Five sample digestion procedures were evaluated for the determination of Al, B, Ca, Cu, Fe, K, Mg, Mn, Na, P, S, Sr, and Zn in food samples by inductively coupled plasma atomic emission spectrometry. The 5 procedures include dry ashing at 500 degrees C, wet digestion with HNO3-HClO4, microwave digestion with HNO3, microwave digestion with HNO3-H2O2, and microwave digestion with HNO3-H2O2-HF. Fo...

Multi-element determination of trace elements in urine and dialysis solutions by atomic absorption spectrometry has been investigated. Coprecipitation with samarium hydroxide was used for preconcentration of trace elements and elimination of matrix elements. To 10 ml of each sample was added 500 mul of 2 mgml(-1) samarium solutions; the pH was then adjusted to 12.2 in order to collect trace hea...

Preconcentration of Cd in water has been carried out using Dowex 50WX2-200 resin as a solid phase extractor. The extraction process was with sonicator. Elution which adsorbed by the released again 1M HNO3, then measured Flame-Atomic Absorption Spectrophotometer. In this study, effects pH, sample solutian sonication time, elution time and eluent volume were studied. results optimization preconce...

Optimization of the culture medium for cellulase production using Trichoderma reesei was carried out. The optimization of cellulase production using mango peel as substrate was performed with statistical methodology based on experimental designs. The screening of nine nutrients for their influence on cellulase production is achieved using Plackett-Burman design. Avicel, soybean cake flour, KH(2...

Los barrenadores del tallo género Diatraea son plagas importantes en el cultivo maíz (Zea mays L.) debido a la dificultad que se tiene su manejo, ya éstas barrenan de planta y es difícil presenciar daño. hongos entomopatógenos constituyen una opción para manejo. Se evaluó patogenicidad dos cepas Beauveria bassiana (BbP 001 BbP 002) Metarhizium rileyi (MrP 001) con objetivo seleccionar más patog...

name Treatment Sample name Sample Treatment GSM831907 Nod-LCOs 6h roots biological replicate 1 GSM831910 Nod-LCOs 24h roots biological replicate 1 GSM831908 Nod-LCOs 6h roots biological replicate 2 GSM831911 Nod-LCOs 24h roots biological replicate 2 GSM831909 Nod-LCOs 6h roots biological replicate 3 GSM831912 Nod-LCOs 24h roots biological replicate 3 GSM831913 Nod-LCO control 6h roots biologica...

In this paper, the hemoglobin (Hb)-collagen microbelt modified electrode with three-dimensional configuration was fabricated via the electrospinning method. Direct electron transfer of the Hb immobilized into the electrospun collagen microbelts was greatly facilitated. The apparent heterogeneous electron transfer rate constant (k(s)) was calculated to be 270.6s⁻¹. The electrospun Hb-collagen mi...

The amiloride-sensitive Na + /H + antiporter in defolliculated oocytes of Xenopus laevis was characterized by measurements of H Na + influx and apparent H + efflux. Uptake of ^Na"" was linear over a 90-min incubation period and was inhibited approximately 80% with 5xlO~moll~ amiloride. Amiloride-sensitive sodium uptake was reduced following collagenase treatment or oocyte aging. Ko 5 for amilor...

In their study of a quartic integral, Boros and Moll discovered a special class of sequences, which is called the Boros–Moll sequences. In this paper, we consider the concavity and convexity of the Boros–Moll sequences {di(m)}i=0. We show that for any integer m > 6, there exist two positive integers t0(m) and t1(m) such that di(m)+di+2(m) > 2di+1(m) for i ∈ [0, t0(m)] ⋃ [t1(m),m−2] and di(m)+di...