keyword
MENU ▼
Read by QxMD icon Read
search

Photoprotection systemic

keyword
https://www.readbyqxmd.com/read/28487674/uncovering-potential-applications-of-cyanobacteria-and-algal-metabolites-in-biology-agriculture-and-medicine-current-status-and-future-prospects
#1
REVIEW
Rachana Singh, Parul Parihar, Madhulika Singh, Andrzej Bajguz, Jitendra Kumar, Samiksha Singh, Vijay P Singh, Sheo M Prasad
Cyanobacteria and algae having complex photosynthetic systems can channelize absorbed solar energy into other forms of energy for production of food and metabolites. In addition, they are promising biocatalysts and can be used in the field of "white biotechnology" for enhancing the sustainable production of food, metabolites, and green energy sources such as biodiesel. In this review, an endeavor has been made to uncover the significance of various metabolites like phenolics, phytoene/terpenoids, phytols, sterols, free fatty acids, photoprotective compounds (MAAs, scytonemin, carotenoids, polysaccharides, halogenated compounds, etc...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28464994/genotoxic-effects-of-zinc-oxide-nanoparticles-in-nasal-mucosa-cells-are-antagonized-by-titanium-dioxide-nanoparticles
#2
Stephan Hackenberg, Agmal Scherzed, Angela Zapp, Katrin Radeloff, Christian Ginzkey, Thomas Gehrke, Pascal Ickrath, Norbert Kleinsasser
Titanium dioxide nanoparticles (TiO2-NPs) and zinc oxide nanoparticles (ZnO-NPs) are often used in sunscreens and other consumer products due to their photoprotective properties. However, concern exists regarding them possibly causing cyto- and genotoxic effects. The aim of this study was to assess cyto- and genotoxicity of these nanomaterials after single or combined exposure. For this purpose, a battery of cell culture test systems for human nasal mucosa (monolayer, air-liquid interface and mini organ culture) were exposed to 0...
April 2017: Mutation Research
https://www.readbyqxmd.com/read/28456146/comparative-effects-of-a-fixed-polypodium-leucotomos-pomegranate-combination-versus-polypodium-leucotomos-alone-on-skin-biophysical-parameters
#3
Enzo Emanuele, Marco Bertona, Marco Biagi
OBJECTIVES: Polypodium leucotomos extract is a commonly used systemic photoprotective agent. In an exploratory fashion, the current study aimed to compare the effects of oral supplementation with a fixed Polypodium leucotomos/pomegranate combination (PPmix®) versus Polypodium leucotomos alone (Fernblock®) on skin biophysical parameters of Caucasian adults. METHODS: Forty healthy adult volunteers (20 males and 20 females; mean age: 37.2±5.5 years) were randomized in a 1:1 fashion to a fixed Polypodium leucotomos/pomegranate combination (480 mg/day; n=20) or Polypodium leucotomos alone (480 mg/day; n=20) for 3 months...
February 15, 2017: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28448268/the-effect-of-pycnogenol-on-wound-healing-in-diabetic-rats
#4
Elif Dogan, Latif Yanmaz, Semin Gedikli, Ugur Ersoz, Zafer Okumus
Pycnogenol (PYC), an extract of pine bark, is known to have photoprotective, antimicrobial, antioxidant, and anti-inflammatory properties. An in vivo study was conducted to evaluate the effects of PYC treatment on wound healing in 48 adult male Sprague-Dawley rats, of which 24 were injected with a single dose of alloxan to induce diabetes. Three (3) excisional skin wounds (1.3 cm x 1.3 cm x 2 mm) were created in each healthy and diabetic animal. One (1) wound in each animal was left untreated, 1 was treated daily with a cleanser (ethacridine lactate) and covered with silver sulfadiazine (SSD), and 1 was treated with PYC powder (30 mg)...
April 2017: Ostomy/wound Management
https://www.readbyqxmd.com/read/28445834/light-harvesting-antenna-complexes-in-the-moss-physcomitrella-patens-implications-for-the-evolutionary-transition-from-green-algae-to-land-plants
#5
REVIEW
Masakazu Iwai, Makio Yokono
Plants have successfully adapted to a vast range of terrestrial environments during their evolution. To elucidate the evolutionary transition of light-harvesting antenna proteins from green algae to land plants, the moss Physcomitrella patens is ideally placed basally among land plants. Compared to the genomes of green algae and land plants, the P. patens genome codes for more diverse and redundant light-harvesting antenna proteins. It also encodes Lhcb9, which has characteristics not found in other light-harvesting antenna proteins...
