Polish Journal of Microbiology最新文献

{"title":"Molecular Characterization of <i>Aspergillus flavus</i> Strains Isolated from Animal Feeds.","authors":"Hadjer Saber,&nbsp;Yahia Chebloune,&nbsp;Abdallah Moussaoui","doi":"10.33073/pjm-2022-048","DOIUrl":"https://doi.org/10.33073/pjm-2022-048","url":null,"abstract":"<p><p>Aflatoxin (AF)-producing fungi such as <i>Aspergillus flavus</i> commonly contaminate animal feeds, causing high economic losses. <i>A. flavus</i> is the most prevalent and produces AFB1, a potent mutagen, and carcinogen threatening human and animal health. <i>Aspergillaceae</i> is a large group of closely related fungi sharing number of morphological and genetic similarities that complicate the diagnosis of highly pathogenic strains. We used here morphological and molecular assays to characterize fungal isolates from animal feeds in Southwestern Algeria. These tools helped to identify 20 out of 30 <i>Aspergillus</i> strains, and 15 of them belonged to the <i>Aspergillus</i> section <i>Flavi</i>. Further analyses detected four out of 15 as belonging to <i>Aspergillus flavus-parasiticus</i> group. PCR targeting the AF genes' <i>aflR-aflS(J)</i> intergenic region amplified a single 674 bp amplicon in all four isolates. The amplicons were digested with a <i>Bgl</i>II endonuclease, and three specific fragments were observed for <i>A. flavus</i> but <i>A. parasitucus</i> lacked two typical fragments. Sequencing data of four amplicons confirmed the presence of the two <i>Bgl</i>II restriction sites yielding the three fragments, confirming that all four strains were <i>A. flavus</i>. In addition, this analysis illustrated the genetic variability within the <i>A. flavus</i> strains.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/99/c7/pjm-71-589.PMC9944975.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9310343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation, Identification, and Fermentation Medium Optimization of a Caproic Acid‑Producing <i>Enterococcus casseliflavus</i> Strain from Pit Mud of Chinese Strong Flavor Baijiu Ecosystem.","authors":"Hao Luo,&nbsp;Tao Li,&nbsp;Jia Zheng,&nbsp;Kaizheng Zhang,&nbsp;Zongwei Qiao,&nbsp;Huibo Luo,&nbsp;Wei Zou","doi":"10.33073/pjm-2022-052","DOIUrl":"https://doi.org/10.33073/pjm-2022-052","url":null,"abstract":"<p><p>Caproic acid is the precursor material of ethyl hexanoate, a representative flavor substance in strong flavor baijiu (SFB). Increasing the content of caproic acid in SFB helps to improve its quality. In the present study, caproic acid-producing bacteria from the pit mud of an SFB ecosystem were isolated, purified, and characterized. Strain BF-1 with the highest caproic acid yield (0.88 g/l) was selected. The morphological and molecular identification analysis showed that strain BF-1 was <i>Enterococcus casseliflavus</i>. The genome of <i>E. casseliflavus</i> BF-1 was sequenced and was found to be 2,968,377 bp in length with 3,270 open reading frames (ORFs). The caproic acid biosynthesis pathway in <i>E. casseliflavus</i> BF-1 was predicted based on the KAAS annotation. The virulence factors in the genome of strain BF-1 were annotated, which showed that <i>E. casseliflavus</i> BF-1 is safe at the genetic level. After adding essential nutrients based on the KAAS annotation, the optimum medium conditions for acid production by strain BF-1 were obtained by performing orthogonal experiments. The caproic acid yield of strain BF-1 reached 3.03 g/l, which was 3.44-fold higher than the initial yield. The optimized fer- mentation of caproic acid production by BF-1 was reported for the first time. The strain could be further used to regulate the ecosystem in baijiu production to improve its quality.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/7f/de/pjm-71-563.PMC9944964.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9310345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retrospective Analysis of the <i>Ureaplasma</i> spp. Prevalence with Reference to Other Genital Tract Infections in Women of Reproductive Age.","authors":"Katarzyna Rak,&nbsp;Aneta Kiecka,&nbsp;Joanna Białecka,&nbsp;Anna Kawalec,&nbsp;Paweł Krzyściak,&nbsp;Anna Białecka","doi":"10.33073/pjm-2022-044","DOIUrl":"https://doi.org/10.33073/pjm-2022-044","url":null,"abstract":"<p><p><i>Ureaplasma</i> spp. are frequently isolated from the genital tract of women of reproductive age. To date, it remains unclear whether they are commensal or pathogenic. In our study, we assessed the prevalence of <i>Ureaplasma</i> spp. in a group of 1,155 women of childbearing age. In addition, we assessed how often women with positive <i>Ureaplasma</i> spp. develop genital tract co-infections and how the vaginal pH changes. This study showed a relationship between colonization by <i>Ureaplasma</i> spp. and presenting symptoms. In fact, we showed that colonization of the genital tract by <i>Ureaplasma</i> spp. can affect the occurrence of co-infections such as <i>Gardnerella vaginalis</i>. We also observed a relationship between increased pH values and the presence of <i>Ureaplasma</i> spp.