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Water and sediment oil content spread in Dumai coastal waters, Riau Province, Indonesia

Egyptian Journal of Aquatic Research 2016年第4期42卷 411-416页

作者： Ariani, Fitri Effendi, Hefni Suprihatin Graduate Program of Natural Resources and Environmental Management Bogor Agricultural University (IPB) Indonesia Center for Environmental Research Bogor Agricultural University (IPB) Indonesia Department of Agro-Industrial Technology Bogor Agricultural University (IPB) Indonesia

Dumai coastal water is one of coastal area that very active in Indonesia, since it has national and international shipping lanes. Furthermore along coastal waters of Dumai are locate various industries likely influencing coastal environmental water quality. The study aimed to examine oil content in water and bottom sediment. The highest oil content in water was found at Lubuk Gaung station 11 (0.719 ppm), western part of the research location. This might be related to the monsoon season change in which sea water current changes toward west direction during April–May 2015. Sediment oil content at Purnama station 4 (3591 ppm) was the highest. It might be attributed to the existence of industries along the coast. The high oil concentration in sediment might affect coastal ecosystems. © 2016 National Institute of Oceanography and Fisheries

关键词： Anthropogenic Dumai Environment Oil Sediment Water

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Potential anti-biofilm producing marine actinomycetes isolated from sea sediments in Thailand

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Agriculture and natural resources 2018年第3期52卷 228-233页

作者： Leetanasaksakul, Kantinan Thamchaipenet, Arinthip Department of Genetics Faculty of Science Kasetsart University Bangkok 10900 Thailand Interdisciplinary Graduate Program in Genetic Engineering Graduate School Kasetsart University Bangkok 10900 Thailand Center for Advanced Studies in Tropical Natural Resources Kasetsart University Bangkok 10900 Thailand

Marine actinomycetes are well known as novel resources of bioactive compounds including anti-biofilm agents with various therapeutic applications. In this study, one hundred and one marine actinomycetes were isolated from sea sediments collected from Andaman sea and the Gulf of Thailand. Morphological study and partial 16S rDNA sequence analysis revealed that most of isolates belong to genus Streptomyces (n = 90, 89.11%) and the rest are rare actinomycetes (n = 11, 10.89%) including Actinopolymorpha, Actinomycetospora, Dietzia Nocardiopsis, Micromonospora and Mycobacterium. Among them, ten and thirteen strains significantly reduced more than 60% of biofilm formation of Escherichia coli and Staphylococcus aureus, respectively. But no such activity was found against Pseudomonas aeruginosa. Further analysis of their supernatants indicated that most of marine actinomycetes secreted non-toxic anti-biofilm agents and some accompanied with protease activity. These are preferred characteristics of anti-biofilm substances that potentially restricted biofilm forming of E. coli and S. aureus and simultaneously prevented bacteria to develop resistance. © 2018 Kasetsart University

关键词： Anti-biofilm Marine actinomycetes

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Analysis of marine debris at Alue Naga and Ulee Lheue beaches in Banda Aceh City using the transect method

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Materials Today: Proceedings 2022年 63卷 S339-S345页

作者： Windari, Wulan Saiful, Saiful Gani, Asri Mahidin Master of Environment Management Postgraduate Program Syiah Kuala University Banda Aceh Indonesia Chemistry Department Faculty of Mathematics and Natural Science Syiah Kuala University Banda Aceh Indonesia Chemical Engineering Faculty of Engineering Syiah Kuala University Banda Aceh Indonesia Research Center for Environmental and Natural Resources Universitas Syiah Kuala Darussalam Banda Aceh 23111 Indonesia

