scholarly journals Kinetic and energetic insights in the dissipative non-equilibrium operation of an autonomous light-powered supramolecular pump

2021 ◽  
Author(s):  
Stefano Corrà ◽  
Marina Tranfik Bakic ◽  
Jessica Groppi ◽  
Massimo Baroncini ◽  
Serena Silvi ◽  
...  
Keyword(s):  
Self Assembly ◽  
Physicochemical Characterization ◽  
Theoretical Models ◽  
External Source ◽  
Light Energy ◽  
Artificial System ◽  
Depth Study ◽  
First Time ◽  
Non Equilibrium

Natural and artificial autonomous molecular machines operate by constantly dissipating energy coming from an external source to maintain a non-equilibrium state. The in-depth study of these dissipative states is highly challenging as they exist only as long as energy is provided. Here we report on the detailed physicochemical characterization of the dissipative operation of a supramolecular pump transducing light energy into chemical energy by shifting the equilibrium of self-assembly reactions. The composition of the system under light irradiation was followed in real-time by 1H NMR and parameters such as the dissipation and the energy storage at the steady state were extracted for four different irradiation intensities. For the first time in an artificial system, we quantitatively probed the relationship between the light energy input and the deviation of the dissipative state from thermodynamic equilibrium. Our results also provide a testing ground for newly developed theoretical models.

Physicochemical characterization of diacyltetrol-based lipids consisting of both diacylglycerol and phospholipid headgroups

RSC Advances ◽  
2014 ◽  
Vol 4 (42) ◽  
pp. 21971-21978 ◽  
Author(s):  
Narsimha Mamidi ◽  
Sukhamoy Gorai ◽  
Bolledu Ravi ◽  
Debasis Manna
Keyword(s):  
Physicochemical Properties ◽  
Physicochemical Characterization ◽  
Anionic Lipid ◽  
Phospholipid Headgroups ◽  
First Time

Synthesis and physicochemical properties of a family of diacyltetrol-based hybrid lipids, containing both diacylglycerol and anionic lipid headgroups within the same moiety, have been reported for the first time.

Physicochemical characterization of the thermo-induced self-assembly of thermo-responsive PDMAEMA-b-PDEGMA copolymers

2015 ◽  
Vol 53 (7) ◽  
pp. 924-935 ◽  
Author(s):  
Michael Wagner ◽  
Christian Pietsch ◽  
Andreas Kerth ◽  
Anja Traeger ◽  
Ulrich S. Schubert
Keyword(s):  
Self Assembly ◽  
Physicochemical Characterization

scholarly journals Fabrication and characterization of structurally stable pH-responsive polymeric vesicles by polymerization-induced self-assembly

RSC Advances ◽  
2021 ◽  
Vol 11 (46) ◽  
pp. 29042-29051
Author(s):  
Fen Zhang ◽  
Yanling Niu ◽  
Yantao Li ◽  
Qian Yao ◽  
Xiaoqi Chen ◽  
...  
Keyword(s):  
Self Assembly ◽  
Dispersion Polymerization ◽  
Chain Transfer ◽  
Ph Responsive ◽  
Polymeric Vesicles ◽  
Reversible Addition ◽  
Fabrication And Characterization ◽  
First Time ◽  
Structurally Stable

Smart polymeric vesicles with both tertiary amine and epoxy functional groups were fabricated for the first time via a reversible addition–fragmentation chain transfer dispersion polymerization approach.

Physicochemical characterization of the layer-by-layer self-assembly of polyphenol oxidase and chitosan on glassy carbon electrode

2005 ◽  
Vol 50 (14) ◽  
pp. 2865-2877 ◽  
Author(s):  
L. Coche-Guérente ◽  
J. Desbrières ◽  
J. Fatisson ◽  
P. Labbé ◽  
M.C. Rodriguez ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Polyphenol Oxidase ◽  
Glassy Carbon ◽  
Self Assembly ◽  
Physicochemical Characterization ◽  
Carbon Electrode ◽  
Layer By Layer

Experimental Approach of Measuring Thermal Properties for Ecological Materials Based on Additives Cork or Wool and Illite

2016 ◽  
Vol 8 (2) ◽  
Author(s):  
Soumia Mounir ◽  
Abdelhamid Khabbazi ◽  
Youssef Maaloufa ◽  
Asmae Khaldoun ◽  
Yassine El Hamdouni
Keyword(s):  
Thermal Properties ◽  
Heat Flow ◽  
Experimental Studies ◽  
Physicochemical Characterization ◽  
Thermal Characterization ◽  
Theoretical Models ◽  
Hot Plate ◽  
Knowing That ◽  
State Regime

This work is a contribution to understand the thermal properties of Illite with ecological additives granular presented by cork or fiber by wool in order to use those composites in building construction, the composites are air dried. Knowing that the clay composites were studied before, a series of experimental studies confirmed by complete theoretical models were conducted using different methods such as the asymmetrical hot plate in transient, steady-state regime, and flash methods in order to determine the thermal properties of the composite clay with ecological additives. Also, an analysis of sensibility of thermal properties was studied. For this purpose, a thermal characterization using hot plate and flash methods confirmed by complete theoretical models was studied. Then an analysis of the physicochemical characterization of clay was done to determine its characteristics. Finally, a study of depth heat flow diffusion was conducted to see the effect of additives on penetrating exterior heat flow inside house.

