Letters in Applied Microbiology最新文献_第10页

Chemical characterization and evaluation of antiviral activity of two fucoidans extracted from Mediterranean brown seaweeds, Padina pavonica and Dictyopteris membranacea. 地中海褐海带Padina pavonica和Dictyopteris membraneides的翻译结果：

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2025-01-06 DOI: 10.1093/lambio/ovaf002

Safa Amri, Lamjed Bouslama, Zeineb Mzoughi, Fatma Nouira, Hatem Majdoub, Abderrahman Bouraoui

{"title":"Chemical characterization and evaluation of antiviral activity of two fucoidans extracted from Mediterranean brown seaweeds, Padina pavonica and Dictyopteris membranacea.","authors":"Safa Amri, Lamjed Bouslama, Zeineb Mzoughi, Fatma Nouira, Hatem Majdoub, Abderrahman Bouraoui","doi":"10.1093/lambio/ovaf002","DOIUrl":"10.1093/lambio/ovaf002","url":null,"abstract":"Brown seaweeds are known for their bioactive compounds, particularly sulfated polysaccharides such as fucoidans, which have demonstrated antiviral properties. However, limited studies have focused on the antiviral potential of fucoidans extracted from Mediterranean brown seaweeds. In this study, two brown seaweeds Padina pavonica and Dictyopteris membranacea (Fuc-Pad and Fuc-Dic, respectively) were collected from monastir coasts, Tunisia, and a specific extraction protocol was employed to obtain fucoidans. The main objective of this study was to evaluate their antiviral activity against Herpes simplex virus type 2 (HSV-2) and coxsackievirus B3 (CVB-3). Fuc-Pad and Fuc-Dic exhibited potent antiviral activity with high selectivity indexes (>158 780 and 3125 for Fuc-Pad and 6101 and 84 for Fuc-Dic against HSV-2 and CVB-3, respectively). On the other hand, the two brown algae demonstrated different mechanisms of antiviral action according to virus type since they inhibited HSV-2 during the adsorption and penetration stages likely through interaction with cellular receptors that block viral binding while directly inhibiting CVB-3 by blocking specific viral ligands, preventing their attachment to host cell receptors. This antiviral activity seems to be associated with the high degree of sulfating of the fucoidans. These results may suggest the possibility of developing new antiviral drugs.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142950866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to: Antimicrobial potential of Streptomyces sp. NP73 isolated from the forest soil of Northeast India against multi-drug resistant Escherichia coli. 更正：从印度东北部森林土壤中分离的Streptomyces sp. NP73对多重耐药大肠杆菌的抗菌潜力。

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae132

引用次数: 0

Synergy of sodium dodecyl sulfate and citric acid in removing bacterial biofilms in hydroponic farming facilities. 十二烷基硫酸钠和柠檬酸在水培养殖设施中去除细菌生物膜的协同作用。

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae133

Junhan Zhu, Jim Junhui Huang, Cliff Tham, Weibiao Zhou, Dan Li

{"title":"Synergy of sodium dodecyl sulfate and citric acid in removing bacterial biofilms in hydroponic farming facilities.","authors":"Junhan Zhu, Jim Junhui Huang, Cliff Tham, Weibiao Zhou, Dan Li","doi":"10.1093/lambio/ovae133","DOIUrl":"10.1093/lambio/ovae133","url":null,"abstract":"This research explored various concentrations of sodium dodecyl sulfate (SDS) and citric acid (CA), both individually and in combination, to assess their effectiveness against Salmonella biofilms in hydroponic agriculture systems. Results demonstrated that a combined sanitizer of 0.1% SDS (1.0 ± 0.1 log reduction when used alone) and 1% CA (1.4 ± 0.3 log reduction when used alone) was highly effective in eliminating Salmonella biofilms from polyvinyl chloride pipes in hydroponic systems, reducing biofilm levels to below detectable limits (>5.6 log reduction when used in combination). Confocal laser scanning microscopy showed significantly greater proportions of damaged/dead cells in the 0.1% SDS- and 1% CA-treated samples (82.6 ± 2.6%) than in the single treatment with 0.1% SDS (26.1 ± 3.0%) and 1% CA (31.6 ± 2.5%) (P < 0.05). Fourier transform infrared spectroscopy together with analysis of proteins and polysaccharides in the extracellular polymeric substances of the biofilm matrices showed that the treatment not only affected bacterial viability but also significantly reduced the biomass of the biofilm. In summary, this research provides a foundation for the development of improved cleaning protocols in hydroponic systems, promoting safer and more sustainable farming practices.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142864786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combination therapy strategies against multidrug resistant bacteria in vitro and in vivo. 体外和体内多重耐药细菌的联合治疗策略。

