Chemistry Journal of Moldova

Physical chemistry and chemical physics

LACTOFERRIN: ANALYSIS OF THE STRUCTURE PROFILE

Author(s):

Lilia Anghel


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.2
Pages: 99-106
Keywords: iron, protein, lactoferrin, transferrin, multiple sequence alignment
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(2).14

Graphical Abstract:
 The multitude of physiological processes in which the binding of iron ions takes part makes its mechanism worth investigating. The multiple sequence alignment method was applied to investigate the structure similarities of five lactoferrin X-ray crystallographic structures and outline the differences and similarities between lactoferrin and serum transferrin. The results of this study provide useful insights into the mechanism of iron-binding of lactoferrin molecule.



Downloads: 65

MALDI-TOF INVESTIGATION OF LYSOZYME-ALBUMIN INTERACTION

Author(s):

Marharyta Vasylieva, Taras Gromovoy


Field: Physical chemistry and chemical physics
Type: Short communication
Issue: 2014 Volume 9, no.2
Pages: 107-110
Keywords: MALDI-TOF, albumin, lysozyme, protein-protein interaction
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(2).15

Graphical Abstract: 
Proteins are the main components of living systems therefore they are a subject of study from different points of view. Under certain conditions, proteins are capable of self-organization forming oligomeric structures of various composition and new properties. The investigations of these transformations were carried out on two well known proteins: albumin and lyzozyme. It is shown that associates of albumin and lysozyme are formining in the stoichiometric ratios of 1:1, 1:2, 1:3, 1:4. A similar pattern is observed in the case of albumin dimer.



Downloads: 47

HOLOGRAPHIC INFORMATION MEDIA BASED ON AZO-POLYMERS WITH DIFFERENT STRUCTURES

Author(s):

Irina Davidenko


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 112-116
Keywords: azobenzene, metallic polycomplexes, polymer composition, electrooptical effect, polarization holohraphy
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(1).14

Graphical Abstract:
 Polarization sensitive holographic recording was accomplished in new synthesized azobenzene polymer composites with Co metallic polycomplexes of different structure.



Downloads: 25

HOLOGRAPHIC RECORDING MEDIA BASED ON ELECTRONS DONOR OLIGOMERS

Author(s):

Nicolay Davidenko, Irina Davidenko, Nicolay Chuprina, Yuriy Getmanchuk., Leonid Kostenko, Elena Mokrinskaya, Valeriy Pavlov, Sergey Studzinsky, Larisa Tonkopieva


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 117-122
Keywords: carbazole, oligomer, photothermoplastic, holographic recording
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(1).15

Graphical Abstract: 
Information properties of recording media based on electrons donor oligomer of different structure for thermoplastic technique are investigated.




Downloads: 17

AMINOSILICA NANO- AND SUBMICROSPHERES: ANALYSIS OF FACTORS INFLUENCING MORPHOLOGY, STRUCTURE AND PROPERTIES

Author(s):

Inna Melnyk


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 123-127
Keywords: silica nanoparticles and submicrospheres, aminopropyl groups, Stöber method
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(1).16

Graphical Abstract:
 Current paper focuses on the analysis of influence of main factors (stages of the synthesis, the ratio of the reacting components, the order of their introduction, the concentration of water and ammonia, the synthesis temperature) on the morphology, size and content of functional groups of aminosilicanano- and submicrospheres. The recommendations for the synthesis of particles with predetermined properties were done. It is shown, that the ratio of the reacting components mainly affects the content of 3-aminopropyl functional groups and the temperature of the hydrolytic polycondensation reaction - the size of the particles.



Downloads: 37

SYNTHESIS AND CHARACTERIZATION OF CdSe COLLOIDAL QUANTUM DOTS IN ORGANIC SOLVENT

Author(s):

Ion Geru, Olga Bordian, Constantin Loshmansky, Ion Culeac, Constantin Turta


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 128-131
Keywords: colloidal quantum dots, semiconductor, cadmium selenide, nanocrystals, photoluminescence
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(1).17

Graphical Abstract:
 In this paper we present experimental results on preparation and characterization of colloidal CdSe quantum dots in organic solvent. CdSe QDs were synthesized following a modified literature method.
CdSe QDs were isolated by adding acetone to the cooled solution followed by centrifugation.
CdSe QDs have been characterized by UV-Vis absorption and photoluminescent (PL) spectroscopy. The average CdSe particles size estimated from the UV-Vis absorption spectra was found to be in the range 2.28-2.92 nm which is in good agreement with PL measurements. 

