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Artificial Light

Claudio De Liberato, Federica Berrilli, Teresa Bossù, Adele Magliano, Margherita Montalbano Di Filippo, David Di Cave, Mariano Sigismondi, Annunziata Cannavacciuolo, Paola Scaramozzino
Swimmer's itch is caused by the penetration of free-swimming larvae of trematodes of the family Schistosomatidae in human skin. It is usually reported in people engaged in recreational water activities in freshwater bodies and in most of cases, it is provoked by bird schistosomes of the genus Trichobilharzia. In the summer 2017, many cases of dermatitis were recorded in people bathing in the waters of the Albano Lake (Rome, Italy) and a parasitological investigation was carried out in order to ascertain the causative agent of these cases...
February 19, 2019: Zoonoses and Public Health
Yanning Chen, Chenmin Yao, Cui Huang, Yake Wang
STATEMENT OF PROBLEM: Although newly developed photoinitiators can make up for the limitations of camphorquinone, their absorption spectra are different. However, little attention has been paid to the compatibility of available wavelength spectra of light-polymerization units (LPUs) and photoinitiators within resin cements. PURPOSE: The purpose of this in vitro study was to evaluate the effect of monowave and polywave light-emitting diode (LED) units on the adhesion of dual-polymerizing self-adhesive resin cements to monolithic zirconia...
February 16, 2019: Journal of Prosthetic Dentistry
Moeto Nagai, Takahiro Hirano, Takayuki Shibata
The sensing and actuation capabilities of biological cells integrated with artificial components have been used to create autonomous microsystems. For creating autonomous microsystems, the unidirectional transport of a submillimeter-sized cargo with stimuli responsive bio-motors should be developed as a fundamental motion. This study aims to use Volvox as a light-controlled microrobot to achieve the unidirectional transport of a submillimeter-sized cargo. We show the fabrication of a guide structure, cargo, and light irradiation platform for a unidirectional actuation...
February 16, 2019: Micromachines
Alexander Ryabchun, Dmitry Yakovlev, Alexey Bobrovsky, Nathalie Katsonis
The future of adaptive materials will rely on efficient transducing molecular motion across increasing length scales, up to the macroscopic and functional level. In this context, liquid crystals have emerged as a promising amplification medium, in view their long range order and high sensitivity to external stimuli, and in particular chiral liquid crystals have demonstrated widely tunable optical properties and invertible chirality. Here, we demonstrate that by applying weak electric fields, regular, periodic and light-tunable patterns can be formed spontaneously in cholesteric liquid crystal...
February 19, 2019: ACS Applied Materials & Interfaces
Kai Xiao, Lu Chen, Ruotian Chen, Tobias Heil, Saul Daniel Cruz Lemus, Fengtao Fan, Liping Wen, Lei Jiang, Markus Antonietti
The original version of this Article contained errors in Figure 3. In Fig. 3d, the label 'With light irradiation' was originally incorrectly given as 'Without light irradiation'. In Fig. 3f, the label 'Without light irradiation' was originally incorrectly given as 'With light irradiation'. This has been corrected in both the PDF and HTML versions of the Article.
February 14, 2019: Nature Communications
Maha Usama Abdelhaseib, Atul K Singh, Arun K Bhunia
AIM: To investigate the use of a light scattering sensor, BARDOT (BActerial Rapid Detection using Optical scattering Technology) coupled with a multi-pathogen selective medium, SEL (Salmonella, Escherichia, and Listeria) for concurrent detection of the three major foodborne pathogens in a single assay. METHODS AND RESULTS: BARDOT was used to detect and distinguish the three major pathogens, Salmonella enterica, Shiga-toxin producing Escherichia coli (STEC) and Listeria monocytogenes from food based on colony scatter signature patterns on SEL agar (SELA)...
February 14, 2019: Journal of Applied Microbiology
Suqing Zheng, Wenping Chang, Wenxin Xu, Yong Xu, Fu Lin
Artificial sweeteners (AS) can elicit the strong sweet sensation with the low or zero calorie, and are widely used to replace the nutritive sugar in the food and beverage industry. However, the safety issue of current AS is still controversial. Thus, it is imperative to develop more safe and potent AS. Due to the costly and laborious experimental-screening of AS, in-silico sweetener/sweetness prediction could provide a good avenue to identify the potential sweetener candidates before experiment. In this work, we curate the largest dataset of 530 sweeteners and 850 non-sweeteners, and collect the second largest dataset of 352 sweeteners with the relative sweetness (RS) from the literature...
