检索结果-南通市图书馆

前方到站PCIE ATi&nVIDIA最新PCIE显卡完全评测

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电脑自做 2004年第11期 29-43页

作者： ue3Master SPY

PC的更新换代一般都是随着总线的升级而进行的．在上一次的更替中PCI代替了ISA成为了PC中总线的标准．自那以后PC的基本结构也就没有多大的变化了。到了2004年．人们越来越感到PCI总线面对日益增长的数据传输要求而力不从心，Intel适时... 详细信息

PC的更新换代一般都是随着总线的升级而进行的．在上一次的更替中PCI代替了ISA成为了PC中总线的标准．自那以后PC的基本结构也就没有多大的变化了。到了2004年．人们越来越感到PCI总线面对日益增长的数据传输要求而力不从心，Intel适时地推出了PCI—Express(下文简称PCIE)总线标准，即迎合了人们的需求．也达到了借机巩固自己在个人电脑领域领导者地位的目的。

关键词： ATI 显卡 PCI总线总线标准个人电脑 ISA 评测需求适时地位

Simple Modifications to Standard TRIzol®Protocol Allow High-Yield RNA Extraction from Cells on Resorbable Materials

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 Biomaterials and Nanobiotechnology 2011年第1期2卷 41-48页

作者： juliana Tsz Yan Lee Wai Hung Tsang King Lau Chow 不详

Resorbable bioceramics are attractive for medical applications such as bone substitution. Biochemical analysis on cells cultured on these biomaterials is vital to predict the impact of the materials in vivo and RNA extraction is an essential step in gene expression study using RT-qPCR. In this study, we describe simple modifications to the TRIzol? RNA extraction protocol widely used in biology and these allow high-yield extraction of RNA from cells on resorbable calcium phosphates. Without the modifications, RNA is trapped in the co-precipitated calcium compounds, rendering TRIzol? extraction method infeasible. Among the modifications, the use of extra TRIzol? to dilute the lysate before the RNA precipitation step is critical for extraction of RNA from porous ?-tricalcium phosphate (?-TCP) discs. We also investigate the rationale behind the undesirable precipitation so as to provide clues about the modifications required for other resorbable materials with high application potential in bone tissue engineering.

关键词： Calcium Phosphate Resorbable Materials RNA Extraction TRIzol Acid Guanidium Thiocyanate - Phenol - Chloroform Extraction TRI Reagent TRIsure

Brazilian Maize Landraces Silks as Source of Lutein: An Important Carotenoid in the Prevention of Age-Related Macular Degeneration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2012年第11期3卷 1609-1614页

作者： Shirley Kuhnen Paulo Fernando Dias juliana Bernardi Ogliari Marcelo Maraschin Biochemistry and Animal Morphophysiology Laboratory Departament of Zootechny and Rural Development CCA Federal University of Santa Catarina (UFSC) Florianopolis-SC Brazil Laboratory of Studies in Bioactivity and Animal Morphogenesis Departament of Cell Biology Embriology and Genetics CCB Block-D Federal University of Santa Catarina (UFSC) Florianopolis-SC Brazil Plant Morphogenesis and Biochemistry Laboratory CCA Federal University of Santa Catarina (UFSC) Florianopolis-SC Brazil. Studying Group in Agricultural Biodiversity Departament of Phytotechny CCA Federal University of Santa Catarina (UFSC) Florianopolis-SC Brazil

The carotenoid composition of the silk tissue of Zea mays (L.) has not been investigated despite its large occurrence in maize grains. For the purpose of evaluating maize silk as a source of carotenoids, samples from eight landraces developed and cultivated in Southern Brazil were assayed. The silk samples were harvested from individual plants through the fourth and seventh day after they emerged, frozen in liquid N2, and lyophilized. The carotenoids were extracted with a MeOH/toluene solution (1:1, v/v), 30 min, and saponified (15% KOH, 12 h, 40℃). The RP-HPLC-UV-visible analysis revealed lutein as the main carotenoid (88.75%) in maize silks, with a wide range of contents (dry weight), i.e. 39.11 ?g?g-1 (Palha Roxa 18) to 176.12 ?g?g-1 (Língua de Papagaio) among the studied genotypes. Smaller amounts of trans-β-carotene, α-carotene, and zeaxanthin were also detected. The results revealed that in parallel to the claimed high genetic variability of maize landraces, a quite variable carotenoidic composition of silk tissue seems to occur in the germoplasm cultivated in Southern Brazil. Taking into account the usage of lutein for the prevention of several pathologies, especially the age related macular degeneration, some maize landraces (e.g. Língua de Papagaio and Rosado) might be interesting sources of a lutein-rich extract that could add value to an underutilized biomass.

