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ANIMAL NUTRITION 2024年第3期18卷 272-283页

作者： Zhang, Jing bu, lijun Liu, Yapeng Huo, Wenjie Xia, Chengqiang Pei, Caixia Liu, Qiang Shanxi Agr Univ Coll Anim Sci Taigu 030801 Shanxi Peoples R China

Lauric acid (LA) has the possibility to improve milk production in dairy cows by improving mammary gland development, however, the mechanism by which it might regulate mammary gland development is unclear. The influence of LA on milk production, nutrient digestibility and the expression of proteins related to mammary gland development in dairy cows were evaluated. Forty primiparous Holstein dairy cows were divided into 4 groups in a randomized block design. Four treatments included the control (0 g/d LA per cow), low-LA (100 g/d LA per cow), medium-LA (200 g/d LA per cow), and high-LA (300 g/ d LA per cow). Yields of milk, fat-corrected milk, and energy-corrected milk quadratically increased (P but that of C16:0 fatty acid linearly decreased (P 1/4 0.046). Supplementation of LA led to a linear and quadratical increase (P but a linear reduction (P 1/4 0.018) in the ratio of acetate to propionate. The enzymatic activities of ruminal pectinase, xylanase, and a-amylase, and populations of total bacteria and anaerobic fungi increased linearly (P bumin and total protein concentrations increased quadratically (P < 0.05). Moreover, addition of 200 g/d LA promoted (P < 0.05) the expression of protein involved in mammary gland development and fatty acids synthesis. These results suggested that LA addition enhanced milk production and fatty acids synthesis by sti

关键词： Lactation performance Lauric acid Mammary gland development Milk fat synthesis Nutrient digestibility RUMINAL PROTOZOA NUMBERS EPITHELIAL-CELLS MILK-PRODUCTION COCONUT OIL FERMENTATION PATTERN METHANE PRODUCTION FATTY-ACIDS RUMEN DIGESTION PROLIFERATION

丁酸钠通过G蛋白偶联受体41介导蛋白激酶B/哺乳动物雷帕霉素靶蛋白信号通路刺激牛乳腺上皮细胞增殖

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动物营养学报 2024年第3期36卷 1878-1891页

作者：张静卜丽君郎姣姣刘亚鹏夏呈强霍文婕刘强山西农业大学动物科学学院太谷030801

本试验旨在研究丁酸钠(SB)刺激牛乳腺上皮细胞(BMECs)增殖的分子机制。采用单因素设计,以含不同浓度(0、15、30、45、60和75μmol/L)SB的DMEM/F12培养基(含10%新生胎牛血清)培养BMECs,通过细胞计数试剂盒(CCK⁃8)检测细胞活性,确定适宜S... 详细信息

本试验旨在研究丁酸钠(SB)刺激牛乳腺上皮细胞(BMECs)增殖的分子机制。采用单因素设计,以含不同浓度(0、15、30、45、60和75μmol/L)SB的DMEM/F12培养基(含10%新生胎牛血清)培养BMECs,通过细胞计数试剂盒(CCK⁃8)检测细胞活性,确定适宜SB浓度。然后以对照(0μmol/L)和适宜SB浓度培养BMECs,并采用蛋白激酶B(Akt)阻断剂(AKT⁃IN⁃1)、哺乳动物雷帕霉素靶蛋白(mTOR)阻断剂雷帕霉素(Rap)或小干扰RNA(siR⁃NA)沉默G蛋白偶联受体41(GPR41)对信号通路及受体进行处理,检测BMECs细胞增殖、凋亡以及GPR41和Akt/mTOR信号通路相关基因和蛋白表达的变化。结果表明:1)与对照组相比,60μmol/L的SB显著提高了BMECs细胞活力(P0.05)。3)与对照组相比,60μmol/L的SB极显著提高了GPR41的mRNA相对表达量(P<0.01),显著提高了GPR41蛋白相对表达量(P<0.05)。GPR41 siRNA沉默GPR41后完全逆转了60μmol/L SB对BMECs增殖的促进作用以及Akt/mTOR信号通路相关的增殖基因和蛋白的mRNA或蛋白表达(P<0.05或P<0.01)。由此可见,60μmol/L SB可通过GPR41介导Akt/mTOR信号通路促进BMECs增殖。

