检索结果-南通市图书馆

Thermoluminescence Response and Its Deconvolution on Crystalline Higher Order Mixtures of Alkali Halides Exposed to Gamma-Rays for Dosimetric Use

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 Chemistry and Chemical Engineering 2012年第12期6卷 1093-1098页

作者： Ricardo rodriguez Mijangosl G. Vazquez-Polo R. Perez-Salas1 P. gonzalez-Martinez Departamento de Investigaci6n en Fisica Universidad de Sonora. Hermosillo 83190 México Instituto de Fisica UNAM A. P. 20-364 01000 México D. F. Mdxico. Instituto Nacional de Investigaciones Nucleares A. P. 52750 Carretera México-Toluca s/n La Marquesa Estado de MéxicoMéxico

Alkali halides crystals have been the subject of intense research. High order crystalline one phase mixtures （high order： more that binary） studied by TL （thermoluminiscence technique） proved having persistent peaks along the time after the radiation to which they are exposed. In general in alkali halide crystals the traps associated with highest recorded temperature peaks in the TL due to radiation damage have greater permanence in time too. These features are useful for dosimetric applications. In this work, temperature thermoluminescence glow peaks of ternary and quaternary mixed alkali halide crystals have been studied. The study has been focused on their high temperature glow peaks after being subjected to thermal treatments at 373, 573, and 673 K. The glow peaks of high temperature were isolated and studied 24 h and 48 h after irradiation. The parameters of the recombination processes associated to these peaks were obtained using a glow peak shape method. Orders of kinetics were higher than 1.0 and the activation energy greater than 1.2 eV. The results suggest that such materials have a high potential as dosimeter and energy storage materials.

关键词： Thermoluminiscence alkali halide mixed crystals gamma radiation dosimetry.

缩略语和美国俚语——美国常用缩略语和首字母缩略语概观

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

外语教学理论与实践 1993年第4期 44-48页

作者： Felix rodriguez gonzalez 陈培良第四军医大学

缩略语,特别是首字缩母略语,构成了一个当今语言最突出的特征。在以不断的技术变革和各种新体制大量介入为特点的时代里,缩略语为制定术语提供了简便的方法。如果说语言总是倾向于讲究经济简便,如果说演说家和作家总是倾向于言简意赅,... 详细信息

缩略语,特别是首字缩母略语,构成了一个当今语言最突出的特征。在以不断的技术变革和各种新体制大量介入为特点的时代里,缩略语为制定术语提供了简便的方法。如果说语言总是倾向于讲究经济简便,如果说演说家和作家总是倾向于言简意赅,那么面对着那些为了给新事物命名而源源不断地创造出来的繁琐的短语和名称,使用缩略语就更有必要了。这样形成的词毫无疑问地给语言增添了一层规范的且具有行语特点的色彩。除了这种高技术的客观术语以外,我们从许多职业性和社会性团体的语言中还发现了与这些术语差别很大的词语。这类缩略语口语性强且不规范,通常被归入“俚语”类,因为它们源于满足表达欲和情感的需要,同时创造一种团体内人人平等的感觉。

关键词：口语性缩略词行语人人平等理语帕特里奇禁忌语委婉语外语教学上义

Optimization of the bioconversion of glycerol to ethanol using Escherichia coli by implementing a bi-level programming framework for proposing gene transcription control strategies based on genetic algorithms

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

Advances in Bioscience and Biotechnology 2012年第4期3卷 336-343页

作者： Carol Milena Barreto-rodriguez Jessica Paola Ramirez-Angulo Jorge Mario Gomez-Ramirez Luke Achenie Andres Fernando gonzalez-Barrios Grupo de Diseno de Productos y Procesos(GDPP) Department of Chemical EngineeringUniversidad de los AndesBogotaColombia Multiscale and Multiphysics Modeling Lab Department of Chemical EngineeringVirginia Polytechnic Institute and State UniversityBlacksburgVirginia

