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Synergistic effect of silicon availability and salinity on metal adsorption in a common estuarine diatom

Journal of Environmental Sciences 2025年第2期148卷 364-374页

作者： Fengyuan Chen Jie Ma Ke Pan SZU-HKUST Joint PhD Program in Marine Environmental Science Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Marine Microbiome Engineering Institute for Advanced StudyShenzhen UniversityShenzhen 518060China Department of Ocean Science The Hong Kong University of Science and TechnologyHong Kong 999077China

Increasing nitrogen and phosphorus discharge and decreasing sediment input have made silicon(Si)a limiting element for diatoms in *** in nutrient structure and salinity fluctuation can greatly affect metal uptake by estuarine ***,the combined effects of Si and salinity on metal accumulation in these diatoms have not been *** this study,we aimed to investigate how salinity and Si availability combine to influence the adsorption of metals by a widely distributed diatom Phaeodactylum *** data indicate that replete Si and low salinity in seawater can enhance cadmium and copper adsorption onto the diatom *** the single-cell level,surface potential was a dominant factor determining metal adsorption,while surface roughness also contributed to the highermetal loading capacity at lower *** a combination of noninvasive micro-test technology,atomic force microscopy,X-ray photoelectron spectroscopy,and Fourier transform infrared spectroscopy,we demonstrate that the diversity and abundance of the functional groups embedded in diatom cell walls vary with salinity and Si *** results in a change in the cell surface potential and transient metal *** study provides novel mechanisms to explain the highly variable metal adsorption capacity of a model estuarine diatom.

关键词： Diatom Metal adsorption Silicon Salinity Functional group Surface potential

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Effects of ambient silicic acid concentration on the physiology of marine cyanobacterial Synechococcus

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Marine Environmental Research 2025年 209卷 107220页

作者： Ou, Qiang Xu, Huo Zhang, Zhen Ma, Jie Pan, Ke Shenzhen Key Laboratory of Marine Microbiome Engineering Institute for Advanced Study Shenzhen University Shenzhen China SZU-HKUST Joint PhD Program in Marine Environmental Science Shenzhen University Shenzhen China Department of Ocean Science The Hong Kong University of Science and Technology Hong Kong

The marine cyanobacterium Synechococcus can accumulate significant amounts of silicon (Si) within its cells, potentially contributing to the vertical transport of biogenic Si in the ocean. This has prompted interest in understanding the uptake, subcellular distribution, and chemical forms of Si in Synechococcus. The surprisingly high intracellular Si concentration could have important impacts on Synechococcus physiology, but these effects have been relatively unexplored. In this study, we investigated the effects of external Si concentrations, [Si(OH)4], on the cell physiology of two strains of Synechococcus (CC9311 and WH7803). Increased ambient [Si(OH)4] significantly enhanced total cellular and water-soluble Si content in Synechococcus, but had little effect on their growth. However, the cell size, volume and photosynthetic performance were significantly reduced in strain WH7803, indicating some harmful effects in the cell. Increases in ambient [Si(OH)4] also altered the Derjaguin-Muller-Toporov (DMT) modulus, adhesion, surface potential and elemental composition of the Synechococcus cells. Notably, significant changes in area-specific adsorbed metals and volume-specific metal content were observed at higher [Si(OH)4] levels, suggesting Si availability in seawater could markedly impact the interactions between Synechococcus cell and environment. Overall, this study provides new insights into the physiological adaptations of marine cyanobacterium Synechococcus to varying environmental silicic acid concentrations. © 2025 Elsevier Ltd

关键词： Psychophysiology

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The ultimate strength characteristics on double hull oil tanker 2

The ultimate strength characteristics on double hull oil tan...

