Search results for "ETL"

The role of Mediterranean wetlands in climate regulation and greenhouse gases exchanges: from carbon biogeochemistry to European water and nature Dir…

2022

Atesa la seua alta activitat biogeoquímica, els aiguamolls són un dels tipus d'ecosistemes més actius en el cicle global del carboni, amb altes taxes d'intercanvi de carboni i de gasos d'efecte hivernacle (GEH), i, per tant, un gran potencial de regulació climàtica. Una de les parts més importants de la biogeoquímica del carboni als aiguamolls està lligada a les taxes metabòliques, a partir del coneixement de les quals es pot determinar un balanç de carboni associat amb el potencial intercanvi de carboni amb l'atmosfera. La seua capacitat per retindre carboni i mitigar el canvi climàtic, o, per contra, d'alliberar més GEH, i contribuir a l'escalfament global, es determina pel balanç de carb…

Hydrology is reflected in the functioning and community composition of methanotrophs in the littoral wetland of a boreal lake

2010

In lake ecosystems a major proportion of methane (CH4) emissions originate from the littoral zone, which can have a great spatial variability in hydrology, soil quality and vegetation. Hitherto, spatial heterogeneity and the effects it has on functioning and diversity of methanotrophs in littoral wetlands have been poorly understood. A diagnostic microarray based on the particulate methane monooxygenase gene coupled with geostatistics was used to analyse spatial patterns of methanotrophs in the littoral wetland of a eutrophic boreal lake (Lake Kevaton, Eastern Finland). The wetland had a hydrology gradient with a mean water table varying from −8 to −25 cm. The wettest area, comprising the h…

2021

Many phytophagous insects harbor symbiotic bacteria that can be transmitted vertically from parents to offspring, or acquired horizontally from unrelated hosts or the environment. In the latter case, plants are a potential route for symbiont transfer and can thus foster a tripartite interaction between microbe, insect, and plant. Here, we focus on two bacterial symbionts of the darkling beetle Lagria villosa that belong to the genus Burkholderia; the culturable strain B. gladioli Lv-StA and the reduced-genome strain Burkholderia Lv-StB. The strains can be transmitted vertically and confer protection to the beetle’s eggs, but Lv-StA can also proliferate in plants, and both symbiont strains h…

Evaluation of carbamazepine uptake and metabolization by Typha spp., a plant with potential use in phytotreatment

2011

Abstract Phytoremediation technologies such as constructed wetlands have shown higher efficiencies in removal of pharmaceuticals from wastewaters than conventional wastewater treatment processes, and plants seem to have an important role in the removal of some of those compounds. In this context, a study was conducted to assess tolerance, uptake, and metabolism of the epilepsy drug, carbamazepine, by the macrophyte Typha spp. This evaluation was conducted in hydroponic solutions with 0.5–2.0 mg/L of this pharmaceutical for a maximum period of 21 days. The removal of carbamazepine from nutrient solutions by the plants reached values of 82% of the initial contents. Furthermore, a metabolite (…

ETL procesu automatizācija datu noliktavā

2018

Viens no liekākajiem, sarežģītākajiem un laikietilpīgākajiem uzdevumiem datu noliktavā ir ETL procesu izveide, jo ETL tieši ietekmē datu kvalitāti. Viens no veidiem, kā samazināt laiku un resursus, kas tiek iztērēti ETL ir izmantot automatizāciju, kas varētu samazināt cilvēcisko kļūdu rašanos un uzlabot kopējo procesu. Bakalaura darbā “ETL procesu automatizācija datu noliktavā” autore sniedz ieskatu ETL procesu nozīmē, izveides galvenajos soļos un to automatizācijas ierobežojumiem un nepieciešamību datu noliktavā. Darbā ir veikts pētījums, kur autore izveidoja automatizētus ETL procesus izveidotajai datu noliktavai, nodrošinot, regulāru izpildi un datu kvalitāti. Pētījums veikts ar atvērtā …

Functional significance of membrane associated proteolysis in the toxicity of Bacillus thuringiensis Cry3Aa toxin against Colorado potato beetle.

