Assessment of Negative Training on the Use of Cubicle Beds by Heifers     

Bao Jun  Giller P.S.. 《东北农业大学学报(英文版)》1996,(2)

40 in-calf heifers were observed to examine the effect of timbers placing in passage area on their use of cubicle beds. Prior to the experiment preliminary observation was taken on these 40 heifers and they were divided into two even groups (cubicle user(or control) group versus cubicle refusal (or experimental) group by whether they properly used the cubicle beds or not. The timbers were placed in passage and feeding areas for the cubicle refusal group to force the animls to lie in the cubicle beds. The results of this experiment showed that feeding behaviour was unaffected by the presence of the timbers, but lying acitvity was about 8% higher for the experimental group, which led to a mean of almost 2 hours longer lying time over 24 h. After the timbers were removed, there was a significant decline in lying by the experimental group. The diurnal pattern of lying behaviour in cubicles indicated that the major effect on lying activity exerted by the presence of the timbers was seen during midnight to 10:00 a  相似文献   

Impact of fluxapyroxad on the microbial community structure and functional diversity in the silty-loam soil     

WU Xiao-hu  XU Jun  LIU Yong-zhuo  DONG Feng-shou  LIU Xin-gang  ZHANG Wen-wen  ZHENG Yong-quan 《中国农业科学(英文版)》2015,(1):114-124

The aim of this work was to assess the effect of applying three different doses of fluxapyroxad on microbial activity, community structure and functional diversity as measured by respiration, microbial biomass C, phospholipid fatty acid(PLFA) and community-level physiological profiles(CLPPs). Our results demonstrated that substrate-induced respiration(on day 15) and microbial biomass C(on days 7 and 15) were inhibited by fluxapyroxad, but stimulation was observed thereafter. In contrast, fluxapyroxad addition increased the basal respiration and metabolic quotients(q CO2) and respiratory quotients(QR). Analysis of the PLFA profiles revealed that the total and bacterial biomass(both Gram-positive bacteria(GP) and Gram-negative bacteria(GN)) were decreased within the initial 15 days, whereas those as well as the GN/GP ratio were increased at days 30 and 60. F luxapyroxad input decreased the fungi biomass but increased the bacteria/fungi ratio at all incubation time. Moreover, high fluxapyroxad input(75 mg fluxapyroxad kg–1 soil dry weight) increased the microbial stress level. A principal component analysis(PCA) of the PLFAs revealed that fluxapyroxad treatment s ignificantly shifted the microbial community structure, but all of the observed effects were transient. Biolog results showed that average well color development(AWCD) and functional diversity index(H′) were increased only on day 60. I n addition, the dissipation of fluxapyroxad was slow in soil, and the degradation half-lives varied from 158 to 385 days depending on the concentration tested.  相似文献   

Seed-specific overexpression of cotton GhDGAT1 gene leads to increased oil accumulation in cottonseed     

Peng Wu  Xiaolan Xu  Jingwen Li  Jun Zhang  Siyuan Chang  Xiyan Yang  Xiaoping Guo 《作物学报(英文版)》2021,(2):487-490

As the main byproduct of cotton fiber,the cotton seed yields about 1.6 times that of fiber,with its oil rich in unsaturated fatty acids,mainly linoleic acid.It is desirable for breeders to increase the oil content of cottonseed without affecting the yield and quality of cotton fiber.In this study,a seed-specific promoter-(alpha-globulin gene promoter-)driven GhDGAT1 overexpression vector(P_aGlob-GhDGAT1)was constructed and used to transform an upland cotton line YZ1(Gossypium hirsutum).Overexpression of the cotton gene GhDGAT1 in cotton seeds increased its total oil content from 4.7%to 13.9%in different transgenic lines and different generations.With the increase of oil content,the composition and contents of the main fatty acids in cotton seed also changed,as reflected by the contents of the main saturated fatty acids and unsaturated oleic acid.GhDGAT1 could be used to increase oil content and improve oil composition in cottonseed.  相似文献   

