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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
#1
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
#2
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
#3
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
#4
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
https://www.readbyqxmd.com/read/27836173/distinguishable-co-transport-mechanisms-of-phenanthrene-and-oxytetracycline-with-oxidized-multiwalled-carbon-nanotubes-through-saturated-soil-and-sediment-columns-vehicle-and-competition-effects
#5
Jing Fang, Minhao Wang, Bing Shen, Luqing Zhang, Daohui Lin
To date mechanisms underlying co-transports of engineered nanomaterials (ENMs) with contaminants have not been adequately explored, which involve complex interactions among ENMs, contaminants, and soils. This study investigated co-transport behaviors of 3 oxidized-multiwalled carbon nanotubes (o-MWCNTs) with phenanthrene (PHE) and oxytetracycline (OTC) in soil and sediment columns. Sorptions and desorptions of PHE and OTC by the o-MWCNTs were examined to facilitate the discussion of co-transport mechanisms...
November 3, 2016: Water Research
https://www.readbyqxmd.com/read/27833796/environmental-land-cover-and-land-use-constraints-on-the-distributional-patterns-of-anurans-leptodacylus-species-anura-leptodactylidae-from-dry-chaco
#6
Regina Gabriela Medina, Maria Laura Ponssa, Ezequiel Aráoz
Subtropical dry forests are among the most vulnerable biomes to land transformation at a global scale. Among them, the Dry Chaco suffers an accelerated change due to agriculture expansion and intensification. The Dry Chaco ecoregion is characterized by high levels of endemisms and species diversity, which are the result of a variety of climates and reliefs, allowing a wide variety of environments. The amphibian group exhibits a high richness in the Dry Chaco, which has been barely studied in relation to land cover changes...
2016: PeerJ
https://www.readbyqxmd.com/read/27829014/systematic-review-of-screening-and-surveillance-programs-to-protect-workers-from-nanomaterials
#7
Mary Gulumian, Jos Verbeek, Charlene Andraos, Natasha Sanabria, Pieter de Jager
BACKGROUND: Screening and surveillance approaches for workers exposed to nanomaterials could aid in early detection of health effects, provide data for epidemiological studies and inform action to decrease exposure. The aim of this review is to identify such screening and surveillance approaches, in order to extract available data regarding (i) the studies that have successfully been implemented in present day, (ii) identification of the most common and/or toxic nano-related health hazards for workers and (iii) possible exposure surveillance markers...
2016: PloS One
https://www.readbyqxmd.com/read/27808118/past-climate-changes-facilitated-homoploid-speciation-in-three-mountain-spiny-fescues-festuca-poaceae
#8
I Marques, D Draper, M L López-Herranz, T Garnatje, J G Segarra-Moragues, P Catalán
Apart from the overwhelming cases of allopolyploidization, the impact of speciation through homoploid hybridization is becoming more relevant than previously thought. Much less is known, however, about the impact of climate changes as a driven factor of speciation. To investigate these issues, we selected Festuca picoeuropeana, an hypothetical natural hybrid between the diploid species F. eskia and F. gautieri that occurs in two different mountain ranges (Cantabrian Mountains and Pyrenees) separated by more than 400 km...
November 3, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27791052/ultrathin-transferred-layers-of-thermally-grown-silicon-dioxide-as-biofluid-barriers-for-biointegrated-flexible-electronic-systems
#9
Hui Fang, Jianing Zhao, Ki Jun Yu, Enming Song, Amir Barati Farimani, Chia-Han Chiang, Xin Jin, Yeguang Xue, Dong Xu, Wenbo Du, Kyung Jin Seo, Yiding Zhong, Zijian Yang, Sang Min Won, Guanhua Fang, Seo Woo Choi, Santanu Chaudhuri, Yonggang Huang, Muhammad Ashraful Alam, Jonathan Viventi, N R Aluru, John A Rogers
Materials that can serve as long-lived barriers to biofluids are essential to the development of any type of chronic electronic implant. Devices such as cardiac pacemakers and cochlear implants use bulk metal or ceramic packages as hermetic enclosures for the electronics. Emerging classes of flexible, biointegrated electronic systems demand similar levels of isolation from biofluids but with thin, compliant films that can simultaneously serve as biointerfaces for sensing and/or actuation while in contact with the soft, curved, and moving surfaces of target organs...
