Bibliografie tematiche / Bacterial pigments

Letteratura scientifica selezionata sul tema "Bacterial pigments"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 29 gennaio 2023

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Articoli di riviste sul tema "Bacterial pigments"

1

Nawaz, Ali, Rida Chaudhary, Zinnia Shah, Laurent Dufossé, Mireille Fouillaud, Hamid Mukhtar e Ikram ul Haq. "An Overview on Industrial and Medical Applications of Bio-Pigments Synthesized by Marine Bacteria". Microorganisms 9, n. 1 (22 dicembre 2020): 11. http://dx.doi.org/10.3390/microorganisms9010011.

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Abstract (sommario):
Marine bacterial species contribute to a significant part of the oceanic population, which substantially produces biologically effectual moieties having various medical and industrial applications. The use of marine-derived bacterial pigments displays a snowballing effect in recent times, being natural, environmentally safe, and health beneficial compounds. Although isolating marine bacteria is a strenuous task, these are still a compelling subject for researchers, due to their promising avenues for numerous applications. Marine-derived bacterial pigments serve as valuable products in the food, pharmaceutical, textile, and cosmetic industries due to their beneficial attributes, including anticancer, antimicrobial, antioxidant, and cytotoxic activities. Biodegradability and higher environmental compatibility further strengthen the use of marine bio-pigments over artificially acquired colored molecules. Besides that, hazardous effects associated with the consumption of synthetic colors further substantiated the use of marine dyes as color additives in industries as well. This review sheds light on marine bacterial sources of pigmented compounds along with their industrial applicability and therapeutic insights based on the data available in the literature. It also encompasses the need for introducing bacterial bio-pigments in global pigment industry, highlighting their future potential, aiming to contribute to the worldwide economy.
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2

Sanchita Choubey, Sneha Vittal Chapade e Supriya Ashok Garud. "Optimization of Pigment Production by Micrococcus and Arthrobacter species Isolated from Soil and Water". International Journal of Research in Pharmaceutical Sciences 12, n. 3 (6 luglio 2021): 1902–7. http://dx.doi.org/10.26452/ijrps.v12i3.4791.

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Abstract (sommario):
A pigment is a substance that is substantially used in different industries that come in a wide range of coloration and few of which are soluble in water. Bacterial pigments have many applications in the modern day life. Some microorganisms have the characteristics feature to produce pigments which may additionally beneficial us in identification. Bacterial pigments have larger compatibility and greater biodegradability with the environment. Nontoxic nature of pigment produced with the aid of a huge range of microorganisms make them ecofriendly for use in foodstuff, dye, cosmetics, pharmacy and different industrial purposes. Pigments of bacteria provide various advantages compared to synthetic dyes. They are biodegradable in nature, easy to extract, easily available, cheaper substrates needed. The pigment produced by the bacteria can be used as anticancer agents, antibacterial agent and anti-proliferative agents. The object of the existing find out about was once to isolated pigment producing microorganism from water and soil samples and explores their properties. Based on their morphological and biochemical characteristics, they have been recognized as Micrococcus and Arthrobacter. The pigment isolated from bacterial spp. is used for the antimicrobial activity, anti-oxidant recreation and for optimization of pH, temperature and NaCl. It was once concluded that water and soil have various microorganisms and they have the capacity of producing pigments.
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Abfa, Iqna Kamila, Ocky Karna Radjasa, A. B. Susanto, Handung Nuryadi e Ferry F. Karwur. "Exploration, Isolation, and Identification of Carotenoid from Bacterial Symbiont of Sponge Callyspongia vaginalis". ILMU KELAUTAN: Indonesian Journal of Marine Sciences 22, n. 2 (6 giugno 2017): 49–58. http://dx.doi.org/10.14710/ik.ijms.22.2.49-58.

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Abstract (sommario):
During the past two decades research on marine bacteria has highlighted the tremendous potential of symbiotic-microorganisms as a source of bioactive secondary. One of the potential of the bacterial symbionts is producing a natural pigment, and these organisms can be used as a sustainable source of natural pigments. Carotenoid is one of the most important pigments that has important roles in physiological and molecular processes of microorganisms, as well as for human health. The objective of this study is to analyze carotenoid pigments from marine bacterial symbionts from sponge and to identify bacterial symbionts that produce carotenoid pigments. Pigment analysis was performed by a UV-VIS spectrophotometer and High Performance Liquid Chromatography (HPLC). Molecular bacterial identification was performed based on 16S rDNA sequence. The isolation of bacterial symbionts from C. vaginalison Zobell 2216E medium resulted in one bacterium, CB-SP5, positively synthesized carotenoids. By reverse phase HPLC analysis, the carotenoid pigments in the bacterial symbionts were identified as diadinoxanthin, fucoxanthin, neoxanthin, dinoxanthin, anddiadinochrome. CB-SP5 shared the highest level of 16S rDNA gene sequence similarity with Psychrobacter celer (99%). Keywords : carotenoid, sponge, bacterial symbiont, 16S rDNA.
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Murti, Damar Bayu, A. B. Susanto, Ocky Karna Radjasa e Ferdy Semuel Rondonuwu. "Pigments Characterization and Molecular Identification of Bacterial Symbionts of Brown Algae Padinasp. Collected from Karimunjawa Island". ILMU KELAUTAN: Indonesian Journal of Marine Sciences 21, n. 2 (1 giugno 2016): 58. http://dx.doi.org/10.14710/ik.ijms.21.2.58-64.

