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Journal articles on the topic 'Extracellular microorganism'

Author: Grafiati

Published: 15 June 2024

Last updated: 31 July 2025

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1

Park, Jeong-Su, and Jong-Moon Jeong. "Characterization of Extracellular Cholesterol Oxidase Produced from Soil Microorganism." Journal of the Korean Society of Food Science and Nutrition 37, no. 11 (2008): 1507–14. http://dx.doi.org/10.3746/jkfn.2008.37.11.1507.

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Castro, Guillermo R., Adrián O. Stettler, Marcela A. Ferrero, and Faustino Siñeriz. "Selection of an extracellular esterase-producing microorganism." Journal of Industrial Microbiology 10, no. 3-4 (1992): 165–68. http://dx.doi.org/10.1007/bf01569761.

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3

Pallares, Roger M., Nguyen T. K. Thanh, and Xiaodi Su. "Tunable plasmonic colorimetric assay with inverse sensitivity for extracellular DNA quantification." Chemical Communications 54, no. 80 (2018): 11260–63. http://dx.doi.org/10.1039/c8cc05465g.

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Beeler, Erik, Nicholas Choy, Jonathan Franks, Francis Mulcahy, and Om V. Singh. "Extracellular Synthesis and Characterization of Silver Nanoparticles from Alkaliphilic Pseudomonas sp." Journal of Nanoscience and Nanotechnology 20, no. 3 (2020): 1567–77. http://dx.doi.org/10.1166/jnn.2020.16496.

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Bio-nanotechnology offers eco-friendly processes for the synthesis of stable nanoparticles (NPs). We hypothesized that microorganisms isolated from the root nodules of leguminous plants would biosynthesize silver (Ag) bio-nanoparticles. Clover root nodules enriched with nutrient broth (NB) produced four distinct colonies on NA plates. Microbial colonies were purified by repeated streaking and designated as SS6, SS7, SS8, and SS9 for identification using 16S rRNA sequencing. Four species of Pseudomonas were identified with a similarity score of over 99% using the EZ Taxon search engine, and tes

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Bhola, Rahul, Shaily M. Bhola, Brajendra Mishra, and David L. Olson. "Microbiologically influenced corrosion and its mitigation: (A review)." Material Science Research India 7, no. 2 (2010): 407–12. http://dx.doi.org/10.13005/msri/070210.

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The microbiologically influenced corrosion (MIC) is one of the most common forms of corrosion that results from the presence and activity of microorganisms. The presence of microorganism aids in the formation of a bio film and constitutes various bacterial cells, extracellular polymeric substrates (EPS) and corrosion products. In this paper, a review on the importance of MIC and various ways to mitigate has been introduced; a brief description of the physical, chemical, electrochemical and biological mitigation methods for MIC has been included and EPS formation mechanism, chemical composition

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Tatischeff, Irène. "Assets of the non-pathogenic microorganism Dictyostelium discoideum as a model for the study of eukaryotic extracellular vesicles." F1000Research 2 (March 4, 2013): 73. http://dx.doi.org/10.12688/f1000research.2-73.v1.

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Dictyostelium discoideum microvesicles have recently been presented as a valuable model for eukaryotic extracellular vesicles. Here, the advantages of D. discoideum for unraveling important biological functions of extracellular vesicles in general are detailed. D. discoideum, a non-pathogenic eukaryotic microorganism, belongs to a billion-year-old Amoeboza lineage, which diverged from the animal-fungal lineage after the plant animal-split. During growth and early starvation-induced development, it presents analogies with lymphocytes and macrophages with regard to motility and phagocytosis capa

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Linger, Jeffrey G., William S. Adney, and Al Darzins. "Heterologous Expression and Extracellular Secretion of Cellulolytic Enzymes by Zymomonas mobilis." Applied and Environmental Microbiology 76, no. 19 (2010): 6360–69. http://dx.doi.org/10.1128/aem.00230-10.

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ABSTRACT Development of the strategy known as consolidated bioprocessing (CBP) involves the use of a single microorganism to convert pretreated lignocellulosic biomass to ethanol through the simultaneous production of saccharolytic enzymes and fermentation of the liberated monomeric sugars. In this report, the initial steps toward achieving this goal in the fermentation host Zymomonas mobilis were investigated by expressing heterologous cellulases and subsequently examining the potential to secrete these cellulases extracellularly. Numerous strains of Z. mobilis were found to possess endogenou

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Portiansky, Enrique L., María A. Quiroga, Mariana A. Machuca, and Carlos J. Perfumo. "Mycoplasma suis in naturally infected pigs: an ultrastructural and morphometric study." Pesquisa Veterinária Brasileira 24, no. 1 (2004): 1–5. http://dx.doi.org/10.1590/s0100-736x2004000100002.

