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https://www.readbyqxmd.com/read/29775926/chlorophyll-a-%C3%AF-uorescence-and-transcriptome-reveal-the-toxicological-effects-of-bisphenol-a-on-an-invasive-cyanobacterium-cylindrospermopsis-raciborskii
#1
Rong Xiang, Junqiong Shi, Hongbo Zhang, Congcong Dong, Li Liu, JunKe Fu, Xinyu He, Yanjun Yan, Zhongxing Wu
Bisphenol A has attracted worldwide attention due to its harmful effects on humans, animals and plants. In this study, the toxicological effects of BPA on Cylindrospermopsis raciborskii were assessed based on chlorophyll a fluorescence and transcriptome analyses. The results showed that the growth of C. raciborskii was significantly inhibited when BPA exceeded 0.1 mg L-1 . A marked rise of phase J was observed at a concentration greater than 0.1 mg L-1 , while a K phase appeared at 20 mg L-1 . The chlorophyll a fluorescence parameters of RC/CS0 , F0 , φP0 , φE0 , and ψ0 , underwent a significant decline under all treatments of BPA, whereas a significant increase in both VJ and M0 occurred under all concentrations of BPA...
May 9, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29773581/dynamic-changes-between-two-lhcx-related-energy-quenching-sites-control-diatom-photoacclimation
#2
Lucilla Taddei, Volha Chukhutsina, Bernard Lepetit, Giulio R Stella, Roberto Bassi, Herbert van Amerongen, Jean-Pierre Bouly, Marianne Jaubert, Giovanni Finazzi, Angela Falciatore
Marine diatoms are prominent phytoplankton organisms, optimally performing photosynthesis in extremely variable environments. Diatoms possess a strong ability to dissipate excess absorbed energy as heat via non-photochemical quenching (NPQ). This process relies on changes in carotenoid pigment composition (xanthophyll cycle) and on specific members of the light-harvesting complex (LHC) family specialized in photoprotection (LHCX), which potentially act as NPQ effectors. However, the link between light stress, NPQ, and the existence of different LHCX isoforms is not understood in these organisms...
May 17, 2018: Plant Physiology
https://www.readbyqxmd.com/read/29772798/interrelationships-between-fatty-acid-composition-staphyloxanthin-content-fluidity-and-carbon-flow-in-the-staphylococcus-aureus-membrane
#3
Kiran B Tiwari, Craig Gatto, Brian J Wilkinson
Fatty acids play a major role in determining membrane biophysical properties. Staphylococcus aureus produces branched-chain fatty acids (BCFAs) and straight-chain saturated fatty acids (SCSFAs), and can directly incorporate exogenous SCSFAs and straight-chain unsaturated fatty acids (SCUFAs). Many S. aureus strains produce the triterpenoid pigment staphyloxanthin, and the balance of BCFAs, SCSFAs and staphyloxanthin determines membrane fluidity. Here, we investigated the relationship of fatty acid and carotenoid production in S...
May 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29772774/selected-plant-metabolites-involved-in-oxidation-reduction-processes-during-bud-dormancy-and-ontogenetic-development-in-sweet-cherry-buds-prunus-avium-l
#4
Susanne Baldermann, Thomas Homann, Susanne Neugart, Frank-M Chmielewski, Klaus-Peter Götz, Kristin Gödeke, Gerd Huschek, Getrud E Morlock, Harshadrai M Rawel
Many biochemical processes are involved in regulating the consecutive transition of different phases of dormancy in sweet cherry buds. An evaluation based on a metabolic approach has, as yet, only been partly addressed. The aim of this work, therefore, was to determine which plant metabolites could serve as biomarkers for the different transitions in sweet cherry buds. The focus here was on those metabolites involved in oxidation-reduction processes during bud dormancy, as determined by targeted and untargeted mass spectrometry-based methods...
May 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29772507/novel-insight-of-carotenoid-and-lipid-biosynthesis-and-their-roles-in-storage-carbon-metabolism-in-chlamydomonas-reinhardtii
#5
Han Sun, Xuemei Mao, Tao Wu, Yuanyuan Ren, Feng Chen, Bin Liu
Revenues of carotenoid and lipid biosynthesis under excess light and nitrogen starvation were firstly analyzed for the increased biomass value through carbon metabolism analysis. The results suggested excess light and nitrogen starvation resulted in carbon partitioning among protein, starch, lipid and carotenoid. Nitrogen starvation promoted more cellular lipid content than excess light, while excess light promoted carotenoid and polyunsaturated fatty acid accumulation. In the molecular level, the stresses redirected carbon skeletons into the central metabolite of pyruvate and oriented into starch and lipid as the primary and secondary carbon storage, respectively...