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Abstract (sommario):
The search for carotenoids in nature has been extensively studied because of their applications in foods. One treasure of the biopigment source is symbiotic-microorganisms with marine biota. The advantages of symbiont bacteria are easy to culture and sensitize pigments. The use of symbiont bacteria helps to conserve fish, coral reefs, seagrass, and seaweed. Therefore, the bacteria keeps their existence in their ecosystems. In this study, bacterial symbionts were successfully isolated from brown algae Padina sp. The bacterial symbionts had yellow pigment associated with carotenoids. The pigments were characterized using High Performance Liquid Chromatography (HPLC) with a Photo Diode Array (PDA) detector. The carotenoid pigments in the bacterial symbionts were identified as dinoxanthin, lutein and neoxanthin. Molecular identification by using a 16S rRNA gene sequence method, reveals that the bacterial symbionts were closely related to Bacillus marisflavi with a homology of 99%. Keywords :carotenoid pigments, brown algae, Padina, bacterial symbionts, 16S rRNA
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5

Afifah Mursyida Zaujan, Nur, Mohamad Zohdi Othman, Fatin Najihah Mohd Lutfi, Kamarul Rahim Kamarudin, Hanina Mohd Noor e Maryam Mohamed Rehan. "IDENTIFICATION AND CHARACTERIZATION OF PIGMENTED BACTERIA ISOLATED FROM MALAYSIAN SEAWATER". International Journal of Students' Research in Technology & Management 7, n. 4 (30 dicembre 2019): 01–08. http://dx.doi.org/10.18510/ijsrtm.2019.741.

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Abstract (sommario):
Purpose of study: Bacteria can naturally produce pigments that can be useful for various applications as they possess antimicrobial metabolites among other numerous benefits towards the human health. This study was carried out to identify the species of marine bacterial isolates PMA, PM3C1 and PM5C1 exhibiting yellow, orange and green colors respectively. Methodology: The current study is using Polymerase Chain Reaction (PCR) amplification and sequence analysis of their 16S rRNA gene. The stability of pigments extracted from the bacterial samples was also analyzed against different temperature and light conditions. Main Findings: Sequence alignment using BLAST revealed that the yellow, orange, and green-pigmented bacteria have 84% similarity with Staphylococcus aureus, 85% similarity with Exiguobacterium profundum and 95% similarity with Pseudomonas aeruginosa respectively. The green pigment showed major changes in color following exposure to sunlight and fluorescent light, and when incubated at 24°C and 50°C. Exposure to direct sunlight also results in the reduction of color for the yellow and orange extracts, while no effect was observed for both pigments under fluorescent light. Incubation at 50°C results in the reduction of the orange color, while the yellow pigment was observed to be unaffected suggesting its stability at high temperature. Implications: Natural pigments production can provide many advantages including reduction of pollution generation, ease of disposal and other benefits to the human health.
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Kanade, Yogini, Waman Mohan e Rajashree Patwardhan. "Violacein: A Promising Bacterial Secondary Metabolite". Research Journal of Chemistry and Environment 26, n. 6 (25 maggio 2022): 165–77. http://dx.doi.org/10.25303/2606rjce165177.

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Abstract (sommario):
Pigment is a secondary metabolite produced by microorganisms. As a natural product, bacterial pigments are being studied for their applications in pharmaceutical, food and cosmetic industry. Purple and blue bacterial pigments are less common. Violacein, a purple pigment is an indole derivative with molecular mass of 343.3. Some bacteria like Pseudoalteromonas sp. 520P1, Chromobacterium violaceum, Janthinobacterium lividum, Duganella violaceinigra, Collimonas and Iodobacter species are reported for violacein production. It is produced by vio operon comprising of vioABCDE genes. Violacein production is beneficial to the bacterial cell as it acts as a respiratory pigment involved in the regulation of tryptophan production, active in defensive mechanism and helps cell survival in stressed conditions. Carbon source, pH, temperature, incubation period and agitation rate are factors affecting violacein production. Violacein has shown antibacterial, antifungal, antiviral, anticancer and antiparasitic activity. It also displayed immunostimulatory, gastroprotective and antioxidant properties. Violacein gained industrial importance as a coloring agent in cosmetic, food and textile industries. This review intended to describe the violacein production by bacteria, its advantages to bacteria producing it, factors affecting its production and its applications.
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Pringgenies, Delianis, e Riyada Idris. "The antioxidant activity of carotenoid pigments in the bacterial symbionts of seagrass Syringodium isoetifolium". Indonesian Journal of Natural Pigments 1, n. 1 (14 febbraio 2019): 12. http://dx.doi.org/10.33479/ijnp.2019.01.1.12.

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Abstract (sommario):
Carotenoids are pigments of red, yellow and orange which are found in plants, animals and bacteria, and are known to have antioxidant activity. This study aims to identify the carotenoid pigments detected in seagrass Syringodium isoetifolium bacterial symbionts. Isolation of bacteria was conducted using dispersive media Zobell 2116E. Bacterial isolates were cultured and then centrifuged at 8000 rpm for 10 minutes and extracted using methanol. Identification of the pigment was done by using High Performance Liquid Chromatography (HPLC) reversed phase ODS / C18. The mobile phase was carried out using a mixture of methanol: acetonitrile (7: 3 v / v). Free radical reduction activities determined by the method of DPPH (diphenylpicrylhydrazil) and its absorbance was measured at a wavelength of 517 nm. Identification of the bacterial symbionts from the seagrass S. isoetifolium performed using 16S rDNA PCR method. The results showed that, of the 12 bacterial isolates obtained, isolate 7A was proven to contain caratenoid pigment. Pigment extracts of the bacterial isolates had free radical DPPH reduction activity of 40.4%. The results showed that the identification of bacteria isolates 7A had 100% level of kinship with the bacteria Bacillus amyloliquifaciens.
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Guo-Ping, Zhao, Li Ying-Qiu, Yang Jie e Cui Kai-Yu. "Antibacterial characteristics of orange pigment extracted from Monascus pigments against Escherichia coli". Czech Journal of Food Sciences 34, No. 3 (17 giugno 2016): 197–203. http://dx.doi.org/10.17221/430/2015-cjfs.

