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额外添加复合维生素对育肥牛生长性能、屠宰性能和肉品质的影响

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饲料研究 2024年第11期47卷 24-29页

作者：刘宏凯王浩程王佳宁李金发岳春旺孙茂红王少华河北北方学院动物科技学院河北张家口075132

试验旨在探讨饲粮中额外添加不同脂溶性维生素添加剂对育肥肉牛生长性能、屠宰性能和肉品质的影响。试验选取日龄相近、体重(502.87±14.25)kg的健康西门塔尔杂交牛24头,随机分为4组,每组6个重复,每个重复1头牛。对照组饲喂基础饲粮,试... 详细信息

试验旨在探讨饲粮中额外添加不同脂溶性维生素添加剂对育肥肉牛生长性能、屠宰性能和肉品质的影响。试验选取日龄相近、体重(502.87±14.25)kg的健康西门塔尔杂交牛24头,随机分为4组,每组6个重复,每个重复1头牛。对照组饲喂基础饲粮,试验1组添加75 g/(头·d)复合维生素Ⅰ(VA 9000 IU、VD33000 IU、VE 30 IU);试验2组添加83 g/(头·d)复合维生素Ⅱ(VA 8300 IU、VD32490 IU、VE 24.9 IU),试验3组添加98 g/(头·d)复合维生素Ⅲ(VA 7840 IU、VD31960 IU、VE 19.6 IU)。预试期14 d,正式试验期90 d。结果显示,试验组育肥牛的平均日增重较对照组分别增加了2.91%、1.94%和1.94%(P<0.05),背膘厚度较对照组分别增加了10.97%、10.68%和9.37%(P<0.05)。与对照组相比,试验组牛肉的滴水损失显著降低(P<0.05),剪切力分别降低了14.11%、13.09%和13.85%(P<0.05),肉色的L^(*)值、b^(*)值显著升高(P<0.05)。试验组牛肉的丝氨酸含量显著高于对照组(P<0.05),胱氨酸含量显著低于对照组(P<0.05)。研究表明,额外添加复合维生素能够改善育肥牛的生长性能、屠宰性能及肉品质,其中以VA 120 IU/g、VD340 IU/g和VE 0.4 IU/g所形成的组合添加75 g/(头·d)效果较好。

关键词：育肥牛复合维生素生长性能屠宰性能肉品质

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Comparative transcriptome analysis between rhesus macaques(Macaca mulatta) and crab-eating macaques(M. fascicularis)

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Zoological Research 2024年第2期45卷 299-310页

作者： Yu-Xiang mao Yamei Li Zikun Yang Ning Xu Shilong Zhang Xuankai Wang Xiangyu Yang Qiang sun Yafei mao Institute of Neuroscience State Key Laboratory of NeuroscienceCenter for Excellence in Brain Science&Intelligence TechnologyChinese Academy of SciencesShanghai 200031China Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology Shanghai 201210China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Genetic Evolution&Animal Models Chinese Academy of SciencesKunmingYunnan 650201China Bio-X Institutes Key Laboratory for the Genetics of Developmental and Neuropsychiatric DisordersMinistry of EducationShanghai Jiao Tong UniversityShanghai 200030China Zhiyuan College Shanghai Jiao Tong UniversityShanghai 200240China Center for Genomic Research International Institutes of MedicineFourth Affiliated HospitalZhejiang UniversityYiwuZhejiang 322000China

Understanding gene expression variations between species is pivotal for deciphering the evolutionary diversity in phenotypes. Rhesus macaques(Macaca mulatta, MMU)and crab-eating macaques(M. fascicularis, MFA) serve as crucial nonhuman primate biomedical models with different phenotypes. To date, however, large-scale comparative transcriptome research between these two species has not yet been fully explored. Here, we conducted systematic comparisons utilizing newly sequenced RNA-seq data from84 samples(41 MFA samples and 43 MMU samples)encompassing 14 common tissues. Our findings revealed a small fraction of genes(3.7%) with differential expression between the two species, as well as 36.5% of genes with tissue-specific expression in both macaques. Comparison of gene expression between macaques and humans indicated that 22.6% of orthologous genes displayed differential expression in at least two tissues. Moreover,19.41% of genes that overlapped with macaque-specific structural variants showed differential expression between humans and macaques. Of these, the FAM220A gene exhibited elevated expression in humans compared to macaques due to lineage-specific duplication. In summary,this study presents a large-scale transcriptomic comparison between MMU and MFA and between macaques and humans. The discovery of gene expression variations not only enhances the biomedical utility of macaque models but also contributes to the wider field of primate genomics.

