responses of lactic acid bacteria towards specific environmental stresses

... regulate the mucosal immune responses upon a variety of stimuli, including lactic acid bacteria (LAB) LAB are a group of related bacteria that produce lactic acid as a result of carbohydrate fermentation ... THE ROLES OF LACTIC ACID BACTERIA IN HOST INFLAMMATORY RESPONSES WANG SHUGUI (B.Sc., Sun Yat-Sen University) A THESIS SUBMITTED FOR THE DEGREE OF PHILOSOPHY OF DOCTORATE DEPARTMENT OF MICROBIOLOGY ... bacteria that produce lactic acid as a result of carbohydrate fermentation The production of lactic acid results a very low pH which is low enough to inhibit the growth of most other microorganisms...

Ngày tải lên: 13/09/2015, 19:50

... buffering capacity of the medium are known The amount of undissociated lactic acid is then further related to the total amount of lactic acid LaHtot and the pH by the lactic acid chemical equilibrium ... concentrations of undissociated lactic acid [LaH] and hydrogen ions [H + ], originating from the lactic acid produced by the micro-organism Transition of the exponential growth phase towards the ... lactic acid present in a surface liquid layer with known dimensions, the adapted model describes the concentrations of cells and lactic acid in a liquid medium Microbial growth and lactic acid...

Ngày tải lên: 05/05/2014, 08:44

... Effect of bile acid on the cell membrane functionality of lactic acid bacteria for oral administration Res Microbiol 157:720–725 doi: 10.1016/j.resmic.2006.04.002 Thongsom M (2004) Lactic acid bacteria ... Poult Sci 5:593–597 Ammor S, Tauveron G, Dofour E, Chevallier I (2006) Antibacterial activity of lactic acid bacteria against spoilage and pathogenic bacteria isolated from the same meat small-scale ... are evaluated as beneficial bacteria by their product of acids (lactic acid) , bacteriocin or bacteriocin-like substances Putrefactive bacteria are regarded as harmful bacteria in that they decompose...

Ngày tải lên: 07/07/2014, 19:20

... Isolation of cholesterol-lowering lactic acid bacteria 393 Table Number of acid- and bile-tolerant lactic acid bacteria isolated from the human intestine for probiotic use Acida Bileb BSHc Streptococcus ... Woestyne M, Christiaens H, Verstraete W Significance of bile-salt hydrolytic Isolation of cholesterol-lowering lactic acid bacteria activities of lactobacilli J Appl Bacteriol 1995, 79, 292-301 ... agar plate Bacteria were preprocessed with reagents to extract fatty acid from the bacterial cell-wall and identified with microbial identification system (MIDI, Inc., USA) Isolation of bacteria: ...

Ngày tải lên: 07/08/2014, 18:20

... Holzapfel WH: Lactic acid bacteria of foods and their current taxonomy International Journal of Food Microbiology 1997, 36:1-29 Ouwehand AC, Salminen S, Isolauri E: Probiotics: an overview of beneficial ... parameters were followed as described Evaluation of peripheral white blood cell counts At the end of the prophylactic protocol of mouse ACD, the blood of each mouse was taken and white blood cell ... diminution of PMN extravasation in the ear of mice The diminution of neutrophils extravasation as suggested by blood PMN counts was confirmed by the reduction of neutrophil content in ear of 62.4%...

Ngày tải lên: 11/08/2014, 08:21

... value of fruit juice fermented by lactic acid bacteria (LAB) Four isolates of lactic acid bacteria from mango were obtained The results of research showed that all 10 strains of lactic acid bacteria ... hours Count density of lactic acid bacteria: plate counting method Monitor the indicators: Brix, pH, level of lactic acid after fermentation and the density of lactic acid bacteria Analyze the ... survive and grow at this pH The cause of the decrease in pH was due to the development of lactic acid bacteria that produced lactic acid Content of lactic acid produced from isolates from Ybio...

Ngày tải lên: 06/10/2015, 12:57

... select lactic acid bacteria and to study the favorable conditions of lactic acid fermented carrot juice with biological values The content of this study includes: - Isolation of lactic acid bacteria ... Isolation of lactic acid bacteria 3.2 Study on low pH tolerance of isolates 3.3 Study on lactic acid fermentation ability of isolates in carrot juice 10 3.4 Identification of the ... tolerance of isolates - Study on lactic acid fermentation ability of isolates in carrot juice - Identification of the selected lactic acid bacteria by molecular technique - Study on the effect of dilution...