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Abstract (sommario):
The antibacterial characteristics of orange pigment, which is one of the Monascus pigments, against Escherichia coli were investigated. Orange pigment exhibited strong antibacterial activity against E. coli evidenced by an increase in the diameter of inhibition zone with orange pigment treatment. The concentration of 2.5 mg/ml was the minimum inhibitory concentration of orange pigment against E. coli. Scanning electron microscopy revealed that orange pigment could damage bacterial cells, eventually resulting in cell death. The increase in the electric conductivity of bacterial cell suspensions suggested that the cytoplasmic membrane was broken by treatment with orange pigment. The result of orange pigment incorporation into egg PC further demonstrated the interaction between orange pigment and the phospholipid led to the disruption of bacterial membrane.
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Mahadik, Chinmayee, Neha Manoti, Aafra Zuzar Mujawar, Meera Nambidas Konar, Peenal Arvind Mistry e Sejal Rathod. "IDENTIFICATION, CHARACTERIZATION OF CAROTENOID PIGMENT PRODUCING BACTERIA FROM VEGETABLE, FRUITS AND MINI-SURVEY ON PERCEPTION OF URBAN POPULATION TOWARDS BACTERIAL PIGMENTS". International Journal of Scientific & Engineering Research 12, n. 11 (25 novembre 2021): 538–60. http://dx.doi.org/10.14299/ijser.2021.11.04.

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Abstract (sommario):
Pigments are largely exploited compounds due to their chromophoric variations and enticing properties in several applications such as food, dairy, printing, textile and pharmaceutical industries etc. While synthetic pigments are widely used, toxic reactions and effects of the pigments has led to the prompt diversion of consumers towards natural pigment sources such as microbial pigments (MP). MP hold great promise against existent synthetic counterparts with additional properties such as biodegradability, non-toxicity, therapeutics (anti-inflammatory, antioxidant, anticancer etc.
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Rashid, Md. "Anti-Bacterial Activity of Pigments Isolated From Pigment-Forming Soil Bacteria". British Journal of Pharmaceutical Research 4, n. 8 (10 gennaio 2014): 880–94. http://dx.doi.org/10.9734/bjpr/2014/5148.

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Più fonti

Tesi sul tema "Bacterial pigments"

1

Lin, Ying-Chuan. "Production, Location, and Binding of Violacein in Janthinobacterium". Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc798326/.

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Abstract (sommario):
Violacein is a purple pigment typically produced by species of Chromobacterium and Janthinobacterium. A soil isolate, identified as as Janthinobacterium, was studied. Maximal pigmentation ocurred at 25°C under aerobic conditions in the Keeble and Cross medium.
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2

Abusada, Gabi M. (Gabi Michael). "Studies on the Mechanism of Protection by Carotenoids Against Photodynamic Killing in Curtobacterium Flaccumfaciens Pathover Poinsettiae". Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc332581/.

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The mechanism of protection by carotenoids against photodynamic killing in Curtobacterium flaccumfaciens pathover poinsettiae (C. poinsettiae) was studied using pigment mutants isolated by treatment with nitrosoguanidine and DNA gyrase inhibitors. Growth rates, pigment composition, pigment levels and the ultrastructure of the wild-type streptomycin resistant strain of G. poinsettiae (wt-str) and all mutants were compared. One mutant, NTG-1, lacked colored carotenoids, and another, NTG-2, was a slow growing mutant containing low levels (14%) of wild-type carotenoid pigments. Except for NTG-1, the other pigment mutants had different proportions of the same pigments found in the wild type as determined by high performance liquid chromatography (HPLC). Only NTG-2 was morphologically distinct at the ultrastructural level.
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3

Campbell, Alan L. (Alan Lee). "The Genetics of Pigmentation in Corynebacterium poinsettiae ATCC 9682". Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc330778/.

