The functional response of adult Nabis kinbergii （Hemiptera： Nabidae） to density of diamondback moth Plutella xylostella （Lepidoptera： Plutellidae） was investigated under laboratory conditions. Holling＇ s （195...The functional response of adult Nabis kinbergii （Hemiptera： Nabidae） to density of diamondback moth Plutella xylostella （Lepidoptera： Plutellidae） was investigated under laboratory conditions. Holling＇ s （1959） type Ⅱ model was found to be a good fit for the observed functional response of this predator. The numbers of P. xylostella consumed increased with temperature from 15℃ to 35℃. The maximum number of prey killed was observed at 35℃, with average of 10.3 and 8.3 forth instar larvae consumed by adult females and males of N. kinbergii, respectively. The predation of N. kinbergii on P. xylostella increased with successive immature stages. The number of prey consumed by predators decreased as the body size of prey increased. An average of 131 eggs or 95 larvae of P. xylostella were killed by a single of female adult in 24 hours at 24＂C. The pupae of P. xylostella were observed to be eaten by fifth instar nymphs and adults N. kinbergiiin numbers of less than an average of 0.7 pupae per predator in 24 hours at 24＂C. Predation preference by N. kinbergii was also investigated. The number of P. xylostella and Myzus persicae killed by female N. kinbergii was not significantly different, but males killed significantly more P. xylostella than M. persicae. Both eggs and larvae of P. xylosteUa were killed in significantly greater number than those of Pieris rapae in the same feeding arena.展开更多
Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus...Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus Hsiao.The results from experiments showed that the amount of prey consumed of these principal natural enemies increased when the density of prey rised,and decreased when the density of natural enemies increased. The predation function response fitted Holling’s predation response equationⅡ,and could be fit with the Disk展开更多
The luminescence of Nd3+-doped in NaBi(WO4)2 single crystal was investigated from 10 K to room temperature.The excitation source was a pulsed dye laser in resonance into the(4G5/2+2G(1)7/2) levels of Nd3+ ions.Several...The luminescence of Nd3+-doped in NaBi(WO4)2 single crystal was investigated from 10 K to room temperature.The excitation source was a pulsed dye laser in resonance into the(4G5/2+2G(1)7/2) levels of Nd3+ ions.Several blue emission bands in the up-conversion luminescence spectra corresponded to transitions from 2P1/2 to 4I9/2.Some violet bands corresponding to transitions of 4D3/2→(4I9/2,4I11/2,4I13/2) were also observed.For comparison,the luminescence spectra and decay curves excited by the pulsed 355 nm l...展开更多
Nd:NaBi(WO_4)_2 crystals (Nd:NBW) were grown by Czochralski method. The pulling rate is 0.3 mm·h (-1),and the rotational speed of Nd:NBW crystal is 2 r·min (-1). The components of this single crystal were de...Nd:NaBi(WO_4)_2 crystals (Nd:NBW) were grown by Czochralski method. The pulling rate is 0.3 mm·h (-1),and the rotational speed of Nd:NBW crystal is 2 r·min (-1). The components of this single crystal were determined by X-ray diffractions,and its corresponding properties were described from thermal gravity and differential thermal analysis experiments. The absorption cross-sections were calculated. The emission band of Nd:NBW crystal was obtained from its luminous spectrum.展开更多
文摘The functional response of adult Nabis kinbergii （Hemiptera： Nabidae） to density of diamondback moth Plutella xylostella （Lepidoptera： Plutellidae） was investigated under laboratory conditions. Holling＇ s （1959） type Ⅱ model was found to be a good fit for the observed functional response of this predator. The numbers of P. xylostella consumed increased with temperature from 15℃ to 35℃. The maximum number of prey killed was observed at 35℃, with average of 10.3 and 8.3 forth instar larvae consumed by adult females and males of N. kinbergii, respectively. The predation of N. kinbergii on P. xylostella increased with successive immature stages. The number of prey consumed by predators decreased as the body size of prey increased. An average of 131 eggs or 95 larvae of P. xylostella were killed by a single of female adult in 24 hours at 24＂C. The pupae of P. xylostella were observed to be eaten by fifth instar nymphs and adults N. kinbergiiin numbers of less than an average of 0.7 pupae per predator in 24 hours at 24＂C. Predation preference by N. kinbergii was also investigated. The number of P. xylostella and Myzus persicae killed by female N. kinbergii was not significantly different, but males killed significantly more P. xylostella than M. persicae. Both eggs and larvae of P. xylosteUa were killed in significantly greater number than those of Pieris rapae in the same feeding arena.
文摘Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus Hsiao.The results from experiments showed that the amount of prey consumed of these principal natural enemies increased when the density of prey rised,and decreased when the density of natural enemies increased. The predation function response fitted Holling’s predation response equationⅡ,and could be fit with the Disk
基金supported by the Korea Science and Engineering Foundation (KOSEF) Grant funded by the Korean Government (MEST) (2009-0078682)
文摘The luminescence of Nd3+-doped in NaBi(WO4)2 single crystal was investigated from 10 K to room temperature.The excitation source was a pulsed dye laser in resonance into the(4G5/2+2G(1)7/2) levels of Nd3+ ions.Several blue emission bands in the up-conversion luminescence spectra corresponded to transitions from 2P1/2 to 4I9/2.Some violet bands corresponding to transitions of 4D3/2→(4I9/2,4I11/2,4I13/2) were also observed.For comparison,the luminescence spectra and decay curves excited by the pulsed 355 nm l...
文摘Nd:NaBi(WO_4)_2 crystals (Nd:NBW) were grown by Czochralski method. The pulling rate is 0.3 mm·h (-1),and the rotational speed of Nd:NBW crystal is 2 r·min (-1). The components of this single crystal were determined by X-ray diffractions,and its corresponding properties were described from thermal gravity and differential thermal analysis experiments. The absorption cross-sections were calculated. The emission band of Nd:NBW crystal was obtained from its luminous spectrum.