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2nd International Conference of Interdisciplinary Research on Green Environmental Approach for Sustainable Development, ICROEST 2020

作者： Lukman, Arlinda Verawati Juswan Alie, Muhammad Zubair Muis Wulandari, Amalia Ika Department of Ocean Engineering Engineering Faculty Universitas Hasanuddin Makassar Indonesia Naval Engineering Study Program Institut Teknologi Kalimantan Kalimantan Timur Indonesia

A double hull tanker is one of the specific ships where the payload is liquid. The payload is an internal load and gives pressure inside the cargo hold. Besides, the external load like wave act simultaneously on the ship during the voyage. Therefore, the ultimate strength of the ship caused by the internal and external loads must be investigated. The objective of the present study is to investigate the ultimate strength characteristic of double hull oil tankers under hogging and sagging conditions. The cross-section of the double hull tanker is modeled using the finite element method to analyze the ultimate strength. The master node is applied to both sides of the cross-section to know the characteristic of the hull girder under hogging and sagging conditions. One side of the master node is constrained, and the other one is given by rotational force. The analytical method is performed, and the result obtained by the numerical method is then compared, including their characteristic in terms of moment-curvature relationship and deformation. © Published under licence by IOP Publishing Ltd.

关键词： Numerical methods

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One dimensional numerical modeling of point source pollutant distribution in estuarine river basin 7

One dimensional numerical modeling of point source pollutant...

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7th International Conference on Asian and Pacific Coasts, APAC 2013

作者： Achiari, H. Friyadi, D. Pramono, A.W. Paramanandana, B. Ocean Engineering Study Program Institut Teknologi Bandung Jl. Ganesa No. 10 Bandung40132 Indonesia

ISBN: (纸本)9789795301257

Pollutant is product that produced from every activities, both natural and human-made. In many case, mostly, pollutant brings a negative effect to the environment. It comes to the environment in many ways. This paper would be modelled a point source pollution in river in one dimensional numerical modelling to orient hydrological model by using explicit and implicit scheme. In the end, the concentration and spreadness in the river would be known. It would be modelled in three case condition which is has the same initial and boundary condition. Those cases give a different value of velocity of river and reaction term per day. The point source pollution located one of third of the river length. From the general form of the convective diffusion, this numerical modelling neglected the area because it assumed that the area is *** determine the constant of α, β, γ variables can be simplified in to the matrixsimultaneous equations. The output gives the graph time and concentration. This paper brings the similar result between hypothesis and the numerical modelling. © APAC *** rights reserved.

关键词： Rivers

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The study of Coastline Changing and Total Suspended Solid Distribution Based on the Remote Sensing Data in Teluk Lamong Multipurpose Port Terminal 8

The Study of Coastline Changing and Total Suspended Solid Di...

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8th International Seminar on ocean and Coastal engineering, Environmental and Natural Disaster Management, ISOCEEN 2020

作者： Pratikto, Widi Agoes Fitriadhy, Ahmad Maulana, Muhammad Ilham Huda, Abiyani Choirul Putri, Destyariani Liana Simatupang, Liany Ayu Wahyudi, Nazariano Rahman Laksono, Rendatiyarso Dewi, Anggie Vibriyanti Rossari Ocean Engineering Departement Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Department of Maritime Technology Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu Malaysia Ocean Engineering Study Program Institut Teknologi Kalimantan Kalimantan Timur76127 Indonesia

Looking forward to the abovementioned conditions, this research is needed to elaborate on the effects of the reclamation to the marine resources in Teluk Lamong Multipurpose Port Terminal as the reclaimed product. In order to describe the impact of the port development, this study will analyze the shoreline changing, the current pattern modeling, as well as the Total Suspended Solid (TSS) modeling using the remote sensing data. The several numbers of expected objectives through this study are to get the set of scientific information on the shoreline changing in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, to get the figure of current pattern in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, and to elaborate TSS concentration through the modeling approach in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020. Hence, there is a set of methodologies and tools to cooperate with the information before and after the reclamation. The use of the Digital Shoreline Analysis System (DSAS) software to analyze coastline conditions. The using of Mike 21 to analyze the current pattern and TSS concentrations. In addition to the TSS analysis, it will also need a set of remote sensing data from the Google Earth Engine (GEE). The modeling and calculation give information about the End Point Rate (EPR) values and TSS values. The EPR values are 107.5 m/year, 59,625 m/year and 10,375 m / year. The TSS values are 0-20 mg/L, 20.1-40 mg/L, 40.1-80 mg/L, 80.1-120 mg/L and >120.1 mg/L. Moreover, the result shows the different values among the length of coastline, the current pattern, and TTS in the years 2012 and 2020. The difference in the coastline reaches 950 m at this latest 8 years. While it also brings the changing to the current pattern and sediment transport which show through its current velocity and sediment content per liter of seawater during high and low tide accordingly. © Published under licence by IOP Publishing

关键词： Sediment transport

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Toward green and sustaianable ship recycling industry in Indonesia 6

Toward green and sustaianable ship recycling industry in Ind...

