Search results for "sigma"
showing 10 items of 346 documents
The σ B -dependent regulatory sRNA Rli47 represses isoleucine biosynthesis in Listeria monocytogenes through a direct interaction with the ilvA trans…
2019
International audience; The facultative intracellular pathogen Listeria monocytogenes can persist and grow in a diverse range of environmental conditions, both outside and within its mammalian host. The alternative sigma factor Sigma B (sigma(B)) plays an important role in this adaptability and is critical for the transition into the host. While some of the functions of the sigma(B) regulon in facilitating this transition are understood the role of sigma(B)-dependent small regulatory RNAs (sRNAs) remain poorly characterized. In this study, we focused on elucidating the function of Rli47, a sigma(B)-dependent sRNA that is highly induced in the intestine and in macrophages. Using a combinatio…
Taukaudu mezenhimālo stromālo šūnu iegūšana un raksturošana no SigmaR1 -/- pelēm
2020
Maģistra darba mērķis bija veikt mezenhimālo cilmes (stromālo) šūnu (MCŠ) izdalīšanu no Sigma-1 receptora (SigmaR1) inaktivētā gēna peļu taukaudiem un noteikt to adipodiferenciācijas potenciālu. Šūnu fenotips tika raksturots, nosakot marķieru ekspresiju ar plūsmas citometriju, savukārt izdalīto šūnu adipodiferenciācija tika noteikta ar attēlu metodi un Oil-Red-O ekstrakciju. Fenotipēšana parādīja, ka lielākā daļa šūnu pieder pie MCŠ, ekspresējot CD29, CD44 un SCA-1 virsmas marķierus virs 90 % populācijas līmenī un daļēji ekspresējot CD105. Adipodiferenciācija uzrādīja statistiski ticamu atšķirību starp kontroles un SigmaR1 inaktivētā gēna (SigmaR1 -/-) grupu, izmantojot Oil-Red-O ekstrakcij…
Sigma-1 receptora gēna ietekme uz peļu taukaudu šūnu diferenciāciju par adipocītiem
2021
No taukiem iegūtas mezenhimālās stromas šūnas (AdMSŠ) spēj diferencēties par adipocītiem. Pateicoties diferenciācijas potenciālam, tām ir plašs terapeitisko pielietojumu loks reģeneratīvajā medicīnā. Bakalaura darba mērķis bija izpētīt Sigma-1 (S1R) receptora gēna ietekmi uz peļu taukaudu šūnu diferenciāciju par adipocītiem in vitro. Lai analizētu adipodiferenciāciju AdMSŠ un S1R nozīmi, tika pārbaudīts četru ar taukaudiem saistītu gēnu CEBPA, PPARG, FABP4 un Adiponectin ekspresijas līmenis, kas tika analizēts ar qPCR. MSŠ diferencējas par nobriedušām adipocītu šūnām, ko apstiprina adipodiferenciācijai raksturīgo marķieru FABP4 un Adiponectin ekspresijas paaugstināšanās. Rezultāti norāda, k…
Simulating Secularities: Challenges and Opportunities in the Computational Science of (Non)Religion
2021
This article provides scholars of nonreligion and secularism with an introduction to some of the major opportunities and challenges associated with the growing application of computational methods to the phenomena they study. It also illustrates these opportunities and challenges by describing several overlapping research projects and some of the models of (non)religion they have produced. Finally, the article addresses some of the significant philosophical issues surrounding the use of computer modeling and simulation, focusing on the ethical and epistemological concerns that these tools often raise. I invite scholars of nonreligion to consider adding these techniques to their methodologic…
Searching for signatures around 1920 MeV of a N-* state of three hadron nature
2009
We provide a series of arguments which support the idea that the peak seen in the gamma p -> K+ Lambda reaction around 1920 MeV should correspond to the recently predicted state of J(P) = 1/2(+) as a bound state of K(K) over bar N with a mixture of alpha(0)(980)N and f(0)(980)N components. At the same time we propose polarization experiments in that reaction as a further test of the prediction, as well as a study of the total cross-section for gamma p -> K(+)K(-)p at energies close to threshold and of d sigma/dM(inv) for invariant masses close to the two-kaon threshold.
