. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 349 -9 1-7 IO i O x 8 - DC. < u -6 2 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP SEASONAL VARIATION IN THYROID EPITHELIUM, AND THYROID WEIGHT OF MALE COBRA, NAJA NAJA L. Vertical bars represent follicular height during the hibernation period from November to April, but a 30% increase in May as compared to April (P < ) suggests an increase in secretory activity. This increase was of short duration, being followed by a 35% decrease by July (P < ), the cell-height showing an absolute minimum of p
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 349 -9 1-7 IO i O x 8 - DC. < u -6 2 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP SEASONAL VARIATION IN THYROID EPITHELIUM, AND THYROID WEIGHT OF MALE COBRA, NAJA NAJA L. Vertical bars represent follicular height during the hibernation period from November to April, but a 30% increase in May as compared to April (P < ) suggests an increase in secretory activity. This increase was of short duration, being followed by a 35% decrease by July (P < ), the cell-height showing an absolute minimum of p. during August (compared with /j, in May). A steady increase in cell-height in subse- quent months giving a 30% increase (/'< for October as compared to August, suggests an increase in gland activity following the inactive period during the summer. The stage of the epidermal sloughing cycle of each animal used in the study is shown in Table II. As the cobra shows some variation in the degree of develop- ment of the alpha-layer at the time of shedding [rf. the lizard Anolis carolinensis (Maderson and Licht, 1967)], the staging is slightly different from that ascribed to Elaphc taeniura ( Maderson, 1965b). For this reason, Table II shows no "stage 6" conditions as described by Maderson (1965b), but includes a readily recog- nizable "post-slough" condition when the alpha-layer is still being completed (Maderson and Licht, 1967J ; this is designated as Stage O. The distribution of epidermal conditions denoting the latter part of the renewal phase (Maderson, 1967) prior to shedding is of particular importance. Stages 4 and 5 (Maderson, 1965b) are represented by 0%, 33% and 33% of the animals sampled during August, July and April (the months during which thyroid epithelial height is lowest) and by 0%, 0% and 17% of the animals sampled during May, February and June (the months during which the thyroid epithelial height is greatest).. Please note that t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
