In previous work, senescence of ros

In previous work, senescence of rose petal cells has been shown to be
accompanied by a gradual decrease of membrane fluidity, as measured by
a fluorescence polarization technique. Concomitantly, an increase in the
free sterol-to-phospholipid ratio was found. Both observations were verified
in this study. Further, experiments carried out on whole tissue and isolated
protoplasts during senescence revealed that there was no quantitative
change in the level of free sterols. The content of phospholipids decreased
without any significant change in their composition. Results from experiments
measuring the incorporation of 132Plorthophosphate indicated a
reduced capacity for phospholipid synthesis in senescent cells. Both young
and old tissue showed phospholipase A and D activity, the former increasing
with age.
It was concluded that the fluidity of rose petal membranes decreases
with age as a result of a decrease in phospholipid content, brought about
by both reduced synthesis and enhanced degradation. Evidence supporting
the view that the phenomena observed are related specifically to changes
in the plasmalemma is discussed.

ผลลัพธ์ (อังกฤษ) 2:

In previous Work, Rose Petal senescence of cells has been shown to be
accompanied by a gradual decrease of membrane Fluidity, as measured by
a fluorescence polarization Technique. Concomitantly, an increase in the
free sterol-to-phospholipid ratio was Found. Verified observations were both
in this Study. Further, experiments carried out on whole tissue and isolated
protoplasts during senescence revealed that there was no quantitative
Change in the level of free sterols. The content of phospholipids Decreased
Without any significant Change in their composition. Results from experiments
measuring the Incorporation of 132Plorthophosphate indicated a
reduced capacity for phospholipid synthesis in senescent cells. Both Young
and Old tissue Showed phospholipase A and D Activity, the Former increasing
with Age.
It was concluded that the Fluidity of Rose Petal membranes decreases
with Age as a Result of a decrease in phospholipid content, brought About
by both reduced synthesis and Enhanced degradation. . Evidence supporting
the View that the observed phenomena are related specifically to Changes
in the plasmalemma is discussed.