In silico approaches for metabolites optimization have been derived from the flood of sequenced and annotated genomes. However, there exist still numerous degrees of freedom in terms of optimization algorithm approaches that can be exploited in order to enhance yield of processes which are based on biological reactions. Here, we propose an evolutionary approach aiming to suggest different mutant for augmenting ethanol yield using glycerol as substrate in Escherichia coli. We found that this algorithm, even though is far from providing the global optimum, is able to uncover genes that a global optimizer would be incapable of. By over-expressing accB, eno, dapE, and accA mutants in ethanol production was augmented up to 2 fold compared to its counterpart E. coli BW25113.

关键词： Bi-level Optimization Escherichia coli Metabolic Flux Analysis Genetic Algorithm

Nucleation of Fe-Rich Intermetallic Phases on α-Al_(2)O_(3) Oxide Films in Al-Si Alloys

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 Minerals and Materials Characterization and Engineering 2015年第1期3卷 15-25页

作者： Pilar Orozco-gonzalez Manuel Castro-Roman Simitrio Maldonado-Ruiz Sergio Haro-rodriguez Fabian Equihua-Guillen Rodrigo Muniz-Valdez Salvador Luna-Alvarez Miguel Montoya-Davila Alejandra Hernandez-rodriguez Academic Unit of Engineering Autonomous University of ZacatecasZacatecasMexico CINVESTAV Saltillo SaltilloMexico Faculty of Engineering Autonomous University of CoahuilaMexico

Nucleation of Fe-rich intermetallic phases on α-Al2O3 oxide films was analyzed in five experimental Al-Fe-Mn-Si alloys. In an attempt to verify the role of α-Al2O3 films in nucleating Fe-rich intermetallics, experiments have been conducted under conditions where formed in situ oxide films were present. Some Fe-rich intermetallics are observed to be related with the oxide films in the microstructure, the present results are in accordance with some research that suggest that the Fe-rich intermetallic phases nucleate upon the oxide films. The intermetallic phases and α-Al2O3 films were unambiguously identified with the help of complementary techniques such as thermal analysis, SEM/EDS and X-ray diffraction.

关键词： Aluminum Alloys Intermetallics Nucleation Crystal Growth Oxide Films

Effect of Nitrogen Deficiency and Toxicity in Two Varieties of Tomatoes(Lycopersicum esculentum L.)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences 2014年第14期5卷 1361-1368页

作者： Noemi Frias-Moreno Abelardo Nunez-Barrios Ramona Perez-Leal Ana Cecilia gonzalez-Franco Adriana Hernandez-rodriguez Loreto Robles-Hernandez Plant Physiology Laboratory Facultad de Ciencias AgrotecnologicasUniversidad Autonoma de ChihuahuaChihuahuaMéxico

Tomato is one of the most important vegetables cultivated in Mexico. Nitrogen-based fertilizers have greatly contributed to the increase in tomato production;however, the excessive application of this fertilizer may affect yield and fruit quality. A greenhouse experiment was conducted to evaluate the effect of increasing in rates of nitrogen from deficiency to toxic levels. Five N-treatments (0, 15, 30, 45 and 60 mM of N) were applied in two tomato varieties, Caballero and Victoria The optimum N doses for leaf growth in both varieties was 30 mM reaching 13.0 and 13.5 cm in Caballero and Victoria respectively. At low toxic levels leaf growth was recovered more easily in Caballero than Victoria. Nitrate concentration for the low toxicity treatment was greater in leaf and stems for Caballero than Victoria;conversely nitrate in fruits was higher in Victoria. Final yield per plant was not statistically different between varieties except at the low toxic treatment where Caballero had a yield of 780 g per plant compared to that of 330 g per plant of Victoria. Tomato quality was also affected by the applied N-doses, where treatment 30 mM reached the maximum fruit firmness in both varieties while high toxic N-levels decreased significantly this parameter. Soluble solids and titratable acidity increased with increased N-Doses. Caballero variety seems to be more tolerant than Victoria at low levels of N-toxicity.

