Microorganism-mediated, hexadecyltrimethylammonium chloride （CTAC）-directed （MCD） method was employed in this work to synthesize Pd nanoflowers （PdNFs）. Proper Pichia postoris cells （PPCs） dosage, ascorbic ac...Microorganism-mediated, hexadecyltrimethylammonium chloride （CTAC）-directed （MCD） method was employed in this work to synthesize Pd nanoflowers （PdNFs）. Proper Pichia postoris cells （PPCs） dosage, ascorbic acid （AA）, Pd（N03）2 and CrAC concentrations were essential for the growth of the PdNFs. The size of the as- synthesized PdNFs could be tuned by adjusting the amount of Pal（N03）2 solution and dosage of PPCs used. Characterization techniques such as X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy were used to verify the nature of the PdNFs. Finally the PdNF/PPC nanocomposites were immobilized onto TiO2 supports to obtain bio-PdNF/Ti02 catalysts which showed excellent catalytic activity for CO oxidation, obtaining 100%; conversion at 100 ℃ and remaining stable over a period of 52 h of reaction time. @ 2015 The Chemical Industry and Engineering Sodety of China, and Chemical Industry Press. All rights reserved.展开更多
Soil microbiomes play a crucial role in ecosystem functioning,yet knowledge about region-specific bacterial taxa across diverse soil types,particularly at a continental scale,remains uncertain.This study employs 16S r...Soil microbiomes play a crucial role in ecosystem functioning,yet knowledge about region-specific bacterial taxa across diverse soil types,particularly at a continental scale,remains uncertain.This study employs 16S rRNA sequencing to analyze 141 soil samples collected along a 1400 km transect in New South Wales,Australia,revealing distinct bacterial communities adapted to the varying climatic and soil conditions from east to west.The transect is characterised by three unique pedo-climatic zones:>900 mm mean annual precipitation in the eastern region,900300 mm in the central region,and<300 mm in the western region.These variations in climate and soil properties,particularly soil pH,organic carbon,and precipitation,significantly influence bacterial diversity and composition.We identified regionally enriched taxa,including Verrucomicrobia in the eastern,Chloroflexi in the central,and Gemmatimonadetes in the western,demonstrating the adaptation of microbial communities to local environmental conditions.Additionally,our findings show that increasing land use intensity,particularly in agricultural areas,correlates with higher Actinobacteria abundance and leads to more homogenised and interconnected microbial networks.This study provides new insights into the biogeography of soil bacteria in Australia,highlighting the importance of local environmental factors in shaping microbial community structure and offering valuable information for ecological and agricultural management strategies.展开更多
多方量子安全直接通信(multi-party quantum secure direct communication,MQSDC)可使多个信息发送方通过量子信道同时向一个信息接收方传递秘密信息,并从理论上保证传递信息的绝对安全性.已有的MQSDC方案均默认所有通信方为合法通信方...多方量子安全直接通信(multi-party quantum secure direct communication,MQSDC)可使多个信息发送方通过量子信道同时向一个信息接收方传递秘密信息,并从理论上保证传递信息的绝对安全性.已有的MQSDC方案均默认所有通信方为合法通信方,这在实际实验条件下难以保证,为窃听者冒充合法通信方窃取信息或扰乱通信提供了可能.本文提出了基于Greenberger-Horne-Zeilinger(GHZ)态的具有身份认证功能的三方量子安全直接通信方案.信息接收方可同时认证两个实际信息发送方的身份,确认身份合法后,再接收其发送的秘密信息,理论上可保证合法通信方身份认证码以及传输信息的安全.本方案使用单光子测量代替GHZ态测量,操作简单且成功率高.本文对方案在实际实验条件下的安全信息容量进行了数值模拟.本方案在未来量子网络领域具有重要的应用.展开更多
基金Supported by the National Natural Science Foundation of China （21106117, 21036004）.
文摘Microorganism-mediated, hexadecyltrimethylammonium chloride （CTAC）-directed （MCD） method was employed in this work to synthesize Pd nanoflowers （PdNFs）. Proper Pichia postoris cells （PPCs） dosage, ascorbic acid （AA）, Pd（N03）2 and CrAC concentrations were essential for the growth of the PdNFs. The size of the as- synthesized PdNFs could be tuned by adjusting the amount of Pal（N03）2 solution and dosage of PPCs used. Characterization techniques such as X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy were used to verify the nature of the PdNFs. Finally the PdNF/PPC nanocomposites were immobilized onto TiO2 supports to obtain bio-PdNF/Ti02 catalysts which showed excellent catalytic activity for CO oxidation, obtaining 100%; conversion at 100 ℃ and remaining stable over a period of 52 h of reaction time. @ 2015 The Chemical Industry and Engineering Sodety of China, and Chemical Industry Press. All rights reserved.
文摘Soil microbiomes play a crucial role in ecosystem functioning,yet knowledge about region-specific bacterial taxa across diverse soil types,particularly at a continental scale,remains uncertain.This study employs 16S rRNA sequencing to analyze 141 soil samples collected along a 1400 km transect in New South Wales,Australia,revealing distinct bacterial communities adapted to the varying climatic and soil conditions from east to west.The transect is characterised by three unique pedo-climatic zones:>900 mm mean annual precipitation in the eastern region,900300 mm in the central region,and<300 mm in the western region.These variations in climate and soil properties,particularly soil pH,organic carbon,and precipitation,significantly influence bacterial diversity and composition.We identified regionally enriched taxa,including Verrucomicrobia in the eastern,Chloroflexi in the central,and Gemmatimonadetes in the western,demonstrating the adaptation of microbial communities to local environmental conditions.Additionally,our findings show that increasing land use intensity,particularly in agricultural areas,correlates with higher Actinobacteria abundance and leads to more homogenised and interconnected microbial networks.This study provides new insights into the biogeography of soil bacteria in Australia,highlighting the importance of local environmental factors in shaping microbial community structure and offering valuable information for ecological and agricultural management strategies.
文摘多方量子安全直接通信(multi-party quantum secure direct communication,MQSDC)可使多个信息发送方通过量子信道同时向一个信息接收方传递秘密信息,并从理论上保证传递信息的绝对安全性.已有的MQSDC方案均默认所有通信方为合法通信方,这在实际实验条件下难以保证,为窃听者冒充合法通信方窃取信息或扰乱通信提供了可能.本文提出了基于Greenberger-Horne-Zeilinger(GHZ)态的具有身份认证功能的三方量子安全直接通信方案.信息接收方可同时认证两个实际信息发送方的身份,确认身份合法后,再接收其发送的秘密信息,理论上可保证合法通信方身份认证码以及传输信息的安全.本方案使用单光子测量代替GHZ态测量,操作简单且成功率高.本文对方案在实际实验条件下的安全信息容量进行了数值模拟.本方案在未来量子网络领域具有重要的应用.
