全文获取类型
收费全文 | 179篇 |
免费 | 6篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 17篇 |
妇产科学 | 11篇 |
基础医学 | 23篇 |
口腔科学 | 12篇 |
临床医学 | 10篇 |
内科学 | 61篇 |
神经病学 | 8篇 |
特种医学 | 1篇 |
外科学 | 21篇 |
综合类 | 4篇 |
预防医学 | 2篇 |
眼科学 | 3篇 |
药学 | 3篇 |
中国医学 | 1篇 |
肿瘤学 | 3篇 |
出版年
2024年 | 1篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 5篇 |
2012年 | 17篇 |
2011年 | 10篇 |
2010年 | 8篇 |
2009年 | 6篇 |
2008年 | 16篇 |
2007年 | 18篇 |
2006年 | 13篇 |
2005年 | 7篇 |
2004年 | 10篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1989年 | 2篇 |
排序方式: 共有185条查询结果,搜索用时 15 毫秒
1.
Baki Hazer Alipaa Ayas Necati Beirli Necdet Saltek Bahattin M. Baysal 《Macromolecular chemistry and physics.》1989,190(8):1987-1996
Some new macroinitiators ( 5 ) containing azo and peroxy groups were synthesized by transformation of esters of poly(ethylene glycol) ( 1 ) (PEG) of different molecular weight with hydroxyl end groups and an azo group in the middle into the corresponding polymers with tert-butylperoxycarbonyl end groups by reaction with terephthaloyl chloride and subsequently with tert-butyl hydroporoxide. Decomposition in the presence of styrene at 60°C or with 3,6,9-triazaun-decane-1,11-diamine in presence of methyl methacrylate gave the corresponding ABA block copolymer 6 and the ABBA block copolymer 7 , respectively. Both block copolymers were used as polymeric initiators. The ABCBA block copolymer 8 was synthesized from 6 and methyl methacrylate or from 7 and styrene by thermally induced polymerization at 80°C. The resulting block copolymers were separated from the homopolymers by selective solvent extraction and characterized by spectroscopic and fractional precipitation methods. 相似文献
2.
Ayas M Solh H Mustafa MM Al-Mahr M Al-Fawaz I Al-Jefri A Shalaby L Al-Nasser A Al-Sedairy R 《Bone marrow transplantation》2001,27(2):139-143
Nineteen patients with Fanconi anemia (FA) and bone marrow failure underwent bone marrow transplantation (BMT) from matched siblings. Median age at BMT was 8.7 years. Conditioning consisted of low-dose cyclophosphamide (CY 5 mg/kg x 4 days) and thoracoabdominal irradiation (TAI 400 cGy). Graft-versus-host disease (GVHD) prophylaxis was cyclosporin A (CsA) in 13 patients and CsA plus methotrexate in 6 patients. Antithymocyte globulin (ATG) was added in the pretransplant as well as the post-transplant period. All patients received high-dose acyclovir from day 2 pre-BMT to day 28 post BMT, and intravenous immunoglobulins (IVIG), 500 mg/kg weekly from day 7 pre-BMT to day 90 post BMT. No fungal prophylaxis was given. All patients engrafted, (median, 14 days for an absolute neutrophil count > or =0.5 x 10(9)/l; median, 37 days for platelet count > or =20 x 10(9)/l). Fourteen (74%) patients are alive with sustained engraftment and are transfusion independent. Three (16.6%) patients developed acute GVHD; none developed chronic GVHD. Five (26%) patients developed invasive fungal infections, and two (10%) developed fatal CMV disease. We believe the addition of ATG may have contributed to the increased incidence of severe life-threatening fungal and viral infections in our series. 相似文献
3.
Purpose
Obstructive sleep apnea (OSA) is a common disease which is associated with elevated inflammatory markers and adhesion molecules, possibly due to nightly intermittent hypoxia (IH). The purpose of this study was to test the hypothesis that IH would increase systemic inflammatory markers in healthy human males.Methods
Healthy, young male subjects (n?=?9; 24?±?2?years) were exposed to a single daily isocapnic hypoxia exposure (oxyhemoglobin saturation?=?80%, 1?h/day) for 10 consecutive days. Serum granulocyte macrophage colony-stimulating factor, interferon-??, interleukin-1??, interleukin-6, interleukin-8, leptin, monocyte chemotactic protein-1, vascular endothelial growth factor, intracellular adhesion molecule-1, and vascular cell adhesion molecule-1 were measured before and following the 10?days of IH using Luminex.Results
Nine subjects completed the study (24?±?2?years; 24?±?2?kg/m2). The mean oxyhemoglobin saturation was 80.8?±?1.6% during the hypoxia exposures. There was no significant change in any of the markers of inflammation (paired t test, P?>?0.2 all cytokines).Conclusions
These findings suggest that (1) a more substantial or a different pattern of hypoxemia might be necessary to activate systemic inflammation, (2) the system may need to be primed before hypoxic exposure, or (3) increases in inflammatory markers in patients with OSA may be more related to other factors such as obesity or nocturnal arousal. 相似文献4.