关键词： Tomato Nitrogen Deficiency Toxicity

Re-emerging threat of Trypanosoma cruzi vector transmission in El Salvador, update from 2018 to 2020

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2022年第4期11卷 101-102页

作者： Marvin Stanley rodriguez Yuko Nitahara Michelle Cornejo Kevin Siliezar Rafael Grande Ana gonzalez Kotaro Tasaki Yu Nakagama Yu Michimuko Yoko Onizuka Junko Nakajima-Shimada Jose Eduardo Romero Jose Ricardo Palacios Carmen Elena Arias Wilam Mejia Yasutoshi Kido Ricardo Cardona Alvarenga Department of Virology and Parasitology Graduate School of MedicineOsaka Metropolitan University1-4-3 Asahi-machiAbeno-kuOsaka 545-8585 Japan 不详

Background:Since the late twentieth century,Chagas disease gained global attention to suppress the vector burden as a main control strategy in endemic *** Central America,multi-national initiative successfully achieved significant reduction in the estimated disease prevalence as well as elimination of the region's principal vector species at the time in *** the last decade has witnessed significant changes in ecosystem-such as urbanization and replacement of the main vector species-that can possibly affect the vector's habitation and residual transmission,the up-to-date vector burden in the region has not been evaluated thoroughly due to the cessation of active vector *** aim of this study was to update the risk of vector-borne Trypanosoma cruzi infection in El Salvador,the top Chagas disease-endemic country in Central ***:A nationwide vector survey was conducted in the domestic environment of El Salvador from September 2018 to November *** selection of the houses for inspection was based on expert purposeful *** for *** was examined by microscopic observation of the insects'feces,followed by a species confrmation using *** data were analyzed using R software version *** estimates with 95%confidence intervals were inferred using the Jeffrey's method provided under the epiR ***:A total of 1529 Triatoma dimidiata was captured from 107 houses(infestation rate,34.4%;107/311)in all the fourteen departments of the country visited within the period;prevalence of *** infection was as high as 10%(153/1529).In the country,domestic *** infestation was distributed ubiquitously,while *** infection rates varied across the *** out of fourteen departments showed higher infection rates than the average,suggesting sporadic high-risk areas in the ***:Our comprehensive study revealed substantial *** infection of *** across the country,in

关键词： Chagas disease Vector transmission Triatomine Trypanosoma cruzi Triatoma dimidiata

Oral allopurinol to prevent hyperamylasemia and acute pancreatitis after endoscopic retrograde cholangiopancreatography

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 2009年第13期15卷 1600-1606页

作者： Hector Martinez-Torres Xochilt rodriguez-Lomeli Carlo Davalos-Cobian Jesus Garcia-Correa Juan Manue Maldonado-Martinez Fabiola Medrano-Muoz Clotilde Fuentes-Orozco Alejandr gonzalez-Ojeda Department of Gastroenterology an Endoscopy UMAE-Hospital de Especialidades del Centr Medico Nacional de Occidente-IMSS Research Unit in Clinical Epidemiology UMAE-Hospital de Especialidades del Centro Medico Naciona de Occidente-IMSS

