Search results for "PTE"
showing 10 items of 2238 documents
TLR7 controls VSV replication in CD169(+) SCS macrophages and associated viral neuroinvasion
2019
Vesicular stomatitis virus (VSV) is an insect-transmitted rhabdovirus that is neurovirulent in mice. Upon peripheral VSV infection, CD169+ subcapsular sinus (SCS) macrophages capture VSV in the lymph, support viral replication, and prevent CNS neuroinvasion. To date, the precise mechanisms controlling VSV infection in SCS macrophages remain incompletely understood. Here, we show that Toll-like receptor-7 (TLR7), the main sensing receptor for VSV, is central in controlling lymph-borne VSV infection. Following VSV skin infection, TLR7−/− mice display significantly less VSV titers in the draining lymph nodes (dLN) and viral replication is attenuated in SCS macrophages. In contrast to effects o…
Does Holistic Processing Require a Large Brain? Insights From Honeybees and Wasps in Fine Visual Recognition Tasks
2018
The expertise of humans for recognizing faces is largely based on holistic processing mechanism, a sophisticated cognitive process that develops with visual experience. The various visual features of a face are thus glued together and treated by the brain as a unique stimulus, facilitating robust recognition. Holistic processing is known to facilitate fine discrimination of highly similar visual stimuli, and involves specialized brain areas in humans and other primates. Although holistic processing is most typically employed with face stimuli, subjects can also learn to apply similar image analysis mechanisms when gaining expertise in discriminating novel visual objects, like becoming exper…
Parasite presence induces gene expression changes in an ant host related to immunity and longevity
2021
Most species are either parasites or exploited by parasites, making parasite&ndash
Traditional and experimental floating fish aggregating devices in the Gulf of Castellammare (NW Sicily): Results from catches and visual observations
1999
Floating fish aggregating devices (FADs) have long been used to attract fish in NW Sicily since antiquity. Recently, a number of changes have been made to the type of material employed to construct FADs, with the aim of increasing their effectiveness. In this paper we compare the catches made at eight experimental floating FADs (polypropylene ropes frayed at the ends) with those obtained at eight traditional FADs in the Gulf of Castellammare. A total of 672 samples were collected during summer and autumn in 1995 and 1996 at the 16 FADs using a surrounding net. Visual observations of fishes associated with the FADs were also conducted to obtain qualitative information about the spatial distr…
New Mediterranean Marine biodiversity records (December, 2013)
2013
M. Bilecenoglu [et al.]
Solving a Bloody Mess: B-Vitamin Independent Metabolic Convergence among Gammaproteobacterial Obligate Endosymbionts from Blood-Feeding Arthropods an…
2015
Endosymbiosis is a common phenomenon in nature, especially between bacteria and insects, whose typically unbalanced diets are usually complemented by their obligate endosymbionts. While much interest and focus has been directed toward phloem-feeders like aphids and mealybugs, blood-feeders such as the Lone star tick (Amblyomma americanum), Glossina flies, and the human body louse (Pediculus humanus corporis) depend on obligate endosymbionts which complement their B-vitamin-deficient diets, and thus are required for growth and survival. Glossiphoniid leeches have also been found to harbor distinct endosymbionts housed in specialized organs. Here, we present the genome of the bacterial endosy…
Lidaparātu trajektoriju konstruēšana balstoties uz Bezjē līknēm
2015
Pēdējos gados ļoti strauji attīstās tāda robotikas nozare, kā visu veidu lidojošie droni: kvadro- kopteri, oktakoperi u.t.t. Tehnoloģiju attīstības dēļ palika reāla autonomo dronu realizācija un sāka parādīties daži veidi, kā izmantot dronus. Darbā tiek izstrādāts autonomā kvadrokoptera trajektorijas konstruēšanas algoritms, balstoties uz Bezjē līknēm. Tiek apskatīts iepriekš izman- totais algoritms, tā trūkumi un priekšrocības. Izstrādātais algoritms tika implementēts Latvijas izstrādātajā dronā ”AirDog” un salīdzināti vecā un jaunā algoritma darbības rezultāti dažādos apstākļos.
Difficulty of getting accurate and precise estimates of population size: The case of the Siberian flying squirrel in Finland
2008
Accurate estimates of population size and distribution are a prerequisite for effective management of populations, but for most species a reliable estimation of the absolute population size is very difficult. In 1998, the Finnish Ministry of Environment set up a working group to plan a national-level survey for estimation and monitoring of the population size of Siberian flying squirrel (Pteromys volans). In 2006, the population size was reported to be 143 000 females. However, evaluation of the magnitude of possible biases was not attempted. Our aim was to test the population size estimate by conducting a resampling study with the methods of the national survey on an eartagged population o…
Recent changes in chironomid communities and hypolimnetic oxygen conditions relate to organic carbon in subarctic ecotonal lakes
2018
A key question in aquatic elemental cycling is related to the influence of bottom water oxygen conditions in regulating the burial and release of carbon under climate warming. In this study, we used head capsules of Chironomidae larvae to assess community and diversity change between the past (estimated as Pre-Industrial Period) and present and to reconstruct changes in hypolimnetic oxygen conditions from 30 subarctic ecotonal lakes (northeastern Lapland) using the top-bottom paleolimnological approach applying surface sediment (topmost 0-2 cm) and reference (4-5 cm) samples. Subsequently, we tested the findings against dissolved organic carbon (DOC) concentration of the sites. We found tha…
Des saveurs aux récepteurs : une histoire de goût
2015
Journal AFDIAG Infos = Magazine d’informations trimestriel de l'Association qui paraît 4 fois par an.Les publications sont réservées aux adhérents de l’AFDIAG et aux médecins.; De nombreux sens régissent notre comportement alimentaire. Parmi eux, la gustation joue un rôle déterminant pour orienter nos choix culinaires. Le sens du goût nous est familier et pourtant, il constitue un des sens les plus complexes. Depuis une dizaine d’années néanmoins, de notables progrès ont été réalisés dans sa connaissance, depuis la découverte des récepteurs gustatifs jusqu’à l’identification des gènes responsables de nos différences de préférences gustatives.