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RISS 인기검색어
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- 저자 : A. Y. Abdullahi (검색결과 2 건)
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Evaluation of elemental concentrations of uranium, thorium and potassium in top soils from Kuwait
A.D. Bajoga,A.N. Al-Dabbous,A.S. Abdullahi,N.A. Alazemi,Y.D. Bachama,S.O. Alaswad 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.6
Top soil samples across the state of Kuwait numering ninety were collected and analysed using gammarayspectrometry, to evaluate the elemental concentration of 238U, 232Th and 40K and their depletion/enrichment. Results of elemental concentration ranges from 0.48 to 2.61 mg/kg, 0.87e5.23 mg/kg, and0.24e2.23%, with a mean values of 1.39 mg/kg, 3.47 mg/kg, and 1.18%, for the 238U, 232Th and 40K,respectively. Further analysis was conducted amongst the five identified soil types, i.e. Aquisalids (S1),Calcigypsids (S2), Petrocalcids (S3), Petrogypsids (S4), and torripsamment (S5). The highest radioactivityconcentrations from both uranium and thorium were recorded in the S2 (Calcigypsids) soil, with a valueof 1.71 (mg/kg) and 4.45 (mg/kg), respectively. Minimum and maximum values of 40K are 1.1(%) and1.27(%) and is prevalent in Aquisalids (S1) and Petrocalcids (S3) soil types, respectively. Ratios of elementalconcentration for 232Th/238U, 40K/238U, 40K/232Th across the soil types are 2.53, 0.09 and 0.03, with acorrelation coefficient of 0.92, 0.34, and 0.38, respectively. A progressively higher 232Th/238U ratio isobserved moving south-wards, indicating lower 238U content in soils from the south relative to thenorthern part. Overall results indicate Kuwait to be relatively an area with low level of naturalradioactivity.
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Sequence Analysis of Mitochondrial Genome of Toxascaris leonina from a South China Tiger
Kangxin Li,Fang Yang,A. Y. Abdullahi,Meiran Song,Xianli Shi,Minwei Wang,Yeqi Fu,Weida Pan,Fang Shan,Wu Chen,Guoqing Li 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.6
Toxascaris leonina is a common parasitic nematode of wild mammals and has significant impacts on the protection of rare wild animals. To analyze population genetic characteristics of T. leonina from South China tiger, its mitochondrial (mt) genome was sequenced. Its complete circular mt genome was 14,277 bp in length, including 12 protein-coding genes, 22 tRNA genes, 2 rRNA genes, and 2 non-coding regions. The nucleotide composition was biased toward A and T. The most common start codon and stop codon were TTG and TAG, and 4 genes ended with an incomplete stop codon. There were 13 intergenic regions ranging 1 to 10 bp in size. Phylogenetically, T. leonina from a South China tiger was close to canine T. leonina. This study reports for the first time a complete mt genome sequence of T. leonina from the South China tiger, and provides a scientific basis for studying the genetic diversity of nematodes between different hosts.
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