Search results for "salt"

Whole-Cell Biocatalysis in Seawater: New Halotolerant Yeast Strains for the Regio- and Stereoselectivity Reduction of 1-Phenylpropane-1,2-Dione in Sa…

2020

The application of green chemistry concepts in catalysis has considerably increased in recent years, and the interest in using sustainable solvents in the chemical industry is growing. One of the recent proposals to fall in line with this is to employ seawater as a solvent in biocatalytic processes. This involves selecting halotolerant strains capable of carrying out chemical conversions in the presence of the salt concentrations found in this solution. Recent studies by our group have revealed the interest in using strains belonging to Debaryomyces and Schwanniomyces for catalytic processes run in this medium. In the present work, we select other yeasts based on their halotolerance to wide…

Aportaciones de la herpetofauna al conocimiento de la paleobiología y paleoclimatología del tramo temporal Pleistoceno Superior y Holoceno de la Comu…

2022

El periodo Cuaternario se caracteriza climáticamente por la alternancia de fases glaciales e interglaciales, y, asociadas a ellas, importantes fluctuaciones de la línea de costa. Dado que este marco temporal es altamente relevante en el campo de la evolución humana y, por ello, gran parte de su estudio se ha centrado en esta temática; también lo es para entender diversos aspectos de la historia natural de otros grupos de vertebrados, como es el caso de los reptiles y anfibios. Hasta ahora son escasos los estudios del componente herpetológico de las faunas de vertebrados en el este de la península ibérica durante el Pleistoceno Superior y Holoceno, habiéndose centrado fundamentalmente este e…

Could halophilic archaea improve the traditional salted anchovies (Engraulis encrasicholus L) manufacture?

2008

Although initial interest on extremely halophilic archaea turned to their involvement in the spoilage of salted meat and fish products, studies on the occurrence of such microorganisms in food ecosystems have rarely been performed. During salted anchovies production, a traditional process used by Mediterranean fishermen to obtain a tender product with a specific pleasant aroma and taste, extremely halophilic archaea belonging to the Halobacteriaceae family are often isolated. In order to elucidate the influence of halobacteria in salting and curing of this product, an experimental manufacturing was performed according to a traditional procedure. Salt to be employed was artificially inoculat…

Biological properties of carotenoids extracted from Halobacterium halobium isolated from a Tunisian solar saltern

2013

Abstract Background Bioactive molecules have received increasing attention due to their nutraceutical attributes and anticancer, antioxidant, antiproliferative and apoptosis-inducing properties. This study aimed to investigate the biological properties of carotenoids extracted from Archaea. Methods Halophilic Archaea strains were isolated from the brine of a local crystallizer pond (TS7) of a solar saltern at Sfax, Tunisia. The most carotenoid-producing strain (M8) was investigated on heptoma cell line (HepG2), and its viability was assessed by the MTT-test. The cells were incubated with different sub-lethal extract rates, with carotenoid concentrations ranging from 0.2 to 1.5 μM. Antioxida…

Studi tassonomici sulle popolazioni italiane di Halocnemum strobilaceum (Amaranthaceae)

2012

Halocnemum strobilaceum (Pall.) Bieb. fu descritto da Pallas (1771) con il nome di Salicornia strobilacea su campioni provenienti dal Mar Caspio. Questo arbusto succulento fu successivamente segnalato per varie località costiere e dell’entroterra del Mediterraneo, dell’Europa orientale e dei territori interni dell’Asia Minore e centrale fino alla Mongolia. In passato vari autori hanno evidenziato che le popolazioni costiere del Mediterraneo risultano abbastanza differenziate dalle quelle dell’entroterra dei territori euro-asiatici, corrispondenti queste ultime alla specie sensu strictu. Le differenze riguardano soprattutto l’habitus, come pure alcuni rilevanti caratteri morfologici, già evi…

Bacterias halófilas moderadas aisladas de las minas salinas de Atacocha - Ayacucho

2007

Las bacterias halófilas producen una gran variedad de metabolitos y enzimas con interesantes aplicaciones bíotecnológicas. Con la finalidad de aislar bacterias halófilas moderadas de las minas salinas de Atacocha - Ayacucho, se recolectaron muestras de sal y se preenriquecieron en medio agua de sales al 5% suplementado con extracto de levadura al 0.5% durante una semana y luego se sembraron en medio sólido. De 40 aislados se seleccionaron 10 por presentar características morfológicas y culturales muy diferenciadas. A los aislados seleccionados se les determinó el rango de tolerancia al NaCl, temperatura, pH y sus características bioquímicas y nutricionales. Se encontró que los aislados tole…

Evaluation of proteolytic, lypolitic and decarboxylase activity of estremely halophilic bacteria occurring in ripening of salt anchovies.

2004

Thiazolium-­‐based catalysts for the etherification of benzylic alcohols under solvent-­free conditions

2015

In this work, thiazolium and imidazolium hybrid materials (SBA-15-Thia and SBA-15-Imi) were prepared by grafting the bis-vinylthiazolium or imidazolium salts onto thiol functionalized SBA-15 mesostructured silica. The catalytic activity was tested for the etherification of 1-phenylethanol, in heterogeneous conditions. The reactions were performed under different gas phases and reaction times. The SBA-15-Thia displayed an excellent catalytic performance, also with others benzyl alcohols. This material was successfully used in seven consecutive runs. Further studies were carried out in homogenous conditions. The results obtained allow proving that oxygen play an active role in the reaction pr…

Bio-based 1,3-diisobutyl imidazolium hydrogen oxalate [iBu 2 IM](HC 2 O 4 ) as CO 2 shuttle

2017

International audience; This manuscript describes the using of biosourced L-valine, oxalic acid and glyoxal to produce a biobased imidazolium hydrogen oxalate [iBu(2)IM](HC2O4) which is converted to its related hydrogen carbonate salt by a simple electrolysis without using strong base. The addition of weak protic acids to the latter compound leads to a rapid and quantitative CO2 release with formation of the starting hydrogen oxalate salt or a new halide free bio-based ionic liquid [iBu(2)IM](AcO) which is able to adsorb reversibly the CO2 at room temperature. The protonation reactions, combined with electrolysis, could then be a promising alternative solution for storage and transport of C…

Multi-Temporal Soil Salinity Assessment at a Detailed Scale for Discriminating Halophytes Distribution

2016

A multi-temporal survey of soil salinity in a salt lake, recolonized by halophytes, was performed using electromagnetic induction (EMI) providing volume integrated values of soil apparent electrical conductivity (ECa). Inventories of plant communities were recorded according to the Braun-Blanquet method. In each of six areas monospecific with Suaeda vermiculata, Suaeda vera, Sarcocornia fruticosa, or Arthrocnemun macrostachyum, ECa was measured intensively in two seasons. Mean and range of ECa differ for each plant community. Soil was sampled in the six areas and analyzed for ion composition of the soil saturated paste extract. The electrical conductivity of the saturated paste extract (ECe…