Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

A microstructural investigation by electron microscopy on a travertine specimen collected from Munigou National Park, Sichuan Province, China revealed evidence of a non-classical reversed crystal growth route previously only discovered in synthetic materials. Examination of the travertine specimen suggests that the presence of organic matter initiates the oriented aggregation of calcite nanocry...

Naturally occurring ehrlichiosis in Egyptian dogs

Canine ehrlichiosis has emerged as one of the most clinically important tick-borne diseases affecting dogs. Eighty-five naturally infected dogs have been investigated, the most consistent clinical signs recorded were fever, emaciation and lymphoadenopathy, anemia, monocytosis, thrompocytopenia, hypoalbuminemia, elevation in liver enzymes and total bilirubin were the most remarkable changes asso...

Coinfection Associated with Naturally Occurring Cryptosporidiosis in Broilers

Calcite Crystal Growth Rate Inhibition by Polycarboxylic Acids.

Calcite crystal growth rates measured in the presence of several polycarboxyclic acids show that tetrahydrofurantetracarboxylic acid (THFTCA) and cyclopentanetetracarboxylic acid (CPTCA) are effective growth rate inhibitors at low solution concentrations (0.01 to 1 mg/L). In contrast, linear polycarbocylic acids (citric acid and tricarballylic acid) had no inhibiting effect on calcite growth ra...

A naturally occurring structural variant of human growth hormone.

A structural variant of human growth hormone was isolated from pituitary extracts. The newly recognized modification had a molecular weight of 20,000 when analyzed by electrophoresis in sodium dodecyl sulfate, whereas human growth hormone gave a value near 22,000. By isoelectric focusing the variant had a p1 of 5.85; human growth hormone had a value of 5.6. All extracts of 30 individual fresh f...