Ngày tải lên: 06/10/2015, 13:04

... organic acids,… Dragon fruit juice is a suitable medium for lactic acid bacteria to produce new probiotic products Therefore, the study “Fermentation of dragon fruit juice by lactic acid bacteria ... hours of fermentation, pH decreased from 4.52 to about 3.23 – 4.31 At this pH, lactic acid bacteria could remain The pH decreased because due to the production of lactic acid during development of ... Characteristics of isolated bacteria strains: - Bacteria strains isolated from Antibio and Probio powder were rod-shaped bacteria They had the same characteristics of Lactobacillus acidophilus, the bacteria...

Ngày tải lên: 06/10/2015, 13:04

... for lactic acid bacteria to produce new probiotic products Therefore, the research “Fermentation of pineapple juice by lactic acid bacteria was carried out Objectives To isolate lactic acid ... into lactic acid inhibited the bacterial growth and development Besides, lactic acid itself could inhibit the development of bacteria (Nguyen Thi Hien, 2006) In contrast, the treatment of 15 9% of ... characteristics, four isolated bacteria were lactic acid bacteria with following characteristics such as: gram-positive bacteria, catalase-negative, reducing lactic acid to dissolution of CaCO3, cocci or...

Ngày tải lên: 06/10/2015, 13:05

... of lactic acid 1.3 Production of lactic acid 1.3.1 Chemical synthesis 1.3.2 Fermentation 1.3.3 Lactic acid microorganisms 1.3.3.1 Lactic acid bacteria 1.3.4 Metabolic pathways of lactic acid bacteria ... 11.0 30 1.3.3.1 Lactic acid bacteria Lactic acid bacteria (LAB) are a group of related bacteria that produce lactic acid as major product.31 LAB have the property of producing lactic acid from carbohydrates ... stereochemistry of PLA is complex because of the chiral nature of lactic acid monomers There are types of PLAs namely PLLA poly (levo -lactic acid) , PDLA poly (dextro -lactic acid) and PDLLA 18 poly (D,L-lactic...

Ngày tải lên: 16/10/2015, 11:57

... in Fig The natural pH of 1.96 × 10−4 M benzoic acid was 3.7 Solution of benzoic acid at pH 2.0 was prepared by adding required amounts of 0.1 M HCl and solutions of benzoic acid at pH 5.3, 9.1, ... / Journal of Colloid and Interface Science 284 (2005) 83–88 The aim of the present study is to determine the kinetics and equilibrium states of adsorption of benzoic acid onto high specific surface ... intervals of over a period of 125 Absorbance data were converted into concentration data using calibration relations predetermined at the wavelength of interest for the corresponding pH of benzoic acid...

Ngày tải lên: 01/12/2016, 16:24

... of One hundred and thirteen lactic acid bacteria isolates were obtained from seven fermented 742 World Appl Sci J., (5): 741-747, 2008 Table 1: Species and frequency of occurrence of lactic acid ... containing 90 ml of mESM broth and incubated at 30°C for 30h Samples were taken for analysis at the end of the fermentation period Isolation of lactic acid bacteria: Serial dilutions of homogenized ... on the occurrence of lactic acid bacteria spectrum, L plantarum constituted the highest number of LAB isolated from fermented plant materials The involvement of various types of LAB in fermented...

Ngày tải lên: 16/09/2012, 23:45

... Poly (lactic acid) fabric Figure Effect of time of heatsetting on the linearity of load extension in weft direction of knitted Ingeo™ Poly (lactic acid) Figure Mean effect of time of heatsetting ... [PLA] Figure Mean [Ā] of effect of time of heatsetting on the tensile extension EM [%] of Ingeo™ Poly (lactic acid) 3.2 Linearity of load extension curve LT [-] The linearity of load extension curve ... Ingeo Poly (lactic acid) (PLA) fabric Conclusion The effect of time of heatsetting on tensile properties of knitted Ingeo™ Poly (lactic acid) (PLA) was determined using the KES-FB system of fabric...

Ngày tải lên: 05/09/2013, 16:10

... Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China 2Department of Botany and ... absence of ABA, 100% of wild-type seeds and more than 85% of WRKY18-overexpressing plants germinated (Figure 1A) In the presence of 0.5 and 1.0 μM ABA, however, the germination rates of WRKY18overexpressing ... SA [27] Because of their role in plant response to ABA and abiotic stresses, we performed quantitative RT-PCR to analyze the effects of ABA and abiotic stresses on expression of these three WRKY...

