In this study,we investigated the effects of low salinity(26 and 21) on the prophenoloxidase(proPO) system and related defence parameters in the shrimp Litopenaeus vannamei.The results showed that low salinity induced...In this study,we investigated the effects of low salinity(26 and 21) on the prophenoloxidase(proPO) system and related defence parameters in the shrimp Litopenaeus vannamei.The results showed that low salinity induced a significant increase of dopamine(DA) concentration in haemolymph at 6 h of the experiment;on the other hand,total haemocyte count(THC),differential haemocyte count(DHC) and PO activity decreased over time to the lowest level at 24 h and remained low thereafter.Serine Protease(SP) and Proteinase Inhibitor(PI) activity in the two lower salinity treatments decreased to the lowest level at 12 and 24 h,respectively,and both recovered to the control level at 72 h.In contrast,α2-macroglobulin(α2M) activity in the two lower salinity treatments peaked at 24 h and then decreased to the control level at 72 h.Therefore,it may be concluded that stress-induced DA plays an important temporary role in neurotransmission and causes immune response in L.vannamei in adapting to salinity changes.展开更多
In order to validate the control effects of integrated technology of medicine and fertilizer on tobacco bacterial wilt,field experiments were conducted by using youmeili and tetracycline as the test agents.The results...In order to validate the control effects of integrated technology of medicine and fertilizer on tobacco bacterial wilt,field experiments were conducted by using youmeili and tetracycline as the test agents.The results obtained were listed as follows:(1)The incidence rate of bacterial wilt ascended more quickly after July 10 th,the incidence of CK reached 78.30%on July 25 th.(2)The control effect of“youmeili 3 g+tetramycin 200 times liquid”reached 69.47%,significantly higher than other treatments.(3)The output value of“Youmeil 3 g+tetramycin 200 times liquid”served as 1635.66 yuan/667m^2,with the highest economic character in all treatments.In a word,integrated technology of medicine and fertilizer was a feasible approach to control tobacco bacterial wilt.展开更多
The technical characteristics of Sichuan folk furniture were studied from craft aesthetic perspective. The features of Sichuan folk furniture material, technology and structure were analyzed through literature review,...The technical characteristics of Sichuan folk furniture were studied from craft aesthetic perspective. The features of Sichuan folk furniture material, technology and structure were analyzed through literature review, field investigation and expert interview methods, the technical characteristics of Sichuan folk furniture were re-analyzed from craft aesthetic perspective rather than the traditional material and technique research perspectives. The study shows that Sichuan folk furniture technical features contain not only cultural spirit and aesthetic consciousness, but distinctive aesthetic personality as well. Sichuan folk furniture technical characteristics convey Chinese traditional design philosophy, such as theory is based on objects, and it is highly concentrated and concise of aesthetic sentiment in Sichuan folk aesthetic temperament and interest.展开更多
Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale...Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale with an average diameter of approximately 12 to 18 nm. The introduction of Fe3O4 MNPs increased levofloxacin sono-degradation in the US/H2O2 system. Experimental parameters, such as Fe3O4 MNP dose, initial solution p H, and H2O2 concentration, were investigated by a one-factor-at-a-time approach. The results showed that Fe3O4 MNPs enhanced levofloxacin removal in the p H range from 4.0 to 9.0. Levofloxacin removal ratio increased with Fe3O4 MNP dose up to 1.0 g·L-1and with H2O2 concentration until reaching the maximum. Moreover, three main intermediate compounds were identified by HPLC with electrospray ionisation tandem mass spectrometry, and a possible degradation pathway was proposed. This study suggests that combination of H2O2, Fe3O4 MNPs and US is a good way to improve the degradation efficiency of antibiotics.展开更多
基金supported by the Program for New Century Excellent Talents in University (NCET-06-0597)the project of Transformation and Expansion of Achievement of Agricultural Science and Technology in Tianjin, China (0604020)
文摘In this study,we investigated the effects of low salinity(26 and 21) on the prophenoloxidase(proPO) system and related defence parameters in the shrimp Litopenaeus vannamei.The results showed that low salinity induced a significant increase of dopamine(DA) concentration in haemolymph at 6 h of the experiment;on the other hand,total haemocyte count(THC),differential haemocyte count(DHC) and PO activity decreased over time to the lowest level at 24 h and remained low thereafter.Serine Protease(SP) and Proteinase Inhibitor(PI) activity in the two lower salinity treatments decreased to the lowest level at 12 and 24 h,respectively,and both recovered to the control level at 72 h.In contrast,α2-macroglobulin(α2M) activity in the two lower salinity treatments peaked at 24 h and then decreased to the control level at 72 h.Therefore,it may be concluded that stress-induced DA plays an important temporary role in neurotransmission and causes immune response in L.vannamei in adapting to salinity changes.
基金Supported by Science and Technology Project of Yunnan Tobacco Company(2015YN07,2017YN26)~~
文摘In order to validate the control effects of integrated technology of medicine and fertilizer on tobacco bacterial wilt,field experiments were conducted by using youmeili and tetracycline as the test agents.The results obtained were listed as follows:(1)The incidence rate of bacterial wilt ascended more quickly after July 10 th,the incidence of CK reached 78.30%on July 25 th.(2)The control effect of“youmeili 3 g+tetramycin 200 times liquid”reached 69.47%,significantly higher than other treatments.(3)The output value of“Youmeil 3 g+tetramycin 200 times liquid”served as 1635.66 yuan/667m^2,with the highest economic character in all treatments.In a word,integrated technology of medicine and fertilizer was a feasible approach to control tobacco bacterial wilt.
文摘The technical characteristics of Sichuan folk furniture were studied from craft aesthetic perspective. The features of Sichuan folk furniture material, technology and structure were analyzed through literature review, field investigation and expert interview methods, the technical characteristics of Sichuan folk furniture were re-analyzed from craft aesthetic perspective rather than the traditional material and technique research perspectives. The study shows that Sichuan folk furniture technical features contain not only cultural spirit and aesthetic consciousness, but distinctive aesthetic personality as well. Sichuan folk furniture technical characteristics convey Chinese traditional design philosophy, such as theory is based on objects, and it is highly concentrated and concise of aesthetic sentiment in Sichuan folk aesthetic temperament and interest.
基金Supported by the National Natural Science Foundation of China(51009115)Shaanxi Provincial Department of Education Key Laboratory Project(13JS067)+2 种基金the Hall of Shaanxi Province Science and Technology(2013JK0881)the Research Plan Project of Water Resources Department of Shaanxi Province(2013slkj-07)the Innovation of Science and Technology Fund of Xi'an University of Technology(211302)
文摘Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale with an average diameter of approximately 12 to 18 nm. The introduction of Fe3O4 MNPs increased levofloxacin sono-degradation in the US/H2O2 system. Experimental parameters, such as Fe3O4 MNP dose, initial solution p H, and H2O2 concentration, were investigated by a one-factor-at-a-time approach. The results showed that Fe3O4 MNPs enhanced levofloxacin removal in the p H range from 4.0 to 9.0. Levofloxacin removal ratio increased with Fe3O4 MNP dose up to 1.0 g·L-1and with H2O2 concentration until reaching the maximum. Moreover, three main intermediate compounds were identified by HPLC with electrospray ionisation tandem mass spectrometry, and a possible degradation pathway was proposed. This study suggests that combination of H2O2, Fe3O4 MNPs and US is a good way to improve the degradation efficiency of antibiotics.
