نتایج جستجو برای: including benzene
تعداد نتایج: 991227 فیلتر نتایج به سال:
Benzene is one of the basic building blocks of organic molecules. One of the reasons for benzene’s ubiquity is its unusual ring structure first discovered by Kekulé in 1865. In this paper, we show that a simple symmetry-based analysis can narrow down possible benzene structures to three ring ones, including the Kekulé’s ring. Thus, Kekulé’s benzene structure provides a good pedagogical example ...
background: medicinal plant extracts such as those obtained from salvia species have a wide variety of chemical compounds in their essential oils. the repellency of a number of essential oils including those from the labiates like salvia against several insect species including the common house flies is reported. objective: the aim of this investigation was to find out the excito-repellency eff...
this paper focuses on the effects of the addition of an ionic liquid, 1-allyl-3-butylimidazilium bis(trifluoromethane sulfonyl)imide ([abim]tfsi), which has a high affinity for benzene, into the poly(vinyl chloride) (pvc) membrane on the pervaporation characteristics of the removal of benzene from aqueous solutions of dilute benzene. when aqueous solutions of 100～500 ppm benzene were permeated ...
The title compound (systematic name: benzene-4,4',4'',4''',4'''',4'''''-hexaylhexabenzonitrile dichloromethane disolvate), C48H24N6.2CH2Cl2, crystallizes as an inclusion compound during the slow diffusion of methanol into a solution of hexakis(4-cyanophenyl)benzene in CH2Cl2. The hexakis(4-cyanophenyl)benzene molecule lies on an axis of twofold rotation in the space group Pbcn. Weak C-H...N int...
BACKGROUND Chronic exposure to high concentrations of benzene is usually associated with the development of haematological diseases. However, solid tumors induced by benzene exposure are less frequent. CASE PRESENTATION We present an unusual case of triple synchronous primary malignancies most likely induced by occupational benzene exposure in a male patient. This spray painter was diagnosed ...
Background: Volatile organic compounds (VOCs), including carcinogens and toxic compounds, are produced in petrochemical industries. We undertook this study in order to study workers’ respiratory exposure to different VOC concentrations and compare the results with the urinary levels of its metabolites and study the correlation between them in petrochemical industries. Materials and Met...
backgrounds and aims: semi automated processes of iranian tire manufacturing factories lead to significant occupational exposures to benzene and toluene compounds. this study was conducted to evaluate the magnitude and risk of workers exposures. materials and methods: personal monitoring of 100 workers (10 groups) was performed using niosh method no.1501 in two tire manufacturing factories in t...
Benzene represents an ubiquitous pollutant both in the workplace and in the general environment. Health risk and stress posed by benzene have long been a concern because of the carcinogenic effects of the compound which was classified as a Group 1 carcinogen to humans and animals. There is a close correlation between leukemia, especially acute myeloid leukemia, and benzene exposure. In addition...
Adsorption of benzene and cyclohexane on ®arious Y-zeolites was in®estigated to de®elop sorbents for the purification of aliphatics by remo®al of aromatics. Ag-Y showed superior benzenercyclohexane selecti®ities to Na-Y, Pd-Y, and H-USY. Separation factors greater than 10 5 were obtained with Ag-Y at low concentrations of benzene. High selecti®ities were achie®ed by the strong interaction betwe...
We present a validation study of a quantitative retrospective exposure assessment method used in a follow-up study of workers exposed to benzene. Assessment of exposure to benzene was carried out in 672 factories in 12 cities in China. Historical exposure data were collected for 3179 unique job titles. The basic unit for exposure assessment was a factory/work unit/job title combination over sev...
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