1 Introduction ZnSe is a kind of semiconductor materials with a broad band gap of direct transition, and is suitable for making photoelectric devices in the short-wavelength of visible light. It is also a kind of good...1 Introduction ZnSe is a kind of semiconductor materials with a broad band gap of direct transition, and is suitable for making photoelectric devices in the short-wavelength of visible light. It is also a kind of good infrared window materials. In recent years, investigations of diluted magnetic semiconductors （DMS） based on ZnSe, e. g. Zn<sub>1-x</sub>Fe<sub>x</sub>Se, Zn<sub>1-x</sub>Mn<sub>x</sub>Se, have been developed rapidly, because they possess the singular magnetic and optical properties. The theoretical and experimental studies show that the optical properties, such as optical absorption of DMS, are obviously influenced by展开更多
Human-induced growth of macro-algae is often assumed to increase trematode infections in fishes by increasing the abtmdanee and condition of the parasite＇s intermediate host - snails - as this can boost the release o...Human-induced growth of macro-algae is often assumed to increase trematode infections in fishes by increasing the abtmdanee and condition of the parasite＇s intermediate host - snails - as this can boost the release of trematode larvae, cercariae, from the intermediate hosts. However, macro-algae can also impose barriers to the transmission of cercariae and reduce infections. We investigated whether an increased growth of filamentous algae affects the transmission of Diplostomum pseudospathaceum cercariae to the threespine stickleback Gasterosteus aculeatus, a common fish in eutrophied shallow waters. We exposed stickle- backs to trematode cercariae in the absence and presence of artificial filamentous algae, and recorded effects on the proportion of sticklebacks infected and the number of encysted metacercariae per fish. No significant effect of artificial algae on cercariae transmission was detected. However, the body size and the sex of the sticklebacks were strongly correlated with the number of encysted metacercariae per infected fish, with females and larger individuals being more infected. We discuss different factors that could have caused the difference in parasite transmission, including sex-related differences in body size and behaviour of sticklebacks .展开更多
基金Project supported by the Doctoral Training Foundation of National Education Commission.
文摘1 Introduction ZnSe is a kind of semiconductor materials with a broad band gap of direct transition, and is suitable for making photoelectric devices in the short-wavelength of visible light. It is also a kind of good infrared window materials. In recent years, investigations of diluted magnetic semiconductors （DMS） based on ZnSe, e. g. Zn<sub>1-x</sub>Fe<sub>x</sub>Se, Zn<sub>1-x</sub>Mn<sub>x</sub>Se, have been developed rapidly, because they possess the singular magnetic and optical properties. The theoretical and experimental studies show that the optical properties, such as optical absorption of DMS, are obviously influenced by
文摘Human-induced growth of macro-algae is often assumed to increase trematode infections in fishes by increasing the abtmdanee and condition of the parasite＇s intermediate host - snails - as this can boost the release of trematode larvae, cercariae, from the intermediate hosts. However, macro-algae can also impose barriers to the transmission of cercariae and reduce infections. We investigated whether an increased growth of filamentous algae affects the transmission of Diplostomum pseudospathaceum cercariae to the threespine stickleback Gasterosteus aculeatus, a common fish in eutrophied shallow waters. We exposed stickle- backs to trematode cercariae in the absence and presence of artificial filamentous algae, and recorded effects on the proportion of sticklebacks infected and the number of encysted metacercariae per fish. No significant effect of artificial algae on cercariae transmission was detected. However, the body size and the sex of the sticklebacks were strongly correlated with the number of encysted metacercariae per infected fish, with females and larger individuals being more infected. We discuss different factors that could have caused the difference in parasite transmission, including sex-related differences in body size and behaviour of sticklebacks .
