Search results for "liquid"
showing 10 items of 4351 documents
Biogas measurement techniques and the associated errors
2011
There are several techniques for the measurement of laboratory scale biogas production. This thesis describes the study and evaluation of the most significant and commonly used biogas measurement techniques and analyzes the source of errors associated with the measurement of biogas production. Firstly, inaccuracy mainly due to biogas carbon dioxide (CO₂) dilution in displaceable liquids and losses to atmosphere of dissolved CO₂ was evaluated by testing solubility of CO₂ in different barrier solutions. Saturated acidified brine solution showed lower CO₂ solubility among the tested solutions. An accurate, simple, automated and easy to calibrate laboratory scale liquid displacement gas measuri…
Qualitative screening of 116 veterinary drugs in feed by liquid chromatography-high resolution mass spectrometry: potential application to quantitati…
2014
Abstract Veterinarian and human pharmaceuticals may be intentionally added to animal feed to enhance animal production. Monitoring these substances is necessary for protecting the consumers. In this work, a screening method covering 116 human and veterinary drugs has been developed and validated in five types of animal feed at 0.02 and 0.2 mg kg−1. After a simple extraction and dilution, the samples were analysed by ultra-high performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (UHPLC-QTOF MS). Nearly all compounds tested were detected at 0.02 mg kg−1, based on the presence of the accurate-mass (de)protonated molecule. However, the identification using a…
Osmotic and cryoprotective effects of a mixture of DMSO and ethylene glycol on rabbit morulae.
1993
Abstract Comparisons were made of the osmotic and cryoprotective effects on rabbit embryos preserved by vitrification with 2 solutions and by conventional freezing. Embryos obtained from rabbits killed 70 to 72 h after mating were used in the study (n = 948). Initially, toxicity of the 3 cryoprotectants was studied in fresh (unfrozen) embryos (n = 135). Subsequently, embryos placed in ethylene glycol (EG, 40% v/v; n = 88) and ethylene glycol with dimethyl sulfoxide (EG+DMSO, 20% v/v each, respectively; n = 344) were loaded into straws and plunged directly into liquid nitrogen. Embryos placed in 1.5 M DMSO and 20% heat inactivated rabbit serum were subjected to conventional freezing in a pro…
Quantitative determination of casein genetic variants in goat milk: Application in Girgentana dairy goat breed
2016
The study was conducted to develop a high-performance liquid chromatographic (HPLC) method to quantify casein genetic variants (αs2-, β-, and κ-casein) in milk of homozygous individuals of Girgentana goat breed. For calibration experiments, pure genetic variants were extracted from individual milk samples of animals with known genotypes. The described HPLC approach was precise, accurate and highly suitable for quantification of goat casein genetic variants of homozygous individuals. The amount of each casein per allele was: αs2-casein A = 2.9 ± 0.8 g/L and F = 1.8 ± 0.4 g/L; β-casein C = 3.0 ± 0.8 g/L and C1 = 2.0 ± 0.7 g/L and κ-casein A = 1.6 ± 0.3 g/L and B = 1.1 ± 0.2 g/L. A good correl…
HPTLC fingerprinting—rapid method for the differentiation of honeys of different botanical origin based on the composition of the lipophilic fractions
2018
Bee honey possess various nutritional and medicinal functions, which are the result of its diverse chemical composition. The numerous bioactive compounds in honey come from flower nectar
Search for low-energy neutrinos from astrophysical sources with Borexino
2019
We report on searches for neutrinos and antineutrinos from astrophysical sources performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. Electron antineutrinos ($\bar{\nu}_e$) are detected in an organic liquid scintillator through the inverse $\beta$-decay reaction. In the present work we set model-independent upper limits in the energy range 1.8-16.8 MeV on neutrino fluxes from unknown sources that improve our previous results, on average, by a factor 2.5. Using the same data set, we first obtain experimental constraints on the diffuse supernova $\bar{\nu}_e$ fluxes in the previously unexplored region below 8 MeV. A search for $\bar{\nu}_e$ in the solar ne…
Antimicrobial and antioxidant supramolecular ionic liquid gels from biopolymer mixtures
2023
In this work, we describe the preparation and characterization of supramolecular ionic liquid gels based on binary mixtures of biopolymers, comprising chitosan, chitin, cellulose and lignin. The gels were obtained in ionic liquids differing in the cation or the anion, with no need for a cross-linking agent or acid treatment. The materials obtained were characterized for the minimum gelation concentration, porosity, swelling and rheological properties, finding a prominent influence of the nature of the ionic liquid anion. Then, we investigated the ability of the gels to scavenge free radicals, finding that the gels exhibit a higher antioxidant ability than their individual components. Moreov…
Propaganda polityczna w epoce płynnej nowoczesności : przypadek tureckiej serii filmów "Doliny Wilków"
2018
Celem tekstu je st analiza propagandowego aspektu tureckich filmów z serii Dolina Wilków, umieszczona w ramach Baumanowskiej kategorii płynności. Artykuł rozpoczyna się od naszkicowania istotnych cech płynnej nowoczesności. Potem przechodzi się do upolitycznienia filmów i zatarcia granicy między rzeczywistością a fikcją. Następnie zwraca się uwagę na kwestie ideologiczne, włącznie z neoosmanizmem, nacjonalizmem i antysemityzm em. Ostatnia część dotyczy głębokiego państwa (Deep State), szarej strefy między oficjalnymi instytucjami państwa a grupami terrorystycznymi i mafią.
The behaviour of trace elements during the volcanic ash-liquid interaction. Example of marine and human systems.
2011
I processi d’interazione solido-liquido sono alla base dei meccanismi che governano la disponibilità degli elementi in tracce in fase liquida. In questo lavoro tali processi sono stati studiati attraverso l’utilizzo degli elementi delle Terre Rare (REE) che come serie di elementi, per le loro peculiari caratteristiche sono degli ottimi traccianti di processi geochimici. Lo scopo della prima parte di questo lavoro è stato quello di studiare la reattività di un particolato vulcanico durante l’interazione con un’acqua marina sintetica. Tale indagine è stata effettuata attraverso esperimenti di tipo batch, per un periodo massimo di 6 mesi. Ulteriori indagini sono state effettuate aggiungendo Na…
ELEKTROMAGNĒTISKI IETEKMĒTU HIDRODINAMISKO PROCESU EKSPERIMENTĀLI PĒTĪJUMI ŠĶIDRU METĀLU NOSLĒGTOS TILPUMOS
2014
Elektroniskā versija nesatur pielikumus