April 23, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28445599/growth-engineering-of-synechococcus-elongatus-pcc-7942-for-mixotrophy-under-natural-light-conditions-for-improved-feedstock-production
#6
Aditya Sarnaik, Reena Pandit, Arvind Lali
Synechococcus elongatus PCC 7942 has been widely explored as cyanobacterial cell factory through genetic modifications for production of various value-added compounds. However, successful industrial scale-ups have not been reported for the system predominantly due to its obligate photoautotrophic metabolism and use of artificial light in photobioreactors. Hence, engineering the organism to perform mixotrophy under natural light could serve as an effective solution. Thus, we applied a genetically engineered strain of Synechococcus elongatus PCC 7942 expressing heterologous hexose transporter gene (galP) to perform mixotrophy under natural light in a temperature controlled environmental chamber (EC)...
April 26, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28421106/the-synergistic-responses-of-different-photoprotective-pathways-in-dwarf-bamboo-fargesia-rufa-to-drought-and-subsequent-rewatering
#7
Chenggang Liu, Yanjie Wang, Kaiwen Pan, Qingwei Wang, Jin Liang, Yanqiang Jin, Akash Tariq
Dwarf bamboo-dominated forests are often subjected to temporary periods of drought due to rising air temperature and decreasing rainfall. Nevertheless, the relationship among CO2 assimilation, photoprotective pathways and metabolism of reactive oxygen species (ROS) remains unexplored in bamboo species. Changes in leaf gas exchange, chlorophyll fluorescence, energy partitioning, antioxidative system and compounds related to ROS metabolism in Fargesia rufa plants subjected to drought and subsequent rewatering were analyzed...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28358623/one-target-two-mechanisms-the-impact-of-candidatus-liberibacter-asiaticus-and-its-vector-diaphorina-citri-on-citrus-leaf-pigments
#8
Nabil Killiny, Yasser Nehela
Huanglongbing is currently the largest threat to global citrus production. We examined the effect of HLB pathogen, Candidatus Liberibacter asiaticus-infection and/or its vector, Diaphorina citri-infestation on Valencia sweet orange leaf pigments using HPLC, followed by gene expression analysis for 46 involved genes in carotenoids- and chlorophylls-biosynthesis pathways. Both CLas and D. citri alter the total citrus leaf pigments balance with a greater impact by CLas. While zeaxanthin was accumulated in CLas-infected leaves, chlorophyllide a was increased in D...
March 30, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28341348/the-impact-of-oral-polypodium-leucotomos-extract-on-ultraviolet-b-response-a-human-clinical-study
#9
Indermeet Kohli, Rubina Shafi, Prescilia Isedeh, James L Griffith, Mohammed S Al-Jamal, Narumol Silpa-Archa, Bradford Jackson, Mohammed Athar, Nikiforos Kollias, Craig A Elmets, Henry W Lim, Iltefat H Hamzavi
BACKGROUND: There is a rationale for adding systemic photoprotective agents to the current photoprotection regimen. OBJECTIVE: This study was designed to objectively evaluate the molecular and photobiologic effects of oral administration of Polypodium leucotomos extract (PLE). METHODS: In all, 22 subjects with Fitzpatrick skin phototype I to III were enrolled. On day 1, subjects were irradiated with visible light, ultraviolet (UV) A1, and UVB (using 308-nm excimer laser)...
March 21, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28260501/in-vitro-skin-models-for-the-evaluation-of-sunscreen-based-skin-photoprotection-molecular-methodologies-and-opportunities
#10
Françoise Bernerd, Claire Marionnet
Identifying and understanding the biological events that occur following ultraviolet (UV) exposure are mandatory to elucidate the biological and clinical consequences of sun exposure, and to provide efficient and adequate photoprotection strategies. The main UV-induced biological features (markers related to sunburn, cancer, photoaging immunosuppression, pigmentation), characterized in human skin in vivo, could be reproduced in adapted models of reconstructed skin in vitro, attesting their high relevance in the field of photobiology...
