The Nano-Micro Letters(2024)16:193,article by Shangguan et al.,entitled“Making the Complicated Simple:A Minimizing Carrier Strategy on Innovative Nanopesticides”(Nano-Micro Lett.https://doi.org/10.1007/s40820-024-01...The Nano-Micro Letters(2024)16:193,article by Shangguan et al.,entitled“Making the Complicated Simple:A Minimizing Carrier Strategy on Innovative Nanopesticides”(Nano-Micro Lett.https://doi.org/10.1007/s40820-024-01413-5),was published online on 14 May,2024,with errors.The structural formulas and captions of the three acyl chlorides in Fig.3A were wrong.They should be as shown below.展开更多
A convenient,cost-effective and fast method using dynamic microwave-assisted extraction and liquid phase microextraction based on the solidification of a floating drop was proposed to analyze organochlorine pesticides...A convenient,cost-effective and fast method using dynamic microwave-assisted extraction and liquid phase microextraction based on the solidification of a floating drop was proposed to analyze organochlorine pesticides in grains including rice,maize and millet.Twelve samples can be processed simultaneously in the method.During the extraction process,10%acetonitrile-water solutions containing 110μL of n-hexadecane were used to extract organochlorine pesticides.Subsequently,1.0 g sodium chloride was placed in the extract,and then centrifuged and cooled.The n-hexadecane drops containing the analytes were solidifi ed and transferred for determination by gas chromatography-electron capture detector without any further filtration or cleaning process.Limits of detection for organochlorine pesticides were 0.97–1.01μg/kg and the RSDs were in the range of 2.6%–8.5%.The developed technology has succeeded in analyzing six real grains samples and the recoveries of the organochlorine pesticides were 72.2%–94.3%.Compared with the published extraction methods,the developed method was used to analyze organochlorine pesticides in grains,being more environmentally friendly,which is suitable for the daily determination of organochlorine pesticides.展开更多
Aptamers as a kind of biological recognition element have shown great potential in monitoring and the rapid quantification of organophosphorus pesticides(OPPs). However, molecules of OPPs are structurally similar and ...Aptamers as a kind of biological recognition element have shown great potential in monitoring and the rapid quantification of organophosphorus pesticides(OPPs). However, molecules of OPPs are structurally similar and original aptamers selected by systematic evolution of ligands by exponential enrichment are usually long-chain bases, which hamper the further application under OPPs-aptamer recognition. The aim of the research was to develop a new strategy to design oligonucleotide sequences for binding OPPs by combination of experimental and molecular modeling methods. 3D models of aptamers binding OPPs were constructed, and binding energy and the most probable binding site for the OPPs were then determined by molecular docking, and the binding sites were further confirmed by the results of 2-AP replaced experiments. Based on the docking results, a new aptamer for detection 4 representative OPPs with only 29 bases was designed by reasonable truncation and mutation of the reported aptamer(named S4-29). The interaction between this new aptamer and OPPs were analyzed by molecular docking, microscale thermophoresis, circular dichroism and fluorometric analysis. The results revealed that the new aptamer exhibit more superior recognition performance to OPPs, which can be promote the monitoring ability of OPPs contaminations in food.展开更多
