scholarly journals The role of pH, metal ions and their hydroxides in charge reversal of protein-coated nanoparticles

2019 ◽  
Vol 21 (21) ◽  
pp. 11011-11018 ◽  
Author(s):  
Jonas Schubert ◽  
Carmen Radeke ◽  
Andreas Fery ◽  
Munish Chanana
Keyword(s):  
Metal Ions ◽  
Au Nanoparticles ◽  
Charge Inversion ◽  
Charge Reversal ◽  
Metal Hydroxides ◽  
Coated Nanoparticles

In this study, we investigated charge inversion of protein-coated Au nanoparticles caused by the addition of metal ions. Adsorbed metal hydroxides were identified to cause the charge inversion of the NPs by using a combination of cryo-TEM, EFTEM andζ-potential measurements.

Adaptive Role of Lipids in Algae under Metal Ions Impact (a Review)

2018 ◽  
Vol 54 (6) ◽  
pp. 78-93
Author(s):  
V. V. Grubinko ◽  
O. I. Bodnar ◽  
A. I. Lutsiv ◽  
G. B. Viniarska
Keyword(s):  
Metal Ions ◽  
Adaptive Role

scholarly journals The Role of the Disulfide Bridge in the Copper (II) Binding by the Cyclic His4-Peptide

2021 ◽  
Vol 22 (12) ◽  
pp. 6458
Author(s):  
Aleksandra Pieniężna ◽  
Weronika Witak ◽  
Aneta Szymańska ◽  
Justyna Brasuń
Keyword(s):  
Metal Ions ◽  
Coordination Mode ◽  
Transition Metal Ions ◽  
Disulfide Bridge ◽  
Chain Flexibility ◽  
Vis Spectroscopy ◽  
Ph Range ◽  
Cd Studies ◽  
Metal Ratios

In this paper, we present studies on the influence of the disulfide bridge on the copper (II) ions’ binding abilities by the cyclic His4-peptide. The studied ligand HKHPHRHC-S-S-C consists of nine amino acids. The cyclic structure was obtained through a disulfide bridge between two cysteinyl groups. Moreover, this peptide is characterized by the presence of four His residues in the sequence, which makes it an interesting ligand for transition metal ions. The potentiometric and spectroscopic (UV-Vis spectroscopy and circular dichroism spectroscopy (CD)) studies were carried out in various molar ligand to metal ratios: 2:1, 1:1, and 1:2, in the pH range of 2.5–11 at 25 °C. The results showed that the cyclic His4-peptide promotes dinuclear complexes in each of these systems and forms the final dinuclear species with the {NIm, 3N-amide}{NIm, 3N-amide} coordination mode. The obtained data shows that cyclization by the formation of the disulfide bond has an impact on the peptide chain flexibility and appearance of additional potential donors for metal ions and influences the copper (II) ions’ coordination.

The Role of Transition Metal Ions in Ascorbate-Induced Cytotoxicity in Pancreatic Cancer

2014 ◽  
Vol 76 ◽  
pp. S124
Author(s):  
Juan Du ◽  
Brett A Wagner ◽  
Garry R Buettner ◽  
Joseph J Cullen
Keyword(s):  
Pancreatic Cancer ◽  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions

Reduced atomic shadowing in HiPIMS: Role of the thermalized metal ions

2018 ◽  
Vol 433 ◽  
pp. 934-944 ◽  
Author(s):  
João Carlos Oliveira ◽  
Fábio Ferreira ◽  
André Anders ◽  
Albano Cavaleiro
Keyword(s):  
Metal Ions

Role of Metal Ions In The Cleavage Mechanism by The E. Coli Rnase P Holoenzyme

1997 ◽  
Vol 16 (5-6) ◽  
pp. 721-725 ◽  
Author(s):  
Jens M. Warneckes ◽  
Christopher J. Green ◽  
Roland K. Hartmann
Keyword(s):  
Metal Ions ◽  
Rnase P ◽  
E Coli
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