Aflatoxicosis in rabbits: Effectiveness of Egyptian raw bentonite in prevention or diminution the detrimental effects of naturally aflatoxin contaminated diets

Thirty five females and 15 males of New Zealand White mature rabbits about 6 months of age, were assigned to 1–5 dietary treatments (7 does+3 bucks for each): uncontaminated control diet, naturally aflatoxin contaminated diet without or with 1,2 and 3% bentonite. Rabbit fed with the aflatoxin-diet had a decreased (P<0.01 or 0.05) physical semen characteristics of bucks and a reproductive performance traits of does. The values of conception rate (%), gestation length (days), litter size (n) and litter weights (g) at birth and viability (%) of litters of doe rabbits, fed with the aflatoxin-diet, recorded, respectively: 64.5; 31.0; 4.4; 275.0 and 57.1 versus 85.6; 30.3; 7.9; 508.0; and 100 for those fed with the uncontaminated diet. Addition of bentonite to the aflatoxin contaminated diet improved in general the physical semen characteristics of buck and reproductive performance traits of doe rabbits. The results of the study demonstrate that adding 1% of Egyptian raw bentonite to the naturally aflatoxin contaminated rabbit diets can provide an effective, cheap and safe practical technique for preventing the aflatoxicosis in mature rabbits.     

动物组织中磺胺二甲嘧啶残留ELISA试剂盒研制

采用重氮化法和戊二醛法,将磺胺二甲嘧啶分别与牛血清白蛋白和辣根过氧化物酶偶联制备了免疫原和酶标半抗原,免疫兔获得了特异性抗体,成功建立了相关动物产品中磺胺二甲嘧啶残留ELISA定量检测方法及商品化试剂盒,并对试剂盒的灵敏度、准确度、精密度和稳定性进行了研究。试剂盒检测线性范围为62.5~0.54 ng/mL。在待测样品中各添加500、200、100、50 ng/g SMZ,测试的回收率平均为89.0%~134.8%;试剂盒测定结果与色谱的平均符合率99.8%~126.0%;对比定性测试15份色谱检测为阴性的样品,均未出现假阳性。试剂盒存放在37℃10 d和2~8℃5个月,质量稳定。     

非洲新稻(NERICA)品种在武汉生态条件下的生育期、白叶枯病抗性和稻米品质的初步评价

从非洲水稻研究中心引进了78份非洲新稻品种资源,2009年在武汉大田条件下种植,对生育期、水稻白叶枯抗性和稻米品质进行了初步评价。观察表明,生育期可以分为4个类型:短生育期品种13份,中生育期品种37份,长生育期11份,生育期特长在武汉不能安全抽穗的品种17份。白叶枯抗性鉴定表明,57.7%的品种高抗或抗长江中下游籼稻区的优势白叶枯病菌株ZHE173,76.9%的品种高抗或抗来自云南稻区的菌株YN18,对中国新发现的强致病力菌株FuJ能达到抗级水平的仅有3个品种,而达到中抗水平的有5个品种,凡是对FuJ达到中抗以上的品种,均高抗或抗ZHE173和YN18。对50个品种的米质分析表明,非洲新稻品种的稻米加工品质和粒型品质特别优良。非洲新稻品种资源可以用于改良国内新品种的白叶枯病抗性和稻米加工品质。     

京族药用红树林民族植物学知识及现状

京族是我国唯一的海洋民族,在长期与红树林为伴的生存环境中,积累了丰富的利用红树林植物的民族植物学知识。然而,这些知识至今仍不为外界所知。为掌握京族药用红树林民族植物学知识和现状,该研究采用民族植物学和植物分类学方法,调查京族药用红树林知识中的红树林植物种类,记录其具体药用用途,并分析其生存现状及其中包含的可持续利用红树林植物资源经验。结果表明:共记录到京族药用红树林植物15种隶属于10科,具体药用用途共49种。其中,20种已有报道,29种未见报道;通过京族对红树林药用知识认知程度和依赖程度的调查还表明,京族历史上依赖本民族草医的情形已经基本消失,对红树林医药的依赖性和需求性也在消失。最后,剖析了京族在药用红树林植物选择与采集中的可持续利用经验。该研究结果不仅补充和拓宽了红树林民间药物的利用知识,而且为红树植物资源的管理与可持续利用提供了新视角。     

转抗虫基因三倍体毛白杨植株体内农杆菌残存与逃逸

用部分改造的 BtCry1Ac基因与慈菇蛋白酶抑制剂(API-A)基因构建的双抗虫基因表达载体,通过农杆菌介导法对三倍体毛白杨进行了转化,对转化后植株体内残存农杆菌在继代培养和移栽过程中进行了跟踪检测。结果表明：通过对转化再生植株的分子生物学检测,42个株系中,33个株系为阳性,阳性率达到80％;用Bt毒蛋白抗血清进行ELSA检测结果表明,7个转基因株系都有Bt杀虫蛋白表达;基因转化后,可采用附加50 mg/L卡那霉素,300 mg/L羧青霉素的筛选培养基消除细菌并进行抗性芽筛选。对28个转基因株系叶片、茎段和根段在含有卡那霉素50 mg/L YEB培养基上进行细菌培养,通过在T-DNA区、质粒Vir区和农杆菌基因组设计引物,进行PCR检测,证明有3个株系（33、37、5号）检测到残存工程农杆菌,并在组培瓶中存活24个月。将带菌的3个株系组培苗移栽到花盆中,室内培养1个月后,在33号株系根际土壤中检测到了目的农杆菌。     

