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https://www.readbyqxmd.com/read/28444564/response-to-lead-pollution-mycorrhizal-pinus-sylvestris-forms-the-biomineral-pyromorphite-in-roots-and-needles
#1
Maria L Bizo, Sandor Nietzsche, Ulrich Mansfeld, Falko Langenhorst, Juraj Majzlan, Jörg Göttlicher, Alexandru Ozunu, Steffi Formann, Katrin Krause, Erika Kothe
The development of mycorrhized pine seedlings grown in the presence of lead was assessed in order to investigate how higher plants can tolerate lead pollution in the environment. Examination with scanning electron microscopy (SEM) revealed that Pb uptake was prominent in the roots, while a smaller amount was found in pine needles, which requires symplastic uptake and root-to-shoot transfer. Lead was concentrated in nanocrystalline aggregates attached to the cell wall and, according to elemental microanalyses, is associated with phosphorus and chlorine...
April 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28444369/three-dimensional-intracellular-structure-of-a-whole-rice-mesophyll-cell-observed-with-fib-sem
#2
Takao Oi, Sakiko Enomoto, Tomoyo Nakao, Shigeo Arai, Koji Yamane, Mitsutaka Taniguchi
Background and Aims: Ultrathin sections of rice leaf blades observed two-dimensionally using a transmission electron microscope (TEM) show that the chlorenchyma is composed of lobed mesophyll cells, with intricate cell boundaries, and lined with chloroplasts. The lobed cell shape and chloroplast positioning are believed to enhance the area available for the gas exchange surface for photosynthesis in rice leaves. However, a cell image revealing the three-dimensional (3-D) ultrastructure of rice mesophyll cells has not been visualized...
April 21, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28444098/the-cerebrospinal-fluid-in-multiple-sclerosis-far-beyond-the-bands
#3
Renan Barros Domingues, Gustavo Bruniera Peres Fernandes, Fernando Brunale Vilela de Moura Leite, Charles Peter Tilbery, Rodrigo Barbosa Thomaz, Gisele Sampaio Silva, Cristóvão Luis Pitangueira Mangueira, Carlos Augusto Senne Soares
The cerebrospinal fluid analysis has been employed for supporting multiple sclerosis diagnosis and ruling out the differential diagnoses. The most classical findings reflect the inflammatory nature of the disease, including mild pleocytosis, mild protein increase, intrathecal synthesis of immunoglobulin G, and, most typically, the presence of oligoclonal bands. In recent years, new biomarkers have emerged in the context of multiple sclerosis. The search for new biomarkers reflect the need of a better evaluation of disease activity, disease progression, and treatment efficiency...
January 2017: Einstein
https://www.readbyqxmd.com/read/28444082/ii-brazilian-consensus-on-the-use-of-human-immunoglobulin-in-patients-with-primary-immunodeficiencies
#4
Ekaterini Simões Goudouris, Almerinda Maria do Rego Silva, Aluce Loureiro Ouricuri, Anete Sevciovic Grumach, Antonio Condino-Neto, Beatriz Tavares Costa-Carvalho, Carolina Cardoso de Mello Prando, Cristina Maria Kokron, Dewton de Moraes Vasconcelos, Fabíola Scancetti Tavares, Gesmar Rodrigues Silva Segundo, Irma Cecília Douglas Paes Barreto, Mayra de Barros Dorna, Myrthes Anna Maragna Toledo Barros, Wilma Carvalho Neves Forte
In the last few years, new primary immunodeficiencies and genetic defects have been described. Recently, immunoglobulin products with improved compositions and for subcutaneous use have become available in Brazil. In order to guide physicians on the use of human immunoglobulin to treat primary immunodeficiencies, based on a narrative literature review and their professional experience, the members of the Primary Immunodeficiency Group of the Brazilian Society of Allergy and Immunology prepared an updated document of the 1st Brazilian Consensus, published in 2010...
2017: Einstein
https://www.readbyqxmd.com/read/28444063/effect-of-lactation-on-myocardial-vulnerability-to-ischemic-insult-in-rats
#5
Sahar Askari, Alireza Imani, Hamidreza Sadeghipour, Mahdieh Faghihi, Zohreh Edalatyzadeh, Samira Choopani, Nasser Karimi, Sulail Fatima
Background: Cardiovascular diseases are the leading cause of mortality and long-term disability worldwide. Various studies have suggested a protective effect of lactation in reducing the risk of cardiovascular diseases. Objective: This study was designed to assess the effects of pregnancy and lactation on the vulnerability of the myocardium to an ischemic insult. Methods: Eighteen female rats were randomly divided into three groups: ischemia-reperfusion (IR), in which the hearts of virgin rats underwent IR (n = 6); lactating, in which the rats nursed their pups for 3 weeks and the maternal hearts were then submitted to IR (n = 6); and non-lactating, in which the pups were separated after birth and the maternal hearts were submitted to IR (n = 6)...