Objective Pesticides has gain an increasing awareness because of it is becoming a serious environmental problem and come to threaten the health of humanbeing.The effect of five pesticides(zineb,copforce,the mixture of...Objective Pesticides has gain an increasing awareness because of it is becoming a serious environmental problem and come to threaten the health of humanbeing.The effect of five pesticides(zineb,copforce,the mixture of carbendazim and mancozeb,hymexazol)on soil bacteria,fungi,actinomyces,and Five specific enzymes were chosen for investigation(urease,dehydrogenase,invertase,acid phosphates and protease).Methods The enumeration of the soil micro flora was done by the dilution plate method;The enzyme activity was determined by traditional methods.Shannon-Wiener index as well as 16S rRNA-PCR amplification and DGGE fingerprinting was used for detection of shift in microbial community diversity in pesticides contaminated agricultural soil.Results The outcome showed that the microbial diversity was significantly changed after the application of pesticides,the effect of pesticides on microbe had a order from top to bottom:bacteria-actinomyces-fungi.Conclusions Our results indicate that the use of the pesticides hymexazol resulted in an altered soil community structure,in particular for the actinomyces.Invertase was markedly inhibited by hymexazol,zineb,carbendazim and mancozeb and the inhibiting rates were varied between 30.30% and 21.21%;Urease activity was also inhibited significantly by hymexazol,the inhibiting rate was 37.67%;Protease activity was markedly inhibited by zineb and hymexazol,the inhibiting rates were 27.27% and 18.18% respectively;Phosphates activity was inhibited significantly by hymexazol,zineb,carbendazim and mancozeb,the inhibiting rates were range from 22.12%-3.54%;Dehydrogenase activity was not significantly affected by pesticides.Meanwhile,the correlation of all indexes were analyzed,the data suggested that all indexes existed certain correlation.展开更多
Applying the micronucleus technique T.adescanlia paludosa, the mutagenicity of five pesticides, Decis, Sumicid, Cypermethrin, Trichlorphon and Diazinon were tested. The testing results showed that 0.64%, 0.32%, 0.16%,...Applying the micronucleus technique T.adescanlia paludosa, the mutagenicity of five pesticides, Decis, Sumicid, Cypermethrin, Trichlorphon and Diazinon were tested. The testing results showed that 0.64%, 0.32%, 0.16%, 0.08% of Decis, 0.64%, 0.32%, 0. 16%, 0.04% of Trichlorphon and 0.32%, 0.16%, 0.08%, 0.04% of Diazinon all had mutagenicity on Tradescantia paludosa, but Sumicid and Cypermethrin had no such characteristic.展开更多
Organophosphorus pesticides(OPPs)in foods pose a serious threat to human health,motivating the development of novel analytical methods for their rapid detection and quantification.A magnetic covalent organic framework...Organophosphorus pesticides(OPPs)in foods pose a serious threat to human health,motivating the development of novel analytical methods for their rapid detection and quantification.A magnetic covalent organic framework(M-COF)adsorbent for the magnetic solid-phase extraction(MSPE)of OPPs from foods was reported.M-COF was synthesized by the Schiff base condensation reaction of 1,3,5-tris(4-aminophenyl)benzene and 4,4-biphenyldicarboxaldehyde on the surface of amino-functionalized magnetic nanoparticles.Density functional theory(DFT)calculations showed that adsorption of OPPs onto the surface of M-COF involved hydrophobic effects,van der Waals interactions,π-πinteractions,halogen-N bonding,and hydrogen bonding.Combined with gas chromatography-mass spectrometry(GC-MS)technology,the MSPE method features low limits of detection for OPPs(0.002-0.015μg/L),good reproducibility(1.45%-6.14%),wide linear detection range(0.01-1μg/L,R≥0.9935),and satisfactory recoveries(87.3%-110.4%).The method was successfully applied for the trace analysis of OPPs in spiked fruit juices.展开更多
A GC-MS method for the determination of 27 organochlorine pesticides and 15 Pyrethroid pesticides in animal food is established.The method was based on Gel Permeation chromatography combined with solid-phase extractio...A GC-MS method for the determination of 27 organochlorine pesticides and 15 Pyrethroid pesticides in animal food is established.The method was based on Gel Permeation chromatography combined with solid-phase extraction for sample preparation.Rapid qualitative and quantitative analyses was carried out by gas chromatography-mass spectrometry under the selective-ion monitoring mode.The experimental results showed that the correlation coefficients were better than 0.99,the recoveries for spiked standards were 70%-104%,the relative standard deviations were 2.1%-15.9%.展开更多
