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Dissertations / Theses on the topic 'Microbial exopolysaccharides'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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1

Sukplang, Patamaporn. "Production and Characterization of a Novel Extracellular Polysaccharide Produced by Paenibacillus velaei, Sp. Nov." Thesis, University of North Texas, 2000. https://digital.library.unt.edu/ark:/67531/metadc2551/.

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Paenibacillus velaei, sp. nov. is a soil bacterium capable of producing an unusually large amount of exopolysaccharide (EPS). The EPS contains glucose, mannose, galactose and fucose in a molar ratio of 4:2:1:1. The molecular weight of the EPS is higher than 2x106. The viscosity of 1% EPS is 1300 cP when measured at a shear rate of 1 sec-1. Physiological parameters for optimal production of the EPS were studied and it was found that 1.4 g dry weight per 1 l of medium was produced when the bacteria were grown at 30EC and the pH adjusted at 7± 0.2 in a medium containing glucose as the carbon sour

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2

Sengha, S. S. "The physiology and energetics of alginic acid biosynthesis in Pseudomonas mendocina." Thesis, University of Hull, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377401.

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3

Livingston, Megan M., and n/a. "Stimulation of immune cells by heat-killed lactobacilli and exopolysaccharide." University of Otago. Department of Microbiology & Immunology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20090108.142107.

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Lactobacilli are intestinal bacteria with known immunomodulatory competence. Numerous strains of this genus have been implicated in both the prevention and treatment of intestinal inflammation as well as in maintenance of immunological homeostasis. The frequent inclusion of lactobacilli in probiotic products attests to this ability. These lactic acid bacteria colonise the murine forestomach and burgeon in other environments similarly rich in carbohydrate-containing substrates. Accordingly, lactobacilli may utilise fermentable carbohydrates to synthesise exopolysaccharides (EPS). These polymers

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4

Almeida, Jamille Pereira. "Triagem de isolados bacterianos de origem marinha visando a produção de exopolissacarídeos." Instituto de Ciências da Saúde, 2015. http://repositorio.ufba.br/ri/handle/ri/23435.

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Submitted by Programa de Pós-graduação em Biotecnologia (mebiotec.ufba@gmail.com) on 2017-04-06T13:04:01Z No. of bitstreams: 1 Dissertação Final - Jamille Almeida.pdf: 1302682 bytes, checksum: 996b2da859b03a0f196518660811cde6 (MD5)<br>Approved for entry into archive by Delba Rosa (delba@ufba.br) on 2017-06-29T15:06:56Z (GMT) No. of bitstreams: 1 Dissertação Final - Jamille Almeida.pdf: 1302682 bytes, checksum: 996b2da859b03a0f196518660811cde6 (MD5)<br>Made available in DSpace on 2017-06-29T15:06:56Z (GMT). No. of bitstreams: 1 Dissertação Final - Jamille Almeida.pdf: 1302682 bytes, checksum:

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5

Purwandari, Umi. "Physical properties of functional fermented milk produced with exopolysaccharide-producing strains of Streptococcus thermophilus." full-text, 2009. http://eprints.vu.edu.au/1965/1/Umi_Purwandari_thesis.pdf.

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This thesis focused on the study of the influence of different exopolysaccharide types produced by two strains of Streptococcus thermophilus on the physical properties of fermented milk. First, the fermentation factors affecting EPS production were studied to ascertain required carbon source and environmental conditions which would support their production. Higher fermentation temperature (42°C) resulted in a greater cell growth and EPS production. EPS production was growth associated in glucose or lactose-containing M17 medium. The examined strains appeared to be able to utilize galactose for

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6

Purwandari, Umi. "Physical properties of functional fermented milk produced with exopolysaccharide-producing strains of Streptococcus thermophilus." Thesis, full-text, 2009. https://vuir.vu.edu.au/1965/.

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This thesis focused on the study of the influence of different exopolysaccharide types produced by two strains of Streptococcus thermophilus on the physical properties of fermented milk. First, the fermentation factors affecting EPS production were studied to ascertain required carbon source and environmental conditions which would support their production. Higher fermentation temperature (42°C) resulted in a greater cell growth and EPS production. EPS production was growth associated in glucose or lactose-containing M17 medium. The examined strains appeared to be able to utilize galactose fo

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7

Santos, Sandra Isabel Almeida. "Emulsões estabilizadas pelo polissacárido microbiano FucoPol: produção e caracterização." Master's thesis, ISA, 2014. http://hdl.handle.net/10400.5/6985.

