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https://www.readbyqxmd.com/read/28079924/optimized-microwave-assistant-extraction-combined-ultrasonic-pretreatment-of-flavonoids-from-periploca-forrestii-schltr-and-evaluation-of-its-anti-allergic-activity
#1
Qian Liang, Huaguo Chen, Xin Zhou, Qingfang Deng, Enming Hu, Chao Zhao, Xiaojian Gong
Microwave extraction combined ultrasonic pretreatment of flavonoids from Periploca forrestii Schltr. was investigated in this study, extraction process was firstly performed in an ultrasonic cleaner, then treated by microwave irradiation. The optimum ultrasonic time of 25 min was selected by single-factor experiments. A response surface methodology (RSM) has been used to obtain a mathematical model that describes the process and analyzes the significant parameters ethanol concentration 59.92%, liquid to raw materials ratio 21...
January 12, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28078887/electrospun-regenerated-cellulose-nanofiber-membranes-surface-grafted-with-water-insoluble-poly-hema-or-water-soluble-poly-aas-chains-via-the-atrp-method-for-ultrafiltration-of-water
#2
Zhao Wang, Caitlin Crandall, Vicki L Prautzsch, Rajesh Sahadevan, Todd J Menkhaus, Hao Fong
Electrospun nanofiber membranes (ENMs) have demonstrated promising applications for water purification primarily due to high water flux and low degree of fouling. However, the equivalent/apparent pore sizes of as-electrospun ENMs are in microns/sub-microns; therefore, the ENMs can only be directly utilized for microfiltration applications. To make regenerated cellulose (RC) ENMs for ultrafiltration applications, atom transfer radical polymerization (ATRP) was studied to graft polymer chains onto the surface of RC nanofibers; in specific, the monomers of 2-hydroxyethyl methacrylate (HEMA) and sodium acrylate (AAS) were selected for surface-grafting water-insoluble and water-soluble polymer chains onto RC nanofibers, respectively...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28074927/quaternary-climate-change-drives-allo-peripatric-speciation-and-refugial-divergence-in-the-dysosma-versipellis-pleiantha-complex-from-different-forest-types-in-china
#3
Yi-Han Wang, Hans Peter Comes, Ya-Nan Cao, Rui Guo, Yun-Rui Mao, Ying-Xiong Qiu
Subtropical China harbours the world's most diverse temperate flora, but little is known about the roles of geographical and eco-climatic factors underlying the region's exceptionally high levels of species diversity and endemism. Here we address this key question by investigating the spatio-temporal and ecological processes of divergence within the Dysosma versipellis-pleiantha species complex, endemic to subtropical China. Our cpDNA phylogeny showed that this monophyletic group of understory herbs is derived from a Late Pliocene ancestor of the Qinghai-Tibetan Plateau (QTP)/Southwest China...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28073641/effect-of-surfactants-on-the-aggregation-and-sedimentation-of-zinc-oxide-nanomaterial-in-natural-water-matrices
#4
Xuankun Li, Minoru Yoneda, Yoko Shimada, Yasuto Matsui
The wide application of surfactants and engineered nanomaterials (ENMs) in industrial and consumer products lead to the high possibility of their co-presence in natural water environment, making it important to study the effect of surfactants on the environmental behavior and fate of ENMs. In this work, we selected an anionic sodium dodecyl sulfate (SDS) and a nonionic nonylphenol ethoxylate (NPEO, Tergitol NP-9) to study their effects on the aggregation and sedimentation of a 20nm ZnO ENM in different water matrices...
January 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28068760/a-laboratory-scale-microbial-food-chain-to-study-bioaccumulation-biomagnification-and-ecotoxicity-of-cadmium-telluride-quantum-dots
#5
Govind Sharan Gupta, Ashutosh Kumar, Violet Aileen Senapati, Alok Kumar Pandey, Rishi Shanker, Alok Dhawan
The increasing applications of engineered nanomaterials (ENMs) in consumer products warrant a careful evaluation of their trophic transfer and consequent ecological impact. In the present study, a laboratory scale aquatic microbial food chain was established using bacteria (Escherichia coli) as a prey and ciliated protozoan (Paramecium caudatum) as a predator organism to determine the impact of cadmium telluride quantum dots (CdTe QDs). We observed that 29% of bacterivory potential of Paramecium was lost, including a ~12 h of delay in doubling time on exposure to 25 mg/L of CdTe QD (~4 nm) as compared to control...
