检索结果-南通市图书馆

Multimodal alarm behavior in urban and rural gray squirrels studied by means of observation and a mechanical robot

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2010年第3期56卷 313-326页

作者： sarah R.PARTAN Andrew G FULMeR Maya A.M.GOUNARD Jake e.ReDMOND Hampshire College School of Cognitive Science

Urbanization of animal habitats has the potential to affect the natural communication systems of any species able to survive in the changed environment. Urban animals such as squirrels use multiple signal channels to communicate, but it is un- known how ttrbanization has affected these behaviors. Multimodal commtmication, involving more than one sensory modality, can be studied by use of biomimetic mechanical animal models that are designed to simulate the multimodal signals and be pre- sented to animal subjects in the field. In this way the responses to the various signal components can be compared and contrasted to determine whether the multimodal signal is made up of redundant or nonredundant components. In this study, we presented wild gray squirrels in relatively urban and relatively rural habitats in Western Massachusetts with a biomimetic squirrel model that produced tail flags and alarm barks in a variety of combinations. We found that the squirrels responded to each unimodal component on its own, the bark and tail flag, but they responded most to the complete multimodal signal, containing both the acoustic and the moving visual components, providing evidence that in this context the signal components are redundant and that their combination elicits multimodal enhancement. We expanded on the results of Partan et al. （2009） by providing data on sig- naling behavior in the presence and absence of conspecifics, suggesting that alarm signaling is more likely if conspecifics are present. We found that the squirrels were more active in the urban habitats and that they responded more to tail flagging in the urban habitats as compared to the rural ones, suggesting the interesting possibility of a multimodal shift from reliance on audio to visual signals in noisier more crowded urban habitats [Current Zoology 56 （3）： 313-326, 2010].

关键词： Alarm behavior Communication Gray squirrel Sciurus carolinensis Multisensory signaling Redundancy Urbanization ethorobotics

The dawn and rise of antimony use in the southern Caucasus

在线全文

学校读者我要写书评

暂无评论

Science China earth Sciences 2022年第11期65卷 2037-2056页

作者： sarah DILLIS Patrick DeGRYSe Department of earth and environmental Sciences Katholieke Universiteit LeuvenCelestjnenlaan 200 EHeverlee 3001Belgium Faculty of Archaeology Leiden UniversityEinsteinweg 2Leiden 2333 CCThe Netherlands

Antimony(Sb)was utilised over several millennia as the prime material to opacify or decolour glass and glazes,as well as an accompanying element in copper(Cu)*** antimony objects are rare,and mostly confined to Chalcolithic Central Italy and to the first millennia BCe in the southern *** innovation of antimony use in metallurgy seems to be confined to the southern Caucasus,and the invention of it might be even more specifically situated in the Great *** knowledge of mining set the pathway for the initial stage of antimonial copper alloys in the first half of the third millennium BCe and for metallic antimony ornaments in the second half of the third millennium ***,the first major expansion of antimony in the metallurgy of the Racha-Lechkumi district in the southern Caucasus(present-day Georgia)started around 1700 BCe,while its spreading in glassmaking occurred in the Late Bronze Age(LBA).explanations that place antimony adoption within its broader social context are favoured over those that consider material or geological properties in isolation.A recurring theme is the importance of comparative analysis,both geographically and between the different pyrotechnologies,including the precious metals and glass industries,to explore how social,political,climatic and economic conditions affected adoption and innovation *** these factors are considered to explain why the extraction of antimony blossomed in the Late Bronze Age in the southern Caucasus and to reconstruct a framework of exploitation,distribution/trade and use of antimony in the Caucasus and its neighbouring regions in the south and east.

