. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 142 J L ET AL o. .. Figure 3. PAP-staining of CHH-producing cells in the MTGX. il- lustrating +, ++, and + + + cells. Bar represents 50 nm. + cells: mean cell volume x 103 nm\ mean nuclear volume x 10' nm3; + + cells: mean cell volume x 103 nm}, mean nuclear volume X 103/im3; +++ cells: mean cell volume X 103/im3. mean nuclear volume x I03^m3. (Morphometrical data from Gorgels-Kallen and Voorter. 1984). supports the importance of the entraining function of the eyestalk: daily rhythmicity of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 142 J L ET AL o. .. Figure 3. PAP-staining of CHH-producing cells in the MTGX. il- lustrating +, ++, and + + + cells. Bar represents 50 nm. + cells: mean cell volume x 103 nm\ mean nuclear volume x 10' nm3; + + cells: mean cell volume x 103 nm}, mean nuclear volume X 103/im3; +++ cells: mean cell volume X 103/im3. mean nuclear volume x I03^m3. (Morphometrical data from Gorgels-Kallen and Voorter. 1984). supports the importance of the entraining function of the eyestalk: daily rhythmicity of the hemolymph glucose level is not affected after disturbance of the neural con- nection between the cerebral and optic ganglia. This re- sult points to the presence of a pacemaker or biological clock of the glucose rhythm located in the optic lobes, although hormonal modulation from a pacemaker lo- cated elsewhere cannot be ruled out. Indeed, such hor- monal influence is not disturbed by the optic tract opera- tion, since microscopic investigation of these eyestalks did not reveal any irregularities concerning blood circu- lation or the condition of eyestalk structures. However, the secretory activity of the CHH cells of these NO ani- mals does not show the same picture as found in control animals. Yet, as the blood glucose rhythmicity is compa- rable to control animals, it could be that CHH release is modulated by an oscillator located in the eyestalk. How- ever, that regulation of CHH synthesis is more complex and (also) affected by a pacemaker located elsewhere. Another possibility might be that the CHH cells not only produce a hyperglycemic factor but also other hormon- allv active substances. Synthesis of hyperglycemic hor- mone might be affected by optic nerve section, while the synthesis of other hormones might go on undisturbed. Such an effect can be visualized immunocytochemiculh. Our results exclude any regulatory effect caused by the caudal photorcceptor described
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
