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1.
Lei SJ 《Journal of Zhejiang University. Science. B》2006,7(7):580-585
The effects of ration level and feeding frequency on digestibility in juvenile soft-shelled turtle, Pelodiscus sinensis, were investigated. Four ration levels 1.5%, 2.5%, 4.0% and satiation （6.0% BW/d） were used. Apparent digestibility （AD） of dry matter （DMAD）, protein （PAD） and protein real digestibility （PRD） were significantly affected by ration level, but not by feeding frequency when the ration level was similar. However, the feeding frequency affected the AD, DMAD, PAD and PRD significantly when the turtles were fed to satiation. The relationship between fecal protein content （Y） and protein intake （At） can be expressed as a quadric equation： Y=-0.1742＋0.1476X-0.0003X^2 （r^2=0.876, n=27, F=93.92, P〈0.01）. 相似文献
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为进一步研究延长因子-1（elongationfactor-1α,E-1α）在调控心脏发育和果蝇心脏功能中发挥的作用,制备延长因子-1的抗体．利用生物信息学选择果蝇EF-1α基因抗原亲水区,并设计出特异性引物,PCR扩增出的片段克隆到原核表达pET-28a载体中,转入E．coli中后通过IPTG诱导融合蛋白表达,将His—EF-1α融合蛋白免疫新西兰大白兔制备多克隆抗体,再用WesternBlot检测抗体的效价和特异性．研究结果表明,获得了EF-1α原核表达重组融合蛋白以及高效价的、特异性兔抗EF-1α多克隆抗体．EF-1α多克隆抗体的效价可以达到1比1500,并且有很强的特异性,为后续研究EF-1α基因在心脏发育和心脏功能中的作用奠定了基础． 相似文献
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鳖致病性细菌与病毒的研究 总被引：2，自引：0，他引：2
对鳖致病性细菌与病毒的研究进行评述：包括病原及其所诱发的疾病；当前颇具争议的焦点问题──细菌与病毒哪个是病鳖中主要的致病病原．并在建立致病性细菌与病毒的早期快速诊断方法方面提出一些浅见． 相似文献
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用气相色谱法（GC）分别对中华卵索线虫感染棉铃虫不同时期血淋巴中游离脂肪酸含量变化进行了分析．棉铃虫血淋巴的软脂酸、棕榈油酸、硬脂酸、油酸、亚油酸、亚麻酸等的含量都比其它类型脂肪酸的含量高得多；感染和未感染棉铃虫血淋巴中不饱和脂肪酸的相对百分含量均在80％左右，感染1～3d，感染组血淋巴中的不饱和脂肪酸总量逐渐下降，饱和脂肪酸情况相反；4d后，不饱和脂肪酸总量逐渐上升，而饱和脂肪酸情况又相反．上述研究结果将为研制接近于宿主血淋巴成分的体外培养液，促进中华卵索线虫体外培养获得成功提供了一定的理论依据． 相似文献
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应用Con-A亲和层析方法从两株Den2病毒(New Guinea C株和从中国海南省分离的H-87株)感染的C6/36细胞膜中分离的糖蛋白,发现了一种感染细胞中特有的蛋白质。经SDS-PAGE证明该蛋白分子量约46000D,分析其为Den 2病毒的非结构蛋白NS1。并利用Western blot筛选出针对该蛋白4种单克隆抗体。 相似文献
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An increasing number ofmonopartite begomoviruses are being identified that a satellite molecule (DNAβ) is required to induce typical symptoms in host plants. DNAβ encodes a single gene (termed βCl) encoded in the complementary-sense. We have produced transgenic Nieotiana benthamiana and N. tabaeum plants expressing the βC1 gene of a DNAβ associated with Tomato yellow leaf curl China virus (TYLCCNV), under the control of the Cauliflower mosaic virus 35S promoter. Transgenic plants expressing 13C1 showed severe developmental abnormalities in both species. Microscopic analysis of sections of both transgenic and non-transgenic N. tabaeum leaves showed abnormal outgrowths of transgenic N. tabaeum to be due to disorganizedcell division (hyperplasia) of spongy and palisade parenchyma. Immuno-gold labeling of sections with a polyclonal antibody against the βC1 protein showed that the 13C 1 protein accumulated in the nuclei of cells. The possible biological function of the βC1 1protein was discussed. 相似文献
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目的白细胞介素15（interleukin-15,IL-15）与炎症反应的关系。方法在含兔IL-15全长编码cDNA的质粒上缺失了部份片段．构建成竞争性RT—PCR的竞争子（competitor）。研究炎症反应后IL-15基因的转录情况。结果竞争性RT-PCR结果显示,IL-15与炎症反应密切相关,且脂多糖（LPS）增加了兔子内脏器官（心脏,肺,肾脏,脾脏和肝脏）中IL-15mRNA的表达。结论LPS可以增强IL-15的免疫反应。 相似文献
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李海生 《广东教育学院学报》2005,25(3):74-76
通过水培方法,就环境中不同铜离子水平下茶苗对铜的吸收与累积进行了研究.结果表明:茶苗根、茎中铜含量均随着铜处理浓度的增加而明显增加,而叶中含量影响不大.各处理下铜在茶苗各部位含铜量大小依次为根>茎>叶.从整株植物来看,随着铜处理浓度的增加,铜在根部的积累量增加,在茎和叶的积累量趋于下降.适量的铜有助于茶苗根、茎、叶对磷的吸收,但超过一定限度,则茶苗含磷量下降. 相似文献
