Both the cis and trans isomers show insecticidal activity, but have differing mammalian toxicities, with the cis isomers being more potent (Ray 1991). (cdc.gov)
2-Carbomethoxy-1-methylvinyl dimethyl phosphate, Mevinphos [Note: Commercial product is a mixture of the cis- & trans-isomers. (cdc.gov)
Methyl1
The source substance, geraniol and it's isomer, consist of a C8 carbon backbone, methyl substituents at C3 and C7, two double bonds and a hydroxyl group. (europa.eu)
Acid5
It has a medium to low glass transition temperature of -3 °C. Chemically, it is a mixture of isomeric vinyl esters of neodecanoic acid. (wikipedia.org)
Disposition of perfluorinated acid isomers in Sprague-Dawley rats: part 1: single dose. (cdc.gov)
A new irrigating solution, MTAD, contains a mixture of a tetracycline isomer, an acid and a detergent. (bvsalud.org)
The most common CLA isomer contained in these products is cis -9, trans -11, which can be commercially synthesized from linoleic acid-rich oils and prepared as a 50% mixture with the trans -10, cis -12 isomer. (medscape.com)
Ether1
The isomers 4a - b , characterized by 1 H NMR (Table 2 ), were obtained by addition reaction of iodine to silyl enol ether [ 6 ] derived from 2-pyrrolidinone( 1 ) (Scheme 1 ). (hindawi.com)
Behavior1
In the case of the perhalogenated compounds (CFC-113, CFC-114, and their isomers), the solubility behavior between isomers in the ionic liquid is practically identical with large immiscibility gaps. (acs.org)
Isomerism1
Hydrolyzed by alkali Optical Vamidothion consists of a mixture of optically isomerism: active isomers. (inchem.org)
Chemical4
Some chemicals listed in this database or not pure chemical compounds, rather they are mixtures/solutions of chemicals. (environmentalchemistry.com)
For each chemical (PFOS and PFOA), the sum of the branched and linear isomers is calculated for each individual NHANES participant. (cdc.gov)
Isomers are formed with the same chemical formula but with different characteristics. (webmd.com)
Because zeolites are inorganic, they have excellent thermal stability and chemical resistance making them an ideal material as membranes for the separation of gas mixtures in a variety of applications. (mrs.org)
Geometric1
Following an initial work on the isolation of a single geometric isomer from an indene-C 70 bisadduct (IC 70 BA) mixture, we report the full fractionation and identification of the bisadduct species in the material. (beilstein-journals.org)
Substances2
2010. Isomer profiling of perfluorinated substances as a tool for source tracking: a review of early findings and future applications. (cdc.gov)
This proof of concept study shows that a HR GC fractionation collection platform was successfully applied to separate, purify, and enrich isomers in complex substances from a whole GC chromatogram, which would facilitate NMR analysis. (bvsalud.org)
Separation2
Ionic Liquid Selection for the Separation of Refrigerant Mixtures Using Extractive Distillation. (acs.org)
We processed ultramicroporous silica membranes with reproducible high permeances and high separation factors (3 x 10 -4 cm 3 (STP)/s/cm 2 /cmHg and 160, respectively) exceeding that of the best-known membranes for separation of a 50/50 (v/v) CO 2 /CH 4 gas mixture. (mrs.org)
Tert2
The viscosity of NaI solutions at concentrations of 0.5, 1.0 and 2.0 moles of electrolyte per 100 moles of the mixed solvent has been measured within the whole composition range of the mixtures of water with isobutanol, sec-butanol at 298.15 K and with tert-butanol at 299.15 K. (lodz.pl)
At the 1 H NMR spectrum of 3 , signals were detected relative to two isomers in the proportion (10 : 1) measured by integrals relative to methyls of the groups tert -butoxycarbonyl at δ 1.52 (major isomer) and δ 1.43 (minor isomer). (hindawi.com)
Consist1
DNTs consist of a mixture of isomers (forms). (cdc.gov)
Temperature2
However, we verified a larger proportion of the thermodynamic isomer 4b in relation to the kinetic isomer 4a previously obtained at low temperature in the experiment described in Scheme 1 . (hindawi.com)
