contains a single cysteine residue located near the first domain and, when 

 spin-labelled, the intensity of the nitroxide signal is reduced by 25% on 

 binding one mole of Mn ++ . Rabbit skeletal regulatory light chain contains 

 two cysteine residues located in the third and fourth domains and no (<5%) 

 interaction is observed when Hn ++ binds to spin-labelled derivatives. 

 Qualitatively, these results suggest that domain 1 is the most likely can- 

 didate for the Mn ++ binding site. A more quantitative evaluation using 

 the Leigh theory for the dipolar coupling between rigid-lattice electron 

 spins and various models for the regulatory light chain tertiary structure, 

 including that predicted by Kretsinger and Barry for the possibly isologous 

 troponin C structure, substantiates this conclusion. - authors' abstract. 

 - J.L.M. 



2088 



Burrier, Dale. 1975. 



The depth of burial in different sediment types of the hard shell clam 

 Mercenaria mercenaria in the Babylon area of Great South Bay. Research 

 paper completed at State University of New York, Potsdam (unpublished) . 



Depth of burial is in part related to the nature of bottom sediments. M. 

 mercenaria burrows deeper in poorly sorted, very fine-grained sands with a 

 high silt and clay fraction (mud) than in well-sorted fine-grained sands 

 with little or no silt and clay (sand) . Depth of burial is a function of 

 compactness of sediment. In mud, clams were found as deep as 21 cm; in 

 sand, only to 9 cm. Larger clams do not burrow as deeply as smaller. 

 Turbidity and salinity apparently have little influence. - J.L.M. 



2089 



Butera, Jay. 1980. 



The great quahog war: Narragansett Bay wardens step up attack on polluted- 

 clam trafficking. Natl. Fisherman 61(6): 43-45. 



Although many parts of Narragansett Bay are closed to hard clamming (Mer- 

 cenaria mercenaria) some quahoggers do not obey. There is money in illegal 

 clamming and the clammers point out that people are not getting sick from 

 eating the illegal clams. They operate mostly at night, with high powered 

 vessels, and employ various devices to avoid being caught. By degrees, the 

 enforcement people are gaining on them, however, and are beginning to con- 

 fiscate boats, and recently succeeded in having one man sent to prison as 

 well. But a gambling man with a good boat can take in as much as $500 for 

 an hour of good digging, while an honest man in legal waters may work all 

 day to make $30 to $300. Enforcement agents are afraid of typhoid, dys- 

 entery and infectious hepatiti-s, but there has not been a reported case 

 since 1963. The R.I. Shellf ishermen ' s Association has been trying to roll 

 back restrictions, but the problem varies with the weather, and a safety 

 factor must be built into the regulations. One method of handling the 

 problem is to transplant quahogs from closed to open areas for depuration, 

 but this is inefficient and not always 100% effective. Another way is to 

 build a depuration plant, but this is opposed by many fishermen who believe 

 that this also would create other problems. Meanwhile, some people con- 

 tinue to make fortunes, even though the war has been going on since the 

 1950s. - J.L.M. 



2090 



Carmichael, N. G. , K. S. Squibb, D. W. Engel, and B. A. Fowler. 1980. 



Metals in the molluscan kidney: uptake and subcellular distribution of 

 109 Cd, 5l *Mn and 65 Zn by the clam, Mevoenaria mercenaria. Comp. Biochem. 

 Physiol. 65A(2): 203-206. 



The kidney plays a major role in bioaccumulation of trace metals in M. 

 mercenaria. Cadmium was concentrated to the greatest extent by the kidney, 

 while manganese and zinc, essential trace elements, were more evenly dis- 

 tributed among other organs. Zinc was also concentrated in the kidney, 

 although to a much lesser degree and at a level not markedly different 

 from gill tissue. Subcellular fractionation of the kidney showed that 



580 



