933 



Johnson, Alan A. (edj . 1970. 



Water pollution in the Greater New York area. Gordon & Breach, N.Y.,xix + 

 211 p. 



The 4 sessions covered Physical Aspects of New York Bight and Estuaries, 

 Chemical Aspects, Biological Aspects, and Engineering Aspects. No signifi- 

 cant mention of shellfishes is included. - J.L.M. 



934 



Johnson, Charles W. 1934. 



List of marine mollusca of the Atlantic coast from Labrador to Texas. 

 Proc. Boston Soc. Nat. Hist. 40(1): 1-204. 



The Boreal Province extends from northern Nova Scotia to Cape Cod, Mass. 

 (North of that is the Arctic Province, characterized by the southern 

 boundary of floating ice.) The Transatlantic Province extends from the 

 southern shore of Cape Cod to the vicinity of Cape Canaveral, Fla. It 

 can be subdivided further into the Virginian, from Cape Cod to Cape 

 Hatteras, and the Carolinian, Cape Hatteras to Florida. The Transatlantic 

 Province is characterized by the typical American genus Busy con, the region 

 in which the oyster can be successfully propagated and in which Venus 

 mereenaria abounds. Bathymetric distribution also is important and more 

 complicated. Phylum Mollusca, Class Pelecypoda, Order Teleodesmacea, 

 Family Veneridae, Genus Venus Linne 1758, Subgenus Mereenaria Schumacher 

 1817, Venus mereenaria mereenaria Linne 1758, Gulf of St. Lawrence to Fla. 

 and Gulf of Mexico. V. mereenaria notata Say 1822, Mass. to Fla; 

 V. mereenaria alba Dall 1902; V. mereenaria subradiata Palmer 1927 

 {radiata Dall, not Dillwyn) - these varieties are locally associated with 

 the typical form. V. campechiensis campechiensis Gmelin 1792 {V. mortoni 

 of authors), Virginia to Texas; V. campechiensis alboradiata Sowerby 1855, 

 Gulf of Mexico; V. campechiensis sub campechiensis Palmer 1927 (quadrata 

 Dall, not Deshayes) ; V. campechiensis texana Dall 1902, Texas. - J.L.M. 



935 



Johnson, Paul W.,and John McN. Sieburth. 1976. 



In situ morphology of nitrifying-like bacteria in aquaculture systems. 

 Appl. Envir. Microbiol. 31(3): 423-432. 



Slimes were scraped from surface of substrate, combined with culture waters 

 and enriched cultures, centrifuged, and pellets prepared for thin sectioning. 

 Sections were examined by transmission electron microscopy. Bacteria with 

 the morphology of species of Nitrosomonas and Nitrosococcus were observed in 

 preparations from marine culture systems for Mereenaria mereenaria. The 

 quahaug culture system had the greatest diversity of bacteria with 

 intracytoplasmic membranes. Three to 4 morphological types of bacterium 

 with different arrangements of cytomembrane were present. - J.L.M. 



936 



Johnson, W. H., and V. P. Thompson. 1970. 



The pH mediated aggregation of the large filaments of catch muscles. Biophys. 

 Soc, Progr. and Abstr. , 14th. Ann. Meeting: 84a (Abstract WPM-L9) . 



Large filaments isolated from white adductor muscle of Venus mereenaria showed 

 large visible aggregation when pH was lowered from 7.0 to 6.3. Crude muscle 

 homogenates were prepared at ionic strength 0.1 and large filaments isolated 

 in a centrifuge. Actin removal is assisted by centrifugation with "clearing 

 phase" conditions in presence of EGTA. Myosin can be removed from filaments 

 by lowering pH and increasing ionic strength. Phase contrast and electron 

 microscopy showed that ionic strength requirements for aggregation follow the 

 solubility curve for paramyosin, yet large longitudinally oriented aggregates 

 form with myosin present. No Ca ion dependence was found. Gluteraldehyde, as 

 typically used in muscle fixation, dispersed these aggregates. - J.L.M. 



260 