Downloads: 85

A REVIEW OF THE BIOGENESIS OF IRON NANOPARTICLES USING MICROORGANISMS AND THEIR APPLICATIONS

Author(s):

Lilia Anghel, Gheorghe Duca


Field: Physical chemistry and chemical physics
Type: Review
Issue: 2013 Volume 8, no.2
Pages: 32-41
Keywords: nanoparticles, iron, microorganisms, biological synthesis, biomedical applications
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DOI:
dx.doi.org/10.19261/cjm.2013.08(2).03

Graphical Abstract:
Iron-based nanoparticles have gained a lot of attention due to their properties which offer a broad range of biomedical and industrial applications. Traditional methods of synthesis of iron nanoparticles strongly influence their properties and limit their applicability. Recently, there has been a growing interest in the development of biological routes of syntheses of iron nanoparticles as the resulting particles have structural characteristics required by biomedical field. The mechanism for the synthesis of iron-based nanoparticles by microorganisms and its current limitation are presented.



Downloads: 44

THE INFLUENCE OF THE POROUS STRUCTURE OF LOCAL ACTIVATED CARBONS ON THE IMMOBILIZATION OF THE CONGO RED DYE AND VITAMIN B 12

Author(s):

N. Timbaliuc, T. Lupascu


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 90-94
Keywords: activated carbons, adsorption, mesopore volume, Congo Red, vitamin B12.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).11

Graphical Abstract:
The adsorption properties of activated carbons, obtained from local raw materials (nut shells, peach and plum stones), towards Congo Red and vitamin B12 have been studied.  The values of adsorption of these marker-substances are in direct correlation with the structural characteristics of the studied samples of activated carbons, in particular, with their mesopore volume.

Downloads: 23

NONEXPERIMENTAL SCREENING OF THE WATER SOLUBILITY, LIPOPHILICITY, BIOAVAILABILITY, MUTAGENICITY AND TOXICITY OF VARIOUS PESTICIDES WITH QSAR MODELS AID

Author(s):

O.G. Kolumbin, L.N. Ognichenko, A.G. Artemenko, P.G. Polischuk, М.A. Kulinsky, Е.N. Мuratov, V.E. Kuz’min, V.A. Bobeica


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 95-100
Keywords: pesticides, toxicological analysis, QSAR, lipophilicity, RF method.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).12

Graphical Abstract:
In our study the dataset containing 489 pesticides and their active substances of different classes of organic compounds was used for analysis. For compounds of analyzed dataset the values of lipophilicity, water solubility, toxicity, bioavailability and mutagenicity were predicted by developed QSAR models. The most environmentally hazardous substances were identified using prediction of QSAR models for pesticides. The satisfactory coincidence between the experimental values of investigated properties and their predicted values by QSAR models was obtained (coefficient of determination in the range 83-94 %).

Downloads: 30

INTERACTION OF ALBUMIN AND IMMUNOGLOBULIN G WITH SYNTHETIC HYDROXYAPATITE

Author(s):

E. Pylypchuk, V. Mishchenko and T. Yu. Gromovoy


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 143-146
Keywords: MALDI-ToF, X-ray phase analysis, albumin, immunoglobulin G, hydroxyapatite, interaction.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2012.07(2).02

Graphical Abstract:
 It was shown by X-ray phase analysis, IR spectra analysis and MALDI-ToF mass spectrometry methods that interaction of synthetic hydroxyapatite with a solution of immunoglobulin G leads to its partial dissolution due to leaching from the surface of calcium triphosphate which, in our opinion, forms complexes with immunoglobulin G.

Downloads: 27