this junction could regulate the efflux of ions from the "supersaturated" 

 solutions in the intercellular spaces onto the mantle surface. One can also 

 imagine how this "high calcium" solution on the lateral surfaces of the 

 cells might increase the influx of calcium into the cells and thus lead to 

 an anomalous accumulation of mitochondrial calcium during mineralization. 

 More data on potentials and diffusion mechanisms across such layers are 

 needed. - J.L.M. 



2213 



Sinclair, J. G.,and G. F. Lo. 1978. 



Acute tolerance to ethanol on in vivo release of acetylcholine. 

 Pharmaceut. Sci. 13(4): 100 (abstract). 



Cdn. 



ACh released from cortex of cat was assayed biologically using the heart of 

 the clam Mercenaria mercenaria. Ethanol produced a peak depression of ACh 

 release within 30 min but recovered to control levels in the following 30 

 min. Concentrations of ethanol in blood and in solution bathing the cortex 

 remained stable during this recovery period. Thus acute tolerance to ethanol 

 on the release of ACh does develop, and may be related to the acute tolerance 

 that develops to the behavioral effects of ethanol. - J.L.M. 



2214 



Sipos, J. C.,and R. G. Ackman. 1978. 



Automated and rapid quantitative analysis of lipids with chromarods. J. 

 Chromatographic Sci. 16(10): 443-447. 



Lipid extract of a live-held northern quahog {Venus meraenaria) showed the 

 following composition: 90% polar lipids, 3% sterol, 5% triglycerides, 2% 

 cholesteryl esters, and 1% hydrocarbons. - J.L.M. 



2215 



Smith, J. N. 1977. 



Comparative detoxication of invertebrates. In Drug Metabolism - from 

 Microbe to Man. D. V. Parke and R. L. Smith (eds.) . Taylor and Francis 

 Ltd., London: 219-232. 



Reduction of p-nitrobenzoic acid has been observed in the quahog Mercenaria 

 mercenaria (Carlson 1972). - J.L.M. 



2216 



Stafford, Walter F., Ill, and Andrew G. Szent-Gyorgyi. 1978. 



Physical characterization of myosin light chains. Biochem. 17(4): 607-614. 



Reports the results of an investigation into the size and shape of the low 

 molecular weight subunits (light chains) of myosin from several animal spe- 

 cies. Hydrodynamic, analytical gel filtration, and fluorescence anisotropy 

 decay measurements showed that these light chains could be represented by a 

 general ellipsoidal model having a longest axis of about 100±20 A. Inves- 

 tigation into the stability of the internal structure of the light chains 

 shows them to be very stable, and probably is characteristic of the light 

 chains when they are attached to myosin. - J.L.M. 



2217 



Steinberg, Marian N. 19 80. 



A preliminary system dynamics model of the effectiveness of shellfish 

 hatcheries on increasing harvestable yields. Proc. IEEE, 1980: 895-900. 



The paper presents the first in a series of systems dynamics models examining 

 the effect of fishing on the hard clam (Mercenaria mercenaria) resource which 

 is also eaten by a predator, and is reinforced by addition of artificially 

 reared clams. Clams are divided into five levels, from larvae to chowder 

 clams. Predators contain only one level, a generalized predator on juveniles. 

 In addition to the prey-predator relationship, heavy fishing pressure and 



615 