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae129

Daliang Wang, Jie Yang, Lilan Yang, Yanglin Du, Qunchao Zhu, Chendong Ma, Dongdong Zhou

{"title":"Combination therapy strategies against multidrug resistant bacteria in vitro and in vivo.","authors":"Daliang Wang, Jie Yang, Lilan Yang, Yanglin Du, Qunchao Zhu, Chendong Ma, Dongdong Zhou","doi":"10.1093/lambio/ovae129","DOIUrl":"10.1093/lambio/ovae129","url":null,"abstract":"Exploring effective combination antibacterial therapies has become a research focus. This study selected seven common antibiotics to perform a series of tests on different Gram-negative bacteria isolated from clinical samples of chronic obstructive pulmonary disease patients. More than 70% of the strains exhibited multidrug resistance but remained sensitive to polymyxin B. The checkerboard assay revealed a significant synergistic effect between polymyxin B and tetracycline against different resistant strains, with fractional inhibitory concentration index values consistently below 0.5. Further time-kill curve analysis demonstrated that the use of minimal inhibit concentration of polymyxin B or tetracycline alone had limited bactericidal effects, while their combination significantly reduced bacterial counts by 2-3 log colony-forming units within 12 h. Additionally, the survival rate of larvae treated with the polymyxin B and tetracycline combination was significantly higher than that of the mono-therapy and untreated groups. In brief, this study demonstrates that the combination of polymyxin B and tetracycline exhibits potent antibacterial activity against multidrug resistant Gram-negative bacteria both in vitro and in vivo.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142824290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cultivar-dependent differences in plant bud microbiome and functional gene pathways in woody plants commonly used in urban green space. 城市绿地常用木本植物植物芽微生物组和功能基因通路的栽培品种依赖性差异。

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae110

Marja I Roslund, Polina Galitskaya, Mika Saarenpää, Aki Sinkkonen

{"title":"Cultivar-dependent differences in plant bud microbiome and functional gene pathways in woody plants commonly used in urban green space.","authors":"Marja I Roslund, Polina Galitskaya, Mika Saarenpää, Aki Sinkkonen","doi":"10.1093/lambio/ovae110","DOIUrl":"10.1093/lambio/ovae110","url":null,"abstract":"Plant richness and microbiota have been associated with plant health; hardly any studies have investigated how plant taxa differs in microbiota in the context of human health. We investigated the microbial differences in buds of 83 woody plant taxa used in urban green spaces in hemiboreal climate, using 16S rRNA and whole metagenome shotgun sequencing. Bud microbial community was the richest in Cotoneaster Nanshan and C. integerrimus, and Malus domestica cultivars \"Sandra\" and \"Lobo\" and poorest in Ribes glandulosum. Metagenomic shotgun sequencing of two M. domestica and four Ribes varieties confirmed differences in taxa in bud microbiota and indicated higher siderophore synthesis in Malus. Microbial richness, including bacteria, archaea, and viruses, and functional richness of gene pathways was higher in Malus compared to Ribes. The 10 most abundant amplicon sequence units, often referred as species, belonged to the phylum Proteobacteria. The differences between plant taxa were evident in classes Alpha- and Gammaproteobacteria, known for potential human health benefits. Since environmental microbiota contributes to human microbiota and immunoregulation, horticultural cultivars hosting rich microbiota may have human health benefits. Further studies are needed to confirm the effectiveness of microbially-oriented plant selection in optimizing human microbiota and planetary health.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142623208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics of heterotrophic endophytic bacteria in four kinds of edible raw vegetables: species distribution, antibiotic resistance, and related genes. 四种可食生蔬菜中异养内生细菌的种类分布、耐药性及相关基因