2012

Abstract Bacillus thuringiensis Cry toxins are widely used as biocontrol agents in bioinsecticides and transgenic plants. In the three domain-Cry toxins, domain II has been identified as an important determinant of their highly specific activity against insects. In this work, we assessed the role in membrane associated proteolysis and toxicity in Colorado potato beetle (CPB) of a previously reported ADAM recognition motif present in Cry3Aa toxin domain II. We used site-directed mutagenesis to modify the Bacillus thuringiensis cry3A gene in amino acid residues 344, 346, 347, 351 and 353 of the ADAM recognition motif in Cry3Aa toxin. Cry3Aa toxin mutants displayed decreased toxicity when comp…

Fasetes un to lietošana zināšanu organizācijā

2018

Pētījums „Fasetes un to lietošana zināšanu organizācijā” veikts, lai izpētītu FAST sistēmas attīstību un tās lietošanas aspektus, kā arī ārvalstu bibliotēku pieredzi. Tika aplūkota arī zināšanu organizācijas nozīme informacionālajā vidē, kā arī fasetes un to lietošana klasifikācijā. Pētījuma teorētisko bāzi veido pragmatisms, hermeneitiskais aplis un domēna (darbības lauka) analīzes teorija. Pētījumā tika izmantota kvalitatīvā pētījuma stratēģija un metodes. Pētījumā tika sniegts FAST nosaukuma un terminu – ‘fasete’, ‘fasetpriekšmetošana’ un ‘fasešu priekšmetu termins’ skaidrojums latviešu valodā. Pētījumā tika noskaidroti un apkopoti ārvalstu pētnieku un bibliotēku ekspertu viedokļi par FA…

Molecular barcoding for central-eastern European Crioceris leaf-beetles (Coleoptera: Chrysomelidae)

2011

Abstract Among Crioceris leaf-beetles, the two most widespread species (Crioceris asparagi and C. duodecimpunctata) are serious invasive plant pests, while another two (C. quatuordecimpunctata and C. quinquepunctata) are rare species restricted to steppe-like habitats in Eurasia. The aim of the research was to check the genetic distinctiveness of these four species and develop barcodes for their molecular identification using the mitochondrial Cytochrome Oxidase I (COI) gene and two nuclear markers: Elongation Factor 1-α (EF1-α) and Internal Transcribed Spacer 1 (ITS1). The identification of each species was possible and reliable with the use of COI and ITS1 markers. EF1-α was omitted in an…

Exploring species-level taxonomy in the Cryptocephalus flavipes species complex (Coleoptera: Chrysomelidae)

2016

In insects, morphological species identification is often challenging. The discrimination of closely related species may be hampered when only subtle differences in phenotypic characters or a continuum in their variability are present. This is exemplified in the Cryptocephalus flavipes species complex (Coleoptera; Chrysomelidae) where, until now, the species have been discriminated only by the yellow pattern on frons, pronotum, and epipleurae. In the present study, the phylogeny of the C. flavipes species complex was resolved through a multi-locus sequence approach, and the inclusion in the group of the phenotypically similar Cryptocephalus quadripustulatus Gyllenhal, 1813 was evaluated. Su…

Zvaigžņotā Debess: 2000, Rudens (169)

2000

Contents: M.Zepe. Water Steam in the Venus Atmosphere ; B.Sala, L.Kondraševa. Use of Solar Energy ; A.Balklavs. Century Long Astrophysics ; Z.Alksne, A.Alksnis. Plenty of Extrasolar Planets ; Z.Alksne, A.Alksnis. Unexpected Discovery of Spiral Structure in a Dwarf Elliptical Galaxy ; A.Balklavs. Hunting for the Black Holes ; J.Jaunbergs. Private Enterprise on Mir ; T.Czarnik. Surviving Explosive Decompression ; M.Gills. Space Research 40 Years Ago – Chronicle ; M.Krastiņš. Impressions about Rose Center for the Earth and Space ; K.Bērziņš. On Friendly Terms with Cosmology: Basic Principles and Models of the Universe (continuation) ; V.Flerov, A.Cēbers, D.Docenko, V.Kaščejev. Latvia 24th Open…