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SUMMARY 1. Conventional **Ca efflux studies of Buccinum and Neptunia pharangeal retractor and columella muscles revealed the presence of a fast and a slow calcium compartment. KCl-induced depolarization caused a stimulation of the * B Ca efflux from the slow compartment, suggesting that this compartment may be related to calcium diffusion from intracellular(More)
There is growing evidence that ultraviolet (UV) wavelengths play an important role in avian mate choice. One of the first experiments to support this idea showed that female zebra finches (Taeniopygia guttata) prefer UV-reflecting males to males whose ultraviolet reflection has been removed. The effect was very strong despite little or no UV reflection from(More)
Fine structure of intestinal muscle in the gastropod Buccinum undatum is described. Myofibrillar organization is typical of non-pseudostriated molluscan muscles. The dense body system is poorly developed but there are extensive attachments plaques. The sarcolemma is elaborately modified. Deep infoldings of the membrane give the cells an irregular outline.(More)
Serine hydroxymethyltransferase (SHMT) is a key enzyme in the formation and regulation of the folate one-carbon pool. Recent studies on human subjects have shown the existence of two single nucleotide polymorphisms that may be associated with several disease states. One of these mutations results in Ser394 being converted to an Asn (S394N) and the other in(More)
The organization of the chitin-proteoglycan in Loligo vulgaris pen was examined ultrastructurally and related to the molecular order indicated by X-ray diffraction. There is a centrosymmetric striated repeat of 22 nm in the system which is based upon dark and light bands of unequal width. The banding is orientated perpendicular to the direction of the major(More)