虚拟现实技术在多媒体课件开发中的应用

目前虚拟现实技术在高校教学多媒体课件开发过程中应用较为广泛,在分析虚拟现实技术及其在课件开发中的应用优势的基础上,针对虚拟现实技术在多媒体课件开发中的具体应用展开了相关论述,以期实现更深层次发展。     

大兴安岭火烧迹地主要目的树种的天然更新

对不同火烧方式、火烧强度、林分组成、坡向、坡位、郁闭度、土壤厚度、下木盖度、地被物盖度、林龄等条件下的样地的天然更新情况进行了调查。结果表明:地表火火烧迹地的天然更新效果好于树冠火火烧迹地;中度火烧迹地好于重度火烧迹地;发生火烧的林分比未发生火烧的林分天然更新效果好。     

玉米新品种抗旱性品比试验

玉米是毕节地区最重要的粮食作物,年均播种面积占粮食总播种面积的35%,产量占粮食总产的40%以上,玉米的丰欠在全区粮食总产中起着举足轻重的作用。近年来,随着科技兴农进程的推进,杂交品种及其配套技术得到广泛的应用,玉米产量不断提高。但在一些地区历年春、伏旱极为严重,人畜     

Cellular Localization of Rice SUMO/SUMO Conjugates and in vitro Sumoylation Using Rice Components

正Many proteins are regulated by post-translational modifications,such as the reversible covalent attachment of ubiquitin and ubiquitin-like proteins in eukaryotes(Kerscher et al, 2006). Post-translational modification of proteins by the SUMO protein family is involved in diverse cellular processes, including development, hormonal responses, and biotic and abiotic stress signaling(Park et al, 2011). SUMO modification can modulate protein-protein interactions, intracellular localization or the activities of the protein(Gareau and Lima, 2010).     

Evaluation on the fitness and population projection of Nilaparvata lugens in response to elevated CO2 using two-sex life table

Abstract

The life history and fitness of Nilaparvata lugens being reared under ambient level (current CO₂ concentration), medially elevated (550?µL/L) and highly elevated (750?µL/L) CO₂ concentration for long-term generation were compared using two-sex life table instead of traditional age-specific life table. The results showed that significantly longer larval duration and lower fecundity of N. lugens were observed in 750?µL/L relative to 550?µL/L treatment (P?<?0.05). Accordingly, 550?µL/L CO₂ significantly enhanced population parameters of N. lugens, including significantly higher intrinsic rate of increase (r), finite rate (λ) and net reproductive rate (R_O), but not for 750?µL/L CO₂. Taken together, N. lugens performs enhanced development rate, fecundity and survival in individual life history and higher potential in population multiplication under 550?µL/L CO₂ level, while only indicates the less enhanced development rate and survival without significant increased capacity of population expansion under 750?µL/L CO₂ level. These results should facilitate predicting the fitness and potential population damage of N. lugens, which is valuable for the integrated control of N. lugens in the future increasing CO₂ concentration.     

Streptomyces TOR3209介导盐碱地金花葵根际的生态效应

为研究植物微生物联合改良盐碱地的效果和根际效应,以耐盐植物金花葵(Hibiseu manihot L.)和根际益生菌链霉菌Streptomyces TOR3209为材料,采用磷脂脂肪酸(PLFAs)生物标记法和生物多样性指数测度法,在始蕾期和成熟期,检测了TOR3209+金花葵(T1)、金花葵(T2)和裸地原土(空白CK)根际微生物总量和主要菌群结构的变化,同时检测了根围土壤主要酶活性和理化性状的变化。结果表明:T2处理能显著提高土壤磷脂脂肪酸(Phospholipid-derived fatty acids, PLFA)含量和多样性,改善微生物群落结构,但G+/G-值高于CK,土壤却转向贫瘠。T1处理的金花葵生长旺盛,全株生物量提高了113.22%;在2个生长期,碱解氮、速效磷、速效钾含量也有显著提高,根围土壤电导率和pH值均下降;土壤蔗糖酶、脲酶和碱性磷酸酶活性均有所提高;微生物总量提高,土壤微生物Shannon多样性指数、Simpson优势度指数和Margalef丰富度指数显著改善,细菌、放线菌、细菌/真菌和AM真菌总量等提高;且G+/G-值低于CK,土壤由贫瘠转向丰富。T1处理土壤理化性质和生物学指标均更优于T2处理。冗余分析(RDA)表明,土壤微生物与碱解氮、速效磷、有机质呈正相关,与pH和电导率呈负相关,是影响根际微环境的重要因子。链霉菌TOR3209与根系互作,通过改善根际微环境,显著提高了植株的耐盐能力和生产性能。植物微生物联合改良盐碱地具有良好前景。     

沉淀法制备的紫杉醇白蛋白微粒包封率测定

采用沉淀法制备紫杉醇白蛋白微粒,采用高效液相色谱法(HPLC)测定紫杉醇质量浓度,以二氯甲烷为有机相,采用萃取法分离白蛋白微粒与游离药物,测定其包封率。结果表明:紫杉醇在10~100 mg·L-1范围内线性良好,平均回收率可达到97.6%~101.0%;有机溶剂萃取法测定紫杉醇白蛋白微粒包封率的平均回收率,达94.80%~101.67%。这种方法测定紫杉醇白蛋白微粒回收率准确可靠,适用于沉淀法制备的白蛋白微粒的包封率测定。     

构建天空地一体化的农村人居环境监测体系研究

【目的】农村人居环境整治是实现乡村振兴战略的重要任务,对整治工作取得的成果 进行有效监测和监督日益迫切,这事关农村人居环境整治工作的成效。【方法】文章通过文 献梳理,整理了我国农村人居环境整治工作所取得的进展,结合调查研究及工作中汇聚的 时空数据资源,提出构建天空地一体化的农村人居环境大数据监测平台的思路,将对农村 人居环境整治成果进行有效的监督和核查。【结果】该文提出了构建农村人居环境数据资源 库、农村人居环境监测系统、农村人居环境举报核查系统、农村人居环境整治评估系统的建 设思路,从而形成天空地一体化的农村人居环境大数据监测平台,将为做好农村人居环境监 测体系建设提供支撑。【结论】利用基于遥感、大数据、人工智能等现代信息技术手段,构 建天空地一体化的农村人居环境大数据监测平台,对农村人居环境整治成效进行有效监督和 核查,实现整治效果全过程的在线监管,充分发挥信息化助力农村人居环境整治工作的独特 作用。