关键词： Akt mTOR 信号通路牛乳腺上皮细胞增殖丁酸钠

Dietary supplementation of sodium butyrate enhances lactation performance by promoting nutrient digestion and mammary gland development in dairy cows

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Animal Nutrition 2023年第4期15卷 137-148页

作者： Jing Zhang lijun bu Yapeng Liu Wenjie Huo Chengqiang Xia Caixia Pei Qiang Liu College of Animal Sciences Shanxi Agricultural UniversityTaigu 030801China

This experiment was to evaluate the influence of sodium butyrate(SB)addition on milk production,ruminal fermentation,nutrient digestion,and the development and metabolism regulation of the mammary gland in dairy *** Holstein dairy cows averaging 710±18.5 kg body weight,72.8±3.66 d in milk(DIM),and 41.4±1.42 kg/d milk production were divided into four treatments blocked by DIM and milk *** were control group,low SB,medium SB,and high SB with 0,100,200 and 300 g/d of SB addition per cow,*** study lasted for 105 *** of milk,milk protein and lactose quadratically increased(Pbus,***,butyrivibrio fibrisolvens,Fibrobacter succinogenes,and Ruminobacter amylophilus linearly increased(Pbut decreased(P<0.05)mRNA and protein expressions of Bax,caspase-3,and *** results suggest th

关键词： Sodium butyrate Lactation performance Nutrient digestion Milk fat synthesis Mammary gland development

A two-field-scan harmonic Hall voltage analysis for fast,accurate quantification of spin-orbit torques in magnetic heterostructures

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 105-112页

作者： Xin Lin lijun Zhu State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

We report on the development of a“two-field-scan”harmonic Hall voltage(HHV)analysis,which collects the second HHVas a function of a swept in-plane magnetic field at 45°and 0°relative to the excitation current,for the determination of the spin-orbit torques of transverse spins in magnetic heterostructures without significant perpendicular spins,longitudinal spins,and longitudinal/perpendicular Oersted *** demonstrate that this two-field-scan analysis is as accurate as the well-established but time-consuming angle-scan HHV analysis even in the presence of considerable thermoelectric effects but takes more than a factor of 7 less measurement *** also show that the fit of the HHV data from a single field scan at 0°,which is commonly employed in the literature,is not reliable because the employment of too many free parameters in the fitting of the very slowly varying HHV signal allows erroneous conclusion about the spin-orbit torque efficiencies.

关键词： spin-orbit torque spin current spin-orbit coupling spintronics

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Tracking Microorganisms in Production and Sale Operations of Spiced Geese

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Food and Nutrition Sciences 2013年第9期4卷 950-955页

作者： Huadong Xie lijun bu Zhengze Zhong Yifan Zhang Jun Lin Zhixi Li Chongqing Academy of Animal Science Key Laboratory of Pig Industry Sciences Ministry of Agriculture Chongqing Key Laboratory of Pig Industry Sciences Chongqing China Chongqing Municipal Agricultural School Chongqing China Department of Food Science and Engineering Northwest A & F University Xianyang China.

Cooling, transportation and sale processes of spiced geese were studied, eight spiced geese meat samples with different sampling time, Airborne microorganism samples of three different workplaces and five different environmental contact substance samples were test, measures of special mediums, biochemical identification and DNA sequencing were carried out, then Escherichia coli, Yeast, Mildew, Lactic acid bacteria, Staphylococcus aureus and Janthinobacterium were detected. For spiced geese meat samples, microorganisms were significant (p ) increased with the prolong of sampling time. Lactic acid bacteria, Staphylococcus aureus and Janthinobacterium were detected in each processing operation and the total aerobic counts of each sample was increased or significant (p ) increased with the prolong of sampling time;Escherichia coli, Yeast and Mildew were detected on samples entered into the retail outlet mainly and the total aerobic counts of each sample was increased or significant (p ) increased also. In the household workshop, Mildew and Janthinobacterium were the superior microorganisms. In the transport vehicle, Staphylococcus aureus and Janthinobacterium were the superior microorganisms;Staphylococcus aureus was the superior microorganism in the retail outlet. For environmental contact substances, Cooling platform, pallet, chopping block were the most serious contaminated environmental contact substances and the total bacteria counts were significant (p ) more than stainless steel barrel and chopper;Janthinobacterium was the superior microorganism on pallet, stainless steel barrel and chopper;Lactic acid bacteria was the superior microorganism on chopping block and stainless steel barrel;Staphylococcus aureus was the superior microorganism on cooling platform. Findings indicate that Escherichia coli, Yeast, Mildew, Lactic acid bacteria, Staphylococcus aureus, Janthinobacterium were the main microorganisms;Household workshop and the retail outlet were the main place