April 20, 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28444018/effect-of-nanotechnology-in-self-etch-bonding-systems-on-the-shear-bond-strength-of-stainless-steel-orthodontic-brackets
#6
Shaza M Hammad, Noha El-Wassefy, Ahmed Maher, Shafik M Fawakerji
OBJECTIVE: To evaluate the effect of silica dioxide (SiO2) nanofillers in different bonding systems on shear bond strength (SBS) and mode of failure of orthodontic brackets at two experimental times. METHODS: Ninety-six intact premolars were divided into four groups: A) Conventional acid-etch and primer Transbond XT; B) Transbond Plus self-etch primer; and two self-etch bonding systems reinforced with silica dioxide nanofiller at different concentrations: C) Futurabond DC at 1%; D) Optibond All-in-One at 7%...
February 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/28443654/quantifying-the-self-assembly-behavior-of-anisotropic-nanoparticles-using-liquid-phase-transmission-electron-microscopy
#7
Binbin Luo, John W Smith, Zihao Ou, Qian Chen
For decades, one of the overarching objectives of self-assembly science has been to define the rules necessary to build functional, artificial materials with rich and adaptive phase behavior from the bottom-up. To this end, the computational and experimental efforts of chemists, physicists, materials scientists, and biologists alike have built a body of knowledge that spans both disciplines and length scales. Indeed, today control of self-assembly is extending even to supramolecular and molecular levels, where crystal engineering and design of porous materials are becoming exciting areas of exploration...
April 26, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28443500/occurrence-of-tem-shv-and-ctx-m-%C3%AE-lactamases-in-clinical-isolates-of-proteus-species-in-a-tertiary-care-center
#8
Mohit Chaubey, Suchitra Shenoy
BACKGROUND: Extended spectrum beta lactamases (ESBL) are responsible for increased resistance to third generation cephalosporins. Proteus species is an important cause of both community acquired and nosocomial infections. The Proteus spp is usually susceptible to beta lactam drugs but there is progressive increase in beta lactam resistance and recently ESBLs are also fast spreading to this species. OBJECTIVE: This study was conducted to study ESBL production and occurrence of TEM, SHV and CTX M beta lactamases in clinical isolates of Proteus spp in a tertiary care centre...
April 25, 2017: Infectious Disorders Drug Targets
https://www.readbyqxmd.com/read/28443364/green-synthesis-of-nano-zero-valent-iron-from-nettle-and-thyme-leaf-extracts-and-their-application-for-the-removal-of-cephalexin-antibiotic-from-aqueous-solutions
#9
Mostafa Leili, Mehdi Fazlzadeh, Amit Bhatnagar
In this study, the removal of cephalexin (CEX) antibiotic from aqueous solution was examined using a novel green adsorbent without employing any toxic chemicals or capping agents. Nettle and Thyme extracts were used to synthesize novel nano zero-valent iron (NNZVI and TNZVI) for the adsorption of CEX. The nature and morphology of synthesized adsorbent were characterized by TEM, SEM, XRD and FTIR spectroscopy. Batch experiments were performed to study the influence of various experimental parameters such as contact time, initial concentration of the CEX, solution pH and adsorbent dosage...
April 26, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28442746/ultrastructural-characterization-of-the-lower-motor-system-in-a-mouse-model-of-krabbe-disease
#10
Valentina Cappello, Laura Marchetti, Paola Parlanti, Silvia Landi, Ilaria Tonazzini, Marco Cecchini, Vincenzo Piazza, Mauro Gemmi
Krabbe disease (KD) is a neurodegenerative disorder caused by the lack of β- galactosylceramidase enzymatic activity and by widespread accumulation of the cytotoxic galactosyl-sphingosine in neuronal, myelinating and endothelial cells. Despite the wide use of Twitcher mice as experimental model for KD, the ultrastructure of this model is partial and mainly addressing peripheral nerves. More details are requested to elucidate the basis of the motor defects, which are the first to appear during KD onset. Here we use transmission electron microscopy (TEM) to focus on the alterations produced by KD in the lower motor system at postnatal day 15 (P15), a nearly asymptomatic stage, and in the juvenile P30 mouse...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28442174/microstructural-alterations-owing-to-handling-of-bovine-pericardium-to-manufacture-bioprosthetic-heart-valves-a-potential-risk-for-cusp-dehiscence
#11
J Mao, Y Wang, E Philippe, T Cianciulli, I Vesely, D How, J-M Bourget, L Germain, Z Zhang, R Guidoin
INTRODUCTION: Cross-linking and anti-calcification of prosthetic heart valves have been continuously improved to prevent degeneration and calcification. However, non-calcific structural deteriorations such as cuspal dehiscences along the stent still require further analysis. MATERIAL AND METHOD: Based upon the previous analysis of an explanted valve after 7 years, a fresh commercial aortic valve was embedded in poly(methyl methacrylate) (PMMA) and cut into slices to ensure the detailed observation of the assembly and material structures...