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Abstract (sommario):
Corynebacterium poinsettiae mutant strains blocked in carotenoid biosynthesis were obtained by treatment with the mutagen N-methyl-N1-nitro-N-nitrosoguanidine. Additional carotenoid (Crt) mutant strains were obtained from a previous study conducted in our laboratory. Fifty-nine Crt mutants affected in carotenoid biosynthesis were examined by a normal phase high performance liquid chromatography (HPLC) system. Pigment extracts of Crt mutants and C. poinsettiae wild type strains were resolved by an isocratic system with hexane:acetone:dicholoromethane, 11.35:1.73:1.00 (by vol.) as the eluting solvent. In addition to the five major peaks, twelve minor peaks were observed in the wild type C. poinsettiae strain used in this study. Crt mutant and wild type strain peak heights were measured from the individual chromatograms and the peak height data set created was analyzed using the Statistical Analysis System program to perform a cluster analysis. The cluster analysis revealed five carotenoid mutant groups. Carotenoid pigments which accumulated or were absent in each of the cluster groups are reported. Cluster group 1 mutants (CrtA) are blocked in the dehydrogenase(s) which is(are) responsible for the dehydrogenations between phytoene and lycopene. Cluster group 2 mutants (CrtB) appear to be blocked at a second dehydrogenase specific for the dehydrogenation from C.p. 470 to C.p. 496. Cluster group 3 mutants (CrtC) are blocked at a cyclization step in the pathway which involves cyclization of C.p. 496 to C.p. 470 and which may cyclize C.p. 473 to C.p. 450. The genes CrtA and CrtB map only 0.5 map units from each other while CrtA and CrtC map 2.1 map units from one another. Mutants which accumulate end products but which lack certain precursors indicate a branched pathway for pigment biosynthesis exists in this organism. Media for the formation, fusion and regeneration of C. poinsettiae protoplasts are reported and a protocol for the use of these media in genetic crosses of strains blocked in carotenoid biosynthesis is described. While isolating antibiotic resistant mutants useful in genetic analyses, novobiocin resistant mutants were observed to have a distinctly different colony pigment phenotype as compared to the wild type strain. HPLC chromatograms of a novobiocin resistant strain showed a distinctly different carotenoid pigment profile. The results provide evidence for differential gene expression in the carotenoid biosynthetic pathway when these mutants are grown in the presence of novobiocin.
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Egan, Suhelen Microbiology &amp Immunology UNSW. "Production and regulation of fouling inhibitory compounds by the marine bacterium Pseudoalteromonas tunicata". Awarded by:University of New South Wales. Microbiology and Immunology, 2001. http://handle.unsw.edu.au/1959.4/17838.

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Abstract (sommario):
The marine surface-associated bacterium Pseudoaltermonas tunicata, produces a range of compounds that inhibit fouling organisms, including invertebrate larvae, bacteria, algal spores and fungi. In addition to these antifouling compounds P. tunicata cells produce both a yellow and a purple pigment. The aim of this study was to further characterise the antifouling activities, their regulation and relationship with pigmentation, and the ecological significance of P. tunicata and related organisms. It was discovered that the anti-algal compound was extracellular, heat sensitive, polar and between 3 and 10 kDa in size. The anti-fungal compound was found to be the yellow pigment and active against a wide range of fungal and yeast isolates. Chemical analysis suggests that this compound consists of a carbon ring bound to a fatty-acid side chain. Genetic analysis supports the chemical data for the active compound as a mutant in a gene encoding for a long-chain fatty-acid CoA ligase was deficient for anti-fungal activity. To address the regulation of antifouling compounds and their relationship to pigmentation transposon mutagenesis of P. tunicata was performed. Mutants lacking the yellow pigment displayed a reduced ability to inhibit fouling organisms. Further analysis of these mutants identified genes involved with the synthesis and regulation of synthesis of pigment and antifouling compounds. One of these mutants was disrupted in a gene (wmpR) with similarity to the transcriptional regulators ToxR from Vibrio cholerae and CadC from Escherichia coli. Analysis of global protein expression using two-dimensional gel electrophoresis showed that WmpR is essential for the expression of at least fifteen proteins important for the synthesis of fouling inhibitors. The ecological significance of antifouling bacteria was addressed by assessing the antifouling capabilities of a collection of bacteria isolated from different marine surfaces. Overall, isolates from living surfaces displayed more antifouling traits then strains isolated from non-living surfaces. Five dark-pigmented strains originating from the alga Ulva lactuca were further studied. Phylogenetic and phenotypic analysis revealed that they were all members of the genus Pseudoalteromonas and were closely related to P. tunicata. Two strains represented a novel species within the genus and were taxonomically defined as P. ulvae sp. nov.
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Borrego, i. Moré Carles. "Heterogeneïtat pigmentària en bacteris fotosintètics verds: fisiologia i significació ecològica". Doctoral thesis, Universitat de Girona, 1996. http://hdl.handle.net/10803/96755.

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Abstract (sommario):
Green bacteria possess one of the most complexes antenna systems within the group of the photosynthetic microorganisms. One reason for this complexity is the high diversity of pigments antenna, the bacteriochlorophylls (BChls c, d or e), consisting of a mixture of various forms regularly arranged within the antenna units (the chlorosomes). This pigment diversity makes difficult the accurate analysis and identification of the different bacteriochlorophylls forms by the conventional spectrophotometrical techniques
Els bacteris verds posseeixen un dels sistemes antena més complexes dins el grup dels microorganismes fotosintètics. Una de les raons d’aquesta complexitat és l’elevada diversitat de pigments antena, especialment pel que fa a les bacterioclorofil•les (BCIs c, d o e). Cadascuna d’aquestes BCIs, que tenen diferents estructures i propietats òptiques, es composa d’una mescla de diverses formes homòlogues disposades ordenadament a l’interior de les unitats antena (clorosomes). Aquesta diversitat pigmentària dificulta enormement l’anàlisi i identificació d’aquests pigments mitjançant les tècniques espectrofotomètriques tradicionals
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6

Tanniou, Anaëlle. "Etude de la production de biomolécules d'intérêt (phlorotannins, pigments, lipides) d' algues brunes modèles par des approches combinées de profilage métabolique et d'écophysiologie". Thesis, Brest, 2014. http://www.theses.fr/2014BRES0055/document.

