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https://www.readbyqxmd.com/read/29146345/effect-of-high-pressure-processing-on-colour-phytochemical-contents-and-antioxidant-activities-of-purple-waxy-corn-zea-mays-l-var-ceratina-kernels
#1
Kawinchaya Saikaew, Kamol Lertrat, Mutita Meenune, Ratchada Tangwongchai
High-pressure processing (HPP) at 250-700 MPa for 30-45 min affects the colour parameters, phytochemical contents and antioxidant activities of purple waxy corn kernels (p < 0.05). The higher pressure-level, the lower L(∗), a(∗), b(∗), C(∗) and h(o) (p < 0.05). However, pressure-treated kernels at 700 MPa showed a similar colour profile to steam-treated kernels. HPP caused a loss in the total phenolic, flavonoid, and anthocyanin contents and antioxidant activities. The pressure-treated kernels had a higher phytochemical content than the steam-treated kernels...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29141064/port-wine-stains-a-focused-review-on-their-management
#2
Katelyn Mariko Updyke, Amor Khachemoune
<p>Port-wine stain (PWS) is the second most common congenital vascular malformation characterized as ectatic capillaries and venules in the dermis that clinically appears as a deep red to purple patch on the skin. Typically, PWS progressively darken and may become hypertrophic or nodular without treatment. There are several treatment options available for PWS from topical antiangiogenic agents to laser therapies. Vascular-specific lasers are the gold standard in treating PWS and classically pulsed dye lasers are usually the treatment of choice...
November 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29139361/angiokeratoma-of-the-glans-penis
#3
Bryce D Beutler, Philip R Cohen
Angiokeratomas are benign vascular lesions characterized by ectatic blood vessels in the papillary dermis with overlying acanthosis and hyperkeratosis, often occurring as idiopathic scrotal tumor and rarely as penile lesions. Twelve men, including our case of a 58-year-old white man, have been reported with angiokeratomas of the glans penis. The lesions typically present as asymptomatic dome-shaped papules ranging in size from 0.5 to 5 mm and present as red, purple, blue, or black lesions along the penile coronal rim...
2017: Skinmed
https://www.readbyqxmd.com/read/29137766/mild-synthesis-of-a-zn-ii-metal-organic-polymer-and-its-hybrid-with-activated-carbon-application-as-antibacterial-agent-and-in-water-treatment-by-using-sonochemistry-optimization-kinetic-and-isotherm-study
#4
Tahere Taghipour, Gholamreza Karimipour, Mehrorang Ghaedi, Arash Asfaram
In this work, a room temperature and short method (30min) for synthesis of nanosized rod-like metal organic polymer (MOP) has been described. Reaction of 1,4-phenylenedioxy diacetic acid with zinc salt leads to the formation of [Zn(C10H8O6)(H2O)4]n and subsequently was loaded on activated carbon following sonication and structurally characterized by FTIR, SEM, EDX and XRD analysis. The combination of this new composite with sonication was applied for rapid and efficient adsorption of Bromocresol Purple (BCP)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29132827/high-performance-thin-layer-chromatographic-methods-in-the-evaluation-of-the-antioxidant-and-anti-hyperglycemic-activity-of-myrmecodia-platytyrea-as-a-promising-opportunity-in-diabetes-treatment
#5
S Agatonovic-Kustrin, D W Morton, A Adam, H H Mizaton, H Zakaria
The steady increase of diabetes is becoming a major burden on health care systems. As diabetic complications arise from oxidative stress, an antioxidant therapy along with anti-diabetic drugs is recommended. Myrmecodia or ant plant is highly valued as a traditional medicine in West Papua. It is used as an alternative treatment for diabetes, as the substances produced by ants can reduce blood sugar levels. The aim of this study was to develop and establish high-performance thin-layer chromatographic (HPTLC)-bioautographic methods to measure the antioxidant and hypoglycemic effects in different extracts from Myrmecodia platytyrea and to compare them with sterol content...