Biocompatibility of Acellular Porcine Dermis     

SU Ai-hu  WANG Yuan-liang  TANG Li-ling  PAN Jun  LUO Yan-fengstry of Education  College of Bioengineering  Chongqing University  Chongqing  Chin 《保鲜与加工》2004,(2):99-101

In vitro cultured vascular endothelial cells (VEC) and mouse 3T3 fibroblasts (3T3) on the acellular dermal matrix , which were made of porcine skins. We made the cell proliferation test with MTT assay and the histological observation after cells were seeded on the acelluar dermis for 1 week with histological section. The cell growth curves showed VEC and 3T3 grew much rapidly on the acelluar dermis.The histological observation revealed VEC had formed a monolayer, some places even had formed 2 to 3 layer. The results suggest that the acelluar porcine dermal matrix have good biocompatibility , it will be widely applied.  相似文献   

The Design of Heart Function Detection System Based on the Virtual Instrument     

PI Xi-tian  HEI Xiao-guang  ZHENG Xiao-Lin  CHEN Feng  LI Yong-an  HOU Wen-sheng  YANG Jun  LU Bo 《保鲜与加工》2007,(9):109-112

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Industry Experiment on Parameter Optimizing of Final Electromagnetic Stirring     

LIN Guo-qiang  XIE Zhi  YU Xiao-fang  LI Jun  KONG Fan-jie  JIA Guang-lin 《保鲜与加工》2007,(9):56-59

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Dynamics of Actin Polymerization     

CHENG Chao  WANG Yuan-liang  ZHANG Jun  QIN Su-Hua 《保鲜与加工》2005,(4):131-135

The process of actin polymerization and depolymerization have some relation with its function,the activation of such process is compatible to its functions. The polymerization progress is divided into four steps: The first step is the activation of the monomer actin. The nucleation of actin nucleus forms in the second step which limits the polymerization speed. The elongation of the F-actin filaments happens in the following step. In the last step, a steady-state is attained, the length of the filament does not change because the polymerizing rate in the barbed end is the same with the depolymerizing rate in the pointed end. Some factors which affect the polymerizing process, such as nucleotide, actin related proteins are discussed. The aim is to know more about how to assemble the complicated system with biomacromolecule and what to function.  相似文献   

Determination of Total Cysteine in Plasma by High Performance Liquid Chromatography and Ultraviolet Detection     

DING Min  HE Jun  YE Lian  CHENG Shu-hui  BAO Hong-yong 《保鲜与加工》2005,(5):116-119

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Design of Analysis and Evaluation Application System for Ride Comfort     

LU Hai-feng  LI Ming  LI Jun 《保鲜与加工》2005,(6):12-14

The stimulation and the optimal design for bus ride comfort have played an importable roles in design and reform of automobile products. The new vibration comfort coefficient is applied to evaluate the ride comfort of automobile, and the software is developed. It is verified that the study has theoretical and practical value significantly.  相似文献   

Design of Reef- blasting Project and Analysis of Regulation Effect for Fuling to Tongluo Canyon Reach in Three Gorges Reservoir Region     

LUO Hong  ZHU - Jun - feng 《保鲜与加工》2006,(5):47-50

After the completion of the Three Gorges project,the navigation conditions of the reservoir region will be improved evidently,which has laid the foundation for straight run of the 10,000-ton-class fleet to Chongqing Port,and is the promotion of the development of shipping in Yangtze River.But according to the standard of the 10,000-ton-class fleet,there are still some reaches of the reservoir region can not meet the requirements of the waterway on smooth and safe navigation.Therefore,some regulation measures should be adopted to eliminate these obstructions.It is one of the important parts in the reservoir region waterway regulation work for the Fuling to Tongluo canyon reach blasting project.30 reef obstacle blocks of 14 reaches in this project were removed by blasting.Based on the analysis of obstruct features of various rocks,according to the standard of the 10,000-ton-class fleet,the design parameters and blasting regulation program were put forward,and the regulation effect is analyzed and forecasted.  相似文献