Comparison on Regulation of Calcium Phosphate by Organic Monolayer, Unilamellar Phospholipid Vesicles and Hydrothermal Self-Assembly

1999 ◽  
Vol 599 ◽  
Author(s):  
F. Z. Cui ◽  
Y. Zhang ◽  
Q. Cai
Keyword(s):  
Calcium Phosphate ◽  
Thin Layer ◽  
Self Assembly ◽  
Sol Gel ◽  
Lipid Vesicles ◽  
Phospholipid Vesicles ◽  
Monolayer Films ◽  
Organic Monolayer ◽  
Self Organized ◽  
Nucleation Growth

AbstractBiomineralization centers on the idea that organics control the nucleation, growth and final form of inorganics. The present studies investigated the deposition or precipitation of inorganics templated by organic monolayer films, unilamellar phospholipid vesicles, and selfassembled hexadecylamine, with the emphasis on the regulation of template on phase, orientation and microstructure of minerals. The obtained calcium phosphate varied from the thin layer precipitated on the organic monolayer to the confined particles formed inside the lipid vesicles to the mesolamellar structure self-organized in the precursor sol-gel. The typically regulated features of these three systems have been revealed. Consequently, the different phases of calcium phosphate can be obtained through variation of controllable parameters.

scholarly journals DIP-COATING SENYAWA KALSIUM FOSFAT DARI BATU KAPUR BUKIT TUI MELALUI METODE SOL-GEL

2015 ◽  
Vol 5 (1) ◽  
pp. 46
Author(s):  
Novesar Jamarun ◽  
Lia Anggresani ◽  
Syukri Arief
Keyword(s):  
Calcium Phosphate ◽  
Thin Layer ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Sol Gel Process ◽  
Xrd Patterns ◽  
Diammonium Hydrogen

 ABSTRACT Preparation of Dip-Coating Calcium Phosphate via sol-gel method using natural limestone Bukit Tui as calcium precursors and diammonium hydrogen phosphate as phosphorus precursors with sol-gel process has been investigated. Ethanol was used as solvent and DEA (diethanolamine) was used stabilizing agent. The powder were prepared by calcinated the sol at 950 oC. The products were characterized by Fourier Transform Infra Red, X-Ray Diffraction and Scanning Electron Microscopy. FTIR results showed that the vibration form was PO43-, P2O74-, O-H and CO2. XRD patterns of powder with various Ca/P mol ratio showed that the product of calcium phosphate was Ca2P2O7 and also found the hydroxyapatite Ca10(PO4)6(OH)2 in Ca/P mol ratio 1,7. SEM images of powder calcium phosphate revealed that their morphology were spheric and homogen. The coating process was done at glass substrate with coating speed 20 cm/min by calcinations at 400 oC. XRD patterns of thin layer showed that the product was Ca2P2O7 and SEM images of thin layer revealed that their morphology were bulk. Keywords: Natural limestone, calcium phosphate, hydroxyapatite, sol-gel, dip-coating

Clathrin-Inspired Coating and Stabilization of Liposomes by DNA Self-Assembly

2019 ◽  
Author(s):  
Kevin N. Baumann ◽  
Luca Piantanida ◽  
Javier García-Nafría ◽  
Diana Sobota ◽  
Kislon Voïtchovsky ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mechanical Stability ◽  
Lipid Vesicles ◽  
The Self ◽  
Force Microscopy ◽  
Atomic Force ◽  
Cryo Electron Microscopy ◽  
Further Development ◽  
Liposome Surface ◽  
Dna Coating

The self-assembly of the protein clathrin on biological membranes facilitates essential processes of endocytosis in biological systems and has provided a source of inspiration for materials design by the highly ordered structural appearance. By mimicking the architecture of clathrin self-assemblies to coat liposomes with biomaterials, new classes of hybrid carriers can be derived. Here we present a method for fabricating DNA-coated liposomes by hydrophobically anchoring and subsequently growing a DNA network on the liposome surface which structurally mimics clathrin assemblies. Dynamic light scattering (DLS), ζ-potential and cryo-electron microscopy (cryo-EM) measurements independently demonstrate successful DNA coating. Nanomechanical measurements conducted with atomic force microscopy (AFM) show that the DNA coating enhances the mechanical stability of the liposomes relative to uncoated ones. Furthermore, we provide the possibility to reverse the coating process by triggering the disassembly of the DNA coating through a toehold-mediated displacement reaction. Our results describe a straightforward, versatile, and reversible approach for coating and stabilizing lipid vesicles by an interlaced DNA network. This method has potential for further development towards the ordered arrangement of tailored functionalities on the surfaces of liposomes and for applications as hybrid nanocarrier.

scholarly journals Tripeptide Self-Assembly into Bioactive Hydrogels: Effects of Terminus Modification on Biocatalysis

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 173
Author(s):  
Marina Kurbasic ◽  
Ana M. Garcia ◽  
Simone Viada ◽  
Silvia Marchesan
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Chemical Modifications ◽  
Ability To Work ◽  
Active Compounds ◽  
Future Design ◽  
Self Organized ◽  
The Future ◽  
Bio Material ◽  
Supramolecular Catalysts

