Molluscan diversity of coastal Karnataka, India and role of physicochemical parameters on their diversity

2021 ◽  
Vol 26 (1) ◽  
Author(s):  
Sandhya Leeda D’Souza ◽  
Neevan D’Souza ◽  
K Bhasker Shenoy
Keyword(s):  
Physicochemical Parameters ◽  
Molluscan Diversity

scholarly journals Relative importance of the bacteria Brucella, Salmonella, Staphylococcus and other indicator bacteria in some mountain farm waters in West-Cameroon (Central Africa) and the potential role of some environmental factors

2020 ◽  
Vol 8 (2) ◽  
pp. 081-084
Author(s):  
Pierrette Ngo Bahebeck ◽  
Mireille Ebiane Nougang ◽  
Paul Alain Nana ◽  
Claire Stéphane Metsopkeng ◽  
Antoine Tamsa Arfao ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Surface Waters ◽  
Brucella Abortus ◽  
Physicochemical Parameters ◽  
Potential Role ◽  
Abiotic Factors ◽  
Central Africa ◽  
Mountainous Regions ◽  
Brucella Suis

A bacteriological and physicochemical study was conducted in the waters of farms in mountainous regions of Cameroon. The different water samples were collected during two campaigns in December 2018 and February 2019. Ten stations representing the drinking water supply points in our study area were identified. The results showed that these waters contained both pathogenic and commensal fecal bacteria. The highest abundances reached 10x103 CFU/100mL for Salmonella sp., 72x103 CFU/100mL for Staphylococcus aureus, 102x103 CFU/100mL for Brucella suis and 40x103 CFU/100mL for Brucella abortus. These abundances were subject to space-time fluctuations. Water contamination by tweezers was not general and was present only in surface waters (rivers and ponds). The water in the ponds, rivers and wells analyzed were all basic, with low mineralization on average. The dissolved oxygen ranged from 37.5 to 70.6%, nitrate from 3.7 to 19.8 mg/L and iron from 0.01 to 3.5 mg/L. Most of the physicochemical parameters were relatively stable during the two campaigns. The degree of correlation between the physicochemical parameters and the abundance dynamics of the isolated bacteria was heterogeneous. This was clearly more pronounced with Salmonella sp. and Brucella suis. This would be due to the fraction of metabolically active cells present when the bacteria are exposed to unfavorable conditions. Correlations with the abiotic factors were less marked with Staphylococcus aureus and Brucella abortus; this would be due to their tolerance to environmental stresses.

Role of physicochemical parameters associated with the hydrophobic vs. amphiphilic biodegradable polymer nanoparticles formation

2020 ◽  
Vol 318 ◽  
pp. 113977
Author(s):  
Debasish Saha ◽  
Sugam Kumar ◽  
Debes Ray ◽  
Joachim Kohlbrecher ◽  
Vinod K. Aswal
Keyword(s):  
Biodegradable Polymer ◽  
Physicochemical Parameters ◽  
Polymer Nanoparticles

scholarly journals The presence of Vibrionaceae, Betanodavirus and Iridovirus in marine cage-cultured fish: Role of fish size, water physicochemical parameters and relationships among the pathogens

2017 ◽  
Vol 7 ◽  
pp. 57-65 ◽  
Author(s):  
Azila Abdullah ◽  
Rimatulhana Ramli ◽  
Mohd Syafiq Mohammad Ridzuan ◽  
Munira Murni ◽  
Shahidan Hashim ◽  
...  
Keyword(s):  
Physicochemical Parameters ◽  
Fish Size ◽  
Cultured Fish

scholarly journals Evaluation of the role of Shodhana (Purification) process in Croton tiglium seeds for reduction of toxic content

2021 ◽  
Vol 12 (3) ◽  
pp. 565-575
Author(s):  
Ajay Kumar Meena ◽  
Poorna Venkataraman ◽  
Ravindra Singh ◽  
Kusuma Ganji ◽  
Murali Krishna C ◽  
...  
Keyword(s):  
Physicochemical Parameters ◽  
Chemical Constituents ◽  
Seed Extract ◽  
Cow Milk ◽  
Purification Process ◽  
Croton Tiglium ◽  
Before And After ◽  
Detoxification Process ◽  
Seed Extracts

