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Exfoliation and dispersion of graphene in ethanol-water mixtures

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Frontiers of Materials Science 2012年第2期6卷 176-182页

作者： Wei-Wei LIU Bao-Yu xia xiao-xia wang Jian-Nong wang Shanghai Key Laboratory for Laser Processing and Materials Modification School of Materials Science and EngineeringShanghai Jiao Tong University800 Dong Chuan RoadShanghai 200240China School of Materials Science and Engineering Tongji University1239 Siping RoadShanghai 200092China Key Laboratory of Safety Science of Pressurized System(Ministry of Education) ScHool of Mechanical and Power EngineeringEast China University of Science and Technology130 Meilong RoadShanghai 200237China

Graphene has attracted much attention as a new nano-carbon for its unique structure and properties. However, production and dispersion of unfunctionalized graphene are still big challenges. Herein, we demonstrate a simple method for preparation and dispersion of such graphene with low cost and non toxicum. This approach is achieved by exfoliating graphite in an ethanol/water mixture and forming stable dispersion of mono- and few-layer graphenes. The ratio of ethanol/water in the mixture is found to be crucial to both the exfoliation and dispersion processes. Exfoliation in pure water or pure ethanol produces no graphene. This method avoids the conventional use of harsh oxidants and surfactants; therefore, the graphitic structure is well maintained without destruction. Benefiting from the use of ethanol and water, it can be easy to prepare transparent and conductive graphene films by vacuum filtering or spray method, and does not need special post-treatment to remove the impurity, which could be beneficial for potential applications in electronic, optic and energy areas.

关键词： graphene liquid-phase exfoliation transparent conductive film solubilityparameter

Mono-Allylation of Gem-Diacetates with Allylsamarium Bromide

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Chinese Chemical Letters 2001年第11期12卷 943-944页

作者： xiao xia wang Yong Min ZHANG Department of Chemistry Zhejiang University(Xixi Campus)Hangzhou 310028 Laboratory of Organometallic Chemistry Chinese Academy of SciencesShanghai 200032

The substitution reaction between gem-diacetates and allylsamarium bromide was investigated, and homoallylic alcohol acetates were obtained in moderate to good yields.

关键词： gem-diacetates substitution monoallylation allylsamarium bromide

Effect of Continuous Positive Airway Pressure Therapy on Glycemic Excursions and Insulin Sensitivity in Patients with Obstructive Sleep Apnea-hypopnea Syndrome and Type 2 Diabetes

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Chinese Medical Journal 2015年第17期128卷 2301-2306页

作者： Li-Xin Guo Xin Zhao Qi Pan Xue Sun Hui Li xiao-xia wang Li-Na Zhang Yao wang Department of Endocrinology Beijing Hospital Beijing 100730 China Department of General Medicine First Hospital of China Medical University Shenyang Liaoning 110001 China

Background： For patients with obstructive sleep apnea-hypopnea syndrome （OSAHS） and type 2 diabetes mellitus （T2DM）, the night sleep interruption and intermittent hypoxia due to apnea or hypopnea may induce glycemic excursions and reduce insulin sensitivity. This study aimed to investigate the effect of continuous positive airway pressure （CPAP） therapy in patients with OSAHS and T2DM. Methods： Continuous glucose monitoring system （CGMS） was used in 40 patients with T2DM and newly diagnosed OSAHS. The measurements were repeated after 30 days of CPAP treatment. Subsequently, insulin sensitivity and glycohemoglobin （HbAlc） were measured and compared to the pretreatment data. Results： After CPAP therapy, the CGMS indicators showed that the 24-h mean blood glucose （MBG） and the night time MBG were significantly reduced （P 〈 0.05 and P = 0.03, respectively）. The mean ambulatory glucose excursions （MAGEs） and the mean of daily differences were also significantly reduced （P 〈 0.05 and P = 0.002, respectively） compared to pretreatment levels. During the night, MAGE also significantly decreased （P = 0.049）. The differences between the highest and lowest levels of blood glucose over 24 h and during the night were significantly lower than prior to CPAP treatment （P 〈 0.05 and P = 0.024, respectively）. The 24 h and night time durations of high blood glucose （〉7.8 mmol/L and 〉 11.1 mmol/L） decreased （P 〈 0.05 and P 〈 0.05, respectively） after the treatment. In addition, HbA 1 c levels were also lower than those before treatment （P 〈 0.05）, and the homeostasis model assessment index of insulin resistance was also significantly lower than before CPAP treatment （P = 0.034）. Conclusions： CPAP therapy may have a beneficial effect on improving not only blood glucose but also upon insulin sensitivity in T2DM patients with OSAHS. This suggests that CPAP may be an effective treatment for T2DM in addition to intensive diabetes management.