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/05/f9/pjm-71-509.PMC9944971.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10760511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"<i>In Vivo</i> Efficacy of <i>Bacillus velezensis</i> Isolated from Korean Gochang Bokbunja Vinegar against Carbapenem-Resistant <i>Klebsiella pneumoniae</i> Infections.","authors":"Fatemeh Ghorbanian,&nbsp;Hoonhee Seo,&nbsp;Hanieh Tajdozian,&nbsp;Youngkyoung Lee,&nbsp;Md Abdur Rahim,&nbsp;Sukyung Kim,&nbsp;Il-Yun Jung,&nbsp;Saebim Lee,&nbsp;Ho-Yeon Song","doi":"10.33073/pjm-2022-051","DOIUrl":"https://doi.org/10.33073/pjm-2022-051","url":null,"abstract":"<p><p>Outbreaks of carbapenem-resistant <i>Enterobacteriaceae</i> (CRE), especially <i>Klebsiella pneumoniae</i> (CRKP), are commonly reported as severe infections in hospitals and long-term care settings, and their occurrence is increasing globally. Conventional antibiotics used for treating CRE have become ineffective due to resistance development. Furthermore, their safety issues restrict their availability and use for CRE treatment. Therefore, developing new drugs different from existing drugs to combat this deadly menace is urgently needed. Probiotics can be a potential option in this context, as probiotics' efficacy against a variety of infectious illnesses has already been well established. Here, we report the effect of the <i>Bacillus velezensis</i> strain isolated from Gochang Bokbunja vinegar in Korea on CRE infection using two mouse models. Data showed that pretreatment with <i>B. velezensis</i> significantly reduced body weight loss and mortality of CRKP-infected mice in the preventive model. The oral administration of <i>B. velezensis</i> in a therapeutic model also decreased the mortality and illness severity in CRKP-infected mice. Moreover, a two-week oral acute toxicity assay in guinea pigs did not reveal any aberrant clinical signs. Our findings demonstrate the potential effectiveness of our candidate probiotic strain, <i>B. velezensis</i>, against CRKP, suggesting that it could be used as an antimicrobial agent for treating CRKP-related infections.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/c2/6e/pjm-71-553.PMC9944968.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9309848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid and Simple Approaches for Diagnosis of <i>Staphylococcus aureus</i> in Bloodstream Infections.","authors":"Rui Duan,&nbsp;Pei Wang","doi":"10.33073/pjm-2022-050","DOIUrl":"https://doi.org/10.33073/pjm-2022-050","url":null,"abstract":"<p><p><i>Staphylococcus aureus</i> is an important causative pathogen of bloodstream infections. An amplification assay such as real-time PCR is a sensitive, specific technique to detect <i>S. aureus</i>. However, it needs well-trained personnel, and costs are high. A literature review focusing on rapid and simple methods for diagnosing <i>S. aureus</i> was performed. The following methods were included: (a) Hybrisep <i>in situ</i> hybridization test, (b) T2Dx system, (c) BinaxNow <i>Staphylococcus aureus</i> and PBP2a, (d) Gram staining, (e) PNA FISH and QuickFISH, (f) Accelerate Pheno^TM system, (g) MALDI-TOF MS, (h) BioFire FilmArray, (i) Xpert MRSA/SA. These rapid and simple methods can rapidly identify <i>S. aureus</i> in positive blood cultures or direct blood samples. Furthermore, BioFire FilmArray and Xpert MRSA/SA identify methicillin-resistant <i>S. aureus</i> (MRSA), and the Accelerate Pheno^TM system can also provide antimicrobial susceptibility testing (AST) results. The rapidity and simplicity of results generated by these methods have the potential to improve patient outcomes and aid in the prevention of the emergence and transmission of MRSA.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/5f/c6/pjm-71-481.PMC9944965.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10819486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production and Quantification of Virulence Factors in <i>Malassezia</i> Species.","authors":"Inès Hadrich,&nbsp;Nahed Khemekhem,&nbsp;Sourour Neji,&nbsp;Houaida Trablesi,&nbsp;Amin Ilahi,&nbsp;Hayet Sellami,&nbsp;Fattouma Makni,&nbsp;Ali Ayadi","doi":"10.33073/pjm-2022-047","DOIUrl":"https://doi.org/10.33073/pjm-2022-047","url":null,"abstract":"<p><p>Seventy-seven strains of <i>Malassezia</i> were included in this study. Biofilm and hydrolytic enzyme production were studied by using specific solid media. The Real-Time reverse transcriptase qPCR method was applied to determine the overexpression of genes encoding the extracellular enzymes. All included <i>Malassezia</i> species produced biofilms. No statistically significant