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Swine eperythrozoonosis is a haemotrophic disease caused by Eperythrozoon suis, actually called Mycoplasma suis, an extracellular bacterial organism that apparently adheres to pig erythrocyte membrane, inducing its deformation and damage. Since little is known about the ultrastructural and morphometrical aspects of this microorganism, the present work aimed to deal with these issues. The ultrastructural study revealed the presence of structures corresponding to tubules disseminated throughout the soma of M. suis. A variable separation between the microorganism membrane and that of the erythroc

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Filio-Rodríguez, Georgina, Iris Estrada-García, Patricia Arce-Paredes, et al. "In vivo induction of neutrophil extracellular traps by Mycobacterium tuberculosis in a guinea pig model." Innate Immunity 23, no. 7 (2017): 625–37. http://dx.doi.org/10.1177/1753425917732406.

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In 2004, a novel mechanism of cellular death, called ‘NETosis’, was described in neutrophils. This mechanism, different from necrosis and apoptosis, is characterized by the release of chromatin webs admixed with microbicidal granular proteins and peptides (NETs). NETs trap and kill a variety of microorganisms. Diverse microorganisms, including Mycobacterium tuberculosis, are NET inducers in vitro. The aim of this study was to examine whether M. tuberculosis can also induce NETs in vivo and if the NETs are bactericidal to the microorganism. Guinea pigs were intradermally inoculated with M. tube

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Dunn, Michael F., and Arthur L. Karr. "Strain distribution and in planta production of an extracellular polysaccharide depolymerase from Bradyrhizobium japonicum." Canadian Journal of Microbiology 38, no. 8 (1992): 857–61. http://dx.doi.org/10.1139/m92-139.

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Thirty-four strains of Bradyrhizobium japonicum were screened for the in vitro production of an extracellular polysaccharide depolymerase active against the B. japonicum acidic extracellular polysaccharide that contains mannose, glucose, galactose, and 4-O-methylgalactose as neutral sugar components. Over 90% of tested strains producing this type of extracellular polysaccharide also produced the extracellular polysaccharide depolymerase, whereas strains producing a compositionally different extracellular polysaccharide did not. In addition, representatives of species related to B. japonicum by

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Ichishima, Eiji, Yukihiro Takada, Keijiro Taira, and Michio Takeuchi. "Specificities of extracellular and ribosomal serine proteinases from Bacillus natto, a food microorganism." Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology 869, no. 2 (1986): 178–84. http://dx.doi.org/10.1016/0167-4838(86)90292-x.

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12

Millach, Laia, Antoni Solé, and Isabel Esteve. "Role ofGeitlerinemasp. DE2011 andScenedesmussp. DE2009 as Bioindicators and Immobilizers of Chromium in a Contaminated Natural Environment." BioMed Research International 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/519769.

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The aim of this work was to study the potential of the two phototrophic microorganisms, both isolated from Ebro Delta microbial mats, to be used as bioindicators and immobilizers of chromium. The results obtained indicated that (i) the Minimum Metal Concentration (MMC) significantly affecting Chlorophyllaintensity inGeitlerinemasp. DE2011 andScenedesmussp. DE2009 was 0.25 µM and 0.75 µM, respectively, these values being lower than those established by current legislation, and (ii)Scenedesmussp. DE2009 was able to immobilize chromium externally in extracellular polymeric substances (EPS) and in

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Tramice, Annabella, Adele Cutignano, Annalaura Iodice, Annarita Poli, Ilaria Finore, and Giuseppina Tommonaro. "Involvement of a Quorum Sensing Signal Molecule in the Extracellular Amylase Activity of the Thermophilic Anoxybacillus amylolyticus." Microorganisms 9, no. 4 (2021): 819. http://dx.doi.org/10.3390/microorganisms9040819.

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Anoxybacillus amylolyticus is a moderate thermophilic microorganism producing an exopolysaccharide and an extracellular α-amylase able to hydrolyze starch. The synthesis of several biomolecules is often regulated by a quorum sensing (QS) mechanism, a chemical cell-to-cell communication based on the production and diffusion of small molecules named “autoinducers”, most of which belonging to the N-acyl homoserine lactones’ (AHLs) family. There are few reports about this mechanism in extremophiles, in particular thermophiles. Here, we report the identification of a signal molecule, the N-butanoyl

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Susilowati, Dwi Ningsih, Indah Sofiana, Kristina Dwi Atmini, and Erny Yuniarti. "SCREENING OF ACIT SULPHATE SOILS FUNGI FROM SOUTH KALIMANTAN AS SOURCE OF EXTRACELULAR ENZYMES." Agric 32, no. 1 (2020): 65–82. http://dx.doi.org/10.24246/agric.2020.v32.i1.p65-82.

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Kalimantan acid sulphate land has the potential to be developed into productive land, with good land optimization. Utilization of rhizosphere microorganism diversity, especially mold can potentially provide a solution in optimizing agricultural land, namely the ability to produce extracellular enzymes. This study aims to determine the potential of mold originating from acid sulphate fields in producing extracellular enzymes (pectinase, chitinase, glucanase, cellulase, and phosphatase). The study was conducted in June-July 2019 at the Microbiology Laboratory, Indonesian Center for Agricultural

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Speziale, Pietro, Carla Renata Arciola, and Giampiero Pietrocola. "Fibronectin and Its Role in Human Infective Diseases." Cells 8, no. 12 (2019): 1516. http://dx.doi.org/10.3390/cells8121516.

