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MCH blue

Qinhua Chen, Wanbao Hu, Bing Shang, Jian Wei, Long Chen, Xiaojun Guo, Fengying Ran, Wei Chen, Xueru Ding, Ying Xu, Yinhua Wu
An amperometric aptasensor is reported for the electrochemical determination of the epithelial cell adhesion molecule (EpCAM). It is based on a combination of EpCAM-driven toehold-mediated DNA recycling amplification, the specific recognition of EpCAM aptamer, and its binding to EpCAM. Hairpin probe 1 (Hp1) with a toehold region was modified with a 5'-thiol group (5'-SH) and self-assembled onto the surface of a gold electrode. Upon addition of EpCAM, the probe A (a 15-mer) is liberated from the aptamer/probe A complex and then hybridizes with the toehold domain of Hp1...
March 1, 2018: Mikrochimica Acta
L Franco-Belussi, C De Oliveira, H N Sköld
Fish can change their skin and eye colour for background matching and signalling. Males of Gasterosteus aculeatus develop ornamental blue eyes and a red jaw during the reproductive season, colours that are further enhanced during courtship. Here, the effects of different hormones on physiological colour changes in the eyes and jaws of male and female G. aculeatus were investigated in vitro. In an in vivo experiment, G. aculeatus were injected with a receptor blocker of a pivotal hormone (noradrenaline) that controls colour change...
March 25, 2018: Journal of Fish Biology
Himadri Saha, Asim Kumar Pal, Narottam Prasad Sahu, Ratan Kumar Saha, Pritam Goswami
Fluconazole (FLZ) is a new azole antifungal drug having no earlier record of its utilization for the treatment of fish diseases. A 55-days experiment was carried out to delineate the role of FLZ based medicated feed on haemato-immunological responses and prevention of fungal infection in Labeo rohita fingerlings. Three hundred and sixty fingerlings were randomly distributed into four experimental groups in triplicates. Four iso-caloric and iso-nitrogenous purified medicated feeds were prepared with 0, 100, 200 and 300 mg FLZ 100 g(-1) feed...
September 28, 2017: Fish & Shellfish Immunology
Ahmed I Nossier, Ola S Mohammed, Rasha R Fakhr El-Deen, Ashraf S Zaghloul, Sanaa Eissa
Matrix metalloproteinases (MMPs), in particularly gelatinases (MMP-2 and MMP-9) were reported as urinary markers of bladder cancer. In this work, we developed a simple colorimetric gold nanoparticle (AuNP) assay for rapid and sensitive detection of urinary total gelatinase activity based on the surface plasmon resonance (SPR) property of AuNPs. Gelatin-modified AuNPs were stably suspended in solution even upon addition of an aggregation inducer as 6-mercaptohexan-1-ol (6-MCH). Gelatinases digest gelatin capping...
December 1, 2016: Talanta
Himadri Saha, Asim Kumar Pal, Narottam Prasad Sahu, Ratan Kumar Saha
A 60-day experiment was carried out to delineate the role of dietary pyridoxine (DP) in Labeo rohita fingerlings in modulating immunity and prevention of fungal infection. Two hundred and seventy fingerlings were randomly distributed into three treatments in triplicates. Three iso-caloric and iso-nitrogenous purified diets were prepared with graded levels of pyridoxine. Three experimental groups were C (0.0% DP), T1 (0.01% DP) and T2 (0.02% DP). The role of dietary pyridoxine in modulating immunity and prevention of fungal infection was assessed by haemato-immunological parameters like erythrocyte counts (EC), leucocyte counts (LC), haemoglobulin (Hb), packed cell volume (PCV), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC), nitro-blue tetrazolium (NBT), phagocytic activity, albumin, globulin, total plasma protein, albumin/globulin and by challenge study with Saprolegnia parasitica, where relative percentage survival (RPS) were recorded...
December 2016: Fish & Shellfish Immunology
Joanna Zajda, Łukasz Górski, Elżbieta Malinowska
A simple and cost effective method for the determination of restriction endonuclease activity is presented. dsDNA immobilized at a gold electrode surface is used as the enzymatic substrate, and an external cationic redox probe is employed in voltammetric measurements for analytical signal generation. The assessment of enzyme activity is based on a decrease of a current signal derived from reduction of methylene blue which is present in the sample solution. For this reason, the covalent attachment of the label molecule is not required which significantly reduces costs of the analysis and simplifies the entire determination procedure...
June 2016: Bioelectrochemistry
Murat Aydemir, Gülçin Haykır, Figen Türksoy, Selçuk Gümüş, Fernando B Dias, Andy P Monkman
A novel series of donor-acceptor-donor (D-A-D) structured pyridine derivatives were synthesised and detailed photo-physical investigations were made using mainly steady-state and time-resolved spectroscopy techniques at varying temperatures. The investigations showed that the molecules have solvent polarity and temperature dependent excited-state configurations, confirmed in two different polarity solvents (295-90 K), i.e. methyl cyclohexane (MCH) and 2-methyltetrahdrofurane (2-MeTHF). In MCH, the investigations revealed dual fluorescence over the temperature range of 295-90 K...