difference was observed between <i>Malassezia</i> species in biofilm formation (<i>p</i> = 0.567). All <i>Malassezia</i> species produced lipase, and 95% of <i>Malassezia globosa</i> showed a strong enzymatic activity (Pz = 0.55 ± 0.02). A statistically significant difference was observed between the mean keratinase indices of <i>Malassezia slooffiae</i> and the other <i>Malassezia</i> species (<i>p</i> = 0.005). The overexpression of one or more genes was observed in 100% of strains isolated from patients with folliculitis, 87.5% - with pityriasis versicolor, and 57.14% of the control group isolates. A statistically significant difference in the lipase gene expression (<i>p</i> = 0.042) was between the strains from patients with folliculitis and the control group. This investigation provides more information about the frequency of the production of the major enzymes considered virulence factors of <i>Malassezia</i> species. Interestingly, the overexpression of one or more genes was observed in strains isolated from patients with <i>Malassezia</i> disorders.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/f9/b8/pjm-71-529.PMC9944974.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9309828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of MicroRNA-Like RNAs in the Regulation of Spore Morphological Differences in the Entomopathogenic Fungus <i>Metarhizium acridum</i>.","authors":"Erhao Zhang,&nbsp;Jie Zhang,&nbsp;Rundong Zhao,&nbsp;Yazhou Lu,&nbsp;Xiu Yin,&nbsp;Xiaozhong Lan,&nbsp;Zhang Luo","doi":"10.33073/pjm-2022-028","DOIUrl":"https://doi.org/10.33073/pjm-2022-028","url":null,"abstract":"<p><p><i>Metarhizium acridum</i> is an important microbial pesticide. Conidia (CO) and blastospores (BS) are two types of spores that occur in different patterns in the <i>M. acridum</i> life cycle and exhibit significant differences in cell morphology, structure, and activity. It may suggest that the fungus has a complex gene regulation mechanism. While previous studies on the differences between CO and BS have mainly focused on cell structure and application, little is known regarding the differences between CO and BS in fungi on the transcriptome levels. MicroRNAs (miRNAs) are small noncoding RNAs crucial to gene regulation and cell function. Understanding the miRNA-like RNAs (milRNA) and mRNA expression profiles related to cell growth and cellular morphological changes would elucidate the roles of miRNAs in spore morphological differences. In this study, 4,646 differentially expressed genes (DEGs) were identified and mainly classified in the GO terms cell, cell part, biological process, and catalytic activity. The KEGG annotation suggested that they were enriched in amino acid biosynthesis, carbohydrate metabolism, ribosome, and oxidative phosphorylation and might be involved in cell activity and structure. There were 113 differentially expressed milRNAs (DEMs), targeting 493 DEGs. Target gene functional analysis revealed that the target genes were mainly enriched in RNA transport, purine metabolism, and the cell cycle. In addition, we identified essential genes from milRNA-mRNA pairs that might participate in cell budding growth and cell membrane and wall integrity, including adenosine deaminase, glycosyl hydrolase, and G-patch domain protein (dno-miR-328-3p), WD repeat-containing protein pop1 (age-miR-127), and GPI-anchored wall transfer protein (cgr-miR-598). MilRNAs might therefore play a crucial role in cell growth and cellular morphological changes as transcriptional and post-transcriptional regulators.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/1c/64/pjm-71-309.PMC9608168.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40389647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent Transmission and Prevalent Characterization of the Beijing Family <i>Mycobacterium tuberculosis</i> in Jiangxi, China.","authors":"Dong Luo,&nbsp;Shengming Yu,&nbsp;Yuyang Huang,&nbsp;Jiahuan Zhan,&nbsp;Qiang Chen,&nbsp;Liang Yan,&nbsp;Kaisen Chen","doi":"10.33073/pjm-2022-033","DOIUrl":"https://doi.org/10.33073/pjm-2022-033","url":null,"abstract":"<p><p>The Beijing genotype is the most common type of tuberculosis in Jiangxi Province, China. The association of population characteristics and their prevalence in the development of recent transmission is still unclear. 