Rosa x alba is cultivated almost exclusively for the production of aromatic water and fruits widely used as ingredients in some traditional food preparations sold commercially.Results of the proximate and elemental an...Rosa x alba is cultivated almost exclusively for the production of aromatic water and fruits widely used as ingredients in some traditional food preparations sold commercially.Results of the proximate and elemental analyses revealed that flowers exhibited higher moisture content while the dry matter content was higher in leaves.Total fat and ash was higher in fruits when compared with leaves and flowers.All studied organs were found to be rich in essential mineral such as K,Ca,P and Mg.Qualitative and quantitative analysis of the volatile oils revealed different composition patterns between organs.Linalool and geraniol were found as major constituents of the leaf oil whereas 2-phenethyl alcohol and eugenol were the major constituents of the floral oil.In contrast,fruits showed very distinct composition and alkanes/alkenes were found to have the major contribution.The present composition could justify the traditional use of Rosa x alba which could be considered as a potential source of essential minerals and volatile constituents.展开更多
Rare earth elements (REEs) are beneficial in developing modern technologies, especially electronics. Their extractions from natural deposits and their recycling require chemical processes that should be monitored rega...Rare earth elements (REEs) are beneficial in developing modern technologies, especially electronics. Their extractions from natural deposits and their recycling require chemical processes that should be monitored regarding efficiency and environmental sustainability. The purpose of this study is to develop impedimetric sensors for the sensitive detection of the rare earth elements La and Ce by modifying a platinum electrode with four isosorbide-based oligo (ether sulfone)s. These oligomers, functionalized with different end groups (hydroxyl, fluor, amine, maleimide), were obtained with satisfactory yields, starting from isosorbide and bis (4-fuorophenyl) sulphone monomers. The resulting oligomers were characterized by NMR, DSC, and ATG analysis. The dihydroxy-oligo (ether sulfone) modified sensor showed the highest analytical performance compared to the other oligomers. The detection limit is 10−9 M for La and 3 × 10−9 M for Ce which is lower than that of most of the published electrochemical sensors.展开更多
Past builders have developed very low-embodied energy construction techniques optimizing the use of local building materials.These techniques are a source of inspiration for modern sustainable building.Unfortunately,t...Past builders have developed very low-embodied energy construction techniques optimizing the use of local building materials.These techniques are a source of inspiration for modern sustainable building.Unfortunately,this know-how was orally transmitted and was lost as earth construction fell into disuse during the 20th century in European countries.The absence of written documents makes necessary to use an archaeological approach in order to rediscover these construction strategies.Micromorphological analysis of thin sections collacted in earth building walls was used for the first time to describe cob construction technique and highlighted several typical pedofeatures allowing to clearly identifying this process.Finally,a first comparison of the cob and rammed earth micromorphological features permitted to identify two key factors to distinguish these two techniques,the manufacturing state(solid or plastic)and the organization of the material in the wall.展开更多
文摘Rosa x alba is cultivated almost exclusively for the production of aromatic water and fruits widely used as ingredients in some traditional food preparations sold commercially.Results of the proximate and elemental analyses revealed that flowers exhibited higher moisture content while the dry matter content was higher in leaves.Total fat and ash was higher in fruits when compared with leaves and flowers.All studied organs were found to be rich in essential mineral such as K,Ca,P and Mg.Qualitative and quantitative analysis of the volatile oils revealed different composition patterns between organs.Linalool and geraniol were found as major constituents of the leaf oil whereas 2-phenethyl alcohol and eugenol were the major constituents of the floral oil.In contrast,fruits showed very distinct composition and alkanes/alkenes were found to have the major contribution.The present composition could justify the traditional use of Rosa x alba which could be considered as a potential source of essential minerals and volatile constituents.
文摘Rare earth elements (REEs) are beneficial in developing modern technologies, especially electronics. Their extractions from natural deposits and their recycling require chemical processes that should be monitored regarding efficiency and environmental sustainability. The purpose of this study is to develop impedimetric sensors for the sensitive detection of the rare earth elements La and Ce by modifying a platinum electrode with four isosorbide-based oligo (ether sulfone)s. These oligomers, functionalized with different end groups (hydroxyl, fluor, amine, maleimide), were obtained with satisfactory yields, starting from isosorbide and bis (4-fuorophenyl) sulphone monomers. The resulting oligomers were characterized by NMR, DSC, and ATG analysis. The dihydroxy-oligo (ether sulfone) modified sensor showed the highest analytical performance compared to the other oligomers. The detection limit is 10−9 M for La and 3 × 10−9 M for Ce which is lower than that of most of the published electrochemical sensors.
基金The authors want to acknowledge Dr.Ashish Shukla of Coventry University for his kind proofreading of the manuscript.
文摘Past builders have developed very low-embodied energy construction techniques optimizing the use of local building materials.These techniques are a source of inspiration for modern sustainable building.Unfortunately,this know-how was orally transmitted and was lost as earth construction fell into disuse during the 20th century in European countries.The absence of written documents makes necessary to use an archaeological approach in order to rediscover these construction strategies.Micromorphological analysis of thin sections collacted in earth building walls was used for the first time to describe cob construction technique and highlighted several typical pedofeatures allowing to clearly identifying this process.Finally,a first comparison of the cob and rammed earth micromorphological features permitted to identify two key factors to distinguish these two techniques,the manufacturing state(solid or plastic)and the organization of the material in the wall.