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Jing-min Ou Xi-ping Zhang Cheng-jun Wu Di-jiong Wu Ping Yan 《Journal of Zhejiang University. Science. B》2012,13(11):919-931
Objective: To investigate the protective effects and mechanisms of action of dexamethasone and Salvia miltiorrhiza on multiple organs in rats with severe acute pancreatitis (SAP). Methods: The rats were divided into sham-operated, model control, dexamethasone treated, and Salvia miltiorrhiza treated groups. At 3, 6, and 12 h after operation, the mortality rate of different groups, pathological changes, Bcl-2-associated X protein (Bax) and nuclear factor-κB (NF-κB) protein expression levels in multiple organs (the pancreas, liver, kidneys, and lungs), toll-like receptor 4 (TLR-4) protein levels (only in the liver), intercellular adhesion molecule 1 (ICAM-1) protein levels (only in the lung), and terminal deoxynucleotidy transferase mediated deoxyuridine triphosphate (dUTP) nick end labeling (TUNEL) staining expression levels, as well as the serum contents of amylase, glutamate-pyruvate transaminase (GPT), glutamic-oxaloacetic transaminase (GOT), blood urea nitrogen (BUN), and creatinine (CREA) were observed. Results: The mortality rate of the dexamethasone treated group was significantly lower than that of the model control group (P<0.05). The pathological changes in multiple organs in the two treated groups were relieved to different degrees (P<0.05 and P<0.01, respectively), the expression levels of Bax and NF-κB proteins, and apoptotic indexes of multiple organs were reduced (P<0.05 and P<0.01, respectively). The contents of amylase, GPT, GOT, BUN, and CREA in the two treated groups were significantly lower than those in model control groups (P<0.05 and P<0.01, respectively). The expression level of ICAM-1 protein in the lungs (at 3 and 12 h) in the dexamethasone treated group was significantly lower than that in the Salvia miltiorrhiza treated group (P<0.05). The serum contents of CREA (at 12 h) and BUN (at 6 h) of the Salvia miltiorrhiza treated group were significantly lower than those in the dexamethasone treated group (P<0.05). Conclusions: Both dexamethasone and Salvia miltiorrhiza can reduce the inflammatory reaction, regulate apoptosis, and thus protect multiple organs of rats with SAP. 相似文献
10.
Xu-fei Tan Feng Chen Shan-shan Wu Yu Shi Dong-cheng Liu Zhi Chen 《Journal of Zhejiang University. Science. B》2010,11(3):221-226
Objective: To find new protein biomarkers for the detection and evaluation of liver injury and to analyze the relationship between such proteins and disease progression in concanavalin A (Con A)-induced hepatitis. Methods: Twenty-five mice were randomly divided into five groups: an untreated group, a control group injected with phosphate buffered saline (PBS), and groups with Con A-induced hepatitis evaluated at 1, 3 and 6 h. Two-dimensional gel elec-trophoresis (2-DE) and mass spectrometry (MS) were used to identify differences in protein expression among groups. Quantitative real-time polymerase chain reaction (qRT-PCR) was performed to verify the results. Results: In mice with Con A-induced hepatitis, expression levels of four proteins were increased: RIKEN, fructose bisphosphatase 1 (fbp1), ketohexokinase (khk), and Chain A of class pi glutathione S-transferase. Changes in fbp1 and khk were confirmed by qRT-PCR. Conclusion: Levels of two proteins, fbp1 and khk, are cleady up-regulated in mice with Con A-induced hepatitis. 相似文献
11.
