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https://www.readbyqxmd.com/read/29771681/selective-adsorption-of-oppositely-charged-pnipaam-on-halloysite-surfaces-a-route-to-thermo-responsive-nanocarriers
#1
Giuseppe Cavallaro, Giuseppe Lazzara, Lorenzo Lisuzzo, Stefana Milioto, Filippo Parisi
Halloysite nanotubes were functionalized with stimuli-responsive macromolecules to generate smart nanohybrids. Poly(N-isopropylacrylamide)-co-methacrylic acid (PNIPAAM-co-MA) was selectively adsorbed into halloysite lumen by exploiting electrostatic interactions. Amine-terminated PNIPAAM polymer was also investigated that selectively interacts with the outer surface of the nanotubes. The adsorption site has a profound effect on the thermodynamic behavior and therefore temperature responsive features of the hybrid material...
May 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29764987/rapid-and-dynamic-alternative-splicing-impacts-the-arabidopsis-cold-response-transcriptome
#2
Cristiane P G Calixto, Wenbin Guo, Allan B James, Nikoleta A Tzioutziou, Juan C Entizne, Paige E Panter, Heather Knight, Hugh Nimmo, Runxuan Zhang, John W S Brown
Plants have adapted to tolerate and survive constantly changing environmental conditions by re-programming gene expression. The dynamics of the contribution of alternative splicing (AS) to stress responses are unknown. RNA-sequencing of a time-series of Arabidopsis thaliana plants exposed to cold determines the timing of significant AS changes. This shows a massive and rapid AS response with coincident waves of transcriptional and AS activity occurring in the first few hours of temperature reduction, and further AS throughout the cold...
May 15, 2018: Plant Cell
https://www.readbyqxmd.com/read/29762009/wavelength-modulated-back-scatter-interferometry-for-universal-on-column-refractive-index-detection-in-picoliter-volumes
#3
Robert C Dunn
Wavelength modulated back scatter interferometry (M-BSI) is shown to improve the detection metrics for refractive index (RI) sensing in micro-separations. In M-BSI, the output of a tunable diode laser is focused into the detection zone of a separation channel as the excitation wavelength is rapidly modulated. This spatially modulates the observed interference pattern, which is measured in the back-scattered direction. Using a split photodiode detector aligned on one fringe of the of interference pattern, phase-sensitive detection is used to monitor RI changes as analytes are separated...
May 15, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29761912/proteinase-pattern-of-honeybee-prepupae-from-healthy-and-american-foulbrood-infected-bees-investigated-by-zymography-the-numbered-spots-figure-4-were-excised-from-the-gels-and-they-were-individually-transferred-to-a-1-5-ml-microcentrifuge-tube-spots-were-destained
#4
Proteinase pattern of honeybee prepupae from healthy and American Foulbrood infected bees investigated by zymography: The numbered spots (figure 4) were excised from the gels and they were individually transferred to a 1.5 mL microcentrifuge tube. Spots were destained and proteins digested as reported by Dani et al. 40. Each peptide mixture was submitted to capillary-LC-μESI-MS/MS analysis on an Ultimate 3000 HPLC (Dionex, San Donato Milanese, Milano, Italy) coupled to a LTQ Orbitrap mass spectrometer (Thermo Fisher, Bremen, Germany). Peptides were concentrated on a precolumn cartridge PepMap100 C18 (300 μm i.d. × 5 mm, 5 μm, 100 Å, LC Packings Dionex) and then eluted on a homemade capillary column packed with Aeris Peptide XB-C18 phase (180 μm i.d. × 15 cm, 3.6 μm, 100 Å, Phenomenex, Torrance, CA, USA) at 1 μl/min. The loading mobile phases were: 0.1% TFA in H 2 O (phase A) and 0.1% TFA in CH 3 CN (phase B). The elution mobile phases composition was: H 2 O 0.1% formic acid/CH 3 CN 97/3 (phase A) and CH 3 CN 0.1% formic acid/ H 2 O 97/3 (phase B). The elution program was: 0 min, 4% B; 10 min, 40% B; 30 min, 65% B; 35 min, 65% B; 36 min, 90% B; 40 min, 90% B; 41 min, 4%B; 60 min, 4% B. Mass spectra were acquired in positive ion mode, setting the spray voltage at 1.8 kV, the capillary voltage and temperature respectively at 45 V and 200°C, and the tube lens at 130 V. Data were acquired in data-dependent mode with dynamic exclusion enabled (repeat count 2, repeat duration 15 s, exclusion duration 30 s); survey MS scans were recorded in the Orbitrap analyzer in the mass range 300-2000 m/z at a 15,000 nominal resolution at m/z = 400; then up to three most intense ions in each full MS scan were fragmented (isolation width 3 m/z, normalized collision energy 30) and analyzed in the IT analyzer. Monocharged ions did not trigger MS/MS experiments.