Alue Naga Beach and Ulee Lheue Beach are beaches located in Banda Aceh City, Aceh Province, these two beaches have a fairly large role in the fields of fisheries, transportation, and tourism. During the last few years, the population growth rate of Banda Aceh City has increased by 2% per year, this causes the volume of waste generated to be even greater, unfortunately, the municipal waste management office cannot manage it fully. Most of the untreated waste enters water bodies and has the potential to pollute the marine and coastal environment. So it is necessary to do research to provide an overview of the level of marine debris pollution on the two beaches. This study uses the transect method, the waste obtained is grouped according to size and type. The results showed that marine debris on Ulee Lheue beach was found to be more numerous and varied than marine debris on Alue Naga beach. Overall, macro waste with a size range of 2.5−1 m was the most commonly found and plastic was the waste with the highest yield with a density value of 65.8 g/m2, an abundance of 6.56 items/m2, and a percentage of 75%. © 2022

关键词： Beaches

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Artificial neural networks for the prediction of channel geomorphic condition and stream sensitivity

Artificial neural networks for the prediction of channel geo...

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作者： Besaw, Lance Rizzo, Donna M. Kline, Michael University of Vermont College of Engineering and Mathematical Sciences Burlington VT 05405 United States Vermont Agency of Natural Resources River Management Program Waterbury VT 05671 United States

ISBN: (纸本)9780784409275

Stream channel and watershed management requires an interdisciplinary approach by multiple stakeholders with often disparate goals and objectives. Even single management goals (e.g. mitigation of property loss due to stream bank erosion and flooding, restoring stream channels and aquatic species habitat) require solutions that span multiple spatial and temporal scales. To deal with the complexity associated with goals such as reducing fluvial erosion hazards, sediment and nutrient loading and threats to aquatic habitat associated with geomorphic instability, the Vermont Agency of natural resources' River management program has been developing and testing 1) protocols for conducting field-based and remote sensing data and 2) a geographical information system (GIS)-based tool since 1999. These protocols and tools facilitate an understanding of channel instability and assist in developing strategies at appropriate scales to restore channel equilibrium. A hierarchical system of data-driven artificial neural networks (ANNs) has been developed to enhance these existing GIS-based watershed management tools for predicting channel geomorphic condition and inherent sensitivity at the reach scale. We research and develop these ANNs as an alternative model that can incorporate large amounts of data for use in the operational management of watersheds. The ANNs have been trained and tested on remotely sensed and in-field data along with corresponding expert opinions of geomorphic condition and sensitivity. The focus is performing sensitivity analyses and addressing inadequacies associated with assimilation activities that are closely tied to large amounts of hydrological-relevant remote sensing and field data. © 2007 ASCE.

关键词： Watersheds

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Role of Lactobacillus sakei strain pro7 to reduce dichloro diphenyl trichloroethane level 1

Role of Lactobacillus sakei strain pro7 to reduce dichloro d...

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1st SEMIRATA-International Conference on Science and Technology, SEMIRATA-ICST 2018

作者： Nasution, L. Bakti, D. Agusnar, H. Harahap, E.M. Post Graduate of Natural Resources and Environment Management Program School of Post-Graduate University of Sumatera Utara Indonesia Department of Agrotechnology Faculty of Agriculture University of Sumatera Utara Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences University of Sumatera Utara Indonesia Department of Soil Science Faculty of Agriculture University of Sumatera Utara Indonesia

Several species of bacteria can be utilized to degrade the residual insecticides. One of them was chosen from the genus Lactobacillus. The purposes of soils in Merdeka Village, Karo Regency, North Sumatra, Indonesia as well as to investigate bacteria which is capable of surviving in DDT-contaminated soil. Method for the residual analysis of the soil utilizes Quechers tube, and the bacterial propagation were performed in the medium mineral 4 (MM4). Purification to bacterial isolates was carried out in the Plate Count Agar (PCA) medium and subsequently followed by morphological identification. The results of this study show that the soil were contaminated by O'P'-DDT ranging from 2.2 μgKg-1 to 9.0 μgKg-1. Phylogenetic analysis proves that the Lactobacillus sakei Strain PRO7 bacteria was identified. The growth rate of DDT biodegradation by Lactobacillus sakei Strain PRO7 bacteria is noted the highest at 7.89 observation and reaches 95.1% of biodegradation percentage at the 20 ppm DDT concentration. © Published under licence by IOP Publishing Ltd.

