Natural Radioactivity Assessment and Radiological Hazards in Soils from Qarun Lake and Wadi El Rayan in Faiyum, Egypt

M., Darwish Saher; M., El-Bahi Samia; T., Sroor Amany; F., Arhoma Najat

doi:10.4236/ojss.2013.37034

Cited by 11 publications

(1 citation statement)

References 25 publications

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“…The isolate Q1 had morphological features and rRNA gene homology similar to that of Persinema komarekii, a species, which commonly occurs in the highly radiated aquatic area (Heidari et al 2018). However, some areas of Lake Qarun are characterized by the existence of radioactive 40 K due to excessive discharge of K-containing fertilizers, from agricultural drains into the lake (Imam 2005;Darwish et al 2013;Amin 2015). These environmental conditions may favor the occurrence of Persinema-like isolate Q1.…”

Section: Discussionmentioning

confidence: 99%

Characterization of cyanobacterial isolates from freshwater and saline subtropical desert lakes

et al. 2022

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Characterization of Cyanobacteria in lakes with different physicochemical properties provides insights into the diversity of this phylum and knowledge of their features that are relevant to biotechnology applications. Six Cyanobacterial isolates were recovered from freshwater Lake Nasser and saline Lake Qarun, Egypt. The isolates were identified based on both morphology and molecular markers, 16S rRNA, and RuBisCO cbbL genes. The isolates SN1, SN2, SN3, SN4, Q1, and Q2 showed homologies with Merismopedia, Oscillatoria, Limnothrix, Persinema, and Jacksonvillea, respectively. The cbbL sequences for isolates SN1, Q1, and Q2 represented the first records for candidates relating to the genera Merismopedia and Persinema, and Jacksonvillea, respectively. Biochemical contents, carbohydrates, proteins, lipids, pigments, and ash-free dry weight were measured for each isolate. Isolate SN2 had the highest content of allophycocyanin, 71 ± 4.8 mg/g DW, and phycoerythrin, 98 ± 6.7 mg/g DW, while the isolate SN4 had the highest composition of total protein, lipid, carotenoid, and chlorophyll a, recording 364.7 ± 6.4 mg/g DW, 67.6 ± 0.2 mg/g DW, 0.261 ± 0.01 mg/g DW, and 10 ± 0.6 mg/g DW, respectively. Isolate Q1 recorded the maximum amount of phycocyanin, 114 ± 20.7 mg/g DW among isolates. The isolate Q2 was observed to have the highest carbohydrate content, 274 ± 14.5 (mg/g DW), and ash-free dry weight, 891.8 ± 2.8 mg/g DW. Thus, the study indicated that the current isolates may represent promising resources for biotechnological applications.

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Section: Discussionmentioning

confidence: 99%

Characterization of cyanobacterial isolates from freshwater and saline subtropical desert lakes

et al. 2022

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Optimization of Cellulase Production by Halobacillus sp. QLS 31 Isolated from Lake Qarun, Egypt

Korany

Ali

Essam

et al. 2017

Appl Biochem Biotechnol

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A halophilic cellulase-producing bacterium was isolated from a sediment sample collected from Lake Qarun (Fayoum Province, Egypt). Molecular identification based on 16S rDNA amplification and sequencing revealed 99% homology with Halobacillus sp. and hence was designated as Halobacillus sp. QLS 31. Medium composition and culture conditions were optimized for enhancing the production of cellulase enzyme using the Plackett-Burman statistical design. Ten variables were evaluated for their influence on cellulase production. Carboxymethyl cellulose (CMC), zinc sulfate (ZnSO), and inoculum size were found to exert a significant effect on cellulase productivity by Halobacillus sp. QLS 31. The maximum specific activity of cellulase enzyme was 48.08 U/mg. Following the predicted conditions, a 7.5-fold increase in cellulase specific activity (175.47 U/mg) was achieved compared to the basal medium (23.19 U/mg) under the following optimized conditions: temperature (30 °C), fermentation time (2 days ), pH value (9), CMC concentration (1%), inoculum size (1%), yeast extract concentration (0.1%), ammonium sulfate ((NH)SO) concentration (0.1%), sodium chloride (NaCl) concentration (20%), and metal inducers: ZnSO (0.1%) and Ca/Mg ratio (0.01%). Thus, the results of this study provide an important basis for more efficient, cheap industrial cellulase production from halophilic Halobacillus sp. QLS 31.

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Evaluation of radiological hazards due to natural radioactivity in soil samples collected in and around some gold mining areas of the Mayo-Kebbi region in Chad with statistical analyses

Samafou,

Daniel,

Alexandre

et al. 2023

Arab J Geosci

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Natural Radioactivity Assessment and Radiological Hazards in Soils from Qarun Lake and Wadi El Rayan in Faiyum, Egypt

Cited by 11 publications

References 25 publications

Characterization of cyanobacterial isolates from freshwater and saline subtropical desert lakes

Characterization of cyanobacterial isolates from freshwater and saline subtropical desert lakes

Optimization of Cellulase Production by Halobacillus sp. QLS 31 Isolated from Lake Qarun, Egypt

Evaluation of radiological hazards due to natural radioactivity in soil samples collected in and around some gold mining areas of the Mayo-Kebbi region in Chad with statistical analyses

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