跨库检索系统的实施与研究

本文借鉴元搜索引擎的原理，采用web检索的方式，建立了一个基于java技术的可跨平台的跨库检索系统模型，并就其设计思想、系统结构和实现要点进行了详细介绍。能满足用户对数据库跨库检索和并发检索的需要。通过它能同时检索到多个数据库中的内容。弥补目前大多数搜索引擎达不到的功能。     

免疫抗毒散的毒性试验

免疫抗毒散为纯中药制剂,经动物试验,其对20日龄罗曼母鸡的最大耐受量在35g/lg体质量以上,灌胃最大耐受量为32g/kg体质量,20%免疫抗毒散小白鼠腹腔LD50=0.3mL/20g体质量,LD50的95%的可信限为0.240～0.376 mL/20g体质量;以20%的浓度给小白鼠和雏鸡连续饮水20d,用药期间小白鼠和雏鸡的精神、食欲、生长发育均正常,剖解时组织器官无任何形态学变化;给孕鼠饮水20d,产仔数和仔鼠的发育与对照组无差异,表明使用免疫抗毒散非常安全。     

关于国内对乔治·奥威尔研究的述评——以20世纪50～90年代的研究为据

乔治·奥威尔是具有世界影响力的经典作家。在2013年奥威尔诞辰110周年来临之际,文章对20世纪50年代到90年代这50年的国内奥威尔研究学术史进行较为详细的梳理,同时指出不同时期奥威尔研究的主要特征,以期在厘清学术史的基础之上进一步提高国内奥威尔研究的质量。     

赵姨娘与马道婆的欠契银额真伪辨析--兼论编印《红楼梦》优质版本的重要性

"魇魔法"是<红楼梦>中的大事件,其间,赵姨娘与马道婆合谋戕害王熙凤、贾宝玉所写欠契在两套通行本中分别为五十两和五百两,两种差异甚巨的银额定有真伪之分.综合衡定,特别是依据赵姨娘为人处事的性格特征论析,五十两方合曹雪芹的原意.类似的舛误在现行诸版本中不胜枚举.由此而论,应由国家组织,甄别各家优长,整理出版一套公认的权威版本,势在必行,以不负新国学的盛名.     

优秀男子50km竞走运动员扎西杨本在2019年全国竞走冠军赛的技术特点分析

扎西杨本是我国优秀竞走运动员,对其技术特点进行分析,找到薄弱环节,并提出针对性的建议。主要通过影像解析法分析扎西杨本的技术特点,发现扎西杨本步长偏小,倾向于缩小动作幅度来完成加速,常速状态下竞走技术较为合理,低速状态下技术舒展。着地技术佳,腾空时间符合竞走技术规范,后蹬力量有所不足,左右腿力量不均衡,加速时有前趴,核心力量需要加强。扎西杨本应该在后期的训练中注重髋关节的柔韧和力量,更好的体会向前"送髋"的技术,且平衡左右腿的力量。     

Approximate controllability of nonlinear stochastic evolution systems with time-varying delays

In this paper, the approximate controllability of nonlinear stochastic evolution time-varying delay systems with preassigned responses is studied. The necessary conditions for controllability results of nonlinear systems are not associated with linear systems. No compactness assumptions are imposed in the main results.     

2011田径世锦赛男子50km竞走前8名选手战术特征分析

运用文献资料、调查、录像解析及数理统计等方法,对参加2011年田径世锦赛男子50km竞走项目前八名参赛选手的分段成绩和分段比赛速度趋势进行分析。结果表明:男子50km竞走比赛的运动员在比赛中的速度变化形式有"前快后慢"、"波浪起伏"以及"全程匀速";世锦赛50km竞走前8名运动员速度的整体特征,基本上是以较慢的速度开始匀加速,至30km-40km,达到最大速度,最后10km速度开始下降;竞走战术安排对50km竞走比赛成绩具有重要影响。男子50km竞走的运动员主要采用"跟随走"和"领先走"的战术安排。     

非平衡双轴失配应变对BST薄膜相图的影响

用朗道———德文希尔理论研究了非平衡双轴失配应变对单畴外延钛酸锶钡(BST)薄膜相变的影响,得到了室温下生长在四方基底上的BST50/50薄膜的“失配应变—失配应变”相图和能量图。结果表明在BST50/50薄膜中由于非平衡双轴失配应变的作用,出现了两个在平面内的四方铁电相,即:a1相(P1≠0,P2=P3=0)和a2相(P2≠0,P1=P3=0),而这在平衡失配应变下是不存在的。室温下,非平衡失配应变在一定范围内不能使BST50/50中的顺电相消失。     

Production of carotenoid sarcinaxanthin by Kocuria palustris isolated from Northeastern Brazil Caatinga soil and their antioxidant and photoprotective activities

BackgroundThis study aimed to produce carotenoids of two bacterial strains obtained and isolated from Caatinga soil in Northeastern Brazil and to evaluate their antioxidant and photoprotective activities. The morphological identification of bacteria was performed by Gram staining and molecularly confirmed through the 16S rRNA gene. The production of carotenoids was performed on two 2³ factorial designs to analyze the influence of independent variables (temperature range, luminosity, agitation, spiral presence, and bacterial isolate type) for maximum carotenoid yield. The selected condition has been transferred to a bioreactor (10L). The identification of carotenoids was performed by liquid chromatography (HPLC) and mass spectrometry (LC-MS). Antioxidant activity was determined by inhibiting the β-carotene/linoleic acid system and the effectiveness as sunscreen was measured through its sun protection factor (SPF).ResultsThe results revealed that the isolates FT-7.22 and FT-5.12 were identified as Kocuria palustris; producers of a rare C50 carotenoid sarcinaxanthin. This is the first report on the production of carotenoids by this species from the Caatinga Domain. The pigment that was obtained from the Tryptic Soy Broth (TSB) medium in the best conditions of the factorial designs (increased agitation, aeration, and light exposure) exhibited a significant increase in the carotenoid production. The isolated FT-7.22 reached a higher sarcinaxanthin concentration (112,480 μg/L), and it exhibited promising antioxidant (76.53 ± 0.09%) and photoprotective activities (SPF = 9.36 ± 0.52).ConclusionsThis study demonstrated the ability of K. palustris to produce carotenoid sarcinaxanthin with antioxidant and photoprotective activities so that it can be applied in cosmetic formulations.How to cite: Mendes-Silva TCD, Vidal EE, de Souza RFR, et al. Production of carotenoid sarcinaxanthin by Kocuria palustris isolated from Northeastern Brazil Caatinga soil and their antioxidant and photoprotective activities. Electron J Biotechnol 2021;53. https://doi.org/10.1016/j.ejbt.2021.05.004     

风华五十载 盛世谱新篇——纪念大连教育学院建院50周年

世纪风来满眼春 ,五十征程铸辉煌。正值大连教育学院建院 5 0周年之际 ,回顾大连教育学院 5 0年来的发展历程 ,展望学院发展面临的新形势 ,进而提出了今后学院发展的战略思考