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https://www.readbyqxmd.com/read/28719215/origin-of-the-s-excited-state-feature-of-carotenoids-in-light-harvesting-complex-1-from-purple-photosynthetic-bacteria
#1
Dariusz M Niedzwiedzki, David Swainsbury, Elizabeth C Martin, Christopher Neil Hunter, Robert E Blankenship
This spectroscopic study investigates the origin of the transient feature of the S* excited-state of carotenoids bound in LH1 complexes from purple bacteria. The studies were performed on two RC-LH1 complexes from Rba. sphaeroides strains that bound carotenoids with different carbon-carbon double bond conjugation N, neurosporene (N = 9) and spirilloxanthin (N = 13). The S* transient spectral feature, originally associated with an elusive and optically silent excited state of spirilloxanthin in the LH1 complex may be successfully explained and mimicked without involving any unknown electronic state...
July 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28717210/linked-colour-imaging-benefits-the-endoscopic-diagnosis-of-distal-gastric-diseases
#2
Xiaotian Sun, Yiliang Bi, Tenghui Dong, Min Min, Wei Shen, Yang Xu, Yan Liu
Gastric diseases are common in China, and gastroduodenoscopy could provide accurate diagnoses. Our previous study verified that linked colour imaging (LCI) can improve endoscopic diagnostic accuracy. This study aimed for the first time to establish an LCI-based endoscopic model called colour-microstructure-vessel (CMV) criteria and validated its clinical feasibility for detecting distal gastric diseases manifested as red mucosal lesions under endoscopy in a cohort of 62 patients. Colour features were extracted from the endoscopic images and categorized into 3 types...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28714761/gamma-irradiation-of-medicinally-important-plants-and-the-enhancement-of-secondary-metabolite-production
#3
P Vivek Vardhan, Lata I Shukla
PURPOSE: The profitable production of some important plant-based secondary metabolites (ginsenosides, saponins, camptothecin, shikonins etc.) in vitro by gamma irradiation is a current area of interest. We reviewed different types of secondary metabolites, their mode of synthesis and effect of γ-radiation on their yield for different plants, organs and in vitro cultures (callus, suspension, hairy root). Special effort has been made to review the biochemical mechanisms underlying the increase in secondary metabolites...
July 17, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28713368/the-sptransformer-gene-family-formerly-sp185-333-in-the-purple-sea-urchin-and-the-functional-diversity-of-the-anti-pathogen-rsptransformer-e1-protein
#4
REVIEW
L Courtney Smith, Cheng Man Lun
The complex innate immune system of sea urchins is underpinned by several multigene families including the SpTransformer family (SpTrf; formerly Sp185/333) with estimates of ~50 members, although the family size is likely variable among individuals of Strongylocentrotus purpuratus. The genes are small with similar structure, are tightly clustered, and have several types of repeats in the second of two exons and that surround each gene. The density of repeats suggests that the genes are positioned within regions of genomic instability, which may be required to drive sequence diversification...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28711475/the-interaction-between-subclinical-psychotic-experiences-insomnia-and-objective-measures-of-sleep
#5
Jan Cosgrave, Ross Haines, Dalena van Heugten-van der Kloet, Ross Purple, Kate Porcheret, Russell Foster, Katharina Wulff
Investigations into schizophrenia have revealed a high incidence of comorbidity with disturbed sleep and circadian timing. Acknowledging this comorbidity on a dimensional level, we tested prospectively whether subclinical psychotic symptoms are more prevalent in individuals with insomnia. An insomnia group (n=21) and controls (n=22) were recruited on their subjective sleep quality, recorded actigraphically for 3weeks and assessed for psychotic-like experiences with The Prodromal Questionnaire-16. Using multivariate Poisson regression analyses, we found that objective and subjective sleep measures interact to predict the highest risk for psychotic experiences...
