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
Objective:To investigate the clinical and epidemiological features and outcome of Chryseobacterium and Elizabethkingia spp.infections in children,together with antimicrobial susceptibilities.Methods:This retrospective...Objective:To investigate the clinical and epidemiological features and outcome of Chryseobacterium and Elizabethkingia spp.infections in children,together with antimicrobial susceptibilities.Methods:This retrospective study was conducted at a tertiary pediatric hospital in Turkey.All patients infected with Chryseobacterium/Elizabethkingia spp.among those presenting to Ankara City Hospital between March 2014 and March 2022 were included.Results:A total of 49 cases were included and 29 cases were identified as Elizabethkingia.The median age was 14(0.2-185.0)months.The majority(89.8%)of these patients had an underlying disease,including malignancy(42.9%).Bacteremia(46.9%)and central line-associated bloodstream infection(28.6%)were the most common infections.The thirty-day all-cause mortality rate was 12.2%.The most commonly used antibiotics were ciprofloxacin and trimethoprim-sulfamethoxazole(TMP-SMX).Forty-five(91.8%)isolates were susceptible to ciprofloxacin,44(91.6%)to TMP-SMX,and 21(87.5%)to levofloxacin.Conclusions:Chryseobacterium and Elizabethkingia spp.are emergent,nosocomial pathogens and the majority of cases were older than the neonatal period.They were mainly seen in patients with long hospital stays,indwelling devices,and those who have received antibiotics within the last month,especially carbapenems.In addition,they were associated with bloodstream infection and malignancy.The most commonly useful antibiotics according to the resistance patterns were ciprofloxacin and TMP-SMX.展开更多
Purpose: Since Chryseobacterium indologenes (C. indologenes) is a rare human pathogen, its clinical significance has not yet been fully established. C. indologenes contamination of medical devices involving fluids and...Purpose: Since Chryseobacterium indologenes (C. indologenes) is a rare human pathogen, its clinical significance has not yet been fully established. C. indologenes contamination of medical devices involving fluids and of surgical implants has led to an increasing number of serious infectious reported in recent years, mainly in patients in extremes ages and an immunocompromised state. In this study, we describe the clinical and microbiological characteristics of seven adult patients with C. indologenes bacteremia treated in a tertiary medical center in Israel over a six-year period. Methods: Adult patients hospitalized in Rabin Medical Center, Israel, with a blood culture positive for C. indologenes during the period 2009-2014 were identified retrospectively and their medical records were reviewed. Results: Seven episodes of C. indologenes bacteremia in seven patients were identified during the study period. Five patients were females;the mean age was 76.8 years (41 - 92). Serious underlying conditions were present in all patients. All patients but one, presented after a recent invasive healthcare related intervention. Two patients required mechanical ventilation. Two patients died. All but one isolates were susceptible to ciprofloxacin. Conclusions: Despite our limited number of cases, to the best of our knowledge, our study serves as the largest cohort of adult patients with C. indologenes bacteremia reported in recent years.展开更多
[Objective] The aim was to explore the relationship between alage-lysing bacterium and Anabaena flosaquae so as to provide reference for the control of bloom. [Method] An algae-lysing bacterium strain named S7 was iso...[Objective] The aim was to explore the relationship between alage-lysing bacterium and Anabaena flosaquae so as to provide reference for the control of bloom. [Method] An algae-lysing bacterium strain named S7 was isolated from eu- trophic river. The lyric efficiency and performing mode of S7 strain to Anabaena flos- aquae was studied. Influence of different environmental factors and the relationship between S7 strain and Anabaena flosaquae was also studied, and then the bacteri- um strain was physiologically identified. [Result] More than 90% of Anabaena flos- aquae had been removed by 7 d when the volume ratio of medium to algae solu- tion was 30%, the pH was 9 and the temperature was 35 ℃. These results also showed that a mutual inhibit relationship existed between S7 strain and Anabaena flos-aquae. The S7 strain killed the algae by indirectly through certain lyric agents in absence of direct contact with the target but by secreting metabolites. Moreover, these lyric agents also had the thermostability. 16SrDNA sequence analysis showed that S7 strain belonged to Chryseobacterium sp. [Conclusion] The examined Poly-p proved that S7 strain is polyphosphate accumulating bacteria （PAOs） and has better lyric efficiency.展开更多
A Gram-negative, aerobic, non-motile, rod-shaped bacterial strain, designated 25-1T, was isolated from the air inside giant panda enclosures at the Chengdu Research Base of Giant Panda Breeding, China. Strain 25-1T gr...A Gram-negative, aerobic, non-motile, rod-shaped bacterial strain, designated 25-1T, was isolated from the air inside giant panda enclosures at the Chengdu Research Base of Giant Panda Breeding, China. Strain 25-1T grew optimally at pH 7.0-8.0, at 28-30 ℃ and in the presence of NaCI concentrations from 0.0% to 0.5%. 16S rRNA gene sequence analysis indicated that strain 25-1m belongs to the genus Chryseobacterium within the family Flavo- bacteriaceae and is related most closely to C. camis G81m （96.4% similarity）, C. lathyri RBA2-6T （95.8% similarity）, and C. zeae JM1085T （95.8% similarity）. Its genomic DNA G＋C molar composition was 36.2%. The major cellular fatty acids were iso-C15：0 （44.0%）, iso-C17：0 3OH （19.8%） and C16：1 ω7c/16：1 ω6c （12.7%）. The only isoprenoid quinone was menaquinone 6 （MK-6）. The major polar lipids were phosphatidylethanolamine, two unidentified amino lipids and two unidentified lipids. The DNA-DNA relatedness between strain 25-1m and C. lathyri RBA2-6T was 38%. Phenotypic, genotypic, and phylogenetic characteristics indicated that strain 25-1T is a novel member of the genus Chryseobacterium, for which the name C. chengduensis sp. nov. is proposed. The type strain is 25-1T （ccmoc AB2015133T=DSM 100396T）.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Objective:To investigate the clinical and epidemiological features and outcome of Chryseobacterium and Elizabethkingia spp.infections in children,together with antimicrobial susceptibilities.Methods:This retrospective study was conducted at a tertiary pediatric hospital in Turkey.All patients infected with Chryseobacterium/Elizabethkingia spp.among those presenting to Ankara City Hospital between March 2014 and March 2022 were included.Results:A total of 49 cases were included and 29 cases were identified as Elizabethkingia.The median age was 14(0.2-185.0)months.The majority(89.8%)of these patients had an underlying disease,including malignancy(42.9%).Bacteremia(46.9%)and central line-associated bloodstream infection(28.6%)were the most common infections.The thirty-day all-cause mortality rate was 12.2%.The most commonly used antibiotics were ciprofloxacin and trimethoprim-sulfamethoxazole(TMP-SMX).Forty-five(91.8%)isolates were susceptible to ciprofloxacin,44(91.6%)to TMP-SMX,and 21(87.5%)to levofloxacin.Conclusions:Chryseobacterium and Elizabethkingia spp.are emergent,nosocomial pathogens and the majority of cases were older than the neonatal period.They were mainly seen in patients with long hospital stays,indwelling devices,and those who have received antibiotics within the last month,especially carbapenems.In addition,they were associated with bloodstream infection and malignancy.The most commonly useful antibiotics according to the resistance patterns were ciprofloxacin and TMP-SMX.
