Search results for "SELE"
showing 10 items of 4721 documents
A no-carrier-added 72Se/72As radionuclide generator based on distillation
2004
Abstract Arsenic-72 is a positron emitting isotope with promising properties for syntheses of 72As-labelled radiopharmaceuticals for future application in positron emission tomography. This work describes the radiochemical separation of no-carrier-added 72Se from cyclotron irradiated germanium targets and the development of a 72Se/72As radionuclide generator, avoiding the addition of any selenium carrier. Using a vertical quartz tube device, no-carrier-added 72As is nearly quantitatively released from various chloride salt solutions containing 72Se within 10 min at a temperature of 100 °C in an HCl gas flow. The kinetics of the 72Se/72As isotope generator has been studied in relation to tem…
Przeszczepy narządowe w okresie epidemii COVID-19
2020
Epidemia COVID-19 zmieniła podejście do kwalifikacji dawców i biorców przeszczepów narządowych. Kwalifikacja następuje po obowiązkowym wykonaniu tomografii komputerowej płuc i testu RT-PCR na obecność wirusa, w wyniku indywidualnej oceny korzyści i ryzyka zakażenia. W bardziej odległym okresie od transplantacji na ciężkość objawów w większym stopniu niż leczenie immunosupresyjne wpływają zaawansowany wiek i współchorobowości. Pierwszym krokiem w redukcji leczenia immunosupresyjnego u biorców przeszczepów narządowych jest odstawienie leku antyproliferacyjnego z pozostawieniem inhibitora kalcyneuryny i steroidów. Terapia immunosupresyjna znamiennie wydłuża czas eliminacji wirusa, ale może ogr…
Biocentrisms Ludviga Klāgesa filozofijā
2019
Bakalaura darba mērķis ir aplūkot Ludviga Klāgesa filozofijā saskatāmo biocentrismu un noteikt šī jēdziena lietojuma robežas Klāgesa darbu kontekstā. Klāgesa darbos postulēto problēmu potenciālie risinājumi norāda uz ētisku uzstādījumu nepieciešamību, bet nesniedz acīmredzamu adekvātu teorētisko pamatu. Aplūkojot Klāgesa filozofiju, noprotama visai radikāla racionālisma, zinātnes, kristietības un antropocentrisma kritika. Balstoties apsvērumos par vēsturi, filozofisko antropoloģiju un ētiku bakalaura darbā tiek norādīts, ka biocentrisms kā ētiska doktrīna nav savienojama ar Klāgesa uzskatiem: biocentrisms saprotams drīzāk kā metafizisks uzstādījums.
A mate to die for? A model of conditional monogyny in cannibalistic spiders.
2012
Monogynous males in various species actively limit themselves to mating with a single female in their lifetime. Whereas previous models have considered monogyny as an obligate mating strategy, here we explore the potential of monogyny to evolve as a context-specific (conditional) behavior. Using a state-dependent dynamic game model based on the biology of the cannibalistic spider Argiope bruennichi, we confirm that conditional monogyny can evolve under broad conditions, including an even sex ratio. We predict that males should make a terminal investment when mating with large, virgin females, especially if population density is low and the encounter occurs late in the season. We encourage e…
Adolescents’ and mothers’ temperament types and their roles in early adolescents’ socioemotional functioning
2018
The present study examined adolescents’ and mothers’ temperament types and their roles in the socioemotional functioning of early adolescents. A total of 869 sixth-grade students and 668 mothers participated in the study. The students rated their temperament and socioemotional functioning and the mothers rated their own temperament. Latent profile analyses identified four temperament types among the adolescents (resilient, reserved, average, and mixed) and three types among the mothers (resilient, average, and mixed). The results showed that the adolescents with resilient or reserved temperaments reported significantly fewer conduct problems and emotional symptoms, less hyperactivity, and …
Ecología y selección de hábitat de la tórtola común (Streptopelia turtur Linnaeus, 1758) y tórtola turca (Streptopelia decaocto Frivaldszky, 1838) en…
2020
Los organismos seleccionan el hábitat y responden a la estructura del paisaje a diferentes escalas. Se piensa que la forma en que las aves perciben el área y los objetos en el paisaje determina el uso que hacen de ese hábitat. Esto a su vez se rige por su propia historia natural: necesidades de alimentación y nidificación, tamaño corporal y relaciones con la comunidad. En la presente tesis se estudia la ecología y selección del hábitat de una especie en declive, la tórtola común europea (Streptopelia turtur) y de su congénere, la tórtola turca (Streptopelia decaocto) cuya población y distribución se encuentra en expansión. Los objetivos específicos se concentran en: i) evaluar la tendencia …
Marine food web perspective to fisheries‐induced evolution
2021
Abstract Fisheries exploitation can cause genetic changes in heritable traits of targeted stocks. The direction of selective pressure forced by harvest acts typically in reverse to natural selection and selects for explicit life histories, usually for younger and smaller spawners with deprived spawning potential. While the consequences that such selection might have on the population dynamics of a single species are well emphasized, we are just beginning to perceive the variety and severity of its propagating effects within the entire marine food webs and ecosystems. Here, we highlight the potential pathways in which fisheries‐induced evolution, driven by size‐selective fishing, might reson…
Kouluvalintapolitiikka perusopetuksessa: suomalaiskaupunkien koulumarkkinat kansainvälisessä valossa
2006
Tutkimuksessa tarkastellaan kouluvalintapolitiikan käyttöä lasten sijoittamisessa oppivelvollisuuskouluihin. Kyse on ylikansallisesta toimintapolitiikasta, jonka mukaan vanhemmat voivat hakea lapselle koulupaikkaa haluamaansa kouluun ja koulut voivat (osittain) valita oppilaansa. Kouluvalintapolitiikkaa on toteutettu Suomen yhtenäiskoulujärjestelmässä 1990-luvun puolivälistä alkaen. Kouluvalintapolitiikan tapahtumapaikka käsitteellistetään koulumarkkinoiksi. Käsitteen koulumarkkinat päällekkäisiä merkityksiä eritellään ideologiseksi malliksi (koulumarkkinat, hallinnolliseksi malliksi (kvasimarkkinat), alueelliseksi malliksi (paikalliset koulumarkkinat ja empiiriseksi tutkimuskohteeksi (elet…
M14_Microfluidics_for_CNT
2018
The CNT dispersion with low SDBS content allows stable droplet formation but leads to fast formation of CNT plugs in the hydrophobic channels. The selective channel surface treatment allows long-term stable functionality of the microfluidic system.
Transition-Selective Pulses in Zero-Field Nuclear Magnetic Resonance.
2016
We use low-amplitude, ultralow frequency pulses to drive nuclear spin transitions in zero and ultralow magnetic fields. In analogy to high-field NMR, a range of sophisticated experiments becomes available as these allow narrow-band excitation. As a first demonstration, pulses with excitation bandwidths 0.5–5 Hz are used for population redistribution, selective excitation, and coherence filtration. These methods are helpful when interpreting zero- and ultralow-field NMR spectra that contain a large number of transitions.