Single gas and binary mixture permeances were measured as functions of temperature and pressure with pressure drop as the driving force for diffusion (i.e. no sweep gas was used). (mrs.org)
Molecular1
These particular isomers have the same molecular weight and molecular formula and the same nitro functional groups. (cdc.gov)
Compound1
With the exception of deltamethrin, pyrethroids are a complex mixture of isomers rather than one single pure compound. (cdc.gov)
Chemicals1
The linear isomers of PFOS ( n -PFOS) and PFOA ( n -PFOA) are single chemicals. (cdc.gov)
Pure2
A number of fractions contained relatively pure isomer species and their configuration were deduced using a variety of analytical techniques including 1 H and 13 C NMR and UV-vis spectroscopy. (beilstein-journals.org)
Geraniol is a pure form of the E-isomer. (europa.eu)
Exposure3
In some cases, measurement of the two isomers provides information that is helpful for evaluating exposure source contributions (Benskin et al, 2010, 2009b). (cdc.gov)
Recent studies of chronic effects in animals indicate that cancer is associated with exposure to commercial-grade TDI (an 80:20 mixture of 2,4- and 2,6-TDI) and 2,4-TDA, a hydrolysis product of TDI. (cdc.gov)
Although the carcinogenic potential of the other TDI and TDA isomers has not been adequately determined, exposure to all TDI and TDA isomers should be reduced. (cdc.gov)
Total3
At the spectrum of product from experiment 3, where the reaction was accomplished with heating, we verified the absence of signal relative to hydrogen C3-H of the isomer 4a indicating total isomerization of 4a to 4b . (hindawi.com)
Whereas we directly measured and reported serum total PFOS and PFOA prior to 2013, beginning with NHANES 2013-14 we began measuring linear and branched isomers of serum PFOS and PFOA and summing them to arrive at total PFOS and PFOA. (cdc.gov)
This calculated sum of PFOS (or PFOA) isomers is comparable to the total PFOS (or PFOA) that we reported previously. (cdc.gov)
Oils1
Supplements made from these oils have a different mixture of isomers than naturally occurring CLA. (webmd.com)
Body1
Measurement of the two types of isomers is informative because branched isomers may be eliminated from the body more rapidly than linear isomers (Benskin et al, 2009a). (cdc.gov)
Optical1
The substance is an equimolar mixture of two optical isomers (enantiomers). (europa.eu)
Standards2
Typically with GC- or liquid chromatography-mass spectrometry analysis, (isomer) standards and/or additional NMR analysis are needed to confirm the identification and/or structure of the analyte of interest. (bvsalud.org)
UVCBs), isomer standards are often unavailable and NMR spectra too complex to achieve this. (bvsalud.org)
Show1
However, the monohydrogen substituted halocarbons (HCFC-123, HCFC-124, and their isomers) begin to show some difference (liquid−liquid immiscibility gap) in the ionic liquid. (acs.org)
Difference1
The only difference between the isomers is the position of the first double bond. (europa.eu)
Effects1
The effects of chronic inhalation of a hexane (110543) mixture of 6 carbon (C-6) isomers free of n-hexane were examined. (cdc.gov)
Source1
The source substance, geraniol and nerol, is a multi-constituent substance of E/Z isomers (EC No. 906-125-5). (europa.eu)
The isomer effect on the solubility in the ionic liquid becomes significant for the dihydrogen-substituted halocarbons (HFC-134 and HFC-134a), and these isomers can be separated using [emim][Tf 2 N] as an entrainer in an extractive distillation. (acs.org)
Produce2
The decision to measure linear and branched isomers relates to the processes historically used to produce PFOS and PFOA. (cdc.gov)
n-Hexane-"free" hexane mixture fails to produce nervous system damage. (cdc.gov)
Material1
The IC 70 BA material used in most reports consisted of a mixture of isomers [7-9] . (beilstein-journals.org)