Search results for "Mikroskopi"
showing 10 items of 75 documents
Subcellular localization of bacteriophage PRD1 proteins in Escherichia coli
2014
Bacteria possess an intricate internal organization resembling that of the eukaryotes. The complexity is especially prominent at the bacterial cell poles, which are also known to be the preferable sites for some bacteriophages to infect. Bacteriophage PRD1 is a well-known model serving as an ideal system to study structures and functions of icosahedral internal membrane-containing viruses. Our aim was to analyze the localization and interactions of individual PRD1 proteins in its native host Escherichia coli. This was accomplished by constructing a vector library for production of fluorescent fusion proteins. Analysis of solubility and multimericity of the fusion proteins, as well as their …
Something old, something new : exploring membrane-containing bacteriophages
2016
Microscopical anatomy of the involution of the branchial bars of amphibia [Abinieku žaunu kātu involūcijas mikroskopiskā anatomija]
1936
Teksts angļu valodā, kopsavilkums latviešu valodā.
Ekstrakcijas-pirolītiskās metodes izmantošana nanokristāliska Gd2O3 pulveru un plāno kārtiņu iegūšanai
2019
Ekstrakcijas-pirolītiskās metodes izmantošana nanokristāliska gadolīnija oksīda pulveru un plāno kārtiņu iegūšanai. Burve R., darba vadītāji vadošā pētniece, Dr. chem. Serga V. un asoc. prof., Dr. chem. Švirksts J. Bakalaura darbs, 59 lappuses, 24 attēli, 6 tabulas, 59 literatūras avoti, 18 pielikumi. Latviešu valodā. Darbā apkopota informācija par gadolīnija (III) oksīda īpašībām, izmantošanas iespējām un iegūšanas metodēm. Darba ietvaros ar ekstrakcijas-pirolītisko metodi (EPM) iegūti gadolīnija (III) oksīda nanokristāliskie pulveri un plānās kārtiņās uz dažāda veida stikla substrātiem. Tika izpētītas iegūtā prekursora termiskās īpašības, izmantojot termogravimetrijas un diferenciālās ske…
Ar stroncija daļēji aizvietotu hidroksilapatītu pārklājumu raksturošana
2018
Darbā apkopota informācija par hidroksilapatītu īpašībām, to izpētes metodēm un pārklājuma sintēzi ar plazmas elektrolītisko oksidāciju. Eksperimentālajā daļā paraugi analizēti, izmantojot skenējošo elektronmikroskopiju, elementu procentuālais saturs paraugos noteikts ar rentgenfluorescences spektrometriju un funkcionālās grupas raksturotas ar Furjē transformācijas infrasarkano spektrometriju. Veikti eksperimenti, lai noskaidrotu iegūto pārklājumu luminiscentās īpašības.
Anatomie microscopique de l'involution des troncs branchiaux des amphibiens
1938
Izvilkums no: Archives d'anatomie, d'histologie et d'embryologie normales et expérimentales, t. xxv, 1938, p. 1-64.
Study of Toner Penetration in Papers by Laser Induced Plasma Spectroscopy and Optical Profilometry
2023
Four major toners are used in the printing industry, cyan, magenta, yellow and black (Key) for making color images on paper. Paper brands suitable for printing have thin mineral/latex coatings, and toners are applied on top of the coating in the printing process. Chemical compositions from toner to toner, as well as from coating to coating, vary according to the needs of the end user. Interactions between the toner and the coating define the final color formation of the images in printing. Hence, it is important to study characteristics and dynamics of toners on coated papers. In this paper, we have used laser-induced plasma spectroscopy (LIBS) to provide information on elemental distributi…
Effects of activated carbon ageing in three PCB contaminated sediments: Sorption efficiency and secondary effects on Lumbriculus variegatus.
2015
The sorption efficiency and possible secondary effects of activated carbon (AC) (o 63-200 μm) was studied with Lumbriculus variegatus in three PCB contaminated sediments applying long AC-sediment contact time (3 years). AC amendment efficiently reduced PCB bioavailability as determined with both, L. variegatus bioaccumulation test and passive samplers. However, dose related secondary effects of AC on egestion rate and biomass were observed (applied doses 0.25% and 2.5% sediment dry weight). The sorption capacity and secondary effects remained similar when the experiments were repeated after three years of AC-sediment contact time. Further, transmission electron microscopy (TEM) samples reve…
Bio-imaging with the helium-ion microscope: A review
2021
Scanning helium-ion microscopy (HIM) is an imaging technique with sub-nanometre resolution and is a powerful tool to resolve some of the tiniest structures in biology. In many aspects, the HIM resembles a field-emission scanning electron microscope (FE-SEM), but the use of helium ions rather than electrons provides several advantages, including higher surface sensitivity, larger depth of field, and a straightforward charge-compensating electron flood gun, which enables imaging of non-conductive samples, rendering HIM a promising high-resolution imaging technique for biological samples. Starting with studies focused on medical research, the last decade has seen some particularly spectacular …
Blistering mechanisms of atomic-layer-deposited AlN and Al2O3 films
2017
Blistering of protective, structural, and functional coatings is a reliability risk pestering films ranging from elemental to ceramic ones. The driving force behind blistering comes from either excess hydrogen at the film-substrate interface or stress-driven buckling. Contrary to the stress-driven mechanism, the hydrogen-initiated one is poorly understood. Recently, it was shown that in the bulk Al-Al2O3 system, the blistering is preceded by the formation of nano-sized cavities on the substrate. The stress-and hydrogen-driven mechanisms in atomic-layer-deposited (ALD) films are explored here. We clarify issues in the hydrogen-related mechanism via high-resolution microscopy and show that at…