Keles GC Cetinkaya BO Ayas B Isildak I Diraman E Koprulu H Acikgoz G 《Clinical oral investigations》2007,11(4):369-376
The hypothesis, a relationship between gingival tissue platelet activating factor (PAF) levels and healing after periodontal
surgery, was tested by measuring PAF levels in gingival tissues collected from sites that had undergone flap surgery and guided
tissue regeneration (GTR) or flap surgery alone. Using a split-mouth design, 20 intrabony defects were randomly assigned to
treatment with flap surgery and GTR (group 1) or with flap surgery alone (group 2). Gingival tissue samples were obtained
at surgery (baseline) and at 6-month follow-up evaluation visit. One half of each sample was used for analysis of PAF levels
by high-performance liquid chromatography, and the other half of the sample was used for histomorphometric analysis that included
measurements of number and diameter of blood vessels. PAF levels and diameter of blood vessels were significantly decreased
(p < 0.01), and the number of blood vessels was significantly increased (p < 0.05) in both groups after 6 months compared to the baseline values. Postoperative number of blood vessels were significantly
higher in group 1 (p < 0.05), whereas there was no significant difference in postoperative PAF levels between the two groups (p > 0.05). Based on the reported results, it is suggested that a decrease in gingival PAF levels might be found after conventional
and regenerative periodontal surgery. 相似文献
5.
Cetinkaya BO Keles GC Ayas B Aydin O Kirtiloglu T Acikgoz G 《Clinical oral investigations》2007,11(1):61-68
Guided tissue regeneration is based on preventing the more rapidly proliferating epithelium from growing into the periodontal
defect after surgical procedures incorporating barrier membranes. The aim of this study was to compare the proliferative activity
of gingival epithelium using proliferating cell nuclear antigen (PCNA) as a marker of cell proliferation after surgical treatments
with bioactive glass graft material and bioabsorbable membrane. Using split mouth design, 20 intrabony defects were randomly
assigned treatments with bioactive glass (BG group) or bioabsorbable membrane (BM group). Gingival biopsies were taken at
preoperative and postoperative 12 weeks. After histological processing, the number of the inflammatory cells was measured
in hematoxylin and eosin-stained sections; PCNA expression was determined in immunohistochemically-stained sections. At postoperative
12 weeks, the number of the inflammatory cells was significantly decreased (p < 0.01), PCNA expression was significantly increased (p < 0.001) in both treatment groups compared to baseline data. There was no significant difference in PCNA expression between
baseline values of two groups (p > 0.05), while at postoperative 12 weeks, increase in BG group was significantly greater than that in BM group (p < 0.001). These results suggest that epithelial cell proliferation is more prominent after treatment of intrabony defects
with bioactive glass compared to the treatment with bioabsorbable membrane. 相似文献
6.
Ayas M Al-Jefri A Al-Mahr M Rifai S Al-Seraihi A Tbakhi A Mustafa M Khairy A Moussa E Iqbal A Shalaby L El-Solh H 《Bone marrow transplantation》2005,35(5):463-466
In all, 22 patients with confirmed Fanconi anemia (FA) underwent stem cell transplantation (SCT) from HLA-matched, related donors at KFSHRC. Median age at SCT was 7.6 years (range, 2.5-14.6 years). Conditioning regimen consisted of cyclophosphamide (CY) 15 mg/kg/day intravenously (i.v.) for 4 consecutive days, in addition to equine antithymocyte globulins (ATG) given i.v. at 40 mg/kg/day for four doses pre-SCT. No radiation therapy was given. For graft-versus-host disease prophylaxis, we used cyclosporin at the standard doses; ATG was added at 20 mg/kg/dose i.v. on days 2, 4, 6, 8, 10, and 12 post-SCT (total of six doses). All patients engrafted and are alive and transfusion independent with a median follow-up time of 20.2 months (range, 3.3-59 months). One patient however developed a decrease in her WBC and platelet count. Her work-up revealed slightly hypocellular bone marrow, and a series of chimerism studies over 1 year confirmed that she has stable mixed chimerism; she remains transfusion independent. We conclude that low-dose CY without radiation therapy can be used satisfactorily in the conditioning of patients with FA undergoing related SCT. 相似文献
7.
