scholarly journals Measurement of concentrations of the natural radio-activities and Cs-137 in soil samples in the Al-Baha region of Saudi Arabia

2011 ◽  
Author(s):  
A. A. Al-Zahrany ◽  
K. S. Al-Mogabes
Keyword(s):  
Saudi Arabia ◽  
Soil Samples

scholarly journals Active Antibiotics Production by Actinomycetes Indigenous To Saudi Arabia Soils

2021 ◽  
Vol 11 (6) ◽  
pp. 20-29
Author(s):  
Fetoon M ◽  
helaiwi Alk ◽  
Ismet Ara ◽  
Nadine Moubayed
Keyword(s):  
Saudi Arabia ◽  
Biochemical Properties ◽  
Soil Samples ◽  
Fungal Strain ◽  
Pathogenic Microorganisms ◽  
Bacterial Strains ◽  
Desert Soils ◽  
Growth Environment ◽  
Physiological And Biochemical ◽  
Physiological And Biochemical Properties

Streptomyces are the most popular among the Actinomycetes groups and found in soils worldwide. They form an important part of the soil ecology within the Actinomycetales order. Streptomyces are diverse as secondary antibiotic metabolites such as Novobiocin, Amphotericin, Vancomycin, Neomycin, Gentamicin, Chloramphenicol, Tetracycline, Erythromycin and Nystatin. Thus, the current study was aimed to isolate, identify and assess the active antibiotic metabolites produced by different actinomyces sp. found in Saudi Arabian soils. Six samples were collected from desert soils of the Al Thumamah area and analyzed using GS-MS. Scanning Electron Microscopy was used to identify the bacterial strains along with their antibiotic metabolites effectiveness of secondary metabolites (antibiotics) against different Gram-positive (Bacillus subtilis, Staphylococcus aureus), negative pathogens (Pseudomonas aeruginosa, Escherichia coli, Salmonella suis, and Shigella sonnei) as well as the fungal strain Candida albicans was investigated. Thirty active bacterial (F1-30) strains were isolated from the soil samples and the strains F3, F7, F22, F30 have white, gray, pink, yellow and red colours respectively. Only ten strains (F13, F14, F15, F16, FI7, F18, F19, F20, F21, and F22) were found to have antimicrobial activity against at least one pathogen. The optimum growth environment was pH 4-10, temperature (300C), and NaCl (7% w/v) concentration. According to our findings, the extreme desert environment of Al Thumamah from Saudi Arabia is rich in its actinobacterial population with diverse colouring groups and various physiological and biochemical properties. This shows it’s capability of generating secondary metabolite elements that could inhibit pathogenic microorganisms.

226Ra AND 228Ra CONCENTRATIONS IN SOILS WITH INTENSE GROUNDWATER IRRIGATION IN AN ARID ENVIRONMENT

2019 ◽  
Vol 188 (3) ◽  
pp. 299-310 ◽  
Author(s):  
Y Y Ebaid
Keyword(s):  
Saudi Arabia ◽  
Annual Effective Dose ◽  
Arid Environment ◽  
Soil Samples ◽  
Agricultural Activities ◽  
Radium Isotopes ◽  
Enhancing Effect ◽  
Groundwater Irrigation ◽  
Long Time ◽  
Work Samples

Abstract The enhancing effect due to long-time irrigation with radium-containing groundwater on soil was investigated in this work. Samples from the Al-Qassim and Hail areas in Saudi Arabia were studied for their 226Ra and 228Ra inventories. Groundwater and soil samples were collected from 32 farms where agricultural activities are intensively irrigated with radium-containing groundwater. A noticeably good correlation was observed between radium isotopes inventories in the groundwater used for irrigation with those in the associated soils. It was concluded that there are enhanced levels of radium isotopes in the soils due to the existence of radium isotopes in irrigated groundwater. The additional annual effective dose values ranged between 0.00 and 0.412 with an average of 0.09 mSv y−1.

Fantastic yeasts and where to find them: the discovery of a predominantly clonal Cryptococcus deneoformans population in Saudi Arabian soils

2019 ◽  
Vol 95 (9) ◽  
Author(s):  
Himeshi Samarasinghe ◽  
Renad Aljohani ◽  
Carlene Jimenez ◽  
Jianping Xu
Keyword(s):  
Saudi Arabia ◽  
Middle East ◽  
Multilocus Sequence Typing ◽  
Ecological Niche ◽  
Saudi Arabian ◽  
Soil Samples ◽  
Recombinant Product ◽  
Desert Climate ◽  
Sequence Types ◽  
Major Sequence

ABSTRACT Cryptococcus deneoformans is an opportunist yeast pathogen and causative agent of meningoencephalitis in humans. It is known to be mainly distributed in temperate climates. Most of our current understanding of this species has come from clinical isolates, leaving environmental populations largely unexplored. The Middle East remains one such underexplored area with no published study to date investigating cryptococcal diversity in soil. In this study, we identified 76 C. deneoformans isolates from a survey of 562 soil samples collected from six cities in Saudi Arabia. Multilocus sequence typing revealed the presence of two major sequence types (STs), ST160 (n = 63) and ST294 (n = 9), along with four singleton STs, three of which were novel. One novel ST, ST613, was likely a recombinant product between ST160 and ST294. Among the 76 isolates, 75 belonged to mating type (MAT)α while one isolate was MATa. Our analyses suggest that the Saudi Arabian C. deneoformans population likely reproduces both asexually and sexually in nature. Our study is the first to report the occurrence of C. deneoformans in a desert climate, representing a novel expansion to this species’ currently known ecological niche.

scholarly journals Newley Isolated Bacilli from the Saline Soil of the Halophytic Plant Halopeplis Perfoliata Community.

2020 ◽  
pp. 1-2
Keyword(s):  
Saudi Arabia ◽  
16S Rrna ◽  
Bacillus Amyloliquefaciens ◽  
Genomic Dna ◽  
Saline Soil ◽  
Soil Samples ◽  
Nutrient Agar ◽  
Biotechnological Applications ◽  
Halophytic Plant ◽  
Human Use

Abstract Exploring bacterial existence in environments such as soils represents a major opportunity to understand their roles in such environments, which helps in utilizing these magnificent organisms in the different applications of human use. In the present study, samples were collected from the soils of Halopeplis perfoliata community at the coastal line of Jeddah, Saudi Arabia. The bacterial stains were isolated from the soil samples on nutrient agar with the addition of NaCl. Genomic DNA was processed to identify these bacteria by 16s rRNA approach. As a result of this study, four types of bacteria have been identified; Bacillus amyloliquefaciens, B. halotolerans, B. subtilis, and Ammoniphilus sp. These bacteria are significant beneficial for biotechnological applications.

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