July 12, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28705285/childhood-onset-keratosis-lichenoides-chronica-accompanied-by-severe-hair-loss
#6
Sibel Dogan, Efsun Kılınç, Gül Erkin Özaygen, Nilgün Atakan, Özay Gököz, Sibel Ersoy Evans
A 37-year-old woman attended the dermatology outpatient clinic because of recent hair loss from the eyebrows and axillae. Her past medical history revealed mild generalized erythema and hyperpigmented papules and plaques since childhood. On dermatologic examination, there were flat-topped, purple to brown hyperkeratotic lichenoid papules and linear plaques on the elbows, trunk, and buttocks, some of which coalesced into hyperpigmented reticular plaques on the axillae, neck, and groin. Mild erythema was noted...
2017: Skinmed
https://www.readbyqxmd.com/read/28702037/transcriptomic-response-of-purple-willow-salix-purpurea-to-arsenic-stress
#7
Aymeric Yanitch, Nicholas J B Brereton, Emmanuel Gonzalez, Michel Labrecque, Simon Joly, Frederic E Pitre
Arsenic (As) is a toxic element for plants and one of the most common anthropogenic pollutants found at contaminated sites. Despite its severe effects on plant metabolism, several species can accumulate substantial amounts of arsenic and endure the associated stress. However, the genetic mechanisms involved in arsenic tolerance remains obscure in many model plant species used for land decontamination (phytoremediation), including willows. The present study assesses the potential of Salix purpurea cv. 'Fish Creek' for arsenic phytoextraction and reveals the genetic responses behind arsenic tolerance, phytoextraction and metabolism...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28698862/antimutagenic-and-antioxidant-activities-of-thai-rice-brans
#8
Orapin Insuan, Arpamas Chariyakornkul, Yuwada Rungrote, Rawiwan Wongpoomchai
BACKGROUND: Rice bran is the outer layer of the rice grain, and contains high amounts of bioactive phytochemicals. Here, we investigated and compared chemopreventive properties of purple and white rice bran extracts. METHODS: Rice bran was extracted with dichloromethane and methanol. Chemical constituents in the extracts were analyzed by colorimetric assay and high performance liquid chromatography. The mutagenicity and antimutagenicity of the extracts were determined via the Salmonella mutation assay...
June 2017: Journal of Cancer Prevention
https://www.readbyqxmd.com/read/28697474/extraction-of-natural-colorant-from-purple-sweet-potato-and-dyeing-of-fabrics-with-silver-nanoparticles-for-augmented-antibacterial-activity-against-skin-pathogens
#9
Palanivel Velmurugan, Jae-In Kim, Kangmin Kim, Jung-Hee Park, Kui-Jae Lee, Woo-Suk Chang, Yool-Jin Park, Min Cho, Byung-Taek Oh
The main objective of this study was to extract natural colorant from purple sweet potato powder (PSPP) via a water bath and ultrasound water bath using acidified ethanol (A. EtOH) as the extraction solvent. When optimizing the colorant extraction conditions of the solvents, acidified ethanol with ultrasound yielded a high extraction capacity and color intensity at pH2, temperature of 80°C, 20mL of A. EtOH, 1.5g of PSPP, time of 45min, and ultrasonic output power of 75W. Subsequently, the colorant was extracted using the optimized conditions for dyeing of textiles (leather, silk, and cotton)...
July 4, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28696739/charge-density-waves-and-the-hidden-nesting-of-purple-bronze-k_-0-9-mo_-6-o_-17
#10
Lei Su, Chuang-Han Hsu, Hsin Lin, Vitor M Pereira
We introduce the first multiorbital effective tight-binding model to describe the effect of electron-electron interactions in this system. Upon fixing all the effective hopping parameters in the normal state against an ab initio band structure, and with only the overall scale of the interactions as the sole adjustable parameter, we find that a self-consistent Hartree-Fock solution reproduces extremely well the experimental behavior of the charge density wave (CDW) order parameter in the full range 0<T<T_{c}, as well as the precise reciprocal space locations of the partial gap opening and Fermi arc development...