关键词： Crab-eating macaques Rhesus macaques Comparative transcriptomics Biomedical models Nonhuman primates RNA-seq Duplicated genes

医学院校大学生对劳动教育评价的认识和需求调查分析

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中国高等医学教育 2024年第2期 28-29,52页

作者：李玮张春泥孙茂赵亚坤何辰怡艾华北京中医药大学北京100029

目的:全面了解并分析医学院校学生对劳动教育评价的认识与需求。方法:采用方便抽样方法,对北京中医药大学3672名1~5年级本科生进行问卷调查。结果:学生看重与专业实习相关的劳动教育评价,重要性选择率为89.30%;男生及低年级学生更重视... 详细信息

目的:全面了解并分析医学院校学生对劳动教育评价的认识与需求。方法:采用方便抽样方法,对北京中医药大学3672名1~5年级本科生进行问卷调查。结果:学生看重与专业实习相关的劳动教育评价,重要性选择率为89.30%;男生及低年级学生更重视劳动教育评价;学生更加关注志愿服务、社会实践与实习、社团活动的劳动教育评价。结论:高等医学院校学生劳动教育评价应针对学生所处不同年级、专业培养特色及第二课堂实际情况进行统筹与科学设计,从而达到培养学生正确的劳动价值观和良好劳动品质的目的。

关键词：医学院校劳动教育评价

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动物飞行的空气动力学

空气动力学学报 2018年第1期36卷 122-128页

作者：孙茂北京航空航天大学流体力学研究所北京100191

昆虫、鸟和兽(蝙蝠)的飞行是由作用于其上的气动力所决定的。了解这些力的产生机制和规律,是研究相关动物的比较生理学、行为学、生态学及进化的基础,也能为发展新型飞行器提供仿生学指导。本文介绍了近二十余年来该领域的主要研究进展... 详细信息

昆虫、鸟和兽(蝙蝠)的飞行是由作用于其上的气动力所决定的。了解这些力的产生机制和规律,是研究相关动物的比较生理学、行为学、生态学及进化的基础,也能为发展新型飞行器提供仿生学指导。本文介绍了近二十余年来该领域的主要研究进展,并讨论未来发展趋势和需要开展的工作。文中依次讨论了昆虫、鸟类和蝙蝠拍动飞行的空气动力学机理;最后提出了今后5~10年的工作建议。

关键词：空气动力学动物飞行昆虫鸟蝙蝠

Impact of the carbon market on investment benefits of power-grid enterprises in China: a system dynamics analysis

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Global Energy Interconnection 2024年第4期7卷 402-414页

作者： Wanning mao Liang Hu Wenjuan Niu Xiaorong sun Lili Hao Abimbola Susan Ajagun School of Public Administration Hohai University211100NanjingP.R.China Business School Hohai UniversityNanjing 211100P.R.China School of Electrical and Power Engineering Hohai UniversityNanjing211100P.R.China College of Electrical Engineering&Control Science Nanjing Tech UniversityNanjing 211816P.R.China School of Electrical Engineering and Technology Federal University of TechnologyMinnaNigeria

