the effects of prolonged administration of methylthiouracil were studied on several physiological parameters pertinent to the thyroid function in dog. though the individual variations of the measured parameters were not consistent but the statistical differences of diminution of basal metabolism rate, respiration rate and erythrocyte count- were significant brief explanations for the mechanism ...

Fluoride by modifying the activity of mitochondrial enzymes may change their respiration rate. In this study NaF at concentrations 5, 10, and 50 μM had no effect on the State 3 respiration rate of rat cardiac mitochondria with succinate substrate. At a higher concentration of 7.5 mM, a significant (p<0.001) decrease by as much as 120.4 ± 5.7 nmol [O]/min/mg protein occurred in the State 3 respi...

Respiration has a profound influence on crop yield because dry matter accumulation by a crop is closely related to assimilation of CO and respiratory activity. This paper describes the development of a 2 simulation model for respiration in wheat. While the growth respiration can be assumed to be proportional to the assimilation of CO , the model concentrated on the effects of biotic and environ...

We describe a model predicting the effects of low environmental oxygen on vital rates (egg production, somatic growth, and mortality) of the coastal planktonic copepod Acartia tonsa. Hypoxic conditions can result in respiration rate being directly limited by oxygen availability. We hypothesized that A. tonsa egg production, somatic growth, and ingestion rates would all respond in a similar mann...

BACKGROUND AND AIMS Respiration of autotrophs is an important component of their carbon balance as well as the global carbon dioxide budget. How autotrophic respiration may respond to increasing carbon dioxide concentrations, [CO(2)], in the atmosphere remains uncertain. The existence of short-term responses of respiration rates of plant leaves to [CO(2)] is controversial. Short-term responses ...

The rate at which CO2 is released from woody debris post-clearcut affects the long term carbon consequences of such disturbances. Changes in microclimate post-clearcut may alter the rate of woody debris decomposition from that in a mature forest. However, very few studies have explored post-disturbance rates of woody debris respiration and the possible influence of an altered microclimate, and ...

Addition of fatty acids to isolated hepatocytes raised respiration rate by 92% and raised mitochondrial membrane potential (delta psi m) in situ from 155 to 162 mV suggesting that the increased fuel supply had a greater effect on respiration rate than any increases in processes that consumed mitochondrial protonmotive force (delta p). The relationship between delta psi m and respiration rate wa...

The process of endogenous respiration of two strains of bakers' yeast, Saccharomyces cerevisiae, was examined kinetically. The rate of respiration with respect to time in a non-nutrient medium was found to exhibit two phases: (a) a period of constant rate of O(2) consumption and CO(2) production (R.Q. = 1) characteristic of cells with ample concentrations of stored material; (b) a first order d...