A novel colorimetric triple-helix molecular switch aptasensor based on peroxidase-like activity of gold nanoparticles for ultrasensitive detection of lead(ii)

RSC Advances ◽  
2015 ◽  
Vol 5 (54) ◽  
pp. 43508-43514 ◽  
Author(s):  
Seyed Mohammad Taghdisi ◽  
Noor Mohammad Danesh ◽  
Parirokh Lavaee ◽  
Ahmad Sarreshtehdar Emrani ◽  
Mohammad Ramezani ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Gold Nanoparticles ◽  
Triple Helix ◽  
Molecular Switch ◽  
Environmental Contaminant ◽  
Ultrasensitive Detection ◽  
Toxic Heavy Metals

Lead (Pb) is a serious environmental contaminant and one of the most toxic heavy metals.

Triple-helix molecular-switch-actuated exponential rolling circular amplification for ultrasensitive fluorescence detection of miRNAs

The Analyst ◽  
2019 ◽  
Vol 144 (17) ◽  
pp. 5245-5253 ◽  
Author(s):  
Yihan Zhao ◽  
Yu Wang ◽  
Su Liu ◽  
Chonglin Wang ◽  
Jiaxu Liang ◽  
...  
Keyword(s):  
Fluorescence Detection ◽  
Triple Helix ◽  
High Efficiency ◽  
Molecular Switch ◽  
Ultrasensitive Detection ◽  
Fluorescent Biosensing

We have developed a rapid and high-efficiency fluorescent biosensing platform based on triple-helix molecular-switch (THMS)-actuated exponential rolling circular amplification (RCA) strategy for the ultrasensitive detection of miR-21.

Triple-Helix Molecular Switch Electrochemical Ratiometric Biosensor for Ultrasensitive Detection of Nucleic Acids

2017 ◽  
Vol 89 (17) ◽  
pp. 8830-8835 ◽  
Author(s):  
Erhu Xiong ◽  
Zhenzhen Li ◽  
Xiaohua Zhang ◽  
Jiawan Zhou ◽  
Xiaoxia Yan ◽  
...  
Keyword(s):  
Nucleic Acids ◽  
Triple Helix ◽  
Molecular Switch ◽  
Ultrasensitive Detection

A novel colorimetric triple-helix molecular switch aptasensor for ultrasensitive detection of tetracycline

2015 ◽  
Vol 70 ◽  
pp. 181-187 ◽  
Author(s):  
Mohammad Ramezani ◽  
Noor Mohammad Danesh ◽  
Parirokh Lavaee ◽  
Khalil Abnous ◽  
Seyed Mohammad Taghdisi
Keyword(s):  
Triple Helix ◽  
Molecular Switch ◽  
Ultrasensitive Detection

Programmable DNA triple-helix molecular switch in biosensing applications: from in homogenous solutions to in living cells

2017 ◽  
Vol 53 (16) ◽  
pp. 2507-2510 ◽  
Author(s):  
Pinting Tang ◽  
Jing Zheng ◽  
Jianru Tang ◽  
Dandan Ma ◽  
Weijian Xu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Messenger Rna ◽  
Triple Helix ◽  
Molecular Switch ◽  
Living Cells ◽  
Dna Triple Helix

We demonstrated a gold nanoparticles-integrated programmable triple-helix molecular switch to realize biosensing messenger RNA from in homogenous solutions to living cells.

ASSESSMENT OF HEAVY METAL CONCENTRATION IN COCONUT WATER

1970 ◽  
pp. 07-10
Author(s):  
MdDidarul Islam, Ashiqur Rahaman, Aboni Afrose
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Concentration ◽  
Coconut Water ◽  
Toxic Heavy Metals ◽  
High Concentration ◽  
Toxic Heavy Metal ◽  
Low Concentration ◽  
Wet Ashing ◽  
Aas Method

This study was based on determining concentration of essential and toxic heavy metal in coconut water available at a local Hazaribagh area in Dhaka, Bangladesh. All essential minerals, if present in the drinking water at high concentration or very low concentration, it has negative actions. In this study, fifteen samples and eight heavy metals were analyzed by Atomic Absorption Spectroscopy (AAS) method which was followed by wet ashing digestion method. The concentration obtained in mg/l were in the range of 0.3 to 1.5, 7.77 to 21.2, 0 to 0.71, 0 to 0.9, 0 to 0.2, 0.9 to 17.3, 0.1 to 0.9, 0 to 0.9 and 0 to 0.7 for Fe, Ni, Cu, Cd, Cr, Zn, Pb and Se respectively. From this data it was concluded that any toxic heavy metals like Cd, Cr, Pb and Ni exceed their toxicity level and some essential nutrients were in low concentration in those samples. 

Assessment of micro and macro nutrients in poultry feeds available in Dhaka city, Bangladesh.

