Search results for " Conversion"

The Role Played by Ionic Liquids in Carbohydrates Conversion into 5-Hydroxymethylfurfural: A Recent Overview

2022

Obtaining industrially relevant products from abundant, cheap, renewable, and low-impacting sources such as lignocellulosic biomass, is a key step in reducing consumption of raw fossil materials and, consequently, the environmental footprint of such processes. In this regard, a molecule that is similar to 5-hydroxymethylfurfural (5-HMF) plays a pivotal role, since it can be produced from lignocellulosic biomass and gives synthetic access to a broad range of industrially important products and polymers. Recently, ionic liquids (ILs) have emerged as suitable solvents for the conversion of biomass and carbohydrates into 5-HMF. Herein, we provide a bird’s-eye view on recent achievements about t…

Desiderio, crudeltà e conversione nell’«Agnes» di Rosvita di Gandersheim

2015

In her last hagiographical poem, «Agnes», Hrotsvit of Gandersheim (935-973) elaborates in 459 rhymed hexameters a story already told in many hagiographical an hymnological texts, the story of young roman virgin Agnes (it was told by pope Damasus, Prudentius, Ambrosius, Beda, and the anonymous «Passio Agnetis»). The paper presents and analizes Hrotsvit’s «Agnes» in his literary, historical, hagiographical, religious components and particularly insists on the themes of “desire”, “cruelty”, “conversion” and “martyrdom” which occur in it.

Research on conversion of Carrizo citrange [C. sinensis (L.) Osb. × P. trifoliata (L.) Raf.] synthetic seeds.

2008

Fe-doped Beta zeolite from organotemplate-free synthesis for NH3-SCR of NOx

2016

Two types of Beta zeolites, one from organotemplate-free synthesis with a Si/Al ratio of 9 and the other from a commercial one with a Si/Al ratio of 19, were employed here to dope Fe for NH3-SCR of NOx. Fe-Beta (Si/Al = 9) exhibits much higher activity than Fe-Beta (Si/Al = 19), especially at low-temperature regions (<250 °C). In addition, it also exhibits better hydrothermal stability as compared with Fe-Beta (Si/Al = 19), which demonstrates that it is a promising SCR catalyst with good activity as well as hydrothermal stability. The correlation between the quantitative calculation of the content of isolated Fe3+ in Beta zeolites and the NO conversion rate at 150 °C shows a linear relation…

Ionic liquid binary mixtures: Promising reaction media for carbohydrate conversion into 5-hydroxymethylfurfural

2014

Abstract The conversion of carbohydrates into 5-hydroxymethylfurfural (5-HMF) has been studied in binary mixtures of ionic liquids (ILs), using strongly acidic resin Amberlyst 15 as the catalyst. In particular, both mono- and disaccharides, such as fructose, glucose and sucrose have been investigated. Considering the favorable effect exerted by chloride-based ionic liquids in the dissolution of carbohydrates, we used binary mixtures of 1-butyl-3-methylimidazolium chloride ([bmim][Cl]) with [bmim + ] based ionic liquids differing in size, shape and coordination ability of the anion ([bmim][BF 4 ], [bmim][N(CF 3 SO 2 ) 2 ], [bmim][N(CN) 2 ], [bmim][SbF 6 ] and [bmim][CF 3 SO 3 ]). Carbohydrat…

The adoption of the Euro by Romania

2013

As Romania has joined the European Union, the European currency must be adopted even though it may raise some problems regarding conversion, the impact on goods and services expenses on the interior market having a direct effect on the population and the national economy because we don’t know which the trajectory of the Euro will be. This paper takes a look at the advantages and disadvantages of the adoption of the unique currency in our country taking into account the time factor and the behaviour we must have regarding the Euro, establishing the issues we must take a close look at when the initial term of adoption must be respected.

Jak pozostać sobą w obcym języku? Strategie konwersji językowej pisarzy pochodzenia słowiańskiego

2017

Ihe article is dcvoted to writers who after emigrating decided to change the language in which they wrote their books from their native language to the language of the country which became their second home. The strategies which are described in the article are determined by the personal experiences of the writers, for whom the choice of a second language in which their works were to be written became an opportunity to express various attitudes. Piotr Rawicz, a Jew of Polish origin, treated his literary debut - the novel Le sang du ciel, written in French - as an autobiography, which was expressed not in a direct manner but in a manncr based on intermediation of both the complex narrative d…

Efficiency of acetic acid and formic acid as a catalyst in catalytical and mechanocatalytical pretreatment of barley straw

2016

In this study, the potential of organic acids (formic acid, acetic acid) in a catalytical and mechanocatalytic conversion of lignocellulosic barley straw to valuable sugars is explored using sulfuric acid as a reference. Acid-catalyzed hydrolysis has been carried out with acid-impregnated samples as well as unmodified barley straw. In the mechanocatalytical approach, pretreatment consists of impregnation with the acid catalyst and mechanical treatment by ball milling following chemical hydrolysis. Straw samples and residues were analyzed by Fourier transform infrared spectrometry (FT-IR) whereas hydrolysate analysis was based on total reducing sugar (TRS) determination following the DNS met…

Behaviour influences cholesterol plasma levels in a pig model

2012

Little is known about the relationship between feed intake behaviour and cholesterol levels in humans. This can be attributed to the fact that feed intake behaviour in humans is difficult to assess. The relationships between feed intake, feed efficiency and feed intake behaviour, and cholesterol and triglyceride levels were investigated at an average age of 187 days, in a pig model consisting of 202 Duroc barrows. Feed intake and feed intake behaviour were recorded individually and daily by means of an electronic identification system. Animals with high levels of total cholesterol also had high levels of high-density lipoprotein (HDL), low-density lipoprotein (LDL) cholesterol and triglycer…

Compensatory growth in juvenile rainbow trout, Oncorhynchus mykiss (Walbaum), held individually

2004

Abstract The effect of feed cycling on compensatory growth was examined in juvenile rainbow trout, Oncorhynchus mykiss (Walbaum), held individually at 15 °C. Fish were fasted for 2, 4, 8, or 14 days and then refed until either their relative feed intake differed by less than 10% of fed controls, or the duration of the refeeding period was four times the fasting period. After 80 days, fish fasted for 8 days at a time were smaller than controls, or fish experiencing 2 or 4 days of fasting, while fish fasted for 14 days did not differ from other groups. There were no differences in visceral fat or hepatosomatic indices, but within-treatment variation was high. Fish subjected to fasting display…