检索结果-南通市图书馆

Elucidation of thermally induced internal porosity in zinc oxide nanorods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第5期11卷 2412-2423页

作者： Albertus D. Handoko laura-lynn liew Ming lin Gopinathan Sankar Yonghua Du Haibin Su Zhili Dong gregory K. l. Goh Institute of Materials Research and Engineering Agency for Science Technology and Research (A＊STAR) Singapore 138634 Singapore School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Department of Chemistry University College London London WC1H0AJ UK Institute of Chemical and Engineering Sciences Agency for Science Technology and Research (A＊STAR) Singapore 627833 Singapore

In situ electron microscopy, tomography, photoluminescence, and X-ray absorption spectroscopy were utilized to monitor and explain the formation and growth of internal pores within ZnO nanorods. Careful examination using electron microscopy and tomography indicate that nanosized intemal pores start appearing within the individual solution-grown ZnO nanorods upon exposure to 200 ℃. The pore volume growth rate is proportional to the heat treatment time, indicating that the process is diffusion controlled, akin to a reverse Ostwald ripening-like process. A manageable pore growth rate of 1.4-4.4 nm^3·min^-1 was observed at 540 ℃, suggesting that the effective control over internal porosity can be achieved by carefully controlling the heat-treatment profile. Mechanistic studies using X-ray absorption spectroscopy indicated that the pore formation is linked to the significant reduction of the number of zinc vacancies after heat treatment. An optimum condition exists where most of the native surface defects are removed, while the bulk defects are contained within the internal pores. It is also demonstrated that the internal porosity can be exploited to improve the visible light absorption of ZnO. A combination of the lower defect density and improved light absorption of the heat-treated ZnO films thus lead to an increase in the photo- electrochemical response of more than 20× compared to that of the as-grown ZnO.

关键词： zinc oxide solution growth hydrothermal porosity photocatalysis photocurrent

Potential of the neonicotinoid imidacloprid and the oxadiazine indoxacarb for controlling five coleopteran pests of stored grain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2012年第1期19卷 96-101页

作者： gregory J. Daglish Manoj K. Nayak Agri-Science Queensland Department of Employment Economic Development and Innovation Brisbane Queensland Australia

The potential for using imidacloprid （a neonicotinoid） and indoxacarb （an oxadiazine） as grain protectants was investigated in bioassays against resistant strains of five stored grain beetles. The species investigated were Rhyzopertha dominica （E）（the lesser grain borer）, Sitophilus oryzae （l.）（the rice weevil）, Tribolium castaneum （Herbst）（the rust-red flour beetle）, Oryzaephilus surinamensis （l.）（the saw tooth flour beetle）, and Cryptolestesferrugineus （Stephens）（the fiat grain beetle）. Each of these species has developed resistance to one or more protectants, including organophosphorus insecticides, synthetic pyrethroids and the juvenile hormone analogue methoprene. Mortality and re- production after a 2-week exposure of adults to treated wheat depended on species, dose and insecticide. Imidacloprid had no effect on S. oryzae at any dose, but none of the other species produced any live progeny at 10 mg/kg. Indoxacarb had no effect on T. castaneum at any dose, but none of the other species produced any live progeny at 5 mg/kg. The results show that although both imidacloprid and indoxacarb can control at least four of the five key pests tested at doses comparable to those used for organophosphorus protectants, more potent neonicotinoid or oxadiazine insecticides would be needed than either of these to provide broad spectrum protection of stored grain .

关键词： beetles imidacloprid indoxacarb stored grain

Induction of chronic cholestasis without liver cirrhosis-Creation of an animal model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第23期23卷 4191-4199页

作者： Felix Dondorf RenéFahrner Michael Ardelt Eleonora Patsenker Felix Stickel Uta Dahmen Utz Settmacher falk Rauchfuβ Department of General Visceral and Vascular SurgeryJena University Hospital Division of Gastroenterology and Hepatology University Hospital Zürich

