Three strains of Gram-negative bacteria capable of removing geosmin from drinking water were isolated from biologically active carbon and identified to be Chryseobacterium sp., Sinorhizobium sp. and Stenotrophomonas s...Three strains of Gram-negative bacteria capable of removing geosmin from drinking water were isolated from biologically active carbon and identified to be Chryseobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp. based on physio-biochemistry analysis and 16S rRNA gene sequence analysis. Removal efficiencies of 2 mg/L geosmin in mineral salts medium were 84.0%, 80.2% and 74.4% for Chryxeobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp., respectively, while removal efficiencies of 560 ng/L geosmin in filter influent were 84.8%, 82.3% and 82.5%, respectively. The biodegradation of geosmin was determined to be a pseudo first-order reaction, with rate constants at 2 mg/L and 560 ng/L being 0.097 and 0.086 day-1, 0.089 and 0.084 day-1, 0.074 and 0.098 day-1 for the above mentioned degraders, respectively. The biomass of culture in the presence of geosmin was much higher than that in the absence of geosmin.展开更多
One of the most common taste and odour compounds （TOCs） in drinking water is 2-methylisobor- neol （2-MIB） which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MI...One of the most common taste and odour compounds （TOCs） in drinking water is 2-methylisobor- neol （2-MIB） which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MIB were isolated from the surface of a biological activated carbon filter, and were characterized as Micrococcus spp., Flavobacterium spp., Brevibacterium spp. and Pseudomonas spp. based on 16S rRNA analysis. The removal efficiencies of 2-MIB with initial concentra- tions of 515 ng.L i were 98.4%, 96.3%, 95.0%, and 92.8% for Micrococcus spp., Flavobacterium spp., Brevibacter- ium spp. and Pseudomonas spp., respectively. These removal efficiencies were slightly higher than those with initial concentration at 4.2 mg. L~ （86.1%, 84.4%, 86.7% and 86.0%, respectively）. The kinetic model showed that biodegradation of 2-MIB at an initial dose of 4.2 mg. L1 was a pseudo-first-order reaction, with rate constants of 0.287, 0.277, 0.281, and 0.294d-1, respectively. These degraders decomposed 2-MIB to form 2-methylenebor- nane and 2-methyl-2-bornane as the products.展开更多
目的总结心室辅助装置治疗儿童心肌病晚期心力衰竭初步临床管理经验。方法收集2023年2月至2024年2月在浙江大学医学院附属儿童医院行植入Corheart 6左心室辅助装置+三尖瓣环缩术的3例心肌病晚期心力衰竭患儿的临床资料,其中男1例,女2例...目的总结心室辅助装置治疗儿童心肌病晚期心力衰竭初步临床管理经验。方法收集2023年2月至2024年2月在浙江大学医学院附属儿童医院行植入Corheart 6左心室辅助装置+三尖瓣环缩术的3例心肌病晚期心力衰竭患儿的临床资料,其中男1例,女2例;年龄12~14岁;体重30.0~38.0 kg。患儿心功能按照纽约心脏协会分级(New York Heart Association,NYHA)标准以及机械辅助循环支持机构间登记(Interagency Registry for Mechanically Assisted Circulatory Support,INTERMACS)标准进行分级;依照美国心脏病学院分期(American College of Cardiology,ACC)标准分期,术后出院随访,生活质量采用堪萨斯城心肌病问卷(Kansas city cardiomyopathy questionnaire,KCCQ)进行评分。结果例1为心内膜弹力纤维增生症+左心室部分心肌致密化不全,心功能NYHA Ⅳ级,INTERMACS Ⅲ级,ACC分期为D期;例2和例3为扩张型心肌病,心功能NYHAⅣ级,INTERMACS分别为Ⅲ级和Ⅱ级,ACC分期均为D期。3例患儿均顺利完成手术并出院,术后随访4个月至1年,体能明显增加,未发生重大并发症。KCCQ评分由术前6.5~35分提高到88~92分。3例患儿均未发生伤口感染,其中2例术后半年左右复学,1例在家休养。结论植入式左心室辅助装置应用于心肌病晚期心力衰竭患儿,可明显改善生存质量。展开更多
