Search results for "Na-v"
showing 10 items of 11 documents
Integrative taxonomy resolves species identities within the Macrobiotus pallarii complex (Eutardigrada: Macrobiotidae)
2021
AbstractThe taxonomy of many groups of meiofauna is challenging due to their low number of diagnostic morphological characters and their small body size. Therefore, with the advent of molecular techniques that provide a new source of traits, many cryptic species have started to be discovered. Tardigrades are not an exception, and many once thought to be cosmopolitan taxa are being found to be complexes of phenotypically similar species. Macrobiotus pallarii Maucci, 1954 was originally described in South Italy and has been subsequently recorded in Europe, America, and Asia. This allegedly wide geographic range suggests that multiple species may be hidden under this name. Moreover, recently, …
DNA barcoding reveals different cestode helminth species in northern European marine and freshwater ringed seals
2021
Three subspecies of the ringed seal (Pusa hispida) are found in northeastern Europe: P. h. botnica in the Baltic Sea, P. h saimensis in Lake Saimaa in Finland, and P. h. ladogensis in Lake Ladoga in Russia. We investigated the poorly-known cestode helminth communities of these closely related but ecologically divergent subspecies using COI barcode data. Our results show that, while cestodes from the Baltic Sea represent Schistocephalus solidus, all worms from the two lakes are identified as Ligula intestinalis, a species that has previously not been reported from seals. The observed shift in cestode communities appears to be driven by differential availability of intermediate fish host spec…
Lapsu (Vulpes vulpes) un jenotsuņu (Nyctereutes procyonoides) endoparazītu daudzveidība Latvijā
2020
Latvijā ir maz veikti pētījumi par savvaļas zīdītāju endoparazītu daaudzveidību. Šī pētījuma mērķis ir noteikt rudo lapsu (Vulpes vulpes) un jenotsuņu (Nyctereutes procyonoides) endoparazītu sastopamību un daudzveidību Latvijā laika posmā no 2012./2013. līdz 2015./2016. gadam. Pētījuma gaitā tika konstatēts, ka visizplatītākie endoparazīti rudām lapsām ir Alaria alata (94,2%) un jenotsuņiem Uncinaria stenocephala (93,7 %). Analizējot parazītu sugu savstarpējās asociācijas ciešumu, tika noteikts ka starp rudo lapsu plaušu nematožu sugām Crenosoma vulpis un Eucoleus aerophilus pastāv vidēji cieša asociācija, kurai ir potenciāli pozitīva tendence. Tika konstatēts, ka rudo lapsu parazitofaunas …
Neutriinojen sekoitusmatriisin Majorana-vaiheet
2013
Lukuisat hiukkasfysiikan kokeet ovat vahvistaneet neutriinojen olevan massallisia hiukkasia ja kykenevän muuttumaan neutriinotyypistä toiseen. Tätä niin kutsuttua neutriino-oskillaatiota parametrisoi neutriinojen sekoitusmatriisi, jota puolestaan parametrisoi kolmen sekoituskulman lisäksi yksi tai kolme CP-symmetriaa rikkovaa vaihetta riippuen siitä ovatko neutriinot Dirac- tai Majorana-hiukkasia. Tässä työssä tarkasteltiin edellä mainittujen Dirac- ja Majorana-vaiheiden merkitystä neutriino-oskillaatioissa, neutriinonottomassa kaksoisbeetahajoamisessa, Higgsin triplettimallissa ja baryoniepäsymmetrian synnyttäneessä leptonigeneesissä. Neutriino-oskillaation tarkastelua varten johdettiin ne…
Older adults’ activity destinations before and during COVID-19 restrictions: From a variety of activities to mostly physical exercise close to home
2021
The aim was to study various types of older adult's activity destinations (counts, frequency of visitation, and distance from home) in the pre-COVID-19 era, and to study prospectively how COVID-19-related regulations limiting mobility affected these. Using a map-based questionnaire, 75-85-year-old participants reported activity destinations, that is, any destinations for physical exercise, destinations facilitating one's outdoor mobility, and destinations for other activities, which they had visited several times during the past month. At baseline, a variety of activity destinations was reported, but during COVID-19, destinations reported markedly declined in number, they were reported pred…
Sodium channels enable fast electrical signaling and regulate phagocytosis in the retinal pigment epithelium
2019
Background Voltage-gated sodium (Nav) channels have traditionally been considered a trademark of excitable cells. However, recent studies have shown the presence of Nav channels in several non-excitable cells, such as astrocytes and macrophages, demonstrating that the roles of these channels are more diverse than was previously thought. Despite the earlier discoveries, the presence of Nav channel-mediated currents in the cells of retinal pigment epithelium (RPE) has been dismissed as a cell culture artifact. We challenge this notion by investigating the presence and possible role of Nav channels in RPE both ex vivo and in vitro. Results Our work demonstrates that several subtypes of Nav cha…
Etude de certaines familles de variétés algébriques munies d'une action de groupe algébrique
2021
Desiccation risk favours prevalence and diversity of tardigrade communities and influences their trophic structure in alpine ephemeral rock pools
2022
AbstractRock pools are ephemeral freshwater habitats characterized by their small size, well-defined boundaries, and periodic desiccation, making them ideal model systems to answer numerous ecological questions. Although there are numerous studies on rock pool fauna around the world, tardigrades have only rarely been recorded. We conducted the first tardigrade-focused study on rock pools by quantitatively extracting and classifying them from rock pools in the Italian Apennines. Rock pools were divided into three types, based on maximum duration of their inundation period. Following the patterns usually observed with rock pool invertebrates, we tested the hypothesis that desiccation has a ne…
UV-B exposure causes DNA damage and changes in protein expression in northern pike (Esox lucius) posthatched embryos.
2012
The ongoing anthropogenically caused ozone depletion and climate change has increased the amount of biologically harmful UV-B radiation, which is detrimental to fish in embryonal stages. The effects of UV-B radiation on the levels and locations of DNA damage manifested as cyclobutane pyrimidine dimers (CPDs), heat shock protein 70 (HSP70) and p53 protein in newly hatched embryos of pike were examined. Pike larvae were exposed in the laboratory to current and enhanced doses of UV-B radiation. UV-B exposure caused the formation of CPDs in a fluence rate-dependent manner, and the CPDs were found deeper in the tissues with increasing fluence rates. UV-B radiation induced HSP70 in epidermis, and…
Pathogenesis and autoimmunity initiated by a viral protein-induced apoptotic bodies
2016
Ihmisen parvovirus B19 (B19) on laajalle levinnyt, yleinen virus, joka aiheuttaa lapsissa parvorokkoa (viides tauti). Aikuisille B19 aiheuttaa erinäisiä sairauksia, muun muassa nivelkipuja ja – tulehdusta, anemiaa, sekä raskaana oleville sikiöpöhöä. Lisäksi B19 infektio saattaa johtaa autoimmuunisairauksiin, kuten punahukkaan (systemic lupus erythematosus, SLE), nivelreumaan ja sydänlihastulehdukseen. Toisaalta infektio voi olla myös täysin oireeton. Mekanismit, jotka johtavat B19 tartunnasta autoimmuunisairauteen, ovat vielä tuntemattomia. Kuitenkin tiedetään, että B19:n ei-rakenteellinen proteiini NS1 on soluille tuhoisa ja aiheuttaa niiden kuoleman (apoptoosin) muodostaen solunjäännösten…