Antonio Felicioli, Barbara Turchi, Filippo Fratini, Matteo Giusti, Roberta Nuvoloni, Francesca Romana Dani, Simona Sagona
American foulbrood disease (AFB) is the main devastating disease that affects honeybees' brood, caused by Paenibacillus larvae. The trend of the research on AFB has addressed the mechanisms by which P. larvae bacteria kill honeybee larvae. Since prepupae could react to the infection of AFB by increasing protease synthesis, the aim of this work was to compare protease activity in worker prepupae belonging to healthy colonies and to colonies affected by AFB. This investigation was performed by zymography. In gel, proteolytic activity was observed in prepupae extracts belonging to the healthy colonies...
May 15, 2018: Electrophoresis
https://www.readbyqxmd.com/read/29747109/characterization-of-airborne-particles-emitted-by-an-electrically-heated-tobacco-smoking-system
#5
A Pacitto, L Stabile, M Scungio, V Rizza, G Buonanno
Smoking activities were recognized as a main risk factor for population. Indeed, mainstream smoke aerosol is directly inhaled by smokers then delivering harmful compounds in the deepest regions of the lung. In order to reduce the potential risk of smoking, different nicotine delivery products have been recently developed. The latest device released is an electrically heated tobacco system (iQOS® , Philip Morris) which is able to warm the tobacco with no combustion. In the present paper a dimensional and volatility characterization of iQOS-generated particles was performed through particle number concentration and distribution measurements in the mainstream aerosol...
May 7, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29745604/-the-preparation-and-study-on-drug-release-of-a-triply-responsive-redox-thermo-ph-cross-linked-polymeric-micelle-as-anti-cancer-drug-carrier
#6
Jing Qu, Kanglong Chen, Qiuyue Wang, Juan Lin, Qinghan Zhou
A multiple-stimuli-responsive drug-conjugated cross-linked micelles was prepared by radical copolymerization. The chemical structure, morphology, and size of the cross-linked micelles were characterized, and the drug loading of the micelle was calculated. The experimental results indicated that the hydrodynamic size of the drug-loaded micelles were about 100 nm, and the as prepared micelles could be degraded and swelled in presence of reducing glutathione (GSH). The low critical solution temperature (LCST) of the micelle was around 39...
February 1, 2018: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29733199/nanosystems-based-on-magnetic-nanoparticles-and-thermo-or-ph-responsive-polymers-an-update-and-future-perspectives
#7
Binh T Mai, Soraia Fernandes, Preethi B Balakrishnan, Teresa Pellegrino
Combining hard matter, like inorganic nanocrystals, and soft materials, like polymers, can generate multipurpose materials with a broader range of applications with respect to the individual building blocks. Given their unique properties at the nanoscale, magnetic nanoparticles (MNPs) have drawn a great deal of interest due to their potential use in the biomedical field, targeting several applications such as heat hubs in magnetic hyperthermia (MHT, a heat-damage based therapy), contrast agents in magnetic resonance imaging (MRI), and nanocarriers for targeted drug delivery...
May 7, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29727646/improved-catalytic-properties-of-a-serine-hydroxymethyl-transferase-from-idiomarina-loihiensis-by-site-directed-mutagenesis
#8
Ashok Kumar, Gaobing Wu, Zuo Wu, Ziduo Liu
A novel glyA gene was screened from a marine bacterium, Idiomarina loihiensis encoding a thermo-stable serine hydroxymethyl transferase (SHMT; 418 AA; 45.4 kDa). The activities of wild type (WT) and mutants were analyzed against d-phenylserine using pyrodoxal-5-phosphate (PLP) as cofactor under optimized conditions. Based on homology modelling and molecular docking, several residues were found that may be able to improve the activity of WT-SHMT. Site directed mutagenesis was conducted. The activity and thermostability of the wild type SHMT was improved by two variants H61G and G132P, which showed a noteworthy change in the thermo-stability and activity as compared to WT...
May 1, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29727607/rediscovery-of-otto-frank-s-contribution-to-science
#9
REVIEW
Johann P Kuhtz-Buschbeck, Angela Drake-Holland, Mark I M Noble, Brigitte Lohff, Jochen Schaefer
In the late 19th century, German physiologist Otto Frank (1865-1944) embarked on a near life-long research program of laying down the mathematical, methodological, and theoretical foundations in order to understand and define the performance of the heart and circulatory system in all their complexity. The existence of the "Frank-Starling law" testifies to this. Two of his seminal publications have been translated into English previously, introducing Frank's research on the dynamics of the heart and the arterial pulse to a wider audience...