May 10, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29771123/carotenoids-experimental-ionization-energies-and-capacity-at-inhibiting-lipid-peroxidation-in-a-chemical-model-of-dietary-oxidative-stress
#6
Olivier Dangles, Pascale Goupy, Michel Carail, Alexandre Giuliani, Denis Duflot, Catherine Caris-Veyrat
Carotenoids are important natural pigments and micronutrients contributing to health prevention by several mechanisms, including their electron-donating (antioxidant) activity. In this work, a large series of carotenoids, including 11 carotenes and 14 xanthophylls, has been investigated by wavelength-resolved atmospheric pressure photoionization mass spectrometry (DISCO line of SOLEIL synchrotron), thus allowing the experimental determination of their ionization energy (IE) for the first time. On the other hand, the carotenoids have been also investigated for their ability to inhibit the heme iron-induced peroxidation of linoleic acid in mildly acidic micelles, a simple but relevant chemical model of oxidative stress in the gastric compartment...
May 17, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29767548/disruption-of-chloroplast-function-through-downregulation-of-phytoene-desaturase-enhances-the-systemic-accumulation-of-an-aphid-borne-phloem-restricted-virus
#7
Stacy L DeBlasio, Ana Rita Rebelo, Katherine Parks, Stewart Gray, Michelle Cilia
Chloroplasts play a central role in pathogen defense in plants. However, the majority of studies explaining the relationship between pathogens and chloroplasts have focused on pathogens that infect mesophyll cells. In contrast, the family Luteoviridae comprises RNA viruses that replicate and traffic exclusively in the phloem. Recently, our lab has shown that Potato leafroll virus (PLRV), the type species in the genus Polerovirus, forms an extensive interaction network with chloroplast-localized proteins, which is partially dependent on the PLRV capsid readthrough domain (RTD)...
May 16, 2018: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29766689/furan-in-roasted-ground-and-brewed-coffee
#8
Eliza Gruczyńska, Dorota Kowalska, Mariola Kozłowska, Ewa Majewska, Katarzyna Tarnowska
Coffee is the most popular hot beverage in the world. The annual coffee production in 2010, 2014 and 2016 was 8.1, 9.0 and 9.3 million tons respectively. There are more than 100 coffee species, but only two of them: Arabica (Coffea arabica) and Robusta (Coffea canephora) have gained commercial importance. During roasting of green coffee beans not only desirable compounds are formed, that exert positive influence on the taste and flavour of coffee, but also small quantities of undesirable ones. Furan (C4H4O) is one of the latter...
2018: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/29762545/marine-microalgae-with-anti-cancer-properties
#9
REVIEW
Kevin A Martínez Andrade, Chiara Lauritano, Giovanna Romano, Adrianna Ianora
Cancer is the leading cause of death globally and finding new therapeutic agents for cancer treatment remains a major challenge in the pursuit for a cure. This paper presents an overview on microalgae with anti-cancer activities. Microalgae are eukaryotic unicellular plants that contribute up to 40% of global primary productivity. They are excellent sources of pigments, lipids, carotenoids, omega-3 fatty acids, polysaccharides, vitamins and other fine chemicals, and there is an increasing demand for their use as nutraceuticals and food supplements...
May 15, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29761544/effect-of-dietary-counselling-with-prosthetic-restoration-on-fruit-and-vegetable-intake-in-partially-dentate-patients-a-prospective-study
#10
Gen Nabeshima, Kenji Fueki, Yuka Inamochi, Noriyuki Wakabayashi
The aim of this study was to investigate the effects of a counselling-based dietary intervention on nutritional status in partially dentate patients receiving removable partial dentures (RPDs). Thirty-eight patients [mean age (standard deviation): 73.2 (7.7) years] who were scheduled to receive RPDs at a dental hospital and were currently eating < 350 g of vegetables per day were included in the study. A dentist provided basic dietary counselling aimed at increasing dietary fruit and vegetable intake and improving dietary habits...
