有源负载恒温槽性能分析

本文阐述了有源负载恒温槽的工作原理，推导了描述其静态特性的缩减因数表达式，并对这种恒温槽的性能和应用作出了评价。     

番茄果实采后一氧化氮处理对活性氧代谢的影响

 以番茄品种‘百利’为试材, 研究了NO处理对其采后活性氧代谢的影响。结果表明: NO处理可推迟果实呼吸和乙烯高峰的出现, 抑制O·₂ 和H₂O₂ 的累积, 保持了贮藏后期SOD、CAT、POD、APX 较高的活性以及GSH和AsA含量的较高水平, 延缓了MDA含量和膜相对透性的升高, 降低膜脂过氧化程度, 延缓了果实衰老。     

Functional Analysis of ABC Transporter Genes From Botrytis cinerea Identifies BcatrB as a Transporter of Eugenol

The role of multiple ATP-binding cassette (ABC) and major facilitator superfamily (MFS) transporter genes from the plant pathogenic fungus Botrytis cinerea in protection against natural fungitoxic compounds was studied by expression analysis and phenotyping of gene-replacement mutants. The expression of 11 ABC (BcatrA–BcatrK) and three MFS genes (Bcmfs1, Bcmfs2 and Bcmfs4) was studied. All genes showed a low basal level of expression, but were differentially induced by treatment with cycloheximide and the plant defence compounds camptothecin, eugenol, psoralen, resveratrol and rishitin. The latter compounds induced expression of BcatrB at a high level. Eugenol was more toxic to BcatrB gene-replacement mutants than to the control isolates. Eugenol also caused an instantaneous increase in mycelial accumulation of the fungicide fludioxonil, a known substrate of BcatrB. However, there was no difference in virulence between the wild-type and BcatrB gene-replacement mutants on Ocimum basilicum, a plant known to contain eugenol. The results indicate that BcatrB is a transporter of lipophilic compounds, such as eugenol, but its role in virulence remains uncertain.     

冰核细菌对仁用杏胚珠超微结构的影响

 应用透射电镜对两个仁用杏品种‘白玉扁’和‘一窝蜂’接种冰核细菌并低温处理后的胚珠超微结构进行了观察, 发现冰核细菌对胚珠的超微结构有一定影响: (1) 使珠心细胞发生严重的质壁分离,细胞质中存在大量泡状结构, 线粒体的内部结构完全被破坏, 呈透明状, 而且有些珠心细胞中形成同心圆状的多膜内含物; (2) 使胚囊中卵细胞的细胞核外膜膨胀, 甚至核膜局部解体, 细胞质中细胞器减少。这些变化致使胚珠发育不正常, 影响受精而导致减产或绝收。接种冰核细菌并低温处理比单纯低温处理对胚珠超微结构的破坏程度重。     

酸奶营养品质提升的加工工艺研究

牛奶中含有丰富的活性营养物质,包括乳铁蛋白、免疫球蛋白、乳过氧化物酶、α-乳白蛋白、β-乳球蛋白等。传统工艺生产的酸奶经过高温杀菌,活性营养物质几乎完全损失。为了避免这一情况,本文推出一种新的酸奶生产工艺,生产出的酸奶可保留大部分活性营养物质。首先将牛奶的乳脂进行分离,乳脂部分进行125 ℃、5 s杀菌,脱脂牛奶部分进行75 ℃、15 s杀菌,将两部分料液混合后加入菌种发酵至酸度75~85°T,破乳后冷却后熟8 h以上。经测定,新工艺酸奶中α-乳白蛋白、β-乳球蛋白、乳铁蛋白、免疫球蛋白、乳过氧化物酶含量分别为966 mg/L、1 963 mg/L、23.4 mg/L、102 mg/L、1 025 U/L,远高于传统工艺酸奶的68 mg/L、200 mg/L、0.7 mg/L、14 mg/L、0 U/L。通过对比新工艺与传统工艺酸奶保质期内的活菌数、黏度、酸度和口感,并无显著差异。     

果蔬籽油生物活性研究进展

果蔬籽油是由果蔬籽经压榨或萃取工艺制得的植物油脂。果蔬籽油含有丰富的维生素、多不饱和脂肪酸、有机酸等活性成分,这些成分赋予了果蔬籽油抗氧化、抗癌、调节血脂和调节免疫系统等生物活性。本文综述了果蔬籽油生物活性的研究进展,旨在为果蔬籽油的综合开发和利用提供理论依据和指导。     

