scholarly journals Tuning the order of colloidal monolayers: assembly of heterogeneously charged colloids close to a patterned substrate

Soft Matter ◽  
2018 ◽  
Vol 14 (40) ◽  
pp. 8119-8136 ◽  
Author(s):  
Emanuele Locatelli ◽  
Emanuela Bianchi
Keyword(s):  
Patterned Substrate ◽  
Patterned Surface ◽  
Polar Caps ◽  
Charged Colloids ◽  
Positively Charged

We study the behavior of negatively charged colloids with two positively charged polar caps close to a planar patterned surface.

Synthetic imogolite: properties, synthesis and possible applications

Clay Minerals ◽  
1983 ◽  
Vol 18 (4) ◽  
pp. 459-472 ◽  
Author(s):  
V. C. Farmer ◽  
M. J. Adams ◽  
A. R. Fraser ◽  
F. Palmieri
Keyword(s):  
Mechanical Stability ◽  
Surface Acidity ◽  
Outer Diameter ◽  
Charged Colloids ◽  
Inner Surface ◽  
Forming Characteristics ◽  
Inner Diameter ◽  
Anionic Detergents ◽  
Positively Charged ◽  
Long Chain

AbstractThe unique properties of imogolite are closely related to its structure, which is a tube of 23–27 Å outer diameter and ∼10 Å inner diameter, with an AIOH outer surface and SiOH inner surface. Acid dispersions contain the long, positively-charged tubes as isolated units or small bundles, which form bulky gels in alkali, and flocculate with negatively-charged colloids, polyvalent anions, and long-chain anionic detergents. Sorption properties are associated with the 10 Å intra-tube pores and with inter-tube channels of variable dimensions. Surface acidity is less than that of layer-silicate clays. The chemical and mechanical stability, biological activity, film- and fibre-forming characteristics, and conditions of synthesis are reviewed, on the basis of both new and published findings. Areas of potential application are indicated.

Formation and Properties of Positively Charged Colloids Based on Polyelectrolyte Complexes of Biopolymers

Langmuir ◽  
2004 ◽  
Vol 20 (18) ◽  
pp. 7766-7778 ◽  
Author(s):  
Christophe Schatz ◽  
Jean-Michel Lucas ◽  
Christophe Viton ◽  
Alain Domard ◽  
Christian Pichot ◽  
...  
Keyword(s):  
Polyelectrolyte Complexes ◽  
Charged Colloids ◽  
Positively Charged

Microscopics of Complexation between Long DNA Molecules and Positively Charged Colloids

2002 ◽  
Vol 89 (8) ◽  
Author(s):  
K. Keren ◽  
Y. Soen ◽  
G. Ben Yoseph ◽  
R. Gilad ◽  
E. Braun ◽  
...  
Keyword(s):  
Dna Molecules ◽  
Charged Colloids ◽  
Positively Charged

SILICON THERMAL WATERS AND THEIR IMPACT ON HUMAN HEALTH

2021 ◽  
pp. 96-102
Author(s):  
Tkachenko A.V. ◽  
Slinkova T.A. ◽  
Shipkova L.N. ◽  
Kharlashkina P.S.
Keyword(s):  
Heavy Metals ◽  
Human Health ◽  
Silicic Acid ◽  
Thermal Water ◽  
Thermal Waters ◽  
Silicate Content ◽  
Charged Colloids ◽  
Medical Indications ◽  
Low Solubility ◽  
Positively Charged

The unique mineral thermal water has been researched. The composition of thermal water has been studied, its effect on human health has been described. This thermal water belongs to the hydrocarbonate-silicon type. The total silicate content is more than 120 mg/l, which is one of the highest rates for thermal springs in our country. The low solubility of silicic acid is compensated by the ability of silicon to form positively charged colloids, which neutralize microorganisms and promote the precipitation of heavy metals. Perhaps this factor is responsible for the insignificant presence of heavy metals in water. The medical indications and contraindications for this type of balneological treatment are described.