October 18, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27785722/influence-of-ph-particle-size-and-crystal-form-on-dissolution-behaviour-of-engineered-nanomaterials
#10
M-L Avramescu, P E Rasmussen, M Chénier, H D Gardner
Solubility is a critical component of physicochemical characterisation of engineered nanomaterials (ENMs) and an important parameter in their risk assessments. Standard testing methodologies are needed to estimate the dissolution behaviour and biodurability (half-life) of ENMs in biological fluids. The effect of pH, particle size and crystal form on dissolution behaviour of zinc metal, ZnO and TiO2 was investigated using a simple 2 h solubility assay at body temperature (37 °C) and two pH conditions (1.5 and 7) to approximately frame the pH range found in human body fluids...
October 26, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27783641/environmental-niche-modelling-of-phlebotomine-sand-flies-and-cutaneous-leishmaniasis-identifies-lutzomyia-intermedia-as-the-main-vector-species-in-southeastern-brazil
#11
Viviane Coutinho Meneguzzi, Claudiney Biral Dos Santos, Gustavo Rocha Leite, Blima Fux, Aloísio Falqueto
Cutaneous leishmaniasis (CL) is caused by a protozoan of the genus Leishmania and is transmitted by sand flies. The state of Espírito Santo (ES), an endemic area in southeast Brazil, has shown a considerably high prevalence in recent decades. Environmental niche modelling (ENM) is a useful tool for predicting potential disease risk. In this study, ENM was applied to sand fly species and CL cases in ES to identify the principal vector and risk areas of the disease. Sand flies were collected in 466 rural localities between 1997 and 2013 using active and passive capture...
2016: PloS One
https://www.readbyqxmd.com/read/27769416/separation-and-determination-of-silver-nanoparticle-in-environmental-water-and-the-uv-induced-photochemical-transformations-study-of-agnps-by-cloud-point-extraction-combined-icp-ms
#12
Yuan Yang, Li Luo, Hai-Pu Li, Qiang Wang, Zhao-Guang Yang, Chen-Lu Long
In this study, cloud point extraction (CPE) combined inductively coupled plasma mass spectrometry (ICP-MS) was used to determinate silver nanoparticles (AgNPs) in environmental water. AgNPs dispersed in water could be extracted into surfactant phase based on optimized CPE parameters which including pH, incubation temperature and equilibration time, the content of nonionic surfactants (Triton X-114, TX-114) and Na2S3O3. Good separation results of AgNPs and ionic silver Ag(I) in aqueous environment was obtained with the addition of Na2S3O3 when the concentration of Ag(I) was lower than ten times of AgNPs...
December 1, 2016: Talanta
https://www.readbyqxmd.com/read/27766831/interactions-between-algal-extracellular-polymeric-substances-and-commercial-tio2-nanoparticles-in-aqueous-media
#13
Adeyemi S Adeleye, Arturo A Keller
The implications of engineered nanomaterials (ENMs) in the environment are often investigated using pristine particles. However, there are several biogenic and geogenic materials in natural waters that interact with and modify the surface of ENMs, thereby influencing their fate and effects. Here we studied the influence of soluble extracellular polymeric substances (sEPS) produced by freshwater and marine algae on the surface properties and fate of three commercial TiO2 nanoparticles (nTiO2) with different coatings...
October 21, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27761304/local-scale-models-reveal-ecological-niche-variability-in-amphibian-and-reptile-communities-from-two-contrasting-biogeographic-regions
#14
Alberto Muñoz, Xavier Santos, Ángel M Felicísimo
Ecological Niche Models (ENMs) are widely used to describe how environmental factors influence species distribution. Modelling at a local scale, compared to a large scale within a high environmental gradient, can improve our understanding of ecological species niches. The main goal of this study is to assess and compare the contribution of environmental variables to amphibian and reptile ENMs in two Spanish national parks located in contrasting biogeographic regions, i.e., the Mediterranean and the Atlantic area...
2016: PeerJ
https://www.readbyqxmd.com/read/27737632/demographical-history-and-palaeodistribution-modelling-show-range-shift-towards-amazon-basin-for-a-neotropical-tree-species-in-the-lgm
#15
Luciana Cristina Vitorino, Matheus S Lima-Ribeiro, Levi Carina Terribile, Rosane G Collevatti
BACKGROUND: We studied the phylogeography and demographical history of Tabebuia serratifolia (Bignoniaceae) to understand the disjunct geographical distribution of South American seasonally dry tropical forests (SDTFs). We specifically tested if the multiple and isolated patches of SDTFs are current climatic relicts of a widespread and continuously distributed dry forest during the last glacial maximum (LGM), the so called South American dry forest refugia hypothesis, using ecological niche modelling (ENM) and statistical phylogeography...