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Fibronectin is a multidomain glycoprotein ubiquitously detected in extracellular fluids and matrices of a variety of animal and human tissues where it functions as a key link between matrices and cells. Fibronectin has also emerged as the target for a large number of microorganisms, particularly bacteria. There are clear indications that the binding of microorganism’ receptors to fibronectin promotes attachment to and infection of host cells. Each bacterium may use different receptors which recognize specific fibronectin domains, mostly the N-terminal domain and the central cell-binding domain

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Wang, Xiaohai, Zhuanzhuan Shi, Zhikai Wang та Xiaoshuai Wu. "Electromagnetic Field Drives the Bioelectrocatalysis of γ-Fe2O3-Coated Shewanella putrefaciens CN32 to Boost Extracellular Electron Transfer". Materials 17, № 7 (2024): 1501. http://dx.doi.org/10.3390/ma17071501.

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The microbial hybrid system modified by magnetic nanomaterials can enhance the interfacial electron transfer and energy conversion under the stimulation of a magnetic field. However, the bioelectrocatalytic performance of a hybrid system still needs to be improved, and the mechanism of magnetic field-induced bioelectrocatalytic enhancements is still unclear. In this work, γ-Fe2O3 magnetic nanoparticles were coated on a Shewanella putrefaciens CN32 cell surface and followed by placing in an electromagnetic field. The results showed that the electromagnetic field can greatly boost the extracellu

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PĂCEŞILĂ, i., E. RADU, C. C. BÎRSAN, and M. CONSTANTIN. "The assessment of the soil mineralization processes along the traffic corridors from urban and rural areas in Romania." Romanian Biotechnological Letters 27, no. 1/2022 (2022): 3309–14. http://dx.doi.org/10.25083/rbl/27.1/3309-3314.

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The soils of the green areas located near the traffic corridors accumulate different pollutants, especially heavy metals, which have an important impact on the microbial decomposition processes. The extracellular enzymes can be used as an indicator of the metabolic activity of the microorganism communities. Four extracellular enzymes - α and β glucosidase, alkaline phosphatase and alanine aminopeptidase - were assessed in green areas close to the traffic zones in several urban, peri-urban and rural localities in Romania. The data showed that the highest values of enzymatic activities were regi

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Nadar, Sahaya, Tabassum Khan, Simon G. Patching, and Abdelwahab Omri. "Development of Antibiofilm Therapeutics Strategies to Overcome Antimicrobial Drug Resistance." Microorganisms 10, no. 2 (2022): 303. http://dx.doi.org/10.3390/microorganisms10020303.

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A biofilm is a community of stable microorganisms encapsulated in an extracellular matrix produced by themselves. Many types of microorganisms that are found on living hosts or in the environment can form biofilms. These include pathogenic bacteria that can serve as a reservoir for persistent infections, and are culpable for leading to a broad spectrum of chronic illnesses and emergence of antibiotic resistance making them difficult to be treated. The absence of biofilm-targeting antibiotics in the drug discovery pipeline indicates an unmet opportunity for designing new biofilm inhibitors as a

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19

Lin, Huihua, Shichang Sun, Zipeng Lin, et al. "Bio-carrier–enhanced aerobic granulation: Effects on the extracellular polymeric substances production and microorganism community." Chemosphere 280 (October 2021): 130756. http://dx.doi.org/10.1016/j.chemosphere.2021.130756.

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Reis Zambom, Carolina, Fauller Henrique da Fonseca, and Saulo Santesso Garrido. "Bio- and Nanotechnology as the Key for Clinical Application of Salivary Peptide Histatin: A Necessary Advance." Microorganisms 8, no. 7 (2020): 1024. http://dx.doi.org/10.3390/microorganisms8071024.

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Candida albicans is a common microorganism of human’s microbiota and can be easily found in both respiratory and gastrointestinal tracts as well as in the genitourinary tract. Approximately 30% of people will be infected by C. albicans during their lifetime. Due to its easy adaptation, this microorganism started to present high resistance to antifungal agents which is associated with their indiscriminate use. There are several reports of adaptive mechanisms that this species can present. Some of them are intrinsic alteration in drug targets, secretion of extracellular enzymes to promote host p

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El-Sousy, Sara M., Saadia M. Easa, Amira A. Hassan, and Abdel-Mohsen S. Ismail. "Production of a bacterial extracellular L-glutaminase possessing high antioxidant capability." Egyptian Pharmaceutical Journal 20, no. 1 (2021): 59–71. http://dx.doi.org/10.4103/epj.epj_51_20.