May 14, 2018: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29760884/habitat-constraints-on-carotenoid-based-coloration-in-a-small-euryhaline-teleost
#11
Francesco Cavraro, Giulia Gheno, Renzo Ganzerla, Matteo Zucchetta, Piero Franzoi, Stefano Malavasi
Display of bright and striking color patterns is a widespread way of communication in many animal species. Carotenoid-based coloration accounts for most of the bright yellow, orange, and red displays in invertebrates, fish, amphibians, reptiles, and birds, being widely considered a signal of individual health. This type of coloration is under the influence of several factors, such as sexual selection, predator pressure, pigment availability, and light transmission. Fish offer numerous examples of visual communication by means of color patterns...
May 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29758494/uncovering-potential-anti-neuroinflammatory-components-of-modified-wuziyanzong-prescription-through-a-target-directed-molecular-docking-fingerprint-strategy
#12
Jinfeng Chen, Jinlong Wang, Yingyuan Lu, Shaoyang Zhao, Qian Yu, Xuemei Wang, Pengfei Tu, Kewu Zeng, Yong Jiang
Neuroinflammation is a main factor in the pathogenesis of neurodegenerative diseases, such as Alzheimer disease. Our previous studies indicated that the modified Wuziyanzong Prescription (MWP) can suppress neuroinflammatory responses via nuclear factor-kappa B (NF-κB) and mitogen-activated protein kinases (MAPKs) signaling pathways. However, the anti-neuroinflammatory components of MWP remain unclear. Herein, a target-directed molecular docking fingerprint (TMDF) strategy, via integrating the chemical profiling and molecular docking approaches, was developed to identify the potential anti-neuroinflammatory components of MWP...
May 1, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29758419/seasonal-ionomic-and-metabolic-changes-in-aleppo-pines-growing-on-mine-tailings-under-mediterranean-semi-arid-climate
#13
Antonio López-Orenes, María C Bueso, Héctor Conesa, Antonio A Calderón, María A Ferrer
Aleppo pine is the most abundant conifer species in Mediterranean basin. Knowledge of adaptive mechanisms to cope with different environmental stresses simultaneously is necessary to improve its resilience to the predicted climatic changes and anthropogenic stressors, such as heavy metal/metal(loid)s (HMMs) pollution. Here, one year-old needles and rhizosphere soil samples from five mining and non-mining (NM) populations of Aleppo pines grown spontaneously in SE Spain were sampled in two consecutive years during spring and summer...
May 11, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29757643/peridinin-torsional-distortion-and-bond-length-alternation-introduce-intramolecular-charge-transfer-and-correlated-triplet-pair-intermediate-excited-states
#14
Elliot J Taffet, Gregory D Scholes
The nature of intramolecular charge transfer (ICT) and the mechanism of intramolecular singlet fission (SF) in peridinin remain open research questions. Obtaining an understanding of the population evolution from the bright state to dark states following a photoinduced electronic transition is critical. Unambiguously describing this evolution in peridinin, and light-harvesting carotenoids in general, has proven elusive experimentally and computationally. To offer a balanced description of bright- and dark-state electronic structure, we here apply ab initio multireference perturbation theory quantum chemistry-the density matrix renormalization group self-consistent-field (DMRG-SCF) and complete-active space self-consistent field (CASSCF) with second-order N-electron valence perturbation theory (NEVPT2)...
May 14, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29755497/lycopene-is-enriched-in-tomato-fruit-by-crispr-cas9-mediated-multiplex-genome-editing
#15
Xindi Li, Yanning Wang, Sha Chen, Huiqin Tian, Daqi Fu, Benzhong Zhu, Yunbo Luo, Hongliang Zhu
Numerous studies have been focusing on breeding tomato plants with enhanced lycopene accumulation, considering its positive effects of fruits on the visual and functional properties. In this study, we used a bidirectional strategy: promoting the biosynthesis of lycopene, while inhibiting the conversion from lycopene to β- and α-carotene. The accumulation of lycopene was promoted by knocking down some genes associated with the carotenoid metabolic pathway. Finally, five genes were selected to be edited in genome by CRISPR/Cas9 system using Agrobacterium tumefaciens -mediated transformation...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29753723/ms-tools-for-a-systematic-approach-in-survey-for-carotenoids-and-their-common-metabolites
#16
REVIEW
A Pérez-Gálvez, A Sánchez-García, J Garrido-Fernández, J J Ríos
Metabolism of the carotenoids in humans is often reserved to bioconversion of provitamin A carotenoids in retinoids and oxidative/degradative products arising from enzymatic eccentric cleavage, yielding apo-carotenoids. Nevertheless, additional metabolic routes should be available, and some of the structures of those metabolites have only been anticipated. The identification of carotenoids and their metabolites is commonly performed by HPLC coupled to MS. The acquisition of MS data in different instrumental modes and hardware configurations allows the detailed structural description of the target compound...