November 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29131579/binding-and-energetics-of-electron-transfer-between-an-artificial-four-helix-mn-protein-and-reaction-centers-from-rhodobacter-sphaeroides
#6
Eduardo Espiritu, Tien Le Olson, JoAnn C Williams, James P Allen
The ability of an artificial four-helix bundle Mn-protein, P1, to bind and transfer an electron to photosynthetic reaction centers from the purple bacterium Rhodobacter sphaeroides was characterized using optical spectroscopy. Upon illumination of reaction centers, an electron is transferred from P, the bacteriochlorophyll dimer, to QA, the primary electron acceptor. The P1 Mn-protein can bind to the reaction center and reduce the oxidized bacteriochlorophyll dimer, P+, with a dissociation constant of 1.2 µM at pH 9...
November 13, 2017: Biochemistry
https://www.readbyqxmd.com/read/29130160/use-of-whole-cell-bioassays-for-screening-quorum-signaling-quorum-interference-and-biofilm-dispersion
#7
Starla G Thornhill, Robert J C McLean
In most bacteria, a global level of regulation, termed quorum sensing (QS), exists involving intercellular communication via the production and response to cell density-dependent signal molecules. QS has been associated with a number of important features in bacteria including virulence regulation and biofilm formation. Consequently, there is considerable interest in understanding, detecting, and inhibiting QS. N-acylated homoserine lactones (AHLs) are used as extracellular QS signals by a variety of Gram-negative bacteria...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29127810/antimicrobial-activities-of-gaseous-essential-oils-against-listeria-monocytogenes-on-a-laboratory-medium-and-radish-sprouts
#8
Gyeongmin Lee, Yoonbin Kim, Hoikyung Kim, Larry R Beuchat, Jee-Hoon Ryu
The aim of this study was to evaluate the antimicrobial activities of gaseous essential oils (EO gases) against Listeria monocytogenes on the surfaces of a laboratory medium and radish sprouts. We determined the minimal inhibitory concentration (MIC) and minimal lethal concentration (MLC) values of EO gases from eight EOs extracted from basil leaves, carrot seed, cinnamon bark, cinnamon leaves, clove flower buds, oregano leaves, thyme flowers (linalool), and thyme leaves (thymol) against L. monocytogenes on a nutrient agar supplemented with 1% glucose and 0...
November 4, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29127540/evaluation-of-lighting-systems-carbon-sources-and-bacteria-cultures-on-photofermentative-hydrogen-production
#9
Chengcheng Hu, Sing-Ying Choy, Apostolos Giannis
Fluorescent and incandescent lighting systems were applied for batch photofermentative hydrogen production by four purple non-sulfur photosynthetic bacteria (PNSB). The hydrogen production efficiency of Rhodopseudomonas palustris, Rhodobacter sphaeroides, Rhodobacter capsulatus, and Rhodospirillum rubrum was evaluated using different carbon sources (acetate, butyrate, lactate, and malate). Incandescent light was found to be more effective for bacteria cell growth and hydrogen production. It was observed that PNSB followed substrate selection criteria for hydrogen production...
November 10, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/29125649/milker-s-nodule-an-occupational-infection-and-threat-to-the-immunocompromised
#10
REVIEW
Nancy S Handler, M Z Handler, Andris Rubins, Silvestr Rubins, Marcis Septe, Camila K Janniger, Robert A Schwartz
Milker's nodule virus, also called paravaccinia virus is a DNA virus of the parapoxvirus genus transmitted from infected cows to humans. It results from contact with cattle, cattle byproducts, or fomites. Classified as an occupational disorder, those at risk of exposure include farmers, butchers, and agricultural tourists. The viral infection begins 5-15 days after inoculation as an erythematous-purple, round nodule with a clear depressed center, and a surrounding erythematous ring. While familiar to those in farming communities, the presence of the nodule may be concerning to others, particularly the immunosuppressed...