1,433 isolates were subjected to drug-resistant tests and MIRU-VNTR analysis. We compared differences in demographic characteristics and drug resistance patterns between the Beijing and non-Beijing family strains. We also explored the association of the clustering rate with the Beijing genotype of <i>Mycobacterium tuberculosis</i>. The Beijing genotype was dominant (78.16%). The results of MIRU-VNTR showed that 775 of 1,433 strains have unique patterns, and the remaining gather into 103 clusters. A recent transmission rate was 31.54% (452/1,433). The Beijing genotype strains were more likely to spread among the recurrent population (<i>p</i> = 0.004), people less than 50 years of age (<i>p</i> = 0.02 or 0.003), and the personnel in the northern regions (<i>p</i> = 0.03). Drug resistance patterns did not show significant differences between Beijing and non-Beijing genotype isolates. Furthermore, we found that HIV-positive cases had a lower clustering rate (<i>p</i> = 0.001). Our results indicated that the recurrent population and people under 50 years of age were more likely to be infected with the Beijing genotype of <i>M. tuberculosis</i>. The strains from the Beijing family were easier to cluster compared to strains isolated from the non-Beijing family. Social activity and AIDS substantially impacted the clustering rate of the Beijing genotype of <i>M. tuberculosis</i>. Multidrug resistant <i>M. tuberculosis</i> affected Beijing genotype transmission.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/4f/ca/pjm-71-371.PMC9608159.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40389170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genome-Guided Investigation Provides New Insights into Secondary Metabolites of <i>Streptomyces parvulus</i> SX6 from <i>Aegiceras corniculatum</i>.","authors":"Ngoc Tung Quach,&nbsp;Thi Hanh Nguyen Vu,&nbsp;Thi Lien Bui,&nbsp;Anh Tuan Pham,&nbsp;Thi Thu An Nguyen,&nbsp;Thi Thanh Xuan Le,&nbsp;Thi Thu Thuy Ta,&nbsp;Pravin Dudhagara,&nbsp;Quyet-Tien Phi","doi":"10.33073/pjm-2022-034","DOIUrl":"https://doi.org/10.33073/pjm-2022-034","url":null,"abstract":"<p><p>Whole-genome sequencing and genome mining are recently considered an efficient approach to shine more light on the underlying secondary metabolites of <i>Streptomyces</i>. The present study unearths the biosynthetic potential of endophytic SX6 as a promising source of biologically active substances and plant-derived compounds for the first time. Out of 38 isolates associated with <i>Aegiceras corniculatum</i> (L.) Blanco, <i>Streptomyces parvulus</i> SX6 was highly active against <i>Pseudomonas aeruginosa</i> ATCC® 9027™ and methicillin-resistant <i>Staphylococcus epidermidis</i> (MRSE) ATCC® 35984™. Additionally, <i>S. parvulus</i> SX6 culture extract showed strong cytotoxicity against Hep3B, MCF-7, and A549 cell lines at a concentration of 30 μg/ml, but not in non-cancerous HEK-293 cells. The genome contained 7.69 Mb in size with an average G + C content of 72.8% and consisted of 6,779 protein-coding genes. AntiSMASH analysis resulted in the identification of 29 biosynthetic gene clusters (BGCs) for secondary metabolites. Among them, 4 BGCs showed low similarity (28-67% of genes show similarity) to actinomycin, streptovaricin, and polyoxypeptin gene clusters, possibly attributed to antibacterial and anticancer activities observed. In addition, the complete biosynthetic pathways of plant-derived compounds, including daidzein and genistein were identified using genome mining and HPLC-DAD-MS analysis. These findings portray an exciting avenue for future characterization of promising secondary metabolites from mangrove endophytic <i>S. parvulus</i>.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/3e/58/pjm-71-381.PMC9608165.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40389546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Novel Bioflocculant Produced by <i>Cobetia marina</i> MCCC1113: Optimization of Fermentation Conditions by Response Surface Methodology and Evaluation of Flocculation Performance when Harvesting Microalgae.","authors":"Siyu Zeng,&nbsp;Yinghua Lu,&nbsp;Xueshan Pan,&nbsp;Xueping Ling","doi":"10.33073/pjm-2022-030","DOIUrl":"https://doi.org/10.33073/pjm-2022-030","url":null,"abstract":"<p><p>A preliminary study was carried out to optimize the culture medium conditions for producing a novel microbial flocculant from the marine bacterial species <i>Cobetia marina</i>. The optimal glucose, yeast extract, and glutamate contents were 30, 10, and 2 g/l, respectively, while the optimal initial pH of the culture medium was determined to be 8. Following response surface optimization, the maximum bioflocculant production level of 1.36 g/l was achieved, which was 43.40% higher than the original culture medium. Within 5 min, a 20.0% (v/v) dosage of the yielded bioflocculant applied to algal cultures resulted in the highest flocculating efficiency of 93.9% with <i>Spirulina platensis</i>. The bioflocculant from <i>C. marina</i> MCCC1113 may have promising application potential for highly productive microalgae collection, according to the findings of this study.</p>","PeriodicalId":20272,"journal":{"name":"Polish Journal of Microbiology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/c0/d7/pjm-71-341.PMC9608167.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40389651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}