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https://www.readbyqxmd.com/read/28822173/-breakthrough-in-key-science-and-technologies-in-dendrobium-catenatum-industry
#1
Ji-Ping Si, Qi Wang, Zhong-Jian Liu, Jing-Jing Liu, Yi-Bo Luo
In view of the significant difficulties of propagation, planting and simple product in Dendrobium catenatum(D. officinale)industry development, a series of research were carried out. Genome study showed that D. catenatum is a specie of diploid with 38 chromosomes and 28 910 protein-coding genes. It was identified that specific genes accumulated in different organs at the transcriptome level. We got an insight into the gene regulation mechanism of the loss of the endospermous seed, the wide ecological adaptability and the synthesis of polysaccharides, which provided a theoretical basis for genetic engineering breeding and development and utilization of active pharmaceutical ingredients...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822157/-the-analysis-of-multivariate-image-and-chemometrics-in-tlc-fingerprinting-of-artificial-cow-bezoar
#2
Ling-Wen Yao, Yan Shi, Dong-Mei Sun, Xian-Long Cheng, Feng Wei, Shuang-Cheng Ma
A method of thin-layer fingerprinting chromatogram of artificial cow-bezoar was established with the developing solvent consisting of cyclohexane, ethyl acetate, acetic acid and methanol (2∶7∶1∶2), and 10% sulfuric acid ethanol solution sprayed as colour-developing agent. After heated at 105 ℃, TLC was recorded as an image in ultraviolet light at 366 nm which was converted into grayscale. By the gray value extracted from the grayscale, the multivariate data obtained from TLC of samples could be analyzed by chemometric method...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28821739/ultrafast-photonic-reinforcement-learning-based-on-laser-chaos
#3
Makoto Naruse, Yuta Terashima, Atsushi Uchida, Song-Ju Kim
Reinforcement learning involves decision making in dynamic and uncertain environments and constitutes an important element of artificial intelligence (AI). In this work, we experimentally demonstrate that the ultrafast chaotic oscillatory dynamics of lasers efficiently solve the multi-armed bandit problem (MAB), which requires decision making concerning a class of difficult trade-offs called the exploration-exploitation dilemma. To solve the MAB, a certain degree of randomness is required for exploration purposes...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820023/use-of-oxalic-acid-as-inducer-in-photocatalytic-oxidation-of-cresol-red-in-aqueous-solution-under-natural-and-artificial-light
#4
N Seraghni, I Ghoul, I Lemmize, A Reguig, N Debbache, T Sehili
This work was carried out in the field of water treatment using advanced oxidation processes (AOPs), especially photolysis of carboxylic acid leads to the formation in situ of hydroxyl radical ((.)OH). Cresol red (CR) degradation induced by organic acids/UV system was investigated in aqueous solution. The preliminary study of CR-organic acid mixture in the dark and at room temperature allowed confirming the absence of interaction under our experimental conditions. However, up on irradiation at 365 nm the percentage of elimination of CR was 89% after 5 hours of irradiation...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28817256/tailorable-exciton-transport-in-doped-peptide-amphiphile-assemblies
#5
Lee A Solomon, Matthew E Sykes, Yimin A Wu, Richard D Schaller, Gary P Wiederrecht, Harry Christopher Fry
Light-harvesting biomaterials are an attractive target in photovoltaics, photocatalysis, and artificial photosynthesis. Through peptide self-assembly, complex nanostructures can be engineered to study the role of chromophore organization during light absorption and energy transport. To this end, we demonstrate the one-dimensional transport of excitons along naturally occurring, light-harvesting, Zn-protoporphyrin IX chromophores within self-assembled peptide-amphiphile nanofibers. The internal structure of the nanofibers induces packing of the porphyrins into linear chains...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28817145/coherent-electronic-and-nuclear-dynamics-in-a-rhodamine-heterodimer-dna-supramolecular-complex
#6
M Cipolloni, B Fresch, I Occhiuto, P Rukin, K G Komarova, A Cecconello, I Willner, R D Levine, F Remacle, E Collini
