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Phosphine ligands featuring C-N chiral axis applicable to tetra-ortho-substituted biaryl synthesis

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Chinese Chemical letters 2023年第7期34卷 3-5页

作者： Weiwei Fang Meiying Kuai James h.Clark Tao Tu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China Circa Renewable Chemistry Institute Green Chemistry Centre of ExcellenceUniversity of YorkYork YO105DDUnited Kingdom Shanghai Key laboratory of Molecular Catalysis and Innovative Materials Department of ChemistryFudan UniversityShanghai 200433China State Key laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Asymmetric catalysis has been one of the most effective strategies for building up a chirality in the favored stereoisomer. Over the past decades, various sophisticated chiral ligands and catalysts have been well-designed, which enable great advances in enantioselective chemical transformations, for achieving excellent selectivity and activity.

关键词： chiral substituted applicable

FTA卡保存对虾传染性皮下和造血组织坏死病毒DNA洗脱方法的优化

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渔业科学进展 2024年第3期45卷 193-202页

作者：连新宇王秀华李晨张庆利苟紫玥吕若萱杨冰浙江海洋大学水产学院浙江舟山316022 中国水产科学研究院黄海水产研究所、青岛海洋科技中心海洋渔业科学与食物产出过程功能实验室、农业农村部海水养殖病害防治重点实验室、青岛市海水养殖流行病学与生物安保重点实验室山东青岛266071

传染性皮下和造血组织坏死病毒(infectious hypodermal and haematopoietic necrosis virus,IhhNV)是危害虾类健康养殖的重要病原,为寻找一种快捷保存及分离IhhNV DNA的方法,为后续研究提供完整的核酸材料,选用FTA(flinders technology associates)卡为保存介质,以FTA纯化试剂、TE(Tris-EDTA)缓冲液及去离子水为基础洗脱液,设计7种FTA卡黏附DNA洗脱方法,通过荧光定量PCR检测方法检验不同核酸洗脱分离效果及最低的点膜核酸量。结果显示,于4 mm2的FTA卡上,点样体积为2.5μl,用洗脱液作为模板时,最低点膜核酸浓度需要1.47×104copies/μl以上,可获得最佳的检测灵敏度和100%检出率的洗膜方法为50μl TE缓冲液于95℃下浸洗5 min;用膜片做模板,点膜核酸浓度需要1.82×103copies/μl以上,室温(20~25℃)条件下,用FTA纯化试剂洗脱3次,再用TE缓冲液洗脱2次,洗脱时间均为5 min,可获得最佳的检测灵敏度和100%的准确度。以FTA卡保存对虾白斑综合征病毒(white spot syndrome virus,WSSV)、虾肝肠胞虫(Enterocytozoon hepatopenaei,EhP)、虾十足目虹彩病毒1(Decapod iridescent virus 1,DIV1)、偷死野田村病毒(covert mortality noda virus,CMNV)、致急性肝胰腺坏死副溶血弧菌(Vibrio parahaemolyticus,VpAhPND)核酸,测试所建洗脱方法的效果,证实了该方法对其他虾类病原核酸的洗脱具有通用性。该研究给出了FTA卡保存和洗脱IhhNV DNA的适用性方案,为野外对虾样品采集、病毒核酸样品跨区域传递的保存和运输条件提供了科学数据。

关键词： IhhNV FTA卡洗脱方法优化

Microenvironmental influences on T cell immunity in cancer and inflammation

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Cellular & Molecular Immunology 2022年第3期19卷 316-326页

作者： Darren R.heintzman Emilie l.Fisher Jeffrey C.Rathmell Department of Pathology Microbiologyand ImmunologyVanderbilt University Medical CenterNashvilleTN37205USA Vanderbilt Center for Immunobiology Vanderbilt University Medical CenterNashvilleTN37205USA

T cell metabolism is dynamic and highly *** the intrinsic metabolic programs of T cell subsets are integral to their distinct differentiation and functional patterns,the ability of cells to acquire nutrients and cope with hostile microenvironments can limit these pathways.T cells must function in a wide variety of tissue settings,and how T cells interpret these signals to maintain an appropriate metabolic program for their demands or if metabolic mechanisms of immune suppression restrain immunity is an area of growing *** in inflamed and cancer tissues,a wide range of changes in physical conditions and nutrient availability are now acknowledged to shape *** include fever and increased temperatures,depletion of critical micro and macro-nutrients,and accumulation of inhibitory waste *** we review several of these factors and how the tissue microenvironment both shapes and constrains immunity.

