Sample Preparation for Determination of Biological Thiols by Liquid Chromatography and Electromigration Techniques

Wydrukowano z dostarczonych Wydawnictwu UŁ gotowych materiałówMajority of the bioanalytical or environmental methods do not use just one chromatografie or electrophoretic step, but rather involve several sample pretreatment steps which simplfy the matrix, and often preconcentrate and chemically modify the analytes. This work surveys typical procedures for sample preparation for most commonly analyzed biofluids with particular emphasis placed on chemical derivatization of sulfur amino acids for their determination by liquid phase separation techniques. Recent author's laboratory contribution to the development of sample preparation procedures is merked.Zadanie pt. Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej naukę

Conductometric Studies of 1-Ethyl-3-methylimidazolium Tetrafluoroborate and 1-Butyl-3-methylimidazolium Tetrafluoroborate in 1-Propanol at Temperatures from (283.15 to 318.15) K

The electrical conductances of dilute solutions of the ionic liquids 1-ethyl-3-methylimidazolium tetrafluoroborate [emim][BF4] and 1-butyl-3-methylimidazolium tetrafluoroborate [bmim][BF4] in 1-propanol have been measured in the temperature range from (283.15 to 308.15) K at 5 K intervals. The ionic association constant, KA, limiting molar conductances, Λo, and distance parameters, R, were obtained using the low concentration Chemical Model (lcCM). The examined electrolytes are strongly associated in 1-propanol in the whole temperature range. From the temperature dependence of the limiting molar conductivities the Eyring’s activation enthalpy of charge transport was estimated. The thermodynamic functions such as Gibbs energy, entropy, and enthalpy of the process of ion pair formation were calculated from the temperature dependence of the association constants

Development of an SPS/DPS hydrogen shrouded cryogenic helium storage system Summary report

Storag of helium gas at higher temperature and pressure using liquid hydrogen refrigerant to surround primary fluid within inner vesse

Relationships, Rigor, and Readiness: Strategies for Improving High Schools

This report offers lessons from the last in a series of three high school reform conferences sponsored by MDRC, the Council of the Great City Schools, and the National High School Alliance. This conference in June 2007 brought together leaders from 22 midsize school districts to describe their reform initiatives and to discuss ways in which research and evaluation can inform and complement school change

Direito à desconexão frente aos direitos e deveres do empregado no contrato de trabalho especificamente no teletrabalho

O presente artigo trata sobre o direito à desconexão ao teletrabalhador do seu trabalho habitual. O teletrabalho, conhecido como trabalho a distância, é elaborado com a utilização de equipamentos que permitem que o serviço efetivo possa ser realizado fora da empresa. Trata-se de pesquisa qualitativa, realizada por meio de método dedutivo e de procedimento técnico bibliográfico e documental. As reflexões partem de uma breve conceituação do contrato de trabalho, analisando as características e os elementos do contrato. Em seguida, explana sobre análise histórica do teletrabalho, conceitos, definições, classificações, vantagens e desvantagens, para, por fim, examinar se há o direito à desconexão do teletrabalhador, com base na dignidade e proteção do empregado, bem como a compatibilidade do trabalho a distância com relação à jornada de trabalho normal. Nesse sentido, conclui que mesmo o teletrabalhador não utilizando do espaço físico da empresa, existe garantias estabelecidas pela CLT e que não podem deixar de ser cumprida, que é o direito ao descanso, férias e lazer, proporcionando ao empregado o direito à desconexão do trabalho.CAPE