Study of the Resonance Energy Transfer Between Two Dye Cations Embedded in Layered Silicates

The Langmuir – Blodgett (LB) method is one of the useful techniques to prepare ultra-thin films with precise organization of embedded dye cations. The main limitations for the preparation of LB films is that the surfactants, building blocks of the LB films, must be amphiphiles and not soluble in water. In our study we used laser dye cation (rhodamine) with long alkyl chain in the structure, which makes this cation sufficiently hydrophobic. The alkylammonium chain helps to prevent dye molecular aggregation. The objective of this study was to prepare LB films built from synthetic saponite particles and adsorbed alkylammonium and organic dye cations. Energy transfer between two dye cations in LB films was studied. Oxazine 4 – energy acceptor molecules - does not represent an amphiphilic molecule, and is soluble in water. This problem we solved using long chain alkylammonium solution as the third component. We found out RET proceeded with high yields. The molecules of rhodamine played the role of molecular antennas absorbing green light (energy donor). Resonance energy transfer was detected as a quenching of light emission from rhodamine (580 nm) in favour of the red light luminescence from oxazine ( 623 nm), playing the role of energy acceptor. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3530

Accession Site Does Not Influence the Risk of Stroke after Diagnostic Coronary Angiography or Intervention: Results from a Large Prospective Registry

INTRODUCTION: Periprocedural stroke represents a rare but serious complication of cardiac catheterization. Pooled data from randomized trials evaluating the risk of stroke following cardiac catheterization via transradial versus transfemoral access showed no difference. On the other hand, a significant difference in stroke rates favoring transradial access was found in a recent meta-analysis of observational studies. Our aim was to determine if there is a difference in stroke risk after transradial versus transfemoral catheterization within a contemporary real-world registry. METHODS: Data from 14,139 patients included in a single-center prospective registry between 2009 and 2016 were used to determine the odds of periprocedural transient ischemic attack (TIA) and stroke for radial versus femoral catheterization via multivariate logistic regression with Firth's correction. RESULTS: A total of 10,931 patients underwent transradial and 3,208 underwent transfemoral catheterization. Periprocedural TIA/stroke occurred in 41 (0.29%) patients. Age was the only significant predictor of TIA/stroke in multivariate analysis, with each additional year representing an odds ratio (OR) = 1.09 (CI 1.05-1.13, p < 0.000). The choice of accession site had no impact on the risk of periprocedural TIA/stroke (OR = 0.81; CI 0.38-1.72, p = 0.577). CONCLUSION: Observational data from a large prospective registry indicate that accession site has no influence on the risk of periprocedural TIA/stroke after cardiac catheterization

Links Between Hydrothermal Environments, Pyrophosphate, Na+, and Early Evolution

The discovery that photosynthetic bacterial membrane-bound inorganic pyrophosphatase (PPase) catalyzed light-induced phosphorylation of orthophosphate (Pi) to pyrophosphate (PPi) and the capability of PPi to drive energy requiring dark reactions supported PPi as a possible early alternative to ATP. Like the proton-pumping ATPase, the corresponding membrane-bound PPase also is a H+-pump, and like the Na+-pumping ATPase, it can be a Na+-pump, both in archaeal and bacterial membranes. We suggest that PPi and Na+ transport preceded ATP and H+ transport in association with geochemistry of the Earth at the time of the origin and early evolution of life. Life may have started in connection with early plate tectonic processes coupled to alkaline hydrothermal activity. A hydrothermal environment in which Na+ is abundant exists in sediment-starved subduction zones, like the Mariana forearc in the W Pacific Ocean. It is considered to mimic the Archean Earth. The forearc pore fluids have a pH up to 12.6, a Na+-concentration of 0.7 mol/kg seawater. PPi could have been formed during early subduction of oceanic lithosphere by dehydration of protonated orthophosphates. A key to PPi formation in these geological environments is a low local activity of water

Instagram as a marketing tool

The bachelor thesis deals with Instagram in terms of marketing purposes. The main goal is set to create principles and recommendations on how to appropriately use this platform for marketing communication. The introductory part describes the area of online marketing, which is later specified to social media marketing. The next part introduces the Instagram application, and that is from explaining its functions and various possibilities of use to mentioning tools and opportunities for businesses. Based on the analysis of the marketing communication of the examined brands and pieces of information gathered from the theoretical part, the final part of the thesis contains a summary of methods and tips that should lead to being able to use the Instagram platform as a successful marketing tool.Bakalářská práce pojednává o marketingovém využití sociální sítě Instagram. Hlavní cíl práce je kladen na sestavení optimálních zásad a doporučení, jak tuto platformu v rámci marketingové komunikace vhodně využívat. Úvodní část práce je věnována teoretickému představení online marketingu, který je posléze zaměřen na marketing na sociálních sítích. Další část představuje aplikaci Instagram, a to od prvotního seznámení s jejími funkcemi a možnostmi až po vytyčení nástrojů a uplatnění této platformy pro firemní užití. Na základě analýzy prováděné komunikace zkoumaných značek a poznatků nabytých v teoretické části je na závěr práce uvedeno shrnutí postupů a tipů, jež by měly vést k úspěšnému uchopení sítě Instagram jakožto marketingového nástroje