scholarly journals Spatial and temporal characterization of the physicochemical parameters and phytoplankton assemblages in Dodurga Reservoir (Sinop, Turkey)

2015 ◽  
Vol 39 ◽  
pp. 547-554
Author(s):  
Seda HASIRCI MUSTAK ◽  
Elif TEZEL ERSANLI
Keyword(s):  
Physicochemical Parameters ◽  
Phytoplankton Assemblages

scholarly journals Characterization of Multifloral Honeys from Angola by Their Physicochemical Parameters

2018 ◽  
Vol 7 (2) ◽  
pp. 1869-1875
Author(s):  
Vanya Manolova ◽  
Ivayla Parvina ◽  
Todorka Yankovska Stefanova ◽  
Elissaveta Luchanska ◽  
Ralitsa Balkanska
Keyword(s):  
Physicochemical Parameters

scholarly journals Synthesis and characterization of the aluminium phosphates modified with ammonium, calcium and molybdenum by hydrothermal method

2016 ◽  
Vol 18 (2) ◽  
pp. 131-139
Author(s):  
Kinga Łuczka ◽  
Barbara Grzmil ◽  
Bogumił Kic ◽  
Krzysztof Kowalczyk
Keyword(s):  
Particle Size ◽  
Physicochemical Parameters ◽  
Average Particle Size ◽  
Synthesis And Characterization ◽  
Average Particle ◽  
Influence Of Process Parameters ◽  
Molar Ratios ◽  
Aluminum Phosphates ◽  
The Individual

Abstract Synthesis and characterization of the aluminum phosphates modified with ammonium, calcium and molybdenum were conducted. The influence of process parameters (reactive pressure and molar ratios) in the reaction mixture were studied. The contents of the individual components in the products were in the range of: 10.97–17.31 wt% Al, 2.65–13.32 wt% Ca, 0.70–3.11 wt% Mo, 4.36–8.38 wt% NH3, and 35.12–50.54 wt% P2O5. The materials obtained in the experiments were characterized by various physicochemical parameters. The absorption oil number was in the range from 67 to 89 of oil/100 g of product, the surface area was within the range of 4–76 m2/g, whereas the average particle size of products reached 282–370 nm. The Tafel tests revealed comparable anticorrosive properties of aluminum phosphates modified with ammonium, calcium, molybdenum in comparison with commercial phosphate.

scholarly journals DOSAGE FORM DEVELOPMENT AND PRELIMINARY PHYSICOCHEMICAL CHARACTERIZATION OF TRIKANTAKADI KVATHA

2017 ◽  
Vol 10 (16) ◽  
pp. 52
Author(s):  
Swati Sharma ◽  
Dileep Singh Baghel ◽  
Saurabh Singh ◽  
Sachin Kumar Singh
Keyword(s):  
Physicochemical Parameters ◽  
Dosage Form ◽  
Classical Method ◽  
Physicochemical Characterization ◽  
Dosage Forms ◽  
Remarkable Difference ◽  
Standard Value ◽  
Form Development ◽  
Layer Chromatography

  Objective: This is aimed to study the development of different dosage form and physicochemical characterization of Trikantakadi Kvatha (TK).Methods: Stability, shelf life, non-convenient, and large dosages administration are the major concern for Kvatha. To overcome these problems, an effort has been made to modify the formulation without changing its efficacy into various dosage forms such as tablet, syrup, and tincture. Comparative pharmacognostic, physicochemical, and phytochemical parameters of crude herbs and prepared formulations were investigated. TK was prepared by classical method mentioned in literature and converted into TK syrup, TK Ghana vati, and Trikantakadi tincture (TT). Precaution should be taken during the processing of formulations. TT placed at a dark place in airtight container.Results: Physicochemical and phytochemical investigations are not shown any remarkable variations with various prepared dosage forms. The Rf range observed between the 0.08 and 0.80 follows the standard value when compared with the reference of plant drug used for the preparation of dosage form.Conclusion: The prepared dosages forms were not exhibited any remarkable difference according to thin-layer chromatography studies and physicochemical parameters. However, the developed dosage forms are more stable than kvatha.