May 10, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29753136/the-allelochemical-trans-cinnamic-acid-stimulates-salicylic-acid-production-and-galactose-pathway-in-maize-leaves-a-potential-mechanism-of-stress-tolerance
#17
Fabrizio Araniti, Antonio Lupini, Antonio Mauceri, Antonino Zumbo, Francesco Sunseri, Maria Rosa Abenavoli
In this study, the effects (5 days) of the secondary metabolite trans-cinnamic acid on maize leaves (Zea mays L.), through a physiological and an untargeted metabolomic approach, were evaluated. A reduction in leaf growth and development accompanied by a decrease in protein content was observed in treated seedlings. Besides, trans-cinnamic acid stimulated the photosynthetic machinery with a significant increment in pigment content (chlorophyll a, b and carotenoids), a stimulation of the light adapted PSII efficiency (ɸII ) as well as the chlorophyll a fluorescence (YNO ), the apparent electron transport rate, and the regulated dissipation of the energy (YNPQ )...
May 5, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29752566/construction-of-an-alternative-glycerol-utilization-pathway-for-improved-%C3%AE-carotene-production-in-escherichia-coli
#18
Jin-Ying Guo, Kun-Le Hu, Chang-Hao Bi, Qing-Yan Li, Xue-Li Zhang
Glycerol, which is an inevitable by-product of biodiesel production, is an ideal carbon source for the production of carotenoids due to its low price, good availability and chemically reduced status, which results in a low requirement for additional reducing equivalents. In this study, an alternative carbon-utilization pathway was constructed in Escherichia coli to enable more efficient β-carotene production from glycerol. An aldehyde reductase gene (alrd) and an aldehyde dehydrogenase gene (aldH) from Ralstonia eutropha H16 were integrated into the E...
May 11, 2018: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29751918/transglutaminase-mediated-microencapsulation-of-sea-buckthorn-supercritical-co-2-extract-in-whey-protein-isolate-and-valorization-in-highly-value-added-food-products
#19
Liliana Mihalcea, Mihaela Turturică, Vasilica Barbu, Elena Ioniţă, Livia Pătraşcu, Mihaela Cotârleţ, Loredana Dumitraşcu, Iuliana Aprodu, Gabriela Râpeanu, Nicoleta Stănciuc
Sea buckthorn carotenoids extracted using CO2 supercritical fluids method were encapsulated within whey proteins isolate by transglutaminase (TG) mediated crosslinking reaction, coacervation and freeze drying. The encapsulation efficiency was 36.23 ± 1.58%, with β-carotene the major carotenoid present in the powder. The confocal analysis revealed that TG-ase mediated cross-linking reaction enhanced the complexes stability to such a manner that a double microencapsulation was performed. The powder showed an antioxidant activity of 2...
October 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29751912/%C3%AE-cryptoxanthin-is-more-bioavailable-in-humans-from-fermented-orange-juice-than-from-orange-juice
#20
Dámaso Hornero-Méndez, Isabel Cerrillo, Ángeles Ortega, María-Rosario Rodríguez-Griñolo, Blanca Escudero-López, Franz Martín, María-Soledad Fernández-Pachón
Carotenoids, especially β-cryptoxanthin, exert multiple biological activities in the organism. Various processing techniques can improve carotenoid bioavailability in relation to the food matrix. The study objective was to compare the bioavailability of carotenoids from orange juice (OJ) with that from a beverage obtained by alcoholic fermentation of orange juice (FOB). Seven volunteers were recruited for a randomized, controlled, and crossover study. Post-intake plasma carotenoid concentrations were measured by HPLC in the subjects at 0-8 h after their consumption of OJ or FOB...
October 1, 2018: Food Chemistry
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