March 3, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28257901/effect-of-florfenicol-and-thiamphenicol-exposure-on-the-photosynthesis-and-antioxidant-system-of-microcystis-flos-aquae
#11
Meixian Wang, Yuxuan Zhang, Peiyong Guo
Florfenicol (FF) and thiamphenicol (TAP) are two typical pharmaceuticals used widely as therapeutica antibiotic agents in aquaculture. However, little is known about the potential adverse effects of these two antibiotics on non-target organisms in the aquatic ecosystem. In this study we investigated the effects of FF and TAP on photosynthesis and the antioxidant system of the cyanobacteria Microcystis flos-aquae. Over a concentration range of 0.001-1μg/L, the results showed that both FF and TAP significantly increased the chlorophyll a content of M...
February 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28153924/correlations-between-circadian-rhythms-and-growth-in-challenging-environments
#12
Yuri Dakhiya, Duaa Hussien, Eyal Fridman, Moshe Kiflawi, Rachel Green
In plants, the circadian system controls a plethora of processes, many with agronomic importance, such as photosynthesis, photoprotection, stomatal opening, and photoperiodic development, as well as molecular processes, such as gene expression. It has been suggested that modifying circadian rhythms may be a means to manipulate crops to develop improved plants for agriculture. However, there is very little information on how the clock influences the performance of crop plants. We used a noninvasive, high-throughput technique, based on prompt chlorophyll fluorescence, to measure circadian rhythms and demonstrated that the technique works in a range of plants...
March 2017: Plant Physiology
https://www.readbyqxmd.com/read/28007953/the-function-of-lhcbm4-6-8-antenna-proteins-in-chlamydomonas-reinhardtii
#13
Laura Girolomoni, Paola Ferrante, Silvia Berteotti, Giovanni Giuliano, Roberto Bassi, Matteo Ballottari
In eukaryotic autotrophs, photosystems are composed of a core moiety, hosting charge separation and electron transport reactions, and an antenna system, enhancing light harvesting and photoprotection. In Chlamydomonas reinhardtii, the major antenna of PSII is a heterogeneous trimeric complex made up of LHCBM1-LHCBM9 subunits. Despite high similarity, specific functions have been reported for several members including LHCBM1, 2, 7, and 9. In this work, we analyzed the function of LHCBM4 and LHCBM6 gene products in vitro by synthesizing recombinant apoproteins from individual sequences and refolding them with pigments...
January 1, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27990574/differences-in-photosynthetic-responses-of-nadp-me-type-c4-species-to-high-light
#14
Elżbieta Romanowska, Alicja Buczyńska, Wioleta Wasilewska, Tomasz Krupnik, Anna Drożak, Paweł Rogowski, Eugeniusz Parys, Maksymilian Zienkiewicz
Three species chosen as representatives of NADP-ME C4 subtype exhibit different sensitivity toward photoinhibition, and great photochemical differences were found to exist between the species. These characteristics might be due to the imbalance in the excitation energy between the photosystems present in M and BS cells, and also due to that between species caused by the penetration of light inside the leaves. Such regulation in the distribution of light intensity between M and BS cells shows that co-operation between both the metabolic systems determines effective photosynthesis and reduces the harmful effects of high light on the degradation of PSII through the production of reactive oxygen species (ROS)...
March 2017: Planta
https://www.readbyqxmd.com/read/27990150/transcriptional-regulation-of-tetrapyrrole-biosynthesis-in-arabidopsis-thaliana
#15
REVIEW
Koichi Kobayashi, Tatsuru Masuda
Biosynthesis of chlorophyll (Chl) involves many enzymatic reactions that share several first steps for biosynthesis of other tetrapyrroles such as heme, siroheme, and phycobilins. Chl allows photosynthetic organisms to capture light energy for photosynthesis but with simultaneous threat of photooxidative damage to cells. To prevent photodamage by Chl and its highly photoreactive intermediates, photosynthetic organisms have developed multiple levels of regulatory mechanisms to coordinate tetrapyrrole biosynthesis (TPB) with the formation of photosynthetic and photoprotective systems and to fine-tune the metabolic flow with the varying needs of Chl and other tetrapyrroles under various developmental and environmental conditions...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27919227/high-light-stress-triggers-distinct-proteomic-responses-in-the-marine-diatom-thalassiosira-pseudonana
#16
Hong-Po Dong, Yue-Lei Dong, Lei Cui, Srinivasan Balamurugan, Jian Gao, Song-Hui Lu, Tao Jiang
BACKGROUND: Diatoms are able to acclimate to frequent and large light fluctuations in the surface ocean waters. However, the molecular mechanisms underlying these acclimation responses of diaotms remain elusive. RESULTS: In this study, we investigated the mechanism of high light protection in marine diatom Thalassiosira pseudonana using comparative proteomics in combination with biochemical analyses. Cells treated under high light (800 μmol photons m(-2)s(-1)) for 10 h were subjected to proteomic analysis...
