The purpose of this study was to the growth struvite crystals from effect adding tartaric acid additives an aqueous solution containing Mg 2+ , NH4 + and PO4 3- with a molar ratio 1:1:1. results study, it found that more concentration additive added, got smaller rate constant was. By decreasing value rate, also decreased then became inhibited. On other hand, has potential be used as fertilizer....

This study presents the phenolic compounds profile of commercial Cornicabra virgin olive oils from five successive crop seasons (1995/1996 to 1999/2000; n = 97), determined by solid phase extraction reversed phase high-performance liquid chromatography (SPE RP-HPLC), and its relationship with oxidative stability, processing conditions, and a preliminary study on variety classification. The medi...

This study investigated the effects of magnetite nanoparticles (MNPs) various sizes (10.77, 20.5, and 29.3 nm), different concentrations (0.5, 1, 2 ppm) on growth production active constituents in Ginkgo biloba L callus. The best medium for callus proliferation was MS supplemented with 1 ppm naphthalene acetic acid (NAA), Kinetin, 0.5 MNPs a size 10 nm, which gave maximum fresh weight percentag...

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...

Inhaled nitric oxide (NO), at a concentration of 80 ppm, counters the increase in respiratory resistance (Rrs) induced by methacholine, but fails to prevent a reduction in lung compliance (Crs) in a rabbit model. This study reports the effects of 3, 30 and 300 ppm of inhaled NO. New Zealand White rabbits were intubated and mechanically ventilated with 30% oxygen during neurolept anaesthesia. Me...

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-...

The aim of this study was to evaluate the anti-erosive effects of different fluoride compounds and one tin compound in the context of the complex pathohistology of dentine erosion, with particular emphasis on the role of the organic portion. Samples were subjected to two experiments including erosive acid attacks (0.05 molar citric acid, pH 2.3; 6 x 2 min/day) and applications (6 x 2 min/day) o...

A better understanding of the inhibitory and and linolenic acids on pneumococci at a concenstimulating effects of fatty acids on the growth of tration of 40 ppm, whereas 200 ppm exerted a microorgankisms may contribute to a clearer bactericidal influence. Streptococci were someappreciation of some general nutritional probwhat more resistant; according to Walker (82) lems, such as: they were inh...

It has become increasingly well realized that laboratory simulations of air pollution risk assessment need to employ O(3) concentration profiles that more accurately mimic those encountered during summer daylight ambient air pollution episodes. The present study was designed to compare the pulmonary function and symptoms of breathing discomfort responses to a 6.6-h square-wave 0.08-ppm O(3) cha...