关键词： Bacteria

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Follow-up of environmental impacts upon water sources of São Carlos, Brazil 14

Follow-up of environmental impacts upon water sources of Sã...

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14th International Conference on Computers in Urban Planning and Urban management, CUPUM 2015

作者： Costa, Carlos Wilmer Dupas, Francisco Antônio Lorandi, Reinaldo Oliveira, Erica Zanardo Graduate Program in Environmental Sciences Environmental Sciences Department Federal University of São Carlos São Carlos São Paulo Brazil Graduate Program in Energy Natural Resources of Institute Federal University of Itajubá Minas Gerais Brazil Graduate Program in Urban Engineering Civil Engineering Department Federal University of São Carlos São Carlos São Paulo Brazil

ISBN: (纸本)9780692474341

An understanding of the interrelationship between the characteristics of natural and manmade environments is essential to avoid heavy economic and social burdens on society resulting from environmental deterioration. Irreversible human changes can be avoided using land use models, which can examine the impacts of alternative land use regulations and future urbanization on the environment Much of the population of mediumsized Brazilian cities is concentrated in densely populated urban areas. In this context, the use of Geographical Information Systems have a great value for land management, allowing the diagnosis and characterization of the areas that have suffered the consequences of land use for urban development and helping in the proposition of alternatives to minimize the generated impacts. In this paper, a simple spatially explicit model was used to explore potential areas for urban expansion in São Carlos city, Brazil. Orbital images of the satellite ALOS sensor AVNIR-2 were used to diagnose the urban area of the city and a comparison is made with the Master Plan. This way, Municipal Zone management, urban sprawl, topography, geology, hydrography, pedology, infrastructure and land use were analyzed in an integrated way, each of them serving as the "background" to the other. This analysis has drawn criticisms and considerations for further alternatives. Another approach of interest refers to the expansion of the urban sprawl on the watershed of Feijão Rivers. The basin is the main source of surface water supply to the city of São Carlos, and is an important recharge area of the Guarani Aquifer System (GAS), therefore, they shall be preserved to serve as future water reserves.

关键词： Land use

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Restoring complex vegetation in urban settings: The case of tidal freshwater marshes

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Urban Ecosystems 2004年第2期7卷 125-137页

作者： Baldwin, Andrew H. Natural Resources Management Program Department of Biological Resources Engineering 1423 Animal Science Building University of Maryland College Park USA.

Tidal freshwater marshes have diverse plant communities that vary spatially and temporally due to hydrology, animal activity, and other factors. Development of urban centers along rivers of the U.S. Atlantic coast has reduced the historic extent and quality of these and other coastal wetlands. Because the vegetation of these wetlands is more complex than that of salt and brackish marshes (where restoration of vegetation typical of natural systems has sometimes been successful), restoration of tidal freshwater marsh vegetation is likely to be more difficult, particularly in urban areas. Watershed urbanization alters hydrology, sediment load, propagule availability and composition, nutrient status, and other variables that together create an environment different from that of wetlands in less developed areas, possibly precluding restoration of typical marsh vegetation. Tidal freshwater wetlands were historically extensive along the Anacostia River in Washington, DC, but most of these were lost due to filling, dredging, or hydrologic alteration. Over the last decade, the U.S. Army Corps of Engineers has implemented projects designed to restore tidal freshwater wetlands along the Anacostia, which involved increasing elevation with dredged river sediment and planting native vegetation. To illustrate some of the mechanisms affecting vegetation development in restored tidal freshwater marshes in urban areas, I present a case study on one of these wetlands, Kingman Marsh, that also includes research at another restored wetland and two natural reference sites. Studies by my research groups indicate that the restored wetlands undergo essentially a planting-modified process of primary succession. Low densities of seeds are initially present in the substrate, and prolific seed dispersal into the restored sites results in high initial plant diversity comprised of plantings and ruderal (i.e. weedy) natives and exotics. Seed banks develop rapidly at the restored sites, probably du