June 23, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28696577/phototransformative-supramolecular-assembly-of-amphiphilic-diarylethenes-realized-by-the-combination-of-photochromism-and-lower-critical-solution-temperature-behavior
#11
Hajime Yotsuji, Kenji Higashiguchi, Ryuma Sato, Yasuteru Shigeta, Kenji Matsuda
Amphiphilic diarylethenes with octyloxycarbonyl and N-octylcarbamoyl groups were designed and synthesized. These ester- and amide-linked compounds formed micrometer-sized supramolecular assemblies in water and these assemblies exhibited photoinduced macroscopic morphological transformation upon alternate irradiation with UV and visible lights. Ester-linked diarylethene showed a transformation between colorless spheres and red-purple hazy fringe, while microspheres of amide-linked diarylethene showed the change in color, size, and shape, but the spheres did not show division...
July 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28694423/a-new-energy-transfer-channel-from-carotenoids-to-chlorophylls-in-purple-bacteria
#12
Jin Feng, Chi-Wei Tseng, Tingwei Chen, Xia Leng, Huabing Yin, Yuan-Chung Cheng, Michael Rohlfing, Yuchen Ma
It is unclear whether there is an intermediate dark state between the S2 and S1 states of carotenoids. Previous two-dimensional electronic spectroscopy measurements support its existence and its involvement in the energy transfer from carotenoids to chlorophylls, but there is still considerable debate on the origin of this dark state and how it regulates the energy transfer process. Here we use ab initio calculations on excited-state dynamics and simulated two-dimensional electronic spectrum of carotenoids from purple bacteria to provide evidence supporting that the dark state may be assigned to a new Ag(+) state...
July 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28693972/polymer-interaction-driven-diffusionof-eyeshadow-in-soft-contact-lenses
#13
Silvia Tavazzi, Alessandra Rossi, Sara Picarazzi, Miriam Ascagni, Stefano Farris, Alessandro Borghesi
Soft contact lenses used for the correction of ametropia are often made of hydrogel and silicone-hydrogel materials. Since they are placed directly on the surface of the eye and they are hydrated by tears, eye cosmetics can compromise the lens performance and, even worse, can be transported from an external environment to the ocular surface through the contact lens. The diffusion of the dye component of a purple eyeshadow in soft contact lenses of different materials is here evaluated. Diffusivity is found to be typically higher in silicone-hydrogels than in hydrogels...
July 7, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28691370/bioaccessibility-bioavailability-and-anti-inflammatory-effects-of-anthocyanins-from-purple-root-vegetables-using-mono-and-co-culture-cell-models
#14
Hua Zhang, Hassan Yousef, Justin Renaud, Ronghua Liu, Cheng Yang, Yong Sun, Rong Tsao
SCOPE: Immune-inflammatory, signalling and metabolic effects are the main pillars for bioactivity of anthocyanins derived from highly pigmented root vegetables. This study aims to assess the bioaccessibility and bioavailability of purple carrot and potato derived anthocyanins and the molecular mechanisms of their ability to ameliorate cellular inflammation in a mono- and co-culture cell models. METHODS AND RESULTS: An in vitro gastrointestinal model was used and demonstrated bioaccessibility of 44...
July 10, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28689402/purple-fibrils-a-new-type-of-protein-chromophore
#15
Tatiana Quiñones-Ruiz, Manuel F Rosario-Alomar, Karina Ruiz-Esteves, Maruda Shanmugasundaram, Vladimir Grigoryants, Charles Scholes, Juan López-Garriga, Igor K Lednev
A purple color is formed during the fibrillation of lysozyme, a well-studied protein lacking a prosthetic group. The application of Raman spectroscopy, electron paramagnetic resonance and UV-vis absorption spectroscopy indicates the formation of a sulfur∴π-bonded radical cation due to the methionine-phenylalanine interaction, which is consistent with a small molecule model reported in the literature. A purple chromophore with characteristic 550 nm absorption is formed due to a specific orientation of the sulfur-centered radical cation and a phenyl ring stabilized by the fibril framework...
