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Erosion risk assessment:A case study of the Langat River bank in Malaysia

International Soil and Water Conservation Research 2017年第1期5卷 26-35页

作者： Roslan Zainal Abidin Mohd Sofiyan Sulaiman naimah yusoff I-Geo Disaster Research Centre Infrastructure University Kuala LumpurJln Ikram-Uniten43000 KajangSelangorMalaysia

River bank erosion is one of the major and unpredictable hazards worldwide including in *** detachment at river banks is due to two processes:1)hydraulic erosion imposed by channel flow and 2)sub aerial erosion due to the weakening and weathering of bank *** paper is focused on the second aspect of the erosion process which mainly depends on the combination of rainfall intensity and the ability of the soil to withstand the raindrop *** relative combination of sand,silt and clay in a soil is argued to have an impact on erosion *** cohesive soil composition,sand forms the largest size ranging from 0.05 to 2 mm whereas silt is adequately moderate(ranging from 0.002 to 0.05 mm)and clay is the smallest of all three(less than 0.002 mm).With the knowledge that soil composition does indeed have an effect on erosion resistance,this paper will attempt to relate risk assessment index of river bank erosion specifically to soil ***,the objectives of this document are as follows;1)to produce risk assessment index for river bank erosion and 2)to carry out a case study for selected rivers in Malaysia pertaining to river bank *** index is produced by inferring the previously developed scale on soil *** researchers created the“ROM”scale(named after the researchers,Rolan and Mazidah)to assess degree of soil erodibility into five classes namely“critical”,“very high”,“high”,“medium”and“low”.Instead of using semi empirical formula from the“ROM”scale,a percentage of soil composition was inferred to produce risk assessment *** was found that as the percentage of clay decreased,susceptibility index became higher and approached a critical *** of the newly developed index is verified by conducting a case study at the Langat River,Kajang,*** soil composition was classified and form fitted into the *** was found that the middle reach of the Langat river is susceptible to severe erosion d

关键词： River bank erosion Percentage occupy Silt content Erodibility Shear stress

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Insights into bacterial resistance to contaminants of emerging concerns and their biodegradation by marine bacteria

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Emerging Contaminants 2024年第3期10卷 260-267页

作者： Hatice Turan Bahia Khalfaoui-Hassani Alisson Godino-Sanchez Zulfatun naimah Mathieu Sebilo Remy Guyoneaud Mathilde Monperrus University of Pau and the Adour Region E2S UPPACNRSIPREM UMR 5254MIRAAngletFrance University of Pau and the Adour Region E2S UPPACNRSIPREM UMR 5254PauFrance Sorbonne Universite CNRSINRAEIRDUPDUPECInstitute of Ecology and Environmental Sciences(IEES)ParisFrance

Contaminants of Emerging Concern(CECs)are human-made chemicals that remain *** continuous detection of CECs in aquatic ecosystems,due to their incomplete removal,emphasizes the importance of understanding their fate and impact on the environment and human *** detrimental effects of CECs on marine eukaryotes are well documented in multiple ***,their impact on marine bacteria and their biodegradation by these organisms are not well *** this study,two marine bacteria,Priestia sp.35 ODPABA G14 and Rhodococcus sp.23 AHTN G14,previously isolated from submarine sediments,were *** two strains were tested for their resistance as well as their capacity to degrade different classes of hydrophobic and hydrophilic CECs,including synthetic musks,UV filters,pesticides and *** strains showed high resistance to all of the hydrophobic tested CECs even up to 500 mg L^(-1).Only Ketoprofen was toxic to bacterial cells,particularly to Rhodococcus *** at concentration as low as 4 mg L^(-1).Furthermore,Priestia *** Rhodococcus *** exhibited high biodegradation potential,especially for hydrophobic *** this may not apply to all pollutants,the data presented in this study suggest a positive correlation between marine bacterial resistance to CECs and their high biodegradation potentials.

关键词： Contaminants of emerging concern Musks UV filters Pharmaceuticals Pesticides Toxicity Biodegradation

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Retting of Musa sapientum Pseudostem with Pectin Decomposting Bacteria

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Journal of Agricultural Science and Technology(B) 2011年第8期1卷 1238-1244页

作者： H. Rasmina M. S. naimah H. Aziah Y. N. Kiew Y. Konami Department of Forest Production Faculty of Forestry Universiti Putra Malaysia UPM Serdang 43400 Selangor Malaysia Department of Human Resource Management and Consumer Studies Faculty of Human Ecology Universiti Putra MalaysiaUPM Serdang 43400 Selangor Malaysia University Soudai Nishiwaseda Building 7F 1-21-1 Nishiwaseda Shinjuku Ward Tokyo Japan

The upper and lower portions of Musa sapientum pseudo-stem sheaths were exposed in four types of treatments： pectin decomposing bacteria, magnesium oxide （MgO）, both pectin decomposing bacteria and MgO and control. The fibre strength properties were tested using SIRIM Standard methods and colour changed using gray scale. The bioaugmentation of pectin decomposing bacteria together with MgO additions were found to enhance retting process and reduced retting periods 52% and yielded better strength on the fibres. The lower portion pseudo-stem sheaths gave the higher strength than upper portion. Colour changed showed that the bioaugmentation of pectin bacteria enhanced the degradation colouring compound in banana fibres.

关键词： Banana pseudo-stem banana fibre retting pectin decomposing bacteria catalyst MgO.

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Housing of Older Persons Living in the Community

Housing of Older Persons Living in the Community

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The 8th Asia/Oceania Regional Congress of Gerontology and Geriatrics

作者： Nurizan Yahaya Tengku Aizan Hamid Chai Sen Tyng Siti Suhailah Abdullah naimah Mohd.Salleh Institute of Gerontology Universiti Putra Malaysia Serdang Selangor Faculty of Human Ecology.Vniversiti Putra Malaysia Serdang

Purpose:The paper aims to study the differences between the older populations living in each type of housing unit and to identify socioeconomic factors that distinguish them.

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Effectiveness of Copepod, <i>Acanthocyclops vernalis</i>on Dengue Fever Victor, <i>Aedes aegypti</i>under Laboratory Conditions in Jeddah, Saudi Arabia

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Open Journal of Ecology 2015年第7期5卷 299-305页

作者： Ahmed M. Alshammari Abdullah S. Alshammari Adel A. Abdelmageed Ashraf A. Mangoud naimah A. Al Anazi Fahad S. Al-Zahrani Department of Biology Faculty of Sciences University of Hail Hail Saudi Arabia Plant Protection Research Institute Giza Egypt Health Prevention and Management and Environment of Disease Vectors Jeddah Saudi Arabia

A. aegypti, the primary carrier for dengue viruses that cause dengue fever and are widespread over large areas of the tropics and subtropics. The copepod, Acanthocyclops vernalis was collected from a pond located in Hail, a city in northwestern Saudi Arabia. A. aegypti colonies established from Laboratory of Public Health Pests, Jeddah Municipality, Jeddah, Saudi Arabia. In the laboratory, the predatory capacity of copepod predator A. vernalis tested on first and second instars of Aedes aegypti. A single adult female of A. vernalis was tested against 50 larvae of A. aegypti in case the presence and absence of an alternative food. Several doses of A. vernalis (10, 15, 20 and 25 adults) against 100 larvae of mosquito were tested also in case the presence and absence of an alternative food under laboratory conditions.

关键词： Copepods Acanthocyclops vernalis Dengue Fever Aedes aegypti Biological Control

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