The power grid,as the hub connecting the power supply and consumption sides,plays an important role in achieving carbon neutrality in *** emerging carbon markets,assessing the investment benefits of power-grid enterprises is ***,studying the impact of the carbon market on the investment and operation of powergrid enterprises is key to ensuring their efficient ***,few studies have examined the interaction between the carbon and electricity markets using system dynamics models,highlighting a research gap in this *** study investigates the impact of the carbon market on the investment of power-grid enterprises using a novel evaluation system based on a system dynamics model that considers carbon-emissions from an established carbon-emission accounting ***,an index system for benefit evaluation was constructed from six aspects:financing ability,economic benefit,reliability,social responsibility,user satisfaction,and carbon-emissions.A system dynamics model was then developed to reflect the causal feedback relationship between the impact of the carbon market on the investment and operation of power-grid *** simulation results of a provincial power-grid enterprise analyze comprehensive investment evaluation benefits over a 10-year period and the impact of carbon emissions on the investment and operation of power-grid *** study provides guidelines for the benign development of power-grid enterprises within the context of the carbon market.

关键词： Carbon market Power-grid enterprises Investment benefit evaluation System dynamics analysis

微型飞行器的仿生力学——蜜蜂悬停飞行的动稳定性研究

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航空学报 2005年第4期26卷 385-391页

作者：孙茂熊燕北京航空航天大学流体力学研究所北京100083

研究蜜蜂悬停飞行的纵向动稳定性问题。用数值求解NS方程的方法计算拍动翅及身体的气动导数;用特征模态分析方法求解运动方程。蜜蜂悬停飞行的纵向扰动运动由3个特征模态构成:不稳定振荡模态、快衰减模态、慢衰减模态。不稳定振荡模态... 详细信息

研究蜜蜂悬停飞行的纵向动稳定性问题。用数值求解NS方程的方法计算拍动翅及身体的气动导数;用特征模态分析方法求解运动方程。蜜蜂悬停飞行的纵向扰动运动由3个特征模态构成:不稳定振荡模态、快衰减模态、慢衰减模态。不稳定振荡模态主要为俯仰与水平方向的振荡运动;向前运动伴随上仰运动,向后运动伴随下俯运动,这种水平运动与俯仰运动的耦合产生的与转动方向同向的力矩,是不稳定的原因。快衰减模态主要为单调下俯和向前(或上仰和向后)运动。慢衰减运动主要为下沉(或上升)运动。由于不稳定振荡模态的存在,蜜蜂的悬停飞行是动不稳定的,扰动增长的倍幅时间(0.11s)是拍动周期(5.1ms)的22倍,这对蜜蜂来说是较慢的。这里的结果也许可解释蜜蜂为何悬停得很平稳,同时机动性也很好:扰动增长慢,易于调整翅的运动以抑制之(昆虫可在远小于拍动周期的时间内调整其翅膀的运动);而稳定性弱或不稳定为高机动性提供了基础。

关键词：仿生力学蜜蜂悬停动稳定性 N-S方程数值解模态分析

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蜂蝇悬停和前飞时的动稳定性

北京航空航天大学学报 2015年第1期41卷 133-140页

作者：许娜孙茂北京航空航天大学航空科学与工程学院北京100191

悬停和前飞是昆虫常用的两种飞行状态,研究昆虫在这两种状态下的动稳定性问题对昆虫飞行动力学研究工作具有重要意义.基于"平均模型"和小扰动线化的思想,给出了昆虫绕平衡点处纵向和横向的小扰动运动方程;通过计算流体力学方法获得气动... 详细信息

悬停和前飞是昆虫常用的两种飞行状态,研究昆虫在这两种状态下的动稳定性问题对昆虫飞行动力学研究工作具有重要意义.基于"平均模型"和小扰动线化的思想,给出了昆虫绕平衡点处纵向和横向的小扰动运动方程;通过计算流体力学方法获得气动导数,并利用特征模态分析法求解运动方程,研究了蜂蝇悬停和前飞时的动稳定性.结果证明,悬停时纵向和横向扰动运动均存在不稳定模态,悬停是不稳定的;前飞时,纵向扰动运动的不稳定模态的倍幅期较悬停时减小,其纵向不稳定性逐渐增强,而横向不稳定性较悬停时减弱,趋于较弱或中性的稳定;前飞是不稳定的.