July 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28686275/power-dependent-upconversion-quantum-yield-of-nayf4-yb-3-er-3-nano-and-micrometer-sized-particles-measurements-and-simulations
#16
Martin Kaiser, Christian Würth, Marco Kraft, Iko Hyppänen, Tero Soukka, Ute Resch-Genger
Photophysical studies of nonlinear lanthanide-doped photon upconverting nanoparticles (UCNPs) increasingly used in biophotonics and photovoltaics require absolute measurements of the excitation power density (P)-dependent upconversion luminescence (UCL) and luminescence quantum yields (ΦUC) for quantifying the material performance, UCL deactivation pathways, and possible enhancement factors. We present here the P-dependence of the UCL spectra, ΦUC, and slope factors of the different emission bands of representative 25 nm-sized oleate-capped β-NaYF4:17% Yb(3+), 3% Er(3+) UCNPs dispersed in toluene and as powder as well as ΦUC of 3 μm-sized upconversion particles (UCμP), all measured with a newly designed integrating sphere setup, enabling controlled variation of P over four orders of magnitude...
July 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/28683535/in-silico-modeling-of-indigo-and-tyrian-purple-single-electron-nano-transistors-using-density-functional-theory-approach
#17
Sergey Shityakov, Norbert Roewer, Carola Förster, Jens-Albert Broscheit
The purpose of this study was to develop and implement an in silico model of indigoid-based single-electron transistor (SET) nanodevices, which consist of indigoid molecules from natural dye weakly coupled to gold electrodes that function in a Coulomb blockade regime. The electronic properties of the indigoid molecules were investigated using the optimized density-functional theory (DFT) with a continuum model. Higher electron transport characteristics were determined for Tyrian purple, consistent with experimentally derived data...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28677586/squiz-your-knowledge-a-red-purple-plaque-on-a-housewife-s-thumb
#18
Eugénia Matos Pires, Rita Ramos Pinheiro, Alexandre João
No abstract text is available yet for this article.
June 1, 2017: European Journal of Dermatology: EJD
https://www.readbyqxmd.com/read/28677146/genes-essential-for-phototrophic-growth-by-a-purple-alphaproteobacterium
#19
Jianming Yang, Liang Yin, Faith H Lessner, Ernesto S Nakayasu, Samuel H Payne, Kathryn R Fixen, Larry Gallagher, Caroline S Harwood
We used Tn-seq to identify genes essential for phototrophic growth by the purple bacterium Rhodopseudomonas palustris. We identified 167 genes required for anaerobic growth on acetate in light, 35 of which are annotated as photosynthesis genes. We verified the essentiality of many of these genes by analyzing the phenotypes of independently generated mutants that had altered pigmentation. We also identified three genes, two possibly involved in biogenesis of the membrane-bound photosynthetic apparatus and one for phosphadidylcholine biosynthesis, that were not known to be essential for phototrophic growth...
July 5, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28677087/cloning-of-bbtv-banana-bunchy-top-virus-components-and-screening-of-bbtv-using-functionalized-gold-nanoparticles
#20
P Kumar, V Arun, T S Lokeswari
Banana bunchy top virus (BBTV) affects all varieties of banana plants and causes heavy economic loss in most of the banana cultivating areas. The BBTV genome comprises of six DNA components; in this study, we have cloned the six BBTV-DNA components from one of the BBTV-infected plants (Tri-8) and were submitted to GenBank. Analysis of the BBTV DNA-R component showed that it belonged to south Pacific group. Resistance against BBTV has not been observed so far in banana plants and removal and killing of the infected plants has been routinely practiced...
July 2017: 3 Biotech
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