scholarly journals INFLUENCE OF STEM ROT ON THE COMPOSITION AND THE CONTENT OF PHENOLIC COMPOUNDS IN THE LEAVES OF BOPLAMIC POPULUS (POPULUS BALSAMIFERA L.) UNDER THE CONDITIONS OF URBANIZATION

2021 ◽  
pp. 155-161
Author(s):  
Evgeniy Vladimirovich Koltunov
Keyword(s):  
Phenolic Compounds ◽  
Biochemical Composition ◽  
High Growth ◽  
High Growth Rate ◽  
Urban Environments ◽  
Stem Rot ◽  
Populus Balsamifera ◽  
Leaf Extracts ◽  
Balsam Poplar ◽  
Mechanisms Of Adaptation

Balsam poplar is important component of landscaping urban environments. It’s characterized by high growth rate and resistance to negative environmental factors, but in urbanization conditions it’s intensely affected by diseases, especially stem rot. Biochemical composition of poplar has been studied, mainly in buds [1–4]. In leaves, it’s less studied [5–7]. Therefore, study of influence of stem rot on phenolic compounds of Balsam poplar leaves at urbanization conditions was main purpose of research. Biochemical composition of leaves was studied by HPLC. Chromatography of leaf extracts revealed 88 compounds, identified 22 of them. Predominant tendency was activation of their synthesis: 45.46%. Flavonoids are dominated in their composition (50%). 27.27% of compounds inhibition of phenolic compounds synthesis was observed, 27.27% content is not change. This is consequence of reaction to oxidative stress. Differences in composition of chemical compounds in leaves of control and diseased plants were not observed. Reaction of woody plants different species to stem rot and pollution is different. This is due to both the species-specificity of the reaction and different levels of resistance and tolerance of various species and different mechanisms of adaptation to these factors. Probably different species of plants have different strategies for dealing with effects of environments factors, it’s possible that similar mechanism exists for different species of stands affected by rot.

scholarly journals THE EFFECT OF THE STEM ROT AT COMPOSITION AND CONTENT OF PHENOLIC COMPOUNDS IN LEAVES OF BIRCH (BETULA PENDULA ROTH.)

2019 ◽  
pp. 169-176
Author(s):  
Yevgeniy Vladimirovich Koltunov
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Biochemical Composition ◽  
Betula Pendula ◽  
Stem Rot ◽  
Economic Damage ◽  
Biochemical Processes ◽  
Physiological And Biochemical

Stem rot cause significant ecological and economic damage to forests. Affected stands are prone to windbreaks and windfalls. Value of wood and stability of stands are reduced. Despite intensive studies of resistance biochemical aspects to rotting diseases, role of phenolic compounds remains insufficiently clarified. The purpose of research was studying composition of phenolic compounds in birch leaves with a significant level of damage to the diameter of the trunk. Stem rot was determined by taking core from trunk. Biochemical composition of leaves determined by HPLC. There are 64 phenolic compounds was revealed. 24 factions identified, 45.83% of compounds in affected trees, content was increased. Flavonoids are prevail (63.64%). In 45.83% of compounds, content decreased. They had predominance of flavonoids (81.82%). All compounds possess antioxidant activity. They contain phenolglycosides, determining entomoresistance (arbutin, salicin, salidroside). The results showed that with significant infestation with rot, there is an increase in the content of phenolic compounds in the leaves, therefore, the biochemical processes of combating oxidative stress are activated. This is due to violation of physiological and biochemical processes in diseased trees.

scholarly journals Extracts of Poplar Buds (Populus balsamifera L., Populus nigra L.) and Lithuanian Propolis: Comparison of Their Composition and Biological Activities

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 828
Author(s):  
Monika Stanciauskaite ◽  
Mindaugas Marksa ◽  
Mindaugas Liaudanskas ◽  
Liudas Ivanauskas ◽  
Marija Ivaskiene ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Biological Activities ◽  
Populus Nigra ◽  
Raw Material ◽  
Populus Balsamifera ◽  
Plant Materials ◽  
Antioxidant Power ◽  
Balsam Poplar ◽  
Black Poplar