2019: Frontiers in Chemistry
Li-Jun Xie, Xiao-Ti Yang, Rui-Li Wang, Hou-Ping Cheng, Zhi-Yan Li, Li Liu, Lan-Qun Mao, Ming Wang, Liang Cheng
N6-Methyladenosine (m6A) represents a common and highly dynamic modification in eukaryotic RNA that affects various cellular pathways. Natural dioxygenases such as FTO and ALKBH5 are enzymes that demethylate m6A residues in mRNA. Herein, the first identification of a small-molecule modulator that functions as an artificial m6A demethylase was reported. Flavin mononucleotide (FMN), the metabolite produced by riboflavin kinase, undergoes substantial photochemical demethylation of m6A residues of RNA in live cells...
February 12, 2019: Angewandte Chemie
Manuel Spitschan
No abstract text is available yet for this article.
February 2019: Nature
Xiumei Li, Shanpeng Qiao, Linlu Zhao, Shengda Liu, Fei Li, Feihu Yang, Quan Luo, Chunxi Hou, Jiayun Xu, Junqiu Liu
Using biological materials for light-harvesting applications has attracted considerable attention in recent years. Such materials provide excellent environmental compatibility and often exhibit superior properties over synthetic materials. Herein, inspired by the outstanding energy transfer performance in coelenterates, we constructed a template-free, highly ordered 2D light-harvesting system by covalent-induced co-assembly of EBFP2 (donor) and EGFP (acceptor), in which the fluorescent chromophores were well distributed and adopted a fixed orientation...
February 12, 2019: ACS Nano
Sahar Agbaria, Abraham Haim, Fuad Fares, Abed E Zubidat
Currently, one of the most disputed hypotheses regarding breast cancer (BC) development is exposure to short wavelength artificial light at night (ALAN) as multiple studies suggest a possible link between them. This link is suggested to be mediated by nocturnal melatonin suppression that plays an integral role in circadian regulations including cell division. The objective of the research was to evaluate effects of 1 × 30 min/midnight ALAN (134 µ Wcm-2 , 460 nm) with or without nocturnal melatonin supplement on tumor development and epigenetic responses in 4T1 tumor-bearing BALB/c mice...
February 12, 2019: Chronobiology International
Morgane Touzot, Loïc Teulier, Thierry Lengagne, Jean Secondi, Marc Théry, Paul-Antoine Libourel, Ludovic Guillard, Nathalie Mondy
The presence of artificial light at night (ALAN) is currently a global phenomenon. By altering the photoperiod, ALAN may directly affect the physiology and behaviour of many organisms, such as the timing of daily rhythms, hormonal regulation, food intake, metabolism, migration and reproduction. Surprisingly while it is known that ALAN exposure strongly influences health of humans and laboratory animals, studies on wildlife remain scarce. Amphibians are one of the most nocturnal groups of vertebrates and exhibit an unfavourable conservation status in most parts of the world...
2019: Conservation Physiology
Mathilde Fontaine, Yohann Clement, Nicolas Blanc, Claire Demesmay
European restriction limits the hexavalent chromium content to not more than 3 mg/kg in leather products. Owing to the evolution of hexavalent chromium content in leathers over time, it's difficult to guarantee the products will be harmless for consumers. The designing of an accelerated and representative artificial ageing procedure is therefore highly desirable. This article proposes a thorough study of the influence of storage conditions on the formation of hexavalent chromium in 4 bovine leathers. A factorial design of experiment was built with the following factors: temperature of 40-80 °C, relative humidity of 20-50%, presence or not of UV and exposure duration of 24-48 h...
January 11, 2019: Journal of Hazardous Materials
Kai Wang, Shilei Dai, Yiwei Zhao, Yan Wang, Chuan Liu, Jia Huang
Implementation of artificial intelligent systems with light-stimulated synaptic emulators may enhance computational speed by providing devices with high bandwidth, low power computation requirements, and low crosstalk. One of the key challenges is to develop light-stimulated devices that can response to light signals in a neuron-/synapse-like fashion. A simple and effective solution process to fabricate light-stimulated synaptic transistors (LSSTs) based on inorganic halide perovskite quantum dots (IHP QDs) and organic semiconductors (OSCs) is reported...
