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Full-Text Articles in Life Sciences
Temporal Changes In The Ommatidial Structure Of The Cockroach, Leucophaea Maderae, Becky Reitcheck
Temporal Changes In The Ommatidial Structure Of The Cockroach, Leucophaea Maderae, Becky Reitcheck
Masters Theses & Specialist Projects
A circadian rhythm in eye sensitivity to light has been previously reported for Leucophaea maderae. Temporal changes in eye cell morphology that could be correlated with those changes in eye sensitivity to light were examined. Rhabdom area, screening pigment organization and palisade layer area about the rhabdom were the parameters measured to detect structural change through time. Measurements of those parameters from tissue samples obtained from the anterior one-third of compound eyes surgically removed at midday, light offset, midnight and light onset from roaches entrained to a 12-h light / 12-h dark photoperiodic cycle were used to assess the …
The Short-Term Effects Of Manganese Toxicity On Ribulose 1,5 Biophosphate Carboxylase In Tobacco Chloroplasts, Kerrie Elliott
The Short-Term Effects Of Manganese Toxicity On Ribulose 1,5 Biophosphate Carboxylase In Tobacco Chloroplasts, Kerrie Elliott
Masters Theses & Specialist Projects
The short-term effects of manganese toxicity on ribulose 1,5 bisphosphate carboxylase (Rubisco) activity and concentration in tobacco chloroplasts were examined. The activity of the enzyme from both manganese-treated and control plants was determined 6, 12, 18, 24 , and 48 h after introduction of manganese (80 mg/Li. Enzyme activity was determined by monitoring rates of radioactive CO2 fixation into acid stable products. A slight stimulation of the enzyme's activity was noted in experimental plants after 18 h of exposure to manganese as compared with control plants. A decrease in the enzyme's activity in experimental plants was noted after 48 …