Balsam poplar and black poplar (Populus balsamifera L. and Populus nigra L.) buds that grow in Lithuania are the primary source of propolis, therefore it is proper to evaluate and compare the composition of these raw plant materials and propolis quantitatively and qualitatively. Propolis and balsamic poplar bud extract are dominated by p-coumaric acid and black poplar-caffeic acid. Antioxidant activity was evaluated by DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS (2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), FRAP (ferric-reducing antioxidant power) and CUPRAC (cupric reducing antioxidant capacity) methods and all extracts showed antioxidant activity, and obtained results correlated with the obtained amounts of phenolic compounds and flavonoids in the extracts. Studies of antimicrobial activity have shown that all extracts have a growth inhibitory effect against Staphylococcus aureus and Candida albicans, but the extract of balsam poplar buds showed the most significant effect of such kind. Considering the results of the research, it can be stated that balsam poplar buds cultured in Lithuania are the primary raw material of propolis, which is rich in phenolic compounds with antioxidant properties and is a promising raw material for pharmaceutical purposes.

The Job Of Microfinance For The Advancement Of Self Help Groups In India

2019 ◽  
Vol 118 (8) ◽  
pp. 236-240
Author(s):  
Dr.R. Murugesan ◽  
M. Leelavathi ◽  
Dr. K. Ravindran
Keyword(s):  
High Growth ◽  
High Growth Rate ◽  
Entrepreneurial Skills ◽  
Self Help ◽  
The Poor ◽  
Total Food ◽  
Self Help Groups ◽  
Positive Step ◽  
Food Consumed

towards jumping from the category of developing economy to developed economy there is one big factor that stops and poses a hindrance in its path of advancement and that obstacle is termed as Poverty. The Indian economic policy focuses on a high growth rate along with a equal participation of the poor so that they avail the opportunities available in the market economy. And in order to ensure the participation of the poor it has become important for the country to create a platform where the poor can easily access the various financial products. Microfinance is one such strategy for inclusive growth. Microfinance can change the life of the poor though not completely but a reasonable change can be ensured. In different phases of life women play a crucial role despite the discrimination that is faced by them. But equality can be endowed to women by enhancing the entrepreneurial skills in them. This is possible through Self Help Groups (SHGs). In India women produce around 30% of the total food consumed but she gets only 10% of the property or wealth of the country. Development of women is inevitable for the development and growth of any economy. SHGs happen to be a positive step in this direction. Along with these mediums there should be a cheap and easy source of credit for them and Microfinance fulfills the requirement. This study aims to find the role of this strong medium of Microfinance in the advancement of SHGs in India

Assessment of Biotechnological Potential of Cyanobacteria and Microalgae Strains from IPPAS Culture Collection

2019 ◽  
pp. 12-29
Author(s):  
R.A. Sidorov ◽  
A.Yu. Starikov ◽  
A.S. Voronkov ◽  
A.S. Medvedeva ◽  
Z.V. Krivova ◽  
...  
Keyword(s):  
Biochemical Composition ◽  
Wide Spectrum ◽  
Food Additives ◽  
Mature Spore ◽  
High Growth ◽  
Biomass Productivity ◽  
Culture Collection ◽  
Growth Characteristics ◽  
Russian Science ◽  
Biotechnological Potential

As a result of screening of spore-forming bacteria, a B-13186 strain with a wide spectrum of antagonistic activity identified as Brevibacillus laterosporus by the analysis of sequences of variable sites of 16S rRNA was selected. Morphological, cultural and biochemical characteristics of the strain were studied. A distinctive feature of the strain is the presence of a canoe-like inclusion formed in sporangia and attached to the mature spore, as well as the ability to synthesize round-shaped crystalline inclusions. The strain was shown to be active against various species of gram-positive bacteria including A search for strains capable of simultaneously producing high amounts of several biologically valuable compounds and/or having high biomass productivity has been carried out. The growth characteristics and biochemical composition of 12 microalgae and cyanobacteria strains from the IPPAS Collection in the exponential and stationary growth phases were studied. All the strains had high growth rates (doubling time 6-22 h). The strains of Cyanobacterium sp. IPPAS B-1200, Chlorella sp. IPPAS C-1210, Nannochloris sp. IPPAS C-1509, Cyanidium caldarium IPPAS P-510 and Vischeria sp. IPPAS H-242 demonstrated the highest biotechnological potential and can be used for the production of various types of biofuel, pigments, feed and food additives, including those with high content of eicosapentaenoic (20:5 Δ5,8,11,14,17) acid content. microalgae, cyanobacteria, biochemical composition, fatty acids, valuable metabolites, growth characteristics This work was supported by a grant from the Russian Science Foundation [no. 14-14-00904]