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6th International Conference on Ship and Offshore Technology - Indonesia: Developments Marine Design, Construction and Operation, ICSOT Indonesia 2019

作者： Sunaryo Djatmiko, E.B. Kurt, R.E. Naval Architecture and Marine Engineering Study Program Universitas Indonesia Indonesia Department of Marine Engineering Institut Teknologi Sepuluh Nopember Indonesia Department of Naval Architecture Ocean and Marine Engineering University of Strathclyde United Kingdom

ISBN: (纸本)9781713830368

The main aim of this project is to develop a sustainable, safe & environmentally sound ship recycling industry in Indonesia. As the world's largest archipelago state, it is essential for Indonesia to maintain a large fleet of ships to ensure sufficient sea transportation. However, after completing their operational life, all these ships are required to be dismantled. Currently, there is no proper understanding & infrastructure for 'Ship Recycling' in Indonesia yet. This lack of understanding causes serious contamination of the sea which results in harming the environment. Furthermore, the working conditions are extremely poor because the yards are not fit for purpose and workers are exposed to many hazards. Referring to International Maritime Organization’s Hong Kong Convention a project is carried out to preparing the process of establishing green and sustainable ship recycling industry in Indonesia by conducting gap analyses and proposing environmentally friendly ship recycling yard concept. © 2019: The Royal Institution of Naval Architects.

关键词： Ships

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Current Characteristics and Shoreline Change at Pondok-Bali, North Coast-West Java of Indonesia

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Procedia Earth and Planetary Science 2015年 14卷 161-165页

作者： Hendra Achiari Agung Wiyono Jun Sasaki Ocean Engineering Study Program Institut Teknologi Bandung (ITB) INDONESIA Civil Engineering Study Program Institut Teknologi Bandung (ITB) INDONESIA Dept of Socio-Cultural Environmental Studies The University of Tokyo JAPAN

Numerical model of shoreline change by GENESIS (Generalized Model for Simulating Shoreline Change) and some field surveys were performed in the Pondok-bali Subang Distric of Indonesia. The objective of this investigation is to learn the cause of shoreline retreat that happen in Pondok-bali and its surrounding area in ten years nowadays. Based on field observation and the study result, we found that the waves occurred in East-wind monsoon, rip current and inundation due to water level raised have the significant contribution on an impact to shoreline retreat in Pondok -Bali.

关键词： GENESIS rip current field survey shoreline retreat sediment transport

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The impact of bottom water light exposure on electrical and sediment remediation performance of sediment microbial fuel cells

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Chemosphere 2024年 362卷 142720页

作者： Misali, Rashida Mohd Noor, Nurfarhana Nabila Oktavitri, Nur Indradewi Kim, Kyunghoi Department of Ocean Engineering Pukyong National University Busan48513 Korea Republic of Study Program of Environmental Engineering Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia

Sediment microbial fuel cells (SMFCs) generate bioelectricity from benthic sediments and thus providing both bioelectricity generation and sediment remediation. However, the high internal resistance of the cathode leads to a low power output, which requires research on cathode treatment. In this study, we explored the influence of light irradiation on bioelectricity production and nutrient removal in the SMFC system. The microcosm experiment of the SMFC system was designed with artificial illumination of 500 lux (light-SMFC) and compared with dark conditions of 15 lux (dark-SMFC), which showed that the current increases during photoperiods. The study reveals that light-illuminated SMFC consistently produced the highest voltage, with the highest voltage (553 mV) being 1.3 times higher than the dark-SMFC (440 mV). The polarization curves show a significant reduction in internal cathodic resistance under light condition, resulting in increased voltage generation. The light-SMFC exhibits the highest maximum power density of 35.93 mW/m2, surpassing the dark SMFC of 31.13 mW/m2. It was found that light illumination in the SMFC system increases oxygen availability in the cathodic region, which supports the oxygen reduction reaction (ORR) process. At the same time, the high bioelectricity output contributes to the highest sediment remediation by greatly reducing the chemical oxygen demand (COD) and phosphate (PO4–P) concentrations. The study highlights the potential of light illumination in mitigating cathodic limitation to improve SMFC performance and nutrient removal. © 2024

关键词： Microbial fuel cells

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Trajectory Analysis of Inter-Island Logistics Transportation for Aggregate Material Using Web-Based Information 2

Trajectory Analysis of Inter-Island Logistics Transportation...

