Transition-metal tetrahydroborate complexes as catalysts. 1. Nonempirical determination of static, dynamic, and chemical properties of the model compounds sodium tetrahydroborate and aluminum borate (AlH2BH4)

1981 ◽  
Vol 20 (6) ◽  
pp. 1687-1691 ◽  
Author(s):  
Vincenzo. Barone ◽  
Giuliano. Dolcetti ◽  
Francesco. Lelj ◽  
Nino. Russo
Keyword(s):  
Transition Metal ◽  
Sodium Tetrahydroborate ◽  
Chemical Properties ◽  
Aluminum Borate ◽  
Model Compounds ◽  
And Chemical Properties

THE IMPORTANCE OF THE RED BOOK OF SOILS FOR MONITORING AND JUSTIFICATION OF CONSERVATION MEASURES

2020 ◽  
Author(s):  
O.S. Bezuglova ◽  
Keyword(s):  
Chemical Properties ◽  
Natural State ◽  
Soil Maps ◽  
Rostov Region ◽  
Conservation Measures ◽  
Background Data ◽  
The Russian Federation ◽  
Physical And Chemical ◽  
And Chemical Properties

Rostov Region belongs to the highly protected natural territories characterized by the continuous plowing. There territories are the only reserves with the soils preserved in their natural state. However, these areas often lack detailed information about the soils quality and composition. Surveying soils on these territories is crucial for determination of their basic physical and chemical properties. The resulted compilation of soil maps could lay a foundation for creating the Red Book of Soils and the formation of a section in the soil-geographical database of the Russian Federation. Subsequently, such information can be used as a background data for the main types of soils in the region. It will be also valuable during monitoring and justification of conservation measures.

scholarly journals Structure Determination of C23H19N4OBr from Synchrotron Data

2014 ◽  
Vol 70 (a1) ◽  
pp. C141-C141
Author(s):  
Ozen Ozgen ◽  
Engin Kendi ◽  
Semra Koyunoglu ◽  
Akgul Yesilada ◽  
Hwo-Shuenn Sheu
Keyword(s):  
Powder Diffraction ◽  
Structural Information ◽  
Chemical Properties ◽  
Biological Properties ◽  
Cell Parameters ◽  
Fundamental Understanding ◽  
Physical And Chemical ◽  
Radiation Research ◽  
And Chemical Properties

A significant part of medicine is based on the discovery and development of drugs. It is very important to know the crystal structure of pharmaceutical compounds for fundamental understanding of structure, physical and chemical properties. Many of these materials are available only as powders. So any structural information must be obtained from powder diffraction. I am going to present following the stages while solving the structure of C23H19N4OBr, 2-[3-phenyl-4(m-bromophenyl)-2-pyrazolin-1-yl]-3-methyl-4(3H)-quinazolinone, from 2-pyrazolines derivatives. The compounds are known to display various biological properties such as fungicidal insecticidal, anti bacterial, anti viral activities, pharmacological properties such as antiinflammatory agents and have industral properties(1). The powder diffraction data was collected with Debye Scherrer camera at the BL01C2 beamline at room temperature in National Synchrotron Radiation Research Center(NSRRC), Taiwan. X-ray of wavelength was 1.0333Å. This compound crystallizes in orthorhombic system space group P bca, Z=8, unit cell parameters of a=25.83(1)Å, b=15.55(5)Å, c=10.63(3)Å, and V=4266.0(10)Å3. Reliability factors were reached Rwp=0.075, Rp=0.053, RB=0.086 ve S=1.31 after Rietveld refinement.

scholarly journals Analysis of physical, mechanical and chemical properties of seeds and kernels of Jatropha curcas  

2016 ◽  
Vol 61 (No. 3) ◽  
pp. 99-105 ◽  
Author(s):  
M. Müller ◽  
Š. Horníčková ◽  
P. Hrabě ◽  
J. Mařík
Keyword(s):  
Fatty Acids ◽  
Vitamin E ◽  
Jatropha Curcas ◽  
Unsaturated Fatty Acids ◽  
Chemical Properties ◽  
Acid Value ◽  
Chromatography Method ◽  
Value Determination ◽  
And Chemical Properties