当归多糖对酪氨酸酶活性的影响 总被引：3，自引：0，他引：3
对除去脂溶性物质的当归，进行多糖的提取和粗分离，获得当归多糖．运用蘑菇酪氨酸酶多巴速率氧化法测定当归多糖酪氨酸酶活性的抑制效率，结果表明：当归多糖对酪氨酸酶活性具有明显的抑制作用，可作为化妆品的天然美白添加剂． 相似文献
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以含翻译起始密码子ATG的质粒pSⅪⅤⅥ Ⅹ3/4为转移载体,将多角体蛋白及切除部分5′和3′端的乙型肝炎核心抗原(HBcAg)基因同时插入粉纹夜蛾核型多角体病毒(TnNPV)基因组中,构建了形成多角体的重组毒株。该毒株能利用合成—多角体ⅪⅤ串联启动子,表达由截短的HBcAg序列及其上下游多接头与杆状病毒DNA部分序列组成的融合蛋白基因。SDS-聚丙烯酰胺凝胶电泳、Wcstern印迹与免疫电镜观察的结果表明,融合蛋白基因表达产物的分子量约20.5KD,与理论计算值相符,并保留了HBcAg的抗原性,亦能形成典型的HBcAg颗粒。组建含多克隆点及截去两端序列的HBcAg基因转移载体质粒,使编码多肽抗原的寡聚核苷酸易于克隆,以HBcAg融合蛋白方式在杆状病毒载体系统中表达,并能形成HBcAg为蛋白载体的抗原颗粒结构。 相似文献
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东北扁核木是蔷薇科植物，通过对其木材解剖研究，发现其为散孔材，射线组织为异形Ⅱ型，心材具侵填体。 相似文献
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白木香资源的开发利用 总被引：15，自引：2，他引：15
从白木香[Aquilaria sinensis (Lour．)Gilg]生物学特性、化学成分、药理作用、栽培要点、组织培养、虫害防治以及开发利用的价值等几个方面进行了论述，介绍了我国白木香植物资源的状况及研究概况． 相似文献
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通过走访和问卷方式对四川省冬虫夏草主要分布区社区基本情况、居民对草场和冬虫夏草野生资源的保护意识及保护方法的调查,结果表明:冬虫夏草分布区社区生产生活条件较落后、整体经济水平较低、经济收入模式单一、物资较匮乏,对野生动植物资源依赖较强;居民对草原生态系统及冬虫夏草野生环境的保护意识较强,但缺乏科学的保护措施和方法.为此,提出了保护草原生态系统及冬虫夏草野生资源的科学方法和措施. 相似文献
18.
为了在小鼠模型中更深入地研究nulp1蛋白在心脏发育中的功能,采用PCR技术扩增出小鼠nulp1基因的部分编码区并连接入pET-28a表达载体中,之后将重组质粒转入大肠杆菌(E.coli)通过IPTG诱导表达Hisnulp1融合蛋白,对该融合蛋白采用Ni-IDA凝胶柱层析纯化后,免疫新西兰兔制备了多克隆抗体,并用western blotting对抗体进行分析.结果表明,获得了高效价的特异性兔抗nulp1多克隆抗体.这为nulp1功能的进一步研究奠定了基础. 相似文献
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用感染RVHD病兔的肝、脾、肾以及从鸡、兔混养暴发巴氏杆菌病兔体分离的细菌研制的甲醛灭活二联苗，免疫健康易感兔，于免疫后对RVHD强毒攻击第3天保护车达50％（6／12），第5天达100％（15／15），持续保护6个月以上，抗体动态测定与攻毒结果一致；对巴氏杆菌攻击第7、15天的保护率分别达75％（9／12）、91．7％（11／12）．6个月保护车仍达72．2％（13／18）。 相似文献
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绿僵菌是一类广泛应用于生物防治的昆虫病原真菌.研究表明小RNA能够调控基因的表达,其中Argonaute基因在整个小RNA通路中发挥重要的作用.本研究通过RT-PCR的方法从绿僵菌中获得了Argonaute基因的部分功能片段,构建了其重组原核表达载体,将重组载体转化至大肠杆菌进行诱导表达;采用镍柱亲和纯化重组的目的蛋白并通过Western blot技术鉴定.结果发现：通过RT-PCR的方法获得长度约为950bp的基因片段;重组原核表达载体经诱导表达后,SDS-PAGE检测发现分子量约为34kDa的目的蛋白条带;诱导5h后蛋白的表达量最高,采用镍柱亲和层析纯化重组蛋白,经Western blot技术检测,重组蛋白可与His-tag抗体发生特异性反应.该纯化重组蛋白的获得为将来绿僵菌Argonaute蛋白抗体的制备,并进一步通过该抗体获得绿僵菌体内的小RNA及其靶基因提供了基础. 相似文献