STUDIES ON THE OPOSSUM (<i>TRICHOSURUS VULPECULA</i>)

Anderson, Doris

doi:10.1038/icb.1937.2

Cited by 4 publications

(3 citation statements)

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“…The nature of this oxygen uptake is not known, but this author assumed that a chlorophyll was the light-absorbing pigment. During the early stage of greening when no electron could be obtained from water, the hypothesis of the presence of some endogenous reductants is also to be considered (Anderson and Boardman, 1964;Hiller and Boardman, 1971).…”

Section: Discussionmentioning

confidence: 99%

Appearance and Development of Photosynthetic Activities in Wheat Etioplasts Greened Under Continuous or Intermittent Light—evidence for Water‐side Photosystem Ii Deficiency After Greening Under Intermittent Light*

Rémy

1973

Photochem & Photobiology

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Etiolated wheat seedlings are greened under continuous or intermittent light. Under continuous light the onset of photosystem I1 (PS In activity appears after 4 h of illumination. Under intermittent light (1 ms flashes alternating with IS min dark periods), PS I1 activity cannot be detected after 300-400 flashes, although the pigment composition and structural development of these plastids are similar to those observed after 4 h of continuous light. However, the appearance of PS I1 activity in isolated plastids can be observed in two different ways: (1) in uiuo by exposing the seedlings to a short period of continuous light after the intermittent light; or (2) in uitro by addition to the isolated plastids of an electron donor for PS 11, such as diphenylcarbazide. It is concluded that the intermittent light induces development of the electron transport chain from PS I1 to PS I, but that a deficiency occurs on the water-side of PS 11.

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Section: Discussionmentioning

confidence: 99%

Appearance and Development of Photosynthetic Activities in Wheat Etioplasts Greened Under Continuous or Intermittent Light—evidence for Water‐side Photosystem Ii Deficiency After Greening Under Intermittent Light*

Rémy

1973

Photochem & Photobiology

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“…It has been noted in a previous paper (Anderson, 1937) that lactating opossums show an increase of reducing substances in the blood; the increased diastatic activity observed in lactation may be connected with the demand for the simpler reducing substances, formed by the breakdown of complex carbohydrates, for transference by the milk to the developing young.…”

Section: Jjrine and Plasma Diastase In Lactating Opossumsmentioning

confidence: 82%

DIASTASE IN THE OPOSSUM (Trichosurus Vulpecula)

Anderson

1938

Aust J Exp Biol Med

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“…However, because of the increase in nitrogen intake during this study it is poss¬ ible that there was no net nitrogen loss. In marked contrast with the response shown in most macropodid marsupials to glucocorticoids, an investigation by Anderson (1937) suggested that the metabolic effects of adrenocortical hormones in the brush-tailed possum might more closely resemble the eutherian response pattern. This was confirmed in the elegant studies of Than & McDonald (1974a,¿>) who showed that short-term infusions of cortisol caused a rapid increase in plasma glucose concentration without changes in plasma urea, amino acid or free fatty acid (FFA) concentrations, while ACTH infusion had a similar effect except that the FFA concentration now increased.…”

mentioning

confidence: 77%

Metabolic effects of cortisol, ACTH, adrenalin and insulin in the marsupial sugar glider, Petaurus breviceps

Bradley

Stoddart²

1990

Journal of Endocrinology

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The effects of cortisol, ACTH, adrenalin and insulin on indices of carbohydrate, fat and protein metabolism were investigated in the conscious marsupial sugar glider Petaurus breviceps. Short-term i.v. infusion of cortisol at dose rates of 0.02, 0.2 and 1.0 mg/kg per h caused the plasma glucose concentration to rise sharply from the normal range of 3.3-4.4 to 8.1-8.7 mmol/l at the end of the infusion period without significant alteration in plasma free fatty acid (FFA), amino acid or urea concentrations. Infusions of ACTH at dose rates of 0.02, 0.06 and 0.45 IU/kg per h caused a similar rise in plasma glucose concentration; however, this was now accompanied by an elevation in plasma FFA concentration, but again without significant changes in either plasma amino acid or urea concentrations. Infusion of adrenalin at 10 micrograms/kg per h caused an increase in the plasma concentrations of both glucose and FFA. Intravenous injections of 0.15 IU insulin/kg caused a rapid and marked decrease in the plasma glucose concentration within 30 min and an increase in the plasma free cortisol concentration. Associated with this change was a marked rise in the plasma concentration of both FFA and free cortisol. The rise in free cortisol was, however, significantly reduced by infusion of glucose. Pretreatment with five daily i.m. injections of 1 mg cortisol acetate/kg, which produced an increase in plasma free cortisol concentration to near the maximum of the physiological range, caused a marked reduction in insulin sensitivity. Cortisol pretreatment caused an increase in the plasma FFA and amino acid concentrations. Petaurus breviceps is highly sensitive to the metabolic effects of glucocorticoids and is similar in this respect to the brush-tailed possum Trichosurus vulpecula. The interactive effects between insulin and glucocorticoids on carbohydrate, fat and protein metabolism in Petaurus breviceps are similar to those shown by Trichosurus vulpecula and some eutherian mammals but contrast with the pattern described for two macropodid marsupials, the red kangaroo Macropus rufus and the quokka Setonix brachyurus.

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STUDIES ON THE OPOSSUM (TRICHOSURUS VULPECULA)

Cited by 4 publications

References 0 publications

Appearance and Development of Photosynthetic Activities in Wheat Etioplasts Greened Under Continuous or Intermittent Light—evidence for Water‐side Photosystem Ii Deficiency After Greening Under Intermittent Light*

Appearance and Development of Photosynthetic Activities in Wheat Etioplasts Greened Under Continuous or Intermittent Light—evidence for Water‐side Photosystem Ii Deficiency After Greening Under Intermittent Light*

DIASTASE IN THE OPOSSUM (Trichosurus Vulpecula)

Metabolic effects of cortisol, ACTH, adrenalin and insulin in the marsupial sugar glider, Petaurus breviceps

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