Search results for "Rods"

Current Spreading Length and Injection Efficiency in ZnO/GaN-Based Light-Emitting Diodes

2019

We report on carrier injection features in light-emitting diodes (LEDs) based on nonintentionally doped-ZnO/p-GaN heterostructures. These LEDs consist of a ZnO layer grown by chemical-bath deposition (CBD) onto a p-GaN template without using any seed layer. The ZnO layer (~1- $\mu \text{m}$ thickness) consists of a dense collection of partially coalesced ZnO nanorods, organized in wurtzite phase with marked vertical orientation, whose density depends on the concentration of the solution during the CBD process. Due to the limited conductivity of the p-GaN layer, the recombination in the n-region is strongly dependent on the spreading length of the holes, ${L}_{h}$ , coming from the p-contact…

Biosynthesis of selenium-nanoparticles and -nanorods as a product of selenite bioconversion by the aerobic bacterium Rhodococcus aetherivorans BCP1

2018

The wide anthropogenic use of selenium compounds represents the major source of selenium pollution world- wide, causing environmental issues and health concerns. Microbe-based strategies for metal removal/recovery have received increasing interest thanks to the association of the microbial ability to detoxify toxic metal/ metalloid polluted environments with the production of nanomaterials. This study investigates the tolerance and the bioconversion of selenite (SeO32−) by the aerobically grown Actinomycete Rhodococcus aetherivorans BCP1 in association with its ability to produce selenium nanoparticles and nanorods (SeNPs and SeNRs). The BCP1 strain showed high tolerance towards SeO32− with…

Cofilin and Neurodegeneration: New Functions for an Old but Gold Protein

2021

Cofilin is an actin-binding protein that plays a major role in the regulation of actin dynamics, an essential cellular process. This protein has emerged as a crucial molecule for functions of the nervous system including motility and guidance of the neuronal growth cone, dendritic spine organization, axonal branching, and synaptic signalling. Recently, other important functions in cell biology such as apoptosis or the control of mitochondrial function have been attributed to cofilin. Moreover, novel mechanisms of cofilin function regulation have also been described. The activity of cofilin is controlled by complex regulatory mechanisms, with phosphorylation being the most important, since t…

Physical–chemical properties of biogenic selenium nanostructures produced by stenotrophomonas maltophilia SeITE02 and ochrobactrum sp. MPV1

2018

Stenotrophomonas maltophilia SeITE02 and Ochrobactrum sp. MPV1 were isolated from the rhizosphere soil of the selenium-hyperaccumulator legume Astragalus bisulcatus and waste material from a dumping site for roasted pyrites, respectively. Here, these bacterial strains were studied as cell factories to generate selenium-nanostructures (SeNS) under metabolically controlled growth conditions. Thus, a defined medium (DM) containing either glucose or pyruvate as carbon and energy source along with selenite (SeO23−) was tested to evaluate bacterial growth, oxyanion bioconversion and changes occurring in SeNS features with respect to those generated by these strains grown on rich media. Transmissi…

Rhodococcus aetherivorans BCP1 as cell factory for the production of intracellular tellurium nanorods under aerobic conditions

2016

Tellurite (TeO3 2−) is recognized as a toxic oxyanion to living organisms. However, mainly anaerobic or facultative-anaerobic microorganisms are able to tolerate and convert TeO3 2− into the less toxic and available form of elemental Tellurium (Te0), producing Te-deposits or Te-nanostructures. The use of TeO3 2−-reducing bacteria can lead to the decontamination of polluted environments and the development of “green-synthesis” methods for the production of nanomaterials. In this study, the tolerance and the consumption of TeO3 2− have been investigated, along with the production and characterization of Te-nanorods by Rhodococcus aetherivorans BCP1 grown under aerobic conditions. Aerobically …

Photoluminescent zinc oxide nanorods – a new tool for detection of human leukemic cells

2018

Safety and immunomodulatory effects of three probiotic strains isolated from the feces of breast-fed infants in healthy adults: SETOPROB study.

2013

We previously described the isolation and characterization of three probiotic strains from the feces of exclusively breast-fed newborn infants: Lactobacillus paracasei CNCM I-4034, Bifidobacterium breve CNCM I-4035 and Lactobacillus rhamnosus CNCM I-4036. These strains were shown to adhere to intestinal mucus in vitro, to be sensitive to antibiotics and to resist biliary salts and low pH. In the present study, a multicenter, randomized, double-blind, placebo-controlled trial with 100 healthy volunteers in three Spanish cities was carried out to evaluate the tolerance, safety, gut colonization and immunomodulatory effects of these three probiotics. Volunteers underwent a 15-day washout perio…

Super omnias veritas. Latvijas vēsturnieku darbs un likteņi

2018

Latvijas Universitātes (LU) Bibliotēkas stenda referāts prezentēts Latvijas vēsturnieku 2. kongresā un sniedz ieskatu LU Bibliotēkas nozīmīgajā darbā LU intelektuālo sasniegumu un kultūrvēsturiskā mantojuma saglabāšanā un popularizēšanā. Stenda referāts iepazīstina ar LU Bibliotēkas vienu no pētnieciskās darbības virzieniem - virtuālajām izstādēm, kas veltītas augstskolas vēsturei, sasniegumiem un ievērojamām personībām zinātnē.

ZnO nanorod arrays fabrication via chemical bath deposition: Ligand concentration effect study

2010

A new ligand, N, N, N', N'-tetramethylethylenediamine, has been used to grow ZnO nanorods on silicon substrates via a two steps approach. A preliminary seeding on silicon substrates has been combined with chemical bath deposition using a Zinc acetate - N, N, N', N'-tetramethylethylenediamine aqueous solution. The used diamino ligand has been selected as Zn(2+) complexing agent and the related hydrolysis generates the reacting ions (Zn(2-) and OH(-)) responsible for the ZnO growth. The seed layer has been annealed at low temperature (<200 degrees C) and the ZnO nanorods have been grown on this ZnO amorphous layer. There is experimental evidence that the ligand concentration (ranging from 5 t…

Darba vides uzlabošana SIA “Ausmeņa”

2020

Kvalifikācijas darba autore: Diāna Laizāne Kvalifikācijas darba vadītājs: mg.sc; mg.oec., Iveta Daugule Kvalifikācijas darba tēma: „Darba vides uzlabošana SIA “Ausmeņa”. Kvalifikācijas darba mērķis – analizēt ar Darba aizsardzības sistēmu saistītās problēmas, novērtēt metodes, izdarīt secinājumus un sniegt priekšlikumus darba aizsardzības sistēmas uzlabošanai. Kvalifikācijas darba teorētiskā daļa: SIA „Ausmeņa” darba aizsardzības sistēmas uzlabošana uzņēmumā, obligāto veselības pārbaužu veikšana un riska mazināšana. Kvalifikācijas darba analītiskā daļa: Uzņēmuma raksturojums, nelaimes gadījumu statistika, strādājošo arodveselības problēmas uzņēmumā, darba vietas un tajā esošo darba vides ri…