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https://www.readbyqxmd.com/read/28323423/bioinspired-layer-by-layer-microcapsules-based-on-cellulose-nanofibers-with-switchable-permeability
#1
Thomas Paulraj, Anastasia V Riazanova, Kun Yao, Richard L Andersson, Anette Müllertz, Anna J Svagan
Green, all-polysaccharide based microcapsules with mechanically robust capsule walls and fast, stimuli-triggered and switchable permeability behaviour show great promise in applications based on selective and timed permeability. Taking cue from nature, the build-up and composition of plant primary cell wall inspired the capsule wall assembly, because the primary cell walls in plants exhibit high mechanical properties despite being in a highly hydrated state, primarily owing to cellulose microfibrils. The microcapsules (16 ± 4 µm in diameter) were fabricated using the Layer-by-Layer technique on sacrificial CaCO3 templates, using plant polysaccharides (pectin, cellulose nanofibers and xyloglucan) only...
March 21, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28322210/mycolactone-producing-mycobacterium-marinum-infection-in-captive-hong-kong-warty-newts-and-pathological-evidence-of-impaired-host-immune-function
#2
Wen-Ta Li, Hui-Wen Chang, Victor Fei Pang, Fun-In Wang, Chen-Hsuan Liu, Ting-Yu Chen, Jun-Cheng Guo, Takayuki Wada, Chian-Ren Jeng
A mass mortality event of captive Hong Kong warty newts Paramesotriton hongkongensis with non-granulomatous necrotic lesions occurred in Taipei Zoo, Taiwan, in 2014. Clinically, the sick newts were lethargic and often covered with water mold Saprolegnia sp. on the skin of the body trunk or extremities. Predominant pathological findings were multifocal non-granulomatous necrotic lesions in the liver, spleen, and kidneys and severe skin infection with Saprolegnia sp., with deep invasion and involvement of underlying muscles...
March 21, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28317258/centrifugeless-ultrasound-assisted-emulsification-microextraction-based-on-salting-out-phenomenon-followed-by-high-performance-liquid-chromatography-for-the-simple-determination-of-phthalate-esters-in-aqueous-samples
#3
Ehsan Mirparizi, Maryam Rajabi, Mohammad Bazregar, Alireza Asghari
A fast, sensitive, and centrifugeless ultrasound-assisted emulsification microextraction followed by high performance liquid chromatography method is developed for the determination of some phthalate esters in aqueous samples. In this method, a simple approach is followed for elimination of the centrifugation step in dispersive liquid-liquid microextraction using an organic solvent whose melting point is near the ambient temperature, consumption of the extracting solvent is efficiently reduced, and the overall extraction time was found to be only 7 min...
March 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28315236/detection-of-ketones-by-a-novel-technology-dipolar-proton-transfer-reaction-mass-spectrometry-dp-ptr-ms
#4
Yue Pan, Qiangling Zhang, Wenzhao Zhou, Xue Zou, Hongmei Wang, Chaoqun Huang, Chengyin Shen, Yannan Chu
Proton transfer reaction mass spectrometry (PTR-MS) has played an important role in the field of real-time monitoring of trace volatile organic compounds (VOCs) due to its advantages such as low limit of detection (LOD) and fast time response. Recently, a new technology of proton extraction reaction mass spectrometry (PER-MS) with negative ions OH(-) as the reagent ions has also been presented, which can be applied to the detection of VOCs and even inorganic compounds. In this work, we combined the functions of PTR-MS and PER-MS in one instrument, thereby developing a novel technology called dipolar proton transfer reaction mass spectrometry (DP-PTR-MS)...
March 17, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28304077/alternative-electron-transport-mediated-by-flavodiiron-proteins-is-operational-in-organisms-from-cyanobacteria-up-to-gymnosperms
#5
Petr Ilík, Andrej Pavlovič, Roman Kouřil, Alessandro Alboresi, Tomas Morosinotto, Yagut Allahverdiyeva, Eva-Mari Aro, Hiroshi Yamamoto, Toshiharu Shikanai
Photo-reduction of O2 to water mediated by flavodiiron proteins (FDPs) represents a safety valve for the photosynthetic electron transport chain in fluctuating light. So far, the FDP-mediated O2 photo-reduction has been evidenced only in cyanobacteria and the moss Physcomitrella; however, a recent phylogenetic analysis of transcriptomes of photosynthetic organisms has also revealed the presence of FDP genes in several nonflowering plant groups. What remains to be clarified is whether the FDP-dependent O2 photo-reduction is actually operational in these organisms...