AIM:To assess the efficacy of allopurinol to prevent hyperamylasemia and pancreatitis after endoscopic retrograde cholangiopancreatography(PEP).METHODS:One hundred and seventy patients were enrolled and randomized to two groups:a study group(n=85)who received 300 mg of oral allopurinol at 15 h and 3 h before endoscopic retrograde cholangiopancreatography(ERCP)and a control group(n=85)receiving an oral placebo at the same *** Outcome Measurements included serum amylase levels and the number severity of the episodes of *** amylase levels were classified as normal(151 IU/L).Episodes of PEP were classified following Ranson's criteria and CT severity ***:Gender distribution was similar between *** age was 53.5±18.9 years for study group and 52.8±19.8 years for ***,the distribution of benign pathology was similar between *** was more common in the control group(P=0.003).Mild PEP developed in two patients from the study group(2.3%)and eight(9.4%) from control group(P=0.04),seven episodes were observed in high-risk patients of the control group(25%) and one in the allopurinol group(3.3%,P=0.02).Risk factors for PEP were precut sphincterotomy(P=0.02),pancreatic duct manipulation(P=0.002)and multiple procedures(P=0.000).There were no deaths or side ***:Oral allopurinol before ERCP decreased the incidences of hyperamylasemia and pancreatitis in patients submitted to high-risk procedures.

关键词： Endoscopic retrograde cholangiopancreatography Hyperamylasemia Acute pancreatitis Oralallopurinol Risk factors

Estimate of the Crystallization Kinetics in Stoichiometry Compositions Films of Ge:Sb:Te

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 Surface Engineered Materials and Advanced Technology 2012年第1期2卷 44-46页

作者： Carlos Virgilio Rivera rodriguez Eduardo Morales Sanchez Jesus gonzalez Hernandez Evgen Prokhorov Juan Munoz Saldana Gerardo Trapaga Martinez Ciencias Ambientales del Instituto Nacional de Investigaciones Nucleares La MarquesaMexico CICATA-IPN Unidad Queretaro QueretaroMexico Centro de Investigacion en Materiales Avanzados ChihuahuaMexico CINVESTAV-Qro. QueretaroMexico

The aim of this work is to compare the isothermal crystallization kinetic in the films along GeTe-Sb2Te3 line with composition Ge2Sb2Te5, Ge1Sb2Te4 Ge1Sb4Te7 and Ge4Sb1Te5 using mainly Johnson–Mehl–Avrami-Kolmogorov (JMAK) model. Results obtained have shown different crystallization mechanism in the investigated films. In Ge2Sb2Te5 and Ge1Sb2Te4 films the analysis of the kinetic results (Avrani coefficient) showed that at the beginning of crystallization a metastable phase appeared with the Ge1Sb4Te7 composition, this is followed by the nucleation and growth of the stable fcc phase up to full crystallization. In contrast Ge4Sb1Te5 and Ge1Sb4Te7 films show diffusion control growing from small dimension grains with decreasing nucleation rate.

关键词： Crystallization Ge:Sb:Te JMAK Model

Recirculating chemohyperthermia as a treatment for non-muscle invasive bladder cancer:Current and future perspectives

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 Clinical Urology 2017年第2期6卷 34-39页

作者： Javier Flores-Carbajal Alejandro Sousa-Escandón Daniel Sousa-gonzalez Silvia rodriguez Gomez Manuel Lopez Saavedra M Elia Fernandez Martinez Comarcal Hospital of Monforte

About 75% of all bladder cancer diagnosed are non-muscle invasive bladder cancer(NMIBC), recurring over 50% of them after transurethral resection of the bladder tumor. In order to prevent recurrences, adjuvant intravesical chemotherapy with mitomycin C and immunotherapy with bacillus Calmette-Gu-érin(BCG) is traditionally used. Unfortunately, many patients relapse after receiving these treatments and a significant proportion of them require surgery. After a one-to-three years BCG maintenance, the risk for progression at 5 years was 19.3% for T1G3 tumors. Many new treatment approaches are being investigated to increase the effectiveness of adjuvant intravesical therapy. One of the developing treatments for intermediate and high-risk NMIBC is the combination of intravesical chemotherapy and hyperthermia, called chemohyperthermia. This article provides a review of the mechanism of action, current status and indications, results and future perspectives.

关键词： Bladder cancer Thermotherapy Non-muscle invasive Chemohyperthermia Recirculating Intravesical chemotherapy Treatment Mechanism of action