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Keryan A, Bazukyan I, Trchounian A. Lactobacilli isolated from the Armenian fermented milk product matsoun: Growth properties, antibacterial and proteolytic activity and their dependence on pH. INT J DAIRY TECHNOL 2016. [DOI: 10.1111/1471-0307.12353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andranik Keryan
- Department of Microbiology, Plants and Microbes Biotechnology; Faculty of Biology; Yerevan State University; 1 A. Manoukian Str. Yerevan 0025 Armenia
| | - Inga Bazukyan
- Department of Microbiology, Plants and Microbes Biotechnology; Faculty of Biology; Yerevan State University; 1 A. Manoukian Str. Yerevan 0025 Armenia
| | - Armen Trchounian
- Department of Microbiology, Plants and Microbes Biotechnology; Faculty of Biology; Yerevan State University; 1 A. Manoukian Str. Yerevan 0025 Armenia
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Hakobyan L, Harutyunyan K, Harutyunyan N, Melik-Andreasyan G, Trchounian A. Adhesive Properties and Acid-Forming Activity of Lactobacilli and Streptococci Under Inhibitory Substances, Such as Nitrates. Curr Microbiol 2016; 72:776-82. [PMID: 26942420 DOI: 10.1007/s00284-016-1017-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/24/2016] [Indexed: 01/13/2023]
Abstract
One of the main requirements for probiotics is their ability to survive during passage through gastrointestinal tract and to maintain their activity at different adverse conditions. The aim of the study was to look for the strains of lactobacilli and streptococci with high adhesive properties even affected by inhibitory substances, such as nitrates (NO3 (-)). To study the adhesion properties hemagglutination reaction of bacterial cells with red blood cells of different animals and humans was used. The acid formation ability of bacteria was determined by the method of titration after 7 days of incubation in the sterile milk. These properties were investigated at different concentrations of NO3 (-). The high concentration (mostly ≥2.0 %) NO3 (-) inhibited the growth of both lactobacilli and streptococci, but compared with streptococcal cultures lactobacilli, especially Lactobacillus acidophilus Ep 317/402, have shown more stability and higher adhesive properties. In addition, the concentrations of NO3 (-) of 0.5-2.0 % decreased the acid-forming activity of the strains, but even under these conditions they coagulated milk and, in comparison to control, formed low acidity in milk. Thus, the L. acidophilus Ep 317/402 with high adhesive properties has demonstrated a higher activity of NO3 (-) transformation.
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Affiliation(s)
- L Hakobyan
- Institute of Microbiology, Scientific and Production Center "Armbiotechnology", National Academy of Sciences of Armenia, 0056, Yerevan, Armenia
| | - K Harutyunyan
- Institute of Microbiology, Scientific and Production Center "Armbiotechnology", National Academy of Sciences of Armenia, 0056, Yerevan, Armenia.,Department of Microbiology, Plants and Microbes Biotechnology, Faculty of Biology, Yerevan State University, 1 A. Manoukian Str., 0025, Yerevan, Armenia
| | - N Harutyunyan
- Institute of Epidemiology, Virology and Medical Parasitology After A.B. Alexanyan Ministry of Health of Armenia, 0060, Yerevan, Armenia
| | - G Melik-Andreasyan
- Institute of Epidemiology, Virology and Medical Parasitology After A.B. Alexanyan Ministry of Health of Armenia, 0060, Yerevan, Armenia
| | - A Trchounian
- Department of Microbiology, Plants and Microbes Biotechnology, Faculty of Biology, Yerevan State University, 1 A. Manoukian Str., 0025, Yerevan, Armenia.