January 9, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28043838/fluctuation-matching-approach-for-elastic-network-model-and-structure-based-model-of-biomacromolecules
#6
REVIEW
Christian Domilongo Bope, Dudu Tong, Xiuting Li, Lanyuan Lu
Elastic network models (ENMs) based on simple harmonic potential energy function have been proven over the last decade to be reliable computational models for understanding the intrinsic dynamics of biomacromolecules. In the original ENMs, the spring constants for different contact pairs are assumed to be identical, while there are a number of recent developments to determine non-uniform spring constants from atomistic force fields or experimental information. In particular, the fluctuation matching approaches in coarse-grained modeling can be applied to build more realistic heterogeneous ENMs, using information from an atomistic force field or experimental B-factors...
December 30, 2016: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28035264/environmental-in-dependence-of-a-hybrid-zone-insights-from-molecular-markers-and-ecological-niche-modeling-in-a-hybrid-zone-of-origanum-lamiaceae-on-the-island-of-crete
#7
Michael Bariotakis, Konstantina Koutroumpa, Regina Karousou, Stergios A Pirintsos
The role of environment and the relative significance of endogenous versus exogenous selection in shaping hybrid zones have been crucial issues in the studies of hybridization. Recent advances in ecological niche modeling (ENM) offer new methodological tools, especially in combination with the genotyping of individuals in the hybrid zone. Here, we study the hybrid zone between the widely known spices Origanum onites and Origanum vulgare ssp. hirtum in Crete. We analyze the genetic structure of both parental taxa and their hybrid Origanum × intercendens using AFLP markers on 15 sympatric and 12 allopatric populations and employ ecological niche modeling and niche similarity tests to study their niche patterns...
December 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/28017784/ecophysiological-perspectives-on-engineered-nanomaterial-toxicity-in-fish-and-crustaceans
#8
Neal Ingraham Callaghan, Tyson James MacCormack
Engineered nanomaterials (ENMs) are incorporated into numerous industrial, clinical, food, and consumer products and a significant body of evidence is now available on their toxicity to aquatic organisms. Environmental ENM concentrations are difficult to quantify, but production and release estimates suggest wastewater treatment plant effluent levels ranging from 10(-4) to >10(1)μgL(-1) for the most common formulations by production volume. Bioavailability and ENM toxicity are heavily influenced by water quality parameters and the physicochemical properties and resulting colloidal behaviour of the particular ENM formulation...
December 23, 2016: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28011747/nanogenotoxicology-present-and-the-future
#9
Shareen H Doak, Maria Dusinska
This Mutagenesis special issue is on the topic of nanogenotoxicology. It unites a collection of reports that provide insight into: (i) the properties of engineered nanomaterials (ENMs) that contribute to genotoxicity, (ii) the genotoxic mechanisms associated with DNA damage observed in both in vitro and in vivo tests and (iii) the future test systems that will provide more accurate prediction of ENM genotoxicity to support regulatory hazard assessment frameworks. The contributions within therefore provide collective oversight of our current understanding, coupled to future perspectives aimed at overcoming technical hurdles and describing novel analytical methods to further advance the field...
January 2017: Mutagenesis
https://www.readbyqxmd.com/read/28005858/whispering-gallery-mode-temperature-sensor-of-liquid-microresonastor
#10
Zhihai Liu, Lu Liu, Zongda Zhu, Yu Zhang, Yong Wei, Xiaonan Zhang, Enming Zhao, Yaxun Zhang, Jun Yang, Libo Yuan
We propose and demonstrate a whispering gallery mode (WGM) resonance-based temperature sensor, where the microresonator is made of a DCM (2-[2-[4-(dimethylamino)phenyl] ethenyl]-6-methyl-4H-pyran-4-ylidene)-doped oil droplet (a liquid material) immersed in the water solution. The oil droplet is trapped, controlled, and located by a dual-fiber optical tweezers, which prevents the deformation of the liquid droplet. We excite the fluorescence and lasing in the oil droplet and measure the shifts of the resonance wavelength at different temperatures...
