Assessing fire severity in Turkey's forest ecosystems using spectral indices from satellite imagesOA

Fire severity classifications determine fire damage and regeneration potential in post-fire areas for effective implementation of restoration applications.Since fire damage varies according to vegetation and fire characteristics,regional assessment of fire severity is crucial.The objectives of this study were:(1) to test the performance of different satellite imagery and spectral indices,and two field—measured severity indices,CBI(Composite Burn Index) and GeoCBI(Geometrically structured Composi...     

磷营养对水稻籽粒锌生物有效性的影响及其与植酸等磷酸肌醇谱含量的关系

作物籽粒锌缺乏所导致的“隐性饥饿”已威胁到全世界1/3人群的健康。为明确磷对水稻籽粒锌的生物有效性的影响,利用大田磷肥长期定位试验,并结合稻穗离体培养技术,探讨了不同外源磷浓度下水稻籽粒锌的生物有效性的变化及其与籽粒植酸等磷酸肌醇谱含量的关系。试验表明高磷处理显著增加水稻籽粒中植酸磷和总磷的含量,以及不同价位磷酸肌醇(InsP1-6)含量,其中以高价磷酸肌醇(InsP4-6)在磷供给下的增幅最为显著。与籽粒植酸的变化趋势相反,高磷水平降低了稻米中锌的含量及其有效性。稻穗离体培养中,高磷(P12)处理相比无磷(P0)对照,籽粒锌的有效性降幅高达81.3%。因此,过量磷肥投入会通过显著提高水稻籽粒中的植酸及高价磷酸肌醇含量,在同步降低籽粒锌含量的同时,进一步显著降低其在水稻籽粒中的生物有效性。     

Brain size and urbanization in birds

Background: Brain size may affect the probability of invasion of urban habitats if a relatively larger brain entails superior ability to adapt to novel environments. However, once urbanized urban environments may provide poor quality food that has negative consequences for normal brain development resulting in an excess of individuals with small brains.Methods: Here we analyze the independent effects of mean, standard deviation and skewness in brain mass for invasion of urban habitats by 108 species of birds using phylogenetic multiple regression analyses weighted by sample size.Results: There was no significant difference in mean brain mass between urbanized and non-urbanized species or between urban and rural populations of the same species, and mean brain mass was not significantly correlated with time since urbanization. Bird species that became urbanized had a greater standard deviation in brain mass than non-urbanized species, and the standard deviation in brain mass increased with time since urbanization. Brain mass was significantly left skewed in species that remained rural, while there was no significant skew in urbanized species. The degree of left skew was greater in urban than in rural populations of the same species, and successfully urbanized species decreased the degree of left skew with time since urbanization. This is consistent with the hypothesis that sub-optimal brain development was more common in rural habitats resulting in disproportionately many individuals with very smal brains.Conclusions: These findings do not support the hypothesis that large brains promote urbanization, but suggest that skewness has played a role in the initial invasion of urban habitats, and that variance and skew in brain mass have increased as species have become urbanized.     

犬瘟热病毒H、F和N基因的克隆及原核表达

正犬瘟热病毒(Canine distemper virus,CDV)为负链RNA病毒,属于副黏病毒科麻疹病毒属,可引起犬科、鼬科和浣熊科动物的急性、高度接触性、致死性疾病,该病的主要传染源为患病动物和隐性感染的带毒动物。目前,犬瘟热常年发生,呈散发、地方流行,传染性强、发病率和死亡率高,是养犬业、经济动物养殖和     

沃农丹微量元素水溶肥料在温室黄瓜上的应用试验

以常规施肥为对照,探讨沃农丹微量元素水溶肥料在温室黄瓜上的应用效果。试验结果表明:使用沃农丹微量元素水溶肥料对于增加黄瓜株高、瓜条长度、果肉直径、果肉厚度、单瓜质量、单株坐瓜数和产量均有一定的效果;冲施沃农丹微量元素水溶肥料处理667 m2黄瓜产量可达13 706.8 kg,较对照增加产量2 817.7 kg,增产率达到25.9%。     

应用穿心莲治疗绵羊慢性腹泻病的效果

选取60只患慢性腹泻病绵羊作为主要的研究对象,随机划分为对照组(采用常规治疗方法)和试验组各30例(采用穿心莲治疗方法)。对照组和试验组的治疗总体有效率分别为83.3%和96.7%,组间数据对比后发现,试验组的治疗总体有效率显著高于对照组,值得在养羊业中大力推广和应用。     

骆驼重链抗体特异性多抗的制备及鉴定

目的:骆驼血清中除了常规抗体Ig G1,还存在两种天然缺失轻链的重链抗体Ig G2和Ig G3,其具有分子量小、稳定性强等优点,但由于缺乏有效的检测手段,使其研究和应用受到了一定的限制,因此制备针对骆驼重链抗体的多抗将具有一定应用前景。方法:本实验中,我们从骆驼抗凝血中分离骆驼血浆,经过Protein G/A Resin柱子对骆驼3种亚型抗体进行了分离和纯化。利用纯化的骆驼Ig G2对家兔进行3次免疫制备了针对骆驼重链抗体的多克隆抗体,并对其活性进行了鉴定。结果:SDS-PAGE凝胶电泳检测结果显示我们成功分离到了骆驼各亚型抗体。间接ELISA测定多抗效价为1:4 096,再通过间接ELISA和Western-blot方法测定多抗的特异性,结果显示制备的多克隆抗体与牛Ig G以及骆驼Ig G1无交叉反应,而与Ig G3抗体具有交叉反应性。结论:实验结果显示我们成功制备了骆驼重链抗体特异性多克隆抗体,将对骆驼抗体资源的开发、利用及对骆驼疾病的检测和研究提供有力支持。