A new method was developed for determination of 407 pesticide residues in complex matrix by using LC-MS with triple quadrupole(QQQ).Comparing with regular method,the method has high sensitivity and repeativity,and was...A new method was developed for determination of 407 pesticide residues in complex matrix by using LC-MS with triple quadrupole(QQQ).Comparing with regular method,the method has high sensitivity and repeativity,and was applied for the determination of peticide in real sample with satisfactory results.展开更多
An efficient and selective analytical method for the determination of 8 organochlorines pesticides residues(α-666,β-666,γ-666,δ-666,op’-DDT,pp’-DDT,pp’-DDD,pp’-DDE) in coffee has been developed.The cof...An efficient and selective analytical method for the determination of 8 organochlorines pesticides residues(α-666,β-666,γ-666,δ-666,op’-DDT,pp’-DDT,pp’-DDD,pp’-DDE) in coffee has been developed.The coffee samples were extracted with hexane-acetone(1 ∶1,by volume) according to a selective extraction step using accelerated solvent extraction(ASE),followed by a clean-up by gel permeation chromatography(GPC) and a column combined with Florisil and GCB.Identification and quantification were performed using gas chromatography with negative chemical ionization mass spectrometric detection(GC-NCI MS).The method detection limits varied between 0.002 and 0.069 ng/g.The calibration curves showed a good linearity for all OCPs(r≥0.999 5) under a concentration of 0.20-50.0 μg/L.When the spiked levels were 0.5 μg/L and 5 μg/L,the average recoveries were range of 94%-110% with RSD of 3.5%-10.6%.The method was accurate,sensitive and suitable for the analysis of pesticides.展开更多
The spectrum user’s librarys containing 1533 familiar toxicants have been built; A method with high separability and sensitivity has been found,The RT and the detection limit of 210 familiar abuse drugs has been conf...The spectrum user’s librarys containing 1533 familiar toxicants have been built; A method with high separability and sensitivity has been found,The RT and the detection limit of 210 familiar abuse drugs has been confirmed; the processing methods to analyse spectrum data automatically have been found; It is simple,quick,sensitive and reliable,and can take place of manual operation,It is very useful to screen the familiar toxicants in unkown sample.展开更多
The paper is to study the main co-extractions existing in multiresidue analysis of pesticides in vegetables.For this,extracted 10 vegetable and analyzed the extractions with GC-MS.Compared the spectra of those co-extr...The paper is to study the main co-extractions existing in multiresidue analysis of pesticides in vegetables.For this,extracted 10 vegetable and analyzed the extractions with GC-MS.Compared the spectra of those co-extractions in different vegetables,confirm the main co-extractions of vegetables.The result shows the co-extractions are same including pigment,phenols,fat acids,lipin and steroid.But the mass of those co-extractions in different vegetable is different.The study result is help for the development of pesticide residue method.展开更多
A new method was developed for the simultaneous analysis of 12 pesticide residues in onion and fennel by gas chromatography(GC)-triple quadrupole mass spectrometry(MS/MS)-electron impact ion source(EI)-select reaction...A new method was developed for the simultaneous analysis of 12 pesticide residues in onion and fennel by gas chromatography(GC)-triple quadrupole mass spectrometry(MS/MS)-electron impact ion source(EI)-select reaction monitoring mode(SRM).The 12 pesticide includes fungicide,acaricide,carbamate and plant growth regulator pesticide.The complicated matrix samples of onion and fennel were extracted by acetonitrile,cleaned up by solid phase extraction of Carb/PSA.By optimizing the GC-MS/MS-SRM parameters,the interference from clean-up procedure was further removed and 12 pesticide residues were determined accurately.The average recoveries for most pesticides(at the spiked level of 0.05-0.20 mg/kg) were between 114%-156%,the relative standard deviation(RSD) of the method was less than 20%,and the limit of detection were 0.5-5 μg/kg.展开更多