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Background and objectives L-glutaminase has utmost practical importance in many fields, such as medicine, pharmacy, and some industries as an effective antioxidant, anticancer, flavor enhancer, and used as an analytical reagent in the determination of glutamate and glutamine. The objective of the present article was to formulate the production medium and to pinpoint the proper growth conditions for the most potent microorganism producing highly active glutaminase enzyme. The general properties of the crude enzyme preparation were determined to detect the proper conditions for enzyme activity.

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Blé, Yatanan Casimir. "Antibiotic resistance of Aeromonas hydrophila isolated from frog Hoplobatrachus occipitalis consumed in Côte d'Ivoire." International Journal of Biosciences (IJB) 24, no. 3 (2024): 42–49. https://doi.org/10.12692/ijb/24.3.42-49.

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<em>Aeromonas hydrophila</em> is an opportunistic microorganism. It is widely involved in frog infections. <em>Hoplobatrachus occipitalis </em>is the species of frog most consumed in the different localities of Côte d’Ivoire. This research aimed to study the extracellular virulence factors and antibiotic resistance profiles of <em>A.</em> <em>hydrophila</em> strains isolated from <em>H. occipitalis. </em>The determination of extracellular virulence factors were performed onto 113 strains of <em>A. hydrophila</em> isolated from frogs

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Detusheva, E. V., P. V. Slukin, and N. K. Fursova. "Molecular-genetic methods for studying microbial biofilms." Bacteriology 5, no. 2 (2020): 49–55. http://dx.doi.org/10.20953/2500-1027-2020-2-49-55.

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The review article contains information on the clinical significance of microbial biofilms and the main modern molecular genetic methods used to study microbial biofilms: comparative study of genome, transcriptome and proteome of planktonic cells and biofilms; genetic control of biofilm extracellular matrix production; analysis of the contribution of individual genes and gene clusters to the formation of the biofilm phenotype; identification of microorganism species in polymicrobial biofilms. Key words: microbial biofilms, molecular genetic methods, genome, transcriptome, proteome, microbial s

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Amrutha, Philip, Mathews Smitha, Thomas Dona, and Sanil Shradha. "Isolation, Identification and Characterization of Amylase Producing Microorganism from Soil." International Journal of Innovative Science and Research Technology 8, no. 3 (2023): 529–38. https://doi.org/10.5281/zenodo.8296656.

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The enzyme Amylase catalyses the hydrolysis of starch into oligosaccharides and sugars. Bacteria isolated from the soil are the most common sources of amylase. In this study, soil samples (n=30) collected from different sites of Changanacherry were taken for screening amylase-producing bacteria. The samples were serially diluted and representative bacterial flora was isolated by plating on the nutrient agar media. The amylase production of these isolates was assessed using starch agar. Thirteen isolates were selected for further investigations. The growth conditions of these isolates were opti

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Pagliai, F. A., and Carlos A. Jerez. "The Secretome of the Extremophilic Acidithiobacillus Ferrooxidans ATCC 23270." Advanced Materials Research 71-73 (May 2009): 183–86. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.183.

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Acidithiobacillus ferrooxidans is a chemolithoautotrophic acidophile capable of catalyzing the oxidation of ferrous iron and sulfur reducing compounds. During the dissolution of ores A. ferrooxidans adheres to the solid substrate by hydrophobic and hydrophilic interactions and also extracellular polymeric substances may be involved. Nevertheless, many of these agents that participate in the process are unknown. Therefore, the identification and characterization of the extracellular proteome of A. ferrooxidans was addressed during this work. First, by searching the genome of A. ferrooxidans ATC

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Ortiz, Martha L. "Aproximaciones a la comprensión de la degradación de la lignina." Orinoquia 13, no. 2 (2009): 137–44. http://dx.doi.org/10.22579/20112629.208.

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Titulo en ingles: Approaches to understanding lignin degradation.RESUMEN: El objetivo de esta revisión es reunir los hallazgos más recientes que aportan a la comprensión de las rutas metabólicas que intervienen en la degradación del biopolímero más recalcitrante del planeta: la lignina. Esta le proporcionó a las plantas resistencia mecánica en sus tejidos para colonizar la tierra y una barrera fisicoquímica ante la infección microbiana. Debido a su naturaleza recalcitrante, la lignina es el precursor principal para la síntesis de la reserva de materia orgánica del suelo, regulando el ciclo del

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Ge, Li Yun, Huan Huan Deng, De Xiang Gao, and Hong Wu Wang. "The Effect of Ferric Ion and Copper Ion on Extracellular Polymeric Substances." Applied Mechanics and Materials 260-261 (December 2012): 1035–40. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.1035.

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Extracellular polymeric substances (EPS), which are vital cellular polymeric substances, play an important role in biological wastewater treatment. In this paper, four SBRs (blank, added 20mg/L Fe3+, added 40mg/L Cu2+, added both 20mg/L Fe3+ and 40mg/L Cu2+, respectively) were used to investigate the effect of Fe3+ and Cu2+ on EPS produced by microorganism from activated sludge. Carbohydrate and protein were main components of EPS. The total content of EPS, the content of protein and carbohydrate, and the content of DNA in EPS were detected. The results show metal ion had an effect on the form

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Wu, Guangxue, and Michael Rodgers. "Nutrient removal, microbial community and sludge settlement in anaerobic/aerobic sequencing batch reactors without enhanced biological phosphorus removal." Water Science and Technology 61, no. 10 (2010): 2433–41. http://dx.doi.org/10.2166/wst.2010.079.

