Search results for "SELE"

Comparison of degrees of maturity of rabbit lines selected for different traits

2015

[EN] The aim of this work was to study whether commercial nucleus lines of rabbits selected for different traits, and experimental lines having commercial purposes, have the same degree of maturity when compared at the same slaughter age. The study was carried out with 17897 rabbits from Universitat Politècnica de València. Rabbits came from the maternal lines A (3902 rabbits; 44th generation), V (4238 rabbits; 39th generation) and LP (6115 rabbits; 9th generation), selected for litter size at weaning; the paternal line R (2023 rabbits; 25th generation), selected for growth rate between 28 and 63 days of age; the maternal line OR (586 rabbits; 11th generation) selected for ovulation rate; a…

Objekta leņķiskā izmēra ietekme uz neuzmanības akluma uzdevuma izpildi

2018

Maģistra darbs uzrakstīts latviešu valodā uz 38 lapaspusēm. Tas satur 25 attēlus, 4 tabulas, un 36 atsauces uz literatūras avotiem. Darba mērķis: Izmantojot divus neuzmanības akluma video, noskaidrot, vai objekta leņķiskais izmērs ietekmē neuzmanības akluma uzdevuma rezultātus. Metodika: Lai iegūtu dažādus videomateriāla leņķiskos izmērus uz tīklenes, dalībnieki sēdēja dažādos attālumos no ekrāna. Pirms katra video bija sniegta uzdevuma instrukcija, bet pēc video dalībnieki anketās atbildēja uz jautājumiem. Rezultāti un secinājumi: Vīriešu gadījumā novērojama tendence, ka, palielinoties objekta leņķiskajam izmēram, neuzmanības aklums izpaužas mazāk. Perifērijā negaidītam notikumam nav saist…

Larval life history, transmission strategies, and the evolution of intermediate host exploitation by complex life-cycle parasites

2007

Complex life-cycle parasites use their intermediate hosts both as an energy source and as a vessel for transmission to the next host in the life cycle. Parasites that grow rapidly to a large size may have high fitness (e.g. time spent in uninfective stages is limited), yet those that grow too aggressively may reduce host viability and their own probability of successful transmission. I examined aspects of both the growth and transmission strategy of an acanthocephalan (Acanthocephalus lucii) in its isopod intermediate host. In an experimental infection, the relative rate of larval parasite growth slowed over time, and eventually parasites seemed to reach a threshold biomass sustainable by t…

Liikunnan aineenopettajakoulutuksen opiskelijavalinnat muutoksessa

2012

Lipase-catalyzed resolution of β-hydroxy selenides

2006

Abstract Eleven β-hydroxy selenides were kinetically resolved using an immobilized lipase (Amano PS-C II) in toluene in the presence of vinyl acetate at 30 °C. This approach provided, in several cases, both enantiomers in high enantiomeric excess. The role of the size of substituents and the behaviour of cyclic β-hydroxy selenides is also discussed. Enantiopure β-hydroxy selenides are useful building blocks. As an application of this chemistry, enantiopure (1 S ,2 R )-indene oxide was obtained in one step from the proper enantiopure β-hydroxy selenide.

Binding of RNA Aptamers to Membrane Lipid Rafts: Implications for Exosomal miRNAs Transfer from Cancer to Immune Cells

2020

Intraluminal vesicles (ILVs) are released into the extracellular space as exosomes after the fusion of multivesicular bodies (MVBs) with the plasma membrane. miRNAs are delivered to the raft-like region of MVB by RNA-binding proteins (RBPs). RNA loading into exosomes can be either through direct interaction between RNA and the raft-like region of the MVB membrane, or through interaction between an RBP&ndash

Selection of Membrane RNA Aptamers to Amyloid Beta Peptide: Implications for Exosome-Based Antioxidant Strategies

2019

The distribution of amyloid beta peptide 42 (Aβ42) between model exosomal membranes and a buffer solution was measured. The model membranes contained liquid-ordered regions or phosphatidylserine. Results demonstrated that up to ca. 20% of amyloid peptide, generated in the plasma (or intracellular) membrane as a result of proteolytic cleavage of amyloid precursor proteins by β- and γ-secretases, can stay within the membrane milieu. The selection of RNA aptamers that bind to Aβ42 incorporated into phosphatidylserine-containing liposomal membranes was performed using the selection-amplification (SELEX) method. After eight selection cycles, the pool of RNA aptamers was isol…

Autentiskie video materiāli skolēnu klausīšanās prasmju pilnveidei angļu valodas stundās 8. klasē

2022

Diplomdarbā tiek pētīts, kā iespējams pilnveidot 8. klases skolēnu klausīšanās prasmes, izmantojot autentiskos video materiālus angļu valodas stundās. Darbs sniedz ieskatu klausīšanās prasmju nozīmē komunikācijā un autentisko video materiālu izmantošanā angļu valodas stundās. Izvēlētā pētījuma metode bija gadījuma pētījums kādā no Latvijas vidusskolām. Skolēnu aptaujas, testi, skolēnu atsauksmes un intervijas ar trīs angļu valodas skolotājām tika izmantotas kā datu ieguves metodes. Iegūtie dati liecina, ka autentisku video materiālu izmantošana angļu valodas stundās, pozitīvi ietekmē skolēnu klausīšanās prasmes: skolēniem ir vieglāk saprast dažādus akcentus, viņus mazāk ietekmē fona troksni…

Island selection on mammalian life-histories: genetic differentiation in offspring size

2008

BACKGROUND: Since Darwin's pioneering work, evolutionary changes in isolated island populations of vertebrates have continued to provide the strongest evidence for the theory of natural selection. Besides macro-evolutionary changes, micro-evolutionary changes and the relative importance of natural selection vs. genetic drift are under intense investigation. Our study focuses on the genetic differentiation in morphological and life-history traits in insular populations of a small mammal the bank vole Myodes glareolus. RESULTS: Our results do not support the earlier findings for larger adult size or lower reproductive effort in insular populations of small mammals. However, the individuals li…

Genome-wide mapping of signatures of selection using a high-density array identified candidate genes for growth traits and local adaptation in chicke…

2023

Abstract Background Availability of single nucleotide polymorphism (SNP) genotyping arrays and progress in statistical analyses have allowed the identification of genomic regions and genes under selection in chicken. In this study, SNP data from the 600 K Affymetrix chicken array were used to detect signatures of selection in 23 local Italian chicken populations. The populations were categorized into four groups for comparative analysis based on live weight (heavy vs light) and geographical area (Northern vs Southern Italy). Putative signatures of selection were investigated by combining three extended haplotype homozygosity (EHH) statistical approaches to quantify excess of haplotype homoz…