To establish a new GC-MS/MS method for quantitative detection of 22 kinds of pesticide in fruit and vegetable including organic phosphorus,carbamate & pyrethrin etc.Working was performed by Xcalibur software with ...To establish a new GC-MS/MS method for quantitative detection of 22 kinds of pesticide in fruit and vegetable including organic phosphorus,carbamate & pyrethrin etc.Working was performed by Xcalibur software with multitask mode.We Carried on qualitative and quantitative analysis to mass spectrum of MS/MS in order to obtained a credible experiment result.This method is sensitive and accurate,it is suitable for determination of multifarious pesticide residues.展开更多
Twenty-four provenances of two species （Azadirachta siamensis and Azadirachta indica） have been introduced to China from South Asia, Southeast Asia and Africa Since 1995. This paper summarizes the researches on the ...Twenty-four provenances of two species （Azadirachta siamensis and Azadirachta indica） have been introduced to China from South Asia, Southeast Asia and Africa Since 1995. This paper summarizes the researches on the introduction and planting of Azadirachta indica and analyzes the morphological, phenological characteristics, the growth rhythm, pollinating and seed yielding features of the intro- duced 24 provenances of the two species as well as the variations of filial generation plants. The experiments showed that most of the prove- nances of,4. indica have normal growth and can blossom and fruit in the dry-hot valleys with tropical climate conditions in Yunnan Province, China. The normal regions for A. indica were classified and the selection criteria for superior plants were put forward in this paper, more- over, the major contents of industry planning and technical approaches for A. indica plantation establishment were discussed and the countermeasures to reduce the neem-based pesticide products were also proposed.展开更多
MXenes are emerging transition metal carbides and nitrides-based 2D conductive materials.They have found wide applications in sensors due to their excellent valuable properties.This paper reviews the recent research s...MXenes are emerging transition metal carbides and nitrides-based 2D conductive materials.They have found wide applications in sensors due to their excellent valuable properties.This paper reviews the recent research status of MXene-based electrochemical(bio)sensors for detecting biomarkers,pesticides,and other aspects.The first part of this paper introduced the synthesis strategy and the effect of surface modification on various prop-erties of MXenes.The second part of this paper discussed the application of MXenes as electrode modifiers for detecting pesticides,environmental pollutants,and biomarkers such as glucose,hydrogen peroxide,etc.Hope this review will inspire more efforts toward research on MXene-based sensors to meet the growing requirements.展开更多
Host plants of domesticated silkworms in tropical countries are attacked by an array of insect pests, disease pathogens and nematodes. In order to reduce resulting plant damage, chemicals have been extensively used. I...Host plants of domesticated silkworms in tropical countries are attacked by an array of insect pests, disease pathogens and nematodes. In order to reduce resulting plant damage, chemicals have been extensively used. In recent years, products extracted/isolated from 47 plant species have been tested as replacements for or to minimize the use of hazardous chemicals. Bioefficacy of the extract in water or chemical solvent, crude seed/leaf oil, and cake is discussed, and integrated management of major and occasional pests and plant diseases is proposed in sericultural plants in order to produce chemical-free foliage.展开更多
文摘The Nano-Micro Letters(2024)16:193,article by Shangguan et al.,entitled“Making the Complicated Simple:A Minimizing Carrier Strategy on Innovative Nanopesticides”(Nano-Micro Lett.https://doi.org/10.1007/s40820-024-01413-5),was published online on 14 May,2024,with errors.The structural formulas and captions of the three acyl chlorides in Fig.3A were wrong.They should be as shown below.
基金The study was financially supported by the National Science and Technology Support Program of China(Grant No.2013BAD16B08).
