检索结果-南通市图书馆

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

动物逆化论野性生存都市法则

摄影之友 2014年第12期 52-53页

作者： simen johan Clarisse Rebotier Thomas Subtil Samuel Guigues Nick Brandt 三木元武陈洋

在这个时代,再也找不到人与动物共同相处的契合点,动物被迫迁徙,在人类的土地上寻找最后一片净土。本期品色专辑将通过四组作品来诠释一个动物生态的逆进化论,从它们在土地上自由生活的原始状态,到它们在都市繁华间的生存尝试,再到它们... 详细信息

在这个时代,再也找不到人与动物共同相处的契合点,动物被迫迁徙,在人类的土地上寻找最后一片净土。本期品色专辑将通过四组作品来诠释一个动物生态的逆进化论,从它们在土地上自由生活的原始状态,到它们在都市繁华间的生存尝试,再到它们闯入黑暗人间都市的迷茫最终它们仍然改变不了人类对它们的肆意屠杀。我们希望通过影像,来诠释一个哀歌式的动物生存递进关系。

关键词：最后一片净土逆进化品色递进关系

A Time to Remember:Neural Insights into Rapid Updating of Timed Behaviors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2023年第4期39卷 699-702页

作者： Christopher Howard Patrick simen Neuroscience Department Oberlin CollegeOberlinOH44074USA

Processing temporal information is a critical brain function necessary for decision-making and *** timing,or processing of time intervals on the scale of seconds to minutes,is essential for associative learning,sensorimotor processing,and optimal foraging[1]and many neuropsychiatric illnesses including Parkinson's Disease,Huntington's Disease,and schizophrenia involve impaired interval timing.

关键词： Huntington impaired dating

Mapping and understanding degradation of alpine wetlands in the northern Maloti-Drakensberg, southern Africa

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第9期21卷 2956-2966页

作者： johan van TOL Department of Soil Crop and Climate SciencesUniversity of the Free StateBloemfontein 9300South Africa

The alpine terrestrials of the Maloti-Drakensberg in southern Africa play crucial roles in ecosystem functions and livelihoods,yet they face escalating degradation from various factors including overgrazing and climate *** study employs advanced Digital Soil Mapping(DSM)techniques coupled with remote sensing to map and assess wetland coverage and degradation in the northern *** model achieved high accuracies of 96%and 92%for training and validation data,respectively,with Kappa statistics of 0.91 and 0.83,marking a pioneering automated attempt at wetland mapping in this *** attributes such as terrain wetness index(TWI)and valley depth(VD)exhibit significant positive correlations with wetland coverage and erosion gully density,Channel Network Depth and slope were negative *** density analysis revealed terrain attributes as dominant factors driving degradation,highlighting the need to consider catchment-specific susceptibility to *** challenge traditional assumptions which mainly attribute wetland degradation to external forces such as livestock overgrazing,ice rate activity and climate *** sensitivity map produced could serve as a basis for Integrated Catchment Management(ICM)projects,facilitating tailored conservation *** research should expand on this work to include other highland areas,explore additional covariates,and categorize wetlands based on hydroperiod and sensitivity to *** comprehensive study underscores the potential of DSM and remote sensing in accurately assessing and managing wetland ecosystems,crucial for sustainable resource management in alpine regions.

关键词： Digital Soil Mapping Gully density Integrated catchment management Remote sensing Wetland degradation

The origin of the suspended particulate matter in the seagrass meadow of tropical waters, an evidence of the stable isotope signatures

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2019年第1期38卷 136-143页

作者： A'an johan Wahyudi Afdal Research Center for Oceanography Indonesian Institute of Sciences

Suspended particulate matter(SPM) has been known as an important variable in the organic matter flow of coastal ecosystem. Half of burial carbon in seagrass meadows is contributed by allochthonous sources that compose the SPM such as phytoplankton, seagrass detritus, marine snow aggregates and terrestrially derived particles. Each composition of the SPM contributes different roles and is important to be identified, for instance,the exact contribution of seagrass detritus will be useful for determination of carbon export through the detritus form in seagrass meadows. Here, the SPM of seagrass meadows is studied in Bintan Island and the Selayar Archipelago. The aim of this research is to determine the source origin of the SPM using a stable isotope *** order to fulfill this aim, the objectives are defined as:(1) to specify the stable isotope signature(δ13C and δ15N)of the SPM, and(2) to determine the proportional distribution of the SPM's prospectus sources. The result shows that the possibility of the source origin of the SPM includes a seagrass fraction(Enhalus acoroides and Thalassia hemprichii), terrestrial C4 plant, macroalgae, and terrestrial C3 plant. The SPM lies between the marine-and terrigenous-end members. However, it seems that the SPM is more to be terrigenous-end and *** to a Bayesian mixing model, the terrestrial C4 has the highest contribution of the SPM at all sites except Barugaia and Pasi Island in Selayar(i.e., the highest contribution of the SPM is from the detritus of E. acoroides).The second contribution has been contributed by either seagrass detritus(E. acoroides or Th. hemprichii) or terrestrial C3 plant. The finding of this study indicates that there is a strong influence of the terrigenous sources in the SPM of the seagrass meadows.

