Climaterol reduces beta-adrenergic receptor density in rat skeletal muscles

Article Abstract:

The influence of the beta-adrenoreceptor agonist climaterol on the beta-adrenoreceptor density in the soleus, gastrocnemius and plantaris muscles of the rat was evaluated. Rats were fed with climaterol, and muscle samples were collected and analyzed. Results indicated that climaterol decreases the receptor density of the different skeletal muscles. This might be the reason for the short-term effect of climaterol on muscle hypertrophy, since the reduction in the number of receptors diminishes the adrenoreceptor agonist's effect on muscle growth.

Physiological aspects, Adrenergic beta agonists, Adrenergic beta-agonists, Beta adrenoceptors, Adrenergic beta receptors, Muscles, Hypertrophy of

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Explosive breeding reduces egg and tadpole cannibalism in wood frog, Rana sylvatica

Article Abstract:

Cannibalism is very prevalent among anurans and has been reported in at least 12 out of 21 families of frogs. It has been hypothesized to play a crucial role in favoring synchronized breeding. In a field experiment conducted at a normal breeding site, more than 50% of the eggs were cannibalized in less than 15 minutes after they were kept in the pond. The findings are in line with the view that synchronized breeding is an adaption reducing cannibalism in anurans breeding in temporary ponds.

Research, Analysis, Frogs, Anura, Cannibalism (Animals), Animal cannibalism

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Wood Cock

Article Abstract:

A personal narrative dealing with the attempted rescue of a dying bird is presented. The emotional trauma of watching an animal die in spite of one's best efforts is narrated.

Personal narratives, Animal rescue

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