拱形屋面空旷建筑基础的实用设计

拱形屋面结构单层空旷建筑的基础偏心距较大，用常规设计方法基础面积过大，使这种结构在实际工程中的应用受到限制。分析了这种结构的受力特点，针对我国的工程实际，提出了改进基础设计的几种方法：1)加大基础自重，利用基础梁把墙体的重力传给基础；2)采用复合基础，将条形基础和独立基础浇筑成整体，使条形基础承担部分弯矩和剪力；3)风荷载较小且没有吊车时采用偏心基础，相当于预先给基础施加适当的反向弯矩。工程实例表明，与常规设计相比，采用复合基础设计的独立基础底面积较小，降低了基础高度，混凝土体积减小约30％。降低了工程造价，方便基础施工。     

高产节水小麦基因型生理特性及综合评价

 应用4个年度的研究资料，综合分析了高产节水小麦基因型的生理特性。研究表明，叶水势、气孔阻力、蒸腾强度和离体叶片失水速率品种间均存在明显差异。根据最高产量、少水/足水产量比、叶水势、气孔阻力、蒸腾强度和离体叶片失水速率提出了综合评价高产节水小麦基因型的标准。     

表面张力法研究表面活性剂和肌酸激酶相互作用

】本文利用表面张力法研究了十二烷基硫酸钠（ＳＤＳ）和溴化十二烷基三甲铵（Ｃ１２ＮＭ３）与肌酸激酶（Ｃ．Ｋ．）的相互作用。结果表明，当ＳＤＳ为０．０５ｍＭ时，ＳＤＳ开始“明显”和Ｃ．Ｋ．结合。在溶液的ｐＨ＜６．０（Ｃ．Ｋ．的等电点）时，于０．２～１．２ｍＭ的浓度范围内，ＳＤＳ可引起Ｃ．Ｋ．的沉淀。在溶液的ｐＨ＞８．０时，于０．６～４．５ｍＭ的浓度范围内，Ｃ１２ＮＭ３可引起Ｃ．Ｋ．沉淀。Ｃ．Ｋ．和ＳＤＳ的结合量随溶液ｐＨ和ＳＤＳ浓度的增加而增加     

苹果渣浸液培养嗜酸乳杆菌条件的研究

以苹果鲜渣为原料,利用嗜酸乳杆菌发酵其浸提液,以活菌数为主要指标,通过单因素试验和响应面分析(RSM)对发酵条件进行优化,确定嗜酸乳杆菌发酵苹果渣浸液的最佳工艺条件为:料水比为1:8～1:10,100℃浸提50～60 min,过滤,添加1.56%酵母粉,1.54%乳清粉,发酵28.14 h,活菌数可达到5.24×109 cfu/ml。     

白水生姜组培脱毒及离体快繁体系建立研究

以白水生姜茎尖为材料进行组培脱毒及离体快繁体系建立研究,结果表明,姜块催芽并在40～45℃光照箱中热处理30 d,再结合微茎尖（0.1～0.3 mm）分生组织培养,能有效脱除白水生姜烟草花叶病毒（TMV）和黄瓜花叶病毒（CMV）。以MS为基本培养基,添加6-BA 2.0 mg/L、NAA 0.1 mg/L有利于茎尖诱导分化;最适试管苗增殖培养基为MS＋6-BA 3.0 mg/L＋NAA 0.03 mg/L,增殖系数达7倍,丛芽叶绿、壮,长势好;生根培养基以MS＋NAA 0.5 mg/L＋IBA0.1 mg/L为宜,生根率达100%,纤维根多。     

Interactions between mitochondrial lipid oxidation and oxymyoglobin oxidation and the effects of vitamin E

Off-flavor and discoloration of meat products result from lipid oxidation and myoglobin (Mb) oxidation, respectively, and these two processes appear to be interrelated. The objective of this study was to investigate their potential interaction in mitochondria and the effects of mitochondrial alpha-tocopherol concentrations on lipid oxidation and metmyoglobin (MetMb) formation in vitro. The addition of ascorbic acid and ferric chloride (AA-Fe(3+)) increased ovine and bovine mitochondrial lipid oxidation when compared with their controls (p < 0.05); MetMb formation also increased with increased lipid oxidation relative to controls (p < 0.05). Reactions containing Mb and mitochondria with greater alpha-tocopherol concentrations demonstrated less lipid oxidation and MetMb formation than mitochondria with lower alpha-tocopherol concentrations. Greater mitochondrial alpha-tocopherol concentration was also correlated with increased mitochondrial oxygen consumption in vitro and with a more pronounced effect at pH 7.2 than at pH 5.6. Relative to controls, succinate addition to bovine mitochondria resulted in increased concentrations of ubiquinol 10 and alpha-tocopherol and decreased lipid and Mb oxidation (p < 0.05). Mitochondrial lipid oxidation was closely related to MetMb formation; both processes were inhibited by alpha-tocopherol in a concentration-dependent manner.     

