Sensitivity of polymeric microdisks is evaluated for selected compounds in their vapor phase such as humidity, isopropanol, toluene, limonene, 1-butanol, and pentanoic acid (valeric acid). Among these compounds, exhibits the highest sensitivity (23 pm/ppm) with a limit detection estimated to be around 0.6 ppm. We are interested contribution geometry deformation due polymer swelling on it may en...

OBJECTIVES Laboratory technicians, students, and instructors are at high risk, because they deal with chemicals including formaldehyde. Thus, this preliminary study was conducted to measure the concentration of formaldehyde in the laboratories of the University of Sharjah in UAE. MATERIALS AND METHODS Thirty-two air samples were collected and analyzed for formaldehyde using National Institute...

Five organophosphates (OPs) (chlorpyrifos, chlorpyrifos methyl, fenthion, malathion, and temephos), 3 pyrethroids (bifenthrin, cypermethrin, and permethrin), and 2 microbial pesticides (Bacillus thuringiensis serovar.israelensis [B.t.i.] and Bacillus sphaericus) were tested as larvicides against a Florida Aedes albopictus population colonized in the laboratory. In addition, 3 insect growth regu...

One feeding trial and two balance studies were conducted to study the effects of adding arsanilic acid or vitamin E (E) upon utilization of natural or supplemental selenium (Se) (from sodium selenite) in the diet. Eighty weanling pigs were assigned at random to eight dietary treatments in a 23 factorial design. The basal corn-soybean meal diet (containing .036 ppm Se and 6 IU E/kg) was fed alon...

Bioassays for the carcinogenicity of nitrilotriacetic acid, trisodium salt, monohydrate (Na3-NTA-H2O) were conducted at Stanford Research Institute (SRI), using Fischer 344 rats and at Litton Bionetics, Inc. (LBI), using both Fischer 344 rats, and B6C3F1 mice. Similar bioassays using rats and mice, were conducted at LBI on the free acid, nitrilotriacetic acid (NTA). Each chemical was mixed in r...

A sensitive and selective kinetic-spectrophotometric method was developed for the determination of trace amounts of uric acid. The method is based on the inhibitory effect of uric acid on the oxidation of Janus Green by bromate in the presence of sulfuric acid. The reaction was followed spectrophotometrically by measuring the absorbance at 518 nm using the fixed-time method. Under optimum exper...

BACKGROUND Medicinal leech, Hirudo medicinalis, has been used in plastic and reconstructive surgery, to relieve venous congestion and to improve the microrevascularization of flaps. In many countries, wild leeches are still provided from local markets and utilised with antibiotic prophylaxies. In this research, results of identification of bacteria in the transport fluid is reported, oral and i...

tions: The methyl ester 4, preformed from 2 by chromic acid oxidation [4], yields the identical product 5 with uptake of one mole of diazo­ methane. The discharge of the yellow colour of the reactants 3, 4 indicates the disruption of the a,ßdiketo-chromophore by the action of the second molecule of diazomethane. Its incorporation as a spiro-oxirane ring at C-4 is indicated by the l3C NM R spect...

The purpose of this study was to investigate the therapeutic effects of propolis on biochemical and microbiological parameters in muscle tissues of carp (Cyprinus carpio, Linnaeus 1758) exposed to arsenic. A sublethal concentration of arsenic (0.01 ppm) and/or 0.01 ppm propolis were administered to fish for seven days. Biochemical parameters [pH, lactic acid, total volatile basic nitrogen (TVB-...

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...