November 10, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29125621/phenolic-composition-and-evaluation-of-the-antimicrobial-activity-of-free-and-bound-phenolic-fractions-from-a-peruvian-purple-corn-zea-mays-l-accession
#11
Lena Gálvez Ranilla, Ashish Christopher, Dipayan Sarkar, Kalidas Shetty, Rosana Chirinos, David Campos
Beneficial effects on overall gut health by phenolic bioactives-rich foods are potentially due to their modulation of probiotic gut bacteria and antimicrobial activity against pathogenic bacteria. Based on this rationale, the effect of the free and bound phenolic fractions from a Peruvian purple corn accession AREQ-084 on probiotic lactic acid bacteria such as Lactobacillus helveticus and Bifidobacterium longum and the gastric cancer-related pathogen Helicobacter pylori was evaluated. The free and bound phenolic composition was also determined by ultra-performance liquid chromatography...
November 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29124467/spathaspora-piracicabensis-f-a-sp-nov-a-d-xylose-fermenting-yeast-species-isolated-from-rotting-wood-in-brazil
#12
Camila S Varize, Raquel M Cadete, Lucas D Lopes, Renata M Christofoleti-Furlan, Marc-André Lachance, Carlos A Rosa, Luiz C Basso
Two strains of a novel yeast species were isolated from rotting wood of an ornamental tree (purple quaresmeira, Tibouchina granulosa, Melastomataceae) in an Atlantic Rainforest area in Brazil. Analysis of the sequences of the internal transcribed spacer (ITS-5.8S) region and the D1/D2 domains of the large subunit rRNA gene showed that this species belongs to the Spathaspora clade, and is phylogenetically related to Spathaspora brasiliensis, Candida materiae and Sp. girioi. The novel species ferments D-xylose, producing ethanol, with amounts between 3...
November 9, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29119317/prodigiosin-violacein-and-volatile-organic-compounds-produced-by-widespread-cutaneous-bacteria-of-amphibians-can-inhibit-two-batrachochytrium-fungal-pathogens
#13
Douglas C Woodhams, Brandon C LaBumbard, Kelly L Barnhart, Matthew H Becker, Molly C Bletz, Laura A Escobar, Sandra V Flechas, Megan E Forman, Anthony A Iannetta, Maureen D Joyce, Falitiana Rabemananjara, Brian Gratwicke, Miguel Vences, Kevin P C Minbiole
Symbiotic bacteria can produce secondary metabolites and volatile compounds that contribute to amphibian skin defense. Some of these symbionts have been used as probiotics to treat or prevent the emerging disease chytridiomycosis. We examined 20 amphibian cutaneous bacteria for the production of prodigiosin or violacein, brightly colored defense compounds that pigment the bacteria and have characteristic spectroscopic properties making them readily detectable, and evaluated the antifungal activity of these compounds...
November 9, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/29114403/transcriptomic-analysis-of-aerobic-respiratory-and-anaerobic-photosynthetic-states-in-rhodobacter-capsulatus-and-their-modulation-by-global-redox-regulators-rega-fnrl-and-crtj
#14
Joseph E Kumka, Heidi Schindel, Mingxu Fang, Sebastien Zappa, Carl E Bauer
Anoxygenicphotosynthetic prokaryotes have simplified photosystems that represent ancient lineages that predate the more complex oxygen evolving photosystems present in cyanobacteria and chloroplasts. These organisms thrive under illuminated anaerobic photosynthetic conditions, but also have the ability to grow under dark aerobic respiratory conditions. This study provides a detailed snapshot of transcription ground states of both dark aerobic and anaerobic photosynthetic growth modes in the purple photosynthetic bacterium Rhodobactercapsulatus...