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2nd International Conference on Technology Innovation and Its Applications, ICTIIA 2024

作者： Suraji, Aji Ishak, Syarifuddin Prabowo, Prabowo Fatkhurrozi, Muhammad Alawy, Gholiqul Amrodh Putra, Rangga Pahlevi University of Widyagama Malang Dept. of Civil Engineering Malang City Indonesia Malang State University Study Program of D4 Eng. Tech and Civil Building Maintenance Malang City Indonesia Institut Teknologi Sumatera Dept. of Ocean Engineering Lampung Selatan Regency Indonesia University of Widyagama Malang Dept. of Informatics Engineering Malang City Indonesia

ISBN: (纸本)9798350351613

Transportation of material aggregates over long distances and between islands requires a long time by changing modes of transportation. Therefore, determining a material aggregate travel trajectory model using a web database is something that can help in logistics movement analysis. This study aims to create a web-based material aggregate transportation trajectory model. The data collection method involves extracting data with Google Maps which shows distance and time indications. Next, validation is carried out in the field with a direct survey at the location. The analytical method uses statistical methods to create modeling using a linear regression model approach and statistical tests using anova. The results of the study show that the linear regression model is simple with an independent variable coefficient of 0.0306 and an R-square of 0.8649. Meanwhile, using the ANOVA test, it was stated that the modeling results were quite significant and the model could be used to make predictions. © 2024 IEEE.

关键词： aggregate material logistics trajectory transportation web-based information

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Analysis of tsunami hazard in the Southern Coast of West Java Province - Indonesia 2

Analysis of tsunami hazard in the Southern Coast of West Jav...

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2nd Maritime Science and Advanced Technology: Marine Science and Technology in Framework of The Sustainable Development Goals, MSAT 2019

作者： Windupranata, W. Hanifa, N.R. Nusantara, C.A.D.S. Aristawati, G. Arifianto, M.R. Research Group of Coastal Ocean and Maritime Engineering Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia Centre for Earthquake Science and Technology Research Centre for Disaster Mitigation Institut Teknologi Bandung Indonesia Research Laboratory of Hydrography Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia Study Program of Geodesy and Geomatics Engineering Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia

The Southern Coast of West Java Province in the Java Islands is one of prone and exposed area to tsunami hazard. It has about 428 kilometers coastline length, covering 5 administrational regencies (i.e. Sukabumi, Cianjur, Garut, Tasikmalaya, and Pangandaran). It is a strategic area that support many economic activities including tourism, fisheries, electricity power plants, agricultures, markets as well as social factors such as coastal villages, schools and other public facilities. The existence of this strategic area is threatened by the potential for a tsunami disaster mainly from megathrust along the Southern Coast of Java Island. On 2006, a tsunami earthquake of M7.7 occurred off Pangandaran Regency with tsunami height of 5-8 meters and inundated about 500 meters along southern coast of West and Central Java Province. The tsunami caused more than 600 casualties and damage to buildings, public facilities and insfrastructure. Yet, the Indonesia National Earthquake Source and Hazard Map suggest a bigger threat of a plausible M8.7 - M9.2 megathrust earthquake off Java island. This research aims to analyze and map potential areas affected by the tsunami in the South Coast of West Java Province based on numerical modelling carried out with Cornell Multi-grid Coupled Tsunami Model (COMCOT) v1.7 based on the several megathrust earthquake scenarios in southern off West Java. The results of tsunami modelling show that the highest impact is generated in the Sunda Straits & West Java - Central Java Megathrust Scenarios with highest tsunami inundation and the fastest travel time occurred in Cianjur Regency with 26,7 meters height and estimated arrival time of tsunami wave approximately 10 minutes after the mainshock, while the farthest inundation distance is estimated in Sukabumi Regency about 5.8 kilometers from the coast due to existence of river. © Published under licence by IOP Publishing Ltd.

关键词： Hazards

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