conclusions the results of this study show that lh in different pharmaceutical preparations could be determined with good reliability. in addition, the results reveal that the equal numbers of electrons and protons are involved in the oxidation of lh and the irreversible oxidation of an analyte was performed via amine groups of lh molecule. background lidocaine hydrochloride (lh) is one of the ...

Eggs, either dispersed or in masses, and second-stage juveniles (J2) of Meloidogyne incognita were exposed to different concentrations of ammonium ions in a nutrient agar medium upon which excised tomato roots were growing. Egg hatch and J2 penetration of the roots was slowed or inhibited at high (54 and 324 mg/liter) but not at low (1.5 and 9 mg/liter) concentrations of ammonium nitrate. The e...

Thallium (Tl) is a highly toxic heavy metal that poses threat to various organisms, including human beings. In plants, Tl mostly present as the uncomplexed Tl+ species, and its uptake by plants follows similar trend of other monovalent ions such NH4+, Cs+, K+, Rb+, others. this study, we investigated relationships between concentrations in barley sunflower extractable-Tl acidic, neutral, alkali...

OBJECTIVE Epidemiological studies suggest that green leafy vegetables, which are high in dietary nitrate, are protective against CVD such as stroke. High blood pressure (BP) is a major risk factor for stroke and inorganic nitrate has been shown to reduce BP. The objective of the present study was to test the hypothesis that diets containing high-nitrate (HN) vegetables would increase plasma nit...

awareness of the effects of fire on various aspects of an ecosystem after the fire,is important for range management. changes in soil physical and chemical propertiescaused by fire can be the cause of changes in the vegetation. in this study, effects of fire onphysical and chemical characteristics of soil were investigated. this research was carriedout in a randomized block design method in the...

Seed dormancy is a serious limiting factor in revenue of an economically important species to its fullest. Because of the importance of medicinal plants in curing diseases and the shortage of natural habitats, little reproduction rate and mass cutting of trees, it is necessary to program cultivation and naturalization of medicinal plants.  The objectives of this study were to investigate the ef...

Exposure of the leaf canopy of corn seedlings (Zea mays L.) to atmospheric CO(2) levels ranging from 100 to 800 mul/l decreased nitrate accumulation and nitrate reductase activity. Plants pretreated with CO(2) in the dark and maintained in an atmosphere containing 100 mul/l CO(2) accumulated 7-fold more nitrate and had 2-fold more nitrate reductase activity than plants exposed to 600 mul/l CO(2...

Although leaf expansion is obviously a fundamental process in the development of plants, its physiological mechanism is little understood, and has been but sparingly investigated. It is known that auxins affect the elongation of the leaf veins (1) but do not seem to influence the expansion of the laminar leaf tissues. BONNER et al. (3) observed an increase in expansion of radish leaf disks floa...