Chemical structure and physico-chemical properties of agar

Hydrobiologia ◽  
1991 ◽  
Vol 221 (1) ◽  
pp. 137-148 ◽  
Author(s):  
Marc Lahaye ◽  
Cyrille Rochas
Keyword(s):  
Chemical Structure ◽  
Chemical Properties ◽  
Physico Chemical

scholarly journals The Effect of Chitosan on the Chemical Structure, Morphology, and Selected Properties of Polyurethane/Chitosan Composites

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1205
Author(s):  
Agnieszka Piotrowska-Kirschling ◽  
Joanna Brzeska
Keyword(s):  
Chemical Structure ◽  
Materials Science ◽  
Chemical Properties ◽  
Materials Synthesis ◽  
Physico Chemical ◽  
Structure Morphology ◽  
Basic Parameters ◽  
Properties Of Materials ◽  
The Impact ◽  
Positive Effect

Materials science is an interdisciplinary area of studies. This science focuses on the influence of the physico-chemical properties of materials on their application in human everyday lives. The materials’ synthesis should be developed in accordance with sustainable development. Polyurethanes (PUR) represent a significant consumption of plastic in the world. Modification of PUR, e.g., with polysaccharide of natural origin (chitosan, Chit), should have a positive effect on their functional properties and degradability in the natural environment. The basic parameters affecting the scope and direction of changes are the size and quantity of the chitosan particles. The impact assessment of chitosan on the chemical structure, morphology, thermal properties, crystallinity, mechanical properties, flammability, water sorption, adsorption properties, degradability, and biological activity of PUR/Chit composites (without other additives) is discussed in this article. To the best of our knowledge, recent literature does not contain a study discussing the direct impact of the presence of chitosan in the structure of PUR/Chit composite on its properties, regardless of the intended uses. This paper provides an overview of publications, which presents the results of a study on the effect of adding chitosan in polyurethane/chitosan composites without other additives on the properties of polyurethane.

scholarly journals Interactions between Cocoa Husk Catechin and Casein Micelles and their Impact on Physico-chemical Properties

2021 ◽  
pp. 21-33
Author(s):  
Premy Puspitawati Rahayu ◽  
Abdul Manab ◽  
Manik Eirry Sawitri ◽  
Ria Dewi Andriani ◽  
Mulia Winirsya Apriliyani ◽  
...  
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Chemical Structure ◽  
Protein Profile ◽  
Chemical Properties ◽  
Electrophoretic Analysis ◽  
Animal Science ◽  
Physico Chemical ◽  
Infra Red ◽  
Microscopy Analysis

Aims: The purpose of this research was to investigate the influence of physicochemical properties of interaction casein with different concentration catechin sources of the cocoa husk. Study design: Casein was added catechin with various concentration treatments (0 (control), 20, 40 and 60 (μg/ml)). Place and Duration of Study: This study was conducted between April until August 2020 at the Faculty of Animal Science, Universitas Brawijaya. Methodology: Casein was added catechin with various concentration treatments (0, 20, 40 and 60 (μg/ml)). An analysis is carried out to determine interaction using UV-Vis detection, chemical structure using Fourier Transform Infra-Red, microscopy analysis by Scanning Electron Microscopy, particle size by Zetasizer Nano Series Software Version 7.01, Malvern Instrument and electrophoretic analysis. Results: The interaction between casein and catechin was investigated by the method of UV-Vis detection and chemical structure analysis by Fourier Transform Infra-Red showed that it was indicated that catechin could detected in casein. It is similar with recent research. The interaction of casein and catechin showed to decrease the particle size and showed on microscopy analysis. Protein profile showed to increase the molecular weight with the addition of catechin, it can be indicated that presence interaction both on casein with catechin. Conclusion: Casein interacted with catechins 60 µg/ml was able to increase casein stability, maintain nano size, casein components were still detected in the protein profile, the resulting microstructure looked compact and functional groups of bioactive compounds were still detected using Fourier Transform Infra-Red.

scholarly journals Topological Indices of mth Chain Silicate Graphs

Mathematics ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 42 ◽  
Author(s):  
Jia-Bao Liu ◽  
Muhammad Kashif Shafiq ◽  
Haidar Ali ◽  
Asim Naseem ◽  
Nayab Maryam ◽  
...  
Keyword(s):  
Biological Activity ◽  
Chemical Structure ◽  
Chemical Properties ◽  
Chemical Compounds ◽  
Topological Indices ◽  
Numerical Representation ◽  
Topological Descriptor ◽  
Physico Chemical ◽  
Chain Silicate ◽  
Atom Bond

A topological index is a numerical representation of a chemical structure, while a topological descriptor correlates certain physico-chemical characteristics of underlying chemical compounds besides its numerical representation. A large number of properties like physico-chemical properties, thermodynamic properties, chemical activity, and biological activity are determined by the chemical applications of graph theory. The biological activity of chemical compounds can be constructed by the help of topological indices such as atom-bond connectivity (ABC), Randić, and geometric arithmetic (GA). In this paper, Randić, atom bond connectivity (ABC), Zagreb, geometric arithmetic (GA), ABC4, and GA5 indices of the mth chain silicate S L ( m , n ) network are determined.

scholarly journals Effect of Dopamine, a Human Love Factor, on the Physio-Chemical Properties of Filamentous Green Alga: Spirogyra

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Aishwarya Khamari ◽  
Akshya K. Mishra ◽  
Samir K. Bhoi ◽  
Monika Khamari
Keyword(s):  
Ventral Tegmental Area ◽  
Green Alga ◽  
Chemical Structure ◽  
Chemical Properties ◽  
Filamentous Algae ◽  
Human Love ◽  
Physico Chemical ◽  
New Compounds ◽  
The Brain ◽  
Lower Group

Dopamine is a hormone & neurotransmitter, occurring in wide verities of animals, including both vertebrates and invertebrates. In chemical structure, it is a phenylethylamine. Dopamine is commonly associated with the pleasure system of the brain, providing the feelings of enjoyment and reinforcement to motivate a process to perform certain activities. It is released (particularly in area such as nucleus accbens and ventral tegmental area) by naturally rewarding experiences such as food sex etc. Since conjugating is such type of activity i.e. it is also manifested in lower group of filamentous algae, it was thought that how these groups of algae respond to dopamine. The effect of dopamine was studied on the physico-chemical properties of Spirogyra and it was observed that the changing the colour to yellow is accomplished by the formation of new compounds (??) needs further investigation.

scholarly journals New glutarimide antibiotics, S-632-B1 and B2. II. Isolation, physico-chemical properties and chemical structure.

1989 ◽  
Vol 42 (5) ◽  
pp. 654-661 ◽  
Author(s):  
TOSHIO OTANI ◽  
YOSHINORI MINAMI ◽  
HIROSHI MATSUMOTO ◽  
TERUYOSHI MARUNAKA ◽  
ZHI-XIAN Lou ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Chemical Properties ◽  
Physico Chemical

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

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