文摘A convenient,cost-effective and fast method using dynamic microwave-assisted extraction and liquid phase microextraction based on the solidification of a floating drop was proposed to analyze organochlorine pesticides in grains including rice,maize and millet.Twelve samples can be processed simultaneously in the method.During the extraction process,10%acetonitrile-water solutions containing 110μL of n-hexadecane were used to extract organochlorine pesticides.Subsequently,1.0 g sodium chloride was placed in the extract,and then centrifuged and cooled.The n-hexadecane drops containing the analytes were solidifi ed and transferred for determination by gas chromatography-electron capture detector without any further filtration or cleaning process.Limits of detection for organochlorine pesticides were 0.97–1.01μg/kg and the RSDs were in the range of 2.6%–8.5%.The developed technology has succeeded in analyzing six real grains samples and the recoveries of the organochlorine pesticides were 72.2%–94.3%.Compared with the published extraction methods,the developed method was used to analyze organochlorine pesticides in grains,being more environmentally friendly,which is suitable for the daily determination of organochlorine pesticides.
基金supported by the National Natural Science Foundation of China (31801647)Sichuan Science and Technology Program (2018JY0194,2020YFN0153,2020YFN0151)。
文摘Aptamers as a kind of biological recognition element have shown great potential in monitoring and the rapid quantification of organophosphorus pesticides(OPPs). However, molecules of OPPs are structurally similar and original aptamers selected by systematic evolution of ligands by exponential enrichment are usually long-chain bases, which hamper the further application under OPPs-aptamer recognition. The aim of the research was to develop a new strategy to design oligonucleotide sequences for binding OPPs by combination of experimental and molecular modeling methods. 3D models of aptamers binding OPPs were constructed, and binding energy and the most probable binding site for the OPPs were then determined by molecular docking, and the binding sites were further confirmed by the results of 2-AP replaced experiments. Based on the docking results, a new aptamer for detection 4 representative OPPs with only 29 bases was designed by reasonable truncation and mutation of the reported aptamer(named S4-29). The interaction between this new aptamer and OPPs were analyzed by molecular docking, microscale thermophoresis, circular dichroism and fluorometric analysis. The results revealed that the new aptamer exhibit more superior recognition performance to OPPs, which can be promote the monitoring ability of OPPs contaminations in food.
文摘Objective Pesticides has gain an increasing awareness because of it is becoming a serious environmental problem and come to threaten the health of humanbeing.The effect of five pesticides(zineb,copforce,the mixture of carbendazim and mancozeb,hymexazol)on soil bacteria,fungi,actinomyces,and Five specific enzymes were chosen for investigation(urease,dehydrogenase,invertase,acid phosphates and protease).Methods The enumeration of the soil micro flora was done by the dilution plate method;The enzyme activity was determined by traditional methods.Shannon-Wiener index as well as 16S rRNA-PCR amplification and DGGE fingerprinting was used for detection of shift in microbial community diversity in pesticides contaminated agricultural soil.Results The outcome showed that the microbial diversity was significantly changed after the application of pesticides,the effect of pesticides on microbe had a order from top to bottom:bacteria-actinomyces-fungi.Conclusions Our results indicate that the use of the pesticides hymexazol resulted in an altered soil community structure,in particular for the actinomyces.Invertase was markedly inhibited by hymexazol,zineb,carbendazim and mancozeb and the inhibiting rates were varied between 30.30% and 21.21%;Urease activity was also inhibited significantly by hymexazol,the inhibiting rate was 37.67%;Protease activity was markedly inhibited by zineb and hymexazol,the inhibiting rates were 27.27% and 18.18% respectively;Phosphates activity was inhibited significantly by hymexazol,zineb,carbendazim and mancozeb,the inhibiting rates were range from 22.12%-3.54%;Dehydrogenase activity was not significantly affected by pesticides.Meanwhile,the correlation of all indexes were analyzed,the data suggested that all indexes existed certain correlation.