October 14, 2015: Physical Chemistry Chemical Physics: PCCP
Wei Wen, Rong Hu, Ting Bao, Xiuhua Zhang, Shengfu Wang
In this work, a sensitive exonuclease-assisted amplification electrochemical aptasensor through insertion approach was developed for the detection of mucin 1 (MUC 1). In order to construct the aptasensor, 6-Mercapto-1-hexanol (MCH) was used to block partial sites of gold electrode (GE), followed by thiolated capture probe self-assembled on GE. Methylene blue (MB) labeled aptamer hybridized with capture probe at both ends to form double-strand DNA. For the MB labeled termini was close to GE, the electrochemical response was remarkable...
September 15, 2015: Biosensors & Bioelectronics
Malgorzata Witeska, Joanna Dudyk, Natalia Jarkiewicz
OBJECTIVE: To evaluate the effects of handling alone versus handling under anaesthesia with 2-phenoxyethanol or etomidate on haematological parameters in carp. STUDY DESIGN: Prospective, randomized, laboratory experiment. ANIMALS: Seventy-two juvenile carp (Cyprinus carpio) weighing 35.9 ± 10.4 g were divided into six groups of 12 fish. METHODS: Either 2-phenoxyethanol or 2% etomidate were administered to induce deep anaesthesia (0...
September 2015: Veterinary Anaesthesia and Analgesia
Fernando F B Lima, Luciane V Sita, Amanda R Oliveira, Helder C Costa, Joelcimar M da Silva, Renato A Mortara, Carlos A S Haemmerle, Gilberto F Xavier, Newton S Canteras, Jackson C Bittencourt
Melanin-concentrating hormone (MCH) and neuropeptide glutamic acid-isoleucine (NEI) are expressed in neurons that are located mainly in the hypothalamus and project widely throughout the rat central nervous system. One of the main targets of melanin-concentrating hormone is the hippocampal formation, although the exact origin of the projections is unknown. By using injections of the retrograde tracer True Blue into the hippocampus, together with immunohistochemical analysis, we observed retrogradely labeled melanin-concentrating hormone-containing neurons in the lateral hypothalamic area, incerto-hypothalamic area, perifornical area, the periventricular nucleus of the hypothalamus, and in the internuclear area (between the dorsomedial and ventromedial nuclei of the hypothalamus), as well as a few retrogradely labeled and melanin-concentrating hormone-immunoreactive cells in the supramammillary nucleus...
January 2013: Journal of Chemical Neuroanatomy
Cheng-Yu Lee, Kuan-Ying Wu, Hsiu-Li Su, Huan-Yi Hung, You-Zung Hsieh
In this study, we developed an ultrasensitive label-free aptamer-based electrochemical biosensor, featuring a highly specific anti-human immunoglobulin E (IgE) aptamer as a capture probe, for human IgE detection. Construction of the aptasensor began with the electrodeposition of gold nanoparticles (AuNPs) onto a graphite-based screen-printed electrode (SPE). After immobilizing the thiol-capped anti-human IgE aptamer onto the AuNPs through self-assembly, we treated the electrode with mercaptohexanol (MCH) to ensure that the remaining unoccupied surfaces of the AuNPs would not undergo nonspecific binding...
January 15, 2013: Biosensors & Bioelectronics
Renu Singh, G Sumana, Rachna Verma, Seema Sood, M K Pandey, Rajinder K Gupta, B D Malhotra
A sequence-specific electrochemical sexually transmitted disease (STD) sensor based on self-assembled monolayer of thiolated DNA probe specific to target opa gene for detection of Gonorrhoea, a sexually transmitted disease has been fabricated. 6-Mercapto-1-hexanol (MCH) has been used as a blocking agent to facilitate oligos "stand" up at the surface, a configuration favoring subsequent DNA hybridization and to repel non-specific adsorption of undesired DNA. The results of differential pulse voltammetric studies of this STD sensor reveal low detection limit (1...
November 2010: Journal of Biotechnology
Guangyan Yan, Yinglan Zhao, Pengchi Deng, Lei Lv, Yanli Wang, Qian Bu, Bin Liu, Chunyan Hu, Yanqiang Zhuo, Xunning Yang, Li Wang, Xiaobo Cen
In this study, clinical biochemistry, hematology, histopathology and (1)H nuclear magnetic resonance spectroscopy-based metabonomic approaches were applied to investigate the toxicological effects of Shuanghuanglian (SHL) injection after intravenous administration (dosed at 4, 12 and 36 mL stock/kg) in Beagle dogs for 30 d. Decreases in red blood cells, hemoglobin, mean cell volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were observed in the high-dose group. Elevated reticulocytes, total bilirubin and direct bilirubin were also observed in this group...