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Nutrient removal, microbial community and sludge settlement were examined in two 3-litre laboratory-scale anaerobic/aerobic sequencing batch reactors (SBRs). One SBR was operated at 10°C and the other SBR at 20°C. Different from conventional enhanced biological phosphorus removal, most of the soluble sodium acetate was removed in the aerobic phase and no organic carbon uptake or biological phosphorus release occurred in the anaerobic phase. In this type of anaerobic/aerobic SBR, the phosphorus removal and sludge settlement seemed to be unstable, and the dominant microorganism was Zoogloea sp.

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Highsmith, Anita K., Phuong Nhan Le, Rima F. Khabbaz, and Van P. Munn. "Characteristics of Pseudomonas aeruginosa Isolated From Whirlpools and Bathers." Infection Control 6, no. 10 (1985): 407–12. http://dx.doi.org/10.1017/s0195941700063499.

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AbstractPseudomonas aeruginosa is the most frequently isolated microorganism from whirlpool water and lesions associated with outbreaks of dermatitis and folliculitis related to whirlpool exposure. Strains were selected from 19 outbreaks of P. aeruginosa infections (1977 to 1983) associated with whirlpool use; they were examined to determine if the strains possessed unique virulence factors or characteristics that might aid in their selection in the environment.P. aeruginosa, 011, was the predominant serotype isolated from whirlpool water as well as from bathers with dermatitis or folliculitis

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Özçoban, Afranur, Ayşe İlayda Boyacı, and Hale İnci Öztürk. "Microbial Exopolysaccharides, Their Structures, Formation Mechanisms, and Effects on Human Health: Food-Related Microorganisms." Turkish Journal of Agriculture - Food Science and Technology 12, s2 (2024): 2429–40. https://doi.org/10.24925/turjaf.v12is2.2429-2440.6955.

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A biofilm is a complex matrix formed by microorganisms that includes exopolysaccharides, proteins, extracellular DNA, various enzymes, and the microorganisms themselves. Biofilm cell is a more stable form of microorganism than planktonic cell. Microbial cells attach themselves to the surface after certain signals or changes, colonize to create a more favorable environment for their growth and viability, and secrete exopolysaccharide. This component is the basic matrix of biofilm. The diversity of exopolysaccharides within biofilms varies significantly depending on their specific composition, c

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Sukhina, M. A., I. A. Kalashnikova, V. N. Kashnikov, A. V. Veselov, V. I. Mikhalevskaya, and A. Yu Piyadina. "EFFECT OF ANTIMICROBIAL AGENTS ON THE BIOFILM GROWTH OF CLINICAL ISOLATES." Koloproktologia, no. 2 (June 30, 2018): 78–84. http://dx.doi.org/10.33878/2073-7556-2018-0-2-78-84.

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OBJECTIVE. To study the effect of active extracellular substances of lactobacilli and antimicrobial agents on the inhibition and destruction of the biofilms formed clinically relevant microorganism strains. MATERIALS AND METHODS. The study of the impact of different agents on the biofilmformation and growth was carried out on resistant clinical strains of microorganisms obtainedfrom patients with post-surgical infectious inflammatory complications. We used wound dressing solution, cutaneous antiseptic, filtrates of 19 clinical strains of lactobacilli and a strain of Lactobacillus plantarum fro

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Mejía-Manzano, Luis Alberto, Patricia Vázquez-Villegas, Luis Vicente Prado-Cervantes, et al. "Advances in Material Modification with Smart Functional Polymers for Combating Biofilms in Biomedical Applications." Polymers 15, no. 14 (2023): 3021. http://dx.doi.org/10.3390/polym15143021.

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Biofilms as living microorganism communities are found anywhere, and for the healthcare sector, these constitute a threat and allied mechanism for health-associated or nosocomial infections. This review states the basis of biofilms and their formation. It focuses on their relevance for the biomedical sector, generalities, and the major advances in modified or new synthesized materials to prevent or control biofilm formation in biomedicine. Biofilm is conceptualized as an aggregate of cells highly communicated in an extracellular matrix, which the formation obeys to molecular and genetic basis.

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Tran, My Linh, Thi Hoe Pham, Chi Mai Nguyen, Khac Ban Ninh, Huong Giang Vu, and Tuong Van Nguyen. "Isolation and properties of endophytic bacteria and actinomycetes of <i>Catharanthus roseus</i> (L) G. Don grown in Nha Trang, Vietnam." Academia Journal of Biology 46, no. 2 (2024): 71–82. http://dx.doi.org/10.15625/2615-9023/18984.