关键词：蜂蝇悬停前飞动稳定性特征模态

Expression of miR-1304 in patients with esophageal carcinoma and risk factors for recurrence

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World Journal of Gastroenterology 2020年第6期26卷 670-685页

作者： Yun-Gang Luo Li-Wei Duan Xuan Ji Wen-Yuan Jia Yun Liu mao-Lei sun Guo-Min Liu Jilin Provincial Medicine Anti-Tumor Engineering Center the Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina Department of Stomatology the Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina Department of Gastroenterology the Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina Department of Orthopedics the Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina

BACKGROUND Esophageal carcinoma is a malignant gastrointestinal tumor with a very poor ***(miR)-1304 is a newly discovered non-coding RNA,which shows differential expression in other cancers,and its clinical value in esophageal carcinoma remains *** To explore the expression of miR-1304 in patients with esophageal carcinoma and its clinical *** The expression of miR-1304 in patients with esophageal carcinoma was analyzed based on the data on miR in esophageal carcinoma downloaded from The Cancer Genome Atlas *** real-time polymerase chain reaction was adopted to determine the expression of miR-1304 in the tissues and serum of *** clinical diagnostic value of miR-1304 and independent factors for recurrence and prognosis of esophageal carcinoma were then *** potential target genes of miR-1304 were predicted,and then analyzed based on gene ontology,Kyoto Encyclopedia of Genes,and Genomes,and protein-protein *** The expression of miR-1304 in the tissues and serum of patients with esophageal carcinoma increased,and was also increased according to the *** with high expression of miR-1304 suffered increased rates of tumor≥3 cm,low differentiation and stage II+***-1304 had a diagnostic value in identifying esophageal carcinoma,tumor size,differentiation and TNM *** size,differentiation,TNM stage,and miR-1304 were independent risk factors for recurrence of esophageal carcinoma,and they had certain predictive and diagnostic value for the recurrence of esophageal ***-eight patients showed a 3-year survival rate of 38.46%,and patients with high expression of miR-1304 had a relatively lower survival *** analysis revealed that tumor size,differentiation,recurrence and miR-1304 were independent factors for the prognosis of ***,miRDB,and Targetscan predicted 20 target genes in *** ontology enrichment analysis found 18 func

关键词： miR-1304 Recurrence Prognosis Diagnosis Bioinformatics analysis The Cancer Genome Atlas Esophageal carcinoma

微型飞行器的仿生力学——蝴蝶飞行的气动力特性

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北京航空航天大学学报 2006年第10期32卷 1146-1151页

作者：孙茂黄华北京航空航天大学航空科学与工程学院北京100083 北京航空航天大学航空科学与工程学院

研究一种蝴蝶(Morpho peleides)前飞时的气动力特性.在运动重叠网格上数值求解Navier-Stokes方程,对蝴蝶前飞时左、右翅膀的拍动运动以及跟随身体一起的俯仰运动进行计算.结果表明:蝴蝶主要用“阻力原理”作拍动飞行,即平衡身体重量的... 详细信息

研究一种蝴蝶(Morpho peleides)前飞时的气动力特性.在运动重叠网格上数值求解Navier-Stokes方程,对蝴蝶前飞时左、右翅膀的拍动运动以及跟随身体一起的俯仰运动进行计算.结果表明:蝴蝶主要用“阻力原理”作拍动飞行,即平衡身体重量的举力和克服身体阻力的推力均主要由翅膀的阻力提供.蝴蝶翅在下拍中产生很大的瞬态阻力(平行于拍动运动的力),对流动结构分析表明,产生此力的机制如下:每次下拍中产生了一个由前缘涡,翅端涡及起动涡构成的强“涡环”,其包含一个沿拍动方向的射流,产生此射流的反作用力即翅膀的阻力.平衡身体重量的举力主要由翅膀下拍中产生的阻力提供.上拍时(由于身体上仰,上拍实际是向后和向上拍动的),翅也产生阻力,但较下拍时小的多.平衡身体阻力的推力主要由翅膀上拍中产生的阻力提供.

关键词：拍动飞行蝴蝶气动力 N-S方程数值解