To explore the possibility of absorption of lanthanides via digestive duct and their effects on one membrane structure and permeability of erythrocytes, the fine structure of erythrocyte membrane from Wistar rats, fed...To explore the possibility of absorption of lanthanides via digestive duct and their effects on one membrane structure and permeability of erythrocytes, the fine structure of erythrocyte membrane from Wistar rats, fed for 70 days of daily administration per os with 20 mg CeCl3/kg weight, was imaged by means of atomic force microscopy and FT-IR deconvolution spectra. The results show that, although the erythrocytes maintain the intact shape, the change OT secondary structure, aggregation and crosslinking of the protein particles of membrane surface and the enlarged lipid regions lead to the domain structure formation. This structure might be responsible for the increasing permeability of erythrocyte membrane.展开更多
The thermal decomposition of CeCl3·7 H2O was studied from room temperature to 800 ℃. Analysis was performed by applying TG-DTA, XRD, FESEM, EDXS, and TG-MS technologies to investigate the thermal decomposition m...The thermal decomposition of CeCl3·7 H2O was studied from room temperature to 800 ℃. Analysis was performed by applying TG-DTA, XRD, FESEM, EDXS, and TG-MS technologies to investigate the thermal decomposition mechanism of CeCl3·7 H2O in air atmosphere. Multiple forms of hydrated cerium chloride compound were observed in the dehydration products. The CeCl3hydrolysis product was separated by a continuous centrifugation method and the phase composition was identified as CeO2,Ce(OH)3,and CeCl3·4 H2O by XRD analysis. The evolved gas composition was identified as CI2and HCI by TG-MS system. Based on the analysis of the experimental results, the mechanism of thermal decomposition of CeCl3·7 H2O was proposed with completion of the dehydration reaction at 224 ℃,the hydrolysis reaction at 170-480 ℃,and the oxidation reaction of CeCl3above 480 ℃.展开更多
It remains challenging to achievevaluableplatformchemicals from lignin because of itscomplicated polymeric structure and inherent inert chemical activities.So far,only a fewexamples have been reported for the selectiv...It remains challenging to achievevaluableplatformchemicals from lignin because of itscomplicated polymeric structure and inherent inert chemical activities.So far,only a fewexamples have been reported for the selective cleavage of C–C bonds in lignin due to their intrinsic inertness and ubiquity.Here,we present a simple and commercially available cerium(Ⅲ)chloride(CeCl_(3))-promoted photocatalytic depolymerization strategy to realize the simultaneous cleavage and amination ofC_(α)–C_(β)bond in a variety of lignin model compounds at room temperature.This procedure does not require any pretreatments and breakdown of C–O bonds or loss ofγ-CH_(2)OHgroup to generate aldehydes(up to 97%)and N-containing products(up to 95%)in good to excellent yields.Additionally,this CeCl_(3)-based photocatalyst system could maintain excellent catalytic performance even after 10 sequential cycles with newstarting materials.Moreover,this approach realizes the precise control over the reaction via switching the external light stimuli on/off.Further,this method is effective for the depolymerization of real lignin,thus affording the corresponding cleavage and amination products of C_(α)–C_(β)bonds.展开更多
文摘To explore the possibility of absorption of lanthanides via digestive duct and their effects on one membrane structure and permeability of erythrocytes, the fine structure of erythrocyte membrane from Wistar rats, fed for 70 days of daily administration per os with 20 mg CeCl3/kg weight, was imaged by means of atomic force microscopy and FT-IR deconvolution spectra. The results show that, although the erythrocytes maintain the intact shape, the change OT secondary structure, aggregation and crosslinking of the protein particles of membrane surface and the enlarged lipid regions lead to the domain structure formation. This structure might be responsible for the increasing permeability of erythrocyte membrane.
基金Project supported by the National Natural Science Foundation of China(51274060)National Sci-Tech Support Plan(2012BAE01B02)Basic scientific research business expenses(N150204019)
文摘The thermal decomposition of CeCl3·7 H2O was studied from room temperature to 800 ℃. Analysis was performed by applying TG-DTA, XRD, FESEM, EDXS, and TG-MS technologies to investigate the thermal decomposition mechanism of CeCl3·7 H2O in air atmosphere. Multiple forms of hydrated cerium chloride compound were observed in the dehydration products. The CeCl3hydrolysis product was separated by a continuous centrifugation method and the phase composition was identified as CeO2,Ce(OH)3,and CeCl3·4 H2O by XRD analysis. The evolved gas composition was identified as CI2and HCI by TG-MS system. Based on the analysis of the experimental results, the mechanism of thermal decomposition of CeCl3·7 H2O was proposed with completion of the dehydration reaction at 224 ℃,the hydrolysis reaction at 170-480 ℃,and the oxidation reaction of CeCl3above 480 ℃.
基金supported by the National Natural Science Foundation of China(grant nos.21975102,21871107,and 21774042).
文摘It remains challenging to achievevaluableplatformchemicals from lignin because of itscomplicated polymeric structure and inherent inert chemical activities.So far,only a fewexamples have been reported for the selective cleavage of C–C bonds in lignin due to their intrinsic inertness and ubiquity.Here,we present a simple and commercially available cerium(Ⅲ)chloride(CeCl_(3))-promoted photocatalytic depolymerization strategy to realize the simultaneous cleavage and amination ofC_(α)–C_(β)bond in a variety of lignin model compounds at room temperature.This procedure does not require any pretreatments and breakdown of C–O bonds or loss ofγ-CH_(2)OHgroup to generate aldehydes(up to 97%)and N-containing products(up to 95%)in good to excellent yields.Additionally,this CeCl_(3)-based photocatalyst system could maintain excellent catalytic performance even after 10 sequential cycles with newstarting materials.Moreover,this approach realizes the precise control over the reaction via switching the external light stimuli on/off.Further,this method is effective for the depolymerization of real lignin,thus affording the corresponding cleavage and amination products of C_(α)–C_(β)bonds.
