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Francesca Malvano, Luigi Maritato, Giovanni Carapella, Pasquale Orgiani, Roberto Pilloton, Marisa Di Matteo, Donatella Albanese
Due to their interesting ferroelectric, conductive and dielectric properties, in recent years, perovskite-structured materials have begun to attract increasing interest in the biosensing field. In this study, a strontium titanate perovskite layer (SrTiO₃) has been synthesized on a platinum electrode and exploited for the development of an impedimetric label-free immunosensor for Escherichia coli O157:H7 detection. The electrochemical characterization of the perovskite-modified electrode during the construction of the immunosensor, as well as after the interaction with different E...
March 16, 2018: Biosensors
Vladimir Anatolievich Chistyakov, Evgeniya Valer'evna Prazdnova, Maria Sergeevna Mazanko, Anzhelica Borisovna Bren
A model system based on the Escherichia coli MG1655 (pRecA-lux) Lux-biosensor was used to evaluate the ability of the fermentates of eight probiotic strains to reduce the SOS response stimulated by ciprofloxacin in bacteria and mutagenesis mediated by it. Preliminary attempts to estimate the chemical nature of active components of the fermentates were conducted.
March 16, 2018: Biosensors
Yongpeng Yao, Shanshan Li, Jiaqian Cao, Weiwei Liu, Keqiang Fan, Wensheng Xiang, Keqian Yang, Deming Kong, Weishan Wang
Here, we demonstrate an easy-to-implement and general biosensing strategy by coupling the small-molecule recognition of the bacterial allosteric transcription factor (aTF) with isothermal strand displacement amplification (SDA) in vitro. Based on this strategy, we developed two biosensors for the detection of an antiseptic, p-hydroxybenzoic acid, and a disease marker, uric acid, using bacterial aTF HosA and HucR, respectively, highlighting the great potential of this strategy for the development of small-molecule biosensors...
March 16, 2018: Chemical Communications: Chem Comm
D Xie, W F Zhu, H Cheng, Z Y Yao, M Li, Y L Zhao
A sensitive, and single step reaction assay of glycoproteins in antibody-free mode was proposed on a 4-mercapto-phenylboronic acid (4-MPBA) modified silver nanoparticle film (AgNF) by using surface enhanced Raman scattering (SERS). 4-MPBA/AgNF was designed both as a glycoprotein-specific recognition biosensor and as a Raman reporter for the SERS platform. Variation in the ratio I1574/I1586 for 4-MPBA/AgNF in response to glycoprotein capture constitutes the SERS assay which exhibits high sensitivity and selectivity against nonglycoproteins and is shown to function in complex samples...
March 16, 2018: Physical Chemistry Chemical Physics: PCCP
Joo-Yong Hahn, Young Bin Song, Ju-Hyeon Oh, Deok-Kyu Cho, Jin Bae Lee, Joon-Hyung Doh, Sang-Hyun Kim, Jin-Ok Jeong, Jang-Ho Bae, Byung-Ok Kim, Jang Hyun Cho, Il-Woo Suh, Doo-Il Kim, Hoon-Ki Park, Jong-Seon Park, Woong Gil Choi, Wang Soo Lee, Jihoon Kim, Ki Hong Choi, Taek Kyu Park, Joo Myung Lee, Jeong Hoon Yang, Jin-Ho Choi, Seung-Hyuk Choi, Hyeon-Cheol Gwon
BACKGROUND: Current guidelines recommend dual antiplatelet therapy (DAPT) of aspirin plus a P2Y12 inhibitor for at least 12 months after implantation of drug-eluting stents (DES) in patients with acute coronary syndrome. However, available data about the optimal duration of DAPT in patients with acute coronary syndrome undergoing percutaneous coronary intervention are scant. We aimed to investigate whether a 6-month duration of DAPT would be non-inferior to the conventional 12-month or longer duration of DAPT in this population...
March 9, 2018: Lancet
Yan-Mei Lei, Bai-Qi Xiao, Wen-Bin Liang, Ya-Qin Chai, Ruo Yuan, Ying Zhuo
It is well known that the conventional electrochemiluminescence (ECL) biosensor rely on the heterogeneous assay formats that involves the immobilization of biorecognition probe on the electrode surface before signal collection, which inevitably cause the efficiency of bio-recognition reactions to be limited owing to the existence of local steric hindrance. Herein, a robust, magnetic, and self-accelerated ECL nanosensor based on the multifunctionalized cobalt ferrite magnetite nanoparticles (CoFe2 O4 MNPs) was firstly designed for copper ion (Cu2+ ) detection in quasi-homogeneous system...