关键词： Spiced Geese Meat Microbial Contamination Production Operations Sale Operations

Effects of sorghum distillers dried grains with solubles on the carcass characteristics and muscle quality of China Micro Duck drakes aged from 4 to 8 weeks

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Effects of sorghum distillers dried grains with solubles on ...

Discovery of strong bulk Dzyaloshinskii-Moriya interaction in composition-uniform centrosymmetric magnetic single layers

第七届中国畜牧科技论坛

作者： Xie huadong bu lijun Zhong zhengze Huang yong Peng xiangwei Li dajun Chongqing Academy of Animal Science

A study was conducted to determine the effects of feeding sorghum distiller’s dried grains with solubles(SDDGS) on carcasses characteristics(live weight,whole net carcass rate,breast muscle percentage,thigh muscle percentage),muscle quality(meat color,shear stress,cooking loss rate,cooked meat percentage) and meat composition of China Micro Duck(CMD) drakes aged from 4 to 8 weeks.A total of 240 CMD drakes(aged 4 weeks and initial weight were 496.7 g) were randomly allotted to 1 of 4 dietary treatments in randomized complete block *** four treatments were SO(the control group),S5,S10,S15,indicate the dietary content of SDDGS(0,5,10 and 15%,respectively).Each treatment with60 drakes were equally divided into 6 repeated test groups,each group with 10 *** results showed that,on other carcass characteristic and muscle quality indexes of living body weight(BW),whole net carcass yield(WNCY),breast muscle percentage(BMP),breast muscle color(BMC),thigh muscle colo(TMC),breast shear strength(BSS),cooking loss(CD,cooked meat percentage(CMP).For meat composition,the increasing level of SDDGS caused a linear and quadratic decrease(p0.05).Overall,this study revealed that in the three kinds of diets with SDDGS,S5 caused the minimal negative impact on carcass characteristics,muscle quality and meat composition.

关键词： SDDGS China Micro Duck carcass characteristic muscle quality

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 174-180页

作者： lijun Zhu David Lujan Xiaoqin Li State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Department of Physics Center for Complex Quantum SystemsUniversity of Texas at AustinAustin 78712USA

Dzyaloshinskii-Moriya interaction(DMI)is the key ingredient of chiral spintronic phenomena and the emerging technologies based on such phenomena.A nonzero DMI usually occurs at magnetic interfaces or within non-centrosymmetric single ***,we report the observation of a strong unexpected DMI within a centrosymmetric polycrystalline ferromagnet that has neither a crystal inversion symmetry breaking nor a composition *** DMI is a bulk effect,increases with the thickness of the magnetic layer,and is insensitive to the symmetry of the interfaces or the neighboring *** observe a total DMI strength that is a factor of>2 greater than the highest interfacial DMI in the *** DMI most likely arises from the strong spin-orbit coupling,strong orbital hybrization,and a“hidden”long-range asymmetry in the *** discovery of the strong unconventional bulk DMI in centrosymmetric,composition-uniform magnetic single layers provides fundamental building blocks for the emerging field of spintronics and will stimulate the exploitation of unconventional spin-orbit phenomena in a wide range of materials.

