Poliomyelitis virus: Current knowledge of physico-chemical structure

1959 ◽  
Vol 36 (9) ◽  
pp. 469
Author(s):  
Frederick L. Shaffer
Keyword(s):  
Chemical Structure ◽  
Current Knowledge ◽  
Poliomyelitis Virus ◽  
Physico Chemical

Study of Physico-chemical Characteristics and Pharmacological Effects of 1-Ethyl-Salicyldene-bis-Ethylene-Diamine and Its Complex with Mn(II)

2019 ◽  
Vol 70 (7) ◽  
pp. 2534-2537
Author(s):  
Gladiola Tantaru ◽  
Mihai Apostu ◽  
Antonia Poiata ◽  
Mihai Nichifor ◽  
Nela Bibire ◽  
...  
Keyword(s):  
Schiff Base ◽  
Chemical Structure ◽  
Antimicrobial Activities ◽  
Ethylene Diamine ◽  
Chemical Characteristics ◽  
Gram Negative Bacteria ◽  
Pharmacological Effects ◽  
Physico Chemical ◽  
Anti Inflammatory ◽  
Inflammatory Effect

The paper presents the synthesis of a new complex combination of a Bis-Schiff base with Mn(II) ions with great potential for antimicrobial and anti-inflammatory activity. A new complex of the Salen-type ligand, 1-ethyl-salicylidene-bis-ethylene diamine was synthetized using Mn(II) ions. The chemical structure was confirmed through 1H-NMR and IR spectroscopy. The antimicrobial activities of the Bis-Schiff base and its complex were tested in comparison with Ampicillin, Chloramphenicol, Tetracycline, Ofloxacin and Nystatin. Those compounds were found to be active against Gram-positive or Gram-negative bacteria, and had an anti-inflammatory effect comparable to that of Indomethacin.

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

The physico-chemical structure and activity of hydrodesulphurization catalysts aged by accelerated method

2015 ◽  
Vol 256 ◽  
pp. 261-268 ◽  
Author(s):  
M. Zbuzek ◽  
A. Vráblík ◽  
V. Tukač ◽  
M. Veselý ◽  
A. Prokešová ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Physico Chemical ◽  
Structure And Activity

scholarly journals Tracing the cold and warm physico-chemical structure of deeply embedded protostars: IRAS 16293−2422 vs. VLA 1623−2417

2018 ◽  
Vol 617 ◽  
pp. A120 ◽  
Author(s):  
N. M. Murillo ◽  
E. F. van Dishoeck ◽  
M. H. D. van der Wiel ◽  
J. K. Jørgensen ◽  
M. N. Drozdovskaya ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Cavity Wall ◽  
Key Factors ◽  
Chemical Complexity ◽  
Chemical Structures ◽  
Chemical Models ◽  
Physico Chemical ◽  
Envelope Material ◽  
Low Mass ◽  
Dust Distribution

Context. Much attention has been placed on the dust distribution in protostellar envelopes, but there are still many unanswered questions regarding the physico-chemical structure of the gas. Aims. Our aim is to start identifying the factors that determine the chemical structure of protostellar regions, by studying and comparing low-mass embedded systems in key molecular tracers. Methods. The cold and warm chemical structures of two embedded Class 0 systems, IRAS 16293−2422 and VLA 1623−2417 were characterized through interferometric observations. DCO+, N2H+, and N2D+ were used to trace the spatial distribution and physics of the cold regions of the envelope, while c-C3H2 and C2H from models of the chemistry are expected to trace the warm (UV-irradiated) regions. Results. The two sources show a number of striking similarities and differences. DCO+ consistently traces the cold material at the disk-envelope interface, where gas and dust temperatures are lowered due to disk shadowing. N2H+ and N2D+, also tracing cold gas, show low abundances toward VLA 1623−2417, but for IRAS 16293−2422, the distribution of N2D+ is consistent with the same chemical models that reproduce DCO+. The two systems show different spatial distributions c-C3H2 and C2H. For IRAS 16293−2422, c-C3H2 traces the outflow cavity wall, while C2H is found in the envelope material but not the outflow cavity wall. In contrast, toward VLA 1623−2417 both molecules trace the outflow cavity wall. Finally, hot core molecules are abundantly observed toward IRAS 16293−2422 but not toward VLA 1623−2417. Conclusions. We identify temperature as one of the key factors in determining the chemical structure of protostars as seen in gaseous molecules. More luminous protostars, such as IRAS 16293−2422, will have chemical complexity out to larger distances than colder protostars, such as VLA 1623−2417. Additionally, disks in the embedded phase have a crucial role in controlling both the gas and dust temperature of the envelope, and consequently the chemical structure.