Elucidating the role of quantum coherences in energy migration within biological and artificial multichromophoric antenna systems is the subject of an intense debate. It is also a practical matter because of the decisive implications for understanding the biological processes and engineering artificial materials for solar energy harvesting. A supramolecular rhodamine heterodimer on a DNA scaffold was suitably engineered to mimic the basic donor-acceptor unit of light-harvesting antennas. Ultrafast 2D electronic spectroscopic measurements allowed identifying clear features attributable to a coherent superposition of dimer electronic and vibrational states contributing to the coherent electronic charge beating between the donor and the acceptor...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28813718/transgenic-mice-over-expressing-rbp4-have-rbp4-dependent-and-light-independent-retinal-degeneration
#7
Mei Du, Eric Phelps, Michael J Balangue, Aaron Dockins, Gennadiy Moiseyev, Younghwa Shin, Shelley Kane, Laura Otalora, Jian-Xing Ma, Rafal Farjo, Krysten M Farjo
Purpose: Transgenic mice overexpressing serum retinol-binding protein (RBP4-Tg) develop progressive retinal degeneration, characterized by microglia activation, yet the precise mechanisms underlying retinal degeneration are unclear. Previous studies showed RBP4-Tg mice have normal ocular retinoid levels, suggesting that degeneration is independent of the retinoid visual cycle or light exposure. The present study addresses whether retinal degeneration is light-dependent and RBP4-dependent by testing the effects of dark-rearing and pharmacological lowering of serum RBP4 levels, respectively...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28813152/coherent-exciton-delocalization-in-a-two-state-dna-templated-dye-aggregate-system
#8
Brittany L Cannon, Donald L Kellis, Lance Kenneth Patten, Paul H Davis, Jeunghoon Lee, Elton Graugnard, Bernard Yurke, William B Knowlton
Coherent exciton delocalization in dye aggregate systems gives rise to a variety of intriguing optical phenomena, including J- and H-aggregate behavior and Davydov splitting. Systems that exhibit coherent exciton delocalization at room temperature are of interest for the development of artificial light-harvesting devices, colorimetric detection schemes, and quantum computers. Here, we report on a simple dye system templated by DNA that exhibits tunable optical properties. At low salt and DNA concentrations, a DNA duplex with two internally functionalized Cy5 dyes (i...
August 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28813122/morphological-alterations-in-the-jejunal-mucosa-of-aged-rats-and-the-possible-protective-role-of-green-tea
#9
Zeinab Abel-Rehim Hassan, Agata Zauszkiewicz-Pawlak, Shaimaa A Abdelrahman, Sami Algaidi, Maha Desouky, Sally M Shalaby
INTRODUCTION: Gastrointestinal disorders become more prevalent with ageing. This study is aimed to describe morphological changes that occur in the jejunal mucosa of male albino rats as a result of ageing and the protective effect of green tea supplements. MATERIAL AND METHODS: The experiment was performed on sixty rats: thirty young-adult (6-month old, body mass 200-220 g) and thirty old (24-month-old, body mass 220-260 g) animals. Each group was further divided into two subgroups (n = 15 each): control rats and green tea-treated rats that received 1...
August 16, 2017: Folia Histochemica et Cytobiologica
https://www.readbyqxmd.com/read/28810701/yeast-genes-involved-in-regulating-cysteine-uptake-affect-production-of-hydrogen-sulfide-from-cysteine-during-fermentation
#10
Chien-Wei Huang, Michelle E Walker, Bruno Fedrizzi, Richard C Gardner, Vladimir Jiranek
An early burst of hydrogen sulfide (H2S) produced by Saccharomyces cerevisiae during fermentation could increase varietal thiols and therefore enhance desirable tropical aromas in varieties such as Sauvignon Blanc. Here we attempted to identify genes affecting H2S formation from cysteine by screening yeast deletion libraries via a colony colour assay on media resembling grape juice. Both Δlst4 and Δlst7 formed lighter coloured colonies and produced significantly less H2S than the wild type on high concentrations of cysteine, likely because they are unable to take up cysteine efficiently...
