Despite the important roles played by parasites in local population dynamics and community structure of marine ecosystems, there is a lack of information on the geographical variation in infection levels displayed by particular host–parasite species combinations. This study examines geographical variation in infection levels by the metacercarial stages of trematode parasites in crustacean and b...

form (Pieroni and Byrne, 1989, 1990). Materials and Methods Aplysiu culifornicu (125-300 gm) were obtained from Alacrity Marine Biological Specimens (Redondo Beach, CA), Marine Specimens Unlimited (Pacific Palisades. CA). and Marinus. Inc. (Lone. Beach. CA). AnI I I ~imals were maintained in individual perforated cages at 15”C’in aquaria filled with aerated artificial seawater (ASW; Instant Oce...

1. Serotonin (5-HT), small cardioactive peptide B (SCPB) and FMRFamide have well-established facilitatory and inhibitory effects on sensory neurons and their connections with motor neurons mediating withdrawal reflexes in Aplysia. Little is known, however, about their effects on interneurons contributing to those reflexes. As a first step, we examined the effects of these three transmitters on ...

There is little known about the nature of the metabolic products derived from cardiac glycosides in the animal body. Reports of the formation of digitoxigenin from the glycoside digitoxin in vivo have appeared in the literature (l-3), but reliable chemical methods of identification applicable to the very small quantities of material involved were not available to these workers. Fischer, Sjoerds...

The crustacean hyperglycemic hormone is the most abundant neuropeptide present in the eyestalk of Crustacea and its main role is to control the glucose level in the hemolymph. Our study was aimed at assessing the importance of C-terminal amidation for its biological activity. Two recombinant peptides were produced, Asl-rcHH-Gly with a free carboxyl terminus and Asl-rcHH-amide with an amidated C...

Due to the over-harvesting and deterioration of wild populations, the ever-growing crustacean market is increasingly reliant on aquaculture, driving the need for better management techniques. Since most cultured crustacean species exhibit sexually dimorphic growth patterns, the culture of monosex populations (either all-male or all-female) is a preferred approach for gaining higher yields, with...

abstract background antibiotic resistance makes antimicrobial peptides (amps) agents an alternative for treatment of pathogenic diseases. they are isolated from various animals invertebrates, vertebrates and plants. the present study shows the electrophoretic pattern of protein and peptides from vicia faba seed and reports our first attempt to study the antibacterial activity of vicia faba seed...

We report the first integrated proteomic and transcriptomic investigation of a crustacean venom. Remipede crustaceans are the venomous sister group of hexapods, and the venom glands of the remipede Xibalbanus tulumensis express a considerably more complex cocktail of proteins and peptides than previously thought. We identified 32 venom protein families, including 13 novel peptide families that ...