نتایج جستجو برای: 35 organic compounds

تعداد نتایج: 574896  

Journal: :Chemical reviews 2009
Robert S Blake Paul S Monks Andrew M Ellis

Proton-transfer reaction mass spectrometry (PTR-MS) is a technique developed almost exclusively for the detection of gaseous organic compounds in air. Volatile organic compounds (VOCs) in air have both natural and anthropogenic sources. Natural sources include the emission of organic gases by living objects, both plants and animals. A well-known example, which is discussed later in this review,...

Journal: :British journal of sports medicine 2010
C Blair J Walls N W Davies G A Jacobson

OBJECTIVE To determine if non-elite athletes undertaking short duration running exercise adjacent to a busy roadway experience increased blood levels of common pollutant volatile organic compounds (benzene, toluene, ethylbenzene and xylene (BTEX)). DESIGN AND SETTING The study was observational in design. Participants (nine males/one female non-elite athletes) ran for 20 min, near a busy road...

Journal: :Environmental pollution 2011
J R Simpson E G McPherson

Urban trees can produce a number of benefits, among them improved air quality. Biogenic volatile organic compounds (BVOCs) emitted by some species are ozone precursors. Modifying future tree planting to favor lower-emitting species can reduce these emissions and aid air management districts in meeting federally mandated emissions reductions for these compounds. Changes in BVOC emissions are cal...

Journal: :آب و خاک 0
زینب رحیمی محمد کافی

abstract in order to study the effects of salinity and silicon application on biomass of leaves and root of purslane (portulaca oleracea l.), a greenhouse experiment was conducted at research greenhouse of ferdowsi university of mashhad using completely randomized desgin with three replications. employed two factors consisted of three levels of salinity using nacl (0.6, 11, 22 ds/m) and two lev...

Journal: :mycologia iranica 0
m. shahiri tabarestani department of plant protection, faculty of plant production, gorgan university of agricultural sciences & natural resources, gorgan, iran & faculty of agricultural sciences, payame noor university, tehran, iran k. rahnama department of plant protection, faculty of plant production, gorgan university of agricultural sciences & natural resources, gorgan, iran m. jahanshahi nanotechnology research institute, school of chemical engineering, babol noshirvani university of technology, mazandaran, iran s. nasrollahnejad department of plant protection, faculty of plant production, gorgan university of agricultural sciences & natural resources, gorgan, iran m. h. fatemi faculty of chemistry, mazandaran university, babolsar, iran

fungi release wide spectrum of volatile organic compounds (vocs) that belong to several chemical groups with different biochemical origins such as monoterpenes, sesquiterpenes, alcohols, aldehydes, aromatic compounds, esters, furans, ketones, sulfur and nitrogen compounds. trichoderma species are the most studied fungal biocontrol agents and are successfully used as biofungicides and biofertili...

Journal: :journal of sciences, islamic republic of iran 2014
a.d. khalaji

two organic compounds (sc-23=(e)-2-cyano-3-(2,3-dimethoxyphenyl) acrylic acid and sc-25=(e)-2-cyano-3-(2,5-dimethoxyphenyl) acrylic acid) involving methoxy groups as the electron donor and cyanoacrylic acid group as the electron acceptor have been investigated for dye sensitized solar cells. they shows a short-circuit current density (jsc) of 2.08 and 1.81 ma cm-2, an open circuit voltage (voc)...

Journal: :pollution 2015
hamid reza eisaei seyed shaho ahmadi dehrashid mohammad reza khani seyed mukhtar hashemi

in this research, gasoline vapours including benzene, toluene, xylene (btx) and total volatile organic compounds (tvocs) emitted from vent pipes of underground storage tanks (usts) were measured at six gas stations in tehran. thereafter, gas station no. 29 was selected as a pilot station and equipped with a vapour control system. the vapours were measured during the summer of 2013 and winter of...

2011
Hinrich Grothe Philipp Baloh Fabian Weiss

Certain organic compounds have the potential to effectively alter water ice nucleation. Research data of those organic compounds that may affect ice formation in the atmopshere is still insufficient. Among those interesting compounds are the carboxylic acids which are present in the atmosphere due to different reasons. They are formed through ozonolysis of unsaturated organic compounds and are ...

2004
Kenneth S. Suslick Neal A. Rakow Avijit Sen

The development of colorimetric sensor arrays for the detection of volatile organic compounds is reported. Using an array of chemo-responsive dyes, enormous discriminatory power is created in a simple device that can imaged easily with an ordinary flat-bed scanner. High sensitivities (ppb) have been demonstrated for the detection of biologically important analytes, including amines, carboxylic ...

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