in this study antioxidant activity of the red algae (hypnea hamulosa) was investigated in the invitro condition. the measurement included total phenolic content, ferric reducing power, dpph radical scavenging activity and total antioxidant activity. seaweed samples with the ratio of 1:20 (algae: solvent) were extracted using conventional solvent extraction method for 24 hours. the applied solve...

background: solvents, which are widely used in industry, are able to dissolve another substance for creating a solution. solvents have various effects on human health based on their type and chemical composition. methods: this was a cross-sectional study to investigate the harmful effects of solvents on wood painters in yazd city. to achieve information, a census questionnaire was prepared and ...

introduction: the purpose of this study was to evaluate the effect of different solvents; carbonic acid (h 2 co 3 ), hydrochloric acid (hcl), chlorhexidine (chx) and sodium hypochlorite (naocl) on the surface hardness of mineral trioxide aggregate (mta) and calcium-enriched mixture (cem) cement. methods and materials: plexiglass molds were prepared and filled with angelus mta or cem cement and ...

A new method is presented for mesoscopic simulations of particle dispersions in liquid crystal solvents. It allows efficient first-principle simulations of the dispersions involving many particles with many-body interactions mediated by the solvents. Demonstrations have been performed for the aggregation of colloid dispersions in two-dimensional nematic and smectic-C* solvents neglecting hydrod...

This paper presents results of the spectral (absorption and emission) and photophysical study of 6-aminocoumarin (6AC) in various aprotic hydrogen-bond forming solvents. It was established that solvent polarity as well as hydrogen-bonding ability influence solute properties. The hydrogen-bonding interactions between S1-electronic excited solute and solvent molecules were found to facilitate the...

Scientific literature addressing the association of industrial exposures to solvents with glomerular kidney disease is reviewed. The role of the practicing physician in taking an occupational history of exposures to solvents in every case of glomerulonephritis is emphasized. Based on case studies and epidemiologic findings, it is highly probable that exposures to industrial solvents should be c...

INTRODUCTION A number of studies on enzymatic reactions have been carried out in organic media. These reactions have several benefits compared with conventional organic synthesis, including high enantioselectivity, substrate specificity and low energy consumption. There are, however, several drawbacks in using organic solvents. Volatile organic solvents are often flammable and toxic to the envi...

The importance of aprotic solvents in studies of the electrochemistry of organic compounds is discussed and a general mechanism for the oxidation and reduction of aromatic hydrocarbons and related substances is presented. The effect of molecular structure on the electrochemical behaviour of organic compounds is illustrated by discussing the relationship between conformations of aryl-substituted...

While noise exposure is the most significant contributor to occupational hearing loss, evidence gained over the last 10 years, has pointed to organic solvents as additional contributors to occupational hearing disorders. Despite the implications of this finding, no significant measure has been undertaken to limit exposure to occupational solvents, or to occupational solvents and noise, within t...

Incidence rates for breast cancer have increased steadily over the last 25 years, particularly among postmenopausal women. Secular changes in accepted and suspected risk factors can explain only a part of this increase. Given the increasing number of women in the workforce, it is possible that increases in breast cancer incidence may be caused by occupational exposure to hazardous agents. In pa...