October 13, 2016: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/27686080/metal-nanomaterial-toxicity-variations-within-the-vascular-system
#16
REVIEW
Alaeddin B Abukabda, Phoebe A Stapleton, Timothy R Nurkiewicz
Engineered nanomaterials (ENM) are anthropogenic materials with at least one dimension less than 100 nm. Their ubiquitous employment in biomedical and industrial applications in the absence of full toxicological assessments raises significant concerns over their safety on human health. This is a significant concern, especially for metal and metal oxide ENM as they may possess the greatest potential to impair human health. A large body of literature has developed that reflects adverse systemic effects associated with exposure to these materials, but an integrated mechanistic framework for how ENM exposure influences morbidity remains elusive...
December 2016: Current Environmental Health Reports
https://www.readbyqxmd.com/read/27672390/editorial-nanotoxicology-and-environmental-risk-assessment-of-engineered-nanomaterials-enms-in-plants
#17
EDITORIAL
Nelson Marmiroli, Jason C White
No abstract text is available yet for this article.
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27664541/mechanically-enhanced-pes-electrospun-nanofiber-membranes-enms-for-microfiltration-the-effects-of-enm-properties-on-membrane-performance
#18
Jiyeol Bae, Inchan Baek, Heechul Choi
The application of electrospun nanofiber membranes (ENMs) as microfilters for the process of water purification requires the substrate to possess suitable strength, permeability, and a smooth surface. Therefore, the fiber homogeneity, inter-fiber adhesion, and surface roughness of the ENMs must be carefully controlled. Concurrently, an understanding of the ENMs' rejection mechanism for contaminants is necessary for the effective application of ENMs. In this study, we demonstrate the fabrication of polyethersulfone (PES) ENMs, which are useful for water purification as water treatment membranes...
November 15, 2016: Water Research
https://www.readbyqxmd.com/read/27664001/comparative-human-health-impact-assessment-of-engineered-nanomaterials-in-the-framework-of-life-cycle-assessment
#19
Wouter Fransman, Harrie Buist, Eelco Kuijpers, Tobias Walser, David Meyer, Esther Zondervan-van den Beuken, Joost Westerhout, Rinke H Klein Entink, Derk H Brouwer
For safe innovation, knowledge on potential human health impacts is essential. Ideally, these impacts are considered within a larger life-cycle-based context to support sustainable development of new applications and products. A methodological framework that accounts for human health impacts caused by inhalation of engineered nanomaterials (ENMs) in an indoor air environment has been previously developed. The objectives of this study are as follows: (i) evaluate the feasibility of applying the CF framework for NP exposure in the workplace based on currently available data; and (ii) supplement any resulting knowledge gaps with methods and data from the life cycle approach and human risk assessment (LICARA) project to develop a modified case-specific version of the framework that will enable near-term inclusion of NP human health impacts in life cycle assessment (LCA) using a case study involving nanoscale titanium dioxide (nanoTiO2 )...
September 24, 2016: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/27658822/fibrous-shape-underlies-the-mutagenic-and-carcinogenic-potential-of-nanosilver-while-surface-chemistry-affects-the-biosafety-of-iron-oxide-nanoparticles
#20
Alena Gábelová, Naouale El Yamani, Tamara Iglesias Alonso, Barbora Buliaková, Annamária Srančíková, Andrea Bábelová, Elise Runden Pran, Lise Marie Fjellsbø, Elisabeth Elje, Mazyar Yazdani, Maria João Silva, Mária Dušinská
Nowadays engineered nanomaterials (ENMs) are increasingly used in a wide range of commercial products and biomedical applications. Despite this, the knowledge of human potential health risk as well as comprehensive biological and toxicological information is still limited. We have investigated the capacity of two frequently used metallic ENMs, nanosilver and magnetite nanoparticles (MNPs), to induce thymidine kinase (Tk (+/-)) mutations in L5178Y mouse lymphoma cells and transformed foci in Bhas 42 cells. Two types of nanosilver, spherical nanoparticles (AgNM300) and fibrous (AgNM302) nanorods/wires, and MNPs differing in surface modifications [MNPs coated with sodium oleate (SO-MNPs), MNPs coated with SO + polyethylene glycol (SO-PEG-MNPs) and MNPs coated with SO + PEG + poly(lactide-co-glycolic acid) SO-PEG-PLGA-MNPs] were included in this study...
September 22, 2016: Mutagenesis
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