Bioactive hydrogels based on the self-assembly of tripeptides have attracted great interest in recent years. In particular, the search is active for sequences that are able to mimic enzymes when they are self-organized in a nanostructured hydrogel, so as to provide a smart catalytic (bio)material whose activity can be switched on/off with assembly/disassembly. Within the diverse enzymes that have been targeted for mimicry, hydrolases find wide application in biomaterials, ranging from their use to convert prodrugs into active compounds to their ability to work in reverse and catalyze a plethora of reactions. We recently reported the minimalistic l-His–d-Phe–d-Phe for its ability to self-organize into thermoreversible and biocatalytic hydrogels for esterase mimicry. In this work, we analyze the effects of terminus modifications that mimic the inclusion of the tripeptide in a longer sequence. Therefore, three analogues, i.e., N-acetylated, C-amidated, or both, were synthesized, purified, characterized by several techniques, and probed for self-assembly, hydrogelation, and esterase-like biocatalysis. This work provides useful insights into how chemical modifications at the termini affect self-assembly into biocatalytic hydrogels, and these data may become useful for the future design of supramolecular catalysts for enhanced performance.

scholarly journals Self-replication of a quantum artificial organism driven by single-photon pulses

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Valente
Keyword(s):  
Self Assembly ◽  
Artificial Life ◽  
Single Photon ◽  
Self Organization ◽  
Physical Systems ◽  
Self Organized ◽  
Living Organisms ◽  
A Chain ◽  
Thermodynamic Mechanism ◽  
Self Replication

AbstractImitating the transition from inanimate to living matter is a longstanding challenge. Artificial life has achieved computer programs that self-replicate, mutate, compete and evolve, but lacks self-organized hardwares akin to the self-assembly of the first living cells. Nonequilibrium thermodynamics has achieved lifelike self-organization in diverse physical systems, but has not yet met the open-ended evolution of living organisms. Here, I look for the emergence of an artificial-life code in a nonequilibrium physical system undergoing self-organization. I devise a toy model where the onset of self-replication of a quantum artificial organism (a chain of lambda systems) is owing to single-photon pulses added to a zero-temperature environment. I find that spontaneous mutations during self-replication are unavoidable in this model, due to rare but finite absorption of off-resonant photons. I also show that the replication probability is proportional to the absorbed work from the photon, thereby fulfilling a dissipative adaptation (a thermodynamic mechanism underlying lifelike self-organization). These results hint at self-replication as the scenario where dissipative adaptation (pointing towards convergence) coexists with open-ended evolution (pointing towards divergence).

Coarse-grained simulation of the self-assembly of lipid vesicles concomitantly with novel block copolymers with multiple tails

Soft Matter ◽  
2021 ◽  
Author(s):  
Alexander Kantardjiev
Keyword(s):  
Molecular Dynamics ◽  
Block Copolymers ◽  
Self Assembly ◽  
Lipid Vesicles ◽  
The Self ◽  
Coarse Grained ◽  
Copolymer Concentration ◽  
Copolymer Structure ◽  
Coarse Grained Molecular Dynamics

We carried out a series of coarse-grained molecular dynamics liposome-copolymer simulations with varying extent of copolymer concentration in an attempt to understand the effect of copolymer structure and concentration on vesicle self-assembly and stability.

Sol–gel synthesis of 2-dimensional TiO2: self-assembly of Ti–oxoalkoxy–acetate complexes by carboxylate ligand directed condensation

2021 ◽  
Author(s):  
Ruohong Sui ◽  
Connor E. Deering ◽  
Rohen Prinsloo ◽  
Christopher B. Lavery ◽  
Nancy Chou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Carboxylate Ligand ◽  
Sol Gel Synthesis ◽  
First Time

2-Dimensional TiO2 is synthesized for the first time by a sol–gel self-assembly of Ti–oxoalkoxy–acetate complexes.

Sintering parameters study of a biphasic calcium phosphate bioceramic synthesized by alcoholic sol-gel technique

2021 ◽  
Author(s):  
Omayra Beatriz Ferreiro Balbuena ◽  
Lilian Fernanda Santos Paiva ◽  
Alexandre Antunes Ribeiro ◽  
Magna Maria Monteiro ◽  
Marize Varella de Oliveira ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Biphasic Calcium Phosphate ◽  
Sol Gel ◽  
Gel Technique

Self-Assembly of Amphiphilic Poly(paraphenylene)s:  Thermotropic Phases, Solution Behavior, and Monolayer Films†

Langmuir ◽  
2003 ◽  
Vol 19 (16) ◽  
pp. 6537-6544 ◽  
Author(s):  
Tobias Fütterer ◽  
Thomas Hellweg ◽  
Gerhard H. Findenegg ◽  
Jörg Frahn ◽  
A. Dieter Schlüter ◽  
...  
Keyword(s):  
Self Assembly ◽  
Monolayer Films ◽  
Solution Behavior

Sol-gel synthesis of a ceramic based on calcium phosphate

2010 ◽  
Vol 83 (12) ◽  
pp. 2094-2099 ◽  
Author(s):  
N. N. Khimich ◽  
N. D. Eller ◽  
E. N. Khimich ◽  
D. M. Danilovich ◽  
E. V. Golikova
Keyword(s):  
Calcium Phosphate ◽  
Sol Gel ◽  
Sol Gel Synthesis

Self-organized micro-holes on titania based sol-gel films under continuous direct writing with a continuous wave ultraviolet laser

2013 ◽  
Vol 102 (21) ◽  
pp. 211903
Author(s):  
S. Bakhti ◽  
N. Destouches ◽  
L. Balan ◽  
E. Gamet ◽  
S. Reynaud
Keyword(s):  
Continuous Wave ◽  
Sol Gel ◽  
Direct Writing ◽  
Ultraviolet Laser ◽  
Self Organized ◽  
Micro Holes ◽  
Sol Gel Films
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