Application of selenium isotopes to define selenium bioreduction in coal waste rock: Elk Valley, British Columbia.

Anthropogenic sources of selenium (Se), including coal mining, can release Se to the environment and raise Se concentrations in receiving waters above drinking water and aquatic limits. Selenium bioreduction can be an important control to reduce dissolved selenate concentrations. This extensive study investigated the application of Se stable isotope ratios (δSe) of dissolved selenate to identify Se bioreduction in saturated and unsaturated mine rock piles (MRPs) located in the Elk Valley, Canada.

Selenate bioreduction in a large in situ field trial.

Removing selenium (Se) from mine effluent is a common challenge. A long-term, in situ experiment was conducted to bioremediate large volumes (up to 7500 m d) of Se(VI)-contaminated water (mean 87 μg L) by injecting the water into a saturated waste rock fill (SRF) at a coal mining operation in Elk Valley, British Columbia, Canada. To stimulate/maintain biofilm growth in the SRF, labile organic carbon (methanol) and nutrients were added to the water prior to its injection.

Quantifying denitrification in a field-scale bioremediation experiment.

Nitrate (NO-) in mine waste rock derived from undetonated NHNO can contaminate receiving waters. An in-situ bioremediation experiment was conducted at a coal mining operation in Elk Valley, British Columbia, Canada to remediate NO- from large volumes of mine water. Over the test period (201 d), 5000 to 7500 m d of NO--rich (mean concentration 22 mg N L) mine water was injected into saturated waste rock along with methanol, nutrients, and a conservative tracer (Br-).

Primary feather follicle ablation in common pintails (Anas acuta acuta) and a white-faced whistling duck (Dendrocygna viduata).

Eight 1-yr-old common pintails (Anas acuta acuta) and one 2-yr-old white-faced whistling duck (Dendrocygna viduata) were presented for the persistence of primary flight feathers 1 yr after pinioning. The birds were housed outdoors in an open enclosure necessitating flight prevention. The birds were placed under general anesthesia, and a diode laser was used to ablate the primary feather follicles of the previously pinioned wing.

Pharmacokinetics of voriconazole after oral administration of single and multiple doses in Hispaniolan Amazon parrots (Amazona ventralis).

Objective: To determine the pharmacokinetics and safety of voriconazole administered orally in single and multiple doses in Hispaniolan Amazon parrots (Amazona ventralis).

Animals: 15 clinically normal adult Hispaniolan Amazon parrots.

Procedures: Single doses of voriconazole (12 or 24 mg/kg) were administered orally to 15 and 12 birds, respectively; plasma voriconazole concentrations were determined at intervals via high-pressure liquid chromatography.

Avian transfusion medicine.

Anemia is defined as a decreased capacity of the blood to carry oxygen and is recognized by packed cell volume, erythrocyte, and hemoglobin values below reference ranges. Causes of anemia in birds include blood loss, heavy metal toxicosis, parasitic infection, and chronic disease. Several differences exist between avian and mammalian physiology, including the avian ability to tolerate greater losses of blood.

Besnoitia darlingi infection in a Virginia opossum (Didelphis virginiana).

This is a case report of natural infection with Besnoitia darlingi in a Virginia opossum (Didelphis virginiana) in Louisiana. Clinical pathologic data included a severe nonregenerative anemia, inflammatory leukogram, increased hepatocellular leakage enzymes, renal azotemia, hyperkalemia, hypoglycemia, hypoalbuminemia, and proteinuria. Tissue cysts containing bradyzoites were found in the majority of organs, especially the skin, mucous membranes, kidneys, adrenals, lungs, and heart.

Spinal lymphoma and pulmonary filariasis in a pet domestic rabbit (Oryctolagus cuniculus domesticus).

Spinal lymphoma and concurrent pulmonary filariasis are reported in a pet rabbit. The rabbit presented for pelvic limb paralysis resulting from extradural spinal lymphoma, presumably rising from the body of the sixth lumbar vertebra. The neoplasm was subsequently immunophenotyped as a B-cell lymphoma.