Cyanuric acid, used as chlorine stabilizer in swimming pool waters, has a relatively minor effect on the algicidal efficiency of free chlorine. The toxicity of free chlorine to three swimming pool algae was reduced slightly by 25 mg of cyanuric acid per liter if inhibiting, but less than algicidal, concentrations of chlorine were employed. Higher stabilizer concentrations (50, 100, and 200 mg/l...

We describe the preparation of a new substrate, N-gamma-L-glutamyl-5-aminoisophthalic acid dimethyl ester hydro-chloride, for the fluorometric determination of gamma-glutamyltransferase activity in serum by the "front-surface" technique. Details of the resulting method are provided. The final reaction mixture contains 4 mmol of the substrate per liter of tris(hydroxymethyl)aminomethane (100 mmo...

A new potassium electrode, made from valinomycin, which uses commercially available electrode configurations, responds to potassium ion concentrations from 1 mole per liter to below 10(-6) mole per liter. It is highly selective for potassium ion over sodium ion and divalent ions and can be used for the direct determination of potassium ion in human serumn. No significant complexing of potassiiu...

Several yeast strains belonging to genus Candida were found to selectively hydrogenate l-sorbose with enantiomeric specificity, yielding optically pure l-iditol in the culture broth. The most active strain, isolated from a commercial lemon, was identified as Candida intermedia, which produced 50 g of l-iditol per liter from 150 g of l-sorbose per liter during a 5-day fermentation period (35% yi...

We studied the optimal composition of EDTA-chelated biuret reagent for the determination of protein in serum. A reagent containing 18 mmol of EDTA, 15 mmol of Cu2, and 1 mol of NaOH per liter exhibits a very low blankbut about the same sensitivity as tartrate-chelated reagents. Maximum color intensity is attained within 25 mm at room temperature, and adheres to Beer’s law up to 120 g of protein...

The deposition of manganese in a water distribution system with manganese-related "dirty water" problems was studied over a 1-year period. Four monitoring laboratories with Robbins biofilm sampling devices fitted to the water mains were used to correlate the relationship among manganese deposition, the level of manganese in the water, and the chlorination conditions. Manganese deposition occurr...

The purpose of this work is to analyse the characteristics entrepreneurs and business profiles, production process use inputs, costs, output, sales price, income, efficiency added value in soy milk agroindustry. This study used a survey method Purwodadi Village, Tampan District, Pekanbaru City, Riau Province. Data were analysed using descriptively qualitatively quantitatively. results showed th...

In this research, to evaluate the effect of superabsorbent polymer and drought stress on the number and leaf area of Lettuce, experimental  research was conducted in a completely randomized design factorial with two treatments of irrigation regime at three levels (60, 80 and 100 percent of crop water requirement) and four superabsorbent hydrogel application (0, 4, 6 and 8 g per kg of soil) in t...