keyword
https://read.qxmd.com/read/38430582/comparison-of-physiological-and-transcriptome-responses-of-corals-to-strong-light-and-high-temperature
#1
JOURNAL ARTICLE
Shuwen Jia, Xiaoxiao Geng, Zefu Cai, Yi Wang, Jie Shen, Yuanchao Li, Zhongjie Wu, Shiquan Chen, Daoru Wang
Coral reefs are essential for marine ecology and biodiversity. Global climate change has resulted in severe coral reef degradation, partly via coral bleaching, which is caused by rising sea temperatures and solar light intensity. In this study, we examined the impact of strong light (300 µmol.m-2 .s-1 ) and high temperature (33°C) on the growth, immunity, and gene expression of Galaxea fascicularis. Strong light caused coral bleaching in the absence of high sea temperatures, while no obvious bleaching was observed under high temperature alone...
March 1, 2024: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/38371984/comparison-of-in-office-and-at-home-bleaching-techniques-an-umbrella-review-of-efficacy-and-post-operative-sensitivity
#2
JOURNAL ARTICLE
Maria Aidos, Carlos Miguel Marto, Inês Amaro, Mariangela Cernera, Inês Francisco, Francisco Vale, Manuel Marques-Ferreira, Bárbara Oliveiros, Gianrico Spagnuolo, Eunice Carrilho, Ana Coelho, Anabela Baptista Paula
OBJECTIVES: The objective of this umbrella review is to evaluate the efficacy and adverse effects of different teeth whitening techniques in-office (IO) and at-home (AH), regarding chromatic changes and teeth sensitivity. MATERIALS AND METHODS: The search was carried out from several databases. The included studies were all systematic reviews with or without meta-analysis of RCT or quasi-RCT. The participants were patients that underwent external dental bleaching in permanent vital teeth...
February 15, 2024: Heliyon
https://read.qxmd.com/read/38367067/evaluation-of-tooth-color-change-after-a-bleaching-process-with-different-lasers
#3
JOURNAL ARTICLE
Danny Möbius, Andreas Braun, Rene Franzen
The aim of this in vitro study was to evaluate the efficiency of diode laser-activated bleaching systems for color change of teeth. 75 extracted teeth were studied in five different bleaching protocols. Group 1: diode laser 445 nm, 320 µm fiber, 0.5W, continuous wave mode, dose 53 J/cm2 . Group 2: diode laser 970 nm, 320 µm fiber, 1W, continuous wave mode, dose 106.10 J/cm2 . Group 3: diode laser 940 nm, bleaching handpiece, 7W, continuous wave mode, dose 105 J/cm2 ...
February 17, 2024: Odontology
https://read.qxmd.com/read/38358426/highly-efficient-inverted-light-emitting-diodes-based-on-vertically-aligned-cdse-cds-nanorod-layers-fabricated-by-electrophoretic-deposition
#4
JOURNAL ARTICLE
Yongliang Zhang, Xuan-Manh Pham, Thomas Keating, Na Jia, Anthony Mullen, Devika Laishram, Mei-Yan Gao, Brian Corbett, Pai Liu, Xiao Wei Sun, Tewfik Soulimane, Christophe Silien, Kevin M Ryan, Zhenhui Ma, Ning Liu
Inverted colloidal-nanocrystal-based LEDs (NC-LEDs) are highly interesting and invaluable for large-scale display technology and flexible electronics. Semiconductor nanorods (NRs), in addition to the tunable wavelengths of the emitted light (achieved, for example, by the variation of the NR diameter or the diameter of core in a core-shell configuration), also exhibit linearly polarized emission, a larger Stokes shift, faster radiative decay, and slower bleaching kinetics than quantum dots (QDs). Despite these advantages, it is difficult to achieve void-free active NR layers using simple spin-coating techniques...
February 15, 2024: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/38315349/an-emerging-ophthalmology-challenge-a-narrative-review-of-tiktok-trends-impacting-eye-health-among-children-and-adolescents
#5
REVIEW
Sally Al Hassan, Alaa Bou Ghannam, Joanna S Saade
In today's digital age, children and teenagers are deeply entrenched in the world of personal electronic devices including laptops, tablets, and smartphones. These serve as gateways to captivate online content. With children as young as 4 years old having access to these gadgets, the potential benefits of technology coexist with many possible risks. One such risk is the growing global issue of myopia. TikTok, a mobile application that gained immense popularity since its inception in 2016, has garnered 1...
