scholarly journals Biological activity of colloidal solutions of silver, obtained by means of sálix cáprea extract

2019 ◽  
Vol 60 (10) ◽  
pp. 54-59
Author(s):  
Maria B. Nikishina ◽  
◽  
Evgenia V. Ivanova ◽  
Yury M. Atroschenko ◽  
Irina V. Shahkeldyan ◽  
...  
Keyword(s):  
Biological Activity ◽  
Fungicidal Activity ◽  
Amylase Activity ◽  
Silver Particles ◽  
Colloidal Solutions ◽  
Silver Recovery ◽  
Silver Colloids ◽  
Salix Caprea ◽  
Colloid Formation ◽  
Wheat Seeds

The presented publication is devoted to the study of the biological activity of silver colloids synthesized based on extracts obtained from various parts of the goat willow plant (Sálix cáprea). The ability of colloidal silver solutions of various concentrations to stimulate growth processes in wheat seeds at the germination stage is analyzed. The effect of colloidal solutions on the catalytic effect of amylase was studied. The fungicidal activity of synthesized silver particles was studied. For the study, colloidal silver particles were obtained by the "green synthesis" method. Extracts of goat willow bark, leaves and buds of varying degrees of dilution were used as a reducing agent. The analysis of sugar content and pH of solutions of plant extracts before and after colloid formation was carried out in order to establish the participation of sugars and acids in the process of silver recovery. The biological activity of colloids was analyzed on the seeds of winter wheat cultivar "Moskovskaya-39". The germination energy of wheat seeds was determined on the 3rd day after sowing by counting the germinated seeds. Amylase activity was measured in the roots and shoots of wheat plants by the amount of undecomposed starch by spectrophotometry. Fungicidal activity was studied with respect to fungi: F. moniliforme, F. oxysporum, S. sclerotiorum, V. inaequalis, R. solani, B. sorokiniana, P. ostreatus. The data obtained show that the sugars that make up the initial extracts of various parts of goat willow are completely consumed in the process of silver recovery and the formation of colloidal particles. A change in the acid content at the stage of colloid formation does not allow us to draw an unambiguous conclusion about the mechanism of participation of these compounds in the process of colloid formation. A study of the biological activity of synthesized silver colloids showed their high ability to stimulate growth processes in wheat seeds. A study of enzymatic catalysis also shows, in general, the positive effect of silver colloids on amylase activity within 1 minute of the starch hydrolysis reaction. An analysis of the data obtained in the study of fungistaticity suggests that silver colloids obtained in extracts from leaves, bark and willow inflorescences exhibit high fungicidal activity against F. moniliforme, S. sclerotiorum, P. ostreatus and B. sorokiniana.

scholarly journals Study of the biological activity of anionic adduts of 5,7-dinitrobenz[d]oxazole

2019 ◽  
Vol 58 (5) ◽  
pp. 32-38
Author(s):  
Loik G. Mukhtorov ◽  
◽  
Maria B. Nikishina ◽  
Evgenia V. Ivanova ◽  
Yury M. Atroschenko ◽  
...  
Keyword(s):  
Biological Activity ◽  
Amylase Activity ◽  
Wheat Plant ◽  
Maximal Growth ◽  
Wheat Roots ◽  
High Biological Activity ◽  
Routes Of Administration ◽  
Germination Energy ◽  
On Line ◽  
Wheat Seeds