Exploring SiC Growth Limitation of Vapor-Liquid-Solid Mechanism when Using Two Different Carbon Precursors

2013 ◽  
Vol 740-742 ◽  
pp. 323-326
Author(s):  
Kassem Alassaad ◽  
François Cauwet ◽  
Davy Carole ◽  
Véronique Soulière ◽  
Gabriel Ferro
Keyword(s):  
Growth Rate ◽  
High Growth ◽  
High Growth Rate ◽  
Carbon Precursor ◽  
Growth Limitation ◽  
Vapor Liquid Solid ◽  
Partial Pressures ◽  
Vapor Liquid Solid Mechanism ◽  
Vls Growth ◽  
Vapor Liquid

Abstract. In this paper, conditions for obtaining high growth rate during epitaxial growth of SiC by vapor-liquid-solid mechanism are investigated. The alloys studied were Ge-Si, Al-Si and Al-Ge-Si with various compositions. Temperature was varied between 1100 and 1300°C and the carbon precursor was either propane or methane. The variation of layers thickness was studied at low and high precursor partial pressure. It was found that growth rates obtained with both methane and propane are rather similar at low precursor partial pressures. However, when using Ge based melts, the use of high propane flux leads to the formation of a SiC crust on top of the liquid, which limits the growth by VLS. But when methane is used, even at extremely high flux (up to 100 sccm), no crust could be detected on top of the liquid while the deposit thickness was still rather small (between 1.12 μm and 1.30 μm). When using Al-Si alloys, no crust was also observed under 100 sccm methane but the thickness was as high as 11.5 µm after 30 min growth. It is proposed that the upper limitation of VLS growth rate depends mainly on C solubility of the liquid phase.

scholarly journals Influence of Adding Encapsulated Phase Change Materials in Aerial Lime Based Mortars

2013 ◽  
Vol 687 ◽  
pp. 255-261 ◽  
Author(s):  
Sandra Cunha ◽  
José Barroso Aguiar ◽  
Victor Ferreira ◽  
António Tadeu
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Renewable Energy Sources ◽  
High Growth ◽  
High Energy ◽  
High Growth Rate ◽  
Aesthetic Appearance ◽  
Hardened State ◽  
High Energy Consumption

Increasingly in a society with a high growth rate and standards of comfort, the need to minimize the currently high energy consumption by taking advantage of renewable energy sources arises. The mortars with incorporation of phase change materials (PCM) have the ability to regulate the temperature inside buildings, contributing for an increase in the level of thermal comfort and reduction of the use of heating, ventilation and air conditioning (HVAC) equipment, using only the energy supplied by the sun. However, the incorporation of PCM in mortars modifies some of its characteristics. Therefore, the main objective of this study was the characterization of mortars doped with two different phase change materials. Specific properties of different PCM, such as particle size, shape and enthalpy were studied, as well as the properties of the fresh and hardened state of these mortars. Nine different compositions were developed which were initially doped with microcapsules of PCM A and subsequently doped with microcapsules of PCM B. It was possible to observe that the incorporation of phase change materials in mortars causes differences in properties such as compressive strength, flexural strength and shrinkage. After the study of the behaviour of these mortars with the incorporation of two different phase change materials, it was possible to select the composition with a better compromise between its aesthetic appearance, physical and mechanical characteristics.

Sign in / Sign up

Export Citation Format

Share Document