Nanoscale characterization of nautilus shell structure: An example of natural self-assembly

2006 ◽  
Vol 21 (6) ◽  
pp. 1484-1489 ◽  
Author(s):  
R. Velázquez-Castillo ◽  
J. Reyes-Gasga ◽  
D.I. García-Gutierrez ◽  
M. Jose-Yacaman
Keyword(s):  
Self Assembly ◽  
Organic Matrix ◽  
Dark Field ◽  
Orthorhombic Unit Cell ◽  
Transmission Electron ◽  
Nanoscale Characterization ◽  
Annular Dark Field ◽  
First Time ◽  
Inorganic Components

Structural characterization at the nanometric scale of the Nautilus sp shell was carried out by high-resolution transmission electron microscopy and high-angle annular dark field to understand how the organic and inorganic components are related. The inorganic phase that built the shell is made of calcium carbonate (CaCO3), with the orthorhombic unit cell of the aragonite, in a texturized arrangement in such a way that the c-axis is always perpendicular to the shell surface. The organic material forms films through the plates. We observed for a very first time some aragonite nanocrystals embedded in the organic matrix. This observation supports the hypothesis that the proteins and other organic compounds guide the crystal growth because the organic matrixes are the places where the nanocrystals grow.

Synthesis and Physicochemical Characterization of Mg-Al-Flufenamate-Layered Double Hydroxide

2017 ◽  
Vol 887 ◽  
pp. 100-103
Author(s):  
Siti Halimah Sarijo ◽  
Monica Limau Jadam ◽  
Z. Jubri
Keyword(s):  
Organic Compound ◽  
Layered Double Hydroxide ◽  
Self Assembly ◽  
Physicochemical Characterization ◽  
Flufenamic Acid ◽  
Basal Spacing ◽  
Hybrid Nanocomposite ◽  
Assembly Technique ◽  
Double Hydroxide

A nonsteroidal drug, flufenamic acid (FA) was successfully intercalated into magnesium-aluminium-layered double hydroxide, MAL for the formation of magnesium-aluminium-flufenamate-layered double hydroxide, MAF by self-assembly technique. As a result of the successful intercalation, basal spacing increased from 9.8 Å in the MAL to 23.5 Å in the MAF hybrid nanocomposite. The FTIR spectra of the MAF hybrid nanocomposite show resemblance peaks of the MAL and FA suggesting the inclusion of the organic compound into the MAL interlamellae. The percentage loading of FA was found to be 74.4 % (w/w) calculated from the percentage of carbon in the resulting material, MAF.

TBE in Sweden

2020 ◽  
Keyword(s):  
Genetic Characterization ◽  
Immunoglobulin M ◽  
Enzyme Linked Immunosorbent Assay ◽  
Second Phase ◽  
Serum Samples ◽  
Tick Borne Encephalitis ◽  
Specific Immunoglobulin ◽  
Tick Borne Encephalitis Virus ◽  
First Time

Tick-borne encephalitis virus (TBEV) was isolated for the first time in Sweden in 1958 (from ticks and from 1 tick-borne encephalitis [TBE] patient).1 In 2003, Haglund and colleagues reported the isolation and antigenic and genetic characterization of 14 TBEV strains from Swedish patients (samples collected 1991–1994).2 The first serum sample, from which TBEV was isolated, was obtained 2–10 days after onset of disease and found to be negative for anti-TBEV immunoglobulin M (IgM) by enzyme-linked immunosorbent assay (ELISA), whereas TBEV-specific IgM (and TBEV-specific immunoglobulin G/cerebrospinal fluid [IgG/CSF] activity) was demonstrated in later serum samples taken during the second phase of the disease.

Single Amino Acid Based Self-Assemblies of Cysteine and Methionine

2018 ◽  
Author(s):  
Nidhi Gour ◽  
Bharti Koshti ◽  
Chandra Kanth P. ◽  
Dhruvi Shah ◽  
Vivek Shinh Kshatriya ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Self Assembly ◽  
Aromatic Amino Acids ◽  
Neutral Condition ◽  
Single Amino Acid ◽  
Binding Assays ◽  
Human Neuroblastoma ◽  
Cytotoxicity Assays ◽  
First Time

We report for the very first time self-assembly of Cysteine and Methionine to discrenible strucutres under neutral condition. To get insights into the structure formation, thioflavin T and Congo red binding assays were done which revealed that aggregates may not have amyloid like characteristics. The nature of interactions which lead to such self-assemblies was purported by coincubating assemblies in urea and mercaptoethanol. Further interaction of aggregates with short amyloidogenic dipeptide diphenylalanine (FF) was assessed. While cysteine aggregates completely disrupted FF fibres, methionine albeit triggered fibrillation. The cytotoxicity assays of cysteine and methionine structures were performed on Human Neuroblastoma IMR-32 cells which suggested that aggregates are not cytotoxic in nature and thus, may not have amyloid like etiology. The results presented in the manuscript are striking, since to the best of our knowledge,this is the first report which demonstrates that even non-aromatic amino acids (cysteine and methionine) can undergo spontaneous self-assembly to form ordered aggregates.

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