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Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia<br>The present work is focused on the production and characterization of oil in water emulsions stabilized with a bacterial exopolyssacharide (EPS), named FucoPol, produced by the bacterium Enterobacter A47 using glycerol as carbon source. The stabilizing ability of FucoPol was studied using aqueous biopolymer solutions with concentrations of 0.5%, 1.0% and 1.5% w/w, and sunflower oil, in ratios oil/water (O:W): 20:80, 40:60, 60:40 and 80:20. It was observed that the majority of the emulsions, except the proportions 80:20, sh

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8

Chen, Han-Chai. "Studies on the role of exopolysaccharides in Rhizobium infection of plants." Phd thesis, 1987. http://hdl.handle.net/1885/143175.

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9

Gray, James X. "Molecular analysis of exopolysaccharide genes of Rhizobium sp. strain NGR234." Phd thesis, 1990. http://hdl.handle.net/1885/143103.

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10

Parveen, Nikhat. "Genetics of exopolysaccharide synthesis in rhizobium species strain TAL1145 that nodulates tree legumes." Thesis, 1995. http://hdl.handle.net/10125/9996.

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11

Nichols, CAM. "Exopolysaccharide production by Antarctic marine bacteria." Thesis, 2005. https://eprints.utas.edu.au/21038/7/Nichols_whole_thesis_ex_pub_mat.pdf.

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Antarctic marine bacteria isolated from sea ice and Southern Ocean particulate material were screened for exopolysaccharide (EPS) production. Ten strains were characterized using phenotypic (morphology), chemotaxonomic (whole cell fatty acid profiles) and phylogenetic (16S rDNA sequencing) techniques. These isolates were representatives of four genera including Pseudoalteromonas, Shewanella, Polaribacter and Flavobacterium, with one strain constituting a new bacterial genus in the family Flavobacteriaceae. After further phenotypic characterisation, this strain was given the name Olleya marilim

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12

Dierksen, Karen P. "Regulation of exopolysaccharide synthesis." Thesis, 1996. http://hdl.handle.net/1957/34322.

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Lactococcus lactis subsp. cremoris Ropy 352 and L. lactis subsp. cremoris Hollandicus produce an exopolysaccharide (EPS) that imparts commercially desirable textural and rheological properties to fermented milk products. This ropy phenotype is expressed under specific environmental conditions. A mucoid EPS phenotype, also expressed under specific environmental conditions, but not involved in the fermentation of ropy milk was identified. The two EPS phenotypes can be expressed individually or concurrently. Genetic regulators involved in expression of the EPS phenotypes were sought. DNA probes a

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13

Knoshaug, Eric P. "Exopolysaccharide biosynthesis by a natural lactococcal ropy isolate." Thesis, 1998. http://hdl.handle.net/1957/33616.

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The genes coding for the expression of a ropy exopolysaccharide responsible for commercially desirable textural and rhealogical traits in fermented milk products by a natural lactococcal ropy isolate were sought. Using a transposon mutagenesis vector, pGh9:ISS1, three mutants lacking expression of the ropy exopolysaccharide were isolated. One of the mutants was chosen for further characterization. Using a Southern hybridization analysis, the interrupted gene was localized to the chromosome. The non-ropy mutant was further characterized and shown to be unable to produce ropy exopolysaccharide i

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14

Djordjevic, Steven P. "A chemical and genetic analysis of the role of Rhizobium exopolysaccharides in the infection of legume species." Phd thesis, 1987. http://hdl.handle.net/1885/143035.

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15

Ramchandran, Lata. "Physico-chemical and therapeutic properties of low-fat yogurt as influenced by fat replacers, exopolysaccharides and probiotics." 2009. http://eprints.vu.edu.au/15511.

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16

Ramchandran, Lata. "Physico-chemical and therapeutic properties of low-fat yogurt as influenced by fat replacers, exopolysaccharides and probiotics." Thesis, 2009. https://vuir.vu.edu.au/15511/.