2017 ◽  
Vol 1 ◽  
pp. 264
Author(s):  
Md Didarul Islam ◽  
Ashiqur Rahaman ◽  
Fahmida Jannat
Keyword(s):  
Heavy Metals ◽  
Adverse Effect ◽  
The Other ◽  
Nutrient Level ◽  
Dhaka City ◽  
Toxic Heavy Metals ◽  
High Concentration ◽  
Low Concentration ◽  
Feed Formulation ◽  
Macro Nutrients

This study was based on to determine the concentration of macro and micro nutrients as well as toxic and nontoxic heavy metals present in the chicken feed available in Dhaka city of Bangladesh. All macro nutrients, if present in the feed at high concentration have some adverse effect, at the same time if this nutrient present in the feed at low concentration this have some adverse effect too. So that this nutrient level should be maintained at a marginal level. On the other side toxic heavy metals if present in the feed at very low concentration those can contaminate the total environment of the ecosystem. In this study six brand samples (starter, grower, finisher and layer) which was collected from different renowned chicken feed formulation industry in Bangladesh. Those samples were prepared for analysis by wet ashing and then metals were determined by Atomic Absorption Spectroscopy. It was found that 27.7 to 68.4, 57.3 to 121.9, 0.21 to 4.1, 0.32 to 2.1, 0.11 to 1.58, 0.28 to 2.11 and 0.28 to 1.78 for zinc, iron, copper, mercury, cadmium, nickel and cobalt respectively. It was found that essential macro and micro nutrients were present in the feed in low concentration on the other side mercury was present in high concentration in the feed samples.

Determination of Traces Heavy Metals from Solid Residues Formed by Combustion of Lignite in Relation to Degree of Accessibility in Soil and Plants

2017 ◽  
Vol 68 (10) ◽  
pp. 2363-2366
Author(s):  
Delia Nica Badea
Keyword(s):  
Heavy Metals ◽  
Power Plant ◽  
Thermal Power ◽  
Reference Value ◽  
Combustion Products ◽  
Toxic Heavy Metals ◽  
Area Of Influence ◽  
Risk Potential

The paper evaluates the presence and content of traces of heavy metals Hg, Pb, Ni, Cd (total forms) from coal and solid combustion products, the degree of transfer and accessibility in the area of influence of a lignite power plant. The content of toxic heavy metals in residues are characterized by RE Meiji [ 1 (Pb and Hg) and REMeij �1 (Ni and Cd) for the filter ash. Pb and Ni content in the soil exceeds normal values, and Pb exceeds and alert value for sensitive soils around the residue deposit (70.20 mg.Kg-1). The degree of accessibility of the metals in plants (TF), reported at the Khan reference value (0.5), indicates a significant bioaccumulation level for the metals: Cd (1.9) and Hg (0.6) inside the deposit; Cd (0.39) at the base of the deposit, Hg (0.8) in the area of the thermal power plant. The trace levels of heavy metals analyzed by GFAAS and CVAAS (Hg), indicates a moderate risk potential for food safety and quality of life in the studied area.

Metal-induced oxidative stress level in patients with fibromyalgia syndrome and its contribution to the severity of the disease: A correlational study

2020 ◽  
pp. 1-8
Author(s):  
Varsha Shukla ◽  
Siddharth Kumar Das ◽  
Abbas Ali Mahdi ◽  
Shweta Agarwal ◽  
Ragini Alok ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Heavy Metals ◽  
Fibromyalgia Syndrome ◽  
Positive Association ◽  
Protein Carbonyl ◽  
Essential Metals ◽  
Toxic Heavy Metals ◽  
Essential Trace Elements ◽  
Rheumatological Disease ◽  
Severity Of The Disease

BACKGROUND: Fibromyalgia syndrome (FMS) is an extra-articular rheumatological disease characterised by widespread chronic musculoskeletal pain. Metal-induced oxidative stress contributes to the severity of FMS. AIMS: First, this study evaluated the association between plasma levels of toxic heavy metals and essential metals with oxidative stress (OS) markers. Second, the OS markers and metal contents were correlated with the disease severity by assessing the Fibromyalgia Impact Questioner Revised (FIQR) and tender points (TP). METHOD: A total of 105 FMS patients and 105 healthy controls of similar age and sex were recruited. OS parameter such as lipid peroxidation (LPO), protein carbonyl group (PCG), nitric oxide (NO) and essential metals such as zinc (Zn), magnesium (Mg), manganese (Mn), copper (Cu) and toxic heavy metals such as aluminium (Al), arsenic (As), lead (Pb) were estimated. RESULTS: Levels of LPO, PCG, NO (p< 0.001) and Cu, Mn, and Al (p< 0.001), were significantly higher, and Mg (p< 0.001) and Zn (p< 0.001) were significantly lower in patients compared to controls. A positive association was observed between OS parameters, FIQR and TP with Cu, Al and Mn. A significant negative association was observed between Zn and Mg with FIQR, TP and OS parameters. CONCLUSION: Heavy metals such as Al induce OS parameters and decrease the levels of essential trace elements such as Mg and Zn, which may be responsible for the severity of FMS.

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