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Notre étude s’inscrit dans un processus de recherche de nouveaux composés d’origine naturelle à activités biologiques avérées à partir de macroalgues brunes, avec d’éventuelles perspectives d’exploitation industrielle. Ainsi, dans un premier volet nous avons testé des méthodologies innovantes en matière d‘extraction en utilisant trois espèces d’algues brunes comme modèles. Nous avons optimisé le protocole d’extraction solide/liquide en estimant divers paramètres cruciaux qui influent sur le rendement d’extraction et sur les activités antiradicalaires des composés extraits. Soucieux de trouver une méthodologie innovante d’extraction plus « verte » répondant aux normes européennes, nous avons donc testé des méthodes d’extraction utilisant des solvants dans leur état supercritique ou sous forme pressurisés. La comparaison avec le procédé d’extraction solide/liquide nous a permis de sélectionner l’extraction par fluides pressurisés (PLE) employée avec un mélange Ethanol-Eau pour l’extraction de composés antiradicalaires avec une haute efficacité. Dans une deuxième partie nous nous sommes intéressés aux variations quantitatives et qualitatives des principales macromolécules présentes chez l’espèce invasive Sargassum muticum en Europe. L’emploi de deux techniques analytiques, RMN HR-MAS et spectroscopie IR, nous a permis d’avoir une vue d’ensemble des compartiments susceptibles de subir des variations selon la position géographique d’une même espèce à large répartition. Cette étude nous a montré comment une espèce est capable de changer sa composition biochimique en fonction de son environnement et ainsi s’acclimater à des milieux assez différents. Ce travail a mis en évidence les effets de différents paramètres environnementaux sur les compartiments lipidique (analysés en GC), protéique ainsi que sur les quantités de carbohydrates et de pigments (analysés en HPLC). L’influence de ces paramètres sur la taille des individus de Sargassum muticum a également été discutée. La dernière partie de cette étude nous a permis de décrire les variations quantitatives et qualitatives des phlorotannins chez l’espèce invasive Sargassum muticum sur une grande échelle spatiale, le long d’un gradient latitudinal (Norvège-Portugal). Dans un premier temps cette variabilité a été appréhendée grâce à un suivi temporel et spatial des teneurs en phlorotannins. L’étude des variabilités intra-spécifiques et intra-individuelles nous a permis de mettre en évidence un effet du stade de développement et de la partie de l’algue considérée : les teneurs et activités des phlorotannins sont plus importantes dans les crampons et chez les individus matures. Après la recherche d’un protocole simple pour la semi-purification des composés phénoliques présent chez Sargassum muticum, nous avons pu mettre en évidence la présence de composés de type phlorethol au moyen de techniques de RMN à deux dimensions (2D). Ces fractions semi-purifiées possèdent des activités antiradicalaire et antibactérienne notoires. Enfin, l’utilisation de plusieurs techniques de séparation membranaires nous a permis d’estimer le poids moléculaire des différents composés présents dans le pool de composés phénoliques extrait. Enfin, suite aux constats effectués sur les populations, l’effet de l’intensité lumineuse et de la température de l’eau a pu être apprécié isolément : les radiations UVA et UVB boostent la production de CP alors qu’une augmentation de la température fait chuter la production de CP chez S. muticum
Our study is part of the research process for new compounds of natural origin with biological activities and possible industrial perspectives. In a first part, we tested innovative extraction methodologies using three brown algae species as model. We optimized the solid/liquid extraction protocol by estimating diverse crucial parameters which influence the extraction yield and radical scavenging activities of extracts. In order to find an innovative and more "green" extraction methodology answering the European standards, we thus tested more recent extraction methods using solvents in their supercritical state or under pressure. The comparison with the solid/liquid process allowed us to select pressurized liquid extraction (PLE) using an ethanol-water mixture for the extraction of active compounds with a high efficiency, but also to select Sargassum muticum as an interesting model for further investigations. In a second part, we were interested in the quantitative and qualitative variations of the main macromolecules present in the invasive species S. muticum in Europe. The employment of two analytical techniques (NMR HR-MAS and IR spectroscopy), allowed us to have an overview of biochemical parts of the algae, which vary according to the geographical position of this wide spread species. This study showed how a species is able to modify its biochemical composition, and then to acclimate, according to the environment. We then focused on molecules, which showed important variations along the latitudinal range of S. muticum. This work highlighted the effects of environmental parameters on lipid (GC analysis) and protein compartments as well as on carbohydrates and pigments quantities (HPLC analysis). The influence of these parameters on the size of individuals was also discussed. The last part of this study allowed us to describe the quantitative and qualitative variations of phlorotannins in S. muticum on a large spatial scale, along a latitudinal gradient (Norway-Portugal). At first this variability was measured thanks to temporal and spatial follow-up of the phlorotannins contents. The study of intra-specific and intra-individual variabilities allowed us to highlight an effect of the development stage and of the seaweed part: phlorotannins contents and activities are more important in holdfast and in mature individuals. After the research of a simple protocol for the phenolic compounds semi-purification present in Sargassum muticum, we were able to highlight the presence of compounds of only phlorethol type in this species by means of 2D RMN techniques. These semi-purified fractions possess notorious radical scavenging and antibacterial activities. Finally, the use of several membrane separation techniques allowed us to consider the molecular weight of the various compounds present in the extracted pool of phenolic compounds. Finally, under controlled conditions, the effects of the light quality and the seawater temperature were tested: UV-A and UV-B radiations boost the production of CP while an increase of the temperature makes the phlorotannins production decreasing in S. muticum
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Omer, Zahra Saad. "Bacterial-plant associations with special focus on pink-pigmented facultative mehtylotrophic bacteria (PPFMs) /". Uppsala : Dept. of Plant Pathology and Biocontrol Unit, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a456-ab.html.

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8

Torres, Ane Pamela Capucci [UNESP]. "Biomassa bacteriana como aditivo de ração de aves e peixes". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/94595.