Ayas S Aköz I Eskicirak E Karateke A Bozoklu O 《European journal of gynaecological oncology》2007,28(2):155-159
BACKGROUND: Pregnancy complicated by endodermal sinus tumor (EST) of the ovary has rarely been reported. CASE: A huge ovarian EST causing bowel obstruction was found in a 22-year-old patient at 34 weeks of gestation. Abnormally high alpha-fetoprotein (AFP) levels suggested a malignant germ cell tumor of the ovary. The patient was submitted to cesarean section and fertility sparing surgery, and then received four courses of combination chemotherapy. There was no evidence of recurrence 19 months after initial treatment but transvaginal ultrasound (US) evaluation showed an intrauterine pregnancy of six weeks. We delivered a 3,200 g healthy male baby with Apgar scores of 8 and 9 by elective cesarean section at 39 weeks of gestation. CONCLUSIONS: Successful outcome of a second pregnancy is possible after treatment with fertility sparing surgery and combination chemotherapy for an endodermal sinus tumor associated with a first pregnancy. Moreover checking of weekly AFP levels and performing monthly abdominal US could be effective for surveillance of these pregnancies. However management of EST during pregnancy should be based on consideration of the patient's presenting condition, preferences, and gestational age. 相似文献
8.
Ayas S Aköz I Karateke A Bozoklu O 《Clinical and experimental obstetrics & gynecology》2007,34(3):195-196
OBJECTIVE: Cesarean scar pregnancy is implantation of the pregnancy within the fibrous tissue of the cesarean scar which is completely surrounded by myometrium. METHOD AND RESULT: A 32-year-old woman, gravida 2, para 1 presented at our emergency department with mild lower abdominal pain and minimal vaginal bleeding. She was diagnosed with cesarean scar pregnancy. Conservative treatment with methotrexate 50 mg/m2 was administered IM on days 0 and 8. Her betaHCG value was zero at the 14th week after beginning of the treatment. CONCLUSION: Repeated methotrexate administration in the management of cesarean scar pregnancy should be attempted in informed patients who especially desire fertility and can be closely followed up. 相似文献
9.
10.
Muna Qayed Tao Wang Michael T. Hemmer Stephen Spellman Mukta Arora Daniel Couriel Amin Alousi Joseph Pidala Hisham Abdel-Azim Mahmoud Aljurf Mouhab Ayas Menachem Bitan Mitchell Cairo Sung Won Choi Christopher Dandoy David Delgado Robert Peter Gale Gregory Hale John Horan 《Biology of blood and marrow transplantation》2018,24(3):521-528
Relapse remains the major cause of mortality after hematopoietic cell transplantation (HCT) for pediatric acute leukemia. Previous research has suggested that reducing the intensity of calcineurin inhibitor-based graft-versus-host disease (GVHD) prophylaxis may be an effective strategy for abrogating the risk of relapse in pediatric patients undergoing matched sibling donor (MSD) HCT. We reasoned that the benefits of this strategy could be maximized by selectively applying it to those patients least likely to develop GVHD. We conducted a study of risk factors for GVHD, to risk-stratify patients based on age. Patients age <18 years with leukemia who received myeloablative, T cell-replete MSD bone marrow transplantation and calcineurin inhibitor-based GVHD prophylaxis between 2000 and 2013 and were entered into the Center for International Blood and Marrow Transplant Research registry were included. The cumulative incidence of grade II-IV acute GVHD (aGVHD) was 19%, that of grade II-IV aGVHD 7%, and that of chronic GVHD (cGVHD) was 16%. Compared with age 13 to 18 years, age 2 to 12 years was associated with a lower risk of grade II-IV aGVHD (hazard ratio [HR], .42; 95% confidence interval [CI], .26 to .70; P?=?.0008), grade II-IV aGVHD (HR, .24; 95% CI, .10 to .56; P?=?.001), and cGVHD (HR, .32; 95% CI, .19 to .54; P?<?.001). Compared with 2000-2004, the risk of grade II-IV aGVHD was lower in children undergoing transplantation in 2005-2008 (HR, .36; 95% CI, .20 to .65; P?=?.0007) and in 2009-2013 (HR, .24; 95% CI. .11 to .53; P?=?.0004). Similarly, the risk of grade III-IV aGVHD was lower in children undergoing transplantation in 2005-2008 (HR, .23; 95% CI, .08 to .65; P?=?.0056) and 2009-2013 (HR, .16; 95% CI, .04 to .67; P?=?.0126) compared with those doing so in 2000-2004. We conclude that aGVHD rates have decreased significantly over time, and that children age 2 to 12 years are at very low risk for aGVHD and cGVHD. These results should be validated in an independent analysis, because these patients with high-risk malignancies may be good candidates for trials of reduced GVHD prophylaxis. 相似文献