathyroid glands from 19 patients were included. After adhesion, the cells were treated with IGF (I or II) +/- estrogen +/- SERMs (tamoxifen, ICI 182,780) for 96 hours in serum-free media. Proliferation was assessed by measuring tritiated thymidine incorporation. RESULTS: Both primary and secondary HPT express estrogen receptors alpha and beta. Primary and secondary HPT had comparable responses to SERMs, they were analyzed together. Compared with control (100%), IGFs (I and II) induced a significant increase in DNA synthesis. Estradiol at 10(-8) and 10(-7) mol/L (physiologic range) had no significant effects on IGF (I and II, P >.05). Both tamoxifen and ICI 182,780 inhibited basal DNA synthesis (P <.05) and abolished the effects of both IGF I and II (P <.05). CONCLUSIONS: SERMs are capable of reducing basal and IGF-stimulated DNA synthesis. This reduction in proliferation has implications for cancer biology and therapeutic potential for SERMs in HPT. 相似文献
1000.
Postoperative cognitive dysfunction in middle-aged patients 总被引:19,自引:0,他引:19
Johnson T Monk T Rasmussen LS Abildstrom H Houx P Korttila K Kuipers HM Hanning CD Siersma VD Kristensen D Canet J Ibañaz MT Moller JT;ISPOCD Investigators 《Anesthesiology》2002,96(6):1351-1357
BACKGROUND: Postoperative cognitive dysfunction (POCD) after noncardiac surgery is strongly associated with increasing age in elderly patients; middle-aged patients (aged 40-60 yr) may be expected to have a lower incidence, although subjective complaints are frequent. METHODS: The authors compared the changes in neuropsychological test results at 1 week and 3 months in patients aged 40-60 yr, using a battery of neuropsychological tests, with those of age-matched control subjects using Z-score analysis. They assessed risk factors and associations of POCD with measures of subjective cognitive function, depression, and activities of daily living. RESULTS: At 7 days, cognitive dysfunction as defined was present in 19.2% (confidence interval [CI], 15.7-23.1) of the patients and in 4.0% (CI, 1.6-8.0) of control subjects (P < 0.001). After 3 months, the incidence was 6.2% (CI, 4.1-8.9) in patients and 4.1% (CI, 1.7-8.4) in control subjects (not significant). POCD at 7 days was associated with supplementary epidural analgesia and reported avoidance of alcohol consumption. At 3 months, 29% of patients had subjective symptoms of POCD, and this finding was associated with depression. Early POCD was associated with reports of lower activity scores at 3 months. CONCLUSIONS: Postoperative cognitive dysfunction occurs frequently but resolves by 3 months after surgery. It may be associated with decreased activity during this period. Subjective report overestimates the incidence of POCD. Patients may be helped by recognition that the problem is genuine and reassured that it is likely to be transient. 相似文献