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Rubrivivax gelatinosus é uma bactéria fototrófica natural de ambientes aquáticos que apresenta a capacidade de crescer em substratos contendo diversos compostos orgânicos. Neste trabalho, a biomassa da bactéria, produzida em águas residuárias provenientes de abate e processamento de pescado, foi caracterizada em relação a cor, composição centesimal, composição microbiológica e conteúdo de pigmentos carotenóides e aminoácidos, visando avaliar seu potencial como ingrediente para ração animal. Os resultados encontrados apontaram valores médios de 57% de proteína bruta, 23% de extrativo não nitrogenado e contaminantes, 11% de extrato etéreo, 5% de umidade e 4% de matéria mineral. Vários aminoácidos considerados essenciais para diversas espécies animais foram detectados no produto, tais como metionina (0,66g/100g), lisina (4,52g/100g), fenilalanina (3,43g/100g) e valina (4,39g/100g). Os resultados das análises microbiológicas indicaram contagens médias de 5,3 x 106 UFC/g para bactérias mesófilas aeróbias e facultativas viáveis, 20,27 NMP/g para coliformes a 35°C, <1,0 NMP/g para coliformes a 45°C e 1,2 x 103 UFC/g para bolores e leveduras. Não foram encontrados Aeromonas spp., Salmonella spp. e estafilococos coagulase positivo. O resultado da análise objetiva da cor da biomassa indicou valores médios de 25,48 para tonalidade, 14,22 para saturação da cor e 22,42 para luminosidade. A concentração média de carotenóides foi de 3,03 mg/g de biomassa. A determinação da composição e das características sensoriais da biomassa de Rubrivivax gelatinosus indicaram baixo nível de contaminação microbiana e alto potencial nutricional e pigmentante, apontando positivamente para sua utilização como ingrediente de rações na criação de animais
Rubrivivax gelatinosus is a photoautotrophic bacterium that inhabits aquatic environment in which it uses different organic substrates for growth. In this work, the biomass of the bacterium, grown in effluent from fish slaughter and processing industry was characterized for color, proximate composition, microbiological composition, carotenoids and amino acids contents, with the aim of evaluating its potential as a feed ingredient. Mean results showed 57% crude protein, 23% non nitrogen extract and contaminants, 11% ether extract, 5% moisture and 4% ashes. Many amino acids considered essential for different animal species were present in the product, like metionine (0.66g/100g), lysine (4.52g/100g), phenylalanine (3.43g/100g) and valine (4.39g/100g). Microbial analysis showed mean counts of 5.3 x 106 UFC/g for mesophilic bacteria, 20.27 NMP/g for coliforms at 35°C, <1.0 NMP/g for coliforms at 45°C and 1.2 x 103 UFC/g for yeasts and moulds. Aeromonas spp., Salmonella spp. and positive coagulase staphylococci were not detected in the product. Results from objective color evaluation showed means at 25.48 for hue, 14.22 for chroma and 22.42 for lightness. Mean carotenoids concentration detected was 3.03 mg/g biomass. The determination of composition and sensorial characteristics of Rubrivivax gelatinosus biomass indicated low contamination level and high nutritional and pigmenting potential, pointing out for a positive use of the product as an ingredient for animal feeds
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Sarcina, Maria. "Pigment-protein interactions within photosystem II". Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313030.

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Fraser, Niall Johnston. "Modified pigments and mechanisms of energy transfer in LH2 complexes from purple bacteria". Thesis, University of Glasgow, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301678.

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Libri sul tema "Bacterial pigments"

1

Ahmad, Wan Azlina, Wan Yunus Wan Ahmad, Zainul Akmar Zakaria e Nur Zulaikha Yusof. Application of Bacterial Pigments as Colorant. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24520-6.

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Bernhard, Grimm, a cura di. Chlorophylls and bacteriochlorophylls: Biochemistry, biophysics, functions and applications. Dordrecht: Springer, 2006.

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1942-, Breton Jacques, Vermeglio André e North Atlantic Treaty Organization. Scientific Affairs Division., a cura di. The photosynthetic bacterial reaction center: Structure and dynamics. New York: Plenum Press, 1988.

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E, Michel-Beyerle M., a cura di. Antennas and reaction centers of photosynthetic bacteria: Structure, interactions, and dynamics : proceedings of an international workshop, Feldafing, Bavaria, F.R.G., March 23-25, 1985. Berlin: Springer-Verlag, 1985.

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Romanovich, Ivanit͡s︡kiĭ Genrikh, a cura di. Biopigmenty--fotoregistratory: Fotomaterial na bakteriorodopsine. Moskva: "Nauka", 1988.

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Michel-Beyerle, Maria Elisabeth. Antennas and Reaction Centers of Photosynthetic Bacteria: Structure, Interactions and Dynamics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985.

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Dijk, Bastiaan van. Magnetic and electric field effects in photosynthetic pigment-protein complexes. Leiden: University of Leiden, 1998.

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(Editor), Bernhard Grimm, Robert J. Porra (Editor), Wolfhart Rüdiger (Editor) e Hugo Scheer (Editor), a cura di. Chlorophylls and Bacteriochlorophylls (Advances in Photosynthesis and Respiration). Springer, 2006.

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Bernhard, Grimm, a cura di. Chlorophylls and bacteriochlorophylls: Biochemistry, biophysics, functions and applications. Dordrecht: Springer, 2006.

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Porra, Robert J., Wolfhart Rüdiger, Hugo Scheer e Bernhard Grimm. Chlorophylls and Bacteriochlorophylls: Biochemistry, Biophysics, Functions and Applications. Springer Netherlands, 2010.