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Endophytic microbes of medicinal plants are known to involve the synthesis of several bioactive compounds, which promote plant growth and resistance to diseases. In order to investigate endophytes in the important medicinal plant Catharanthus roseus, 16 endophytic microorganism strains were isolated from root samples of C. roseus var. roseus and C. roseus var. ocellatus naturally growing in coastal areas of Nha Trang, Vietnam. Based on morphological characteristics and 16S rDNA gene marker sequences, four actinomycetes of Streptomyces and Microbiospora genera and twelve bacterial strains belon

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Nied, Maieli Maiara, Rodrigo Alex Arthur, Ewelyn De Freitas Farias, and Sandra Liana Henz. "Effect of Stevia rebaudiana Bertoni infusion on enamel demineralization and dental biofilm formation: an in-situ study." Revista da Faculdade de Odontologia de Porto Alegre 63, no. 2 (2023): 12–23. http://dx.doi.org/10.22456/2177-0018.126520.

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Aim: Stevia rebaudiana Bertoni (Stevia) is a natural non-caloric sweetener that can modify the cariogenicity of biofilms. This study aimed to evaluate the effect of Stevia infusion in microbial and biochemical composition of biofilms formed in the presence of sucrose and on enamel demineralization. Materials and Methods: In a cross-over design, eleven volunteers wore an intraoral palatal appliance containing 4 slabs of bovine enamel during 3 phases of 7 days each. Sucrose solution (20%) was dripped onto slabs 8 times/day and 0.9% sodium chloride (NaCl), 0.12% chlorhexidine (CHX), or 5% infusio

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Drozdova, Margarita, Anna Pozdnyakova, Maria Osintseva, Nadezhda Burova, and Varvara Minina. "The microorganism-plant system for remediation of soil exposed to coal mining." Foods and Raw Materials 9, no. 2 (2021): 406–18. http://dx.doi.org/10.21603/2308-4057-2021-2-406-418.

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Introduction. Coal mining causes a radical transformation of the soil cover. Research is required into modern methods and complementary technologies for monitoring technogenic landscapes and their remediation. Our study aimed to assess soil and rhizosphere microorganisms and their potential uses for the remediation of technogenic soils in Russian coal regions. Study objects and methods. We reviewed scientific articles published over the past five years, as well as those cited in Scopus and Web of Science. Results and discussion. Areas lying in the vicinity of coal mines and coal tr

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Thekra, Sideeq Al-Tayawi, M. Adel Esraa, and H. Omer Farah. "An Overview of Biofilm as a Virulence Factor for Bacteria to Survive in the Harsh Environment." INTERNATIONAL JOURNAL OF MEDICAL SCIENCE AND CLINICAL RESEARCH STUDIES 03, no. 06 (2023): 1188–97. https://doi.org/10.5281/zenodo.8093241.

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Microbial biofilms are collections of grouped microbial cells enmeshed in an extracellular polymeric substances (EPS) matrix that they have self-assembled. Biofilms are resistant to harsh environments and can serve as "protective clothing" for bacteria by shielding them from ultraviolet (UV) radiation, extreme temperatures, pH ranges, high salinity, high pressure, inadequate nutrition, antibiotics, etc. Research on biofilms in recent years has mostly concentrated on biofilm-associated illnesses and methods for eradicating microbial biofilms.

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Nevin, Kelly P., and Derek R. Lovley. "Mechanisms for Accessing Insoluble Fe(III) Oxide during Dissimilatory Fe(III) Reduction by Geothrix fermentans." Applied and Environmental Microbiology 68, no. 5 (2002): 2294–99. http://dx.doi.org/10.1128/aem.68.5.2294-2299.2002.

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ABSTRACT Mechanisms for Fe(III) oxide reduction were investigated in Geothrix fermentans, a dissimilatory Fe(III)-reducing microorganism found within the Fe(III) reduction zone of subsurface environments. Culture filtrates of G. fermentans stimulated the reduction of poorly crystalline Fe(III) oxide by washed cell suspensions, suggesting that G. fermentans released one or more extracellular compounds that promoted Fe(III) oxide reduction. In order to determine if G. fermentans released electron-shuttling compounds, poorly crystalline Fe(III) oxide was incorporated into microporous alginate bea

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Simon, L., B. Bouchet, C. Caye-Vaugien, and D. J. Gallant. "Pullulan elaboration and differentiation of the resting forms in Aureobasidium pullulans." Canadian Journal of Microbiology 41, no. 1 (1995): 35–45. http://dx.doi.org/10.1139/m95-005.

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To identify the cellular forms that are responsible for the synthesis of pullulan produced by Aureobasidium pullulans, we performed cytochemical and ultrastructural localizations of glucan in the cellular forms of this microorganism (blastospores and resting forms). Growth conditions, cell populations, and pullulan production were studied concurrently. Our results are consistent with a model in which the resting forms (swollen cells and chlamydospores) might be primarily involved in this extracellular polysaccharide elaboration. At the cellular level, pullulan production could be the result of

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Khushk, Imrana. "Environmental Friendly Production of Amylase from Aspergillus niger EFRL-FC-024 Using Corn Waste as Carbon Source." Pakistan Journal of Analytical & Environmental Chemistry 22, no. 1 (2021): 165–71. http://dx.doi.org/10.21743/pjaec/2021.06.17.