关键词： Antimony Caucasus Metallurgy Glass Gold

ecogeomorphic Feedbacks in Semiarid Rangelands:A Review

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2009年第2期19卷 217-229页

作者： I.STAVI H.LAVee e.D.UNGAR P.sarah Laboratory of Soil and Geomorphology Department of Geography and EnvironmentBar Ilan UniversityRamat Gan 52900(Israel) Department of Agronomy and Natural Resources Institute of Plant SciencesAgricultural Research Organizationthe Volcani CenterBet Dagan 50250(Israel)

The ecogeomorphic processes occurring on semiarid rangelands are reviewed, with emphasis on the source-sink relations and positive feedback loops that existed between shrub patches and intershrub areas, and the way livestock presence affected these interactions. Compared with intershrub areas, the shrub patches had a higher soil porosity, infiltration capacity, water-holding capacity, hydraulic conductivity, structural stability, and organic matter content, and lower bulk density. These differences derived from a host of processes whose intensity was less in the shrub patches, including raindrop impact, mechanical crust formation, overland water flow, soil erosion, evaporative moisture loss, and flock trampling. There was also greater shading of the soil surface; soil and litter deposition; water accumulation; microbial, fungal, and mesofaunal activities in the shrub patches. The overland flow of water carried soil and litter from the intershrub areas to the shrub patches and resulted in microtopographic modifications that tended to strengthen these source-sink relations. Grazing had an impact on these processes, not only at the shrub-intershrub scale but also within the intershrub areas, through the creation of highly compacted trampling routes. The combined role of the above ecogeomorphic processes was to maintain the rangeland＇s functionality. Without these inter-relationships, water loss, soil erosion, and nutrient depletion would occur at the hillside scale, causing degradation of the landscape.

关键词： intershrub areas shrubs soil resources trampling routes

Poor maternal nutrition inhibits muscle development in ovine offspring

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2015年第1期6卷 79-89页

作者： sarah A Reed Joseline S Raja Maria L Hoffman Steven A Zinn Kristen e Govoni Department of Animal Science University of ConnecticutStorrsCT 06269USA

Background： Maternal over and restricted nutrition has negative consequences on the muscle of offspring by reducing muscle fiber number and altering regulators of muscle growth. To determine if over and restricted maternal nutrition affected muscle growth and gene fed 60%, 100% or 140% of National Research Council and protein expression in offspring, 36 pregnant ewes were requirements from d 31 ＋ 1,3 of gestation until parturition. Lambs from control-fed （CON）, restricted-fed （ReS） or over-fed （OVeR） ewes were necropsied within 1 d of birth （n = 18） or maintained on a control diet for 3 mo （n = ] 5）. Semitendinosus muscle was collected for immunohistochemistry, and protein and gene expression analysis. Results： Compared with CON, muscle fiber cross-sectional area （CSA） increased in ReS （58%） and OVeR （47%） lambs at 1 d of age （P〈 0.01）; however at 3 mo, CSA decreased 15% and 17% compared with CON, respectively （P 〈 0.01）. Compared with CON, muscle lipid content was increased in OVeR （212.4%） and ReS （92.5%） at d 1 （P 〈 0.0001）. Muscle lipid content was increased 36.1% in OVeR and decreased 23.6% in ReS compared with CON at 3 mo （P 〈 0.0001）. At d 1, myostatin mRNA abundance in whole muscle tended to be greater in OVeR （P = 0.07） than CON. Follistatin mRNA abundance increased in OVeR （P = 0.04） and tended to increase in ReS （P = 0.06） compared with CON at d 1. However, there was no difference in myostatin or follistatin protein expression （P 〉 0.3）. Phosphorylated Akt （ser473） was increased in ReS at 3 mo compared with CON （P = 0.006）. Conclusions： In conclusion, maternal over and restricted nutrient intake alters muscle lipid content and growth of offspring, possibly through altered gene and protein expression.

关键词： Growth Maternal nutrition Muscle development Sheep

Inscribing the core memories of killers

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2019年第2期16卷 104-105页

作者： sarah J.Dulson Laurie e.Harrington Allan J.Zajac Department of Cell Developmentaland Integrative BiologyUniversity of Alabama at BirminghamBirminghamAL 35294United States Department of Microbiology University of Alabama at BirminghamBirminghamAL 35294United States

Recent studies on natural killer(NK)cells have challenged the dogma that immunological memory is a phenomenon restricted to the adaptive immune *** interactions between the NK cell receptor Ly49H and the murine cytomegalovirus virus(MCMV)-encoded glycoprotein m157 result in selective expansion of the Ly49H+NK cell subpopulation and the establishment of a long-lived memory-like population.1–3 Further,memory NK cells show augmented IFNγresponses,and transfer of the memory population into naive mice confers enhanced protection against infection-induced mortality.1 These observations along with cytotoxicity and cytokine secretion functions that overlap with CD8 T cells have led to the description of NK cells as a bridge between the innate and adaptive immune systems.