In this paper, we studied the effect of anionic adducts of 5,7-dinitrobenz[d]oxazole on the sowing properties of wheat seeds (germination energy and germination), the growth rate of wheat shoots, amylase activity in the roots and shoots of wheat. The evaluation of the toxicity of the tested compounds was carried out using the GUSAR on-line computer program. A prediction was made of bioaccumulation factor (BCF), the average lethal concentration for daphnia and minnow (LD50), the concentration of half-maximal growth inhibition (IGC50) and the acute toxicity indicators (LD50) for rats with different routes of administration. For the study were selected: 2-methoxy-5,7-dinitro-2 (piperidin-1-yl)-2,3-dihydrobenzo[d]oxazole, 2-methoxy-5,7-dinitro-1,2-dihydrobenzo[d]sodium oxazolide, 2-methyl-2-methoxy-5,7-dinitro-1,2-dihydro-benzo[d]cesium oxazolide, 2-phenyl-2-methoxy-5,7-dinitro-1,2-dihydrobenzo[d]sodium oxazolide and 2-methyl-2-ethoxy-5,7-dinitro-1,2-dihydrobenzo[d]oxazolid cesium. Biological activity was analyzed on wheat seeds of the winter variety Moskovskaya 39. Aqueous solutions of the studied substances were used with concentrations: 1·10-4 mol/l, 1·10-6 mol / l, 1·10-8 mol/l, 1·10-10 mol/l, 1·10-12 mol/l and 1·10-14 mol/l. The germination energy of wheat seeds was determined on day 3, and germination on the 9th day after sowing by counting germinated seeds. Values are expressed as a percentage of the total number of seeds sown. Biometric indicators (height of shoots) were determined on the 9th day after sowing. Amylase activity was measured in the roots and shoots of wheat plants by the amount of undecomposed starch using spectrophotometry. The data obtained allow us to conclude that different substituents in the anionic adducts of 5,7-dinitrobenz[d]oxazole in varying degrees contribute to the manifestation of biological activity at different stages of wheat plant growth. During the first three days, 2-methyl-2-ethoxy-5,7-dinitro-1,2-dihydrobenzo [d]oxazolid cesium affects the growth processes in wheat seeds most actively. The growth of wheat shoots is stimulated to a greater extent by solutions of 2-methoxy-5,7-dinitro-1,2-dihydrobenzo[d]oxazolid sodium with concentrations of 1·10–4 and 1·10–6 mol/l and solution 2-phenyl-2-methoxy-5,7-dinitro-1,2-dihydroben-zo[d]oxazolid sodium with a concentration of 1·10-8 mol/l. Amylase activity in wheat roots is increased by solutions of 2-methyl-2-methoxy-5,7-dinitro-1,2-dihydrobenzo[d]cesium oxazolid in the whole range of concentrations used, and in the shoots – solutions of 2-methoxy-5,7-dinitro-1,2-dihydrobenzo[d]oxazolid sodium in the range of all tested concentrations. In general, anionic adducts of 5,7-dinitrobenz[d]oxazole exhibit high biological activity in relation to wheat plants in the early stages of development.

scholarly journals Biological activity of benzoxazolinone and benzoxazolinthione derivatives

2021 ◽  
Vol 258 ◽  
pp. 04017
Author(s):  
K Giyasov ◽  
G. S. Turaeva ◽  
H T Turaeva
Keyword(s):  
Biological Activity ◽  
Powdery Mildew ◽  
Fungicidal Activity ◽  
Butyl Ester ◽  
Growing Season ◽  
Erysiphe Graminis ◽  
Carbamic Acid ◽  
Fungicidal Action ◽  
Derivatives Of

The article presents the herbicidal, defoliating, fungicidal properties of the synthesized derivatives of benzoxazolinones and benzoxazolinethions. It was shown that 3-alkylbenzoxazolinones, 3-alkyl-6-halobenzoxazolinones and 2-alkylthiobenzoxazoles exhibit herbicidal action during the growing season of plants, and they also cause cotton leaves to drop up to 70%. It was found that 3-alkylbenzoxazolinones and 2-alkylthiobenzoxazoles exhibited fungicidal activity against the pathogen, Fugarium oxyporum and Verticillum dahlia. Among them, 2-methylthiobenzoxazole inhibited spores of the fungi Verticillum dahlia by 96.4% and benzoxazolyl-2-carbamic acid butyl ester by 65%. These compounds exhibit fungicidal action against the pathogens of powdery mildew on cucumbers - Erysiphe cichoraceorum and powdery mildew on wheat - Erysiphe graminis, approaching the control Karatan. Apparently, these compounds are chemicals of contact action.

Electronic aspects of fungicidal activity in transition metal dithiocarbamate complexes

1975 ◽  
Vol 28 (11) ◽  
pp. 2393 ◽  
Author(s):  
RM Golding ◽  
K Lehtonen ◽  
BJ Ralph
Keyword(s):  
Electronic Structure ◽  
Biological Activity ◽  
Transition Metal ◽  
Spin State ◽  
Metal Ion ◽  
Redox Reactions ◽  
Fungicidal Activity ◽  
Receptor Site ◽  
Iron Ion ◽  
Reversible Redox

In this study of the fungicidal activity of a series of transition metal ion dithiocarbamates in relation to their electronic structure, a model is presented to interpret the biological activity of these complexes, namely the ability of the complex to fit into a receptor site and its ability to undergo reversible redox reactions at suitable potentials. It is shown that in the case of the iron(III) dithiocarbamate complexes these properties are manifested in the spin state of the iron ion.