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Amylase is an indispensable and industrially important enzyme that hydrolyzes carbohydrates particularly starch into simple sugars. Amylase enzymes have been isolated from various sources such as microbes, animals and plants. However, microorganisms are highly preferred as compared to plants and animal sources. Amylases of fungal origin are highly stable compared to amylases produced by bacterial species. The aim of this study was to investigate the production of extracellular amylase enzyme from Aspergillus niger EFRL-FC-024 using sugarcane bagasse and corn waste as an energy source under sub

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Majumdar, Udayan, Thrisha Alexander, Morris Waskar, and Manoj V. Dagaonkar. "Effect of biofilm on colloid attachment in saturated porous media." Water Science and Technology 70, no. 2 (2014): 241–48. http://dx.doi.org/10.2166/wst.2014.197.

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Biofilm plays an important role in controlling the transport of colloids in a porous media. Biofilms are formed when micro-organisms come in contact with substrates, and are able to attach and grow with availability of nutrients. The microorganisms get embedded in a matrix of the substrate and extracellular polymeric substances which are responsible for the morphology, physico-chemical properties, structure and coherence of the biofilm. In this study, the effect of biofilm and its aging on colloid removal was studied on a glass bead column. Oocysts, polystyrene microspheres and inorganic collo

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Majeed, Muhammed, Shaheen Majeed, Kalyanam Nagabhushanam, Lincy Lawrence, Sivakumar Arumugam, and Lakshmi Mundkur. "Skin Protective Activity of LactoSporin-the Extracellular Metabolite from Bacillus Coagulans MTCC 5856." Cosmetics 7, no. 4 (2020): 76. http://dx.doi.org/10.3390/cosmetics7040076.

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Background: Probiotics and their products are increasingly used in skincare in recent years. Postbiotics are defined as any substance derived through the metabolic activity of a probiotic microorganism, which exerts a direct or indirect beneficial effect on the host. The extracellular metabolites of probiotic bacteria have antimicrobial activities, protect against acne, and improve skin condition. We studied skin protective activities of the extracellular metabolite (LactoSporin) of a spore-forming probiotic Bacillus coagulans MTCC 5856 in vitro. Methods: LactoSporin was evaluated for antioxid

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Sahu, Sudarshan, Avinash Sharma, Soham Mukherjee, et al. "Role of Nanofibers in Encapsulation of the Whole Cell." International Journal of Polymer Science 2021 (November 24, 2021): 1–9. http://dx.doi.org/10.1155/2021/4250122.

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In the field of biomaterial research, the electrospinning device is now used to manufacture nanofibers that can be used to encapsulate whole microorganisms such as bacterial cells, funguses, viruses, and even spores. The nanofiber encapsulated cells will have greater significance in the coming future because of their wide variety of applications in various fields. Nanofibers act as microorganism reservoir systems that enhance their properties such as viability, controlled release of products, biomedical applications, and bioremediation. The effect of electrostatic forces on a droplet of liquid

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KOZIEŁ, NINA, ELŻBIETA KUKIER, and KRZYSZTOF KWIATEK. "Clostridium perfringens – epidemiological importance and diagnostics." Medycyna Weterynaryjna 75, no. 01 (2019): 6161–2019. http://dx.doi.org/10.21521/mw.6161.

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Clostridium perfringens is one of the most widespread anaerobic spore forming bacteria found in the environment. The toxotype A of the species inhabits the gastrointestinal tract of birds and mammals exhibiting pathogenic properties in the immunocompromised host. The virulence determinants of C. perfringens are toxins and extracellular enzymes which cause gas gangrene, enteritis necroticans, food poisoning, and non-food borne gastrointestinal infections in humans. The young animals suffer from enterotoxaemia, dysentery and necrotic enteritis due to the anaerobic spore forming bacilli. This art

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Ren, Kexin, Qiang Wang, Mengkai Hu, et al. "Research Progress on the Effect of Autolysis to Bacillus subtilis Fermentation Bioprocess." Fermentation 8, no. 12 (2022): 685. http://dx.doi.org/10.3390/fermentation8120685.

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Bacillus subtilis is a gram-positive bacterium, a promising microorganism due to its strong extracellular protein secretion ability, non-toxic, and relatively mature industrial fermentation technology. However, cell autolysis during fermentation restricts the industrial application of B. subtilis. With the fast advancement of molecular biology and genetic engineering technology, various advanced procedures and gene editing tools have been used to successfully construct autolysis-resistant B. subtilis chassis cells to manufacture various biological products. This paper first analyses the causes

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El-Shanshoury, Abd El-Raheem R., Sobhy E. ElSilk, and Mohamed E. Ebeid. "Extracellular Biosynthesis of Silver Nanoparticles Using Escherichia coli ATCC 8739, Bacillus subtilis ATCC 6633, and Streptococcus thermophilus ESh1 and Their Antimicrobial Activities." ISRN Nanotechnology 2011 (August 17, 2011): 1–7. http://dx.doi.org/10.5402/2011/385480.