April 22, 2017: Morphologie: Bulletin de L'Association des Anatomistes
https://www.readbyqxmd.com/read/28441606/growth-inhibition-and-antibiofilm-potential-of-ag-nanoparticles-coated-with-lectin-an-arthropod-immune-molecule
#12
Sangily Jayanthi, Sathappan Shanthi, Baskaralingam Vaseeharan, Narayanan Gopi, Marimuthu Govindarajan, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Giovanni Benelli
Lectins from the haemolymph of arthropods, including crustaceans, are molecules potentially involved in the immune recognition and phagocytosis. Here, lectin was purified from the haemolymph of blue swimmer crab Portunus pelagicus, using mannose-coupled sepharose CL-4B affinity column chromatography. In SDS-PAGE analysis, lectin showed a molecular mass of approximately 155kDa. The synthesis of lectin-coated silver nanoparticles (lectin-coated AgNPs) was confirmed by UV-Vis spectroscopy, XRD, FTIR, SEM, TEM, SAED, and EDX analysis...
April 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28440835/the-generation-of-compartmentalized-nanoparticles-containing-sirna-and-cisplatin-using-a-multi-needle-electrohydrodynamic-strategy
#13
Maria F Pina, Wai Lau, Kathrin Scherer, Maryam Parhizkar, Mohan Edirisinghe, Duncan Craig
This study outlines a novel manufacturing technique for the generation of compartmentalized trilayered nanoparticles loaded with an anti-cancer agent and siRNA as a platform for the combination treatment of cancers. More specifically, we describe the use of a multi-needle electrohydrodynamic approach to produce nanoparticles with high size specificity and scalable output, while allowing suitable environments for each therapeutic agent. The inner polylactic-glycolic-acid (PLGA) layer was loaded with cisplatin while the middle chitosan layer was loaded with siRNA...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440581/the-toxicity-of-silver-to-soil-organisms-exposed-to-silver-nanoparticles-and-silver-nitrate-in-biosolids-amended-field-soil
#14
Alexander H Jesmer, Jessica R Velicogna, Dina M Schwertfeger, Richard P Scroggins, Juliska I Princz
The use of engineered silver nanoparticles (AgNP) is widespread, with expected release to the terrestrial environment through the application of biosolids onto agricultural lands. The toxicity of AgNP and AgNO3 (as ionic Ag(+) ) to plant (Elymus lanceolatus and Trifolium pratense) and soil invertebrate (Eisenia andrei and Folsomia candida) species was assessed using silver-amended biosolids applied to a natural sandy loam soil. Bioavailable Ag(+) in soil samples was estimated using an ion-exchange technique applied to KNO3 soil extracts while exposure to dispersible AgNP was verified by single particle-ICP-MS and TEM-EDS analysis...
April 25, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28440567/dawson-type-polyoxomolybdate-anions-p2mo18o626-captured-by-ionic-liquid-on-graphene-oxide-as-high-capacity-anode-material-for-lithium-ion-batteries
#15
Yu-Fei Song, Jun Hu, Hongling Diao, Wenjing Luo
The development of advanced anode materials is of significance for the next generation of lithium ion batteries (LIBs). Herein, the imidazolium-based ionic liquids (ILs) was covalently grafted on the surface of graphene oxides (GO) via the carboxyl-amino bond,providing a loading hotbed for the Dawson-type POM of (NH4)6P2Mo18O62 (denoted as P2Mo18). The as-prepared GO-IL-P2Mo18 nanocomposite was characterized by FT-IR, Raman, TGA, SEM, TEM and XPS. When the nanocomposite was used as the anode material for lithium ion batteries (LIBs), it showed a high reversible capacity of 903...
