The effects of calcium, cupric, ferrous and ferric ions on the formation of trihalomethanes (THMs) and haloacetic acids (HAAs) were investigated using natural organic matter (NOM), small molecular weight NOM surrogates and natural water samples. The results showed that the effects were greatly dependent on the disinfection byproduct (DBP) precursor structure and molecular weight, and metal ions...

For three years, about 1,500 hives were surveyed for varroa mites following feeding tests using cupric gluconate and cupric lactate in sucrose syrup. Three to five litres per hive of 0 to 2.8g of copper metal per litre of sucrose syrup were given in spring and/or summer. Bee and mite mortalities were recorded up to four years without significant toxicity being noted for honeybees. By contrast, ...

Phase-pure cuprous oxide (Cu2O) crystals are difficult to grow since cupric oxide can form within the crystal as the crystal is cooled to ambient conditions. Vacancies are the solute which causes precipitation of macroscopic defects. Therefore, even when a mostly phase-pure single crystal is used as a feed rod, cupric oxide inclusions persist in the recrystallized solid. Control of the thermal ...

Carboxamidomethyl derivatives of sperm whale metmyoglobin were prepared by reaction at pH 6.8 with iodoacetamide. The modified protein is similar to previously studied carboxymethyl preparations and shows many of the properties of the native, unmodified protein. Preparations were obtained with compositions in the following ranges, expressed as moles of histidine derivative per mole of protein: ...

The binding of cupric or zinc ion by sperm whale metmyoglobin appears to involve imidazole groups of histidyl residues (4, 5) that occur well removed from the NH2 terminus (6). The binding of each cupric ion by metmyoglobin is accompanied on the average by the displacement of one or more protons beyond that that may be borne by the imidazole group, presumably from peptide amide nitrogen atoms (...

Three different orientations of non-blue, type 2 cupric complexes on DNA fibers are obtained from EPR data. The cupric complex of bleomycin, CuBlm, binds as described previously (Shields, H., McGlumphy,C., and Hamrick, P., J., Jr. (1982) Biochim. Biophys. Acta 697, 113-120), except possibly with more restricted motion. The square plane of CuBlm makes an angle of about 65 degrees with the fiber ...

In the course of a comparative study of several methods for the determination of sugar in blood, the results of which will be recorded elsewhere, it became desirable to investigate the reaction betsveen copper sulfate and potassium iodide which is concerned in a number of methods for sugar determination (Bang (l), Maclean (2), Scales (3), Lehmann (4), Riegler (4), Peters (4), Kendall (5)). In c...

conclusions this easily fabricated electrode together with the fast and sensitive sw voltammetry was successfully applied for the determination of concentration of atz at trace levels, in different water samples. results the results revealed that decrease in peak current was proportional to atz concentration over the range of 5-75 ng/ml. the limit of detection (lod) and limit of quantification ...

Acidified cupric acetate soaks were tested for eradication of Xanthomonas campestris from naturally infected crucifer seeds. The pathogen was eradicated from seeds by soaking in 0.5% cupric acetate dissolved in 0.005 N acetic acid for 20 min at 35, 40, 45, and 50 degrees C but not 25 degrees C. Moreover, normal bacterial flora of crucifer seeds and the seed-borne Phoma lingam and Alternaria spp...

In the course of a comparative study of several methods for the determination of sugar in blood, the results of which will be recorded elsewhere, it became desirable to investigate the reaction betsveen copper sulfate and potassium iodide which is concerned in a number of methods for sugar determination (Bang (l), Maclean (2), Scales (3), Lehmann (4), Riegler (4), Peters (4), Kendall (5)). In c...