In Ayurvedic texts, Jayapala or croton tiglium seeds are well known as khumbini for its toxicity (severe purgative action) and are used for the treatment of constipation after shodhana (detoxification) of the seed with godugdha (cow milk). The oil content of the seeds was responsible for the purgative property, and its reduction enhances its medicinal usage. The presence of Crotonoside or iso-guanosine in seed extract was identified in HPTLC and quantified using high pressure liquid chromatography technique both before and after the purification process of the seed. The phytochemicals and physicochemical parameters of seeds were analyzed to find the level of changes in the processed seeds. The other chemical constituents of the seed extracts are studied using different techniques like HPTLC, HPLC, LC-MS, and GC-MS. The study has revealed that the detoxification process, as per classical texts, has shown an effective depletion in the quantity of crotonoside in processed seeds.

Preliminary studies about the role of physicochemical parameters on the organotin compound dynamic in a South American estuary (Bahía Blanca, Argentina)

2019 ◽  
Vol 191 (3) ◽  
Author(s):  
Pamela Y. Quintas ◽  
Eleonora M. Fernández ◽  
Carla V. Spetter ◽  
Andrés H. Arias ◽  
Mariano Garrido ◽  
...  
Keyword(s):  
Physicochemical Parameters ◽  
Organotin Compound ◽  
South American

scholarly journals Role of Design and Operational Factors in the Removal of Pharmaceuticals by Constructed Wetlands

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2356 ◽  
Author(s):  
Huma Ilyas ◽  
Eric van Hullebusch
Keyword(s):  
Constructed Wetlands ◽  
Physicochemical Parameters ◽  
Loading Rate ◽  
Statistical Significance ◽  
High Surface ◽  
Integrated Design ◽  
Aerobic Biodegradation ◽  
Organic Loading Rate ◽  
Operational Factors

This study evaluates the role of design, operational, and physicochemical parameters of constructed wetlands (CWs) in the removal of pharmaceuticals (PhCs). The correlation analysis demonstrates that the performance of CWs is governed by several design and operational factors (area, depth, hydraulic loading rate, organic loading rate, and hydraulic retention time), and physicochemical parameters (dissolved oxygen, temperature, and pH); the removal efficiency of about 50% of the examined PhCs showed a significant correlation with two or more factors. Plants contributed significantly in the removal of some of the PhCs by direct uptake and by enhancing the process of aerobic biodegradation. The use of substrate material of high adsorption capacity, rich in organic matter, and with high surface area enhanced the removal of PhCs by adsorption/sorption processes, which are the major removal mechanisms of some PhCs (codeine, clarithromycin, erythromycin, ofloxacin, oxytetracycline, carbamazepine, and atenolol) in CWs. Although the removal of almost all of the studied PhCs showed seasonal differences, statistical significance was established in the removal of naproxen, salicylic acid, caffeine, and sulfadiazine. The effective PhCs removal requires the integrated design of CWs ensuring the occurrence of biodegradation along with other processes, as well as enabling optimal values of design and operational factors, and physicochemical parameters.

scholarly journals The Impact of Mutations in the HvCPD and HvBRI1 Genes on the Physicochemical Properties of the Membranes from Barley Acclimated to Low/High Temperatures

Cells ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 1125
Author(s):  
Elżbieta Rudolphi-Szydło ◽  
Iwona Sadura ◽  
Maria Filek ◽  
Damian Gruszka ◽  
Anna Janeczko
Keyword(s):  
Fatty Acid ◽  
Physicochemical Parameters ◽  
Fatty Acid Biosynthesis ◽  
Langmuir Monolayers ◽  
Temperature Dependent ◽  
Molar Percentage ◽  
Physiological Processes ◽  
Lipid Fractions ◽  
The Impact

