Metabolism of Algae under the Impact of Metal Ions of the Aquatic Medium (a Review)

A model study on the influence of some heavy metal ions on the stability and vulcanization efficiency of uncompounded and compounded high-ammonia natural rubber (HANR) latex was carried out by an exogenous addition and then determined by Brookfield viscometer, mechanical stability time (MST) tester, and tensile testing machine. The case of pre-vulcanized HANR latex with different aging times was determined by the change in the volatile fatty acid (VFA) number, MST, and viscosity. The compounded HANR latex was coagulated by adding Mn2+and Mg2+ while it was unaltered by adding Zn2+, Fe2+, and Cu2+ ions, leading to their colloidal stability. Therefore, these metal ions were chosen further to study the pre-vulcanization of compounded HANR latex. The presence of Zn2+, Fe2+, and Cu2+ in the latex is responsible for the delay in the vulcanization process and changes the appearance of compounded latex. Before compounding, the addition of such metal ions led to the reduction in tensile strength of the obtained gloves. At the same time, there was no effect on the tensile properties of the gloves made from the compounded HANR latex containing the metal ions.

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The impact of metal ions on photoinduced electron-transfer properties: four photochromic metal–organic frameworks based on a naphthalenediimide chromophore

CrystEngComm ◽

10.1039/c8ce00213d ◽

2018 ◽

Vol 20 (17) ◽

pp. 2430-2439 ◽

Cited By ~ 17

Author(s):

Hui-Ling Xu ◽

Xiao-Shan Zeng ◽

Jie Li ◽

Yu-Ci Xu ◽

Hai-Jiang Qiu ◽

...

Keyword(s):

Electron Transfer ◽

Metal Ions ◽

Significant Role ◽

Photoinduced Electron Transfer ◽

Metal Organic Frameworks ◽

Metal Organic ◽

Electron Transfer Properties ◽

The Impact ◽

Transfer Properties

Four photochromic MOFs show that electron-withdrawing capabilities of metal ions play a significant role in tuning the photosensitivity of photochromic MOFs.

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Effect of Transitional Metals (Mn and Ni) Substitution in LiCoPO4 Olivines

Molecules ◽

10.3390/molecules25030601 ◽

2020 ◽

Vol 25 (3) ◽

pp. 601

Author(s):

Oriele Palumbo ◽

Jessica Manzi ◽

Daniele Meggiolaro ◽

Francesco M. Vitucci ◽

Francesco Trequattrini ◽

...

Keyword(s):

Transition Metal ◽

Metal Ions ◽

Structural Changes ◽

Transition Metal Ions ◽

Xrd Analysis ◽

Partial Substitution ◽

Structural Alterations ◽

X Ray ◽

Transitional Metals ◽

The Impact

Transition metal substitution is a key strategy to optimize the functional properties of advanced crystalline materials used as positive electrodes in secondary lithium batteries (LIBs). Here we investigate the structural alterations in the olivine lattice of Mn and Ni substituted LiCoPO4 phase and the impact on performance in LIBs. X-ray diffraction (XRD) and extended X-ray absorption experiments have been carried out in order to highlight the structural alterations induced by partial substitution of cobalt by manganese and nickel. XRD analysis suggests that substitution induces an expansion of the lattices and an increase of the antisite disorder between lithium and transition metal ions in the structure. XAS data highlight negligible electronic disorder but a relevant modulation in the local coordination around the different metal ions. Moreover, galvanostatic tests showed poor reversibility of the redox reaction compared to the pure LCP sample, and this failure is discussed in detail in view of the observed remarkable structural changes.

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The Effects on Angiogenesis of Relevant Inorganic Chemotherapeutics

Current Topics in Medicinal Chemistry ◽

10.2174/1568026620666201126163436 ◽

2020 ◽

Vol 20 ◽

Author(s):

Tiziano Marzo ◽

Diego La Mendola

Keyword(s):

Metal Ions ◽

Anticancer Agents ◽

Review Article ◽

Pharmacological Effects ◽

Complex Interactions ◽

Pathological Conditions ◽

Copper Zinc ◽

Antiangiogenic Factors ◽

The Impact

: Angiogenesis is a key process allowing the formation of blood vessels. It is crucial for all the tissue and organs, ensuring their function and growth. Angiogenesis is finely controlled by several mechanisms involving complex interactions between pro- or antiangiogenic factors and an imbalance in this control chain may result in pathological conditions. Metals as copper, zinc and iron cover an essential role in regulating angiogenesis, thus therapies having physiological metals as target have been proposed. Also, some complexes of heavier metal ions (e.g Pt, Au, Ru) are currently used as established or experimental anticancer agents targeting genomic or non-genomic targets. These molecules may affect the angiogenic mechanisms determining different effects that have been only poorly and non-systematically investigated so far. Accordingly, in this review article we aim to recapitulate the impact on the angiogenic process of some reference anticancer drugs, and how it is connected to the overall pharmacological effects. Also, we highlight how the activity of these drugs can be related to the role of biological essential metal ions. Overall, this may allow a deeper description and understanding of the antineoplastic activity of both approved or experimental metal complexes, providing important insights for the synthesis of new inorganic drugs able to overcome resistance and recurrence phenomena.

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Evaluation of the impact of multivalent metal ions on the permeation behavior of Dolutegravir sodium

Drug Development and Industrial Pharmacy ◽

10.3109/03639045.2015.1115869 ◽

2015 ◽

Vol 42 (7) ◽

pp. 1118-1126 ◽

Cited By ~ 7

Author(s):

Julia Anita Grießinger ◽

Sabine Hauptstein ◽

Flavia Laffleur ◽

Kesinee Netsomboon ◽

Andreas Bernkop-Schnürch

Keyword(s):

Metal Ions ◽

The Impact ◽

Multivalent Metal

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The effect of magnesium ions on triphosphate hydrolysis

Pure and Applied Chemistry ◽

10.1515/pac-2016-1125 ◽

2017 ◽

Vol 89 (6) ◽

pp. 715-727 ◽

Cited By ~ 14

Author(s):

Alexandre Barrozo ◽

David Blaha-Nelson ◽

Nicholas H. Williams ◽

Shina C. L. Kamerlin

Keyword(s):

Transition State ◽

Metal Ions ◽

Density Functional ◽

Reaction Pathway ◽

Enzymatic Reaction ◽

Phosphate Ester ◽

Mechanistic Pathway ◽

Phosphate Hydrolysis ◽

The Impact

AbstractThe role of metal ions in catalyzing phosphate ester hydrolysis has been the subject of much debate, both in terms of whether they change the transition state structure or mechanistic pathway. Understanding the impact of metal ions on these biologically critical reactions is central to improving our understanding of the role of metal ions in the numerous enzymes that facilitate them. In the present study, we have performed density functional theory studies of the mechanisms of methyl triphosphate and acetyl phosphate hydrolysis in aqueous solution to explore the competition between solvent- and substrate-assisted pathways, and examined the impact of Mg2+ on the energetics and transition state geometries. In both cases, we observe a clear preference for a more dissociative solvent-assisted transition state, which is not significantly changed by coordination of Mg2+. The effect of Mg2+ on the transition state geometries for the two pathways is minimal. While our calculations cannot rule out a substrate-assisted pathway as a possible solution for biological phosphate hydrolysis, they demonstrate that a significantly higher energy barrier needs to be overcome in the enzymatic reaction for this to be an energetically viable reaction pathway.

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