基金supported by the National Science and Technology Major Projects Special for Water Pollution Control and Management (No. 2009ZX07424-003)
文摘Three strains of Gram-negative bacteria capable of removing geosmin from drinking water were isolated from biologically active carbon and identified to be Chryseobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp. based on physio-biochemistry analysis and 16S rRNA gene sequence analysis. Removal efficiencies of 2 mg/L geosmin in mineral salts medium were 84.0%, 80.2% and 74.4% for Chryxeobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp., respectively, while removal efficiencies of 560 ng/L geosmin in filter influent were 84.8%, 82.3% and 82.5%, respectively. The biodegradation of geosmin was determined to be a pseudo first-order reaction, with rate constants at 2 mg/L and 560 ng/L being 0.097 and 0.086 day-1, 0.089 and 0.084 day-1, 0.074 and 0.098 day-1 for the above mentioned degraders, respectively. The biomass of culture in the presence of geosmin was much higher than that in the absence of geosmin.
文摘One of the most common taste and odour compounds （TOCs） in drinking water is 2-methylisobor- neol （2-MIB） which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MIB were isolated from the surface of a biological activated carbon filter, and were characterized as Micrococcus spp., Flavobacterium spp., Brevibacterium spp. and Pseudomonas spp. based on 16S rRNA analysis. The removal efficiencies of 2-MIB with initial concentra- tions of 515 ng.L i were 98.4%, 96.3%, 95.0%, and 92.8% for Micrococcus spp., Flavobacterium spp., Brevibacter- ium spp. and Pseudomonas spp., respectively. These removal efficiencies were slightly higher than those with initial concentration at 4.2 mg. L~ （86.1%, 84.4%, 86.7% and 86.0%, respectively）. The kinetic model showed that biodegradation of 2-MIB at an initial dose of 4.2 mg. L1 was a pseudo-first-order reaction, with rate constants of 0.287, 0.277, 0.281, and 0.294d-1, respectively. These degraders decomposed 2-MIB to form 2-methylenebor- nane and 2-methyl-2-bornane as the products.
文摘目的总结心室辅助装置治疗儿童心肌病晚期心力衰竭初步临床管理经验。方法收集2023年2月至2024年2月在浙江大学医学院附属儿童医院行植入Corheart 6左心室辅助装置+三尖瓣环缩术的3例心肌病晚期心力衰竭患儿的临床资料,其中男1例,女2例;年龄12~14岁;体重30.0~38.0 kg。患儿心功能按照纽约心脏协会分级(New York Heart Association,NYHA)标准以及机械辅助循环支持机构间登记(Interagency Registry for Mechanically Assisted Circulatory Support,INTERMACS)标准进行分级;依照美国心脏病学院分期(American College of Cardiology,ACC)标准分期,术后出院随访,生活质量采用堪萨斯城心肌病问卷(Kansas city cardiomyopathy questionnaire,KCCQ)进行评分。结果例1为心内膜弹力纤维增生症+左心室部分心肌致密化不全,心功能NYHA Ⅳ级,INTERMACS Ⅲ级,ACC分期为D期;例2和例3为扩张型心肌病,心功能NYHAⅣ级,INTERMACS分别为Ⅲ级和Ⅱ级,ACC分期均为D期。3例患儿均顺利完成手术并出院,术后随访4个月至1年,体能明显增加,未发生重大并发症。KCCQ评分由术前6.5~35分提高到88~92分。3例患儿均未发生伤口感染,其中2例术后半年左右复学,1例在家休养。结论植入式左心室辅助装置应用于心肌病晚期心力衰竭患儿,可明显改善生存质量。