March 17, 2017: New Phytologist
https://www.readbyqxmd.com/read/28303707/assessment-of-nutritional-habits-and-preferences-among-secondary-school-students
#6
Paulina Duma-Kocan, Barbara Barud, Elżbieta Głodek, Marian Gil
Background: Appropriate nutrition is one of the most important factors affecting the proper development of man, nutritional status and maintaining good health. Adolescence is a period of development of skills of self-determination and self-realization, also in the case of nutrition. Children and school-age youth are the group most vulnerable to the effects of incorrect nutrition. The way of nutrition during this period determines psychophysical and emotional development, effectiveness in learning process and has influence on health in adulthood...
2017: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/28282160/fast-dynamics-of-water-droplets-freezing-from-the-outside-in
#7
Sander Wildeman, Sebastian Sterl, Chao Sun, Detlef Lohse
A drop of water that freezes from the outside in presents an intriguing problem: the expansion of water upon freezing is incompatible with the self-confinement by a rigid ice shell. Using high-speed imaging we show that this conundrum is resolved through an intermittent fracturing of the brittle ice shell and cavitation in the enclosed liquid, culminating in an explosion of the partially frozen droplet. We propose a basic model to elucidate the interplay between a steady buildup of stresses and their fast release...
February 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28277954/physiological-responses-to-fasting-and-estivation-for-the-three-toed-amphiuma-amphiuma-tridactylum
#8
Matthew E Smith, Stephen M Secor
Species of Amphiuma enter a state of subterranean estivation with the drying of their aquatic habitat. Characteristic of amphibian fasting and estivation is an initial depression of metabolism and tissue mass and function with fasting, followed by a more pronounced adaptive decrease in metabolism and tissue function with estivation. We hypothesized that Amphiuma likewise experiences a two-stage set of responses to estivation. Therefore, we examined the physiological responses of the three-toed amphiuma (Amphiuma tridactylum) to fasting and estivation treatments...
March 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28272785/cest-imaging-of-fast-exchanging-amine-pools-with-corrections-for-competing-effects-at-9-4%C3%A2-t
#9
Xiao-Yong Zhang, Feng Wang, Hua Li, Junzhong Xu, Daniel F Gochberg, John C Gore, Zhongliang Zu
Chemical exchange saturation transfer (CEST) imaging of fast exchanging amine protons at 3 ppm offset from the water resonant frequency is of practical interest, but quantification of fast exchanging pools by CEST is challenging. To effectively saturate fast exchanging protons, high irradiation powers need to be applied, but these may cause significant direct water saturation as well as non-specific semi-solid magnetization transfer (MT) effects, and thus decrease the specificity of the measured signal. In addition, the CEST signal may depend on the water longitudinal relaxation time (T1w ), which likely varies between tissues and with pathology, further reducing specificity...
March 8, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28267913/ultrasonic-removal-of-mucilage-for-pressurized-liquid-extraction-of-omega-3-rich-oil-from-chia-seeds-salvia-hispanica-l
#10
Natalia Castejón, Pilar Luna, Francisco J Señoráns
Chia (Salvia hispanica L.) seeds contain an important amount of edible oil rich in omega-3 fatty acids. Fast and alternative extraction techniques based on polar solvents, such as ethanol or water, have become relevant for oil extraction in recent years. However, chia seeds also contain a large amount of soluble fiber or mucilage, which makes difficult an oil extraction process with polar solvents. For that reason, the aim of this study was to develop a gentle extraction method for mucilage in order to extract chia oil with polar solvents using pressurized liquids and compare with organic solvent extraction...
March 7, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28250588/fast-recovery-of-transgenic-submergence-tolerant-rice-cultivars-of-north-east-india-by-early-co-cultivation-of-agrobacterium-with-pre-cultured-callus
#11
Van Cuu Nguyen, Van Khiem Nguyen, Chongtham Henary Singh, Guruaribam Shantibala Devi, Vanga Siva Reddy, Sadhu Leelavathi
Agro-climatic conditions of North-East India are very complex and rice cultivars present in the region have been adapted to grow under harsh environmental conditions. Germplasm present in the region is considered to possess several important and unique traits that are of importance in rice improvement programs. Genetic engineering is a powerful tool to introduce new traits into crop plants. However, not much information is available on the methods to introduce foreign genes into North-East rice cultivars. Therefore, the main objective of this study is to develop transformation procedures for fast recovery of transgenic plants from North-East rice cultivars...
