库车坳陷克深地区现今地应力场及储层裂缝数值模拟

克深三维区目前处于勘探开发的前期,需要明确地应力场及地下储层裂缝的分布规律,指导开发工作,但该区存在地层埋深大、取心困难、成像测井资料缺乏等实际情况,应力场研究及裂缝预测难度大。利用有限元分析方法,以井点现今地应力值为约束进行了克深三维区现今地应力场的数值模拟,同时建立了应力应变与裂缝参数的定量关系模型,利用古今应力场结合法对克深三维区的裂缝参数进行了预测,模拟结果显示构造高部位和断层带是低应力值区及裂缝的有利发育区。裂缝的数值模拟结果与测井解释结果对比表明,预测结果与实钻吻合度较高,裂缝预测效果较好。     

类器官的研究进展及应用前景

类器官（organoids）来源于自组织和自我更新的干细胞，是利用干细胞的自组织特性进行体外3D培养后形成的细胞团，与来源器官密切相关，再现了来源器官的三维细胞结构，并为探索来源器官的发病机制提供了新的模型。类器官系统是由自分泌、旁分泌或邻分泌信号调节下的细胞，或者外源性添加的细胞外基质（extracellular matrix，ECM）底物、小分子和生长因子等衍生而来，这些因素的相互作用创造了一个动态的环境，指导干细胞的自我更新和分化，以及细胞在类器官中的自我组装。诱导多能干细胞（induced pluripotent stem cells，iPSC）重编程方法结合3D类器官工具，使患者来源的类器官作为动物模型和人类临床试验之间的桥梁，是对细胞研究和在体试验的补充。在研究来源器官发育、生物学和病理生理学方面，类器官不仅是一种比传统细胞培养更具生理相关性的体外模型，而且还是再生医学和个性化医学领域中的新模型，有望成为研究营养素、药物、毒物及毒素等的作用机制及药物的筛选、再生医学等领域的重要模型。总之，类器官技术的发展增强了人们对器官和组织生理生化功能的认知。作者对肠、脑、肺脏、肝脏、子宫、卵巢等类器官培养和应用的研究进展进行综述，以期为类器官相关科研及应用提供参考。     

基于FLAC^3D的某碎石土边坡地震反应分析

基于完全非线性的动力分析方法,利用FLAC3D软件对西南某碎石土边坡在地震下的稳定性进行分析。分析表明：地震作用下,边坡坡面的水平向永久位移最大,并由坡面向坡内逐渐减小;边坡的加速度时程与场地输入的PGA相比均有一定程度的放大;在边坡上随着高程的增加,水平方向向坡外的位移大小变化受边坡结构面的控制影响较大。研究结果有助于进一步探讨复杂边坡地震下的失稳机制。     

不同剂量25羟基维生素D3对断奶前犊牛血液生化指标、抗氧化能力和免疫功能的影响

为研究不同剂量25羟基维生素D₃[25(OH)VD₃]对断奶前犊牛血液水平、抗氧化能力和免疫功能的影响,选取18 头健康状况良好的新生荷斯坦犊牛,随机分成3 组,每组6 头进行为期56 天的饲养试验。分为对照组[不添加25(OH)VD₃]、低剂量组[25(OH)VD₃添加量6 000 IU/头·天]和高剂量组[25(OH)VD₃添加量12 000 IU/头·天]。结果表明,与对照组相比,随着25(OH)VD₃添加剂量增加,血浆生长激素、胰岛素样生长因子-1、过氧化氢酶、超氧化物歧化酶、总抗氧化能力以及免疫球蛋白G(IgG)含量显著增加(P<0.05),而丙二醛含量随剂量增加而存在降低趋势(P=0.079)。与对照组和低剂量组相比,高剂量组血浆免疫球蛋白A(IgA)含量有增加趋势(P=0.059)。综上所述,断奶前犊牛饲喂高剂量25(OH)VD₃有利于促进体内生长激素和胰岛素样生长因子-1分泌,可提高犊牛抗氧化能力,增强免疫功能。     

Development of Nucleic Acid Lateral Flow Immunoassay Detection Method for Foot-and-mouth Disease Virus