文摘Purpose: Since Chryseobacterium indologenes (C. indologenes) is a rare human pathogen, its clinical significance has not yet been fully established. C. indologenes contamination of medical devices involving fluids and of surgical implants has led to an increasing number of serious infectious reported in recent years, mainly in patients in extremes ages and an immunocompromised state. In this study, we describe the clinical and microbiological characteristics of seven adult patients with C. indologenes bacteremia treated in a tertiary medical center in Israel over a six-year period. Methods: Adult patients hospitalized in Rabin Medical Center, Israel, with a blood culture positive for C. indologenes during the period 2009-2014 were identified retrospectively and their medical records were reviewed. Results: Seven episodes of C. indologenes bacteremia in seven patients were identified during the study period. Five patients were females;the mean age was 76.8 years (41 - 92). Serious underlying conditions were present in all patients. All patients but one, presented after a recent invasive healthcare related intervention. Two patients required mechanical ventilation. Two patients died. All but one isolates were susceptible to ciprofloxacin. Conclusions: Despite our limited number of cases, to the best of our knowledge, our study serves as the largest cohort of adult patients with C. indologenes bacteremia reported in recent years.
基金Supported by Ecological Environment Construction and Protection Demonstration Project of Three Gorges~~
文摘[Objective] The aim was to explore the relationship between alage-lysing bacterium and Anabaena flosaquae so as to provide reference for the control of bloom. [Method] An algae-lysing bacterium strain named S7 was isolated from eu- trophic river. The lyric efficiency and performing mode of S7 strain to Anabaena flos- aquae was studied. Influence of different environmental factors and the relationship between S7 strain and Anabaena flosaquae was also studied, and then the bacteri- um strain was physiologically identified. [Result] More than 90% of Anabaena flos- aquae had been removed by 7 d when the volume ratio of medium to algae solu- tion was 30%, the pH was 9 and the temperature was 35 ℃. These results also showed that a mutual inhibit relationship existed between S7 strain and Anabaena flos-aquae. The S7 strain killed the algae by indirectly through certain lyric agents in absence of direct contact with the target but by secreting metabolites. Moreover, these lyric agents also had the thermostability. 16SrDNA sequence analysis showed that S7 strain belonged to Chryseobacterium sp. [Conclusion] The examined Poly-p proved that S7 strain is polyphosphate accumulating bacteria （PAOs） and has better lyric efficiency.
基金supported by the Chengdu Giant Panda Breeding Research Foundation(No.CPF2010-06)the National Key Technology R&D Program of China(No.2012BAC01B06)
文摘A Gram-negative, aerobic, non-motile, rod-shaped bacterial strain, designated 25-1T, was isolated from the air inside giant panda enclosures at the Chengdu Research Base of Giant Panda Breeding, China. Strain 25-1T grew optimally at pH 7.0-8.0, at 28-30 ℃ and in the presence of NaCI concentrations from 0.0% to 0.5%. 16S rRNA gene sequence analysis indicated that strain 25-1m belongs to the genus Chryseobacterium within the family Flavo- bacteriaceae and is related most closely to C. camis G81m （96.4% similarity）, C. lathyri RBA2-6T （95.8% similarity）, and C. zeae JM1085T （95.8% similarity）. Its genomic DNA G＋C molar composition was 36.2%. The major cellular fatty acids were iso-C15：0 （44.0%）, iso-C17：0 3OH （19.8%） and C16：1 ω7c/16：1 ω6c （12.7%）. The only isoprenoid quinone was menaquinone 6 （MK-6）. The major polar lipids were phosphatidylethanolamine, two unidentified amino lipids and two unidentified lipids. The DNA-DNA relatedness between strain 25-1m and C. lathyri RBA2-6T was 38%. Phenotypic, genotypic, and phylogenetic characteristics indicated that strain 25-1T is a novel member of the genus Chryseobacterium, for which the name C. chengduensis sp. nov. is proposed. The type strain is 25-1T （ccmoc AB2015133T=DSM 100396T）.