文摘Applying the micronucleus technique T.adescanlia paludosa, the mutagenicity of five pesticides, Decis, Sumicid, Cypermethrin, Trichlorphon and Diazinon were tested. The testing results showed that 0.64%, 0.32%, 0.16%, 0.08% of Decis, 0.64%, 0.32%, 0. 16%, 0.04% of Trichlorphon and 0.32%, 0.16%, 0.08%, 0.04% of Diazinon all had mutagenicity on Tradescantia paludosa, but Sumicid and Cypermethrin had no such characteristic.
基金supported by Key Research and Development Project of Shandong Province(2021ZDSYS12)National Natural Science Foundation of China(22076086,21777089)+3 种基金Taishan Scholar Program of Shandong Province(ts20190948)Shandong Province Science and Technology Small and Medium Enterprises Innovation Ability Enhancement Project(2023TSGC0689,2023TSGC0055)Natural Science Foundation of Shandong Province(ZR2021MB086,ZR2023QB035)Jinan City University and Institute Innovation Team Project(2021GXRC061,20228045,202333027)。
文摘Organophosphorus pesticides(OPPs)in foods pose a serious threat to human health,motivating the development of novel analytical methods for their rapid detection and quantification.A magnetic covalent organic framework(M-COF)adsorbent for the magnetic solid-phase extraction(MSPE)of OPPs from foods was reported.M-COF was synthesized by the Schiff base condensation reaction of 1,3,5-tris(4-aminophenyl)benzene and 4,4-biphenyldicarboxaldehyde on the surface of amino-functionalized magnetic nanoparticles.Density functional theory(DFT)calculations showed that adsorption of OPPs onto the surface of M-COF involved hydrophobic effects,van der Waals interactions,π-πinteractions,halogen-N bonding,and hydrogen bonding.Combined with gas chromatography-mass spectrometry(GC-MS)technology,the MSPE method features low limits of detection for OPPs(0.002-0.015μg/L),good reproducibility(1.45%-6.14%),wide linear detection range(0.01-1μg/L,R≥0.9935),and satisfactory recoveries(87.3%-110.4%).The method was successfully applied for the trace analysis of OPPs in spiked fruit juices.
文摘A GC-MS method for the determination of 27 organochlorine pesticides and 15 Pyrethroid pesticides in animal food is established.The method was based on Gel Permeation chromatography combined with solid-phase extraction for sample preparation.Rapid qualitative and quantitative analyses was carried out by gas chromatography-mass spectrometry under the selective-ion monitoring mode.The experimental results showed that the correlation coefficients were better than 0.99,the recoveries for spiked standards were 70%-104%,the relative standard deviations were 2.1%-15.9%.
文摘A new method was developed for determination of 407 pesticide residues in complex matrix by using LC-MS with triple quadrupole(QQQ).Comparing with regular method,the method has high sensitivity and repeativity,and was applied for the determination of peticide in real sample with satisfactory results.
文摘An efficient and selective analytical method for the determination of 8 organochlorines pesticides residues(α-666,β-666,γ-666,δ-666,op’-DDT,pp’-DDT,pp’-DDD,pp’-DDE) in coffee has been developed.The coffee samples were extracted with hexane-acetone(1 ∶1,by volume) according to a selective extraction step using accelerated solvent extraction(ASE),followed by a clean-up by gel permeation chromatography(GPC) and a column combined with Florisil and GCB.Identification and quantification were performed using gas chromatography with negative chemical ionization mass spectrometric detection(GC-NCI MS).The method detection limits varied between 0.002 and 0.069 ng/g.The calibration curves showed a good linearity for all OCPs(r≥0.999 5) under a concentration of 0.20-50.0 μg/L.When the spiked levels were 0.5 μg/L and 5 μg/L,the average recoveries were range of 94%-110% with RSD of 3.5%-10.6%.The method was accurate,sensitive and suitable for the analysis of pesticides.
文摘The spectrum user’s librarys containing 1533 familiar toxicants have been built; A method with high separability and sensitivity has been found,The RT and the detection limit of 210 familiar abuse drugs has been confirmed; the processing methods to analyse spectrum data automatically have been found; It is simple,quick,sensitive and reliable,and can take place of manual operation,It is very useful to screen the familiar toxicants in unkown sample.
