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911.
The alates of the green peach aphid, Myzus persicae, were daily trapped from the air from late October through early January and carried to laboratory for determination of fungal
infection by individually rearing them for 7 d on detached cabbage leaves in Petri dishes. Among 760 alates trapped, 266 (35%)
were found carrying various fungal pathogens, 87.3% of them died due to mycosis during the first 3-day period of rearing and
the rest died in the following two days. Most of the deaths of the alates were attributed to entomophthoralean fungi, taking
94.4%, and the rest were the hyphomycetous fungus Beauveria bassiana. Among the Entomophthorales-killed alates, P. neoaphidis took a proportion of 66.1%, Z. anhuiensis 22.6%, E. planchoniana 9.7%, and N. fresenii 1.6%, respectively. Two alates were found suffering from cross infection of two fungal species, i.e. P. neoaphidis with Z. anhuiensis and N. fresenii, respectively. The results represent the first report on transmission of aphid-pathogenic fungi by M. persicae alates through migratory flight. 相似文献
912.
Qingyu Kong Yifeng Shen Jun Zhuang Li Zhao Shixiong Qian Yufen Li Xu Li Yanghui Lin Ruifang Cai 《科学通报(英文版)》2002,47(4):284-291
Photofragmentation study of metal fullerides C60M
x
(M = Sm, Pt, Ni and Rh) by excimer laser ablation-TOF mass spectrometry shows that metallofullerenes C2n
M and C2n+1M formed in both the positive and negative ionic modes. The isotopic distributions of the metallofullerenes C2n
M and C2n+1M are consistent with the calculated spectra based on the natural abundance of isotopes of C and M, confirming the formation
of metallofullerenes. The metal atom is supposed to be incorporated into the network of the fullerene cage to replace one
carbon atom of the cage forming substitutional metallofullerene. Odd-numbered high carbon clusters are observed in our laser
ablation study of all the metal fullerides in the negative ion channel. Evolution of mass spectrum with irradiation laser
shots shows that the formation of the substitutionally doped fullerenes is closely related to the production of metal carbide
(MC). The structures, as well as formation mechanism, of metallofullerenes C2n+1M and C2n
M with even and odd numbers of total atoms respectively are discussed based on the structural optimization of the odd-numbered
high carbon clusters. 相似文献
913.
Correlation of coral fluorescence with nearshore rainfall and runoff in Hainan Island, South China Sea 总被引:4,自引:0,他引:4
Under UV-laser excitation, the Porites coral from Longwan bay waters. Hainan Island, could emit yellow-green fluorescence. After fitting the data of the fluorescent intensity (FI) of the coral with the rainfall (RF) in nearshore area of Qionghai. a good relationship between FI and RF was found with a linear formula of RF = 889 — 4.54 FI and a correlation coefficient of 0.78. Based on this formula, the rainfall sequence from 1982 to 1997 has been reconstructed. The peak annual rainfall is usually related to global El nino events. By fitting the data of the fluorescent intensity and the runoff (RO). a quadric formula was obtained as RO = — 0.0279FI —18.59 FI - 950.9 with a correlation coefficient of 0.74. The reconstructed runoff sequence from 1982 to 1997 coincided with the rainfall occurrence. The results indicate that flood and drought incidents in coastal areas of the south China are affected by global change to a great extent. 相似文献
914.
The analysis of the flux observation dada from the Huaihe River Basin Experiment (HUBEX) shows that, in semi-humid monsoon regions, latent heat flux is as important as sensible heat flux in most situations. Moreover, it can even dominate the sensible heat flux in cropland and paddy field. This is distinct from that for arid and semi-arid regions where the sensible heat flux is dominant. Under clear sky conditions, the soil temperatures in different vertical layers all exhibit certain diurnal variations, and the magnitude decreases with depth to less than 1°C at a depth of 60 cm. This depth is considered as the transition layer for the soil moisture variation. On the other hand, the vertical profile of soil water content varies with the soil texture and even weather conditions, and the layer with maximum soil water content can also be found in Jiangji station during June 1998. 相似文献
915.
A mutant strain of E.coli showing strong green fluorescence is obtained during the study of cloning and expression of blue fluorescent protein gene bfp. A recombinant plasmid pHN122 has been isolated. It is demonstrated by enzyme digestion, subcloning and sequence analysis that it contains both of bfp and gfpK79R mutant genes. The results of spectrometric analysis show that GFPK79R expressed by pHN122 is the same as the wild type GFP, but its fluorescent intensity is increased 1.25~2.44-fold. 相似文献
917.
遥控小型机器人由于具有携带方便、适应性强、成本低廉等特点 ,正得到军事、公安、消防等领域的日益重视 ,为此设计了一种适用于履带运动机构的电动双流转向传动方案 ,经试验效果良好 . 相似文献
918.
使用连续发射的激光光源和半导体光电位置敏感器件,设计了一种三维非接触高精确度的光学测量系统,用于不规则三维物体参数的测量,并将这一测试系统应用前景作了展望. 相似文献
919.
The alates of the green peach aphid, Myzus persicae, were daily trapped from the air from late October through early January and carried to laboratory for determination of fungal infection by individually rearing them for 7 d on detached cabbage leaves in Petri dishes. Among 760 alates trapped, 266 (35%) were found carrying various fungal pathogens, 87.3% of them died due to mycosis during the first 3-day period of rearing and the rest died in the following two days. Most of the deaths of the alates were attributed to entomophthoralean fungi, taking 94.4%, and the rest were the hyphomycetous fungus Beauveria bassiana. Among the Entomophthorales-killed alates, P. neoaphidis took a proportion of 66.1%, Z. anhuiensis 22.6%, E. planchoniana 9.7%, and N. fresenii 1.6%, respectively. Two alates were found suffering from cross infection of two fungal species, i.e. P. neoaphidis with Z. anhuiensis and N. fresenii, respectively. The results represent the first report on transmission of aphid-pathogenic fungi by M. persicae alates through migratory flight. 相似文献
920.
探讨GCr1 5SiMn轴承钢 840℃油淬火后 ,分别在 2 60℃、 35 0℃、 45 0℃、 5 5 0℃回火 ,得到不同的原始组织 ,再进行激光淬火 .发现 2 60℃回火状态 ,表面组织为粗大的针状马氏体 ,硬度值低 ;而 35 0℃、 45 0℃、 5 5 0℃回火状态 ,表面组织为“隐晶马氏体” ,硬度值高 ,其中 35 0℃回火表面硬度值高达Hv =1 0 96,淬硬层深度可达 1mm . 相似文献