January 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/28240548/graphene-oxide-involved-air-controlled-electrospray-for-uniform-fast-instantly-dry-and-binder-free-electrode-fabrication
#12
Ling Fei, Sang Ha Yoo, Rachel Ann R Villamayor, Brian P Williams, Seon Young Gong, Sunchan Park, Kyusoon Shin, Yong Lak Joo
We report a facile air-controlled electrospray method to directly deposit binder-free active materials/graphene oxide (GO) onto current collectors. This method is inspired from an electrospinning process, and possesses all the advantages that electrospinning has such as low cost, easy scaling up, and simultaneous solvent evaporation during the spraying process. Moreover, the spray slurry is only a simple mixture of active materials and GO suspension in water, no binder polymer, organic solvent, and conductive carbon required...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28235460/tyrozine-d-oxidation-and-redox-equilibrium-in-photosystem-ii
#13
Nigar Ahmadova, Felix Ho, Stenbjorn Styring, Fikret Mamedov
Tyrosine D (TyrD) is an auxiliary redox active tyrosine residue in photosystem II (PsiI). The mechanism of TyrD oxidation was investigated by EPR spectroscopy, flash-induced fluorescence decay and thermoluminescence measurements in PsiI enriched membranes from spinach. PsiI membranes were chemically treated with 3mM ascorbate and 1mM diaminodurene and subsequent washing, leading to the complete reduction of TyrD. TyrD oxidation kinetics and competing recombination reactions were measured after a single saturating flash in the absence and presence of DCMU (inhibitor of the QB-site) in the pH range of 4...
February 21, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28228689/athyrium-haleakalae-athyriaceae-a-new-rheophytic-fern-species-from-east-maui-hawaiian-islands-with-notes-on-its-distribution-ecology-and-conservation-status
#14
Kenneth R Wood, Warren L Wagner
Athyrium haleakalae K.R. Wood & W.L. Wagner (Athyriaceae), a small lithophytic fern from East Maui, Hawaiian Islands, is described and illustrated. Notes on its distribution, ecology, and conservation status are also presented. The new species appears to be an obligate rheophyte, preferring sites of fast moving water along concave walls of streams and waterfalls. Athyrium haleakalae differs from the only other known Hawaiian Athyrium, Athyrium microphyllum (Sm.) Alston, in having rhizomes 1-3 cm long and lanceolate blades 1- to 2-pinnate-pinnatifid, 3-8(-11) × 1-3(-4) cm, as compared to Athyrium microphyllum having rhizomes (10-)15-30 cm long and ovate to ovate-triangular blades 3-pinnate-pinnatifid to 4-pinnate, 30-82 × 20-50 cm...
2017: PhytoKeys
https://www.readbyqxmd.com/read/28224247/a-simplified-lc-ms-ms-method-for-rapid-determination-of-cycloserine-in-small-volume-human-plasma-using-protein-precipitation-coupled-with-dilution-techniques-to-overcome-matrix-effects-and-its-application-to-a-pharmacokinetic-study
#15
Zhengsheng Mao, Xin Wang, Bingxin Li, Jing Jin, Ming Xu, Youping Liu, Xin Di
Matrix effects have been a major concern when developing LC-MS/MS methods for quantitative bioanalysis of cycloserine. Sample handling procedures including solid phase extraction or derivatization have been reported previously by researchers to overcome matrix effects of cycloserine. In the present study, the possibility of reducing matrix effects of cycloserine using protein precipitation coupled with dilution techniques was investigated. Plasma samples were pretreated by protein precipitation with methanol followed by a 40-fold dilution with methanol-water (50:50, v/v)...