August 1, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28808106/quantifying-the-efficiency-of-photoprotection
#11
REVIEW
Alexander V Ruban
A novel emerging technology for the assessment of the photoprotective 'power' of non-photochemical fluorescence quenching (NPQ) has been reviewed and its insightful outcomes are explained using several examples. The principles of the method are described in detail as well as the work undertaken for its justification. This pulse amplitude modulated chlorophyll fluorescence approach has been applied for the past 5 years to quantify the photoprotective effectiveness of the NPQ and the light tolerance in Arabidopsis plants grown under various light conditions, during ontogenetic development as well as in a range of mutants impaired in carotenoid and protein biosynthesis...
September 26, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28805502/the-fundamentals-of-cross-sector-collaboration-for-social-change-to-promote-population-health
#12
Joanne G de Montigny, Sylvie Desjardins, Louise Bouchard
Cross-sector collaboration is increasingly relied upon to tackle society's pressing and intractable problems. Chief among societal problems are unfavorable structural and social determinants of health. The ability to positively change these health determinants rests on the collaborative processes and structures of governance across diverse sectors in society. The purpose of this article is to present a conceptual framework that sheds light on the basic requirements of cross-sector collaboration for social change to promote the health of populations...
August 1, 2017: Global Health Promotion
https://www.readbyqxmd.com/read/28805193/optics-of-plasmon-exciton-nanomaterials
#13
Maxim Sukharev, Abraham Nitzan
This review provides a brief introduction to the physics of coupled exciton-plasmon systems, the theoretical description and experimental manifestation of such phenomena, followed by an account of the state-of-the-art methodology for the numerical simulations of such phenomena and supplemented by a number of FORTRAN codes, by which the interested reader can introduce himself/herself to the practice of such simulations. Applications to CW light scattering as well as transient response and relaxation are described...
August 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28803810/autophagy-plays-a-positive-role-in-zinc-induced-apoptosis-in-intestinal-porcine-epithelial-cells
#14
Xin Zhou, Yansen Li, ChunMei Li
A high‑zinc (Zn) diet has been found to promote growth performance in pigs, but causes cell apoptosis in the intestinal epithelium. To investigate the mechanism underlying the high dietary Zn-induced apoptosis in porcine small intestinal epithelium, IPEC-J2 cells (intestinal porcine epithelial cells) were used to determine the effect of Zn on cell inhibitory, apoptosis, and mitochondrial membrane potential and autophagy in vitro. Results showed that Zn inhibited IPEC-J2 cell proliferation and induced apoptosis and autophagy...
August 10, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28801717/vitamin-b6-is-essential-for-serine-de-novo-biosynthesis
#15
Rúben J Ramos, Mia L Pras-Raves, Johan Gerrits, Maria van der Ham, Marcel Willemsen, Hubertus Prinsen, Boudewijn Burgering, Judith J Jans, Nanda M Verhoeven-Duif
Pyridoxal 5'-phosphate (PLP), the metabolically active form of vitamin B6, plays an essential role in brain metabolism as a cofactor in numerous enzyme reactions. PLP deficiency in brain, either genetic or acquired, results in severe drug-resistant seizures that respond to vitamin B6 supplementation. The pathogenesis of vitamin B6 deficiency is largely unknown. To shed more light on the metabolic consequences of vitamin B6 deficiency in brain, we performed untargeted metabolomics in vitamin B6-deprived Neuro-2a cells...