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Internet software programs aid in search for Amazonian geoglyphs

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Eos, Transactions American Geophysical Union 2007年第21期88卷 226-229页

作者： Alceu Ranzi Robert Feres Foster Brown Laboratory of Paleontology and Graduate Program in Ecology and Natural Resource Management Federal University of AcreRio Branco Brazil Graduate Program in Ecology and Natural Resource Management and Civil Engineering Department Federal University of Acre Graduate Program in Ecology and Natural Resource Management Federal University of Acre and Woods Hole Research Center Woods Hole Mass.

The Web-based Google Earth software program recently has incorporated high-resolution satellite imagery that facilitates the search for landscape expressions of past civilizations that we call geoglyphs. Since 2000, about 40 such geoglyphs have been observed in overflights above recently deforested pastures of southwestern Amazonia in eastern Acre State, Brazil [ Ranzi and Aguiar , 2001; Ranzi , 2003; Ranzi and Aguiar , 2004]. These geoglyphs typically are circular or rectangular, on the scale of 100 meters or more, with bordering trenches 1–3 meters deep (Figure l). Carbon-14 dating of charcoal associated with these geoglyphs indicates ages between 2500 and 1000 years B.P [ Latini , 1998; Pärssinen et al. , 2003].

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Broadband absorptance high efficiency silicon nanowire fractal arrays for photovoltaic applications

Broadband absorptance high efficiency silicon nanowire fract...

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2014 MRS Spring Meeting

作者： Alzoubi, Omar H. Abu-Safe, Husam Alshurman, Khalid Naseem, Hameed A. Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States Natural Resources Engineering and Management German-Jordanian University Madaba Jordan Microelectronics and Photonics Program University of Arkansas FayettevilleAR72701 United States

Nanowire arrays have been proposed to enhance light trapping, increase efficiencies, and reduced material cost in photovoltaic solar cells. In this work we present a new crystalline silicon nanowire array structure, inspired by fractal geometry. The array structure is assumed to be an infinite 2D array in the x and y directions, and composed of vertically aligned SiNW suspended in air. Hexagonal fractal-like geometry is adapted in arranging cylindrical SiNW in these arrays. Full-wave finite element method 3D simulation is used to compute reflectance, transmittance and absorptance of the array for a normal incidence plane wave. The proposed fractal-like distribution of SiNW arrays yield broad absorption spectrum and enhanced efficiency while using less material. The efficiency of the proposed fractal-like SiNW arrays achieve ∼100% enhancement over that of the equivalent thickness flat c-Si film, and ∼18% enhancement over an equivalent height hexagonal array. The proposed optimized structures achieved a filling ratio ∼25%, which is ∼33% less than the corresponding hexagonal array. Copyright © 2014 Materials Research Society.

关键词： Silicon compounds

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Interdisciplinary graduate education in water and environmental resources in 2050

Interdisciplinary graduate education in water and environmen...

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World Environmental and Water resources Congress 2010: Challenges of Change

作者： Saito, Laurel Fiedler, Fritz Cosens, Barbara Kauneckis, Derek Department of Natural Resources and Environmental Science Graduate Program of Hydrologic Sciences University of Nevada Reno NV United States Department of Civil Engineering Waters of the West Graduate Program University of Idaho United States College of Law Waters of the West Program University of Idaho United States Department of Political Science University of Nevada Reno NV United States

ISBN: (纸本)9780784411148

The science and management of environmental- and water-related issues requires an interdisciplinary approach, as recognized by funding agencies, consulting firms, and public organizations. In their role of preparing students for productive professional careers, academic institutions should be able to train students in interdisciplinary approaches, but complications exist in current academic environments that make interdisciplinary education especially challenging. We provide a vision of interdisciplinary graduate education in water and environmental resources in 2050 after presenting a brief assessment of current issues in interdisciplinary education. © 2010 ASCE.

关键词： Water resources

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