To analyze time intervals of inflammation and regeneration in a cholestatic rat liver *** 36 lewis rats, divided into six groups of 6 animals (postoperative observation periods: 1, 2, 3, 4, 6, 8 wk), the main bile duct was ligated with two ligatures and observed for the periods mentioned above. For laboratory evaluation, cholestasis parameters (bilirubin, γ-GT), liver cell parameters (ASAT, AlAT) and liver synthesis parameters (quick, albumin) were determined. For histological analysis, HE, EvG, ASDCl and HMGB-1 stainings were performed. Furthermore, we used the mRNA of Il-33, GADD45a and p-21 for analyzing cellular stress and regeneration in cholestatic *** chemical laboratory and histological evaluation, a distinction between acute and chronic cholestatic liver injury with identification of inflammation and regeneration could be demonstrated by an increase in cholestasis (bilirubin: 1-wk group, 156.83 ± 34.12 μmol/l, P = 0.004) and liver cell parameters (ASAT: 2-wk group, 2.1 ± 2.19 μmol/l.s, P = 0.03; AlAT: 2-wk group, 1.03 ± 0.38 μmol/l.s, P = 0.03) after bile duct ligation (BDl). Histological evaluation showed an increase of bile ducts per portal field (3-wk group, 48 ± 6.13, P = 0.004) during the first four weeks after bile duct ligation. In addition to inflammation, which is an expression of acute cholestasis, there was an increase of necrotic areas in the histological sections (2-wk group, 1.38% ± 2.28% per slide, P = 0.002). Furthermore, the inflammation could be verified by ASDCl (4-wk group, 22 ± 5.93 positive cells per portal field, P = 0.041) and HMGB-1 [2-wk group, 13 ± 8.18 positive cells per field of view (FoV), P = 0.065] staining. Therefore, in summary of the laboratory evaluation and histological studies, acute cholestasis could be found during the first four weeks after bile duct ligation. Subsequently, the described parameters declined so that chronic cholestasis could be assumed. For quantification of secondary biliary ci

关键词： Rats Cholestasis Chronic cholestasis Rat liver model

Zhejiang Province-land of Plenty

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Today 1998年第3期47卷 46-50页

作者： gregory, P.l

Ｚｈｅｊｉｎｈｚｐｔｏｖｉｎｅ－ＬａｎｄｏｆＰｌｅｎｔｙＲｉｃｈｉｎｃｕｌｔｕｒａｌ，ｈｕｍａｎａｎｄｎａｔｕｒａｌｒｅｓｏｕｒｃｅｓ，ＺｈｅｊｉａｎｇｉｓｏｎｅｏｆＣｈｉｎａ＇ｓｍｏｓｔｐｒｏｇｒｅｓｓｉｖｅｐｒｏ... 详细信息

Ｚｈｅｊｉｎｈｚｐｔｏｖｉｎｅ－ＬａｎｄｏｆＰｌｅｎｔｙＲｉｃｈｉｎｃｕｌｔｕｒａｌ，ｈｕｍａｎａｎｄｎａｔｕｒａｌｒｅｓｏｕｒｃｅｓ，ＺｈｅｊｉａｎｇｉｓｏｎｅｏｆＣｈｉｎａ＇ｓｍｏｓｔｐｒｏｇｒｅｓｓｉｖｅｐｒｏｖｉｎｃｅｓ．ＢＹＰＬＧＲＥＧＯＲ...

关键词： Zhejiang Province-land of Plenty

Endophytic fungi alter sucking bug responses to cotton reproductive structures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2017年第6期24卷 1003-1014页

作者： gregory A. Sword Ashley Tessnow Maria Julissa Ek-Ramos Department of Entomology Texas A&M University College Station Texas USA Ecology and Evolutionary Biology Interdisciplinary Program Texas A&M University College Station Texas USA laboratorio de Inmunologia y Virologia Facultad de Ciencias BiolSgicas Universidad Autonoma de Nuevo Leon San Nicolas de los Garza Nuevo Leon Mexico

All plants including cotton host a wide range of microorganisms as endophytes. There is a growing appreciation of the prevalence, ecological significance and management potential of facultative fungal endophytes in protecting plants from pests, pathogens and environmental stressors. Hemipteran sucking bugs have emerged as major pests across the U.S. cotton belt, reducing yields directly by feeding on developing reproductive structures and indirectly by vectoring plant pathogens. We used no-choice and simultaneous choice assays to examine the host selection behavior of western tarnished plant bugs （lygus hesperus） and southern green stink bugs （Nezara viridula） in response to developing flower buds and fruits from cotton plants colonized by 1 of 2 candidate beneficial fungal endophytes, Phialemonium inflatum or Beauveria bassiana. Both insect species exhibited strong negative responses to flower buds （l. hesperus） and fruits （N. viridula） from plants that had been colonized by candidate endophytic fungi relative to control plants under both no-choice and choice conditions. Behavioral responses of both species indicated that the insects were deterred prior to contact with plant tissues from endophyte-colonized plants, suggesting a putative role for volatile compounds in mediating the negative response. Our results highlight the role of fungal endophytes as plant mutualists that can have positive effects on plant resistance to pests.