Sigma-1 Receptor Activation Induces Autophagy and Increases Proteostasis Capacity In Vitro and In Vivo
2019
Dysfunction of autophagy and disturbed protein homeostasis are linked to the pathogenesis of human neurodegenerative diseases and the modulation of autophagy as the protein clearance process has become one key pharmacological target. Due to the role of sigma-1 receptors (Sig-1R) in learning and memory, and the described pleiotropic neuroprotective effects in various experimental paradigms, Sig-1R activation is recognized as one potential approach for prevention and therapy of neurodegeneration and, interestingly, in amyotrophic lateral sclerosis associated with mutated Sig-1R, autophagy is disturbed. Here we analyzed the effects of tetrahydro-N,N-dimethyl-2,2-diphenyl-3-furanmethanamine hyd…
Produktivitātes konverģences tendences Latvijas uzņēmumu līmenī
2020
Maģistra darbs ir veltīts Latvijas uzņēmumu produktivitātes konverģencei periodā no 2010. līdz 2018. gadam. Galvenais datu avots ir ORBIS datubāze, kas apkopoja mikrodatus par vidēji 145 121 uzņēmumiem katru gadu. Darba ietvaros uzņēmuma produktivitāte ir definēta kā reālā pievienotā vērtība uz vienu darbinieku. Izmantojot gan šķērsgriezuma, gan paneļu datu modeļus, tika apstiprināta produktivitātes absolūtā Beta konverģence starp Latvijas uzņēmumiem. Konverģence ātrums atkarībā no šķērsgriezuma modeļiem ir no 2.56% līdz 2.79% gadā, bet tajā pat laikā tika secināts izkliedes palielinājums starp uzņēmumu produktivitātes līmeņiem, kas liecina par sigma-diverģenci. Papildinot regresijas modeļu…
Comparative evolution of P–M system and infection by the sigma virus in French and Spanish populations ofDrosophila melanogaster
1992
SummaryIn 1983, an extensive survey of populations ofD. melanogasterwas started in a southern French region (Languedoc) in two non-Mendelian systems: the P–M system of transposable elements and the hereditary Rhabdovirus sigma. Unexpectedly fast-evolving phenomena were observed and interesting correlations were noted, giving similar geographical pattern to the region in both systems. For these reasons, the analysis was continued and extended towards the north (Rhône Valley) and the south (Spain). In the P–M system, all the Languedoc populations evolved from 1983 to 1991 towards the Q type which is characteristic of the Rhône Valley populations. In contrast, M′ strains are currently observed…
TCH-039 Six Sigma in Healthcare: An Application in the Monitoring of Albumin
2013
Background The high off-label use of albumin persuaded the pharmacy to introduce a request form that uses the internationals guidelines to assess whether the use of albumin is appropriate. This has resulted in a clear reduction in the costs. Purpose To monitor the wards using six sigma methodology (a statistical concept that measures a process in terms of defects); to ensure that all procedures have been followed correctly. Materials and Methods 696 forms for albumin prescriptions coming from 26 wards (August to December 2011) were analysed using Minitab software, which cheques the frequency of the best correct requests (type 1), partially correct requests (type 2) and incorrect requests (t…
Valencian Network of Educational Innovation in Optics
2014
[EN] The Valencian Network of Educational Innovation in Optics consists of three groups from the Universitat de València, Universitat Jaume I, and Universitat Politècnica de València. The participants in the network present an extensive background on performing actions to improve teaching practice. They have been involved for years in scientific outreach activities and in a number of educational innovation projects, which have developed innovative teaching materials. With the aim of sharing their experience and enhance their performance, the three groups have decided to join forces to become a Network of Educational Innovation whose main projects are described in this communication.