In this article, through the combination of nucleic acid probes and immune chromatography, a simple, sensitive and specific detection system——nucleic acid lateral flow immunoassay (NALFIA) for amplifing foot-and-mouth disease virus (FMDV) 3D RT-PCR products was established.An ultrasensitive nucleic acid biosensor (NAB) based on streptavidin-labeled gold nanoparticles dual labels and lateral flow strip biosensor (LFSB) were used in this system.The biotinylated goat anti-rabbit IgG was marked to the NC membrane as the alleged strip and the anti-digoxin antibody was labeled to the NC membrane to capture the digoxin probe.After assemblying gold-labeled strip and detecting RT-PCR products, the detection limit of NALFIA was 0.3×10^-3 to 3×10^-3 μg/μL.The NALFIA was compared with agar gel electrophoresis analysis, the results showed that the sensitivity of NALFIA was higher than agar gel electrophoresis.There was an excellent agreement between the two methods.NALFIA was a method with high sensitive, low cost and short time.In conclusion, this method provided a good alternative to detect FMDV.     

利用QuantStudioTM 3D数字PCR分析转基因玉米MON863含量

QuantStudioTM 3D数字PCR (QuantStudioTM 3D digital PCR,3D-dPCR)是一种基于超高密度亲疏水微孔芯片实现数字PCR分液原理的新型核酸绝对定量平台,在转基因生物定量领域具有极大的应用前景.本研究基于3D-dPCR平台,以转基因玉米(Zea mays)MON863混合样品为例,建立基于单重和双重数字PCR体系的转基因生物(genetically modified organisms,GMOs)含量分析方法.与传统qRT-PCR比较发现,在缺乏样品纯度、纯合度信息的情况下,数字PCR能够较好地排除这些因素的影响,测定准确的量值.研究结果表明,QuantStudioTM 3D数字PCR是一种适用于转基因生物含量分析的精确定量方法,还可反映转基因玉米种子的基因型.本研究基于3D-dPCR建立的转基因玉米MON863单重和双重定量方法为转基因检测提供了新的方法和参考.     

三维可视化平台下建模分析以及数据的交换——以广州大学为例

使用了三维GIS技术对区域建筑进行虚拟,首先采用ArcGIS to SketchUP6Plugin插件将具有空间参考坐标的广州大学建筑楼的地理数据导入SketchUP,在其中建立带有贴图的精细的广州大学建筑三维模型,最后将三维模型导回Arcscene中进行三维显示及分析。     

基于Unity3d的桂林七星公园全景导航系统

信息可视化技术的使用已经在生活中获得广泛的使用,并且已经在用户中获得了广泛的使用,而将信息可视化技术与三维建模技术结合是近几年来一个新的突破点。本文将介绍如何基于桂林七星公园数字化,并且如何移植到相关移动平台上。该系统主要基于Unity3d平台搭建,结合3dsmax建模技术和使用Ecplips作为开发环境开发的Android技术建立一个方便用户快捷、高速的可视化旅游景区的全景导航系统。     

Abnormal bone mineralization in a puppy fed an imbalanced raw meat homemade diet diagnosed and monitored using dual-energy X-ray absorptiometry

A 4-month-old male Old English Sheepdog was presented for evaluation of a raw meat-based homemade diet after a 1-month history of progressive lameness. Marked dietary deficiencies were detected, which included calcium, phosphorus and vitamin D. Hypovitaminosis D and hypocalcaemia were diagnosed by serum analysis. Evidence of severe diffuse osteopenia was noted on survey radiographs. Dual-energy X-ray absorptiometry (DEXA) was used to quantify bone mineral content and density and compare to published reference ranges. The puppy's initial bone mineralization was markedly subnormal, with bone mineral density 66% lower than expected, and bone mineral content 40% lower than expected. Subsequent DEXA scans were performed at intervals during the puppy's recovery to document the rate of bone re-mineralization and guide therapeutic recommendations. Marked improvement was achieved within 4 months through exercise control and feeding of a diet appropriately formulated for large breed puppy growth and development. This report reinforces the necessity of thorough dietary history and highlights the potential for malnutrition in pets fed homemade and raw meat-based diets. Use of DEXA has rarely been reported in clinical cases, yet can be a valuable tool for diagnosing and monitoring cases with abnormal bone mineralization. Further studies using DEXA to track bone mineralization in healthy puppies are encouraged to develop a more robust reference range of bone mineralization in growing dogs of varying sizes, weights and ages.