February 10, 2019: Small
Roman V Kazantsev, Adam Dannenhoffer, Taner Aytun, Boris Harutyunyan, Daniel J Fairfield, Michael J Bedzyk, Samuel I Stupp
Supramolecular light-absorbing nanostructures are useful building blocks for the design of next-generation artificial photosynthetic systems. Development of such systems requires a detailed understanding of how molecular packing influences the material's optoelectronic properties. We describe a series of crystalline supramolecular nanostructures in which the substituents on their monomeric units strongly affects morphology, ordering kinetics, and exciton behavior. By designing constitutionally-isomeric perylene monoimide (PMI) amphiphiles, the effect of side chain sterics on nanostructure crystallization was studied...
July 12, 2018: Chem
Javier Gallego-Bartolomé, Wanlu Liu, Peggy Hsuanyu Kuo, Suhua Feng, Basudev Ghoshal, Jason Gardiner, Jenny Miao-Chi Zhao, Soo Young Park, Joanne Chory, Steven E Jacobsen
The RNA-directed DNA methylation (RdDM) pathway in plants controls gene expression via cytosine DNA methylation. The ability to manipulate RdDM would shed light on the mechanisms and applications of DNA methylation to control gene expression. Here, we identified diverse RdDM proteins that are capable of targeting methylation and silencing in Arabidopsis when tethered to an artificial zinc finger (ZF-RdDM). We studied their order of action within the RdDM pathway by testing their ability to target methylation in different mutants...
January 31, 2019: Cell
Andrey Kostin, Aftab Alam, Dennis McGinty, Ronald Szymusiak, Noor Alam
Aging is associated with sleep-wake disruption, dampening of circadian amplitudes, and a reduced homeostatic sleep response. Aging is also associated with a decline in hypothalamic cell proliferation. We hypothesized that the aging-related decline in cell-proliferation contributes to the dysfunction of preoptic-hypothalamic sleep-wake and circadian systems and consequent sleep-wake disruption. We determined if cytosine-β-D-arabinofuranoside (AraC), an antimitotic agent known to suppress hypothalamic cell-proliferation and neurogenesis, causes sleep-wake instability in young mice...
February 7, 2019: Neuroscience
Elif Senem Köksal, Patrícia F Belletati, Ganna Reint, Ragni Olsson, Kira D Leitl, Ilayda Kantarci, Irep Gözen
We present a convenient method to form a bottom-up structural organelle model for the endoplasmic reticulum (ER). The model consists of highly dense lipidic nanotubes that are, in terms of morphology and dynamics, reminiscent of ER. The networks are derived from phospholipid double bilayer membrane patches adhering to a transparent Al2O3 substrate. The adhesion is mediated by Ca2+ in the ambient buffer. Subsequent depletion of Ca2+ by means of BAPTA/EDTA causes retraction of the membrane, resulting in spontaneous lipid nanotube network formation...
January 22, 2019: Journal of Visualized Experiments: JoVE
Patrick T Reeves, Jayasree Krishnamurthy, Eric A Pasman, Cade M Nylund
During the observance of Christmas, many families display decorations, which increases the risk of unfettered access and subsequent ingestion of small objects by children in the home. Our aim was to characterize the epidemiology of Christmas foreign body ingestion (CFBI) by children. National Electronic Injury Surveillance System data from 1997 to 2015 were obtained for children aged 0 to 17 years who presented to United States Emergency Departments matching "ingested" for "artificial Christmas trees"; "Christmas tree lights"; "Christmas tree stands or supports"; "Christmas decorations, nonelectric"; and "Christmas decorations, electric" (excluding tree lights)...
February 8, 2019: Clinical Pediatrics
Maria Vinas, Clara Benedi-Garcia, Sara Aissati, Daniel Pascual, Vyas Akondi, Carlos Dorronsoro, Susana Marcos
Adaptive optics (AO) visual simulators based on deformable mirrors, spatial light modulators or optotunable lenses are increasingly used to simulate vision through different multifocal lens designs. However, the correspondence of this simulation with that obtained through real intraocular lenses (IOLs) tested on the same eyes has not been, to our knowledge, demonstrated. We compare through-focus (TF) optical and visual quality produced by real multifocal IOLs (M-IOLs) -bifocal refractive and trifocal diffractive- projected on the subiect's eye with those same designs simulated with a spatial light modulator (SLM) or an optotunable lens working in temporal multiplexing mode (SimVis technology)...
February 7, 2019: Scientific Reports
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