Establishment and Optimization of INH Epitope Peptide Vaccine for Detection of Antibody

In this study, an indirect ELISA method was established to detect inhibin hormone (INH) epitope peptide vaccine antibody, it would provide oretical reference for the determination of Fine-wool sheep after active immune body INH epitope peptide vaccine antibody. On the basis of the predecessors, using indirect ELISA method to determinate serum INH epitope peptide antibody levels of sheep, and through control different experimental conditions to look for the best experimental conditions. Through explorating the experimental conditions, finally, the testing experiment conditions were determined, which was blocked solution with skimmed milk powder, INH and GnIH synthetic peptides dilution degrees for 20 000 times, the optimum reaction time was 60 min, the best color action time was 15 min. In this experiment, a kind of method to detection antibody in the body after INH active immune sheep was built, it would provide a reference for future research.     

日粮大豆活性肽对仔猪生长和相关理化指标及抗氧化性能的影响

为了探讨大豆活性肽对仔猪生长性能、血液指标及氧化应激参数的影响,试验选取仔猪48头,随机分为2组,每组设3个重复,每重复8头。对照组饲喂基础日粮,试验组饲喂用大豆活性肽替代2%豆粕的日粮。结果:添加2%大豆活性肽,20 d时,显著提高了仔猪粗脂肪、粗蛋白的消化率(P<0.05);血清总蛋白(TP)、血清白蛋白(ALB)和碱性磷酸酶(ALP)水平略高于对照组;50 d时,大豆活性肽显著提高了仔猪干物质、粗灰分、粗脂肪、粗蛋白、粗纤维的消化率(P<0.05),而且总抗氧化能力(T-AOC)、超氧化物歧化酶(SOD)活性及TP水平显著高于对照组(P<0.05);全程试验组日增重均显著的高于对照组,料重比、腹泻率显著低于对照组(P<0.05),然而对尿素氮(BUN)和甘油三脂(TG)影响不明显。     

1株降解黄曲霉毒素B1的解淀粉芽胞杆菌的分离鉴定及其体外脱毒效果

旨在筛选出能够高效降解黄曲霉毒素B₁（AFB₁）的菌株,并对其脱毒活性组分的脱毒效果进行研究,本研究以香豆素为唯一碳源对目标细菌进行初筛,以对AFB₁的降解率为指标进行复筛,并从形态学、生理生化试验和16S rDNA序列分析对筛选菌株进行鉴定;通过测定该菌株不同发酵组分对AFB₁的降解率,来定位其脱毒活性组分,同时采用CCK-8法测定活性组分降解AFB₁后对LMH细胞毒性,并研究了热处理、紫外线照射、强酸、强碱及蛋白酶K处理对活性组分脱毒作用的影响。结果显示,从样品中初筛分离到24株能够在初筛培养基生长良好的菌株,经复筛从中筛选到一株能高效降解AFB₁的菌株Y1-B1,其AFB₁降解率达到73.2%;经形态学、生理生化试验和16S rDNA序列分析确定该菌为解淀粉芽胞杆菌（Bacillus amyloliquefaciens）。对菌株Y1-B1培养物的不同组分进行的脱毒活性研究表明,不同组分对AFB₁的降解率不同,上清液的脱毒能力最强,细菌细胞裂解物的脱毒能力下降明显,菌体悬液和菌体裂解物上清的脱毒能力最差,由此确定解淀粉芽胞杆菌Y1-B1的脱毒能力主要来源于上清液中的某种活性物质;细胞毒性结果显示,与AFB₁对LMH细胞的毒性作用相比,AFB₁被上清液降解后其产物的毒性显著降低。该脱毒活性组分对不同理化因素处理呈现出不同的表现,对高温、紫外照射抵抗力较强,对强酸、强碱抵抗力较差,蛋白酶K仅造成脱毒能力部分减弱。本研究将为解决黄曲霉毒素污染问题提供新的微生物种质资源,同时为后续微生物脱毒制剂的开发奠定基础。     

Research on Dynamics of Installation Way for Active Isolation Actuator on Flexible Foundations

The dynamic characteristic of active isolation atuator on flexible foundations was studied under the installation of parallel structure and foundation cancellation.The influencing relationships between active isolation force of the different installation ways and passive isolation system and flexible foundation were analyzed and compared.Scientific basis for selecting installation ways of active isolator is provided in this paper.