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae120

Chong-Miao Zhang, Qiao-Qiao Yuan, Yong-Qiang Li, An Liu

{"title":"Characteristics of heterotrophic endophytic bacteria in four kinds of edible raw vegetables: species distribution, antibiotic resistance, and related genes.","authors":"Chong-Miao Zhang, Qiao-Qiao Yuan, Yong-Qiang Li, An Liu","doi":"10.1093/lambio/ovae120","DOIUrl":"10.1093/lambio/ovae120","url":null,"abstract":"This study aimed to explore antibiotic resistance characteristics and species of heterotrophic endophytic bacteria (HEB) in four kinds of edible raw vegetables, including radishes, lettuces, onions, and tomatoes. A total of 144 HEB were isolated and tested for resistance to sulfamethoxazole (SMZ), tetracycline (TET), cefotaxime (CTX), and ciprofloxacin (CIP), and their species were identified by 16S rRNA gene sequencing. Antibiotic resistance genes (ARGs) and class I integron in antibiotic-resistant isolates were analyzed by polymerase chain reaction. The results showed radishes had the highest, while tomatoes had the lowest concentration of antibiotic-resistant HEB. SMZ and CTX were predominant antibiotic-resistant phenotypes in HEB. The multi-resistant phenotypes, the combinations SMZ-TET-CTX and SMZ-TET-CIP, accounted for 9.34% of all antibiotic-resistant phenotypes, mainly in radishes and lettuces. Bacillus, Pseudomonas, Staphylococcus, and Stenotrophomonas showed resistance to two antibiotics and existed in more than one kind of vegetable, and were the main carriers of sul1, sul2, blaTEM, and intI1 genes. Therefore, these four genera were considered potential hosts of ARGs in edible raw vegetables. The study provides an early warning regarding health risks associated with ingesting antibiotic-resistant bacteria through raw vegetable consumption.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142751111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulation of physiological functions and metabolome of Vibrio alginolyticus by quorum-regulatory sRNA, Qrr1. 群体调节sRNA （Qrr1）对溶藻弧菌生理功能和代谢组的调节

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae126

Yanni Zhao, Ruobing Wu, Xuan Wu, Ningning Zhou, Jiamin Ren, Wang Liu, Rui Yu, Senhu Zhang, Jinfang Yang, Hua Li, Huan Liu

{"title":"Modulation of physiological functions and metabolome of Vibrio alginolyticus by quorum-regulatory sRNA, Qrr1.","authors":"Yanni Zhao, Ruobing Wu, Xuan Wu, Ningning Zhou, Jiamin Ren, Wang Liu, Rui Yu, Senhu Zhang, Jinfang Yang, Hua Li, Huan Liu","doi":"10.1093/lambio/ovae126","DOIUrl":"10.1093/lambio/ovae126","url":null,"abstract":"Vibrio alginolyticus, the causative agent of aquatic vertebrates and invertebrates, can cause severe infections (e.g. septicemia, gill necrosis, and surface ulcers) and high mortality in aquatic organisms, leading to serious economic losses in global aquaculture. Small non-coding RNAs (sRNAs), emerging modulators of gene expression, played vital regulatory roles in virulence, pathogenicity, and physiological metabolism of bacteria. In this work, the modulation of physiological functions and metabolome of V. alginolyticus by the quorum-regulatory sRNA, Qrr1, was figured out. We found that the deletion of qrr1 induced significant cell shape elongation. Meanwhile, Qrr1 could inhibit the production of alkaline serine protease by weakening the expression of main regulator LuxR in the quorum sensing (QS) system. Moreover, the untargeted metabolomics and lipidomics approaches showed that most of nucleotides, organic acids, carbohydrates, and lipidome (both lipid content and category) were significantly altered in response to the qrr1 deletion. Spearman correlation analysis demonstrated that most of the intermediates involved in glutamate metabolism, sphingolipid metabolism, and glycerolipid metabolism displayed high correlations with cell virulence factors. These findings illuminate the mechanism of bacterial virulence regulation and further exploit potential therapeutic targets for virulence prevention in V. alginolyticus.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142807126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioremediation of polyaromatic hydrocarbon polluted sewage sludge soil employing a bacterial consortium and phytotoxicity evaluation. 利用细菌联合体对受多芳烃污染的污水污泥土壤进行生物修复和植物毒性评估。

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae130

Gulfishan Khan, Anshul Tiwari, Devendra K Patel, Sadasivam Anbumani, Natesan Manickam

