In the present study, new fluorophores based on disubstituted benzanthrone derivatives were designed starting from 9-nitro-3-bromobenzanthrone with nucleophilic substitution of bromine atom some secondary cyclic amines. It has been found that this reaction is positively affected by presence a nitro group in comparison 3-bromobenzanthrone. The compounds exhibit intense absorption and pronounced luminescent properties various organic solvents. regard, their photophysical evaluated an...

Abstract In the present study a new luminescent dye 3‐ N ‐(2‐pyrrolidinylacetamido)benzanthrone (AZR) was synthesized. Spectroscopic measurements of novel benzanthrone 3‐aminoderivative were performed in seven organic solvents showing strong fluorescence. The capability prepared for visualization has been tested on flax, red clover and alfalfa to determinate embryo plant callus tissue cultures. Callus cells stained with AZR further analysed utilizing confocal laser scanning fluorescence...

Abstract Gasification is one of the most promising techniques proposed for production energy from biomass. producing synthesis gas regarded as reasonable options utilising biomass produces a raw mixture containing tar, among other components. Traditional methods tar sampling are based on cold solvent-trapping coupled with solvent absorption in impingers. The present work focusses solid-phase adsorption method determining concentration compounds. A modified device consisting 500 mg...

The roundworms of Trichinella genus are worldwide distributed and their prevalence in nature is high. parasites the causative agents foodborne zoonosis trichinellosis. main prevention control infection meat inspection by magnetic stirrer method for detection larvae muscle samples. treatment can be effective if parasite discovered early intestinal phase. Once larva has reached tissue, remains therein there no this life cycle stage. species dioecious with separate male female individuals....

Benzanthrone derivates are now widely used in many industrial and scientific applications as dyes for polymers textiles. In biochemical, biomedical diagnostics investigations benzanthrone a lipophilic fluorescent probe since demonstrate bright fluorescence they have ability to intercalate between membrane lipids. The aim of research presented here was assess the luminescence derivatives using microscopic visualization biological objects. Accordingly, specimens freshwater trematodes:...

The four-cyclic condensed aromatic ketone 7H-benz[de]anthracene-7-one and its derivatives belong to the class of important anthraquinoid dyes, including laser luminescent dyes. Current work is devoted synthesis 3-cyanobenzanthrone evaluation being a useful precursor for obtaining new 3-substituted with heterocyclic moieties, handful which have been synthesized up now. photophysical properties prepared compounds are investigated. pronounced fluorescence fluorescent "turn-off" probes acidic...

One of devices for removing char from syngas is a cloth-based filter. Char mainly carbon black which good adsorbent and can be used tar syngas. When the latter passes through filter, accumulates in it adsorbs tar. In order to study effectiveness this way tar, samples further analysis were taken twice, before after filter with char. A solid-phase adsorption (SPA) method determining concentration compounds has been chosen. The research showed that proved quite cheap effective Concentration...

Nitrogen isotope ratio of nitrate provides a powerful tool to investigate sources and cycling mechanisms. Although the use an method for 15N/14N allows identifying in rivers by estimating seasonal variation N-NO3 concentration, however, there are some restrictions. Nitrification, conversion NH4+ NO3-, can proceed with significant nitrogen fractionation, preferentially accumulating 14N produced make it difficult identify source high proportion δ15N. However, uptake assimilation NO3- have...

The present work describes the synthesis of new benzanthrone dye-3-[4-(2-phenylethyl)piperazin-1-yl]-7H-benzo[de]anthracen-7-one by bromine atom nucleophilic substitution reaction. structure obtained derivative is characterized NMR spectroscopy, mass spectrometry, and X-ray diffraction analysis. photophysical properties target compound are investigated means UV-Vis fluorescence spectroscopy in various organic solvents.

The research explores the possibilities of biogas extraction from aquaculture waste. Samples fish-farming pool sludge were taken a fish farm, which is located in Krāslava district, Kalnieši rural municipality. Prior to experimental fermentation and biogas, samples analyzed order determine their moisture organic matter content (OMC). For purpose increasing OMC available for fermentation, was mixed with crushed reeds. Biogas obtained at various ratios reed residues. During experiments, 3.81...

Pyrolysis converts waste and also produces useful by-products. In this case, gas, liquid, solid phases are formed. The gas mixture contains tar, among other components. Water scrubbing technology is used to purify pyrolytic gas. disadvantage of that the tar components gradually accumulate in water. compounds most exposed process readily soluble light heterocyclic aromatic heavy polyaromatic compounds. Some compounds−the content which usually very high gas−are present small amounts cooling...

The research summarizes information on biochemical processes of biogas production and the parameters that affect results its production. examines result obtaining from bog sludge a mixture crushed reed. Particular attention is given to temperature, as parameter affects methane production.The yield during bioprocess depends effect temperature. During experiment, 2.78 L with an average content 38.7% was obtained reeds. If organic compounds in higher, would increase process. It more...

The Daugava or Zapadnaya (Western) Dvina River belongs to the Baltic Sea basin. length of river is 1,005 km with a drainage area 87,900 km<sup>2</sup>. It crosses three countries: Russia (323 and 18,500 km<sup>2</sup>), Belarus (328 33,100 km<sup>2</sup>) Latvia (352 24,700 km<sup>2</sup>). Water samples were collected at points following coordinates: Kraslava, Daugavpils, Riga distance from mouth 320, 255, 20 respectively. Discharge...

The main issue associated with the disposal of old tires is that they contain harmful chemicals and heavy metals can contaminate environment as break down. One solution to this problem use a process known pyrolysis, which breaks down produces useful by-products. This results in formation gas, liquid, solid phases, gas containing tar other components. In study, we employed method solid-phase adsorption determine concentration compounds. A specific sampling device using an amino-phase sorbent...

The research looks into the potential of generating biogas from waste generated by aquaculture. EDF-5.4_2 bioreactor, produced "Biotehniskais centrs" (Latvia), was utilized for experimental study. Samples sludge a fish farm located in Nagļu parish, Rēzekne district were collected and analysed their moisture organic matter content before being mixed with crushed reeds to increase available fermentation extraction.In this study, mixing different ratios reed residue. yield varied based on...

The purpose of this study is to examine the effectiveness a solid-phase adsorption method for measuring concentrations tar compounds in biomass. This involves collecting tars on column with an amino-phase sorbent. However, because biomass has high concentration volatile organic compounds, not all them can be collected just one column. Therefore, researchers decided add second different adsorbent improve accuracy measurement. They also chose test three sorbents (Carbopack B, Carbotrap, and...