Search results for "GATES"

Fitness and viability of small populations : the effects of genetic drift, inbreeding, and interpopulation hybridization

2012

Aizsarglietu stāstījumu folklora Latgalē (pēc 2018. un 2019. gada lauka pētījumu materiāliem)

2019

Bakalaura darba tēma ir “Aizsarglietu stāstījumu folklora Latgalē (pēc 2018. un 2019. gada lauka pētījumu materiāliem)”. Bakalaura darba mērķis bija noskaidrot, kas ir raksturīgs aizsarglietu stāstījumu folklorai Latgalē, kāda ir tās specifika, vai un kā ir transformējušās ar aizsarglietām saistītās latviešu tautas tradīcijas, salīdzinot ar latviešu folkloras materiālu. Darbs sastāv no ievada, trim nodaļām un, secinājumiem. Pirmajā nodaļā tika analizēti aizsarglietu stāstījumi, kas vēsta par mājas aizsardzību (māju, īpašumu aizsargājošiem augiem, ornamentālajām zīmēm, baznīcā svētītajām aizsarglietām), un tika noskaidroti aizsarglietu izmantošanas dažādie nolūki. Otrajā nodaļā tika raksturo…

Surfactant self-assembling in the gas phase: bis(2-ethylhexyl)- sulfosuccinate divalent metal ion anionic aggregates

2012

RATIONALE: Investigation of fundamental aspects driving surfactant self-assembling and of the capability of including guest molecules or ions in their micellar aggregates is an exciting research field for theoretical and technological reasons. In this light, assembling and chelating properties of sodium bis(2-ethylhexyl)sulfosuccinate (AOTNa) towards divalent metal ion chlorides have been investigated in the gas phase by electrospray ionization mass spectrometry in negative ion mode, tandem mass spectrometry and energy-resolved mass spectrometry. METHODS:Water/methanol solutions of AOTNa and chloride salts of nickel, magnesium, calcium and manganese, with different AOTNa/metal salt ratios, …

Review: Mass spectrometry of surfactant aggregates

2011

In contrast with the enormous amount of literature produced during many decades in the field of surfactant aggregation in liquid, liquid crystalline and solid phases, only a few investigations concerning surfactant self-assembling in the gas phase as charged aggregates have been carried out until now. This lack of interest is disappointing in view of the remarkable theoretical and practical importance of the inherent knowledge. The absence of surfactant–solvent interactions makes it easier to study the role of surfactant–surfactant forces in determining their peculiar self-assembling features as well as the ability of these assemblies to incorporate selected solubilizate molecules. Thus, th…

SERS detection of cell surface and intracellular components of microorganisms using nano-aggregated Ag substrate

2016

Abstract The intracellular and cell surface composition and structural features of gram-positive and gram-negative bacteria were identified using near-infrared surface-enhanced Raman scattering (SERS). The structural differences of components that reside in the cell envelope are manifested by their SERS spectra, e.g. gram-negative vs. gram-positive. Silver particles were used as a SERS substrate by exploiting the existence of strong local electromagnetic fields (hot spots) within nanoscale aggregates of the particles. The aggregation of silver nanoparticles was induced by magnesium ions. These hot spots reduce the screening length of the double layer. The obtained SERS spectra showed excell…

Development of polypeptide-based therapeutics for topical delivery

2019

Topical administration represents the main route to attain local therapeutic activity of bioactive agents in several organs, such as the skin or the heart by means of devices that enhance drug transport through the endothelium acting as a reservoir. The complex structure of the skin protects the human body against potentially harmful external agents; however, this protective mechanism inhibits the penetration of topically administering bioactive agents employed for the treatment of skin diseases. Unfortunately, many of the topical drugs currently used or under evaluation in clinical trials lack the appropriate physico-chemical characteristics required for delivery through the skin. However,…