scholarly journals Comparative analysis of freshwater phytoplankton communities in two lakes of Burabay National Park using morphological and molecular approaches

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dmitry V. Malashenkov ◽  
Veronika Dashkova ◽  
Kymbat Zhakupova ◽  
Ivan A. Vorobjev ◽  
Natasha S. Barteneva
Keyword(s):  
National Park ◽  
Phytoplankton Assemblages ◽  
Freshwater Phytoplankton ◽  
Molecular Approaches ◽  
Phytoplankton Communities ◽  
Total Phytoplankton ◽  
Next Generation Sequencing Ngs ◽  
Taxonomic Characterization ◽  
Generation Sequencing

AbstractWe analyzed phytoplankton assemblages’ variations in oligo-mesotrophic Shchuchie and Burabay lakes using traditional morphological and next-generation sequencing (NGS) approaches. The total phytoplankton biodiversity and abundance estimated by both microscopy and NGS were significantly higher in Lake Burabay than in Lake Shchuchie. NGS of 16S and 18S rRNA amplicons adequately identify phytoplankton taxa only on the genera level, while species composition obtained by microscopic examination was significantly larger. The limitations of NGS analysis could be related to insufficient coverage of freshwater lakes phytoplankton by existing databases, short algal sequences available from current instrumentation, and high homology of chloroplast genes in eukaryotic cells. However, utilization of NGS, together with microscopy allowed us to perform a complete taxonomic characterization of phytoplankton lake communities including picocyanobacteria, often overlooked by traditional microscopy. We demonstrate the high potential of an integrated morphological and molecular approach in understanding the processes of organization in aquatic ecosystem assemblages.

UV Spectrophotometry as a Non-parametric Measurement of Water and Wastewater Quality Variability

2005 ◽  
Vol 40 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Olivier Thomas ◽  
Estelle Baurès ◽  
Marie-Florence Pouet
Keyword(s):  
Physicochemical Parameters ◽  
Weather Conditions ◽  
Uv Spectra ◽  
Uv Spectrophotometry ◽  
Dilution Factor ◽  
Uv Absorption Spectra ◽  
Wastewater Quality ◽  
Water And Wastewater ◽  
Non Parametric

Abstract The composition of water and wastewater, varying temporally and spatially, depends on factors such as environmental context, types of pollution sources, weather conditions leading to dilution or solids transportation, length of sewer network, etc. Because quantitative parameters are often not adapted for the characterization of wastewater quality variability, a non-parametric measurement is proposed, based on comparison of the UV absorption spectra of samples. The presence of isosbestic points, occurring in the set of spectra either directly or indirectly after normalization, allows quantification of the variability of a given water or effluent. A normalization step is used when dilution exists in the case of a mixture of water types (discharge or rain). Several examples show how to calculate the variability or to estimate the dilution factor from UV spectra data, even without results of physicochemical parameters.

Characterization of sulfate-reducing bacteria isolated from oil-field waters

1996 ◽  
Vol 42 (3) ◽  
pp. 259-266 ◽  
Author(s):  
C. Tardy-Jacquenod ◽  
P. Caumette ◽  
R. Matheron ◽  
C. Lanau ◽  
O. Arnauld ◽  
...  
Keyword(s):  
Physicochemical Parameters ◽  
Sulfate Reducing Bacteria ◽  
Oil Field ◽  
Oil Fields ◽  
Gulf Of Guinea ◽  
Sulfate Reducing ◽  
The North ◽  
The North Sea ◽  
Reducing Bacteria

The occurrence and metabolic capacities of sulfate-reducing bacteria (SRB) were studied in 23 water samples taken from producing wells at 14 different sites. Oil fields in France, the North Sea, and the Gulf of Guinea were selected and classified according to physicochemical parameters (salinity ranging from 0.3 to 120 g∙L−1 and temperature between 29 and 85 °C). After the distribution of SRB within oil fields was studied, several strains of SRB were isolated and characterized metabolically. Twenty of the thirty-seven strains were not related to any known species. Most of the identified strains were members of the genera Desulfovibrio and Desulfotomaculum by molecular, morphological, and physiological properties.Key words: sulfate-reducing bacteria, oil-field ecology, metabolic identification, biodiversity.

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