关键词： Continuous Glucose Monitoring System Continuous Positive Airway Pressure Obstructive Sleep Apnea-hypopnea Syndrome Type 2 Diabetes Mellitus

Overexpression of IQGAP1 in human pancreatic cancer

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Hepatobiliary & Pancreatic Diseases International 2013年第5期12卷 540-545页

作者： xiao-xia wang xiao-Zhong Li Li-Qin Zhai Zhi-Rong Liu xian-Jiu Chen Yi Pei Department of Biochemistry and Molecular Biology Shanxi Medical University Department of Geriatric Oncology Shanxi Academy of Medical SciencesShanxi Dayi Hospital Department of Emergency Shanxi Provincial People's Hospital Department of Pathology Shanxi Provincial People's Hospital

BACKGROUND:Pancreatic cancer is a highly aggressive malignant tumor with the lowest survival rate.A better understanding of the molecular mechanisms which contribute to pancreatic cancer occurrence and progression will aid in the development of new approaches to the early diagnosis,prevention,and treatment of this deadly disease.The scaffold protein IQGAP1 shows elevated levels in a variety of cancer types.Currently,we investigated whether or not IQGAP1 is also overexpressed in pancreatic cancer.METHODS:IQGAP1 expression was examined in pancreatic cancer and normal tissues adjacent to cancerous tissues(adjacent tissues)by Western blotting and real-time RT-PCR as well as in paraffin sections of tissue microarray by immunohistochemistry.The correlations between IQGAP1 expression and various clinicopathological characteristics were analyzed.RESULTS:Western blotting and real-time RT-PCR revealed that the levels of IQGAP1 protein and mRNA expression in pancreatic cancer tissues were significantly increased compared with adjacent tissues.Immunohistochemistry analysis on tissue microarray showed that IQGAP1 protein expression was significantly higher in pancreatic cancer(80.0%,48/60)compared with adjacent tissues(18.3%,11/60)(P<0.001).Moreover,overexpression of IQGAP1 was shown to be associated with the grades of tumor differentiation(P<0.05).CONCLUSION:The overexpression of IQGAP1 may play an important role in pancreatic cancer occurrence and progression,and IQGAP1 may serve as a novel molecular target for the diagnosis and treatment of pancreatic cancer.

关键词： IQGAP1 pancreatic cancer tissue microarray immunohistochemistry

Cefoperazone sodium/sulbactam sodium vs piperacillin sodium/tazobactam sodium for treatment of respiratory tract infection in elderly patients

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World Journal of Clinical Cases 2021年第29期9卷 8694-8701页

作者： xiao-xia wang Cheng-Tai Ma Yan-xia Jiang Yun-Jie Ge Fa-Yun Liu Wen-Gang Xu Department of Cadre Health Qingdao Municipal HospitalQingdao 266011Shandong ProvinceChina Department of Emergency Medicine The Affiliated Hospital of Qingdao UniversityQingdao 266011Shandong ProvinceChina Department of Pathology The Affiliated Hospital of Qingdao UniversityQingdao 266011Shandong ProvinceChina Department of Pulmonary Shandong Qingdao Hospital of Integrated Traditional Chinese and Western MedicineQingdao 266011Shandong ProvinceChina