关键词： immunometabolism T cell microenvironment cancer inflammation

母牛发情期间躯体不同部位温度变化规律研究进展

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畜牧兽医学报 2024年第4期55卷 1381-1388页

作者：修豪宇李迎军原开敏汪超杨书含吕丽华王栋中国农业科学院北京畜牧兽医研究所北京100193 山西农业大学动物科学学院太谷030801 内蒙古自治区赤峰市敖汉旗四道湾子镇党群服务中心赤峰024328 吉林农业大学动物科学技术学院长春130118

高效发情鉴定是提高母牛繁殖力、提升牛场经济效益的重要途径。随着奶牛养殖规模越来越大,传统人工观察已难以适应规模场奶牛发情鉴定需要。计步器发情鉴定难以检出安静发情,无法提高发情检出率。虽然体温参数发情鉴定潜力大,但母牛全... 详细信息

高效发情鉴定是提高母牛繁殖力、提升牛场经济效益的重要途径。随着奶牛养殖规模越来越大,传统人工观察已难以适应规模场奶牛发情鉴定需要。计步器发情鉴定难以检出安静发情,无法提高发情检出率。虽然体温参数发情鉴定潜力大,但母牛全身被毛,体表测温不理想,而接触式测温采集部位有限,可穿戴设备研发难度较大,不同采集部位牛只体温数据差别很大,为此,本文综述了前人利用奶牛躯体不同部位体温数据发情鉴定的结果,比较分析了发情奶牛各部位体温变化规律与发情的关系,为研发高效母牛发情鉴定技术提供科学参考。

关键词：母牛不同部位体温发情

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哺乳动物母性行为影响因素

生态学报 2024年第8期44卷 3107-3120页

作者：韩成全张鹏宇王慧魏彪李智远季久秀初美强杨燕吕慎金临沂大学农林科学学院临沂276000 临沂市农业科学院临沂276000 重庆市安琪儿妇产医院重庆400000

新生幼仔通常非常脆弱,需要亲代抚育才能成活,哺乳动物的亲代抚育主要由雌性完成。雌性在分娩前后所展现出的寻找分娩地点、筑造产房、分娩、舔仔、授乳、护仔等一系列动作称为母性行为,其对家养及野生动物幼仔的成活和发育均至关重要... 详细信息

新生幼仔通常非常脆弱,需要亲代抚育才能成活,哺乳动物的亲代抚育主要由雌性完成。雌性在分娩前后所展现出的寻找分娩地点、筑造产房、分娩、舔仔、授乳、护仔等一系列动作称为母性行为,其对家养及野生动物幼仔的成活和发育均至关重要。母性行为受遗传、管理等因素影响,环境中残留的各类新型污染物也给正常母性行为的激发和维持带来了新挑战。此外,虽然母性行为是评判优良个体的重要参考,但由于母性行为性状遗传力低,这使得仅从遗传角度很难做出科学评价,而应结合行为表观遗传学综合分析上述因素对母性行为的整体影响。综述了遗传、营养、环境、管理以及疾病等因素对哺乳动物母性行为的影响,并重点指出塑化剂、重金属等残留在环境中的内分泌干扰物,以及电磁污染、光污染等是母性行为异常的新诱因。此外,还对动物生产及野生动物保护工作中如何在遗传学基础上,综合优化营养、环境、管理等措施来改善和培育优良母性行为性状提出了展望。可为下一步深入探究哺乳动物母性行为影响因素及调控机制提供参考,并为预防和改善动物母性行为异常以及提高动物母性照料能力提供依据,同时,还能为探索生态健康养殖、提高母幼福利提供一定的参考。

关键词：哺乳动物母性行为影响因素研究进展新诱因

A Review of Unified A Posteriori Finite Element Error Control

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Numerical Mathematics(Theory,Methods and Applications) 2012年第4期5卷 509-558页

作者： C.Carstensen M.Eigel R.h.W.hoppe C.löbhard Department of Mathematics Humboldt Universität zu BerlinD-10099 BerlinGermany Department of Computational Science and Engineering Yonsei UniversitySeoul 120-749Korea Department of Mathematics University of HoustonHouston TX 77204-3008USA. Institute of Mathematics University of AugsburgD-86159 AugsburgGermany

This paper aims at a general guideline to obtain a posteriori error estimates for the finite element error control in computational partial differential *** the abstract setting of mixed formulations,a generalised formulation of the corresponding residuals is proposed which then allows for the unified estimation of the respective dual ***,this can be done with an approach which is applicable in the same way to conforming,nonconforming and mixed ***,the unified approach is applied to various model *** particular,we consider the laplace,Stokes,Navier-lamé,and the semi-discrete eddy current equations.

关键词： A posteriori error analysis finite element method nonconforming finite element method mixed finite element method adaptive algorithm Poisson equation laméequations Stokes equations Maxwell equations unified a posteriori error analysis discontinuous Galerkin residual estimator

Particles in a circulation loop for solar energy capture and storage

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Particuology 2019年第2期17卷 149-156页

作者： Q. Kang G. Flamant R. Dewil J. Baeyens h.l. Zhang Y.M. Deng KU leuven Department of Chemical Engineering Process and Environmental Technology Lab. 2860 Sint-Katelijne-Waver Belgium Processes. Materials and Solar Energy laboratory PROMES-CNRS 66120 Font Romeu France European Powder & Process Technology 3120 Tremelo Belgium Beijing University of Chemical Technology School of Life Science and Technology Beijing 10029 China

This study defines and assesses the selection ciiteria for suitable particulate materials to be used in an upflow bubbling fluidized bed (UBFB) or dense up-flow powder circulation system for solar energy capture and storage. The main criteria identified are based on the thermophysical and thermomechanical properties, attrition behavior, and the considerations of health and environmental hazards of the candidate powders. Finally, a cost comparison and tentative ranking of the different can didate powders is presented in addition to a weighted scoring. Significant scoring differences can be observed between the various materials. Olivine possesses the most favorable characteristics and appears to be the particulate material of choice for solid/gas suspension heat transfer fluids.