关键词： Lutein Maize Landraces Silks

Predicting of the Fibrous Filters Efficiency for the Removal Particles from Gas Stream by Artificial Neural Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Chemical Engineering and Science 2015年第3期5卷 317-327页

作者： érica Regina Filletti juliana Maria da Silva Valdemir Garcia Ferreira Department of Physical Chemistry Institute of Chemistry S&#227 o Paulo State University-UNESP Araraquara Brazil Institute of Science and Technology Federal University of Alfenas Po&#231 os de Caldas Brazil Department of Applied Mathematics and Statistics Institute of Mathematics and Computer Sciences University of S&#227 o Paulo S&#227 o Carlos Brazil

In this paper, artificial neural networks are used for predicting single fiber efficiency in the process of removing smaller particles from gas stream by fiber filters. For this, numerical simulations are obtained of a classic model of literature for fiber efficiency, which is numerically solved along with the convection diffusion equation in polar coordinates for particle concentration, with associated initial and boundary conditions. A sufficient number of examples from two numerical simulations are employed to construct a database, from which parameters of a novel neural model are adjusted. This model is constructed based on the back propagation algorithm in order to map two features, namely Peclet number and packing density, which are extracted from the numerical simulations into the corresponding single fiber efficiency. The results indicate that the developed neural model can be trained in a reasonable computational time and is capable of estimating single fiber efficiency from examples of the test set with a maximum error of 1.7%.

关键词： Artificial Neural Network Back Propagation Algorithm Fiber Filters Particle Capture

Lipid Oxidation in Mechanically Deboned Chicken Meat:Effect of the Addition of Different Agents

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2013年第8期4卷 219-223页

作者： juliana Bigolin Cleusa Ines Weber Alexandre da Trindade Alfaro Department of Food Technology Federal Technological University of Paraná(UTFPR)Francisco BeltraoBrazil

The study evaluated the effect of sodium chloride (1.5%), sodium erythorbate (0.5% and 1.0%) and ascorbic acid (0.1% and 0.2%) on inhibiting lipid oxidation in mechanically deboned chicken meat (MDCM). The peroxide, acidity, pH, color and odor values of the samples were determined on the 1st, 3rd and 5th days. Treatments with sodium erythorbate and ascorbic acid had significant influence (p ≤ 0.05) on the peroxide, acidity and pH values. Ascorbic acid and erythorbate sodium were especially effective in reducing lipid oxidation in mechanically deboned chicken meat.

关键词： MDCM Lipid Oxidation Agents

Technique to Obtain Mitotic Chromosomes of <i>Conyza bonariensis</i>L. Cronquist (Asteraceae)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2015年第9期6卷 1466-1474页

作者： juliana Maria de Paula Cecília Alzira Ferreira Pinto-Maglio Programa de Pós-Graduação em Genética Melhoramento Vegetal e Biotecnologia Centro de Pesquisa e Desenvolvimento de Recursos Genéticos Vegetais Instituto Agron&ocircmico de Campinas Campinas Brazil Centro de Pesquisa e Desenvolvimento de Recursos Genéticos Vegetais Instituto Agron&ocircmico de Campinas Campinas Brazil

Cytogenetic analysis requires cytological preparations that unequivocally reveal the chromosome number and permit optimal visualizations of chromosome morphology for the construction of karyotypes and ideograms. Chromosomal characterization is possible only by establishing these two parameters. To cytogenetically characterize the weed Conyza bonariensis (L.) Cronquist (Asteraceae), it was necessary to improve cytological analysis techniques to obtain optimal results. This species belongs to a genus whose plants have wide phenotypic plasticity. These plants can be morphologically differentiated by other types of analysis, and thus the application of this technique will serve as a reference for cytogenetical analysis of other groups of plants that have cytogenetic characteristics similar to those of C. bonariensis. The methodology described here highlights three main protocol steps: 1) root tip collection from newly germinated seed radicles and from young root tips of mature plants, 2) pretreatment of meristems with antimitotic agents, both isolated and combined, and 3) acid and enzymatic hydrolytic processes.