关键词： killer mortality cytotoxicity

Long-term physical,mental and social health effects of COVID-19 in the pediatric population:a scoping review

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2022年第3期18卷 149-159页

作者： Madeline Borel Luyu Xie Olivia Kapera Adrian Mihalcea Jeffrey Kahn sarah e.Messiah School of Public Health University of Texas Health Science CenterDallas Campus2777 N Stemmons FwyDallasTX 75207USA Center for Pediatric Population Health University of Texas Health School of Public Health and Children’s Health System of TexasDallasTXUSA School of Public Health University of Texas Health Science CenterAustin CampusAustinTXUSA School of Public Health University of Texas Health Science CenterHouston CampusHoustonTXUSA Department of Pediatrics University of Texas Southwestern Medical CenterDallasTXUSA Children’s Health System of Texas DallasTXUSA

Background The majority of coronavirus disease 2019(COVID-19)symptom presentations in adults and children appear to run their course within a couple of ***,a subgroup of adults has started to emerge with effects lasting several months or more after initial infection,which raises questions about the long-term physical,mental and social health effects of COVID-19 in the pediatric *** purpose of this review was to determine these impacts well into the second year of the *** A search was conducted using PubMed,Web of Science,Science Direct,and Cochrane between 11/1/2019 and 9/1/*** inclusion criteria were as follows:(1)COVID-19 illness and symptoms in children;(2)severe acute respiratory syndrome coronavirus 2 in children;(3)english language;and(4)human studies *** The few studies that have documented long-term physical symptoms in children show that fatigue,difficulty in concentrating(brain fog),sleep disturbances,and sensory problems are the most reported *** studies examining the impact of COVID-19 in pediatric populations have focused on initial clinical presentation,and symptoms,which are similar to those in adult *** addition,COVID-19 has had a moderate impact on children and adolescents’social environment,which may exacerbate current and future physiological,psychological,behavioral,and academic *** There are limited studies reporting long physical symptoms of COVID-19 in the pediatric ***,pediatric COVID-19 cases are underreported due to low rates of testing and symptomatic infection,which calls for more longitudinal *** who have experienced COVID-19 illness should be monitored for long physiological,psychological,behavioral,and academic outcomes.

关键词： Adolescents Children Coronavirus disease 2019(COVID-19) Long-COVID symptoms

Importance of adapted digestion conditions to simulate in vitro lipid digestion of broilers in different life stages

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2023年第1期12卷 151-158页

作者： Daphne Michels sarah H.e.Verkempinck Agnese Panozzo Karen Vermeulen Marc e.Hendrickx Liesbet Thijs Tara Grauwet Laboratory of Food Technology and Leuven Food Science and Nutrition Research Centre(LFoRCe) Department of Microbial and Molecular Systems(M2S)KU LeuvenLeuven3001Belgium Kemin Animal Nutrition and Health Kemin Europa N.V.Herentals2200Belgium

In vitro digestion studies demonstrate large potential to gain more and quicker insights into the underlying mechanisms of feed additives,allowing the optimization of feed ***,current in vitro digestion models relevant for broiler chickens lack sufficient description in terms of protocols and standardisation ***,no distinction is made between the different life phases of these animals(starter,grower,and finisher).Hence,our research aimed to establish adapted in vitro digestion conditions,corresponding to the 3 life phases in broilers,with specific focus on lipid *** effect of 3 different bile salt concentrations of 2,10,and 20 mM,and 3 different lipase activities of 5,20,and 100 U/mL,on in vitro lipid digestion kinetics were evaluated using a full factorial *** values were selected to represent starter,grower,and finisher birds,*** findings showed that the extent of lipid digestion was mainly influenced by lipase *** rate of lipid digestion was affected by an interplay between bile salt concentration and lipase activity,due to possible lipase inhibition at certain bile salt ***,this work resulted in 3 in vitro lipid digestion models representative for starter,grower,and finisher *** conclusion,this research showed the impact of adapted in vitro digestion conditions on lipid digestion kinetics and thus the need for these conditions relevant for each life phase of broilers.