关键词： Concentrated solar power Particle-in-tube receiver Particle properties Selection criteria

eIF3 subunit M regulates blood meal digestion in Rhodnius prolixus affecting ecdysis, reproduction, and survival

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Insect Science 2023年第5期30卷 1282-1292页

作者： Pilar Ameijeiras Natalia Capriotti Sheila Ons Pedro l.Oliveira Marcos Sterkel laboratorio de Neurobiología de Insectos(lNI) Centro Regional de Estudios GenómicosFacultad de Ciencias ExactasUniversidad Nacional de La PlataCENEXACONICETLa PlataBuenos AiresArgentina Instituto de Bioquímica Médica leopoldo de Meis Universidade Federal do Rio de JaneiroRio de JaneiroBrazil Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular(INCT-EM) Rio de JaneiroBrazil

In triatomines,blood-feeding triggers many physiological processes including post embryonic development and *** feeding habits,such as hematophagy,can shape gene functions to meet the challenges of each type of *** gut of blood-sucking insects faces particular challenges after feeding due to the quantity and the quality of the food ingested.A comparison of transcriptomic and proteomic data indicates that post transcriptional regulation of gene expression is crucial in the triatomine *** was proposed that eukaryotic translation initiation factor 3 subunit m(eIF3m)and eIF3e define 2 different eIF3 complexes with a distinct affinity for the different mRNAs,thus selecting the set of mRNAs to be translated and constituting a post transcriptional mode of regulation of gene *** the eIF3m is mainly expressed in the gut,we evaluated its relevance in Rhodnius prolixus physiology through RNA interference-mediated gene *** knockdown of eIF3m reduced the digestion rate,affecting the processes triggered by a blood *** silencing inhibited molting and caused premature death in nymphs while impaired ovary development,oviposition and increased resistance to starvation in adult *** survival of males after feeding(resistance to starvation)was not affected by eIF3m *** information regarding the eIF3m function in insects is scarce and the phenotypes observed in *** upon eIF3m silencing are different and more severe than those previously described in Drosophila melanogaster,indicating a pleiotropic role of this gene in triatomines.

关键词： egg hatching hematophagous vectors lifespan oviposition post embryonic development starvation resistance

Productivity of well-watered Panicum virgatum does not increase with CO_(2) enrichment

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Journal of Plant Ecology 2012年第4期5卷 366-375页

作者： Philip A.Fay h.Wayne Polley Virginia l.Jin Michael J.Aspinwall USDA-ARS Grassland Soil and Water Research laboratory 808 E Blackland RdTempleTX 76502USA USDA-ARS Agroecosystem Management Research 137 Keim HallUniversity of Nebraska-LincolnLincolnNE 68583USA Section of Integrative Biology 1 University StationC0930University of Texas at AustinAustinTX 78712USA

Aims Rising atmospheric CO_(2) has been shown to increase aboveground net primary productivity(ANPP)in water-limited perennial grasslands,in part by reducing stomatal conductance and transpiration,thereby reducing depletion of soil ***,the benefits of CO_(2) enrichment for ANPP will vary with soil type and may be reduced if water limitation is *** is known about CO_(2) effects on ANPP of Panicum virgatum,a perennial C4 tallgrass and potential bioenergy *** hypothesized that if water limitation is minimized,(i)CO_(2) enrichment would not increase *** ANPP because photosynthetic rates of this C4 grass would not increase and because decreased transpiration at elevated CO_(2) would provide little additional benefit in increased soil moisture and(ii)soil type will have little effect on *** CO_(2) responses because of high overall soil *** Growth and leaf physiology of *** cv.‘Alamo’were studied as plants established for 4 years on silty clay and clay soils along a 250 to 500 ll l-1 gradient in atmospheric CO_(2) located in central Texas,*** were watered to replace evapotranspiration,fertilized with NO_(3)Nh_(4) and P_(2)O_(5) and clipped to standard height during *** Findings ANPP increased through the third year of *** moisture(0–20 cm),ANPP,tiller numbers and leaf area index were 8–18%higher on the clay than on the silty clay *** did not increase with CO_(2) except in the planting ***,biomass removed with clipping strongly increased with CO_(2) in years 2 and 3,suggesting that CO_(2) enrichment increased the early-to mid-season growth of establishing *** but not later regrowth or that of fully established ***,CO_(2) enrichment differentially affected two components of ANPP in years 2 and 3,increasing tiller mass and reducing tiller *** reallocation of resources in clipped *** suggested increased meristem limitation of productivi

关键词： switchgrass bioenergy resource allocation tillering meristem limitation