November 2010: Experimental Biology and Medicine
M Tichoniuk, D Gwiazdowska, M Ligaj, M Filipiak
The paper describes an electrochemical DNA biosensor used for the detection of Aeromonas hydrophila. This opportunistic pathogen is recognized as an emerging foodborne hazard and is associated with a variety of virulence factors including production of cytotoxic enterotoxin aerolysin. The genosensor recognition layer was prepared using mixed self-assembled monolayer (SAM) consisting of thiolated single-stranded DNA probe (ssDNA) and diluent molecules--mercaptoalcohol: mercaptoethanol (MCE) or mercaptohexanol (MCH) or mercaptononanol (MCN)...
December 15, 2010: Biosensors & Bioelectronics
Yao-Chen Chuang, Jung-Chun Li, Sz-Hau Chen, Ting-Yu Liu, Ching-Han Kuo, Wei-Ting Huang, Chih-Sheng Lin
The surface plasmon resonance (SPR) wavelength of colloidal gold nanoparticles (AuNPs) can vary when the AuNPs aggregate, have different sizes or shapes, or are modified with chemical molecules. In this study, an optical biosensing platform for a proteinase activity assay was established based on the SPR property of AuNPs. The 13-nm AuNPs were modified with gelatin (AuNPs-gelatin) as a proteinase substrate and subsequently modified with 6-mercaptohexan-1-ol (MCH) (AuNPs/MCH-gelatin). After proteinase (trypsin or gelatinase) digestion, the AuNPs lose shelter, and MCH increases the attractive force between the modified AuNPs...
August 2010: Biomaterials
O Y F Henry, J Gutierrrez Perez, J Lluis Acero Sanchez, C K O'Sullivan
The realisation of efficient genosensors relies crucially on the surface chemistry strategy selected for the immobilisation of DNA probes. We report on the performance of surfaces prepared via the direct co-immobilisation of a 20-nucleotide (nt) thiolated single stranded DNA probe (ssDNA) in the presence of the short alkanethiol mercaptohexanol (MCH) at varying ratio. Electrochemical impedance spectroscopy was used for the physical characterisation of the formed monolayers. Functional characterisation of the surfaces was achieved by means of differential pulse voltammetry and calibration curves in the range 6...
January 15, 2010: Biosensors & Bioelectronics
Nicole I Stacy, Mary B Nabity, Nicole Hackendahl, Melanie Buote, Jennifer Ward, Pamela E Ginn, William Vernau, William L Clapp, John W Harvey
Two young adult dogs with gastrointestinal signs were each found to have an intra-abdominal mass based on physical examination and diagnostic imaging. On exploratory laparotomy, small intestinal masses and mesenteric lymphadenopathy were found in both dogs; a liver mass was also found in dog 1. Cytologic and histologic examination of intestinal and liver masses and mesenteric lymph nodes revealed 2 distinct lymphoid cell populations: lymphoblasts and atypical Mott cells. With Romanowsky stains, the atypical Mott cells contained many discrete, clear to pale blue cytoplasmic inclusions consistent with Russell bodies that were positive by immunohistochemistry for IgM and CD79a in both dogs and for IgG in dog 2...
March 2009: Veterinary Clinical Pathology
Oscar A Loaiza, Susana Campuzano, María Pedrero, José M Pingarrón
A novel approach to construct an electrochemical DNA sensor based on immobilization of a 25 base single-stranded probe, specific to E. coli lac Z gene, onto a gold disk electrode is described. The capture probe is covalently attached using a self-assembled monolayer of 3,3'-dithiodipropionic acid di(N-succinimidyl ester) (DTSP) and mercaptohexanol (MCH) as spacer. Hybridization of the immobilized probe with the target DNA at the electrode surface was monitored by square wave voltammetry (SWV), using methylene blue (MB) as electrochemical indicator...
October 31, 2007: Talanta
V Dharuman, Jong Hoon Hahn
Electrochemical label free DNA hybridization discrimination of the brain tumor sequence CK20 has been made at the gold-thiol and thiol diluent binary and ternary mixed monolayer interfaces in presence of the [Fe(CN)6](3-) and double stranded DNA (dsDNA) specific cationic intercalators, proflavine (PF) and methylene blue (MB), respectively. Thiol hexane labeled single stranded DNA (HS-ssDNA) and thiol diluents such as 6-mercapto-1-hexanol (MCH) and 3-mercaptopropionic acid (MPA) are used to construct the mixed monolayers...
March 14, 2008: Biosensors & Bioelectronics
Galina V Loukova, Svetlana E Starodubova, Vyatcheslav A Smirnov
For a class of pi-complexes as energy donors, with the use of highly emissive d(0) metallocenes Cp(2)MCl(2) where M = Zr and Hf, it is shown that radiationless triplet energy transfer to unsaturated hydrocarbons in a rigid nonpolar methylcyclohexane (MCH) matrix (where molecular diffusion is absent) obeys the Perrin equation, occurs at radii R(0), being close to the diameter of interacting molecules, and is well described by an electron-exchange resonant (Dexter) mechanism of interaction. Principle correlation between values of the critical radius and a number of C atoms in a linear alpha-olefin is for the first time reported, viz...
November 1, 2007: Journal of Physical Chemistry. A
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