March 7, 2018: Biosensors & Bioelectronics
Felix A Blyakhman, Nikita A Buznikov, Tatyana F Sklyar, Alexander P Safronov, Elizaveta V Golubeva, Andrey V Svalov, Sergey Yu Sokolov, Grigory Yu Melnikov, Iñaki Orue, Galina V Kurlyandskaya
Hydrogels are biomimetic materials widely used in the area of biomedical engineering and biosensing. Ferrogels (FG) are magnetic composites capable of functioning as magnetic field sensitive transformers and field assisted drug deliverers. FG can be prepared by incorporating magnetic nanoparticles (MNPs) into chemically crosslinked hydrogels. The properties of biomimetic ferrogels for multifunctional biosensor applications can be set up by synthesis. The properties of these biomimetic ferrogels can be thoroughly controlled in a physical experiment environment which is much less demanding than biotests...
March 15, 2018: Sensors
Eva Vargas, Eloy Povedano, Víctor Ruiz-Valdepeñas Montiel, Rebeca M Torrente-Rodríguez, Mohamed Zouari, Juan José Montoya, Noureddine Raouafi, Susana Campuzano, José M Pingarrón
This work reports an amperometric biosensor for the determination of miRNA-21, a relevant oncogene. The methodology involves a competitive DNA-target miRNA hybridization assay performed on the surface of magnetic microbeads (MBs) and amperometric transduction at screen-printed carbon electrodes (SPCEs). The target miRNA competes with a synthetic fluorescein isothiocyanate (FITC)-modified miRNA with an identical sequence for hybridization with a biotinylated and complementary DNA probe (b-Cp) immobilized on the surface of streptavidin-modified MBs (b-Cp-MBs)...
March 15, 2018: Sensors
Jeevan K Pant, Sridhar Krishnan
OBJECTIVE: To present a new compressive sensing (CS)-based method for the acquisition of ECG signals and for robust estimation of heart-rate variability (HRV) parameters from compressively sensed measurements with high compression ratio. APPROACH: CS is used in the biosensor to compress the ECG signal. Estimation of the locations of QRS segments is carried out by applying two algorithms on the compressed measurements. The first algorithm reconstructs the ECG signal by enforcing a block-sparse structure on the first-order difference of the signal, so the transient QRS segments are significantly emphasized on the first-order difference of the signal...
March 15, 2018: Physiological Measurement
Sencer Ayas, Gokhan Bakan, Erol Ozgur, Kemal Celebi, Gamze Torunoglu, Aykutlu Dana
Metal films covered with ultrathin lossy dielectrics can exhibit strong interference effects manifested as the broad absorption of the incident light resulting in distinct surface colors. Despite their simple bilayer structures, such surfaces have only recently been scrutinized and applied mainly to color printing. Here, we report the use of such surfaces for colorimetric detection of ultrathin dielectrics. Upon deposition of a nanometer-thick dielectric on the surface, the absorption peak red shifts, changing the surface color...
March 15, 2018: Optics Letters
Sheta M Sheta, Said M El-Sheikh, Mohkles M Abd-Elzaher
Novel copper metal organic framework nanoparticles Cu-MOF-NPs (C1) were prepared via two simple alternative methods and confirmed by analytical characterization using mass, IR, Raman, XRD spectrum, HR-TEM and TGA-DSC. Mass spectroscopy revealed the molecular ion peak at 647 m/z for the monomeric unit structure n[Cu(AIP)2 (PIY)(H2 O)2 ]·4H2 O, the presence of which was further supported by mass fragmentation. The Raman spectrum revealed two separate peaks corresponding to D and G bands of carbon in the structure of C1...
March 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Katherine D Hills, Daniela A Oliveira, Nicholas D Cavallaro, Carmen L Gomes, Eric S McLamore
We demonstrate a sensing mechanism for rapid detection of Listeria monocytogenes in food samples using the actuation of chitosan-aptamer nanobrush borders. The bio-inspired soft material and sensing strategy mimic natural symbiotic systems, where low levels of bacteria are selectively captured from complex matrices. To engineer this biomimetic system, we first develop reduced graphene oxide/nanoplatinum (rGO-nPt) electrodes, and characterize the fundamental electrochemical behavior in the presence and absence of chitosan nanobrushes during actuation (pH-stimulated osmotic swelling)...
March 15, 2018: Analyst
Laurel M Oldach, Kirill Gorshkov, William T Mills, Jin Zhang, Mollie K Meffert
Intracellular levels of the RNA-binding protein and pluripotency factor, Lin28a, are tightly controlled to govern cellular and organismal growth. Lin28a is extensively regulated at the post-transcriptional level, and can undergo mitogen-activated protein kinase (MAPK)-mediated elevation from low basal levels in differentiated cells by phosphorylation-dependent stabilizing interaction with the RNA-silencing factor HIV TAR-RNA-binding protein (TRBP). However, molecular and spatio-temporal details of this critical control mechanism remained unknown...
