酸度对胡敏酸与镉和锌离子络合反应的影响

用离子交换平衡法研究了不同pH下胡敏酸与锌、镉单独及复合存在下形成络合物的稳定性及配位数.结果表明:在Zn2+,Cd2+单独存在时,络合反应的稳定常数及配位数随着pH值的增大而增大;相同pH条件下,Zn2+和胡敏酸络合物的稳定常数及配位数大于Cd2+.在Zn2+,Cd2+复合存在时,pH的变化与胡敏酸络合金属离子的稳定常数及配位数没有明显依存关系;与单独存在时相比,在pH 3.5和pH7.0时,Zn2+,Cd2+和胡敏酸络合物的稳定常数和配位数都减小;而在pH 5.0时,Cd2+和胡敏酸络合物的稳定常数和配位数都增大,Zn2+和胡敏酸络合物的稳定常数和配位数都减小.     

Photodynamic action of erythrosin B as a toxic mechanism for infective larvae of bovine gastrointestinal nematodes

The effect of erythrosin B on adults and 3rd stage larvae of gastrointestinal nematodes of cattle was studied by treating calves per os with 20 mg kg-1, 40 mg kg-1, and 60 mg kg-1 of the dye daily for 21 days and monitoring its effect. Erythrosin B had no detectable effect on adult nematode fecundity or viability. Data collected did indicate, however, that erythrosin B produced a consistent toxic effect on 3rd stage larvae after exposure to fluorescent light. This toxic effect was dependent upon dosage of erythrosin B administered, time of light exposure and, to a much lesser extent, the length of time the larvae were left in culture in the presence of the dye.     

The fate of dinobuton and dinoseb on growing apples

After topical application of dinobuton or dinoseb to apple fruits approximately 75% and 72% respectively of the applied material was lost after 28 days. From apples treated with dinobuton the unchanged compound was the major component present up until 8 days but at later times the amounts of polar transformation products and water-soluble compounds predominated. Only small amounts of dinoseb were found at all times. A similar pattern of results was obtained from apples treated with dinoseb. The maximum amounts of material absorbed through the fruit skin were 3% from dinobuton-treated apples and 7% from dinoseb-treated applies.     

Dactylomegaly, a type of club foot (talipes) in a herd of Shorthorn cattle

Enlarged dew claws associated with syndactyly and/or deviation of the adjacent major digit are reported from 9 heifers in a herd of 800. The anomaly created a club-footed appearance.     

Collection of bronchoalveolar lavage fluid in cats, using an endotracheal tube

Bronchoalveolar lavage fluid was collected from 12 anesthetized cats by use of an endotracheal tube and syringe adapter. The safety of the technique was evaluated by monitoring mucous membrane color, capillary refill time, pulse rate, respiratory rate, ECG, and arterial blood gas tensions and by necropsy findings. Group A consisted of 3 cats that were administered (by lavage) 4 aliquots of 20 ml of saline solution during anesthesia for placement of femoral artery catheters. Group B consisted of 4 cats that were administered a smaller total volume of saline solution (3 aliquots of 5 ml/kg of body weight) during a separate anesthetic period, other than the one for placement of catheters. Group C consisted of 5 cats administered 3 aliquots (5 ml/kg) of saline solution during a separate anesthetic period and administered supplemental oxygen for 5 to 10 minutes before and for 20 minutes after the lavage procedure. Group-A cats had a prolonged recovery period that was attributed to the lengthy anesthetic period required for placement of femoral catheters. The effect was eliminated in the cats of the other groups in which the lavage procedure itself accounted for only 5 to 10 minutes of anesthetic time. Evaluation of mucous membrane color, capillary refill time, ECG, pulse, and respiratory rate revealed no persistent abnormalities. Transient increase in pulse and respiratory rate was seen in some cats. Blood gas analysis revealed noticeable decrease in arterial oxygen pressures (Pao2) after the lavage procedure. In group-C cats, oxygen supplementation allowed the maintenance of normal or above normal Pao2.(ABSTRACT TRUNCATED AT 250 WORDS)     

Digestion of bentiromide and absorption of xylose in healthy cats and absorption of xylose in cats with infiltrative intestinal disease

The digestion of bentiromide and the absorption of D-xylose was measured in 17 clinically healthy cats. The plasma xylose concentrations of the healthy cats were compared with values from 9 cats with diffuse infiltrative intestinal disease. The cats were administered 16.7 mg of bentiromide/kg and 0.5 g of xylose/kg via a stomach tube. Plasma samples were obtained before administration and 30, 60, 90, and 120 minutes after administration. The maximum mean plasma p-aminobenzoic acid concentration occurred at 60 minutes, with a value of 386 +/- 134 micrograms/dl (mean +/- SD). The maximum mean plasma xylose concentration also occurred at 60 minutes, with a value of 26.0 +/- 9.2 mg/dl. Plasma concentrations of p-aminobenzoic acid and xylose were lower in healthy cats than those reported for healthy dogs. There was no significant difference between xylose concentrations in healthy cats and cats with infiltrative intestinal disease.     

Short colon in two cats and a dog

Two cats and 1 dog were referred for evaluation of signs of large-intestinal dysfunction. In each instance, contrast radiography revealed an abnormally short, straight colon, with the cecum located in the left hemi-abdomen. Short colon did not appear to contribute specifically to the active disease processes found. The anomaly may develop owing to errors in the processes of elongation and rotation of the embryo's midgut. The clinical relevance of short colon is unknown, but the disorder may contribute to a history of chronic elimination of soft feces.     

Acute thallium toxicosis in a dog.

A Doberman Pinscher was evaluated for acute onset of gastroenteritis, characterized by anorexia, hematemesis, and hematochezia. The dog had ingested mole bait containing thallium 2 days prior to admission. Thallium toxicosis was confirmed by detection of thallium in the urine, using colorimetric analysis. The dog responded well to administration of antibiotics, fluids administered IV, warm-water enemas, and oral administration of activated charcoal slurries.