scholarly journals PHYSICO-CHEMICAL CHARACTERISTICS AND SORPTION CAPACITY OF BIOSYNTHETIC POLYMERS ON THE BASIS OF FERULIC ACID AND CONIFERYL ALCOHOL RESPECT TO ZEARALENONE MYCOTOXIN

2018 ◽  
pp. 5-14
Author(s):  
Anatoliy Petrovich Karmanov ◽  
Al'bert Vladimirovich Kanarskiy ◽  
Zosya Albertovna Kanarskaya ◽  
Lyudmila Sergeyevna Kocheva ◽  
Ol'ga Yur'yevna Derkacheva ◽  
...  
Keyword(s):  
Ferulic Acid ◽  
Porous Structure ◽  
Chemical Structure ◽  
Coniferyl Alcohol ◽  
Element Composition ◽  
Identical Element ◽  
Quantitative Content ◽  
Physico Chemical ◽  
Physical Phenomena

The data about the chemical structure of the polymers, synthesized by the method of fermentative dehydropolymerization of ferulic acid, and also coniferyl alcohol, are presented. It is established that the polyferulic acids have practically identical element composition, but they differ, according to data of IR- and NMR-13C-spectroscopy, in the quantitative content of phenol and carboxyl groups. A study of their adsorptivity with respect to zearalenone mycotoxin is carried out, and the characteristics of specific surface area and capillary-porous structure are established. The calculations of the correlation relationships between the adsorptivity and the parameters of surface-porous structure and chemical structure of different models indicate to the key role of the mechanisms of chemical adsorption, whereas the contribution of physical phenomena is not essential. It is shown that the polymer, synthesized from the coniferyl alcohol, is characterized by the highest indices of adsorption.

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.

THE BENEFITS OF CURCUMIN IN VARIOUS DISEASES AND THE EXTENSION OF ITS APPLICATION THROUGH VARIOUS TECHNOLOGICAL APPROACHES

2018 ◽  
Vol 28 (2) ◽  
pp. 461-468
Author(s):  
Daniel Argilashki ◽  
Nina Koleva ◽  
Bozhidarka Hadzhieva
Keyword(s):  
Chemical Structure ◽  
Water Solubility ◽  
Curcuma Longa ◽  
Active Agent ◽  
Gastrointestinal Symptoms ◽  
Limiting Factor ◽  
Herbaceous Plant ◽  
Perennial Herbaceous Plant ◽  
Physico Chemical ◽  
The Family

Turmeric is a plant that is widely used as a spice, and is also imposed in Ayurveda and Chinese medicin as a healing remedy.Indian traditional medicine has successfully established the use of turmeric for wound healing, rheumatic disorders, gastrointestinal symptoms, deworming, rhinitis and as a cosmetic. Turmeric (Curcuma Longa L.) is a perennial, herbaceous plant belonging to the family of Ginger ( Zingiberaceae). The usable part is the rhizome, which is cylindrical, often branched, on the outside is brown, inside is intense yellow with bitter taste and strong aroma.In the review, we present contemporary studies exploring the nature of turmeric. Due to its polyphenolic chemical structure curcumin has an anti-inflammatory, cholecinetic and antioxidant effect. These characteristics determine the use of curcumin for various diseases - diabetes, arthritis, Alzheimer's, asthma and heart failure, psoriasis, dermatitis, cancers, ophthalmic diseases, uroinfections, acne, vitiligo, etc. A limiting factor for the widespread use of curcumin in medicine is its physico-chemical instability, extremely low water solubility, poor bioavailability, rapid metabolism, which make it difficult to use it as a therapeutic agent. That is why in the present review we also present various technological approaches, such as: complexation with cyclodextrin; the use of adjuvants such as piperine that prevents glucuronidation and the rapid elimination of curcumin; use of liposomal curcumin; use of curcumin structural analogs; application of curcumin in complexes with phospholipids; use of nanoparticles; inclusion in emulsions. These methods aim at increasing the solubility, optimizing the absorption and the bioavailability of curcumin, leading to the expansion of the turmeric application areas and offering additional opportunities for targeted therapy or prophylaxis of specific diseases.In order to prevent various diseases in the future, it is necessary to increase the use of curcumin as an active agent both in the diet and in the form of concentrated sources such as tablets, capsules and other dosage forms.

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