By means of the Capon spectral analysis technique calculated the frequency response of the geomagnetic transfer functions for the Chinese Great Wall Station on Antarctic, and made a preliminary inference for the und...By means of the Capon spectral analysis technique calculated the frequency response of the geomagnetic transfer functions for the Chinese Great Wall Station on Antarctic, and made a preliminary inference for the underground electrical conductivity structure. In the present note, the writer considers that there are some problems concerned in their paper. Maybe it is worthwhile discussing these problems as below.展开更多
This paper reports the analysis results (including pH,conductivity and ion concentrations) of the precipitation samples collected at the Chinese Great Wall Station,Antarctica (62°13′S, 58°58′W,ASL10.0 m) i...This paper reports the analysis results (including pH,conductivity and ion concentrations) of the precipitation samples collected at the Chinese Great Wall Station,Antarctica (62°13′S, 58°58′W,ASL10.0 m) in 1998.The average pH value and conductivity were 5.62 and 85.16 μS/cm,respectively.The pH value and conductivity of precipitation were higher during autumn, but lower during other seasons.The major ions in the precipitation were C1- and Na+,followed by SO_4^(2-),Mg^(2+),Ca^(2+),K^+,NO_3^-,NH_4^+ with the lower concentrations in order.The positive correlation significantly existing between the major ions,except NO_3^- and NH_4^+,indicated that those major ions might come from same sources.The fact that the relative abundances of ions in precipitation were very close to that of seawater of Antarctic Ocean indicated that marine aerosol was the dominant source of the ions of precipitation.However,there were yet other sources which may contribute to Ca^(2+) ion in the precipitation.The precipitation at the area was characterized by marine type chemically.展开更多
PECTATE LYASE‐LIKE10（PLL10） was previously identified as one of the differentially expressed genes both in microspores during the late pollen developmental stages and in pistils during the fertilization process in ...PECTATE LYASE‐LIKE10（PLL10） was previously identified as one of the differentially expressed genes both in microspores during the late pollen developmental stages and in pistils during the fertilization process in Chinese cabbage（Brassica campestris ssp. chinensis）. Here, antisense‐RNA was used to study the functions of BcPLL10 in Chinese cabbage. Abnormal pollen was identified in the transgenic lines（bcpll10‐4, ‐5, and ‐6）. In fertilization experiments, fewer seeds were harvested when the antisense‐RNA lines were used as pollen donor. In vivo and in vitro pollen germination assays less germinated pollen tubes were observed in bcpll10 lines. Scanning electron microscopy observation verified that the tryphine materials were over accumulated around the pollen surface and sticked them together in bcpll10.Moreover, transmission electron microscopy observation revealed that the internal endintine was overdeveloped and predominantly occupied the intine, and disturbed thenormal proportional distribution of the two layers in the non‐germinal furrow region; and no obvious demarcation existed between them in the germinal furrow region in the bcpll10 pollen. Collectively, this study presented a novel PLL gene that played an important role during the pollen wall development in B. campestris, which may also possess potential importance for male sterility usage in agriculture.展开更多
文摘By means of the Capon spectral analysis technique calculated the frequency response of the geomagnetic transfer functions for the Chinese Great Wall Station on Antarctic, and made a preliminary inference for the underground electrical conductivity structure. In the present note, the writer considers that there are some problems concerned in their paper. Maybe it is worthwhile discussing these problems as below.
基金Sponsored by the Youth Meteorological Science Fund in the Ninth Five-Year Plan from China Meteorological Administration
文摘This paper reports the analysis results (including pH,conductivity and ion concentrations) of the precipitation samples collected at the Chinese Great Wall Station,Antarctica (62°13′S, 58°58′W,ASL10.0 m) in 1998.The average pH value and conductivity were 5.62 and 85.16 μS/cm,respectively.The pH value and conductivity of precipitation were higher during autumn, but lower during other seasons.The major ions in the precipitation were C1- and Na+,followed by SO_4^(2-),Mg^(2+),Ca^(2+),K^+,NO_3^-,NH_4^+ with the lower concentrations in order.The positive correlation significantly existing between the major ions,except NO_3^- and NH_4^+,indicated that those major ions might come from same sources.The fact that the relative abundances of ions in precipitation were very close to that of seawater of Antarctic Ocean indicated that marine aerosol was the dominant source of the ions of precipitation.However,there were yet other sources which may contribute to Ca^(2+) ion in the precipitation.The precipitation at the area was characterized by marine type chemically.
基金supported by the National Program on Key Basic Research Projects (No.2012CB113900)Natural Science Foundation of China (No.31071805,31301790)+2 种基金Key Sci-Technology Project of Zhejiang Province (No.2010C12004)Guangdong Natural Science Foundation (S2013040016220)the China Postdoctoral Science Foundation (2013M530375)
文摘PECTATE LYASE‐LIKE10（PLL10） was previously identified as one of the differentially expressed genes both in microspores during the late pollen developmental stages and in pistils during the fertilization process in Chinese cabbage（Brassica campestris ssp. chinensis）. Here, antisense‐RNA was used to study the functions of BcPLL10 in Chinese cabbage. Abnormal pollen was identified in the transgenic lines（bcpll10‐4, ‐5, and ‐6）. In fertilization experiments, fewer seeds were harvested when the antisense‐RNA lines were used as pollen donor. In vivo and in vitro pollen germination assays less germinated pollen tubes were observed in bcpll10 lines. Scanning electron microscopy observation verified that the tryphine materials were over accumulated around the pollen surface and sticked them together in bcpll10.Moreover, transmission electron microscopy observation revealed that the internal endintine was overdeveloped and predominantly occupied the intine, and disturbed thenormal proportional distribution of the two layers in the non‐germinal furrow region; and no obvious demarcation existed between them in the germinal furrow region in the bcpll10 pollen. Collectively, this study presented a novel PLL gene that played an important role during the pollen wall development in B. campestris, which may also possess potential importance for male sterility usage in agriculture.