April 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28220111/identity-abundance-and-reactivation-kinetics-of-thermophilic-fermentative-endospores-in-cold-marine-sediment-and-seawater
#16
Marta Volpi, Bente Aa Lomstein, Andreas Sichert, Hans Røy, Bo B Jørgensen, Kasper U Kjeldsen
Cold marine sediments harbor endospores of fermentative and sulfate-reducing, thermophilic bacteria. These dormant populations of endospores are believed to accumulate in the seabed via passive dispersal by ocean currents followed by sedimentation from the water column. However, the magnitude of this process is poorly understood because the endospores present in seawater were so far not identified, and only the abundance of thermophilic sulfate-reducing endospores in the seabed has been quantified. We investigated the distribution of thermophilic fermentative endospores (TFEs) in water column and sediment of Aarhus Bay, Denmark, to test the role of suspended dispersal and determine the rate of endospore deposition and the endospore abundance in the sediment...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28211267/efficient-and-selective-uptake-of-tco4-by-a-cationic-metal-organic-framework-material-with-open-ag-sites
#17
Daopeng Sheng, Lin Zhu, Chao Xu, Chengliang Xiao, Yanlong Wang, Yaxing Wang, Lanhua Chen, Juan Diwu, Jing Chen, Zhifang Chai, Thomas E Albrecht-Schmitt, Shuao Wang
(99)Tc is one of the most problematic radioisotopes in used nuclear fuel owing to its combined features of high fission yield, long half-life, and high environmental mobility. There are only a handful of functional materials that can remove TcO4(-) anion from aqueous solution and identifying for new, stable materials with high anion-exchange capacities, fast kinetics, and good selectivity remains a challenge. We report here an 8-fold interpenetrated three-dimensional cationic metal-organic framework material, SCU-100, which is assembled from a tetradentate neutral nitrogen-donor ligand and two-coordinate Ag(+) cations as potential open metal sites...
March 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28207408/evaluation-of-cannabinoids-concentration-and-stability-in-standardized-preparations-of-cannabis-tea-and-cannabis-oil-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#18
Roberta Pacifici, Emilia Marchei, Francesco Salvatore, Luca Guandalini, Francesco Paolo Busardò, Simona Pichini
BACKGROUND: Cannabis has been used since ancient times to relieve neuropathic pain, to lower intraocular pressure, to increase appetite and finally to decrease nausea and vomiting. The combination of the psychoactive cannabis alkaloid Δ9-tetrahydrocannabinol (THC) with the non-psychotropic alkaloids cannabidiol (CBD) and cannabinol (CBN) demonstrated a higher activity than THC alone. The Italian National Institute of Health sought to establish conditions and indications on how to correctly use nationally produced cannabis to guarantee therapeutic continuity in individuals treated with medical cannabis...
February 16, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28177544/hso2-formation-from-ion-molecule-reactions-of-so2-with-water-and-methane-two-fast-reactions-with-reverse-temperature-dependent-kinetic-trend
#19
Antonella Cartoni, Daniele Catone, Paola Bolognesi, Mauro Satta, Pal Markus, Lorenzo Avaldi
In this work an experimental and theoretical study on the formation of HSO2+ ion from the SO2.+ + CH4 and SO2.+ + H2O ion-molecule reactions at different temperatures is reported. Tunable synchrotron radiation has been used to produce the SO2.+ ion in excited ro-vibrational levels of the ionic ground state X2A1 and mass spectrometry has been employed to identify the product ions. Calculations in the frame of the density functional theory and variational transtition state theory have been combined to explore the dynamics of the reactions...
February 8, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28158227/beneficial-effects-of-metformin-on-energy-metabolism-and-visceral-fat-volume-through-a-possible-mechanism-of-fatty-acid-oxidation-in-human-subjects-and-rats
#20
Ichiro Tokubuchi, Yuji Tajiri, Shimpei Iwata, Kento Hara, Nobuhiko Wada, Toshihiko Hashinaga, Hitomi Nakayama, Hiroharu Mifune, Kentaro Yamada
OBJECTIVE: Metformin is known to have a beneficial effect on body weight and body composition, although the precise mechanism has not been elucidated yet. The aim of this study is to investigate the effects of metformin on energy metabolism and anthropometric factors in both human subjects and rats. METHODS: In human studies, metformin (1500mg/day) was administered to 23 healthy subjects and 18 patients with type 2 diabetes for 2 weeks. Metabolic parameters and energy metabolism were measured during a meal tolerance test in the morning before and after the treatment of metformin...
2017: PloS One
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