May 1, 2018: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29726569/thermo-plasmonic-gold-nanofilms-for-simple-and-mass-producible-photothermal-neural-interfaces
#10
Jee Woong Lee, Hongki Kang, Yoonkey Nam
In recent years, photothermal stimulation methods using plasmonic metal nanoparticles have emerged as non-genetic optical techniques in neuromodulation. Although nanoparticle-based photothermal stimulation shows great potential in the excitation and the inhibition of neural activity, the complex synthesis processes of the nanoparticles and the lack of large-area deposition methods can be limiting factors for the development of photothermal neural devices. In this paper, we propose a plasmonic gold nanofilm, fabricated by a standard thermal evaporation process, as a simple and mass-producible photothermal neural interface layer for microelectrode array (MEA) chips...
May 4, 2018: Nanoscale
https://www.readbyqxmd.com/read/29721439/recent-approaches-in-food-bio-preservation-a-review
#11
REVIEW
Veer Pal Singh
Bio-preservation is a technique of extending the shelf life of food by using natural or controlled microbiota or antimicrobials. The fermentation products as well as beneficial bacteria are generally selected in this process to control spoilage and render pathogen inactive. The special interest organism or central organism used for this purpose is lactic acid bacteria (LAB) and their metabolites. They are capable to exhibit antimicrobial properties and helpful in imparting unique flavour and texture to the food products...
2018: Open Veterinary Journal
https://www.readbyqxmd.com/read/29705508/biosynthesis-of-iron-nanoparticles-using-trigonella-foenum-graecum-seed-extract-for-photocatalytic-methyl-orange-dye-degradation-and-antibacterial-applications
#12
Ibrahim Ali Radini, Nazim Hasan, Maqsood Ahmad Malik, Zaheer Khan
Trigonella foenum-graecum is the source of various biological and chemical constituents with a wide area of applications, especially in the treatment/prevention of diabetes and other chronic diseases such as cancer. Multiple biological and organic moieties in the aqueous or the organic phase of Trigonella foenum-graecum carry soft reduction properties to reduce the metal cations to nanoparticles. In this investigation, the Trigonella foenum-graecum was found in the seed extract for the first time in an aqueous medium...
April 17, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29702316/modelling-the-sporulation-of-some-fungi-associated-with-cheese-at-different-temperature-and-water-activity-regimes
#13
Marco Camardo Leggieri, Simone Decontardi, Paola Battilani
The objectives of this study were to determine, in-vitro, the influence of temperature (T; 10-30 °C, step 5°), water activity (aw , 0.83-0.99; step 0.04) and time on sporulation (SPO) of some cheese-related fungi belonging to Penicillium spp. and A. versicolor. Overall, sporulation started rapidly (8 h in optimal conditions); it was significantly influenced by T and aw and the fungi studied were clearly distinguished based on their thermo-hydro adaptation. Boundary conditions for sporulation were defined for all the fungi considered and the sporulation rate was successfully modelled, especially based on T and time regimes...
April 19, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29694840/synthesis-and-characterization-of-cross-linked-enzyme-aggregates-of-serine-hydroxyl-methyltransferase-from-idiomerina-leihiensis
#14
Ashok Kumar, Gaobing Wu, Ziduo Liu
A thermo-stable purified serine hydroxymethyltransferase (SHMT; 418 AA) was used for the carrier free immobilization using pectin as a coach molecule and formaldehyde as a cross-linker. The purified protein was cross linked with formaldehyde in the presence of pectin to form stable and active aggregates. The cross-linked enzyme aggregates [CLEAs] of SHMT showed improved catalytic properties and reusability. The SHMT-CLEAs showed a noteworthy change in the thermo-stability and activity compared to its free counterpart...
April 22, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29686504/evaluation-of-a-novel-thermo-alkaline-staphylococcus-aureus-lipase-for-application-in-detergent-formulations
#15
Abir Ben Bacha, Alaa Al-Assaf, Nadine M S Moubayed, Islem Abid
An extracellular lipase of a newly isolated S. aureus strain ALA1 (SAL4) was purified from the optimized culture medium. The SAL4 specific activity determined at 60 °C and pH 12 by using olive oil emulsion or TC4, reached 7215 U/mg and 2484 U/mg, respectively. The 38 NH2 -terminal amino acid sequence of the purified enzyme starting with two extra amino acid residues (LK) was similar to known staphylococcal lipase sequences. This novel lipase maintained almost 100% and 75% of its full activity in a pH range of 4...
