Abstract
Hatching substance has been extracted from the barnacle,
Balanus balanoides,
and partly purified by thin layer chromatography. Several lines of evidence indicate that hatching substance is a prosta-glandin. First, the compound is extracted by a prostaglandin extraction procedure. Secondly, a fraction isolated from the dried cortex of the gorgonian coral,
Plexaura homomalla
, which stimulates barnacle eggs to hatch, co-migrates with hatching substance on thin layer chromatography plates. Acetylsalicylic acid (aspirin), which blocks the enzymic production of prostaglandins, prevents the formation of hatching substance. In contrast, indomethacin, which is a potent inhibitor of the mammalian cyclo-oxygenase, is without effect on the biosynthesis of hatching substance. Dopamine mimics the effect of hatching substance between the concentrations of 2.5 x 10
-3
M and 8.4 x 10
-5
M. Although dopamine is not the hatching substance
per se
, it is possible that this compound is implicated in the hatching process.
Reference58 articles.
1. The Hatching Process in Some Barnacles
2. Barnes H. 1957 Processes of restoration and synchronisation in marine ecology. The spring diatom increase and the `spawning'of the common barnacle Balanus balanoides (L.). biol. 33 67-85.
3. The formation of the egg mass in Balanus balanoides (L.);Barnes H.;Vanamo,1956
4. Note on Stimulation of Cirripede Nauplii
5. Barnes R. D. 1963 Invertebrate zoology 1st edn Philadelphia: W. B. Saunders Company.
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