Scutellar Amylase Activity in Naturally Aged and Accelerated Aged Wheat Seeds

1992 ◽  
Vol 69 (6) ◽  
pp. 497-501 ◽  
Author(s):  
GITALI DAS ◽  
SWATI SEN-MANDI
Keyword(s):  
Amylase Activity ◽  
Wheat Seeds

scholarly journals BIOLOGICAL ACTIVITY OF EXTRACTS OF PLANT HAPLOPHYLLUM PERFORATUM

2020 ◽  
Vol 2 (10(79)) ◽  
pp. 76-79
Author(s):  
U. Mamarozikov ◽  
S. Turaeva ◽  
R. Zakirova ◽  
N. Khidirova
Keyword(s):  
Biological Activity ◽  
Ethyl Acetate ◽  
High Activity ◽  
Fungicidal Activity ◽  
Ethanol Extract ◽  
Ethyl Acetate Fraction ◽  
Chloroform Fraction ◽  
Microscopic Fungus ◽  
Haplophyllum Perforatum ◽  
Water Alcohol

The article presents the results of studies of the fungicidal and growth-stimulating activity of various parts of the ethanol extract of the plant H. perforatum. As a result of fractionation of the extract, a hexane fraction, a chloroform fraction, an ethyl acetate fraction, and a water-alcohol residue were obtained. The ethanol extract showed a high fungicidal activity against the microscopic fungus Fusarium oxisporum. The study of the growthstimulating effect on the culture of cucumbers showed a high activity of the hexane part of the extract.

DEPENDENCE OF THE BIOLOGICAL ACTIVITY OF FUNGICID FOR SEED TREATMENT ON PARTICLE SIZE

2020 ◽  
pp. 220-221
Author(s):  
L. Elinevskaya ◽  
V. Pavlov ◽  
K. Kienskaya ◽  
A. Kuskov
Keyword(s):  
Particle Size ◽  
Biological Activity ◽  
Antifungal Activity ◽  
Quantitative Determination ◽  
Seed Treatment ◽  
Particle Sizes ◽  
Wet Milling ◽  
Milling Method ◽  
Wheat Seeds

Wheat seeds were treated with suspensions of tebuconazole with different particle sizes which were obtained by wet-milling method. Mycological studies and quantitative determination of mycotoxin by HPLC were carried out. The dependence of antifungal activity on the particle size in the preparation is shown.

scholarly journals Structure and spectra of photochemically obtained nanosized silver particles in presence of modified porous silica

2005 ◽  
Vol 7 (4) ◽  
pp. 193-198 ◽  
Author(s):  
Galina Krylova ◽  
Anna Eremenko ◽  
Natalia Smirnova ◽  
Susie Eustis
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Colloidal Silica ◽  
Isopropyl Alcohol ◽  
Morphological Changes ◽  
Porous Silica ◽  
Silver Particles ◽  
Silver Colloids ◽  
Transmission Electron ◽  
Organic Sensitizer

Mesoporous silica powders and films modified with organic sensitizer benzophenone were used as photocatalysts in the reaction of silver ion reduction by isopropyl alcohol under UV-irradiation withλ=253.7 nm and 365 nm in presence of colloidal silica as stabilizer. Morphological changes of silver colloids during irradiation were studied using transmission electron microscopy, and correlated to the absorption spectra.

scholarly journals Biological Activity of Halogen-Containing Derivatives of N-Substituted Quinone Imines

2020 ◽  
Vol 10 (6) ◽  
pp. 7070-7076
Keyword(s):  
Biological Activity ◽  
Phytophthora Infestans ◽  
Growth And Development ◽  
Fungicidal Activity ◽  
Quinone Imine ◽  
Herbicidal Activity ◽  
Chlorine Atoms ◽  
Imine Compounds ◽  
Derivatives Of

The different halogen-containing derivatives of N-substituted quinone imines have been synthesized by the halogenation and hydrohalogenation of the corresponding quinone imines. N,N'-(Cyclohexa-2-en-1,4-diylidene)-diarylsulfonamides are good insecticides. They cause 89–97% of the insects to die. Compared with quinone imine, compounds having 4-oxocyclohexa-2,5-en-1-ylidene structure show higher fungicidal activity. N-(3,5-Dichloro-4-oxocyclohexa-2,5-dien-1-ylidene)-4-methylbenzene-1-sulfonamide and 4-chloro-N-[2,3,5,5,6,6-hexachloro-4-oxocyclohexa-2-en-1-ylidene]benzene-1-sulfonamide inhibit the growth and development of Phytophthora infestans by 82 and 81%, respectively. N-[2,3,5,5,6,6-Hexachloro-4-oxocyclohexa-2-en-1-ylidene]-4-methylbenzene-1-sulfonamide has a high herbicidal activity. The compounds with the largest number of chlorine atoms have the highest insecticidal, fungicidal, and herbicidal activity.

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