September 2017: Microbial Genomics
https://www.readbyqxmd.com/read/29114241/a-nanoscale-study-of-carbon-and-nitrogen-fluxes-in-mats-of-purple-sulfur-bacteria-implications-for-carbon-cycling-at-the-surface-of-coastal-sediments
#15
Cédric Hubas, Dominique Boeuf, Bruno Jesus, Najet Thiney, Yann Bozec, Christian Jeanthon
Mass blooms of purple sulfur bacteria growing seasonally on green stranded macroalgae have a major impact on the microbial composition and functionality of intertidal mats. To explore the active anoxygenic phototrophic community in purple bacterial mats from the Roscoff Aber Bay (Brittany, France), we conducted a combined approach including molecular and high-resolution secondary ion mass spectrometry (NanoSIMS) analyses. To investigate the dynamics of carbon and nitrogen assimilation activities, NanoSIMS was coupled with a stable isotope probing (SIP) experiment and a compound specific isotope analysis (CSIA) of fatty acid methyl ester (FAME)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29109720/an-organismal-model-for-gene-regulatory-networks-in-the-gut-associated-immune-response
#16
REVIEW
Katherine M Buckley, Jonathan P Rast
The gut epithelium is an ancient site of complex communication between the animal immune system and the microbial world. While elements of self-non-self receptors and effector mechanisms differ greatly among animal phyla, some aspects of recognition, regulation, and response are broadly conserved. A gene regulatory network (GRN) approach provides a means to investigate the nature of this conservation and divergence even as more peripheral functional details remain incompletely understood. The sea urchin embryo is an unparalleled experimental model for detangling the GRNs that govern embryonic development...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29108412/allium-discoloration-color-compounds-formed-during-greening-of-processed-garlic
#17
Roman Kubec, Petr Curko, Petra Urajová, Josep Rubert, Jana Hajslova
Structures and formation pathways of compounds responsible for blue-green discoloration of processed garlic were studied in model systems. A procedure was developed for isolation of the color compounds and their tentative identification by HPLC-DAD-MS/MS. It was found that the pigment is a mixture of numerous pyrrole-based purple/blue and yellow species. Experiments with isotope-labeled precursors revealed that two molecules of an amino acid are involved in the formation of each color compound. In the purple/blue species (λmax 565-600 nm), both amino acid molecules are incorporated into two 3,4-dimethylpyrrole-derived rings linked together by a propenylidine bridge...
November 6, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29091422/engineering-an-e-coli-near-infrared-light-sensor
#18
Nicholas T Ong, Evan J Olson, Jeffrey J Tabor
Optogenetics is a technology wherein researchers combine light and genetically engineered photoreceptors to control biological processes with unrivaled precision. Near-infrared (NIR) wavelengths (>700 nm) are desirable optogenetic inputs due to their low phototoxicity and spectral isolation from most photoproteins. The bacteriophytochrome photoreceptor 1 (BphP1), found in several purple photosynthetic bacteria, senses NIR light and activates transcription of photosystem promoters by binding to and inhibiting the transcriptional repressor PpsR2...
November 9, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/29090907/colorimetric-nucleic-acid-detection-on-paper-microchip-using-loop-mediated-isothermal-amplification-and-crystal-violet-dye
#19
Sharmili Roy, Noor Faizah Mohd-Naim, Mohammadali Safavieh, Minhaz Uddin Ahmed
Nucleic acid detection is of paramount importance in monitoring of microbial pathogens in food safety and infectious disease diagnostic applications. To address these challenges, a rapid, cost-effective label-free technique for nucleic acid detection with minimal instrumentations is highly desired. Here, we present paper microchip to detect and quantify nucleic acid using colorimetric sensing modality. The extracted DNA from food samples of meat as well as microbial pathogens was amplified utilizing loop-mediated isothermal amplification (LAMP)...
November 10, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29086452/directing-a-non-heme-iron-iii-hydroperoxide-species-on-a-trifurcated-reactivity-pathway
#20
Christina Wegeberg, Frants Roager Lauritsen, Cathrine Frandsen, Steen Mørup, Wesley Browne, Christine J McKenzie
The reactivity of [FeIII(tpena)]2+ (tpena = N,N,N'-tris(2-pyridylmethyl)ethylendiamine-N'-acetate) as a catalyst for oxidation reactions depends on the ratio of [FeIII(tpena)]2+ to terminal oxidant H2O2 and presence or not of sacrificial substrates. The outcome can be switched between (i) catalysed H2O2 disproportionation, (ii) selective catalytic methanol or benzyl alcohol oxidation to the corresponding aldehyde or (iii) oxidative decomposition of the tpena ligand. A common mechanism is proposed involving homolytic O-O cleavage in the detected transient purple low-spin (S = ½) [(tpenaH)FeIIIO-OH]2+...
October 30, 2017: Chemistry: a European Journal
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