关键词： Hairy Fleabane Cytogenetics Chromosomes Weed

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

可溶性免疫复合物在临床免疫学中的地位

国际免疫学杂志 1986年第2期09卷 91-93页

作者： Nydegger ue ,陈敬贤

对于免疫复合物的生理病理学意义已经一致公认,相比之下,它们的检出对于疾病描述和治疗的实用性却存在明显的争议.免疫复合物的形成是浆细胞大规模合成抗体的合理结果.免疫复合物将抗原提呈给吞噬细胞清除;也可将抗原送到淋巴样组织的... 详细信息

对于免疫复合物的生理病理学意义已经一致公认,相比之下,它们的检出对于疾病描述和治疗的实用性却存在明显的争议.免疫复合物的形成是浆细胞大规模合成抗体的合理结果.免疫复合物将抗原提呈给吞噬细胞清除;也可将抗原送到淋巴样组织的生发中心,从而引起更强的抗体应答.如果抗原是外来的,上述过程对机体有利;如果是自身抗原,这种由免疫复合物介导的清除将是有害的.

关键词：免疫复合物疾病抗原体液临床免疫学类风湿因子类风湿性关节炎因子

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

在初冬,想念一场三月的樱花

龙门阵 2015年第11期 22-31页

作者： juliana

有一天，juliana带上画本，搭上了飞往东京的班机。这是她第几趟日本之行，也许要翻开往昔的日志数一数。在那场仍有白雪的春天里，她走走停停，写写画画。有时候学习日语，有时候参观民宿，有时候只是坐下来，在浸着橘香的窗边，听一... 详细信息

有一天，juliana带上画本，搭上了飞往东京的班机。这是她第几趟日本之行，也许要翻开往昔的日志数一数。在那场仍有白雪的春天里，她走走停停，写写画画。有时候学习日语，有时候参观民宿，有时候只是坐下来，在浸着橘香的窗边，听一堂经，看一树樱花盛开。

关键词：文学文学作品当代作品现代文学

Student’s Academic Efficacy or Inefficacy?An Example on How to Evaluate the Psychometric Properties of a Measuring Instrument and Evaluate the Effects of Item Wording

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Statistics 2014年第6期4卷 484-493页

作者： Joao Maroco Ana Lucia Maroco juliana Alvares Duarte Bonini Campos Unidade de Investigacao em Psicologia e Saude Instituto Superior de Psicologia Aplicada(ISPA)LisboaPortugal Departamento de Odontologia Social Faculdade de Odontologia de AraraquaraUNESPUniversidade Estadual PaulistaAraraquaraBrazil

This study evaluated the effect of item inversion on the construct validity and reliability of psychometric scales and proposed a theoretical framework for the evaluation of the psychometric properties of data gathered with psychometric instruments. To this propose, we used the Maslach Burnout Inventory, which is the most used psychometric inventory to measure burnout in different professional context (Students, Teachers, Police, Doctors, Nurses, etc…). The version of the MBI used was the MBI-Student Survey (MBI-SS). This inventory is composed of three key dimensions: Exhaustion, Cynicism and Professional Efficacy. The two first dimensions—which have positive formulated items—are moderate to strong positive correlated, and show moderate to strong negative correlations with the 3rd dimension—which has negative formulated items. We tested the hypothesis that, in college students, formulating the 3rd dimension of burnout as Inefficacy (reverting the negatively worded items in the Efficacy dimension) improves the correlation of the 3rd dimension with the other two dimensions, improves its internal consistency, and the overall MBI-SS’ construct validity and reliability. Confirmatory factor analysis results, estimated by Maximum Likelihood, revealed adequate factorial fit for both forms of the MBI-SS (with Efficacy) vs. the MBI-SSi (with Inefficacy). Also both forms showed adequate convergent and discriminant related validity. However, reliability and convergent validity were higher for the MBI-SSi. There were also stronger (positive) correlations between the 3 factors in MBI-SSi than the ones observed in MBI-SS. Results show that positively rewording of the 3rd dimension of the MBI-SS improves its validity and reliability. We therefore propose that the 3rd dimension of the MBI-SS should be named Professional Inefficacy and its items should be positively worded.

关键词： Burnout Maslach Burnout Inventory-Student Survey Validity Reliability Item Inversion