土茯苓切面不同颜色总多糖的提取工艺优选

为优选不同切面颜色土茯苓中总多糖的最佳提取工艺,以获得较高含量的土茯苓多糖,采用蒽酮-硫酸比色法、正交试验法对土茯苓中总多糖提取工艺进行优化。结果表明:以总多糖为指标,土茯苓切面红色的最佳提取工艺为蒸馏水作溶剂,85℃回流提取1.5h,料液比1∶10(g/mL),提取3次,提取率达19.40%;土茯苓切面白色的最佳提取工艺为蒸馏水作溶剂,95℃回流提取2h,料液比1∶30(g/mL),提取1次,提取率为48.43%。     

Color stability, reducing activity, and cytochrome c oxidase activity of five bovine muscles

The objective was to characterize the beef psoas major (PM), longissimus lumborum (LL), superficial semimembranosus (SSM), deep semimembranosus (DSM), and semitendinosus (ST) muscles for differences in instrumental and visual color, metmyoglobin-reducing activity (MRA), total reducing activity (TRA), and cytochrome c oxidase activity. The LL and ST had the most color stability and MRA (p < 0.05), the DSM and PM had the least (p < 0.05), and values for the SSM were intermediate. Visual color (r = -0.66) and a and chroma (r = 0.68) were more correlated with MRA than with TRA (r < 0.14 for all measures). This research supports previous reports that color stability among muscles is variable and that MRA is more useful than TRA for explaining the role of reducing activity in muscle-color stability.     

唇形科植物提取物对肉鸡生长性能、性能和肉品质的影响研究

试验旨在研究饲料中添加不同浓度止痢草植物提取物(OS)对内鸡生长性能、屠宰性能及肉品质的影响.试验采用单因子设计,选用1日龄同批孵化AA+肉鸡2 400只,随机分为6个处理,每个处理8个重复,每个重复50只仔鸡,公母各半.无抗生素对照组饲喂基础日粮,抗生素组饲粮在基础日粮中添加抗生素(恩拉霉素10 g/t,硫酸抗敌素20 g/t),试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组饲粮分别在基础日粮中添加100、150、200和250 g/t OS.试验期为42 d.结果显示:与对照组相比,饲料中添加200和150 g/t OS对肉鸡的增重、饲料转化率有改善作用,并能降低肉鸡的死亡率(P＜0.05),同时可显著提高肉鸡的屠宰率、半净膛率、全净堂率、胸肌率和腿肌率,有效降低腹脂率,改善肌肉品质(P＜0.05).     

生肌玉红膏联合封闭负压引流术对糖尿病足患者溃疡创面血管新生及氧化应激指标的影响

目的 探讨生肌玉红膏联合封闭负压引流术（racuum sealing drainage,VSD）对糖尿病足溃疡创面血管新生及氧化应激指标的影响。方法 选取70例糖尿病足溃疡患者随机分为两组,每组35例。所有患者均给予常规清创处理及VSD,观察组加用生肌玉红膏联合负压引流术治疗。观察比较两组患者治疗后创面愈合时间、创面愈合率、踝肱指数变化情况;评价创面血管内皮生长因子（vascular endothelial growth factor,VEGF）、碱性成纤维生长因子（basic fibroblast growth factor,bFGF）、内皮抑素（endostatin,ES）表达情况及超氧化物歧化酶（superoxide dismutase,SOD）、丙二醛（malondialdehyde,MDA）、晚期蛋白氧化产物（advanced oxidation protein products,AOPP）等氧化应激指标。结果 与对照组相比,治疗后观察组患者创面愈合时间缩短,创面愈合率及踝肱指数升高,差异均有统计学意义（P<0.05）;观察组创面VEGF、bFGF表达的平均吸光度值高于对照组（P<0.05）,创面ES的水平明显低于对照组（P<0.05）;观察组SOD水平高于对照组,MDA、AOPP水平低于对照组（P<0.05）。1年随访发现对照组患者溃疡复发率高于观察组（P<0.05）,但两组患者的截肢率及病死率差异无统计学意义（P>0.05）。结论 生肌玉红膏联合VSD可以缩短糖尿病足溃疡创面愈合时间,促进创面的修复,其作用机制可能与调节VEGF、bFGF、ES、SOD、MDA、AOPP等因子表达,促进溃疡创面血管新生,改善机体氧化应激有关。