penfluridol, a neuroleptic drug, considerably reversed halofantrine resistance in t9.96hf halofantrine resistant strain of plasmodium falicparum (originally chloroquine sensitive parasites), but not in k1hf halofantrine resistant strain (originally chloroquine resistant parasites)

Pilot programs in several states have shown that livestock guarding dogs are 70-80% effective in reducing predation on livestock by wildlife, primarily coyotes. In order to increase that percentage, ineffective dogs were studied and new techniques tested that had the potential of turning problems into successes. From the population of over 1,000 dogs that has been placed on farms and ranches na...

Males of many species adjust their reproductive behaviour according to the perceived risk of sperm competition. Although this phenomenon is widespread in insects and other animals, the mechanisms that allow mates to assess sperm competition levels remain largely unexplored. In this study, we analysed the mating behaviour of pairs of Tenebrio molitor beetles under three odour treatments represen...

Most species of Ancistrus exhibit a striking sexual dimorphism, mature males having an elaborate complex of enlarged fleshy tentacles on the snouts. Snout tentacles appear to be modifications of the fleshy cutaneous sheath that surrounds the base of an odontode (integumentary tooth) and are best developed in breeding males. The tentacles are thought to serve as accessory sensory structures beca...

The ability of some insects to engage in complex orchestrations of tracheal gas exchange has been well demonstrated, but its evolutionary origin remains obscure. According to a recently proposed hypothesis, insects may employ spiracular control of gas exchange to guard tissues against long-term oxidative damage by using the discontinuous gas-exchange cycle (DGC) to limit internal oxygen partial...

Understanding the costs and benefits of defending solitary females, or mate guarding, may be the key to understanding the evolution of monogamy in most mammals. Elephant-shrews, or sengis, are a unique clade of small mammals that are particularly attractive for studies of mate guarding. We studied the spatial organization of Eastern Rock Sengis (Elephantulus myurus) in KwaZulu-Natal, South Afri...