February 5, 2024: Ophthalmology and Therapy
https://read.qxmd.com/read/38307159/the-carbonyl-group-in-%C3%AE-2-of-the-carotenoid-tunes-the-photocycle-kinetics-in-orange-carotenoid-protein
#6
JOURNAL ARTICLE
Volha U Chukhutsina, Christopher D M Hutchison, Jasper J van Thor
Adaptation to rapid environmental changes is crucial for maintaining optimal photosynthetic efficiency and is ultimately key to the survival of all photosynthetic organisms. Like most of them, cyanobacteria protect their photosynthetic apparatus against rapidly increasing light intensities by nonphotochemical quenching (NPQ). In cyanobacteria, NPQ is controlled by Orange Carotenoid Protein (OCP) photocycle. OCP is the only known photoreceptor that uses carotenoid for its light activation. How carotenoid drives and controls this unique photoactivation process is still unknown...
January 31, 2024: Journal of Molecular Biology
https://read.qxmd.com/read/38298717/green-3-a-green-extraction-of-green-additives-for-green-plastics
#7
JOURNAL ARTICLE
Vera Muccilli, Anna E Maccarronello, Carolle Rasoanandrasana, Nunzio Cardullo, Martina S de Luna, Maria G G Pittalà, Paolo M Riccobene, Sabrina C Carroccio, Andrea A Scamporrino
PLA/PBAT bioplastic is a commercial biodegradable plastic employed for packaging and several food and agriculture applications. In this regard, properties such as the antioxidant ability to extend food shelf life and light resistance, are of great interest in the production of packaging and mulching films, respectively. These features are obtained by developing blends with pure chemicals and/or natural products as additives. In the present work blend formulations of PLA/PBAT with a walnut shell extract rich in antioxidants were developed and evaluated for their properties in comparison with classic PLA/PBAT...
January 30, 2024: Heliyon
https://read.qxmd.com/read/38130089/effect-of-antioxidant-on-tooth-sensitivity-after-bleaching
#8
JOURNAL ARTICLE
Mohamed Nabil, Mostafa Mohamed Hasan, Eman Abd Elghany Shebl
OBJECTIVES: This study aimed to investigate the effect of antioxidant (sodium ascorbate) on tooth sensitivity after two in-office bleaching techniques (light-activated and chemical bleaching). MATERIALS AND METHODS: Ten patients aged 18-25 were bleached in four groups according to bleaching materials and/or antioxidant used. Group A: Maxillary right quadrant received light-activated bleaching with antioxidant. Group B: Maxillary left quadrant received light-activated bleaching without antioxidant...
December 21, 2023: Journal of Esthetic and Restorative Dentistry
https://read.qxmd.com/read/37996910/a-coral-associated-actinobacterium-mitigates-coral-bleaching-under-heat-stress
#9
JOURNAL ARTICLE
Jie Li, Yiyang Zou, Qiqi Li, Jian Zhang, David G Bourne, Yuanjiao Lyu, Cong Liu, Si Zhang
BACKGROUND: The positive effects of exposing corals to microorganisms have been reported though how the benefits are conferred are poorly understood. Here, we isolated an actinobacterial strain (SCSIO 13291) from Pocillopora damicornis with capabilities to synthesize antioxidants, vitamins, and antibacterial and antiviral compounds supported with phenotypic and/or genomic evidence. Strain SCSIO 13291 was labeled with 5 (and - 6)-carboxytetramethylrhodamine, succinimidyl ester and the labeled cell suspension directly inoculated onto the coral polyp tissues when nubbins were under thermal stress in a mesocosm experiment...
November 23, 2023: Environmental microbiome
https://read.qxmd.com/read/37994345/the-multistable-melanopsins-of-mammals
#10
JOURNAL ARTICLE
Alan J Emanuel, Michael Tri H Do
Melanopsin is a light-activated G protein coupled receptor that is expressed widely across phylogeny. In mammals, melanopsin is found in intrinsically photosensitive retinal ganglion cells (ipRGCs), which are especially important for "non-image" visual functions that include the regulation of circadian rhythms, sleep, and mood. Photochemical and electrophysiological experiments have provided evidence that melanopsin has at least two stable conformations and is thus multistable, unlike the monostable photopigments of the classic rod and cone photoreceptors...