Protamine-DNA interaction

1978 ◽  
Vol 36 (2) ◽  
pp. 200-201
Author(s):  
D.P. Bazett-Jones ◽  
F.P. Ottensmeyer
Keyword(s):  
Small Volume ◽  
Double Helix ◽  
Dna Interaction ◽  
Dark Field ◽  
Sperm Head ◽  
Nuclear Proteins ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Dna Double Helix ◽  
Positively Charged

Dark field electron microscopy has been used for the study of the structure of individual macromolecules with a resolution to at least the 5Å level. The use of this technique has been extended to the investigation of structure of interacting molecules, particularly the interaction between DNA and fish protamine, a class of basic nuclear proteins of molecular weight 4,000 daltons.Protamine, which is synthesized during spermatogenesis, binds to chromatin, displaces the somatic histones and wraps up the DNA to fit into the small volume of the sperm head. It has been proposed that protamine, existing as an extended polypeptide, winds around the minor groove of the DNA double helix, with protamine's positively-charged arginines lining up with the negatively-charged phosphates of DNA. However, viewing protamine as an extended protein is inconsistent with the results obtained in our laboratory.

Structure and Interaction of Protamine by Dark Field Electron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 160-161
Author(s):  
D.P. Bazett-Jones ◽  
F.P. Ottensmeyer
Keyword(s):  
Electron Microscopy ◽  
Dark Field ◽  
Amino Acid Sequences ◽  
Dimensional Structure ◽  
3 Dimensional ◽  
Field Electron ◽  
Proposed Model ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Positively Charged

It has been shown for some time that it is possible to obtain images of small unstained proteins, with a resolution of approximately 5Å using dark field electron microscopy (1,2). Applying this technique, we have observed a uniformity in size and shape of the 2-dimensional images of pure specimens of fish protamines (salmon, herring (clupeine, Y-l) and rainbow trout (Salmo irideus)). On the basis of these images, a model for the 3-dimensional structure of the fish protamines has been proposed (2).The known amino acid sequences of fish protamines show stretches of positively charged arginines, separated by regions of neutral amino acids (3). The proposed model for protamine structure (2) consists of an irregular, right-handed helix with the segments of adjacent arginines forming the loops of the coil.

Enhanced type I photoreaction of indocyanine green via electrostatic-force-driven aggregation

Nanoscale ◽  
2020 ◽  
Vol 12 (17) ◽  
pp. 9517-9523 ◽  
Author(s):  
Huizhen Fan ◽  
Yu Fan ◽  
Wenna Du ◽  
Rui Cai ◽  
Xinshuang Gao ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Indocyanine Green ◽  
Electrostatic Force ◽  
Type I ◽  
Positively Charged

ICG forms aggregates in positively charged mesoporous silica, which show an enhanced type I photoreaction pathway.

Influence of nascent polypeptide positive charges on translation dynamics

2020 ◽  
Vol 477 (15) ◽  
pp. 2921-2934
Author(s):  
Rodrigo D. Requião ◽  
Géssica C. Barros ◽  
Tatiana Domitrovic ◽  
Fernando L. Palhano
Keyword(s):  
Mrna Decay ◽  
Translation Termination ◽  
Published Data ◽  
Translation Efficiency ◽  
Amino Acid Residues ◽  
High Concentration ◽  
Strong Argument ◽  
Translation Arrest ◽  
Exit Tunnel ◽  
Positively Charged

Protein segments with a high concentration of positively charged amino acid residues are often used in reporter constructs designed to activate ribosomal mRNA/protein decay pathways, such as those involving nonstop mRNA decay (NSD), no-go mRNA decay (NGD) and the ribosome quality control (RQC) complex. It has been proposed that the electrostatic interaction of the positively charged nascent peptide with the negatively charged ribosomal exit tunnel leads to translation arrest. When stalled long enough, the translation process is terminated with the degradation of the transcript and an incomplete protein. Although early experiments made a strong argument for this mechanism, other features associated with positively charged reporters, such as codon bias and mRNA and protein structure, have emerged as potent inducers of ribosome stalling. We carefully reviewed the published data on the protein and mRNA expression of artificial constructs with diverse compositions as assessed in different organisms. We concluded that, although polybasic sequences generally lead to lower translation efficiency, it appears that an aggravating factor, such as a nonoptimal codon composition, is necessary to cause translation termination events.

Sedimentation of charged colloids in the gravitational field : Relaxation toward equilibrium

2000 ◽  
Vol 10 (PR5) ◽  
pp. Pr5-109-Pr5-112
Author(s):  
J.-F. Dufrêche ◽  
J.-P. Simonin ◽  
P. Turq
Keyword(s):  
Gravitational Field ◽  
Charged Colloids
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