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Identifying biological trends and threats to organisms that make long distance migrations are often the limiting factors in their conservation. Indeed, Laysan albatross Phoebastria immutabilis are highly vagile seabirds, foraging throughout the North Pacific Ocean. Despite mark–recapture data indicating natal philopatry, Laysan albatross recently re‐colonized several anthropogenically extirpated breeding...
The effects of environmental and nutritional factors on population dynamics and toxin production were examined in Alexandrium catenella, maintained in enriched K media in laboratory cultures. Starting with a density of 50 cell ml−1, the dinoflagellate population typically showed a lag phase and an exponential growth phase which lasted 14 days each, and then entered the stationary phase, with a maximal...
Dendrotoxins are 57-60 residue proteins isolated from venoms of mamba snakes, Dendroaspis angusticeps, D. polylepis and D. viridis. They are related to Kunitz-type inhibitors of serine proteases. Six natural variants have been sequenced: two isoforms of α-dendrotoxin and δ-dendrotoxin from D. angusticeps, toxin I and toxin K fromD. polylepis , and Dv 14 from D. viridis. Two related toxins, β- and...
The effects of the venom of the Sahara sand viper (Cerastes vipera) were studied on isolated chick biventer cervicis, isolated rat atria and vas deferens preparations, and on the electrocardiogram of anaesthetized rats. Effects on 3 H-noradrenaline uptake were studied using rat brain synaptosomes. At 50 μg/ml and 100 μg/ml, the venom caused a transient increase in rate and force of contractions...
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