scholarly journals Rapid Quantitative Estimation of Chlorinated Methane Utilizing Bacteria in Drinking Water and the Effect of Nanosilver on Biodegradation of the Trichloromethane in the Environment

2015 ◽  
Vol 8 (3) ◽  
Author(s):  
Isaac Zamani ◽  
Majid Bouzari ◽  
Giti Emtiazi ◽  
Maryam Fanaei
Keyword(s):  
Drinking Water ◽  
Quantitative Estimation ◽  
Chlorinated Methane

scholarly journals EXPERIMENTAL HYGIENIC ESTIMATION OF CALCIUM AND MAGNESIUM CONCENTRATIONS IN DRINKING WATER, AND ITS HARDNESS

2019 ◽  
Vol 98 (8) ◽  
pp. 811-819
Author(s):  
E. M. Trofimovich ◽  
S. A. Nedovesova ◽  
Roman I. Aizman
Keyword(s):  
Drinking Water ◽  
Thyroid Hormones ◽  
Quantitative Estimation ◽  
Experimental Studies ◽  
Water Hardness ◽  
Blood Parameters ◽  
Plasma Metabolites ◽  
Total Hardness ◽  
Calcium And Magnesium ◽  
Plasma Magnesium

Introduction. The lack of hygienic norms for Mg2+ and Ca2+ in drinking water and the wide ranges of acceptable hygienic norms (AHN) of these cations in water packaged in containers determine the relevance of experimental studies on the substantiation of AHN of Mg2+, Ca2+ and the hardness of drinking water with a centralized water supply to the population. Material and methods. Chronic experiments were performed on 5 groups of adult Wistar rats (n = 50): control animals received drinking water (Ca2+ 20.0; Mg2+ 6.0 mg / dm3, hardness 1.5-1.8 mEq/dm3); four other groups received model drinking water with different contents of Ca2+ (50, 80, 100 and 140 mg/dm3) and Mg2+ (20, 40, 55 and 85 mg/dm3) by adding CaCl2 or MgSO4 salts to the control water. The effect of these drinking water samples on kidney function, ion osmotic blood parameters, plasma metabolites of lipid and protein metabolism, as well as the concentration of thyroid hormones (T3 and T4) and cortisol were studied. Results. Prolonged action of increased concentrations of Ca2+ and Mg2+ on the organism was established to cause alterations in fat metabolism, the adaptive activation of osmoregulatory and ion regulatory kidney functions, increasing the concentration of thyroid hormones and a decrease of cortisol titer in plasma. Magnesium led to more pronounced changes in water-salt metabolism, and at a concentration of 85.0 mg/dm3 (7.0 mg-Eq/dm3) - to depletion of secretion of the described hormones. Conclusion. Based on the obtained results, individual ranges for AHN of calcium and magnesium concentrations in water were recommended. The upper limit of AHN of drinking water total hardness is of 7.0 mg-Eq/dm3 at the joint presence of Ca2+and Mg2+. The rule of hygienic qualitative and quantitative estimation of calcium and magnesium types of drinking water hardness is formulated.

The development of species-specific probes for a quantitative estimation of non-cultured bacteria in groundwater samples

2012 ◽  
Vol 12 (2) ◽  
pp. 212-219
Author(s):  
Annemieke Ultee ◽  
Ines Hahn ◽  
Stephanie Schwarz ◽  
Helmut König
Keyword(s):  
Drinking Water ◽  
Quantitative Estimation ◽  
Bacterial Species ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Water Production ◽  
Groundwater Samples ◽  
Production Wells ◽  
Species Specific

The aim of this study was to quantify different bacteria in drinking water production wells that supply the city of Mainz (capital of Rhineland-Palatinate, Germany). Knowledge of the counts of individual microorganisms is important for the appraisal of the hygienic and sensory quality of drinking water. Specific 16S rRNA probes were designed for 14 previously identified but non-cultured bacterial species (Ferribacterium limneticum, Hydrogenophaga sp., Methylotenera sp., Janthinobacterium sp., Pseudomonas sp., Rhizobium selenireducens, Rhodoferax sp., Nitrosomonadaceae bacterium, Thauera sp. and five strains which could not be identified to species level). With fluorescence in situ hybridization the titer of these species was determined. Total bacterial counts were 4.3 × 104 cells/mL (April) and 4.0 × 104cells/mL (December). The highest relative counts were observed for Methylotenera sp. (4.6–21.7%), F. limneticum (6.1–10.2%), Janthinobacterium sp. (6.1–7.1%), strain K-S10-Sep02 (5.8–5.9%) and Nitrosomonadaceae bacterium (4.8–5.9%). These organisms accounted for 50% (April) and 29% (December) of the total counts. Finally, single water production wells that supply drinking water were studied for the counts of Methylotenera sp., F. limneticum and Janthinobacterium sp. These counts differed between the wells and did not reflect counts in the drinking water treatment plant.

Habitat Association of Klebsiella Species

1985 ◽  
Vol 6 (2) ◽  
pp. 52-58 ◽  
Author(s):  
Susan T. Bagley
Keyword(s):  
Drinking Water ◽  
Gastrointestinal Tract ◽  
Surface Waters ◽  
Industrial Effluents ◽  
Opportunistic Pathogen ◽  
Habitat Associations ◽  
Habitat Association ◽  
Klebsiella Species ◽  
Almost All ◽  
Polluted Waters

AbstractThe genus Klebsiella is seemingly ubiquitous in terms of its habitat associations. Klebsiella is a common opportunistic pathogen for humans and other animals, as well as being resident or transient flora (particularly in the gastrointestinal tract). Other habitats include sewage, drinking water, soils, surface waters, industrial effluents, and vegetation. Until recently, almost all these Klebsiella have been identified as one species, ie, K. pneumoniae. However, phenotypic and genotypic studies have shown that “K. pneumoniae” actually consists of at least four species, all with distinct characteristics and habitats. General habitat associations of Klebsiella species are as follows: K. pneumoniae—humans, animals, sewage, and polluted waters and soils; K. oxytoca—frequent association with most habitats; K. terrigena— unpolluted surface waters and soils, drinking water, and vegetation; K. planticola—sewage, polluted surface waters, soils, and vegetation; and K. ozaenae/K. rhinoscleromatis—infrequently detected (primarily with humans).

Letters. Drinking water contaminants.

1983 ◽  
Vol 17 (9) ◽  
pp. 394-394 ◽  
Author(s):  
JGMM Smeenk
Keyword(s):  
Drinking Water ◽  
Water Contaminants
Sign in / Sign up

Export Citation Format

Share Document