The purpose of this paper was to analyze palm oil biodiesel production under different conditions and verify the relationships between variables in order optimize biofuel using response surface methodology (RSM). Biodiesel produced through transesterification process by methyl route alkali catalyst (NaOH) 1% (m/m). analyzed were: four molar ratios (3:1, 4:1, 6:1 8:1); three temperature reaction...

OBJECTIVE To evaluate our unit's theatre throughput efficiency, to identify where inefficiencies existed and consequently where the greatest improvement might be made.To identify the causes of day of surgery cancellations and how they might be avoided.  PATIENTS AND METHODS A prospective audit of theatre utilisation was undertaken over a 6 month period between 05/02//2013 and 02/08/2013 at Ip...

Antioxidant, anti-glycation and anti-inflammatory activities of fresh and conserved peach fruits (Prunus persica L. Batsch) were compared. Fresh peach pulps, peels, preserve peach pulps and the preserve syrup were prepared at equal concentrations. Rat liver, kidney and brain cortex tissue slices were pre-incubated with peach samples, subjected to oxidative stress with FeSO4 and hydrogen peroxid...

Untreated and hot-water-extracted (HWE) Norway spruce (Picea abies) sawdust was cooked using the sulfur-free oxygen-alkali (OA) method under the following conditions: temperature, 170 °C; liquor-to-wood ratio, 5:1 L/kg; and NaOH charge, 19% on the oven-dry sawdust. In comparison with earlier studies conducted with birch sawdust, the spruce cooking yield data, together with the amount of the pul...

Microbial dissimilatory iron reduction (DIR) is widespread in anaerobic sediments and is a key producer of aqueous Fe(II) in suboxic sediments that contain reactive ferric oxides. Previous studies have shown that DIR produces some of the largest natural fractionations of stable Fe isotopes, although the mechanism of this isotopic fractionation is not yet well understood. Here we compare Fe isot...

FeCO3 cement can be produced by reacting CO2(aq) and particulate-Fe(0). Process conditions solution compositions influence properties through kinetics of Fe-dissolution FeCO3-precipitation. This study investigates in dilute systems (water(wt.)/Fe(wt.) = 1000) at 30/60 °C, 1/10 barg CO2-pressures. Experimentally, time-evolution composition shows increased [Fe] solution-pH. As a proxy for high-pr...

Enzymatic treatment of different sulphite pulps with cellulases has been studied in this work. Endoglucanases were shown to beneficially alter the properties of both paper-grade and dissolving-grade pulps. In the case of the paper-grade pulp, the treatment with endoglucanase resulted in a considerable reduction of the pulp refining time without decrease in strength properties. While for the dis...