Acceptor specificity of the human leukocyte alpha3 fucosyltransferase: role of FucT-VII in the generation of selectin ligands

The alpha3 fucosyltransferase, FucT-VII, is one of the key glycosyltransferases involved in the biosynthesis of the sialyl Lewis X (sLex) antigen on human leukocytes. The sialyl Lewis X antigen (NeuAcalpha(2-3)Galbeta(1-4)[Fucalpha(1-3)]GlcNAc-R) is an essential component of the recruitment of leukocytes to sites of inflammation, mediating the primary interaction between circulating leukocytes and activated endothelium. In order to characterize the enzymatic properties of the leukocyte alpha3 fucosyltransferase FucT-VII, the enzyme has been expressed in Trichoplusia ni insect cells. The enzyme is capable of synthesizing both sLexand sialyl-dimeric-Lexstructures in vitro , from 3'-sialyl-lacNAc and VIM-2 structures, respectively, with only low levels of fucose transfer observed to neutral or 3'-sulfated acceptors. Studies using fucosylated NeuAcalpha(2-3)-(Galbeta(1- 4)GlcNAc)3-Me acceptors demonstrate that FucT-VII is able to synthesize both di-fucosylated and tri-fucosylated structures from mono- fucosylated precursors, but preferentially fucosylates the distal GlcNAc within a polylactosamine chain. Furthermore, the rate of fucosylation of the internal GlcNAc residues is reduced once fucose has been added to the distal GlcNAc. These results indicate that FucT-VII is capable of generating complex selectin ligands, in vitro , however the order of fucose addition to the lactosamine chain affects the rate of selectin ligand synthesis.      

Two new species of caddisflies from East Asia （Trichoptera： Philopotamidae, Psychomyiidae）

A new species of Kisaura Ross （Philopotamidae） from Japan and a new species of Psychomyia Latreille （Psychomyiidae） from Russia are described. Kisaura imparis n. sp. is closest to Kisaura aurascens （Martynov, 1934）, but the lateral processes of tergum X are asymmetrical and the apex of tergum X is different. Psychomyia poltavkaensis n. sp. resembles Psychomyia n. sp., but the shape of tergum IX＋X is more rounded, the apex of the basoventral process of each preanal appendage is unforked, and the inferior appendages are branched.     

Neurotoxic,cytotoxic, apoptotic and antiproliferative effects of some marine algae extracts on the NA2B cell line

Oxidative stress contributes to cancer pathologies and to apoptosis. Marine algae exhibit cytotoxic, antiproliferative and apoptotic effects; their metabolites have been used to treat many types of cancer. We investigated in culture extracts of Petalonia fascia, Jania longifurca and Halimeda tuna to determine their effects on mouse neuroblastoma cell line, NA2B. NA2B cells were treated with algae extracts, and the survival and proliferation of NA2B cells were assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The effects of algae extracts on oxidative stress in NA2B cells also were investigated using nitric oxide synthase (NOS) immunocytochemistry and apoptosis was assessed using terminal deoxynucleotidyl transferase dUTP nick end labeling. We observed significant neurite inhibition with moderate damage by the neurotoxicity-screening test (NST) at IC₅₀ dilutions of the extracts. MTT demonstrated that J. longifurca extracts were more toxic than P. fascia and H. tuna extracts. We found an increase of endothelial and inducible NOS immunostaining for oxidative stress and TUNEL analysis revealed increased apoptosis after application of extract. Our findings suggest that the algae we tested may have potential use for treatment of cancer.     

从云南省蝙蝠脑组织中分离出乙型脑炎病毒

为进一步阐明蝙蝠在保存乙脑病毒中的作用,于1997年7月,在云南省耿马县捕捉蝙蝠64只,取脑组织作病毒分离,从一只金管鼻蝠脑组织中分离出1株病毒,该毒株能引起BHK21细胞病变和乳鼠发病死亡,在pH5.75-7.4时能凝集鸽红血球,经用单克隆抗体血凝抑制和免疫荧光试验鉴定,证明为乙型脑炎病毒。进一步证明蝙蝠在乙型脑炎病毒保存和扩散中具有重要作用。从金管鼻蝠体内分离出乙型脑炎病毒属国内外首次报道。     

FXR激动剂GW4064对裸鼠肝癌细胞移植瘤增殖及血管生成的影响

目的:探讨研究法尼酯x受体(FXR)激动剂GW4064对裸鼠肝癌细胞移植瘤增殖及血管生成的影响。方法:选取人肝癌细胞系Hep G2进行体外培养,将细胞悬液接种于BALB/c裸鼠皮下。裸鼠成瘤后,随机分为两组,分别腹腔注射DMSO和GW4064。一周后,处死动物取肿瘤组织,通过免疫组织化学法检测肿瘤组织中Ki-67和CD31的表达,同时计数肿瘤组织中的微血管密度(CD31-MVD);Western blot法检测其FXR和白介素-8(IL-8)的蛋白表达。结果:与对照组相比,FXR激动剂GW4064处理组的肿瘤组织中FXR的蛋白表达量明显增高,微血管密度CD31-MVD值显著降低,同时Ki-67、IL-8及CD31的表达水平均显著降低。结论:FXR激动剂GW4064能显著增加FXR的表达,抑制裸鼠肝癌细胞移植瘤的增殖及新生血管的形成。