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Capitoli di libri sul tema "Bacterial pigments"

1

Ahmad, Wan Azlina, Wan Yunus Wan Ahmad, Zainul Akmar Zakaria e Nur Zulaikha Yusof. "Application of Bacterial Pigments as Colorant". In SpringerBriefs in Molecular Science, 57–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24520-6_4.

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Breton, J. "Low Temperature Linear Dichroism Study of the Orientation of the Pigments in Reduced and Oxidized Reaction Centers of Rps. viridis and Rb. sphaeroides". In The Photosynthetic Bacterial Reaction Center, 59–69. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0815-5_9.

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Mäntele, Werner, Monika Leonhard, Michael Bauscher, Eliane Nabedryk, Gerard Berger e Jacques Breton. "The Binding and Interaction of Pigments and Quinones in Bacterial Reaction Centers Studied by Infrared Spectroscopy". In Molecular Biology of Membrane-Bound Complexes in Phototrophic Bacteria, 313–21. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-0893-6_37.

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Mäntele, W., R. Hienerwadel, M. Bauscher, M. Leonhard, D. A. Moss, E. Nabedryk, D. Thibodeau e J. Breton. "Infrared Difference Spectroscopy of Pigments and Redox Components in the Bacterial Reaction Center: Comparison with Model Compounds". In Current Research in Photosynthesis, 85–88. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0511-5_15.

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Ahmad, Wan Azlina, Wan Yunus Wan Ahmad, Zainul Akmar Zakaria e Nur Zulaikha Yusof. "Isolation of Pigment-Producing Bacteria and Characterization of the Extracted Pigments". In SpringerBriefs in Molecular Science, 25–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24520-6_2.

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Mazzoli, Roberto, e Enrica Pessione. "Ancient Textile Deterioration and Restoration: Bio-Cleaning of an Egyptian Shroud Held in the Torino Museum". In Microorganisms in the Deterioration and Preservation of Cultural Heritage, 199–216. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69411-1_9.

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AbstractAncient textiles are fragile and several factors can affect their integrity. In the present chapter, the main agents of deterioration of old and new textiles, namely physical-chemical (light, oxygen, heat, and humidity) and biological factors as well as human erroneous interventions will be explored. As far as the biological deterioration is considered, the effects of microbial growth, primary and secondary metabolites (acids, solvents, surfactants, pigments) and enzymes (lipases, proteases, and glycosidases) on textile strength and cleanliness will be described in details. The main fungal and bacterial species involved in the damage (textile discoloration, black and green spots, cuts) will be reported. Adhesive application during restoration procedures is discussed to highlight the risk of glue thickening giving rise to dull precipitates on the fabric.The main strategies for oil-stain and glue removal (both animal glue, such as fish collagen, and vegetal glue, i.e. starch) will be described in the paragraph devoted to biorestoration. Finally, a case study concerning an ancient Coptic tunic housed in the Egyptian Museum of Torino, Italy, and biocleaned by means of gellan-immobilized alpha-amylase from Bacillus sp. will be largely discussed by reporting historical data, adhesive characterization, methods for artificial aging of simulated sample and glue removal from the artwork.
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Veraldi, Stefano, Luisa Carlotta Rossi e Emilio Berti. "Bacterial Infections". In Pigmented Ethnic Skin and Imported Dermatoses, 29–35. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-69422-1_4.

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Perry, K. L., T. Simonitch, K. Harrison-Lavoie e S. T. Liu. "Cloning Regulation and Expression of Yellow Pigment Genes from Erwinia Herbicola". In Plant Pathogenic Bacteria, 477. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3555-6_100.

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Mäntele, W., K. Steck, A. Becker, T. Wacker, W. Welte, N. Gad’on e G. Drews. "Spectroscopic Studies of Crystallized Pigment-protein Complexes of R. Palustris". In The Photosynthetic Bacterial Reaction Center, 33–39. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0815-5_6.

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Pearlstein, Robert M. "Modified-CI Model of Protein-induced Red Shifts of Reaction Center Pigment Spectra". In The Photosynthetic Bacterial Reaction Center, 331–39. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0815-5_33.

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Atti di convegni sul tema "Bacterial pigments"

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Shahzad, Mariyam. "Development of Fabric Dye Using Bacterial Pigments". In INTERNATIONAL CONFERENCE ON BIOLOGICAL RESEARCH AND APPLIED SCIENCE. Jinnah University for Women, Karachi,Pakistan, 2022. http://dx.doi.org/10.37962/ibras/2022/6-7.

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The wastes from industries which produce textile dyes using toxic chemicals and processes pose serious threats to the environment that are often very difficult to treat and dispose. Certainly, there is a need of environment conservation, and more research should be done in order to save it. Therefore, the prime focus of this study is producing microbial dyes as advanced alternative to make dyes from pigments naturally produced by non-pathogenic bacteria which contain carotenoids and astaxanthin.
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"Isolation of pigment producing Bacteria and characterization of extracted pigment". In International Conference on Medicine, Public Health and Biological Sciences. CASRP Publishing Company, Ltd. Uk, 2016. http://dx.doi.org/10.18869/mphbs.2016.144.

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Wadday, Ali Kadhim, Zeyad A. Saleh e Mohammed Fraj Al-Marjani. "Spectroscopic characteristics and energy transfer of bacterial pigment: (pyocyanin/curcumin)". In SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5141438.

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Lyakhovchenko, N. S., V. Yu Senchenkov, D. A. Myagkov, D. A. Pribylov, A. A. Chepurina, I. A. Nikishin, A. A. Avakova et al. "Determination of the taxonomic affiliation of the native isolate of the pigment-forming bacterium, separated from the Vezelka river of the city of Belgorod". In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.157.