文摘The paper is to study the main co-extractions existing in multiresidue analysis of pesticides in vegetables.For this,extracted 10 vegetable and analyzed the extractions with GC-MS.Compared the spectra of those co-extractions in different vegetables,confirm the main co-extractions of vegetables.The result shows the co-extractions are same including pigment,phenols,fat acids,lipin and steroid.But the mass of those co-extractions in different vegetable is different.The study result is help for the development of pesticide residue method.
文摘A new method was developed for the simultaneous analysis of 12 pesticide residues in onion and fennel by gas chromatography(GC)-triple quadrupole mass spectrometry(MS/MS)-electron impact ion source(EI)-select reaction monitoring mode(SRM).The 12 pesticide includes fungicide,acaricide,carbamate and plant growth regulator pesticide.The complicated matrix samples of onion and fennel were extracted by acetonitrile,cleaned up by solid phase extraction of Carb/PSA.By optimizing the GC-MS/MS-SRM parameters,the interference from clean-up procedure was further removed and 12 pesticide residues were determined accurately.The average recoveries for most pesticides(at the spiked level of 0.05-0.20 mg/kg) were between 114%-156%,the relative standard deviation(RSD) of the method was less than 20%,and the limit of detection were 0.5-5 μg/kg.
文摘To establish a new GC-MS/MS method for quantitative detection of 22 kinds of pesticide in fruit and vegetable including organic phosphorus,carbamate & pyrethrin etc.Working was performed by Xcalibur software with multitask mode.We Carried on qualitative and quantitative analysis to mass spectrum of MS/MS in order to obtained a credible experiment result.This method is sensitive and accurate,it is suitable for determination of multifarious pesticide residues.
基金National Science & Technology Supporting Project (2006BAD18B03)Science & Technology Plan Projects of Yunnan province (2005YX20)
文摘Twenty-four provenances of two species （Azadirachta siamensis and Azadirachta indica） have been introduced to China from South Asia, Southeast Asia and Africa Since 1995. This paper summarizes the researches on the introduction and planting of Azadirachta indica and analyzes the morphological, phenological characteristics, the growth rhythm, pollinating and seed yielding features of the intro- duced 24 provenances of the two species as well as the variations of filial generation plants. The experiments showed that most of the prove- nances of,4. indica have normal growth and can blossom and fruit in the dry-hot valleys with tropical climate conditions in Yunnan Province, China. The normal regions for A. indica were classified and the selection criteria for superior plants were put forward in this paper, more- over, the major contents of industry planning and technical approaches for A. indica plantation establishment were discussed and the countermeasures to reduce the neem-based pesticide products were also proposed.
文摘MXenes are emerging transition metal carbides and nitrides-based 2D conductive materials.They have found wide applications in sensors due to their excellent valuable properties.This paper reviews the recent research status of MXene-based electrochemical(bio)sensors for detecting biomarkers,pesticides,and other aspects.The first part of this paper introduced the synthesis strategy and the effect of surface modification on various prop-erties of MXenes.The second part of this paper discussed the application of MXenes as electrode modifiers for detecting pesticides,environmental pollutants,and biomarkers such as glucose,hydrogen peroxide,etc.Hope this review will inspire more efforts toward research on MXene-based sensors to meet the growing requirements.
文摘Host plants of domesticated silkworms in tropical countries are attacked by an array of insect pests, disease pathogens and nematodes. In order to reduce resulting plant damage, chemicals have been extensively used. In recent years, products extracted/isolated from 47 plant species have been tested as replacements for or to minimize the use of hazardous chemicals. Bioefficacy of the extract in water or chemical solvent, crude seed/leaf oil, and cake is discussed, and integrated management of major and occasional pests and plant diseases is proposed in sericultural plants in order to produce chemical-free foliage.