关键词： Brillouin light scattering Dzyaloshinskii-Moriya interaction spin wave

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基于紫外指纹图谱技术的食醋品种检测方法

农业机械学报 2009年第4期40卷 133-138页

作者：解华东布丽君李志西西北农林科技大学食品科学与工程学院陕西杨凌712100

以不同食醋为研究对象,采用旋转蒸发、紫外光谱扫描等手段研究了波长范围、蒸发液稀释比例、蒸发温度和参比液质量浓度等对食醋紫外吸收曲线的影响,确定了食醋紫外指纹图谱检测方法的试验条件：扫描波长范围245-330 nm,蒸发液稀释比例1... 详细信息

以不同食醋为研究对象,采用旋转蒸发、紫外光谱扫描等手段研究了波长范围、蒸发液稀释比例、蒸发温度和参比液质量浓度等对食醋紫外吸收曲线的影响,确定了食醋紫外指纹图谱检测方法的试验条件：扫描波长范围245-330 nm,蒸发液稀释比例1∶6,蒸发温度45℃,冰醋酸参比液质量浓度45 g/L。以曲线间的相似度为指标验证了方法的重现性、稳定性和差异性,结果表明：各个食醋样品3次重复测定的指纹图谱间相似度均大于0.90,同一样品图谱的重现性良好;各个食醋样品在不同存放期的紫外指纹图谱间相似度均大于0.90,同一样品图谱的稳定性良好;各个不同食醋样品的紫外指纹图谱之间的相似度均小于0.90,不同样品图谱的差异性良好。

关键词：食醋检测紫外光谱指纹图谱

Integrated wellbore-reservoir-geomechanics modeling for enhanced interpretation of distributed fiber-optic strain sensing data in hydraulicfracture analysis

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3136-3148页

作者： lijun Liu Xinglin Guo Xiaoguang Wang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China Tianfu Yongxing Laboratory Chengdu610213China College of Energy Chengdu University of TechnologyChengdu610059China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu610059China

Fiber-optic distributed strain sensing(FO-DSS)has been successful in monitoring strain changes along horizontal wellbores in hydraulically fractured ***,the mechanism driving the various FO-DSS responses associated with near-wellbore hydraulic fracture properties is still *** address this knowledge gap,we use coupled wellbore-reservoir-geomechanics simulations to study measured strain-change behavior and infer hydraulic fracture *** crossflow among fractures is captured through explicit modeling of the transient wellbore *** addition,local grid refinement is applied to accurately capture strain changes along the fiber.A Base Case model was designed with four fractures of varying properties,simulating strain change signals when the production well is shut-in for 10 d after 240 d of production and reopened for 2 ***-pressure plots for different fracture clusters were used to gain insights into inferring fracture properties using DSS *** comparing the model with and without the wellbore,distinct strain change signals were observed,emphasizing the importance of incorporating the wellbore in FO-DSS *** effects of fracture spacing and matrix permeability on strain change signals were thoroughly *** results of our numerical study can improve the understanding of the relation between DSS signals and fracture hydraulic properties,thus maximizing the value of the dataset for fracture diagnostics and characterization.

关键词： Distributed strain sensing Fracture diagnostic Coupled flow and geomechanics Transient wellbore flow

Mean field game of optimal relative investment with jump risk

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Science China Mathematics 2024年第5期67卷 1159-1188页

作者： lijun Bo Shihua Wang Xiang Yu School of Mathematics and Statistics Xidian UniversityXi'an 710126China School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China Department of Applied Mathematics The Hong Kong Polytechnic UniversityHong KongChina

In this paper,we study the n-player game and the mean field game under the constant relative risk aversion relative performance on terminal wealth,in which the interaction occurs by peer *** the model with n agents,the price dynamics of underlying risky assets depend on a common noise and contagious jump risk modeled by a multi-dimensional nonlinear Hawkes *** a continuum of agents,we formulate the mean field game problem and characterize a deterministic mean field equilibrium in an analytical form under some conditions,allowing us to investigate some impacts of model parameters in the limiting model and discuss some financial ***,based on the mean field equilibrium,we construct an approximate Nash equilibrium for the n-player game when n is sufficiently *** explicit order of the approximation error is also derived.

关键词： relative performance contagious jump risk mean field game with jumps mean field equilibrium approximate Nash equilibrium