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The general objective of this research was to develop a low-fat probiotic yogurt using fat replacers and EPS producing strains of Streptococcus thermophilus along with probiotics and to establish its antihypertensive property in vitro and in vivo. The specific aims of this project were: a) to select suitable strains of S. thermophilus and L. delbrueckii ssp. bulgaricus and of probiotics (L. casei, L. acidophilus and Bifidobacterium longum) based on their proteolytic, ACE-inhibitory and α-glucosidase inhibitory activities; b) to study the influence of a fibre-based fat replacer (Raftiline HP) a

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17

Amatayakul, Thanut. "The improvement of physical properties of yoghurts by varying casein/whey protein ratio and EPS-producing starter cultures." Thesis, 2005. https://vuir.vu.edu.au/15558/.

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The overall objective of this study was to investigate effects of variation in casein to whey protein ratios and types of exopolysaccharide producing starter cultures on physical properties of yoghurts made at 9% and 14% total solids during 28 days of storage at 4°C. There are three main parts of this research: a preliminary study, a comparative study of three methods for determination of syneresis and the studies on physical properties of yoghurts made with various casein to whey protein ratios using non-exopolysaccharide or exopolysaccharide-producing starter cultures.

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18

Meireles, Inês Trigo. "Development of exopolysaccharide membranes for dehydration processes." Doctoral thesis, 2018. http://hdl.handle.net/10362/34361.

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This PhD work proposes the use of two microbial exopolysaccharides, GalactoPol and FucoPol, for the development of membranes to be applied in relevant dehydration processes in industry. The starting material is obtained from a low cost, abundant carbon source, the glycerol produced as a by-product from the biodiesel industry, which represents a key economic advantage. A special attention was given to the development of membranes with enhanced mechanical and transport properties, and superior water selectivity for application in dehydration processes by pervaporation and vapour permeation. The

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19

Jiang, Ke. "Genomic and Molecular Analysis of the Exopolysaccharide Production in the Bacterium Thauera aminoaromatica MZ1T." 2011. http://trace.tennessee.edu/utk_graddiss/984.

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Thauera aminoaromatica MZ1T is an exopolysaccharide (EPS)-producing Gram negative bacterium isolated from the wastewater treatment plant of a major industrial chemical manufacturer as the causal agent for poor sludge dewatering. It shares common features with other known Thauera spp. (i.e. Thauera aromatica, and Thauera selenatis), being capable of degrading aromatic compounds anaerobically and using acetate and succinate as carbon sources. It is unique among the Thauera spp. in its production of abundant EPS which results in viscous bulking and poor sludge dewaterability. In this respect, it

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20

Ferreira, Ana Rita Vasques. "Design of microbial polysaccharide films for food packaging." Doctoral thesis, 2016. http://hdl.handle.net/10362/19886.

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The overuse of synthetic non-biodegradable plastic packaging in the last decades turned into a serious global environmental problem, once recycling and energy recovery are not perfect solutions. To overcome this problem, efforts have been done by researchers around the world to use biodegradable biopolymers from renewable resources as food packaging materials. In this thesis, FucoPol, a microbial exopolysaccharide has been studied as a sustainable alternative and the following questions were raised: • Is it possible to produce films of FucoPol and which properties should be improved? • Whic

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21

Lu, Rou-Ying, and 呂柔瑩. "Effect of oil, UV radiation and other environmental factors on the production and composition of marine microbial exopolysaccharide and wax ester." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/ja2t6b.

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碩士<br>國立臺灣海洋大學<br>海洋生物研究所<br>102<br>In this study, effect of UV and diesel oil on the production and composition of exopolysaccharides (EPS) and wax esters by the UV resistant oil degrading bacterium (Ochrobactrum tritice B32), yeast (Candida keelungensis SM22), and two microbial communities (UV12 and UV24) enriched from diesel oil were investigated. Effect of inoculum, medium composition (such as diesel oil concentration, carbon sources or nitrogen sources) and environmental factors (such as temperature, salinity, pH or UV radiation) on the yield and composition of the EPS were determined. Re

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22

D'Ascensão, João Diogo Mendes. "Study of kefiran production from cheese whey." Master's thesis, 2020. http://hdl.handle.net/10773/30416.

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Cheese whey is the main by-product of dairy industries, which is massively produced worldwide. Its disposal may represent a serious environmental issue due to its high organic content, therefore, it is of interest to find more solutions for its valorisation. An interesting approach is the conversion of its lactose into value-added products through microbial fermentation. Kefiran is an exopolysaccharide with approximately equal amounts of D-glucose and Dgalactose, whose remarkable properties make it possible to be of use in a wide range of applications in the medicine, pharmaceutical and

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