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The development of reliable and eco-friendly organisms of silver nanomaterials is an important aspect of current nanotechnology research and application. Recently, microorganisms have been explored as potential biofactory for synthesis of silver nanoparticles. In this study, through screening of common bacteria, we report extracellular biosynthesis of metallic silver nanoparticles by the reduction of aqueous Ag+ using Escherichia coli ATCC 8739, Bacillus subtilis ATCC 6633, and Streptococcus thermophilus ESh1 as potential candidates for the rapid synthesis of silver nanoparticles. The culture

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Shao, Qi, Shihui Yan, Xin Sun, et al. "Applications of Yeasts in Heavy Metal Remediation." Fermentation 11, no. 5 (2025): 236. https://doi.org/10.3390/fermentation11050236.

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Yeasts have been extensively recognized as a type of model microorganism due to their facile cultivation, short growth cycle, and genetic stability. Different yeast strains, such as Saccharomyces cerevisiae and Rhodotorula mucilaginosa, have exhibited notable sorption capacities for heavy metals and metalloids. Yeast employs diverse pathways for detoxifying heavy metals via its cell walls, intracellular organelles, and extracellular polymeric substances (EPSs). The cell wall has many functional groups to adsorb metals, decreasing their concentrations in the environment. In intracellular region

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Baktir, Afaf, Zumrotul Koiriyah, and Ali Rohman. "A THERMOPHILIC MICROBE PRODUCING DEXTRANASE FROM HEATED SUGAR CANE." Indonesian Journal of Chemistry 5, no. 3 (2010): 224–27. http://dx.doi.org/10.22146/ijc.21794.

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A thermophilic aerobe microorganism designated NP4, was isolated from the heated sugar cane. It grew on dextran, and produced a thermoactive extracellular dextranase. Screening and isolation was done by assay of dextranase activity semi quantitatively on solid medium containing blue dextran. It provided several colonies with different morphology exhibited decolourized zones around, on culture plates containing blue dextran 2000R. The screening resulted in isolation of one microbe which efficiently assimilate dextran as carbon source. Dextranase production from the choised strain in liquid medi

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Zhao, Zhiling, Yongji Zhang, Lu Wang, and Wenhang Shi. "Effect of Particle Concentration and Pipe Materials on the Formation of Biofilms in Drinking Water Distribution Systems." Water 14, no. 2 (2022): 224. http://dx.doi.org/10.3390/w14020224.

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Microorganism rebreeding and biofilm shedding enter the water body in the process of a drinking water distribution system (DWDS), which poses a threat to public health. Particles in water can gather pollutants as well as providing favorable growth conditions for bacteria. To date, there are a few studies which focus on the relationship between particles and biofilm formation. Therefore, the microbial diversity of biofilms in the different pipe materials and the effect on particle concentration on biofilm formation were investigated in this study. Experiments were carried out under a simulative

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Lauro, Federico M., Khiem Tran, Alessandro Vezzi, Nicola Vitulo, Giorgio Valle, and Douglas H. Bartlett. "Large-Scale Transposon Mutagenesis of Photobacterium profundum SS9 Reveals New Genetic Loci Important for Growth at Low Temperature and High Pressure." Journal of Bacteriology 190, no. 5 (2007): 1699–709. http://dx.doi.org/10.1128/jb.01176-07.

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ABSTRACT Microorganisms adapted to piezopsychrophilic growth dominate the majority of the biosphere that is at relatively constant low temperatures and high pressures, but the genetic bases for the adaptations are largely unknown. Here we report the use of transposon mutagenesis with the deep-sea bacterium Photobacterium profundum strain SS9 to isolate dozens of mutant strains whose growth is impaired at low temperature and/or whose growth is altered as a function of hydrostatic pressure. In many cases the gene mutation-growth phenotype relationship was verified by complementation analysis. Th

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Zheng, Xiao-Chuan, Hong-Shan Li, Zi-Han Wang, Zhong-Fang Sun, and Lei Zhao. "Intermediates Production in Methane Oxidation Coupled with Denitrification: Current Status, Challenges, and Future Opportunities." Fermentation 9, no. 7 (2023): 645. http://dx.doi.org/10.3390/fermentation9070645.

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Climate warming is a hot environmental issue of global concern. As one of the major methane sinks, the process of methane oxidation coupled with denitrification (MOD) reduces the environmental impact brought by the greenhouse effect and water eutrophication. In addition, as an energy substance, methane can also improve its economic value by transforming into other liquid chemicals. Previous studies on the mechanism of the process have mainly focused on the extracellular electron transfer between species. However, in recent years, the production of intermediates influenced by different factors,

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