March 14, 2018: Molecular Biology of the Cell
Deepti Chaturvedi, Radhakrishnan Mahalakshmi
Transmembrane β-barrel proteins (OMPs) are highly robust structures for engineering and development of nanopore channels, surface biosensors, and display libraries. Expanding the applications of designed OMPs requires the identification of elements essential for β-barrel scaffold formation and stability. Here, we have designed chimeric 8-stranded OMPs composed of strand hybrids of Escherichia coli OmpX and Yersinia pestis Ail, and identified molecular motifs essential for β-barrel scaffold formation. For the OmpX/Ail chimeras, we find that the central hairpin strands β4-β5 in tandem are vital for β-barrel folding...
March 14, 2018: Biochemistry
William G Robichaux, Xiaodong Cheng
This review focuses on one family of the known cAMP receptors, the exchange proteins directly activated by cAMP (EPACs), also known as the cAMP-regulated guanine nucleotide exchange factors (cAMP-GEFs). Although EPAC proteins are fairly new additions to the growing list of cAMP effectors, and relatively "young" in the cAMP discovery timeline, the significance of an EPAC presence in different cell systems is extraordinary. The study of EPACs has considerably expanded the diversity and adaptive nature of cAMP signaling associated with numerous physiological and pathophysiological responses...
April 1, 2018: Physiological Reviews
Cláudia Manuela Botelho, Odete Gonçalves, Rogério Marques, Viruthachalam Thiagarajan, Henrik Vorum, Andreia Castro Gomes, Maria Teresa Neves-Petersen
Epidermal Growth Factor Receptor (EGFR) plays a key role in regulating cell survival, proliferation and migration, and its overexpression and activation has been correlated with cancer progression. Cancer therapies targeting EGFR have been applied in the clinic with some success. We show, by confocal microscopy analysis, that illumination of adenocarcinomic human alveolar basal epithelial cells (Human A549 - EGFR biosensor cell line) with 280 nm at irradiance levels up to 20 times weaker than the UVB solar output for short periods of time (15-45 min) prevents EGF-mediated activation of EGFR located on the cell membrane, preventing or reducing cellular disaggregation, formation of filopodia and cell migration...
March 14, 2018: Journal of Biophotonics
Joonchul Shin, Sudesna Chakravarty, Wooseok Choi, Kyungyeon Lee, Dongsik Han, Hyundoo Hwang, Jaekyu Choi, Hyo-Il Jung
The emergence of a wide range of applications of smartphones along with advances in 'liquid biopsy' has significantly propelled medical research particularly in the field of in vitro diagnostics (IVD). Herein, we have presented a detailed analysis of IVD, its associated critical concerns and probable solutions. It also demonstrates the transition in terms of analytes from minimally invasive (blood) to non-invasive (urine, saliva and sweat) and depicts how the different features of a smartphone can be integrated for specific diagnostic purposes...
March 14, 2018: Analyst
Mehdi Yoosefian, Nazanin Etminan
We have designed a novel nanobiosensor for in silico detecting proteins based on leucine/Pd-loaded single-walled carbon nanotube matrix. Density functional theory at the B3LYP/6-31G (d) level of theory was realized to analyze the geometrical and electronic structure of the proposed nanobiosensor. The solvent effects were investigated using the Tomasi's polarized continuum model. Atoms-in-molecules theory was used to study the nature of interactions by calculating the electron density ρ(r) and Laplacian at the bond critical points...
March 14, 2018: Amino Acids
T Azad, H J Janse van Rensburg, E D Lightbody, B Neveu, A Champagne, A Ghaffari, V R Kay, Y Hao, H Shen, B Yeung, B A Croy, K L Guan, F Pouliot, J Zhang, C J B Nicol, X Yang
The Hippo pathway is a central regulator of tissue development and homeostasis, and has been reported to have a role during vascular development. Here we develop a bioluminescence-based biosensor that monitors the activity of the Hippo core component LATS kinase. Using this biosensor and a library of small molecule kinase inhibitors, we perform a screen for kinases modulating LATS activity and identify VEGFR as an upstream regulator of the Hippo pathway. We find that VEGFR activation by VEGF triggers PI3K/MAPK signaling, which subsequently inhibits LATS and activates the Hippo effectors YAP and TAZ...
March 13, 2018: Nature Communications
Badrinath Jagannath, Sriram Muthukumar, Shalini Prasad
We have investigated the role of kosmotropic anionic moieties and chaotropic cationic moieties of room temperature hydrophilic ionic liquids in enhancing the biosensing performance of affinity based immunochemical biosensors in human sweat. Two ionic liquids, 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM[BF4 ]) and choline dihydrogen phosphate (Choline[DHP]) were investigated in this study with Choline[DHP] being more kosmotropic in nature having a more protein stabilizing effect based on the hofmeister series...
August 3, 2018: Analytica Chimica Acta
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