April 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28440366/improved-electrical-conductivity-of-tpu-carbon-black-composites-by-addition-of-copa-and-selective-localization-of-carbon-black-at-the-interface-of-sea-island-structured-polymer-blends
#16
Qiyan Zhang, Jingxia Wang, Jian Yu, Zhao-Xia Guo
The electrical percolation threshold of carbon black (CB) in thermoplastic polyurethane (TPU) decreases by 46% with the incorporation of 20 wt% polyamide copolymer (COPA) through selective localization of CB particles at the interface of sea-island structured TPU/COPA blends. Composites with a composition of TPU/20 wt% COPA/9 wt% CB were prepared by four different mixing sequences and their morphologies were investigated by FESEM and TEM. The majority of CB particles were observed at the interface of sea-island structured blends irrespective of the compounding sequence used, although the percentage of CB particles at the interface is considerably less in the composite prepared by adding COPA to premixed TPU/CB...
April 25, 2017: Soft Matter
https://www.readbyqxmd.com/read/28439929/the-roles-of-autophagy-and-hypoxia-in-human-inflammatory-periapical-lesions
#17
H Y Huang, W C Wang, P Y Lin, C P Huang, C Y Chen, Y K Chen
AIM: To determine the expressions of hypoxia-related [hypoxia-inducible transcription factors (HIF)-1α, BCL2/adenovirus E1B 19 kDa protein-interacting protein 3 (BNIP3), and phospho-adenosine monophosphate activated protein kinase (pAMPK)] and autophagy-related [microtubule-associated protein 1 light chain 3 (LC3), beclin-1 (BECN-1), autophagy-related gene (Atg)5-12, and p62] proteins in human inflammatory periapical lesions. METHODOLOGY: Fifteen samples of radicular cysts (RCs) and 21 periapical granulomas (PGs), combined with 17 healthy dental pulp tissues were examined...
April 25, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28438022/improvements-in-nanoparticle-tracking-analysis-to-measure-particle-aggregation-and-mass-distribution-a-case-study-on-engineered-nanomaterial-stability-in-incineration-landfill-leachates
#18
Kamyar Mehrabi, Bernd Nowack, Yadira Arroyo Rojas Dasilva, Denise M Mitrano
Numerous nanometrology techniques have been developed in recent years to determine the size, concentration and a number of other characteristics of engineered nanomaterials (ENM) in environmental matrices. Among the many available techniques, Nanoparticle Tracking Analysis (NTA) can measure individual particles to create a size distribution and measure the particle number. Therefore, we explore the possibility to use these data to calculate the particle mass distribution. Additionally, we further developed the NTA methodology to explore its suitability for analysis of ENM in complex matrices by measuring ENM agglomeration and sedimentation in municipal solid waste incineration landfill leachates over time...
April 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28438011/electrical-and-optical-properties-of-au-catalyzed-gaas-nanowires-grown-on-si-111-substrate-by-molecular-beam-epitaxy
#19
Chiu-Yen Wang, Yu-Chen Hong, Zong-Jie Ko, Ya-Wen Su, Jin-Hua Huang
In this study, defect-free zinc blende GaAs nanowires on Si (111) by molecular beam epitaxy (MBE) growth are systematically studied through Au-assisted vapor-liquid-solid (VLS) method. The morphology, density, and crystal structure of GaAs nanowires were investigated as a function of substrate temperature, growth time, and As/Ga flux ratio during MBE growth, as well as the thickness, annealing time, and annealing temperature of Au film using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), cathodoluminescence (CL), and Raman spectroscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28437724/synthesis-of-zno-nanorod-based-materials-for-antibacterial-antifungal-activities-dna-cleavage-and-efficient-ultrasound-assisted-dyes-adsorption
#20
Ali Akbar Bazrafshan, Mehrorang Ghaedi, Shaaker Hajati, Reza Naghiha, Arash Asfaram
Undoped and Au-doped ZnO-nanorods were synthesized in the presence of ultrasound and loaded on activated carbon following characterization by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), UV-vis spectrophotometry and Fourier transform infrared spectroscopy (FTIR). The Au-doped ZnO-nanorod-loaded activated carbon (Au-ZnO-NRs-AC) was used for the simultaneous removal of methylene blue (MB) and auramine O (AO) from aqueous solutions. Central composite design (CCD) under response surface methodology (RSM) was applied to model and optimize the dyes removal versus adsorbent mass, pH, and initial dyes concentration and sonication time as well as to investigate the possible interaction between these variables...
April 21, 2017: Ecotoxicology and Environmental Safety
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