Search results for "ATRA"
showing 10 items of 381 documents
Fitness drift of an atrazine-degrading population under atrazine selection pressure.
2008
International audience; Pseudomonas sp. ADP harbouring the atrazine catabolic plasmid ADP1 was subcultured in liquid medium containing atrazine as sole source of nitrogen. After approximately 320 generations, a new population evolved which replaced the initial population. This newly evolved population grew faster and degraded atrazine more rapidly than the initial population. Plasmid profiles and Southern blot analyses revealed that the evolved strain, unlike the ancestral strain, presented a tandem duplication of the atzB gene encoding the second enzyme of the atrazine catabolic pathway responsible for the transformation of hydroxyatrazine to N-isopropylammelide. This duplication resulted …
Impact of maize mucilage on atrazine mineralization andatzC abundance
2005
Soil was amended with maize mucilage, a major rhizodeposit, to study its role on the number of culturable soil micro-organisms, the structure of the bacterial community, atrazine mineralization and atzC abundance. The maximal percentage of atrazine mineralization was lower for mucilage-amended than for water-amended soil. Total culturable soil bacteria and 16S rDNA copy number, measured by RT-PCR, presented similar values and were not significantly (P < 0.05) different among treatments. Mucilage applied at a rate of 70 mu g C g(-1) dry soil day(-1) over two weeks did not modify the abundance of the total soil microflora. Global structure of soil bacterial communities revealed by RISA analys…
Reālās dzīves objektu atrašanās vietu noteikšana
2016
Darba mērķis ir izpētīt kā ar tehnoloģiju palīdzību reālā laikā var uzraudzīt dažādu reālās dzīves objektu atrašanās vietas, piemēram, automašīnas, bērna vai kustībā esoša slēpotāja atrašanās vietu. Darba uzdevumi ir izpētīt problēmas, ar kurām jāsaskaras izstrādājot šāda veida sistēmas, izstrādāt šādu sistēmu konceptuālo darbības modeli un piedāvāt savu risinājumu, kas balstīts uz šī modeļa. Šādu sistēmu problēmas parasti saistās ar atrašanās vietas datu iegūšanas, kā arī datu transportēšanas drošību un resursu taupības aspektu. Šādu sistēmu izmantošana varētu atvieglot dažādu ikdienišķu darbību norisi un ar tehnoloģiju palīdzību ļaut mums sniegt atbildi uz jautājumu tik ikdienišķu jautāju…
Izmaiņu ieviešanas analīze stingri regulētā vidē lielajā uzņēmumā
2021
Mūsdienas tehnoloģijas piedāvā plašas izaugsmes iespējas uzņēmējdarbībai, tāpēc uzņēmumiem kļūst ar vien grūtāk sekot līdzi un analizēt savu iekšējo darbplūsmu. Lai to izdarītu, uzņēmumiem ir jāīsteno stingru kontroles politiku, kas varētu palīdzēt regulēt un standartizēt darba izpildi. Turklāt augsto tehnoloģiju attīstības tempu dēļ, uzņēmumi turpina īstenot jaunus risinājumus, kurus arī ir jākontrolē. Maģistra darbā tiks analizētas vairākas uzņēmuma “X” iekšējo procesu uzlabošanas un optimizācijas iniciatīvas ar IT palīdzību. Analīzes rezultātā būs izteikti ieteikumi un labas prakses, kuras varētu palīdzēt saprast kam ir nepieciešams pievērst uzmanību pirms procesu izmaiņas ieviešanas.
PFS pielāgošana dažādu klientu prasībām
2021
Darbā tiek salīdzinātas divas pieejas standartizēta produkta ieviešanai un uzturēšanai: ● Produkta versijas pielāgošana visiem klientiem, ● Individuāli katram klientam izveidota un uzturēta versija. Autors detalizēti aplūko katru pieeju un izvērtē tās ieguvumus un trūkumus. Aplūkotās pieejas tiks skatītas reālas sistēmas Pensiju fonda sistēma (PFS) kontekstā. Pašreiz PFS lieto divi pensiju fondi Latvijā. Bakalaura darba izstrādes laikā autors ir projekta dalībnieks PFS ieviešanai trešajam pensiju fondam Latvijā.
TRAIL Triggers CRAC-Dependent Calcium Influx and Apoptosis through the Recruitment of Autophagy Proteins to Death-Inducing Signaling Complex
2021
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) selectively kills various cancer cell types, but also leads to the activation of signaling pathways that favor resistance to cell death. Here, we investigated the as yet unknown roles of calcium signaling and autophagy regulatory proteins during TRAIL-induced cell death in leukemia cells. Taking advantage of the Gene Expression Profiling Interactive Analysis (GEPIA) project, we first found that leukemia patients present a unique TRAIL receptor gene expression pattern that may reflect their resistance to TRAIL. The exposure of NB4 acute promyelocytic leukemia cells to TRAIL induces intracellular Ca2+ influx through a calcium rel…
Survival of occlusal ART restorations in primary molars placed in school environment and hospital dental setup-one year follow-up study
2010
Objective: The objectives of this clinical study were to: evaluate the survival of occlusal atraumatic restorative treatment (ART) restorations, on a longitudinal basis, in the primary molars of children; and compare the success rate of ART restorations placed in school environment and in hospital dental setup.Study design: One dentist placed 120 ART restorations in 60 five- to seven year-olds who had bilateral matched pairs of carious primary molars. A split-mouth design was used to place restorations in school and in hospital dental setup, which were assigned randomly to contralateral sides. Restorations were evaluated after 6 and 12 months using the ART criteria. Results: The survival ra…
Changes in yield ofin-vivo fluorescence of chlorophyll a as a tool for selective herbicide monitoring
1993
Triazines and derivatives of phenylurea, which are often found in outdoor water samples, induce specific changes in the yield of thein-vivo chlorophyll α-fluorescence of PSII. These changes are correlated quantitatively with the concentration of the herbicides and can therefore be used to set-up a low-price monitor system. In order to detect selectively the herbicide-sensitive part of the fluorescence emission a pulse amplitude modulated fluorimeter was used. The bioassay system was optimised with respect to test organism, growing and measuring conditions. The relationship between fluorescence yield and herbicide concentrations were experimentally determined for the triazines atrazine and s…
Determination of pesticides in soil samples by solid phase extraction disks
1993
A systematic study comparing the methodology and analytical results obtained in an investigation of seven pesticide residues (Molinate, Atrazine, Carbofuran, Pirimicarb, Prometryn, Malathion and Tetrachlorvinphos) in soil samples is reported. Solid-phase extraction (SPE) using glass columns and 47 mm disks of octyl and octadecyl-bonded silica was used in the pesticide analysis. The best extraction efficiency and clearest extracts are obtained with C8 disks. The analyses were carried out by capillary gas chromatography with nitrogen and phosphorus detection. Recovery experiments were performed at ppb levels in spiked soil samples. The average recoveries of the compounds were 53–77%. Detectio…
Alternative to oral dicoumarin anticoagulants: Considerations in dental care
2013
Introduction: For over 50 years, vitamin K antagonists such as warfarin (Aldocumar®) and acenocoumarol (Sintrom®) have been the gold standard for reducing the risk of cerebrovascular events. In the last 5 years alternative anticoagulants have been evaluated that act directly upon a concrete target within the coagulation cascade, thereby affording a more predictable anticoagulant effect. The present study offers an update on the new oral anticoagulants and reviews the implications referred to the dental care of patients administered these substances. Material and methods: An exhaustive PubMed-Medline and Cochrane Library search was made of the main alternatives to conventional oral anticoagu…