Search results for "rasa"
showing 10 items of 125 documents
Humīnskābju izdalīšana no kūdras un to pētīšana
2017
Bakalaura darba ietvaros tika izpētīta attiecīgā zinātniskā, metodiskā un mācību literatūra par humusvielām, to izdalīšanas metodēm un humīnskābju pētīšanas metodēm. No astoņiem kūdras paraugiem divos eksperimentos tika izdalītas humīnskābes un noteiktas to masas daļas. Izmantojot FTIR-ATR metodi tika uzņemti un analizēti humīnskābju IS spektri un lietojot Kjeldāla metodi noteica slāpekļa daudzums paraugos. Izdalītajām kūdras humīnskābem, lietojot izotopu attiecību masspektrometriju, noteica 13C un 15N.
Modificēto poli(ēter ētera)ketona un alkilimidazolija jonu šķidrumu kompozīto membrānu struktūra, termiskās īpašības un infrasarkano spektru analīze
2015
Modificēto poli(ēter ētera) ketona un alkilimidazolija jonu šķidrumu kompozīto membrānu struktūra, termiskās īpašības un infrasarkano spektru analīze. Žarova A., zinātniskais vadītājs Dr. chem., doc. Vaivars G. Maģistra darbs, 46 lappuses, 27 attēli, 6 tabulas, 33 literatūras avoti. Latviešu valodā.
Lo Faso Pietrasanta Domenico
2010
voce bio-bibliografica su Domenico Lo Faso Pietrasanta, duca di Serradifalco
Two New Glycosides from Astragalus caprinus
2001
A new glycoside of flavonol (1) and a new glycoside of a cycloartane-type triterpene (2) were isolated from the leaves and the roots of Astragalus caprinus, respectively. Their structures were elucidated in turn by spectroscopic data interpretation as 3-O-[[beta-D-xylopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->6)][beta-D-apiofuranosyl(1-->2)]]-beta-D-galactopyranosyl kaempferol (1) and 3-O-(beta-D-xylopyranosyl)-24-O-(beta-D-glucopyranosyl)-20,25-epoxycycloartane-3beta,6alpha,16beta,24alpha-tetrol (2).
Haem Biosynthesis and Antioxidant Enzymes in Circulating Cells of Acute Intermittent Porphyria Patients
2016
The aims of the present study were to explore the expression pattern of haem biosynthesis enzymes in circulating cells of patients affected by two types of porphyria (acute intermittent, AIP, and variegate porphyria, VP), together with the antioxidant enzyme pattern in AIP in order to identify a possible situation of oxidative stress. Sixteen and twelve patients affected by AIP and VP, respectively, were analysed with the same numbers of healthy matched controls. Erythrocytes, neutrophils and peripheral blood mononuclear cells (PBMCs) were purified from blood, and RNA and proteins were extracted for quantitative real time PCR (qRT-PCR) and Western-blot analysis, respectively. Porhobilinogen…
A novel class of potent nonglycosidic and nonpeptidic pan-selectin inhibitors.
2006
An early step of the inflammatory response, the rolling of leukocytes on activated endothelial cells, is mediated by selectin/carbohydrate interactions. The tetrasaccharide sialy Lewisx is a ligand for E-, P-, and L-selectin and therefore serves as a lead structure for the development of analogues. A combination of synthesis and structure-based design allowed rapid optimization. The current lead 2a was evaluated in our E-selectin cell flow chamber assay where it proved to inhibit rolling and adhesion with an IC50 of 28+/-7 microM. The assays used are predictive for the in vivo efficacy of test compounds as shown for 2a in a proteose peptone induced peritonitis model of acute inflammation in…
Simultaneous controlled iontophoretic delivery of pramipexole and rasagiline in vitro and in vivo: Transdermal polypharmacy to treat Parkinson's dise…
2018
[EN] Effective treatment of Parkinson's disease (PD) involves administration of therapeutic agents with complementary mechanisms of action in order to replenish, sustain or substitute endogenous dopamine. The objective of this study was to investigate anodal co-iontophoresis of pramipexole (PRAM; dopamine agonist) and rasagiline (RAS; MAO-B inhibitor) in vitro and in vivo. Passive permeation of PRAM and RAS (20 mM each) across porcine skin after 6 h was 15.7 +/- 1.9 and 16.0 +/- 2.9 mu g/cm(2), respectively. Co-iontophoresis at 0.15, 0.3 and 0.5 mA/cm(2) resulted in statistically significant increases in delivery of PRAM and RAS; at 0.5 mA/cm(2), cumulative permeation of PRAM and RAS was 61…
Spatial coherence and potential predictability of intraseasonal descriptors of the rainy season in Soudano-Sahelian Africa : application to the pearl…
2010
The aim of this thesis is twofold : (i) fill a lack of knowledge about the spatial coherence and seasonal predictability of the intraseasonal characteristics (ISC) of the soudano-sahelian rainy season. These ISC are the seasonal rainfall amount (S), the daily rainfall frequency > 1 mm (O), the daily rainfall mean intensity (I), the dates of the onset and withdrawal of the rainy season, the mean length of the dry (LDS) and/or wet spells (LWS) ; (ii) document the climate-agriculture relationship over the Niamey area based on the millet crop example.From FRIEND-AOC daily rainfall records (1950-2000) for a 136 stations-network located in Senegal, Mali, Burkina-Faso and Niger, the spatial cohere…
Hitler regala una città agli ebrei. Musica e cultura nel ghetto di Theresienstadt
2008
l volume ricostruisce la vicenda culturale del ghetto di Theresienstadt, nel quadro della "soluzione finale" del problema ebraico (1941-45). In particolare, vengono descritte le biografie e le più importanti partiture realizzate - prima e durante la loro deportazione - da alcuni fra i compositori rinchiusi nel Lager (Pavel Haas, Hans Krasa, Viktor Ullmann). Il testo si avvale di un repertorio iconografico proveniente, in parte, dagli archivi del Unites States Holocaust Memorial Museum di Washington D.C. e del Yad Vashem di Gerusalemme. In appendice è riportata la prima traduzionelie italiana del saggio di Miroslav Karny "Il Lager per famiglie di Theresienstadt (BIIb) a Birkenau (settembre 1…
Polymeric Selectin Ligands Mimicking Complex Carbohydrates: From Selectin Binders to Modifiers of Macrophage Migration
2016
Novel polymeric cell adhesion inhibitors were developed in which the selectin tetrasaccharide sialyl-LewisX (SLeX ) is multivalently presented on a biocompatible poly(2-hydroxypropyl)methacrylamide (PHPMA) backbone either alone (P1) or in combination with O-sulfated tyramine side chains (P2). For comparison, corresponding polymeric glycomimetics were prepared in which the crucial "single carbohydrate" substructures fucose, galactose, and sialic acid side chains were randomly linked to the PHPMA backbone (P3 or P4 (O-sulfated tyramine)). All polymers have an identical degree of polymerization, as they are derived from the same precursor polymer. Binding assays to selectins, to activated endo…