Three groups of animals were studied: group 1, six normal control dogs; group 2, six dogs that had ligation of the common bile duct; group 3, six dogs that had received orthotopic hepatic homografts. The dogs in the last group received postoperative immunosuppression with azathioprine 1-8 mg/kg/day. The radioisotope studies were carried out one-three times weekly, for one month in the animals o...

HALL, RODNEY C., AND ROBERT L. HODGE. Changes in catecholamine and angiotensin levels in the cat and dog during hemorrhage. Am. J. Physiol. 221(5) : 1305-1309. 197 1 .-The changes in the circulating levels of catecholamines and angiotensin were estimated simultaneously in cats and dogs during two different rates of hemorrhage to a constant volume by using an especially developed bioassay techni...

Digitalis is known to have a vasoconstrictor effect in the coronary circulation. Recent studies have demonstrated that the coronary vasoconstrictor effects of acetylstrophanthidin and digoxin are neurally mediated via alpha adrenergic fibers. In the present study, experiments were done in 20 dogs anesthetized with chloralose and urethane to study the central nervous system as a possible site of...

Blood Volume, Hematocrit and Pressure Relationships in the Isolated Perfused Dog Brain • The intracranial blood volume and hematocrit of the isolated perfused dog brain preparation were determined with Cr-labeIed erythrocytes. The intracranial blood volume was determined to be 8.6 ml/100 gm brain (SE±1.2 ml). Over the range of perfusing hematocrits studied, the relationship of perfusing hematoc...

were the carotid chemoreceptors also excluded from the circulation of the remainder of the body? Dr. Levine: In the head perfused animal preparation (Ic third preparation), both the carotid chemoreceptors and the brain were excluded from the circulation to the remainder of the body. the effect of acute cord transection on blood pressure? Dr. Levine: My dogs were anesthetized with chioralose (no...

Landscape-wide mass-flowering of oilseed rape (canola Brassica napus) can considerably affect wild bee communities and pollination success of wild plants. We aimed to assess the impact of oilseed rape on the pollination of wild plants and bee abundance during and after oilseed-rape bloom, including effects on crop-noncrop spillover at landscape and adjacent-field scales. We focused on two shrub...

BACKGROUND AND AIMS In the UK, the flowers of fruit-bearing hedgerow plants provide a succession of pollen and nectar for flower-visiting insects for much of the year. The fruits of hedgerow plants are a source of winter food for frugivorous birds on farmland. It is unclear whether recent declines in pollinator populations are likely to threaten fruit-set and hence food supply for birds. The pr...