蜜饯果脯类食品中二氧化硫测定方法研究分析

[目的]建立一种适合实验室简便快速地测定蜜饯中二氧化硫的方法。[方法]利用全自动蛋白测定仪中蒸馏装置与全玻璃蒸馏的原理相同,分别用2种蒸馏方法对50批蜜饯样品的二氧化硫进行测定,测定结果采用t检验分析。[结果]分析表明,全自动蛋白测定仪蒸馏法与GB/T 5009.34第二法全玻璃蒸馏法测定蜜饯果脯类食品中二氧化硫的结果无显著差异。[结论]利用全自动蛋白测定仪蒸馏法测定二氧化硫,方法简便省时,结果准确可靠,适合蜜饯果脯类食品中二氧化硫的测定。     

Glass transition behavior of corn distillers dried grains with solubles (DDGS)

Distillers dried grains with solubles (DDGS), a major co-product from the corn ethanol industry, has high feed value for its chemical composition. The ratio of wet distillers grains (WDG) and condensed distillers solubles (CDS) added during the production process determines the chemical composition of DDGS. Effect of changing this ratio and the influence of moisture content on glass transition behavior of DDGS was studied. Five prediction models were evaluated to explain the glass transition of DDGS. The mixed trends in the result indicated the complex behavior of DDGS particles and revealed that both moisture content and chemical composition impact the glass transition behavior of DDGS. Onset glass transition temperature ranged from 20 to 30 °C depending on the chemical composition. Kwei equation predictions were better than the predictions by Gordon-Taylor equation. The glass transition temperature of DDGS can be mathematically explained by combining the moisture content and chemical components protein, fiber, glycerol, and sugar percent. The artificial neural network (ANN) model gave a better prediction of onset and midpoint glass transition temperature of DDGS and this might be due to the accurate mapping of the interaction between chemical components.     

《玻璃动物园》的象征手法

美国当代戏剧家威廉斯.田纳西于1944年创作的《玻璃动物园》获得了很大成功。剧作中的故事发生在一个普通的家庭里,家庭成员性格上的缺陷导致了故事最终以悲剧而结束。     

水稻细菌性条斑病种子劳菌检测技术研究：Ⅱ.离体检测法

 经3年研究建立了一套用离体稻叶检测稻种带细条病菌的方法，应用该方法成功地将44份自然发病的细条病病种接种到离体稻叶上并产生菌脓。甩1％水琼脂加90 ppm无毒苯口并咪唑．在30℃下可使水稻幼苗的离体叶保持15～20 d，可满足细条病接种发病的时间需要。应用纯菌测定该方法的灵敏度，最低可检测浓度为5×10^3 Cells／ml。由于选择了最佳的温度、湿度/光照、苗龄及其它有关环境条件， 使1．2～4．0 g的病种经研碎浸泡后浓缩针刺接种干离体稻叶上在3 d后出现病斑，5.5～8.5 d后产生菌脓，与其它血清学检测方法相比，离体检测法具有直观、可靠、简便、稳定等优点。特别可避免由于种子携带丧失活性的细条病菌或其它病菌而引起的误诊。     

研磨珠辅助提取茶树菇水溶性核苷酸工艺优化

为了考察茶树菇中水溶性核苷酸的较优提取工艺,该文以食用真菌茶树菇子实体为原料,采用研磨珠细胞破壁提取法,对其所含的核苷酸类物质进行提取。以研磨时间、液料比及研磨珠装载量作为影响因素,采用响应面分析法进行条件优化,得到具显著性的拟合回归方程,并确定最佳提取工艺条件为：研磨时间12 min,液料比为51∶1 mL/g,研磨珠装载量为12.5%时,理论核苷酸得率为7.02%。并且,通过验证试验,实际得率为6.94%,结果与模型符合良好,进一步说明拟合方程的可靠。与传统方法相比,本文采用的研磨珠破壁提取方法,不仅所得核苷酸产品得率高,并且可大大缩短操作时间,为食用菌核苷酸的新型生产工艺的开发提供了理论参考。     

Testing Method and Heat insulating Principle of the Thermal Insulation Coatings for External Wall

Abstract：In the modern society due to the increasingly high requirements on the environment circumstances, it is imperative to study the insulation coating.This paper introduces the testing method and heat insulating principle of the building external wal     

Morphology and mechanical properties of thermo-molded bioplastics based on glycerol-plasticized wheat gliadins

Glycerol-plasticized wheat gliadin bioplastics were prepared through thermo-molding method. The effect of glycerol content on the morphology and the mechanical properties of wheat gliadin bioplastics was studied. Morphology, tensile properties (tensile strength and elongation at break), dynamic mechanical properties and rheological properties were evaluated in relation to glycerol content. Experimental results reveal that the morphology, the glass transition temperatures (T_g) of both the gliadin-rich and the glycerol-rich domains and the tensile properties are closely linked to the glycerol content. The time–temperature superposition (TTS) fails to be applied to the dynamic loss modulus G″ (all temperatures) and the dynamic storage modulus G′ (above 80 °C) of wheat gliadin bioplastics.     

种子理化反应与种子衰老关系的研究进展

植物种子衰老是一个十分复杂的过程,是各种理化反应和生理生化反应的综合结果。国外几个研究小组近10年的研究证实,种子细胞质以玻璃态存在,其玻璃化转变温度与种子衰老密切相关,而玻璃化温度又与种子中的糖、蛋白等物质有关。还有一些研究表明,种子中存在被称为美拉德反应和阿马多瑞反应的非酶促反应,这些反应可以在种子水分含量极低的条件下发生,其产物在种胚内的积累成为种子衰老的原因,其机理可能是通过降低抗氧化酶的活性、修饰蛋白质、核酸的结构和功能、影响种子中糖代谢等途径进而引起种子衰老。     

高效中华绒蟹微卫星文库的构建及其七个位点的特征分析

一次富集回收产物与生物素标记探针杂交,运用磁珠亲和捕捉构建中华绒螯蟹微卫星文库。96个阳性克隆双向测序结果为75个克隆含有微卫星,登录号为DQ388769~DQ388807,表明二次富集法是一种快速高效的分离微卫星的方法。7个微卫星位点的特征分析显示,ES10位点是复制位点;ES37可能有空位点;其它5个位点可用于中华绒螯蟹的品种鉴定、遗传多样性和群体结构研究。     

Surgical excision of a feline orbital lacrimal gland adenocarcinoma with adjunctive cryotherapy and carboplatin‐impregnated bead implantation

The purpose of this report was to discuss the diagnosis, treatment, and outcome of a cat with an orbital lacrimal gland adenocarcinoma. A 14.5‐year‐old spayed female domestic shorthair cat was evaluated for a firm swelling at the left dorsotemporal orbital rim. The orbital mass was excised with preservation of the globe, and adjunctive cryotherapy was performed. A definitive diagnosis of lacrimal gland adenocarcinoma was obtained after histopathologic evaluation and histochemical staining with periodic acid–Schiff and mucicarmine. Thirteen months postoperatively, tumor regrowth occurred with a much larger osteolytic lesion, and a second surgery was performed consisting of tumor excision with implantation of carboplatin‐impregnated calcium sulfate hemihydrate beads. The cat has remained free of recurrence 11 months after the second surgery (26 months after initial diagnosis and surgery). A feline orbital lacrimal gland adenocarcinoma was successfully managed utilizing globe‐preserving surgical excision with adjunctive cryotherapy and subsequent carboplatin‐impregnated bead implantation. Orbital lacrimal gland adenocarcinoma in cats may not be as aggressive as other forms of periocular, head, and neck adenocarcinomas.