Abstract
A method is described for preparation of CO2-free sea water of H-ion concentrations from pH 4.5 to 10.2.The eggs of Asterias, Arbacia and Chœtopterus retain for the longest time their capacity to fertilize and to divide at about pH 6.0.Approximately this same H-ion concentration is required to completely repress the maturation process in Asterias eggs.Chœtopterus eggs are activated by exposures of 30 minutes or more to solutions of pH 5.0 to 6.6. If left in these solutions they show marked ameboid movements and fragmentation, but do not divide. If returned to sea water half or more of the eggs will undergo one or two abortive divisions. The activating effect of the acid sea water is most intense at about pH 5.8 to 6.0.An exposure of 5 or 10 minutes to solutions of pH 5.0 to 6.6 (which is insufficient to activate) creates a block to fertilization which is permanent if the eggs are returned to sea water. If left from 30 minutes to several hours in the acid sea water, these eggs gradually recover their ferti...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