October 15, 2016: Optics Letters
https://www.readbyqxmd.com/read/27992831/nanotechnology-to-the-rescue-using-nano-enabled-approaches-in-microbiological-food-safety-and-quality
#11
REVIEW
Mary Eleftheriadou, Georgios Pyrgiotakis, Philip Demokritou
Food safety and quality assurance is entering a new era. Interventions along the food supply chain must become more efficient in safeguarding public health and the environment and must address numerous challenges and new consumption trends. Current methods of microbial control to assure the safety of food and minimize microbial spoilage have each shown inefficiencies. Nanotechnology is a rapidly expanding area in the agri/feed/food sector. Nano-enabled approaches such as antimicrobial food-contact surfaces/packaging, nano-enabled sensors for rapid pathogen/contaminant detection and nano-delivered biocidal methods, currently on the market or at a developmental stage, show great potential for the food industry...
December 16, 2016: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/27989526/improving-the-prediction-of-environmental-fate-of-engineered-nanomaterials-by-fractal-modelling
#12
REVIEW
S Avilov, L Lamon, D Hristozov, A Marcomini
A critical analysis of the available engineered nanomaterials (ENMs) environmental fate modelling approaches indicates that existing tools do not satisfactorily account for the complexities of nanoscale phenomena. Fractal modelling (FM) can complement existing kinetic fate models by including more accurate interpretations of shape and structure, density and collision efficiency parameters to better describe homo- and heteroaggregation. Pathways to including hierarchical symmetry concepts and a route to establishing a structural classification of nanomaterials based on FM are proposed...
December 15, 2016: Environment International
https://www.readbyqxmd.com/read/27974065/evaluation-of-the-impacts-of-climate-change-on-disease-vectors-through-ecological-niche-modelling
#13
B M Carvalho, E F Rangel, M M Vale
Vector-borne diseases are exceptionally sensitive to climate change. Predicting vector occurrence in specific regions is a challenge that disease control programs must meet in order to plan and execute control interventions and climate change adaptation measures. Recently, an increasing number of scientific articles have applied ecological niche modelling (ENM) to study medically important insects and ticks. With a myriad of available methods, it is challenging to interpret their results. Here we review the future projections of disease vectors produced by ENM, and assess their trends and limitations...
December 15, 2016: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/27942214/nanotoxicity-emerging-concerns-regarding-nanomaterial-safety-and-occupational-hard-metal-wc-co-nanoparticle-exposure
#14
REVIEW
Andrea L Armstead, Bingyun Li
As the number of commercial and consumer products containing engineered nanomaterials (ENMs) continually rises, the increased use and production of these ENMs presents an important toxicological concern. Although ENMs offer a number of advantages over traditional materials, their extremely small size and associated characteristics may also greatly enhance their toxic potentials. ENM exposure can occur in various consumer and industrial settings through inhalation, ingestion, or dermal routes. Although the importance of accurate ENM characterization, effective dosage metrics, and selection of appropriate cell or animal-based models are universally agreed upon as important factors in ENM research, at present, there is no "standardized" approach used to assess ENM toxicity in the research community...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27919184/role-of-engineered-metal-oxide-nanoparticle-agglomeration-in-reactive-oxygen-species-generation-and-cathepsin-b-release-in-nlrp3-inflammasome-activation-and-pulmonary-toxicity
#15
Tina M Sager, Michael Wolfarth, Stephen S Leonard, Anna M Morris, Dale W Porter, Vincent Castranova, Andrij Holian
Incomplete understanding of the contributions of dispersants and engineered nanoparticles/materials (ENM) agglomeration state to biological outcomes presents an obstacle for toxicological studies. Although reactive oxygen species (ROS) production is often regarded as the primary indicator of ENM bioactivity and toxicity, it remains unclear whether ENM produce ROS or whether ROS is an outcome of ENM-induced cell injury. Phagolysosomal disruption and cathepsin B release also promote bioactivity through inflammasome activation...
