Different species of microbes form mixed-culture biofilms in cooling water systems. They cause microbiologically influenced corrosion (MIC) and biofouling, leading to increased operational and maintenance costs. In this work, two D-amino acid mixtures were found to enhance two non-oxidizing biocides [tetrakis hydroxymethyl phosphonium sulfate (THPS) and NALCO 7330 (isothiazoline derivatives)] a...

Sir: As described in the preceding communi-cation1), 3' , 4/-dideoxykanamycin B (DKB) was inactivated in the presence of ATP by an enzyme preparation obtained from Es-cherichia coli JR66/W677 carrying R factor. In this communication, the structure of the inactivated antibiotic is shown to be 3', 4'-dideoxykanamycin B-2/r-adenylate by nuclear magnetic resonance study. We reported that the inacti...

A total of 360 barrows (DNA 600 × 241; initially 12.1 ± 0.07 lb) were used in a 38-d growth study to evaluate the effects including folic acid (Rovimix Folic Acid, DSM, Parsippany, NJ) with or without pharmacological levels Zn provided by zinc oxide (ZnO) on performance and fecal characteristics nursery pigs. Pigs weaned at approximately 19 d age randomly allotted 1 6 dietary treatments. 72 pen...

A hand-saving HPLC method to measure urinary phenylmercapturic acid (PMA) was developed which allows about 35 PMA determinations per day. The method involves conversion of pre-PMA to PMA by the addition of sulfuric acid to a urine sample, extraction into an ether-methanol mixture followed by condensation under a nitrogen stream. The condensate was introduced to a ODS-3 column in a HPLC system, ...

Through a series of in vitro, greenhouse, field experiments with 4 iterations, control variants, statistical processing reliability we see: Toxicity in the environment alum soil has very volatile Large and complex, this variation depends: 1-Applying three tons CaCO3/ha to rice soil, otherwise washing acid sulfate some case sometimes it is harmful. 3-Acid water pH = 3.8 (A1<s...

Three experiments were conducted to evaluate the effect of feeding pharmacological concentrations of zinc (Zn), from organic and inorganic sources, on growth performance, plasma and tissue Zn accumulation, and Zn excretion of nursery pigs. Blood from all pigs was collected for plasma Zn determination on d 14 in Exp. 1, d 7 and 28 in Exp. 2, and d 15 in Exp. 3. In Exp. 1, 2, and 3, 90, 100, and ...

Structure of Oligostatin C Oligostatin C (Ic), a basic, water-soluble, amorphous substance; m.p. 183'C (dec.), [a]21+154' (c 1, H,O), shows strong IR absorption maxima at 31003600 and 9801180 cm-1 indicative of its oligosaccharide nature. PMR spectrum of Ic in D2O shows a methyl signal at 1.38 ppm (d, J=6 Hz), a methine proton at 2.76 ppm (t, J=9 Hz) and complex signals at 5.2 5.5 ppm assignabl...

In apurinic acid, a single-stranded polydeoxyribonucleotide easily obtained upon depurination of DNA, the proton resonances arising from thymine and cytosine are readily observable in aqueous solution of 25 degrees C. Two methyl thymine resonances, centered at 1.88 ppm and separated by 0.045 ppm, are observed. We attribute the downfield methyl resonance to thymines with no pyrimidine nearest ne...

The developmental toxicities of seven acrylates were studied in Sprague-Dawley rats after inhalation exposure for 6 h/day, during days 6 to 20 of gestation. The exposure concentrations were: for acrylic acid, 50, 100, 200, or 300 ppm; for methyl acrylate, 25, 50, or 100 ppm; for ethyl acrylate, 25, 50, 100, or 200 ppm; for butyl acrylate, 100, 200, or 300 ppm; for ethylhexyl acrylate, 50, 75, o...