2023: Front Ophthalmol (Lausanne)
https://read.qxmd.com/read/37984583/bio-based-active-packaging-gallic-acid-modified-agarose-coatings-in-grass-carp-ctenopharyngodon-idellus-preservation
#11
JOURNAL ARTICLE
Liling Fu, Qiong Xiao, Yi Ru, Qinglin Hong, Huifen Weng, Yonghui Zhang, Jun Chen, Anfeng Xiao
Antioxidant and antimicrobial agarose coatings were developed by grafting gallic acid through the carbodiimide coupling method. Structural characterization revealed that the carboxyl group of gallic acid was successfully grafted onto the C6-OH of D-galactose in agarose, with the highest observed grafting ratio being 13.73 %. The grafting of gallic acid significantly increased the antioxidant and bacteriostatic activities of the agarose. As the grafting ratio of gallic acid-modified agarose (GaAg) increased from 0 to 13...
November 18, 2023: International Journal of Biological Macromolecules
https://read.qxmd.com/read/37897242/chiroptical-switching-of-electrochromic-polymer-thin-films
#12
JOURNAL ARTICLE
Inho Song, Liyan You, Ke Chen, Won-June Lee, Jianguo Mei
The interaction between light and chiroptical polymers plays a crucial role in chiroptics, spintronics, and chiral-spin selectivity. Despite considerable successes in creating dissymmetric polymer films, the elucidation of chiroptical activities under electrochemical switching remains unexplored. Here we report homogeneous chiral electrochromics using chiral assembly of conjugated polymers through a transient solidification process with molecular chiral templates. In their neutral state, the chiral electrochromic polymers directly produce a remarkably dissymmetric polarization-dependent transmittance...
October 28, 2023: Advanced Materials
https://read.qxmd.com/read/37890740/isolation-and-characterization-of-microcrystalline-cellulose-from-an-agro-waste-tamarind-tamarindus-indica-seeds-and-its-suitability-investigation-for-biofilm-formulation
#13
JOURNAL ARTICLE
Divya Divakaran, Indran Suyambulingam, M R Sanjay, Vijay Raghunathan, Vinod Ayyappan, Suchart Siengchin
The exploration of potential bio-fillers for bio-film application is a promising approach to ensure biodegradable, eco-friendly, good-quality materials with high-performance applications. This is a comprehensive study executed to establish the utility of an agro-waste Tamarindus indica seeds for microcrystalline cellulose production and to assess its feasibility for biofilm fabrication. The extraction was carried out through consecutive chemical-mediated alkalization, acid hydrolysis and bleaching. The isolated microcrystalline cellulose from Tamarindus indica seeds (TSMCC) was characterized through chemical, thermal and morphological characterization to validate the cellulose contribution, thermal resistance, and compatibility of the material...
October 25, 2023: International Journal of Biological Macromolecules
https://read.qxmd.com/read/37882797/integrated-metagenomic-and-metaproteomic-analyses-reveal-bacterial-micro-ecological-mechanisms-in-coral-bleaching
#14
JOURNAL ARTICLE
Keke Cheng, Xinyang Li, Mengmeng Tong, Mui-Choo Jong, Zhonghua Cai, Huina Zheng, Baohua Xiao, Jin Zhou
Coral bleaching has been rapidly increasing in recent years due to abnormally elevated temperature, leading to massive damage to coral reefs worldwide. Understanding the processes and micro-ecological mechanisms of coral symbionts in response to bleaching is crucial as evidence accumulates that micro-organisms (particularly the bacteria) contribute to the health and recovery of coral, especially during heat stress. However, the exact functional mechanism of bacteria has not yet been fully elucidated. In this study, we performed metagenomic and metaproteomic analyses of healthy and bleached Acropora muricata corals to identify taxonomic and functional shifts in coral symbionts during a natural thermal bleaching event on Hainan Island...
October 26, 2023: MSystems
https://read.qxmd.com/read/37882618/investigating-intramolecular-h-atom-transfer-dynamics-in-%C3%AE-diketones-with-ultrafast-infrared-spectroscopies-and-theoretical-modeling
#15
JOURNAL ARTICLE
Jessika L S Dean, Valerie S Winkler, Mark A Boyer, Edwin L Sibert, Joseph A Fournier
The vibrational signatures and ultrafast dynamics of the intramolecular H-bond in a series of β-diketones are investigated with 2D IR spectroscopy and computational modeling. The chosen β-diketones exhibit a range of H atom donor-acceptor distances and asymmetry along the H atom transfer coordinate that tunes the intramolecular H-bond strength. The species with the strongest H-bonds are calculated to have very soft H atom potentials, resulting in highly red-shifted OH stretch fundamental frequencies and dislocation of the H atom upon vibrational excitation...