December 2016: Inhalation Toxicology
https://www.readbyqxmd.com/read/27918113/genome-wide-dna-methylation-variations-upon-exposure-to-engineered-nanomaterials-and-their-implications-in-nanosafety-assessment
#16
Yue Chen, Ming Xu, Jie Zhang, Juan Ma, Ming Gao, Zhihong Zhang, Yong Xu, Sijin Liu
Sublethal exposure of engineered nanomaterials (ENMs) induces the alteration of various cellular processes due to DNA methylation changes. DNA methylation variations represent a more sensitive fingerprint analysis of the direct and indirect effects that may be overlooked by traditional toxicity assays, and an understanding of the structure-activity relationship of DNA methylation upon ENMs would open a new path for their safer design.
December 5, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27907088/silver-nanoparticle-directed-mast-cell-degranulation-is-mediated-through-calcium-and-pi3k-signaling-independent-of-the-high-affinity-ige-receptor
#17
Nasser B Alsaleh, Indushekhar Persaud, Jared M Brown
Engineered nanomaterial (ENM)-mediated toxicity often involves triggering immune responses. Mast cells can regulate both innate and adaptive immune responses and are key effectors in allergic diseases and inflammation. Silver nanoparticles (AgNPs) are one of the most prevalent nanomaterials used in consumer products due to their antimicrobial properties. We have previously shown that AgNPs induce mast cell degranulation that was dependent on nanoparticle physicochemical properties. Furthermore, we identified a role for scavenger receptor B1 (SR-B1) in AgNP-mediated mast cell degranulation...
2016: PloS One
https://www.readbyqxmd.com/read/27891142/genetic-structure-and-evolutionary-history-of-three-alpine-sclerophyllous-oaks-in-east-himalaya-hengduan-mountains-and-adjacent-regions
#18
Li Feng, Qi-Jian Zheng, Zeng-Qiang Qian, Jia Yang, Yan-Ping Zhang, Zhong-Hu Li, Gui-Fang Zhao
The East Himalaya-Hengduan Mountains (EH-HM) region has a high biodiversity and harbors numerous endemic alpine plants. This is probably the result of combined orographic and climate oscillations occurring since late Tertiary. Here, we determined the genetic structure and evolutionary history of alpine oak species (including Quercus spinosa, Quercus aquifolioides, and Quercus rehderiana) using both cytoplasmic-nuclear markers and ecological niche models (ENMs), and elucidated the impacts of climate oscillations and environmental heterogeneity on their population demography...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27886271/speciation-and-genetic-diversity-in-centaurea-subsect-phalolepis-in-anatolia
#19
Jordi López-Pujol, Sara López-Vinyallonga, Alfonso Susanna, Kuddisi Ertuğrul, Tuna Uysal, Osman Tugay, Arbi Guetat, Núria Garcia-Jacas
Mountains of Anatolia are one of the main Mediterranean biodiversity hotspots and their richness in endemic species amounts for 30% of the flora. Two main factors may account for this high diversity: the complex orography and its role as refugia during past glaciations. We have investigated seven narrow endemics of Centaurea subsection Phalolepis from Anatolia by means of microsatellites and ecological niche modelling (ENM), in order to analyse genetic polymorphisms and getting insights into their speciation...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27843710/herbarium-based-studies-on-taxonomy-biogeography-and-ecology-of-psilochilus-orchidaceae
#20
Marta Kolanowska, Aleksandra M Naczk, Radomir Jaskuła
BACKGROUND: Psilochilus is a poorly studied orchid genus distributed from southern Mexico to south-eastern Brazil. A taxonomic revision of this Neotropical endemic based on morphological data is presented. MATERIAL AND METHODS: Over 170 dried herbarium specimens and flowers preserved in liquid of Psilochilus were analyzed. Morphological variation among examined taxa was described based on multivariate analysis. To evaluate the similarity between niches occupied by various Psilochilus species ecological niche modeling (ENM) was applied...
2016: PeerJ
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