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Li T, Deng X, Wang J, Chen Y, He L, Sun Y, Song C, Zhou Z. Biodegradation of nitrobenzene in a lysogeny broth medium by a novel halophilic bacterium Bacillus licheniformis. MARINE POLLUTION BULLETIN 2014; 89:384-389. [PMID: 25440194 DOI: 10.1016/j.marpolbul.2014.09.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 09/15/2014] [Accepted: 09/17/2014] [Indexed: 06/04/2023]
Abstract
The Bacillus licheniformis strain YX2, a novel nitrobenzene-degrading halophilic bacterium, was isolated from active sludge obtained from a pesticide factory. Strain YX2 can withstand highly acidic and alkaline conditions and high temperatures. Degradation of nitrobenzene (200mgL(-1)) by YX2 exceeded 70% after 72h in lysogeny broth medium (pH 4-9). Under optimal degradation conditions (33°C, pH 7 in LB medium) YX2 degraded 50, 100, 200, and 600mgL(-1) nitrobenzene within 36, 36, 72, and 156h, respectively. Even in the presence of benzene, phenol or aniline, strain YX2 efficiently degraded nitrobenzene. Furthermore, strain YX2 completely degraded 600mgL(-1) nitrobenzene in 7% NaCl (w/w). Thus, our data show that strain YX2 may have promise for removing nitrobenzene from complex wastewaters with high salinity and variable pH.
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Affiliation(s)
- Tian Li
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Xinping Deng
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Jinjun Wang
- College of Plant Protection, Southwest University, Chongqing 400715, PR China.
| | - Yucheng Chen
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Lin He
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Yuchuan Sun
- School of Geography Sciences, Southwest University, Chongqing 400715, PR China
| | - Caixia Song
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Zhifeng Zhou
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China
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Improving cell yield and lactic acid production of Lactococcus lactis ssp. cremoris by a novel submerged membrane fermentation process. J Memb Sci 2012. [DOI: 10.1016/j.memsci.2012.02.042] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Papadimitriou K, Boutou E, Zoumpopoulou G, Tarantilis PA, Polissiou M, Vorgias CE, Tsakalidou E. RNA arbitrarily primed PCR and fourier transform infrared spectroscopy reveal plasticity in the acid tolerance response of Streptococcus macedonicus. Appl Environ Microbiol 2008; 74:6068-76. [PMID: 18689510 PMCID: PMC2565966 DOI: 10.1128/aem.00315-08] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2008] [Accepted: 08/03/2008] [Indexed: 11/20/2022] Open
Abstract
We have previously reported that an acid tolerance response (ATR) can be induced in Streptococcus macedonicus cells at mid-log phase after autoacidification, transient exposure to acidic pH, or acid habituation, as well as at stationary phase. Here, we compared the transcriptional profiles of these epigenetic phenotypes, by RNA arbitrarily primed PCR (RAP-PCR), and their whole-cell chemical compositions, by Fourier transform infrared spectroscopy (FT-IR). RAP-PCR fingerprints revealed significant differences among the phenotypes, indicating that gene expression during the ATR is influenced not only by the growth phase but also by the treatments employed to induce the response. The genes coding for the mannose-specific IID component, the 1,2-diacylglycerol 3-glucosyltransferase, the 3-oxoacyl-acyl carrier protein, the large subunit of carbamoyl-phosphate synthase, and a hypothetical protein were found to be induced at least under some of the acid-adapting conditions. Furthermore, principal component analysis of the second-derivative-transformed FT-IR spectra segregated S. macedonicus phenotypes individually in all spectral regions that are characteristic for major cellular constituents like the polysaccharides of the cell wall, fatty acids of the cell membrane, proteins, and other compounds that absorb in these regions. These findings provide evidence for major changes in cellular composition due to acid adaptation that were clearly different to some extent among the phenotypes. Overall, our data demonstrate the plasticity in the ATR of S. macedonicus, which reflects the inherent ability of the bacterium to adjust the response to the distinctiveness of the imposed stress condition, probably to maximize its adaptability.