October 26, 2023: Journal of Physical Chemistry. A
https://read.qxmd.com/read/37857737/negative-phototaxis-in-the-photosymbiotic-sea-anemone-aiptasia-as-a-potential-strategy-to-protect-symbionts-from-photodamage
#16
JOURNAL ARTICLE
Mariko Kishimoto, Sebastian G Gornik, Nicholas S Foulkes, Annika Guse
Photosymbiotic cnidarians generally seek bright environments so that their symbionts can be photosynthetically active. However, excess light may result in a breakdown of symbiosis due to the accumulation of photodamage in symbionts causing symbiont loss (bleaching). It is currently unknown if photosymbiotic cnidarians sense light only to regulate spawning time and to facilitate predation, or whether they also use their light-sensing capacities to protect their symbionts from photodamage. In this study, we examined how the sea anemone Aiptasia changes its behaviour when exposed to excess light...
October 19, 2023: Scientific Reports
https://read.qxmd.com/read/37848653/physiological-and-biochemical-responses-of-soft-coral-sarcophyton-trocheliophorum-to-doxycycline-hydrochloride-exposure
#17
JOURNAL ARTICLE
Wenxin Xu, Waqas Ahmed, Mohsin Mahmood, Weidong Li, Sajid Mehmood
In light of the rapid expansion of the marine aquaculture industry, there has been widespread and irregular usage of aquatic drugs to combat biological diseases, which significantly impact the neighboring aquatic ecosystems. This study delves into the impact of the antibiotic aquatic drug known as doxycycline hydrochloride (DOX) on offshore soft corals, providing valuable data for the responsible use and management of aquatic drugs. In this investigation, we subjected Sarcophyton trocheliophorum to acute exposure to varying concentrations of DOX (0, 1, 5, and 10 mg L-1 )...
October 17, 2023: Scientific Reports
https://read.qxmd.com/read/37757999/the-photic-blink-reflex-as-an-index-of-photophobia
#18
REVIEW
Steven A Hackley, Lenworth N Johnson
Two recent studies of eye closure triggered by intense luminance increase suggest that this behavior reflects the melanopsin-based retinal activity known to underlie photophobia, the pathological aversion to light (Kardon, 2012; Kaiser et al., 2021). Early studies of the photic blink reflex (PBR) are reviewed to help guide future research on this possible objective index of photophobia. Electromyographic recordings of the lid-closure muscle, orbicularis oculi, reveal distinct bursts with typical onset latencies of 50 and 80 ms, R50 and R80, respectively...
September 25, 2023: Biological Psychology
https://read.qxmd.com/read/37749870/synthesis-and-photochromic-properties-of-diaryl-5-helicene-derivatives
#19
JOURNAL ARTICLE
Ruiji Li, Qi Fang, Minghui Chen, Mihoko Yamada, Yugo Tsuji, Yusuke Kugai, Wei Li, Tsuyoshi Kawai
Photoinduced tuning of aromaticity and correlative molecular properties has attracted enormous interest in recent years for both modulating photochromism properties and designing novel photochromic materials. Here, we report on the synthesis and photochemical characterizations investigation of diaryl[5]helicene based diarylethene molecular switches. 3,4-Bis(2,4-dimethyl-5-phenylthiophen-3-yl)dibenzo[c,g]phenanthrene derivative 1a showed no photochromic reaction, while 3,4-bis(2-methyl-5-phenylthiophen-3-yl)dibenzo[c,g]phenanthrene derivative 2a and 3,4-bis(5-methyl-2-phenylthiazol-4-yl)dibenzo[c,g]phenanthrene derivative 3a exhibited reversible photochromism in different aprotic solvents with specific light irradiation...
September 25, 2023: Chemistry: a European Journal
https://read.qxmd.com/read/37706865/evaluation-of-the-laser-wavelength-role-on-tooth-bleaching-in-terms-of-color-change-roughness-and-microhardness-with-pulpal-rapid-temperature-monitoring-an-in-vitro-study
#20
JOURNAL ARTICLE
Raneen Kh Al-Hamd, Abdulhadi Al-Janabi
This in-vitro study evaluates the efficacy of the teeth bleaching approach using different laser wavelengths (405 nm blue diode, 940 nm infrared diode, and Er,Cr:YSGG 2780 nm lasers) in comparison to the conventional method using light-emitting diode (LED) sources (420-480) nm. Eighty caries-free sound human premolars were randomly divided into four groups ( N =20). Each group received a different bleaching procedure. Then each group was further subdivided into two subgroups ( N =10) stained with different solutions...
July 10, 2023: Applied Optics
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