关键词： behavior endophyte fungi Hemiptera mutualism sucking bug

Oral anti-coagulants use in Chinese hospitalized patients with atrial fibrillation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第2期137卷 172-180页

作者： Jing lin Deyong long Chenxi Jiang Caihua Sang Ribo Tang Songnan li Wei Wang Xueyuan Guo Man Ning Zhaoqing Sun Na Yang Yongchen Hao Jun liu Jing liu Xin Du louise Morgan Gregg C.Fonarow Sidney C.Smith Jr gregory Y.H.lip Dong Zhao Jianzeng Dong Changsheng Ma On behalf of CCC-AF investigators Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityBeijing 100029China National Clinical Research Center for Cardiovascular Diseases Beijing 100029 China Department of Epidemiology Beijing Anzhen HospitalCapital Medical UniversityBeijing Institute of HeartLung and Blood Vessel DiseasesBeijing 100029China International Quality Improvement Department American Heart AssociationDallasTX 07076USA Division of Cardiology Geffen School of Medicine at University of CaliforniaLos Angeles CA 90024USA Division of Cardiology University of North CarolinaChapel HillNC 27599USA Department of Cardiology Liverpool Centre for Cardiovascular ScienceUniversity of Liverpool and Liverpool Heart&Chest HospitalLiverpool L143PEUK Department of Clinical Medicine Aalborg UniversityAalborg 9000Denmark 不详

Background:Oral anti-coagulants(OAC)are the intervention for the prevention of stroke,which consistently improve clinical outcomes and survival among patients with atrial fibrillation(AF).The main purpose of this study is to identify problems in OAC utilization among hospitalized patients with AF in ***:Using data from the Improving Care for Cardiovascular Disease in China-Atrial Fibrillation(CCC-AF)registry,guideline-recommended OAC use in eligible patients was ***:A total of 52,530 patients with non-valvular AF were enrolled from February 2015 to December 2019,of whom 38,203 were at a high risk of stroke,9717 were at a moderate risk,and 4610 were at a low *** admission,only 20.0%(6075/30,420)of patients with a diagnosed AF and a high risk of stroke were taking *** use of pre-hospital OAC on admission was associated with a lower risk of new-onset ischemic stroke/transient ischemic attack among the diagnosed AF population(adjusted odds ratio:0.54,95%confidence interval:0.43-0.68;Pligible patients with high stroke risk and 60.7%(2778/4578)in eligible patients with low stroke *** utilization in patients with high stroke risk on admission or at discharge both increased largely over time(all Pltivariate analysis showed that OAC utilization at discharge was positively associated with in-hospital rhythm control strategies,including catheter ablation(adjusted odds ratio[OR]11.63,95%confidence interval[CI]10.04-13.47;Plectronic cardioversion(adjusted OR 2.41,95%CI 1.65-3.51;Plusions:In hospitals participated in the CCC-AF project,>70%of AF patients were at a high risk of *** poor performance on guideline-recommended OAC use was found in this study,over time the CCC-AF project has made progress in stroke prevention in the Chinese AF ***

关键词： Atrial fibrillation Oral anti-coagulants OAC Stroke prevention Contraindication

A Rare Case of Concordant Atrioventricular Connection to l-looped Ventricles in Situs Solitus:4-Dimensional Magnetic Resonance Imaging and 3D Printing

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Congenital Heart Disease 2022年第4期17卷 387-392页

作者： gregory Perens Takegawa Yoshida J.Paul Finn UClA Mattel Children’s Hospital Children’s Heart CenterLos AngelesCAUSA Diagnostic Cardiovascular Imaging laboratory Department of Radiology12222 David Geffen School of Medicine at UCLALos AngelesCAUSA

An infant male presented with the rare anatomy consisting of situs solitus,concordant atrioventricular connections to l-looped ventricles,double outlet right ventricle(DORV),and hypoplastic aortic arch.6 months after neonatal aortic arch repair,the morphologic right ventricle function deteriorated,and surgical evaluation was undertaken to determine if either biventricular repair with a systemic morphologic left ventricle or right ventricular exclusion was *** initial echocardiography,magnetic resonance imaging(MRI)was used to create detailed axial and 4-dimensional(4D)images and 3-dimensional(3D)printed *** detailed anatomy of this rare,complex case and its use in pre-surgical planning is presented.