December 5, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27801906/a-novel-mechanism-for-host-mediated-photoprotection-in-endosymbiotic-foraminifera
#17
Katherina Petrou, Peter J Ralph, Daniel A Nielsen
Light underpins the health and function of coral reef ecosystems, where symbiotic partnerships with photosynthetic algae constitute the life support system of the reef. Decades of research have given us detailed knowledge of the photoprotective capacity of phototrophic organisms, yet little is known about the role of the host in providing photoprotection in symbiotic systems. Here we show that the intracellular symbionts within the large photosymbiotic foraminifera Marginopora vertebralis exhibit phototactic behaviour, and that the phototactic movement of the symbionts is accomplished by the host, through rapid actin-mediated relocation of the symbionts deeper into the cavities within the calcium carbonate test...
February 2017: ISME Journal
https://www.readbyqxmd.com/read/27755972/the-purple-trp288ala-mutant-of-synechocystis-ocp-persistently-quenches-phycobilisome-fluorescence-and-tightly-interacts-with-frp
#18
Nikolai N Sluchanko, Konstantin E Klementiev, Evgeny A Shirshin, Georgy V Tsoraev, Thomas Friedrich, Eugene G Maksimov
In Cyanobacteria, the Orange Carotenoid Protein (OCP) and Fluorescence Recovery Protein (FRP) are central to the photoprotective mechanism consisting in regulated quenching of phycobilisome (PBs) fluorescence. Due to a transient and flexible nature of the light-activated red quenching form, OCP(R), which is obtained from the stable dark-adapted orange form, OCP(O), by photoconversion, the detailed mechanism of photoprotection remains unclear. Here we demonstrate that our recently described W288A mutant of the Synechocystis OCP (hereinafter called OCP(W288A)) is a fully functional analogue of the OCP(R) form which is capable of constitutive PBs fluorescence quenching in vitro with no need of photoactivation...
January 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27745642/understanding-photodermatoses-associated-with-defective-dna-repair-photosensitive-syndromes-without-associated-cancer-predisposition
#19
REVIEW
Yik Weng Yew, Cerrene N Giordano, Graciela Spivak, Henry W Lim
Photodermatoses associated with defective DNA repair are a group of photosensitive hereditary skin disorders. In this review, we focus on diseases and syndromes with defective nucleotide excision repair that are not accompanied by an increased risk of cutaneous malignancies despite having photosensitivity. Specifically, the gene mutations and transcription defects, epidemiology, and clinical features of Cockayne syndrome, cerebro-oculo-facial-skeletal syndrome, ultraviolet-sensitive syndrome, and trichothiodystrophy will be discussed...
November 2016: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/27719922/drug-in-cyclodextrin-in-liposomes-as-a-carrier-system-for-volatile-essential-oil-components-application-to-anethole
#20
Riham Gharib, Lizette Auezova, Catherine Charcosset, Hélène Greige-Gerges
A combined approach based on cyclodextrin/drug inclusion complex formation and loading into liposomes was applied to improve the effectiveness of liposome loading with essential oils. Hydroxypropyl-β-cyclodextrin/ANE (HP-β-CD/ANE) inclusion complexes were prepared and encapsulated into liposomes (ACL). ANE-double-loaded liposomes (ACL2) were obtained with the HP-β-CD/ANE complex in the aqueous phase and ANE in the organic phase. Liposomes were prepared from saturated (Phospholipon 90H) or unsaturated (Lipoid S100) phospholipids and characterized for size, polydispersity index, zeta potential, morphology, loading rate (LR) and photo- and storage stabilities...
March 1, 2017: Food Chemistry
keyword
keyword
110468
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"