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Affiliation(s)
- Konstantinos Papadimitriou
- Laboratory of Dairy Research, Department of Food Science and Technology, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece
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Papadimitriou K, Pratsinis H, Nebe-von-Caron G, Kletsas D, Tsakalidou E. Acid tolerance of Streptococcus macedonicus as assessed by flow cytometry and single-cell sorting. Appl Environ Microbiol 2007; 73:465-76. [PMID: 17098924 PMCID: PMC1796968 DOI: 10.1128/aem.01244-06] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Accepted: 10/27/2006] [Indexed: 12/27/2022] Open
Abstract
An in situ flow cytometric viability assay employing carboxyfluorescein diacetate and propidium iodide was used to identify Streptococcus macedonicus acid tolerance phenotypes. The logarithmic-phase acid tolerance response (L-ATR) was evident when cells were (i) left to autoacidify unbuffered medium, (ii) transiently exposed to nonlethal acidic pH, or (iii) systematically grown under suboptimal acidic conditions (acid habituation). Stationary-phase ATR was also detected; this phenotype was gradually degenerated while cells resided at this phase. Single-cell analysis of S. macedonicus during induction of L-ATR revealed heterogeneity in both the ability and the rate of tolerance acquisition within clonal populations. L-ATR was found to be partially dependent on de novo protein synthesis and compositional changes of the cell envelope. Interestingly, acid-habituated cells were interlaced in lengthier chains and exhibited an irregular pattern of active peptidoglycan biosynthesis sites when probed with BODIPY FL vancomycin. L-ATR caused cells to retain their membrane potential after lethal challenge, as judged by ratiometric analysis with oxonol [DiBAC(4)(3)]. Furthermore, F-ATPase was important during the induction of L-ATR, but in the case of a fully launched response, inhibition of F-ATPase affected acid resistance only partially. Activities of both F-ATPase and the glucose-specific phosphoenolpyruvate-dependent phosphotransferase system were increased after L-ATR induction, distinguishing S. macedonicus from oral streptococci. Finally, the in situ viability assessment was compared to medium-based recovery after single-cell sorting, revealing that the culturability of subpopulations with identical fluorescence characteristics is dependent on the treatments imposed to the cells prior to acid challenge.
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Affiliation(s)
- Konstantinos Papadimitriou
- Laboratory of Dairy Research, Department of Food Science and Technology, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece
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Leverrier P, Fremont Y, Rouault A, Boyaval P, Jan G. In vitro tolerance to digestive stresses of propionibacteria: influence of food matrices. Food Microbiol 2005. [DOI: 10.1016/j.fm.2004.05.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Cotter PD, Hill C. Surviving the acid test: responses of gram-positive bacteria to low pH. Microbiol Mol Biol Rev 2003; 67:429-53, table of contents. [PMID: 12966143 PMCID: PMC193868 DOI: 10.1128/mmbr.67.3.429-453.2003] [Citation(s) in RCA: 772] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Gram-positive bacteria possess a myriad of acid resistance systems that can help them to overcome the challenge posed by different acidic environments. In this review the most common mechanisms are described: i.e., the use of proton pumps, the protection or repair of macromolecules, cell membrane changes, production of alkali, induction of pathways by transcriptional regulators, alteration of metabolism, and the role of cell density and cell signaling. We also discuss the responses of Listeria monocytogenes, Rhodococcus, Mycobacterium, Clostridium perfringens, Staphylococcus aureus, Bacillus cereus, oral streptococci, and lactic acid bacteria to acidic environments and outline ways in which this knowledge has been or may be used to either aid or prevent bacterial survival in low-pH environments.
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Affiliation(s)
- Paul D Cotter
- Department of Microbiology and National Food Biotechnology Centre, University College Cork, Cork, Ireland
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Jobin MP, Clavel T, Carlin F, Schmitt P. Acid tolerance response is low-pH and late-stationary growth phase inducible in Bacillus cereus TZ415. Int J Food Microbiol 2002; 79:65-73. [PMID: 12382686 DOI: 10.1016/s0168-1605(02)00180-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The acid tolerance of foodborne pathogen Bacillus cereus TZ415 was examined. B. cereus was more tolerant to an acid challenge at pH 4.0 when cells were grown at low pH in regulated batch cultures of rich J Broth (JB) medium. The pH-inducible acid tolerance response (ATR) was maximal at pH 5.0, a sublethal growth condition inducing a remarkable cell elongation. During growth at regulated pH 7.0 and 6.0, B. cereus TZ415 became more acid sensitive from lag to stationary growth phase and the acid tolerance of cells reached its maximum level in late-stationary growth phase. The ATR induced at pH 5.5 and 5.0 was not affected by growth phase. Cellular protein profiles were analysed as a function of growth phase and medium pH. The Hemolysin BL (HBL) enterotoxin was only detected when cells were grown at pH 7.0.
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Affiliation(s)
- Michel-Philippe Jobin
- UMR A408 INRA/Université d'Avignon Sécurité et Qualité des Produits d'Origine Végétale, France
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