Energetic electrons in the magnetosphere of jupiter

Observations of energetic electrons ( greater, similar 0.07 million electron volts) show that the outer magnetosphere of Jupiter consists of a thin disklike, quasitrapping region extending from about 20 to 100 planetary radii (R(J)). This magnetodisk is confined to the vicinity of the magnetic equatorial plane and appears to be an approximate figure of revolution about the magnetic axis of the planet. Hard trapping is observed within a radial distance of about 20 R(J). The omnidirectional intensity J(0) of electrons with energy greater, similar 21 million electron volts within the region 3 r 20 R(J) is given by the following provisional expression in terms of radial distance r and magnetic latitude theta: J(0) = 2.1 x 10(8) exp[-(r/a) - (theta/b)(2)]. In this expression J(0) is particles per square centimeter per second; a = 1.52 R(J) for 3 相似文献   

Observations on demodectic mange in dogs

Abstract— A brief review of the literature on various aspects of demodicosis in dogs is followed by a suggested pathogenesis. Some of the effects of Demodex on hosts other than dogs are then mentioned. Reasons why Demodex canis is easily destroyed in vitro but not in vivo are put forward. Finally it is proposed that demodicosis is capable of eradication in pedigree dogs.     

Hyperpigmentation of the skin in canine demodicosis

The occasional development of hyperpigmentation of the skin of dogs with demodectic mange is reported. Of 50 randomly selected dogs treated for this disease at a Dublin clinic, five showed diffuse hyperpigmentation of the skin. The hyperpigmentation appeared to be the result of increased melanocyte activity in the epidermis. The dermis about infested hair follicles contained many histiocytes packed with melanin granules. Comparable reactions have been reported in man and hamsters with demodicosis. Adrenal cortical malfunction may be responsible for the observed increased melanocyte activity in these dogs.