{"title":"Bioremediation of polyaromatic hydrocarbon polluted sewage sludge soil employing a bacterial consortium and phytotoxicity evaluation.","authors":"Gulfishan Khan, Anshul Tiwari, Devendra K Patel, Sadasivam Anbumani, Natesan Manickam","doi":"10.1093/lambio/ovae130","DOIUrl":"10.1093/lambio/ovae130","url":null,"abstract":"A consortium of five distinct bacterial strains was evaluated for their ability to biodegrade multiple polyaromatic hydrocarbons (PAHs) in sewage sludge under microcosm studies. The presence of PAHs was determined from the sludge samples collected during pre- and post-monsoon seasons from three different wastewater treatment plants (WWTPs). Among the 16 PAHs found, the lowest concentration detected was 1.75 ng g-1 of benz(k)fluoranthene, and the highest concentration of 5.41 mg g-1 indeno(1,2,3-cd) pyrene was found in both dry and wet samples, perhaps owing to its multiple origin of contamination. A bacterial consortium comprising of well characterized bacteria Stenotrophomonas maltophilia IITR87, Ochrobactrum anthropi IITR07, Microbacterium esteraromaticum IITR47, Pseudomonas aeruginosa IITR48, and Pseudomonas mendocina IITR46 employed for PAHs bioremediation in a microcosm study. In 20 days, 65%-70% of PAHs were remediated, and low molecular weight PAHs such as naphthalene, phenanthrene, and pyrene showed enhanced degradation. Bioremediated samples showed a significant reduction in phytotoxicity using plant germination of wheat (Triticum aestivum), black chickpea (Cicer arietinum), and mustard (Brassica juncea), whereas the contaminated soil showed severe inhibition of plant growth. The results comprehensively suggest a possible remediation option for PAHs occurring in complex sewage sludge, preventing further contamination into other environmental compartments.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142818546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to: Conserved CRISPR arrays in Salmonella enterica serovar Infantis can serve as qPCR targets to detect Infantis in mixed serovar populations. 修正：肠炎沙门氏菌血清型婴儿中保守的CRISPR序列可作为混合血清型人群中检测婴儿的qPCR靶点。

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae131

引用次数: 0

Re-sensitization of imipenem-resistant Pseudomonas aeruginosa and restoration of cephalosporins susceptibility in Enterobacteriaceae by recombinant Esterase B. 重组酯酶 B 对耐亚胺培南铜绿假单胞菌的再敏感性和肠杆菌科细菌对头孢菌素的敏感性的恢复。

IF 2 4区生物学

Letters in Applied Microbiology Pub Date : 2024-12-02 DOI: 10.1093/lambio/ovae118

Wirongrong Whangsuk, Punyawee Dulyayangkul, Suvit Loprasert, James M Dubbs, Paiboon Vattanaviboon, Skorn Mongkolsuk

{"title":"Re-sensitization of imipenem-resistant Pseudomonas aeruginosa and restoration of cephalosporins susceptibility in Enterobacteriaceae by recombinant Esterase B.","authors":"Wirongrong Whangsuk, Punyawee Dulyayangkul, Suvit Loprasert, James M Dubbs, Paiboon Vattanaviboon, Skorn Mongkolsuk","doi":"10.1093/lambio/ovae118","DOIUrl":"10.1093/lambio/ovae118","url":null,"abstract":"Sphingobium sp. SM42 Esterase B (EstB) is an enzyme with a dual function in degrading dibutyl phthalate and catalyzing the cleavage of the C-S bond in C3-sidechains of the dihydrothiazine ring of cephalosporins, generating more active β-lactam derivatives. Global prokaryotic genome analysis revealed the existence of a gene identical to estB in Pseudomonas aeruginosa strain PS1 suggesting a horizontal gene transfer event involving estB. To investigate the effect of ectopic expression of EstB in the periplasm of P. aeruginosa and several Enterobacteriaceae on antibiotic susceptibility levels, plasmid, pEstB, carrying a recombinant EstB fused with the signal peptide from Escherichia coli outer membrane protein A (OmpA) for periplasmic localization was constructed. The expression of EstB in the periplasm of P. aeruginosa and the Enterobacteriaceae: E. coli, Klebsiella pneumoniae, and Salmonella enterica serovar Typhi, increased susceptibility to carbapenems and cephalosporins. EstB reversed the imipenem resistance of P. aeruginosa ΔmexS and restored the changes in susceptibility to cephalosporins conferred by the downregulation of the outer membrane proteins, OmpK35 and OmpK36, in K. pneumoniae ΔramR-ompK36 to wild-type level. The introduction of EstB to the periplasmic space of Gram-negative bacteria can increase carbapenem and cephalosporin susceptibility.","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142693206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0