Ngày tải lên: 11/08/2014, 11:21

... ENGINEERED POLY(L -LACTIC ACID) -BASED NANOFIBERS FOR OSTEOGENIC DIFFERENTIATION OF HUMAN MESENCHYMAL STEM CELLS NGUYEN THI HIEN LUONG (B.Eng., Ho Chi Minh city University of Technology, Vietnam) ... Seeram Ramakrishna Electrospun Poly(L -lactic acid) Nanofibres Loaded with Dexamethasone to Induce Osteogenic Differentiation of Human Mesenchymal Stem Cells Journal of Biomaterials Science, Polymer ... Poly-L -lactic acid nanofibers for bone graft materials Proceedings of International Conference for Micro & Nanotechnologies for Biosciences, 16 18/11/2009, Switzerland Poster presentation iv Table of...

Ngày tải lên: 09/09/2015, 10:07

... organization 1.1 Overview of Poly (lactic acid) Poly (lactic acid) or Poly(lactide) (PLA) is a synthetic biopolymer of lactic acid, which can be derived by bacterial fermentation of carbohydrates from ... 152 IV List of Abbreviations List of Abbreviations PLA polylactic acid or polylactide sc stereocomplex PLLA poly(L -lactic acid) or poly(L-lactide) PDLA poly(D -lactic acid) or poly(D-lactide) ... their 50/50 blends XV List of Figures List of Figures Figure 1.1 Two enantiomeric forms of lactic acid: (S)- and (R)- 2-hydroxypropionic acid Figure 1.2 Three stereoisomers of lactide which lead to...

Ngày tải lên: 09/09/2015, 18:56

... Hybridization and Detection of Nucleic Acids 1.1.1 Basic of nucleic acid hybridization The nucleic acid is a polymer consists of monomers called nucleotides Each nucleotide composes of a nitrogenous base, ... 2.7 Effect of blocking in the hybridization of × 10 M of target (gray bars) and negative control samples (white bars) using CNT-based labels 93 Figure 2.8 The effects of specificity of bead conjugates ... and the efforts towards improving the sensitivity and specificity of assays with an emphasis on the electrochemical nucleic acids detection 1.1.2 Label-free detection of nucleic acids There are...

Ngày tải lên: 12/09/2015, 09:28

... of ethanol and produce high levels of acetic acid Carr media with 4%, 5%, 6%, 7%, 8%, 9% and 10% ethanol were used [4] Characterization and biochemical tests: After isolation of acetic acid bacteria ... Ribereau-Gayon, “Evolution of acetic acid bacteria during fermentation and storage of wine,” Appl Environ Microbiol., vol 48, 1984, pp.153-156 [2] G S Drydale and G H Fleet, “Acetic acid bacteria in som ... to produce acetic acid increasingly (Table I and Table II) Isolation of bacterial strain: For isolating bacterial strains that were responsible for vinegar smelling, 20 ml of Iranian white-red...

Ngày tải lên: 16/09/2012, 23:41

... kh o [1] J B Brian, Wood, The Lactic Acid Bacteria, The Lactic Acid Bacteria in Health and Disease [2] A.F Harper, E.T Kornegay, K.L Bryant, H R Thomas, “Efficacy of virginiamycin and a commercialy-available ... Stanlet, “Comparison of two strains of Lactobacillus acidophilus as dietary adjuncts for young calves”, J Dairy Sci 63 (1980) 964 Study on characteristics of lactic acid bacteria isolated in ... Department of Biology, College of Science, VNU, 334 Nguyen Trai, Hanoi, Vietnam Department of Microbiology, National Institute of Nutrition, Yersin, Hanoi, Vietnam - Out of 50 isolated lactic bacteria...

Ngày tải lên: 16/09/2012, 23:41

... abundance ratio of the microcystin-degrading bacteria increased to approximately 0.005% of the total bacteria The number of cells increased in fall, and the number of microcystin-degrading bacteria ... further investigation of the dynamics of the bacteria in lakes with cyanobacteria is required CONCLUSION We successfully quantified the microcystin-degrading bacteria in a biofilm from a practical ... the mechanism of the degradation of microcystin Further studies, like the degradation of microcystins by bacteria without mlrA gene or analysis of the relationship between cyanobacteria and microcystin-degrading...

Ngày tải lên: 05/09/2013, 10:15