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1.
Molecular structure and granule morphology of native and heat‐moisture‐treated pinhão starch 下载免费PDF全文
Vania Z. Pinto Khalid Moomand Nathan L. Vanier Rosana Colussi Franciene A. Villanova Elessandra R. Zavareze Loong‐Tak Lim Alvaro R. G. Dias 《International Journal of Food Science & Technology》2015,50(2):282-289
Pinhão seed is an unconventional source of starch and the pines grow up in native forests of southern Latin America. In this study, pinhão starch was adjusted at 15, 20 and 25% moisture content and heated to 100, 110 and 120 °C for 1 h. A decrease in λ max (starch/iodine complex) was observed as a result of increase in temperature and moisture content of HMT. The ratio of crystalline to amorphous phase in pinhão starch was determined via Fourier transform infra red by taking 1045/1022 band ratio. A decrease in crystallinity occurred as a result of HMT. Polarised light microscopy indicated a loss of birefringence of starch granules under 120 °C at 25% moisture content. Granule size distribution was further confirmed via scanning electron microscopy which showed the HMT effects. These results increased the understanding on molecular and structural properties of HMT pinhão starch and broadened its food and nonfood industrial applications. 相似文献
2.
DNA double-strand breaks are very genotoxic lesions that can result in chromosome aberrations. The current view is that DNA double-strand breaks are repaired most efficiently through homologous recombination in yeast and simple end-joining in mammalian cells. However, recent experiments reveal that both repair pathways are conserved from yeast to mammals, including humans. The challenge ahead is to put the different pieces of the jigsaw together into coherent mechanisms for both pathways and to determine their relative contributions to ionizing-radiation resistance and to the prevention of genetic instability and carcinogenesis. 相似文献
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Alvaro E. Gil Author Vitae Author Vitae 《Automatica》2006,42(2):245-250
Resource allocation involves deciding how to divide a resource of limited availability among multiple demands in a way that optimizes current objectives. In this brief paper we focus on one type of distributed resource allocation problem where via an imperfect communication network multiple processors can share the load presented by multiple task types. We introduce asynchronous “cooperative” resource allocation strategies, and show that they lead to a bounded cumulative demand. 相似文献
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Examined the relationship between aphasia type and lesion site in 80 subcortical stroke patients. Ss were classified as affected by aphasia, dysarthria, and nonaphasia, nondysarthria. Sites of lesions were identified by means of computerized tomography (CT) scan. No correlation between site of lesions and category group was found. Lesions of the same subcortical structures yielded different neurolinguistic impairment, whereas comparable linguistic patterns were observed with lesions of different deep areas. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Alvaro Realpe 《Powder Technology》2006,169(2):108-113
A large part of pharmaceutical manufacturing involves the use of particulate materials. It is well known that both particle size and shape affect the physical characteristics of tablets. An image processing and analysis algorithm based on the invariant image moment technique was developed in this work to determine the particle shape by comparing features (moments) extracted from templates to those extracted from each of the objects in the image. First it determines the particle shape (rectangle, circle, etc.) and then calculates its specific dimensions (diameter, aspect ratio).The statistical validation of the vision system obtained a repeatability of 0.0012 in and 0.5% relative standard deviation and accuracy within 0.1 to 0.9% of the average value considered as true value. Also the pattern recognition technique indicated high precision and accuracy for images containing particles with some level of contact between them. The shape recognition of microcrystalline cellulose (MCC) indicated that particles of equant and acicular shape as defined by USP are predominant. The results suggest that image processing and analysis would be a suitable tool for pharmaceutical process analytical technologies (PAT) and process optimization. 相似文献
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Juan Chirinos Jose Arévalo Tamara Rajmankina Angel Morillo Darmenia Ibarra Ali Bahsas Alvaro Parada 《Polymer Bulletin》2004,51(5-6):381-387
Summary The complex
5-(C5H5)2Ti
(1-OC(O)C6H5)2
was synthesized and activated with MA0 for ethylene
polymerization. The resultant polymer is UHMW-PE with a
viscosimetric molecular weight of Mv = 6.8 x
106 to 0.7 x
106 g/mol dependent on the
temperature of the reaction. The effects of the Al/Ti molar
ratio and temperature of the reaction on the catalytic activity
and polymer properties were studied. 相似文献
10.
Alvaro Chacon 《新世纪水泥导报》2007,13(Z1):45-47
随着能源成本的增加,水泥行业不断寻求利用石油焦炭等替代燃料,但这些替代燃料的使用增加了物料在预热器、窑、冷却机中的阻塞和堆积。对物料的堵塞和堆积,常用的清除方法会带来许多弊端。利用空气炮防止物料的阻塞和堆积比较有效,可以从熟料质量、熟料产量、耐火材料寿命、能源、安全性等方面达到降低成本的目的。马丁公司在预热器和冷却器的改造方面与水泥行业有非常紧密的合作,墨西哥水泥厂是这种合作关系成功的典范。从1996年至今,墨西哥水泥厂已经安装了大约2900个马丁公司的BIG BLASTER空气炮,每年因为安装空气炮带来的收益达27万美元。基于此,UCC万吨熟料生产线也不例外地选用于马丁公司的空气炮。 相似文献