The research was performed to examine the physical, mechanical and chemical properties of seeds and kernels of Jatropha curcas. The test parameters were the dimensions of the seeds and kernels, required energy for oil extraction, determination of fatty acids in the oil by gas chromatography method, determination of the iodine value, determination of the acid value, determination of total polyphenols by the Folin & Ciocault reagent and determination of tocopherols and tocotrienols (vitamin E) by High-performance liquid chromatography. It was ascertained that the size of the seed and kernel varies considerably. Pressing of whole seeds needs more energy (50%) than pressing of kernels. From a chemical point of view it seems to be very appropriate for a production of biofuels. Jatropha curcas contains more polyphenols and vitamin E, which act as antioxidants, than the rape. Due to the low content of unsaturated fatty acids it is chemically suitable to replace the rape-seed oil with Jatropha curcas oil.

scholarly journals Biophysical Characterization and Anticancer Activities of Photosensitive Phytoanthraquinones Represented by Hypericin and Its Model Compounds

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5666
Author(s):  
Valéria Verebová ◽  
Jiří Beneš ◽  
Jana Staničová
Keyword(s):  
Photodynamic Therapy ◽  
Biological Activities ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Anticancer Activities ◽  
Model Compounds ◽  
Antitumor Effects ◽  
Biophysical Characterization ◽  
Physical And Chemical ◽  
And Chemical Properties

Photosensitive compounds found in herbs have been reported in recent years as having a variety of interesting medicinal and biological activities. In this review, we focus on photosensitizers such as hypericin and its model compounds emodin, quinizarin, and danthron, which have antiviral, antifungal, antineoplastic, and antitumor effects. They can be utilized as potential agents in photodynamic therapy, especially in photodynamic therapy (PDT) for cancer. We aimed to give a comprehensive summary of the physical and chemical properties of these interesting molecules, emphasizing their mechanism of action in relation to their different interactions with biomacromolecules, specifically with DNA.

scholarly journals RESEARCH OF THE SYNTHETIC, PHYSICAL AND CHEMICAL PROPERTIES OF 3-ALKYLSULFONYL-5-(CHINOLINE-2-YL, 2-HYDROXYCHINOLINE-4-YL)-4-R -2,4-DIHYDRO3N-1,2,4-TRIAZOLES 1

2016 ◽  
Vol 10 (1) ◽  
pp. 81
Author(s):  
Kaplaushenko Tm ◽  
Panasenko Oi ◽  
Kucheryavy Yu
Keyword(s):  
Biological Effects ◽  
Chemical Properties ◽  
Biological Action ◽  
Pharmacological Properties ◽  
Physical And Chemical Properties ◽  
Element Analysis ◽  
Fundamental Research ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACTObjective: Fundamental research in pharmacy and medicine have shown that drugs, which are based on nucleus of the 1,2,4-triazole, have a widerange of biological effects. Derivatives of this heterocyclic system have well-known Ukrainian clinicians and the world scientists due to its antifungal,antidepressant, anticancer, cardio- and hepatoprotective properties. The pharmacological activity of most organic compounds depends on severaldifferent factors, including bioavailability of the substance. Hence, it is very important to consider the results of the synthetic and biological researchesand established dependence of structure on the biological action when scientists model new molecules or improve pharmacological properties of anexisting structure. One of the important social and economic problems of the pharmaceutical industry is the implementation in practice of new drugsthat could compete with expensive imported drugs. In recent times, 1,2,4-triazole-3-thioderivatives take attention of compatriots and scientists offoreign countries who are working on finding bioactive compounds including heterocyclic systems. The structure, physical and chemical properties,pharmacological activities of 1,2,4-triazoles, and their 3-thioderivatives are understudied. Hence, the study of that will be actually and novelty formodern science. The main purpose of our research is synthesis of 3-alkylsulfonyl-5-(chinoline-2-yl, 2-hydroxychinoline-4-yl)-4-R-2,4-dihydro-3N1,2,4-triazoles,studyingof its physicaland chemical properties.Methods: The initial compounds have been synthesized previously using known in literature techniques. Oxidation of the sulfur atom of thesynthesized compounds to the hexavalent condition was carried out adding solution of hydrogen peroxide.Results: The structure of the obtained compounds was determined with the modern physical and chemical analysis methods: Element analysis,infrared-spectrophotometry, and their individuality with thin layer chromatography.Conclusions: Prospect of the further researches is determination of acute toxicity and next studying of pharmacological properties of the synthesizedcompounds.Keywords: 1,2,4-triazoles, Synthesis, Chemical properties, Chinoline.1 

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