BACKGROUND Respiratory tract infections in the elderly are difficult to cure and can easily recur,thereby posing a great threat to patient prognosis and quality of life.AIM To investigate the therapeutic effects of different antibiotics in elderly patients with respiratory tract infection.METHODS Seventy-four elderly patients with respiratory tract infection were randomly allocated to a study(n=37;treated with cefoperazone sodium/sulbactam sodium)or control(n=37;treated with piperacillin sodium/tazobactam sodium on the basis of routine symptomatic support)group.Both groups were treated for 7 d.Time to symptom relief(leukocyte recovery;body temperature recovery;cough and sputum disappearance;and rale disappearance time),treatment effect,and laboratory indexes[procalcitonin(PCT),C-reactive protein(CRP),white blood cell count(WBC),and neutrophil percentage(NE)]before and 7 d after treatment and the incidence of adverse reactions were assessed.RESULTS In the study group,the time to WBC normalization(6.79±2.09 d),time to body temperature normalization(4.15±1.08 d),time to disappearance of cough and sputum(6.19±1.56 d),and time to disappearance of rales(6.68±1.43 d)were shorter than those of the control group(8.89±2.32 d,5.81±1.33 d,8.77±2.11 d,and 8.69±2.12 d,respectively;P=0.000).Total effective rate was higher in the study group(94.59%vs 75.68%,P=0.022).Serum PCT(12.89±3.96μg/L),CRP(19.62±6.44 mg/L),WBC(20.61±6.38×10^(9)/L),and NE(86.14±7.21%)levels of the study group before treatment were similar to those of the control group(14.05±4.11μg/L,18.79±5.96 mg/L,21.21±5.59×10^(9)/L,and 84.39±6.95%,respectively)with no significant differences(P=0.220,0.567,0.668,and 0.291,respectively).After 7 d of treatment,serum PCT,CRP,WBC,and NE levels in the two groups were lower than those before treatment.Serum PCT(2.01±0.56μg/L),CRP(3.11±1.02 mg/L),WBC(5.10±1.83×10^(9)/L),and NE(56.35±7.17%)levels were lower in the study group than in the control group(3.29±0.64μg/L,5.67±1.23 mg/L,8.13±3.01×10^(9)/L,and 64.22±8.08%,respectively;P=

关键词： Cefoperazone sodium Sulbactam sodium Piperacillin sodium Tazobactam sodium Respiratory tract infection Elderly

Association of image-defined risk factors,tumor resectability,and prognosis in children with localized neuroblastoma

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World Journal of Pediatrics 2019年第6期15卷 572-579页

作者： An-An Zhang Ci Pan Min Xu xiao-xia wang Qi-Dong Ye Yi-Jin Gao Jing-Yan Tang Key Laboratory of Pediatric Hematology and Oncology Ministry of HealthDepartment of Pediatric Hematology and OncologyShanghai Children's Medical CenterShanghai Jiaotong University School of Medicine(SJTU-SM)ShanghaiChina

Background Although localized neuroblastoma has a good prognosis,some cases have undergone treatment failure or recur-rence.Apart from biologic features such as MYCN status,we wondered whether some characteristics of growing tumors are prognostic,such as a well-encapsulated mass without infiltration of vital organs.We analyzed the diagnostic utility of image-defined risk factors(IDRFs)to predict successful treatment and prognosis.The overall goal was to achieve maximum cure rates for patients with localized neuroblastoma through a better understanding of clinical characteristics.Methods We retrospectively reviewed the images of patients with localized neuroblastoma who were enrolled between June 1998 and December 2012 at a single institution in Shanghai,China.Unequivocal categorization regarding IDRFs was available in 67 patients.IDRF was assessed at diagnosis and after four cycles of neoadjuvant chemotherapy,on average.The median follow-up period was 84 months(range: 48-132 months)after diagnosis.Results MRI and CT indicated a total of 177 IDRFs in these 67 patients.Logistic regression analysis revealed a highly significant negative correlation between the numbers of IDRFs and the possibility of complete removal of neuroblastoma.Intraspinal extension of the tumor,compression of the trachea,and encasement of the main artery in localized neuroblastoma were predictors for incomplete tumor resection.According to univariate analysis,≥4 IDRFs and intraspinal extension of the tumor were significant indicators of poor prognosis.Conclusions The number of IDRFs was useful in predicting surgical outcome and event-free survival.The number of IDRFs should be considered in protocol planning,instead of IDRF presence or absence.

