METHODS FOR THE MANUFACTURE OF ACETALS AND KETALS, AND THE ACETALS AND KETALS PRODUCED THEREBY
申请人:Mullen Brian D.
公开号:US20120035376A1
公开(公告)日:2012-02-09
A method for producing a product that comprises glycerol ketal of ethyl levulinate or propylene glycol ketal of ethyl levulinate comprises reacting either glycerol or propylene glycol with ethyl levulinate in the presence of a homogenous or heterogeneous catalyst system in a reactor system. The ethyl levulinate and either glycerol or propylene glycol are heated to remove water, polyol, and excess ethyl levulinate. The excess ethyl levulinate and polyol is recycled back to the reactor. The product is distilled in a specific fashion and optionally treated by means of a stabilizing agent or acid species removal bed, to obtain a composition comprising glycerol ketal of ethyl levulinate or propylene glycol ketal of ethyl levulinate wherein the composition comprises less than or equal to about 2 wt % contaminants.
Trimethylpentane-containing passive samplers for predicting time-integrated concentrations of pesticides in water: Laboratory and field studies
作者:Alex W. Leonard、Ross V. Hyne、Fleur Pablo
DOI:10.1002/etc.5620211210
日期:2002.12
half-lives for release of these pesticides from the TRIMPS varied from 26 to 130 d in clean water. The relatively polar pesticides with a log K(ow) < 3.5 had lower uptake rates into the TRIMPS because of their affinity for water. Release of trimethylpentane from the TRIMPS placed in 0.85-mm mesh nylon bags in river water was used as an indicator for chemical diffusion across the aqueous boundary to examine
ALTERNATE MORPHEEIN FORMS OF ALLOSTERIC PROTEINS AS A TARGET FOR THE DEVELOPMENT OF BIOACTIVE MOLECULES
申请人:Jaffe Eileen K.
公开号:US20090048324A1
公开(公告)日:2009-02-19
A composition having an agent adapted to affect a multimeric protein by binding to a binding site of the multimeric protein and thereby affecting an equilibrium of units, wherein the multimeric protein has an assembly having a plurality of said units, wherein each of the units has a first complementary surface and a second complementary surface and wherein the first complementary surface of one unit is associated with the second complementary surface of another unit, provided that the assembly is at least one of different quaternary isoforms on a condition that in the multimeric protein (1) a structure of each of the units determines a structure of the different quaternary isoforms, (2) the units are in the equilibrium and (3) the structure of the different quaternary isoforms influences a function of the multimeric protein.
There is described an apparatus for measuring protein characteristics comprising an X-ray fluorescence (XRF) spectrometer comprising a source of polychromatic X-rays, an X-ray detector, a protein, a molecule that has been exposed to and at least weakly binds to the protein, a plurality of X-ray fluorescence signal data obtained by irradiating chemical elements in the protein and molecule with the polychromatic X-rays and a security system for maintaining records for the data from the plurality of X-ray fluorescence signal measurements. There is also described an x-ray microscope for measuring a sample.
描述了一种测量蛋白质特性的仪器,该仪器包括一个 X 射线荧光 (XRF) 光谱仪,其中包括一个多色 X 射线源、一个 X 射线探测器、一个蛋白质、一个已暴露于该蛋白质并至少与该蛋白质弱结合的分子、通过用多色 X 射线照射蛋白质和分子中的化学元素而获得的多个 X 射线荧光信号数据,以及一个用于维护多个 X 射线荧光信号测量数据记录的安全系统。此外,还介绍了一种用于测量样品的 X 射线显微镜。