. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 514 M. J. FAIN AND L. M. RIDDIFORD 100 UJ O i10 o UJ > < _j UJ. o GO Z o mm mo DAY OF INSTAR FIGURE 3. Juvenile hormone titer in Afanduca larvae after ecdysis to the fourth instar through the first third of the fifth instar. The JH concentration at each stage was calculated from the mean scores of initial dilutions of extracts. Each point is based on 3 to 5 extractions and about 25 assay larvae; bars indicate ± one standard deviation; filled arrow, mean time of PTTH release for Gate II larvae as determined by T
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 514 M. J. FAIN AND L. M. RIDDIFORD 100 UJ O i10 o UJ > < _j UJ. o GO Z o mm mo DAY OF INSTAR FIGURE 3. Juvenile hormone titer in Afanduca larvae after ecdysis to the fourth instar through the first third of the fifth instar. The JH concentration at each stage was calculated from the mean scores of initial dilutions of extracts. Each point is based on 3 to 5 extractions and about 25 assay larvae; bars indicate ± one standard deviation; filled arrow, mean time of PTTH release for Gate II larvae as determined by Truman (1972) ; open arrow, mean time of ecdysis of Gate II larvae to the fifth instar; cross-hatch represents darkness. Knowing the half-life, one can estimate the rate constant "a" in the expres- sion for the rate of decay, VD = dx/dt = —ax, where "; is the amount of JH and "t" the time. Integration of the rate expression, from x = x0 to x, and t = 0 to t, yields the expression, x = x0e~at, where "x0" is the initial amount of JH at t =- 0. Since x " x0/2 at t = T^ -- hours, then a = hours"1. Thus the rate expression is VD — —x () hours"1. Assuming that this rate constant is characteristic of intact fourth instar larvae during the latter part of day 2, one can. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
