Friedel–Crafts alkylation of benzene with linear chain ole fin(C_(10)–C_(14)),which is an important reaction of synthetic detergent,was studied via different catalysts of aluminum impregnated silica molecular sieves...Friedel–Crafts alkylation of benzene with linear chain ole fin(C_(10)–C_(14)),which is an important reaction of synthetic detergent,was studied via different catalysts of aluminum impregnated silica molecular sieves.AlCl_3 was immobilized on silica molecular sieves with different channel structures,hexagonal packing channels network(SBA-15,MCM-41),and disordered channel network(SiO_2,SiO_2-Gel) by impregnation.XRD and N_2 adsorption–desorption isotherms con firmed that the speci fic mesoporous structures were maintained for order channel network catalyst after impregnation.Catalytic activities were investigated under different conditions.The in fluences of channel structure were discussed.The results showed that catalyst based on mesoporous like SBA-15 had the highest catalytic activities and 2-LAB selectivity compared with other catalysts in this work.The highest 2-LAB selectivity was nearly 50% when 1-dodecene conversion was nearly 100%.At low 1-dodecene conversion or higher benzene/1-dodecene molar ratio,2-LAB selectivity was nearly 60%.展开更多
In order to study the effects of seed soaking with Paclobutrazol( PP333) on the tillering and physiological characteristics of sugarcane seedlings,sugar cane variety ROC22 was used as experimental material. The effect...In order to study the effects of seed soaking with Paclobutrazol( PP333) on the tillering and physiological characteristics of sugarcane seedlings,sugar cane variety ROC22 was used as experimental material. The effects of seed soaking with different concentrations of PP333 were studied. The tiller number and growth of sugarcane were surveyed at the 6-leaf stage,the physiological indicators such as chlorophyll content,soluble protein content,proline content and peroxidase activity were measured at the 2-leaf,4-leaf,and 6-leaf stages. The results showed that the seed soaking with PP333 can effectively improve the tillering of sugarcane seedlings. The suitable concentration for the tillering of sugarcane and the growth and development of sugarcane was of 50 mg/L; the seed soaking with PP333 significantly increased the chlorophyll,soluble protein,proline,and peroxidase activity of leaves of sugarcane seedlings; the content of chlorophyll and soluble protein in leaves of sugarcane seedlings treated with 90 mg/L PP333 was the highest,and the proline content and peroxidase activity of sugarcane treated with 50 mg/L PP333 were the highest.展开更多
Objective Fasting capillary blood glucose(CBG)must be measured before fluorodeoxyglucose-positron emission tomography(FDG-PET)imaging.In this study,we aimed to investigate whether a recently measured fasting venous bl...Objective Fasting capillary blood glucose(CBG)must be measured before fluorodeoxyglucose-positron emission tomography(FDG-PET)imaging.In this study,we aimed to investigate whether a recently measured fasting venous blood glucose(VBG)concentration could be substituted for CBG.Methods This retrospective study included 520 of 1,378 patients who had undergone FDG-PET at our institution in June 2022.None of the study patients had a history of diabetes mellitus.Each study patient’s CBG was measured immediately before FDG administration,whereas the VBG(VBG<7.8 mmol/L)was measured within one week before and after PET imaging.We used Bland−Altman plots to compare the two blood glucose concentrations.Results The 520 participants(315 male,205 female;ages 13-87 years)accounted for 37.7%(520/1378)of all patients.The median CBG and VBG were 5.7 mmol/L(interquartile range,5.2-6.2 mmol/L)and 5.1 mmol/L(interquartile range,4.8-5.8 mmol/L),respectively.There was a moderate positive correlation between CBG and VBG(r=0.4370,95%CI:0.3625-0.5059,P<0.0001).Bland-Altman plots revealed that only 5.8%(30/520)of the dots exceeded the 95%limits of agreement and these were all within acceptable limits,indicating that the bias was not clinically significant.Conclusion When performing FDG-PET on patients without diabetes,a VBG of<7.8 mmol/L within the previous week may be an acceptable alternative to CBG.展开更多