关键词： Lipolysis Lipase activity Bile salt In vitro digestion Broiler chicken emulsion

Retinoid X receptor α downregulation is required for tail and caudal spinal cord regeneration in the adult newt

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第6期13卷 1036-1045页

作者： sarah e.Walker Rachel Nottrodt Lucas Maddalena Christopher Carter Gaynor e.Spencer Robert L.Carlone Department of Biological Sciences Brock University Department of Geosciences University of Calgary Biomedical Sciences Cambridge University Pre-Health Sciences Department Niagara College

Some adult vertebrate species,such as newts,axolotls and zebrafish,have the ability to regenerate their central nervous system（CNS）.However,the factors that establish a permissive CNS environment for correct morphological and functional regeneration in these species are not well *** evidence supports a role for retinoid signaling in the intrinsic ability of neurons,in these regeneration-competent species,to regrow after CNS ***,we demonstrated that a specific retinoic acid receptor（RAR）subtype,RARβ,mediates the effects of endogenous retinoic acid（RA）on neuronal growth and guidance in the adult newt CNS after ***,we now examine the expression of the retinoid X receptor RXRα（a potential heterodimeric transcriptional regulator with RARβ）,in newt tail and spinal cord *** show that at 21 days post-amputation（dpa）,RXRαis expressed at temporally distinct periods and in non-overlapping spatial domains compared to RARβ.Whereas RARβprotein levels increase,RXRαproteins level decrease by 21 dpa.A selective agonist for RXR,SR11237,prevents both this downregulation of RXRαand upregulation of RARβand inhibits tail and caudal spinal cord ***,treatment with a selective antagonist for RARβ,Le135,inhibits regeneration with the same morphological consequences as treatment with ***,Le135 treatment also inhibits the normal downregulation of RXRαin tail and spinal cord tissues at 21 *** results reveal a previously unidentified,indirect regulatory feedback loop between these two receptor subtypes in regulating the regeneration of tail and spinal cord tissues in this regeneration-competent newt.

关键词： retinoid X receptor spinal cord regeneration newt retinoic acid ependymoglia retinoic acid receptor

What is artificial meat and what does it mean for the future of the meat industry?

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第2期14卷 255-263页

作者： sarah P F Bonny Graham e Gardner David W Pethick Jean-Franois Hocquette School of Veterinary and Life Sciences Murdoch UniversityMurdoch W.A. 6150 Australia INRA UMR1213 Recherches sur les HerbivoresSaint-Genès Champanelle F-63122 France Clermont Université Vet Agro Sup UMR1213 Recherches sur les HerbivoresSaint-Genès Champanelle F-63122 France

The meat industry cannot respond to increases in demand by ever increasing resource use. The industry must find solutions to issues regarding animal welfare, health and sustainability and will have to do so in the face of competition from emerging non-traditional meat and protein products in an increasingly complex regulatory environment. These novel meat and protein products, otherwise known as ‘artificial meat＇ are utilising ground breaking technologies designed to meet the issues facing the conventional meat industry. These artificial meats, in vitro or cultured meat and meat from genetically modified organisms have no real capacity to compete with conventional meat production in the present environment. However, meat replacements manufactured from plant proteins and mycoproteins are currently the biggest competitors and are gaining a small percentage of the market. Manufactured meats may push conventional meat into the premium end of the market, and supply the bulk, cheap end of the market if conventional meat products become more expensive and the palatability and versatility of manufactured meats improve. In time the technology for other artificial meats such as meat from genetic modified organisms or cultured meat may become sufficiently developed for these products to enter the market with no complexity of the competition between meat products. Conventional meat producers can assimilate agroecology ecology concepts in order to develop sustainable animal production systems. The conventional meat industry can also benefit from assimilating biotechnologies such as cloning and genetic modification technologies, using the technology to adapt to the changing environment and respond to the increasing competition from artificial meats. Although it will depend at least partly on the evolution of conventional meat production, the future of artificial meat produced from stem cells appears uncertain at this time.

关键词： artificial meat in vitro meat meat industry consumer satisfaction sustainable production