نتایج جستجو برای: copper ions

تعداد نتایج: 213109  

Journal: :Journal of bacteriology 2013
Alexander Speer Jennifer L Rowland Mehri Haeili Michael Niederweis Frank Wolschendorf

Copper resistance mechanisms are crucial for many pathogenic bacteria, including Mycobacterium tuberculosis, during infection because the innate immune system utilizes copper ions to kill bacterial intruders. Despite several studies detailing responses of mycobacteria to copper, the pathways by which copper ions cross the mycobacterial cell envelope are unknown. Deletion of porin genes in Mycob...

Journal: :Journal of medical and dental sciences 2004
Sukontip Arwatchanakan Katsumi Uoshima Hidekazu Takahashi Hiroyuki Miura

PURPOSE Electrical potential may facilitate the moving of corroded metal ions across radicular dentin to cause allergic reaction. This study was to investigate the effect of electrical potentials on the penetration of silver and copper ions through radicular dentin. MATERIALS AND METHODS Eighty-eight dentin discs were prepared from intact premolar teeth and placed between two containers of th...

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 2002
Kolishka Tsekova Dessislava Todorova

The influence of copper (II) ions on the growth, accumulation properties and superoxide dismutase (SOD) activity of a growing culture of Aspergillus niger B-77 were studied. Microbial growth, the level of copper (II) accumulation and SOD activity depended on the initial copper (II) concentration. Aspergillus niger is able to accumulate large amounts of copper (II) from the nutrient medium with ...

Journal: :Iranian biomedical journal 2009
Mohammad Ali Ghaffari Samad Mojab

BACKGROUND It is well established that oxidative modification of low density lipoprotein (LDL) plays a causal role in human atherogenesis and the risk of atherosclerosis is increased in patients with diabetes mellitus. We examined the in vitro effect of glucose on native and glycated LDL oxidation using copper ion dependent oxidation system. METHODS In this study, LDL was isolated from plasma...

Journal: Journal of Nanoanalysis 2014

The present study has investigated the synthesis of copper nanoparticles via copper dismutation reaction in an aqueous solution and ambient conditions. Copper (II) chloride hydrate ( ), sodium oleate (SO), sodium chloride (NaCl) and ethylene diamine (EN) have been used as copper (I, II) ions source, surfactant, chloride ions supplier and ligand, respectively. Also, an amount of hydrochloric aci...

Journal: :The Journal of biological chemistry 2001
J Heredia M Crooks Z Zhu

Copper ions are essential at a proper level yet toxic when present in excess. To maintain a proper intracellular level, cells must be able to sense the changes in copper ion concentrations. The yeast transcription factor Mac1p plays a critical role in the transcriptional regulation of CTR1 and CTR3, both encoding high affinity copper ion transporters. Here we report that the Mac1p binding of th...

2017
Soghra Bagheri Rosanna Squitti Thomas Haertlé Mariacristina Siotto Ali A. Saboury

Alzheimer's disease (AD) is a neurodegenerative disorder that is characterized by amyloid plaques in patients' brain tissue. The plaques are mainly made of β-amyloid peptides and trace elements including Zn2+, Cu2+, and Fe2+. Some studies have shown that AD can be considered a type of metal dyshomeostasis. Among metal ions involved in plaques, numerous studies have focused on copper ions, which...

2017
Rilong Zhu Gangqiang Zhou Fengxia Tang Chunyi Tong Yeyao Wang Jinsheng Wang

Based on the strong interaction between histidine and copper ions and the signal enhancement effect of gold-labeling carbon nanotubes, an electrochemical sensor is established and used to measure copper ions in river water. In this study the results show that the concentrations of copper ion have well linear relationship with the peak current in the range of 10-11-10-7 mol/L, and the limit of d...

2010
M. Yilmaz T. Tay M. Kivanc

Enterococcus faecium, a lactic acid bacterium (LAB), was evaluated for its ability to remove copper(II) ions from water. The effects of the pH, contact time, initial concentration of copper(II) ions, and temperature on the biosorption rate and capacity were studied. The initial concentrations of copper(II) ions used to determine the maximum amount of biosorbed copper(II) ions onto lyophilised l...

Journal: :iranian chemical communication 2014
rasoul pourtaghavi talemi sajjad bakhtiari nabi javadi morteza vatanparast

in the present study, we investigate the potentiometric behavior of cu2+ carbon paste electrodes based on two mercapto compounds 2-ethylmino-5-mercapto-1,3,4-thiadiazole (eamt) and 2-acetylamino-5-mercapto-1,3,4-thiadiazole (aamt) self-assembled on gold nano-paricle (gnp) as ionophore. then, the results obtained from the modified electrodes are compared. the self-assembled ionophores exhibit a ...

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