关键词： suspended particulate matter stable isotope source origin seagrass ecosystems

Gut health,stress,and immunity in neonatal dairy calves:the host side of host-pathogen interactions

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2021年第1期12卷 49-63页

作者： johan.S.Osorio Dairy and Food Science Department South Dakota State University113 H Alfred Dairy Science HallBrookingsSD 57007USA

The cumulative evidence that perinatal events have long-lasting ripple effects through the life of livestock animals should impact future nutritional and management recommendations at the farm level. The implications of fetal programming due to malnutrition, including neonatal survival and lower birth weights, have been characterized,particularly during early and mid-gestation, when placental and early fetal stages are being developed. The accelerated fetal growth during late pregnancy has been known for some time, while the impact of maternal stressors during this time on fetal development and by extent its postnatal repercussions on health and performance are still being *** stressors during late pregnancy cannot only influence colostrogenesis but also compromise adequate intestinal development in the fetus, thus, that further limits the newborn's ability to absorb nutrients, bioactive compounds, and immunity(i.e., immunoglobulins, cytokines, and immune cells) from colostrum. These negative effects set the newborn calf to a challenging start in life by compromising passive immunity and intestinal maturation needed to establish a mature postnatal mucosal immune system while needing to digest and absorb nutrients in milk or milk replacer. Besides the dense-nutrient content and immunity in colostrum, it contains bioactive compounds such as growth factors, hormones, and cholesterol as well as molecular signals or instructions [e.g., microRNAs(miRNAs) and long non-coding RNAs(lncRNAs)] transferred from mother to offspring with the aim to influence postnatal gut maturation. The recent change in paradigm regarding prenatal materno-fetal microbiota inoculation and likely the presence of microbiota in the developing fetus intestine needs to be addressed in future research in ruminants. There still much to know on what prenatal or postnatal factors may predispose neonates to become susceptible to enteropathogens(e.g., enterotoxigenic Escherichia coli), causing

关键词： Dairy calves Fecal RNA Neonatal diarrhea

Effects of local vegetation and plantation age for the parasitoid Asecodes mento- a biocontrol agent in organic strawberry fields

在线全文

学校读者我要写书评

暂无评论

Insect Science 2012年第5期19卷 604-608页

作者： johan A. Stenberg Department of Ecology Swedish University of Agricultural Sciences Uppsala Sweden

The parasitoid Asecodes mento （Walker, 1839）（Hymenoptera： Eulophidae） is the most important biocontrol agent of the strawberry leaf beetle Galerucella tenella （L.）（Coleoptera： Chrysomelidae） in northern Europe. Here, I investigated whether natural parasitism in organic strawberry plantations was affected by the presence of the alternative host plant meadowsweet （Filipendula ulmaria）, and whether parasitism rates differed between plantations of different ages （6 to 79 years）. I also investigated whether parasitoid brood size, body size and sex ratio differed between the two host plants in the field. Parasitism was very low （0%） in newly established plantations and increased to a plateau （~40%） in fields where strawberries had been grown for approximately 20 years or longer. Such an extended colonization process is unacceptable for commercial growers. It would thus be desirable to find a method to catalyze parasitoid population buildup in young plantations. Parasitoid brood sizes were larger in beetles collected from meadowsweet, while body size and sex ratio did not differ between parasitoids collected from the two plants. These findings suggest that meadowsweet can export parasitoids to neighboring strawberry fields. Although this is a possibility, I did not find any significant differences in parasitism rates between isolated strawberry fields and fields adjacent to meadowsweet stands, indicating that effects of local vegetation are small on parasitism rates. Releasing parasitoids in newly established strawberry plantations may be a better strategy for quickly obtaining high parasitism than intercropping with meadowsweet.