March 2018: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/29683219/response-of-consumer-and-research-grade-indoor-air-quality-monitors-to-residential-sources-of-fine-particles
#16
Brett C Singer, William W Delp
The ability to inexpensively monitor PM2.5 to identify sources and enable controls would advance residential indoor air quality (IAQ) management. Consumer IAQ monitors incorporating low-cost optical particle sensors and connections with smart home platforms could provide this service if they reliably detect PM2.5 in homes. In this study, particles from typical residential sources were generated in a 120 m3 laboratory and time-concentration profiles were measured with seven consumer monitors (2-3 units each), two research monitors (Thermo pDR-1500, MetOne BT-645), a Grimm Mini Wide-Range Aerosol Spectrometer (GRM), and a Tapered Element Oscillating Microbalance with Filter Dynamic Measurement System (FDMS), a federal equivalent method (FEM) for PM2...
April 23, 2018: Indoor Air
https://www.readbyqxmd.com/read/29680617/a-novel-highly-selective-and-sensitive-detection-of-serotonin-based-on-ag-polypyrrole-cu-2-o-nanocomposite-modified-glassy-carbon-electrode
#17
S Selvarajan, A Suganthi, M Rajarajan
A silver/polypyrrole/copper oxide (Ag/PPy/Cu2 O) ternary nanocomposite was prepared by sonochemical and oxidative polymerization simple way, in which Cu2 O was decorated with Ag nanoparticles, and covered by polyprrole (PPy) layer. The as prepared materials was characterized by UV-vis-spectroscopy (UV-vis), FT-IR, X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM) with EDX, high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS)...
June 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29676637/epigenomic-alterations-and-gene-expression-profiles-in-human-respiratory-epithelial-cells-mediated-by-hookah-and-cigarette-smoke
#18
Yin Xiong, Sichuan Xi, Jigui Shan, Elvin Hekimoglu, Shih-Hsin Hsiao, Mary Zhang, Julie A Hong, Chris Tao, Haobin Chen, R Taylor Ripley, Chuong D Hoang, David S Schrump
RATIONALE: The effects of hookah smoke on respiratory epithelia have not been well characterized. OBJECTIVES: To characterize and compare the effects of hookah tobacco smoke and conventional cigarette smoke on the epigenome and transcriptome of human respiratory epithelia. METHODS: Normal human small airway epithelial cells and cyclin-dependent kinase 4/human telomerase reverse transcriptase-immortalized human bronchial epithelial cells were cultured for 5 days in normal media in the presence or absence of water pipe condensates or cigarette smoke condensates under relevant exposure conditions...
April 2018: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/29675837/batch-bioethanol-production-via-the-biological-and-chemical-saccharification-of-some-egyptian-marine-macroalgae
#19
Ramadan M Soliman, Sherif A Younis, Nour Sh El-Gendy, Soha S M Mostafa, Seham A El-Temtamy, Ahmed I Hashim
AIMS: Marine seaweeds (macroalgae) cause eutrophication problem and affects the touristic activities. The success of the production of the third generation bioethanol from marine macroalgae depends mainly on the development of an ecofriendly and eco-feasible pretreatment (i.e. hydrolysis) technique, a highly effective saccharification step and finally an efficient bioethanol fermentation step. Therefore, this study aimed to investigate the potentiality of different marine macroalgal strains, collected from Egyptian coasts, for bioethanol production via different saccharification processes...
April 19, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29656084/a-sensitive-and-rapid-ultra-high-performance-liquid-chromatography-with-tandem-mass-spectrometric-assay-for-the-simultaneous-quantitation-of-cyclophosphamide-and-the-4-hydroxycyclophosphamide-metabolite-in-human-plasma
#20
O Morgan Hall, Cody J Peer, Courtney D Fitzhugh, William D Figg
Analysis of cyclophosphamide (CP) and its metabolite, 4-hydroxycyclophosphamide (4OHCP), in a single assay has the ability to improve sampling techniques benefitting both the patients who are receiving the drug and the clinicians drawing samples. Due to instability in plasma (t1/2  = 4 min), immediate stabilization of 4OHCP with phenylhydrazine is necessary upon sample draw. After stabilization, 4OHCP and the stable CP prodrug concentrations can be analytically measured to elucidate the pharmacokinetics, including half-life and exposure parameters (Cmax and AUC)...
April 10, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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