基金Supported by the National Natural Science Foundation of China(U1362102)
文摘Friedel–Crafts alkylation of benzene with linear chain ole fin(C_(10)–C_(14)),which is an important reaction of synthetic detergent,was studied via different catalysts of aluminum impregnated silica molecular sieves.AlCl_3 was immobilized on silica molecular sieves with different channel structures,hexagonal packing channels network(SBA-15,MCM-41),and disordered channel network(SiO_2,SiO_2-Gel) by impregnation.XRD and N_2 adsorption–desorption isotherms con firmed that the speci fic mesoporous structures were maintained for order channel network catalyst after impregnation.Catalytic activities were investigated under different conditions.The in fluences of channel structure were discussed.The results showed that catalyst based on mesoporous like SBA-15 had the highest catalytic activities and 2-LAB selectivity compared with other catalysts in this work.The highest 2-LAB selectivity was nearly 50% when 1-dodecene conversion was nearly 100%.At low 1-dodecene conversion or higher benzene/1-dodecene molar ratio,2-LAB selectivity was nearly 60%.
基金Supported by Project of National Natural Science Foundation(31501362)Natural Science Foundation Project of Guangxi(2014GXNSFBA118289,2014GXNSFAA118090)
文摘In order to study the effects of seed soaking with Paclobutrazol( PP333) on the tillering and physiological characteristics of sugarcane seedlings,sugar cane variety ROC22 was used as experimental material. The effects of seed soaking with different concentrations of PP333 were studied. The tiller number and growth of sugarcane were surveyed at the 6-leaf stage,the physiological indicators such as chlorophyll content,soluble protein content,proline content and peroxidase activity were measured at the 2-leaf,4-leaf,and 6-leaf stages. The results showed that the seed soaking with PP333 can effectively improve the tillering of sugarcane seedlings. The suitable concentration for the tillering of sugarcane and the growth and development of sugarcane was of 50 mg/L; the seed soaking with PP333 significantly increased the chlorophyll,soluble protein,proline,and peroxidase activity of leaves of sugarcane seedlings; the content of chlorophyll and soluble protein in leaves of sugarcane seedlings treated with 90 mg/L PP333 was the highest,and the proline content and peroxidase activity of sugarcane treated with 50 mg/L PP333 were the highest.
基金This study was supported by Shanghai Municipal Key Clinical Specialty(No.shslczdzk03401).
文摘Objective Fasting capillary blood glucose(CBG)must be measured before fluorodeoxyglucose-positron emission tomography(FDG-PET)imaging.In this study,we aimed to investigate whether a recently measured fasting venous blood glucose(VBG)concentration could be substituted for CBG.Methods This retrospective study included 520 of 1,378 patients who had undergone FDG-PET at our institution in June 2022.None of the study patients had a history of diabetes mellitus.Each study patient’s CBG was measured immediately before FDG administration,whereas the VBG(VBG<7.8 mmol/L)was measured within one week before and after PET imaging.We used Bland−Altman plots to compare the two blood glucose concentrations.Results The 520 participants(315 male,205 female;ages 13-87 years)accounted for 37.7%(520/1378)of all patients.The median CBG and VBG were 5.7 mmol/L(interquartile range,5.2-6.2 mmol/L)and 5.1 mmol/L(interquartile range,4.8-5.8 mmol/L),respectively.There was a moderate positive correlation between CBG and VBG(r=0.4370,95%CI:0.3625-0.5059,P<0.0001).Bland-Altman plots revealed that only 5.8%(30/520)of the dots exceeded the 95%limits of agreement and these were all within acceptable limits,indicating that the bias was not clinically significant.Conclusion When performing FDG-PET on patients without diabetes,a VBG of<7.8 mmol/L within the previous week may be an acceptable alternative to CBG.