August 11, 2017: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/28800376/fetal-bovine-serum-fbs-past-present-future
#16
Jan van der Valk, Karen Bieback, Christiane Buta, Brett Cochrane, Wilhelm G Dirks, Jianan Fu, James J Hickman, Christiane Hohensee, Roman Kolar, Manfred Liebsch, Francesca Pistollato, Markus Schulz, Daniel Thieme, Tilo Weber, Joachim Wiest, Stefan Winkler, Gerhard Gstraunthaler
The supplementation of culture medium with fetal bovine serum (FBS, also referred to as 'fetal calf serum') is still common practice in cell culture applications. Due to a number of disadvantages in terms of quality and reproducibility of in vitro data, animal welfare concerns, and in light of recent cases of fraudulent marketing, the search for alternatives and the development of serum-free medium formulations gained global attention. Here, we report on the 3rd Workshop on FBS, Serum Alternatives and Serum-free Media, where (a) regulatory aspects, (b) the serum dilemma, (c) alternatives to FBS, (d) case-studies of serum-free in vitro applications, and (e) the establishment of serum-free databases, were discussed...
August 9, 2017: ALTEX
https://www.readbyqxmd.com/read/28799732/excitation-power-modulates-energy-transfer-dynamics-in-a-supramolecular-ruii-feii-ruii-triad
#17
Joachim Kübel, Maria Wächtler, Benjamin Dietzek
Multichromophoric arrays are key to light-harvesting in natural and artificial photosynthesis. A trinuclear, symmetric RuII-FeII-RuII triad may resemble a light-harvesting model system, in which excitation energy from donor units (Ru-terpyridine-fragments) is efficiently transferred to the acceptor (an Fe-terpyridine-fragment). The photoinduced dynamics after simultaneous excitation of more than a single chromophoric unit (donor/acceptor) at varying excitation fluence is investigated in this contribution. Data suggests that energy transfer is decelerated if the acceptor states (on the FeII unit) are not depopulated fast enough...
August 11, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28798480/magnesium-chloride-promotes-osteogenesis-through-notch-signaling-activation-and-expansion-of-mesenchymal-stem-cells
#18
Juan M Díaz-Tocados, Carmen Herencia, Julio M Martínez-Moreno, Addy Montes de Oca, Maria E Rodríguez-Ortiz, Noemi Vergara, Alfonso Blanco, Sonja Steppan, Yolanda Almadén, Mariano Rodríguez, Juan R Muñoz-Castañeda
Mesenchymal stem cells (MSC) are osteoblasts progenitors and a variety of studies suggest that they may play an important role for the health in the field of bone regeneration. Magnesium supplementation is gaining importance as adjuvant treatment to improve osteogenesis, although the mechanisms involving this process are not well understood. The objective of this study was to investigate the effects of magnesium on MSC differentiation. Here we show that in rat bone marrow MSC, magnesium chloride increases MSC proliferation in a dose-dependent manner promoting osteogenic differentiation and mineralization...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28796893/singing-from-north-to-south-latitudinal-variation-in-timing-of-dawn-singing-under-natural-and-artificial-light-conditions
#19
Arnaud Da Silva, Bart Kempenaers
1. Animals breeding at northern latitudes experience drastic changes in daily light conditions during the breeding season with decreasing periods of darkness, whereas those living at lower latitudes are exposed to naturally dark nights throughout the year. Nowadays, many animals are also exposed to artificial night lighting (often referred to as light pollution). 2. Animals strongly rely on variation in light levels to time their daily and seasonal behaviour. Previous work on passerine birds showed that artificial night lighting leads to earlier onset of dawn song...
August 10, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28794102/optogenetics-and-pharmacogenetics-principles-and-applications
#20
Jingwei Jiang, Huxing Cui, Kamal Rahmouni
Remote and selective spatiotemporal control of the activity of neurons to regulate behavior and physiological functions has been a long-sought goal in system neuroscience. Identification and subsequent bioengineering of light-sensitive ion channels (e.g., channelrhodopsins, halorhodopsin and archaerhodopsins) from the bacteria has made it possible to utilize light to artificially modulate neuronal activity, namely optogenetics. Recent advance in genetics has also allowed development of novel pharmacological tools to selectively and remotely control neuronal activity using engineered G-protein coupled receptors which can be activated by otherwise inert drug-like small molecules such as the Designer Receptors Exclusively Activated by Designer Drug (DREADD) - a form of chemogenetics...
August 9, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
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