(1) Background: The study characterized barley mutants with brassinosteroid (BR) biosynthesis and signaling disturbances in terms of the physicochemical/structural properties of membranes to enrich the knowledge about the role of brassinosteroids for lipid metabolism and membrane functioning. (2) Methods: The Langmuir method was used to investigate the properties of the physicochemical membranes. Langmuir monolayers were formed from the lipid fractions isolated from the plants growing at 20 °C and then acclimated at 5 °C or 27 °C. The fatty acid composition of the lipids was estimated using gas chromatography. (3) Results: The BR-biosynthesis and BR-signaling mutants of barley were characterized by a temperature-dependent altered molar percentage of fatty acids (from 14:0 to 20:1) in their galactolipid and phospholipid fractions in comparison to wild-type (WT). For example, the mutants had a lower molar percentage of 18:3 in the phospholipid (PL) fraction. The same regularity was observed at 5 °C. It resulted in altered physicochemical parameters of the membranes (Alim, πcoll, Cs−1). (4) Conclusions: BR may be involved in regulating fatty acid biosynthesis or their transport/incorporation into the cell membranes. Mutants had altered physicochemical parameters of their membranes, compared to the WT, which suggests that BR may have a multidirectional impact on the membrane-dependent physiological processes.

Insight into the Role of Physicochemical Parameters in a Novel Series of Amphipathic Peptides for Efficient DNA Delivery

2013 ◽  
Vol 10 (7) ◽  
pp. 2588-2600 ◽  
Author(s):  
Rajpal Sharma ◽  
Shivangi Shivpuri ◽  
Amitesh Anand ◽  
Ankur Kulshreshtha ◽  
Munia Ganguli
Keyword(s):  
Physicochemical Parameters ◽  
Dna Delivery ◽  
Amphipathic Peptides ◽  
Insight Into

scholarly journals Role of Positional Hydrophobicity in the Leishmanicidal Activity of Magainin 2

2004 ◽  
Vol 48 (8) ◽  
pp. 2980-2986 ◽  
Author(s):  
Esther Guerrero ◽  
José María Saugar ◽  
Katsumi Matsuzaki ◽  
Luis Rivas
Keyword(s):  
Antimicrobial Peptides ◽  
Physicochemical Parameters ◽  
Leishmania Donovani ◽  
Classical Concept ◽  
Global Parameter ◽  
Hydrophobic Residues ◽  
Hydrophobic Amino Acids ◽  
Bactericidal Activities ◽  
The Individual

ABSTRACT The emergence of membrane-active antimicrobial peptides as new alternatives against pathogens with multiantibiotic resistance requires the design of better analogues. Among the different physicochemical parameters involved in the optimization of linear antimicrobial peptides, positional hydrophobicity has recently been incorporated. This takes into consideration the concept of the topological distribution of hydrophobic residues throughout the sequence rather than the classical concept of hydrophobicity as a global parameter of the peptide, calculated as the summation of the individual hydrophobicities of the residues. In order to assess the contribution of this parameter to the leishmanicidal mechanisms of magainin 2 analogues, the activities of two of these analogues, MG-H1 (GIKKFLHIIWKFIKAFVGEIMNS) and MG-H2 (IIKKFLHSIWKFGKAFVGEIMNI), which have similar charges, amino acid compositions, and hydrophobicities but different positional hydrophobicities, against Leishmania donovani promastigotes were assayed (T. Tachi, R. F. Epand, R. M. Epand, and K. Matsuzaki, Biochemistry 41:10723-10731, 2002). The activities were compared with that of the parental peptide, F5W-magainin 2 (GIGKWLHSAKKFGKAFVGEIMNS). The three peptides were active at micromolar concentrations, in the order MG-H2 > MG-H1 > F5W-magainin 2. These activities differ from their hemolytic and bactericidal activities. The results demonstrate that positional hydrophobicity, which reflects the presence of short stretches of sequences rich in hydrophobic amino acids, plays an important role in the activities of leishmanicidal peptides.

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