关键词： Image-defined risk factors Localized neuroblastoma Prognosis Surgery

Clinical application of Bushen Jianpi Gutai Decoction in threatened abortion

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Drug Combination Therapy 2022年第1期4卷 10-14页

作者： Xiu-Rong wang Yi-Ru Liu xiao-Ying Meng Kui-Mei Zhang xiao-xia wang Wen-Ming Cao Department of Obstetrics&Gynecology Changle People's HospitalChangle 262400China

Objective:To discuss the clinical application of the"seven,five and three"odd-numbered law theory and analyze the effect on serum sex hormone level.Methods:A total of 100 patients with early threatened abortion admitted from January 2021 to October 2021 were randomly divided into study group and control group,with 50 patients in each group.Patients in the control group were treated with dydrogesterone tablets,while patients in the study group were treated with Bushen JianpiGutai Decoction combined with dydrogesterone tablets.Clinical efficacy and progesterone level before and after treatment were observed and compared between the two groups,as well as clinical symptom relief time of the two groups,including hemostasis time,abdominal pain relief time and lumbar acid relief time,and sex hormone level of the two groups were observed and compared.Results:The clinical efficacy was significantly better than control patients(P0.05),significantly better than control patients(Pxia Guicheng,master the key date and the best time of its transformation,regulate Yin and Yang in the female body,to prevent the occurrence and development of menstrual diseases and adverse childbirth.Bushen Jianpi Gutai decoction can effectively treat threatened abortion,significantly improve the clinical symptoms,improve the level of serum sex hormone,worthy of clinical promotion.

关键词： Yin and Yang of female body Bushen Jianpi Gutai Decoction Early threatened abortion Odd-numbered law theory

Silicon-erbium ytterbium silicate nanowire waveguides with optimized optical gain

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Frontiers of physics 2017年第1期12卷 57-63页

作者： xiao-xia wang Wei-Hao Zheng Qing-Lin Zhang xiao-Li Zhu Hong Zhou Xiu-Juan Zhuang An-Lian Pan xiang-Feng Duan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province School of Physics and Electronic Science and State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University Changsha 410082 China Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA

Single-crystal erbium silicate nanowires have attracted considerable attention because of their high optical gain. In this work, we report the controlled synthesis of silicon-erbium ytterbium silicate core- shell nanowires and fine-tuning the erbium mole fraction in the shell from x = 0.3 to x = 1.0, which corresponds to changing the erbium concentration from 4.8 ×10^21 to 1.6 ×10^22 cm^-3. By controlling and properly optimizing the composition of erbium and ytterbium in the nanowires, we can effectively suppress upeonversion photoluminescence while simultaneously enhancing near-infrared emission. The composition-optimized nanowires have very long photoluminescence lifetimes and large emission cross- sections, which contribute to the high optical gain that we observed. We suspended these concentration- optimized nanowires in the air to measure and analyze their propagation loss and optical gain in the near-infrared communication band. Through systematic measurements using wires with different core sizes, we obtained a maximum net gain of 20 ± 8 dB·mm^-1, which occurs at a wavelength of 1534 nm, for a nanowire with a diameter of 600 nm and a silicon core diameter of 300 nm.

关键词： erbium ytterbium silicate nanowire erbium concentration gain

New Proof for Some Terminating Hypergeometric Series Identities

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Journal of Mathematical Research and Exposition 2011年第1期31卷 115-122页

作者： xiao xia wang Department of Applied Mathematics Shanghai University Shanghai 200444 P. R. China

The Abel＇s lemma on summation by parts is employed to evaluate terminating hypergeometric series. Several summation formulae are reviewed and some new identities are established.

关键词： Abel＇s lemma on summation by parts classical hypergeometric series