Robert C. Terwilliger

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1. The concentration of myoglobin (Mb) and the isozymic distribution and activity of lactate dehydrogenase (LDH) in heart and pectoralis muscle were investigated at three stages of maturation of the Pigeon Guillemot, Cepphus columba. 2. Mb is not detectable in chick pectoralis; it is present in fledgling pectoralis muscle and increases four-fold in adult(More)
The arcid clam Barbatia reeveana contains an intracellular haemoglobin with an unusual structure. First, compared with other intracellular haemoglobins, it is extremely large, with a mol.wt. of 430000 and an s(20,w) of 13.6S. A minor component (mol.wt.=220000; s(20,w)=9.7S) is also present as a probable dissociation product of the major component. Secondly,(More)
The hemoglobin of the sea cucumber Cucumaria miniata Brandt has a mol. wt of about 36000 in the oxy- form with a s20,w equal to 2.9 and a subunit molecular weight of 18000 by sodium dodecylsulfate gel electrophoresis. This pigment aggregates when deoxygenated to an oligomer with a s20,w equal to 4.7, an aggregation which is reversible upon subsequent(More)
An oligomeric arginase with a molecular weight of 205000 is present in the intestinal tissues of the polychaete annelid Pista pacifica. The presence of an active subunit with a molecular weight of 34000 was demonstrated. The enzyme specificity, effect of thiol reagents on activity, kinetic properties of the intact enzyme and the active subunit were(More)
1. The hemocyanins of the protobranch bivalves Yoldia thraciaeformis, Yoldia limatula and Acila castrensis have absorption spectra similar to other hemocyanins. 2. Hemocyanins from all three bivalves appear as six-tiered cylinders in the electron microscope (30-32 nm in diameter by 34-38 nm in height). Yoldia thraciaeformis and A. castrensis hemocyanins(More)
A heterodont bivalve mollusk Calyptogena magnifica, from the East Pacific Rise and the Galápagos Rift hydrothermal vent areas, contains abundant hemoglobin in circulating erythrocytes. No other known heterodont clam contains a circulating intracellular hemoglobin. The hemoglobin is tetrameric and has a relatively high oxygen affinity, which varies only(More)
Hemocyanin from the Dungeness crab, Cancer magister, has been described as a 25-S two-hexamer assembly of two different 5-S subunits. We have found that at least six different 5-S polypeptide chains constitute this hemocyanin. They can be separated from one another by sodium dodecyl sulfate slab gel electrophoresis as well as by regular gel electrophoresis.(More)