关键词： Magnetic resonance imaging cardiac segments 3D printing

Current advancements on charge selective contact interfacial layers and electrodes in flexible hybrid perovskite photovoltaics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第3期30卷 151-173页

作者： Gopalan Saianand Prashant Sonar gregory J.Wilson Anantha-Iyengar Gopalan Vellaisamy A.l.Roy Gautam E.Unni Khan Mamun Reza Behzad Bahrami K.Venkatramanan Qiquan Qiao Global Centre for Environmental Remediation(CCER) Faculty of ScienceThe University of NewcastleCallaghan 2308New South WalesAustralia CSIRO Energy Newcastle Energy Centre10 Murray Dwyer CctMayfield WestNSW 2304Australia School of Chemistry and Physics Queensland University of Technology(QUT)2 George StreetBrisbaneQLD 4001Australia Centre for Material Science Queensland University of Technology(QUT)BrisbaneQLD 4000Australia Daegyeong Regional Infrastructure Technology Development Center Kyungpook National UniversityDaegu 41566Republic of Korea James Watt School of Engineering University of GlasgowG128QQUnited Kingdom Facufty of Engineering and Built Environment The University of NewcastleCallaghan 2308New South WalesAustralia Department of Electrical Engineering Center for Advanced PhotovoltaicsSouth Dakota State UniversityBrookings 57007South DakotaUSA Department of Physics SCSVMV Deemed UniversityKanchipuram 631561Tamil NaduIndia

Perovskite-based photovoltaic materials have been attracting attention for their strikingly improved performance at converting sunlight into *** beneficial and unique optoelectronic characteristics of perovskite structures enable researchers to achieve an incredibly remarkable power conversion *** hybrid perovskite photovoltaics promise emerging applications in a myriad of optoelectronic and wearable/portable device applications owing to their inherent intriguing physicochemical and photophysical properties which enabled researchers to take forward advanced research in this growing *** perovskite photovoltaics have attracted significant attention owing to their fascinating material properties with combined merits of high efficiency,light-weight,flexibility,semitransparency,compatibility towards roll-to-roll printing,and large-area mass-scale *** perovskite-based solar cells comprise of 4 key components that include a flexible substrate,semi-transparent bottom contact electrode,perovskite(light absorber layer)and charge transport(electron/hole)layers and top(usually metal)*** these components,interfacial layers and contact electrodes play a pivotal role in influencing the overall photovoltaic *** this comprehensive review article,we focus on the current developments and latest progress achieved in perovskite photovoltaics concerning the charge selective transport layers/electrodes toward the fabrication of highly stable,efficient flexible *** a concluding remark,we briefly summarize the highlights of the review article and make recommendations for future outlook and investigation with perspectives on the perovskite-based optoelectronic functional devices that can be potentially utilized in smart wearable and portable devices.

关键词： Perovskite photovoltaics Charge transport layers Contact interface layer Contact electrodes Printable electronics

Stability study on an anti-cancer drug 4-(3,5-bis(2-chlorobenzylidene)-4-oxo-piperidine-1-yl)-4-oxo-2-butenoic acid (ClEFMA) using a stabilityindicating HPlC method

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2017年第1期7卷 1-9页

作者： Dhawal Raghuvanshi gregory Nkepang Alamdar Hussain Hooman Yari Vibhudutta Awasthi Department of Pharmaceutical Sciences University of Oklahoma Health Science Center 1110 N. Stonewall Avenue Oklahoma City OK 73117 USA

ClEFMA, 4-(3,5-bis(2-chlorobenzylidene)-4-oxo-piperidine-1-yl)-4-oxo-2-butenoic acid, is a new chemical entity with anti-cancer and anti-inflammatory activities. Here, we report its stability in solution against stress conditions of exposure to acid/base, light, oxidant, high temperature, and plasma. The identity of the degradation products was ascertained by mass and proton nuclear magnetic resonance spectroscopy. To facilitate this study, we developed and validated a reverse phase high performance liquid chromatography method for detection of ClEFMA and its degradation. The method was linear over a range of 1–100 μg/m l; the accuracy and precision were within acceptable limits; it was stability-indicating as it successfully separated cis-/trans-isomers of ClEFMA as well as its degradation product. The major degradation product was produced from amide hydrolysis at maleic acid functionality caused by an acidic buffer, oxidant(3% hydrogen peroxide),or temperature stress(40–60 °C). The log k-p H profile showed that ClEFMA was most stable at neutral p H. In accelerated stability study we found that the shelf-life(T_(90%)) of ClEFMA at 25 °C and 4 °C was 45 days and220 days, respectively. Upon exposure to UV-light(365 nm), the normally prevalent trans-ClEFMA attained cis-configuration. This isomerization also involved the maleic acid moiety. ClEFMA was stable in plasma from which it could be efficiently extracted by an acetonitrile precipitation method. These results indicate that ClEFMA is sensitive to hydrolytic cleavage at its maleic acid moiety, and it is recommended that its samples should be stored under refrigerated and light-free conditions, and under inert environment.

关键词： ClEFMA HPlC Stability Shelf-life Isomerization