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The paper presents the results of a study of an aboriginal isolate of a pigment-forming bacterium isolated from the Vezelka River in the city of Belgorod, which makes it possible to determine its taxonomic affiliation.
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Kryzhko, A. V., L. N. Kuznetsova e A. V. Shirma. "Promising entomopathogenic strain of Bacillus thuringiensis 0428 effective against the Colorado beetle". In РАЦИОНАЛЬНОЕ ИСПОЛЬЗОВАНИЕ ПРИРОДНЫХ РЕСУРСОВ В АГРОЦЕНОЗАХ. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-15.05.2020.14.

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Most of the world produced biopesticides are made by entomopathogenic bacteria B. thuringiensis. So, searching for new strains of it is always necessary. In 2006, the strain B. thuringiensis 0428 was isolated from the caterpillar of the ringed silkworm. The strain 0428 is entomopathogenic against Colorado beetle larvae. The effectiveness of the strain for 5 days was 100%. On beef-extract agar this Gram-positive bacterium formed round or irregular colonies with an average diameter of 6-10 mm. The relief of the colonies is flat; the surface is matte. Colonies of B. thuringiensis 0428 are fast-growing, appearing on the surface of the beef-extract agar on the second or third day at 26-30ºC. The average cell size is 6.48±0.16 (large diameter) and 2.62±0.06 (small diameter) microns. The study of the physiological and biochemical properties of the isolated strain shown that B. thuringiensis 0428 is able to form acetyl-methyl-carbinol and lecithinase. B. thuringiensis 0428 is not able to form ureases or pigments, as well as to use citrates and galactose. But it is able to use sucrose, glucose, mannose, and salicin as a source of carbon. The strain 0428 has proteolytic activity. The strain is capable of synthesizing an insecticidal crystalline protein Cry1A and β-exotoxin. All these characteristics allow us to identify the isolated entomopathogenic strain 0428 as B. thuringiensis var. thuringiensis.
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A., Shaima, Gires U. e Asmat A. "Isolation and characterization of pigmented algicidal bacteria from seawater". In THE 2014 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2014 Postgraduate Colloquium. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4895253.

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Hanina, M. N., A. Siti Nabilah, M. R. Maryam e M. R. Salina. "Morphological and biochemical characterization of pigment producing bacteria isolated from squid and Lala". In GREEN DESIGN AND MANUFACTURE: ADVANCED AND EMERGING APPLICATIONS: Proceedings of the 4th International Conference on Green Design and Manufacture 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5066874.

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Yang, Fei, Xiaoqing Li, Geyu Liang, Xiang Zhou, Jun Yuan, Lihong Yin e Yuepu Pu. "Identification and Algae-Lytic Characteristics of a Pigment-Generating Bacterium Isolated from Lake TaiHu". In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5517711.

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Carvalho, Cristina, Gianni Montagna, Carla Costa Pereira e Carlos Manuel Figueiredo. "Biodyes: A new solution for textile dyeing technology". In 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1001548.

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The Textile Industry is one of the most representative industries in the world's industrial structure and has always assumed an important role in the national economy. Globally, and according to a study by Grand View Research, this industry represented 961.5 billion dollars in 2019 (Grand View Research - Global textile market 2020-2027).However, this sector represents the second most polluting industry in the world, and the environmental impacts occur, above all, in terms of water consumption, soil erosion, CO2 emissions and the resulting residues.The textile industry is responsible for the production of 2.1 billion tons of waste, most of which are discarded into the water ecosystem, essentially during the dyeing processes. In fact, dyeing is one of the most polluting processes in the textile industry, representing a high source of pollution of water circuits and environmental ecosystem. According to the World Bank, textile dyeing industries are responsible for 20% of industrial water pollution.This reality acquires even greater proportion when analyzing the quantities of dyes produced. Every year, it is estimated that around 10,000 types of dyes and pigments, and 7x105 tons of synthetic dyes are produced in the market, for this sector. From this production, more than 200,000 tons of dyes are released into industrial effluents during the textile processing phases (dyeing and finishing).To reduce the environmental footprint caused by the textile industry, the replacement of synthetic dyes by others from natural compounds has been the subject of extensive research, through the development of new ways of coloring textile materials.One of the emerging research areas is related to the exploration of obtaining natural dyes, from microorganisms, called Biodyes.The research aims to develop a sustainable dyeing process, through the production of biodyes, from the metabolic study of the production of microorganisms.It is known the potential that exists in the generation of color and a wide spectrum of functionalities, from biotechnology, regarding the metabolic pathway of certain microorganisms, in the specific case from bacteria such as E. Coli. The main advantages of the innovation proposed in the investigation of this research work are compared to synthetic dyes/pigments, its very low environmental impact, in terms of consumption of material and energy resources, environmental pollution and non-toxicity of the resulting effluents. At the same time, the production of dyes from microorganisms, bacteria and/or fungi, has benefits compared to natural alternatives of plant origin due to its independence from seasonal limitations and climatic conditions, as well as the rapid growth of some substances and therefore with much higher biological yields and consequent industrial application.
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Paret, Mathews L., Shiv K. Sharma, Anupam K. Misra, Tayro Acosta, Asoka S. deSilva, Tomie Vowell e Anne M. Alvarez. "Characterization of the pigment xanthomonadin in the bacterial genus <i>Xanthomonas</i> using micro- and resonance Raman spectroscopy". In SPIE Defense, Security, and Sensing. SPIE, 2012. http://dx.doi.org/10.1117/12.919652.

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