关键词： Asecodes mento biocontrol biological control Fragaria x ananassa,Galerucella tenella landscape ecology

Vole preference of bilberry along gradients of simulated moose density and site productivity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2011年第4期6卷 341-351页

作者： simen PEDERSEN Harry P.ANDREASSEN Inga-Lill PERSSON Riitta JULKUNEN-TIITTO Kjell DANELL Christina SKARPE Department of Forestry and Wildlife Management Hedmark University CollegeKoppangNorway Department of Biology Norwegian University of Science and TechnologyTrondheimNorway Department of Wildlife Fish and Environmental StudiesSwedish University of Agricultural SciencesUmeåSweden Department of Biology University of Eastern FinlandJoensuuFinland

Browsing by large herbivores might either increase or decrease preference for the plant by other herbivores,depending on the plant *** a cafeteria test,we studied the preference by root voles(Microtus oeconomus[Pallas,1776])for bilberry(Vaccinium myrtillus L.)previously subjected to 4 levels of simulated moose(Alces alces[Linnaeus,1758])*** different levels of moose density were simulated at population densities relevant for Fennoscandian conditions,in exclosures situated along a site productivity *** expected:(i)voles to prefer bilberry from high productivity sites over low productivity sites;(ii)voles to prefer browsed bilberry,if plants allocate resources to compensatory growth or to avoid browsed bilberry if plants allocate resources to defense;(iii)these effects to increase with increasing simulated moose density;and(iv)the concentration of plant chemicals and the plant morphology to explain vole ***,we predicted that voles would prefer:(i)plants with high nitrogen content;(ii)plants with low content of defensive substances;and(iii)tall plants with long *** preferred bilberry from the high productivity sites compared to the low productivity *** also found an interaction between site productivity and simulated moose density,where voles preferred unbrowsed plants at low productivity sites and intermediate levels of browsing at high productivity *** was no effect of plant chemistry or morphology on vole *** conclude that moose browsing impacts the food preference of *** the current high densities of moose in Fennoscandia,this could potentially influence vole food selection and population dynamics over large geographical areas.

关键词： browsing cervid herbivory induced defense Microtus

Exhuming the Meso-Cenozoic Kyrgyz Tianshan and Siberian Altai-Sayan:A review based on low-temperature thermochronology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2016年第2期7卷 155-170页

作者： Stijn Glorie johan De Grave Centre for Tectonics Resources and Exploration(TRaX)Department of Earth SciencesSchool of Physical SciencesThe University of Adelaide Dept.Geology & Soil Science MINPET GroupGhent University

Thermochronological datasets for the Kyrgyz Tianshan and Siberian Altai-Sayan within Central Asia reveal a punctuated exhumation history during the Meso-Cenozoic. In this paper, the datasets for both regions are collectively reviewed in order to speculate on the links between the Meso-Cenozoic exhumation of the continental Eurasian interior and the prevailing tectonic processes at the plate margins. Whereas most of the thermochronological data across both regions document late Jurassic -Cretaceous regional basement cooling, older landscape relics and dissecting fault zones throughout both regions preserve Triassic and Cenozoic events of rapid cooling, respectively. Triassic cooling is thought to reflect the Qiangtang-Eurasia collision and/or rifting/subsidence in the West Siberian basin. Alternatively, this cooling signal could be related with the terminal terrane-amalgamation of the Central Asian Orogenic Belt. For the Kygyz Tianshan, late Jurassic-Cretaceous regional exhumation and Cenozoic fault reactivations can be linked with specific tectonic events during the closure of the Palaeo-Tethys and Neo-Tethys Oceans, respectively. The effect of the progressive consumption of these oceans and the associated collisions of Cimmeria and India with Eurasia probably only had a minor effect on the exhumation of the Siberian Altai-Sayan. More likely, tectonic forces from the east （present-day co- ordinates） as a result of the building and collapse of the Mongol-Okhotsk orogen and rifting in the Baikal region shaped the current Siberian Altai-Sayan topography. Although many of these hypothesised links need to be tested further, they allow a first-order insight into the dynamic response and the stress propagation pathways from the Eurasian margin into the continental interior.

关键词： Central Asia Tianshan Altai Sayan Thermochronology Exhumation Fault reactivation

Classification of Flat Lagrangian Surfaces in Complex Lorentzian Plane

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第12期23卷 2111-2144页

作者： Bang-Yen CHEN johan FASTENAKELS Department of Mathematics Michigan State University East Lansing MI 48824-1027 USA Departement Wiskunde Katholieke Universiteit Leuven Celestijnenlaan 200B B-3001 Leuven Belgium

One of the most fundamental problems in the study of Lagrangian submanifolds from Riemannian geometric point of view is to classify Lagrangian immersions of real space forms into complex space forms. The main purpose of this paper is thus to classify flat Lagrangian surfaces in the Lorentzian complex plane C1^2. Our main result states that there are thirty-eight families of flat Lagrangian surfaces in C1^2. Conversely, every flat Lagrangian surface in C1^2 is locally congruent to one of the thirty-eight families.

关键词： flat Lagrangian surfaces Lorentzian complex plane Legendre curve