A Syakti - Academia.edu (original) (raw)

Papers by A Syakti

The study aimes to examine the accumulation level of selected heavy metal Cd in various of common... more The study aimes to examine the accumulation level of selected heavy metal Cd in various of common mud crab ( Scylla spp.) samples from Segara Anakan Lagoon-Cilacap. Mangrove crab and sediment samples were taken from Segara Anakan (108046’–109005’E; 7034’–7048’S) and were analyzed using Atomic Absorption Spectrophotometer (AAS). The Cd extent in Scylla spp. varied from 0.084 - 0.273 ppm which still below the European Commission (2006) threshold value (0.5 ppm). On the other hand Cd concentration in sediment for most stations value (0.625 - 1.635 ppm) have exceeded the Interim marine sediment quality guidelines (ISQGs value; 0.7 ppm) except for station 2 and 4. Concerning the sediment, to interpret and assess the contamination status four indices were used, namely Contamination Factor (CF), Enrichment Factor (EF), Pollution Load Index (PLI), and Geoaccumulation Index ( Igeo ). The results show the Segara Anakan sediment value for CF varied 3.125 - 8.175, EF was 50.481, PLI was 5.381 a...

IOP Conference Series: Earth and Environmental Science, 2022

Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have conta... more Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have contaminated the conch snail species Strombus sp. and sediments in the waters of North Bintan. This study aims to provide a basic report on the number of stranded plastic crumbs (micro) and the contamination level in conch Snails (Strombus sp.) In North Bintan waters. The methods used in this research are survey and quantitative methods. Determination of the location point by purposive sampling. The procedure is divided into two stages: quadrant sampling in the field and analysis of microplastic particles in the laboratory with H2O2 liquid as an oxidizing agent and ZnCl2 solution as a microplastic determinant with a floating system. 16.4 ± 31.6 particles/individuals. Meanwhile, the level of contamination that occurs in Strombus sp. experienced in Pengudang Village by 88%, which means that on average each individual at the Pengudang station has the potential to be contaminated with 22 micropla...

IOP Conference Series: Earth and Environmental Science, 2021

The objective of this research was to collect the comprehensive information about the characteris... more The objective of this research was to collect the comprehensive information about the characteristics of sea waves in the northern and eastern of Bintan Island Sea based on differentiation in oceanographic conditions between the north and east coast of Bintan Island. The north coast of Bintan Island faces the open seas directly with a potential high wave and cause several characters of coastal damage, including coastal abrasion. The characteristics of sea waves are obtained by forecasting, namely converting wind speed values using the SPM (Shore Protection Manual) method. The results of this study collected comprehensive information of sea waves on the north coast during the 2015-2019 period showed a dominant pattern with the direction of sea wave propagation from north and south, while for the eastern region the wave propagation trends prevailing from north and southeast. The maximum sea wave height in the northern of Bintan Island Sea reaches 3.32 m with a period of 8.70 s while i...

The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated... more The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated. The two-dimensional numerical model of Oil Spill Analysis (SA) was used to simulate oil spill dispersion. The simulation showed that for daily period, the oil dispersion was dominated by advection processes due to tidal current. When South-East Monsoon (SEM) active the oil spill propagate into the eastern of the Timor sea until 300km long at the end of simulation. The high value of the exposure time lay on the Northern part of the Timor sea and the coast of the Roti island. The comparsion of the numerical results and SAR images was done by calculation of contaminant area show a good agreement.

Regional Studies in Marine Science, 2019

We investigated the contamination of marine plastic debris from the Indonesian Cilacap coast and ... more We investigated the contamination of marine plastic debris from the Indonesian Cilacap coast and the North Atlantic gyre by polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs). The mean concentrations of 15 PAHs in gyre were 58 and 142 ng/g in polyethylene (PE) and polyethylene terephthalate (PET) debris, respectively, while PE and polypropylene (PP) Indonesian debris exhibited an average content of 552 ng/g (mainly naphthalene). The mean concentration of 61 PCBs in open ocean debris was 12.2 ng/g, while coastal debris showed a worryingly high mean value of 1.4×10 4 ng/g, with the notable presence of CB6, 101 and 173. PE gyre debris contained mostly high molecular weight PAHs such as benzo(g,h,i)perylene and indeno(1,2,3-cd)pyrene and low-chlorinated PCBs such as CB52, 77 and 105, whereas PET debris contained low molecular weight PAHs (mainly acenaphthylene and phenanthrene) and high-chlorinated PCBs such as CB204. Highlights • First results on the pollution of plastic debris from Indonesian coast and North Atlantic gyre • The cumulative PAHs and PCBs' concentration is 91 ng/g in North Atlantic gyre debris. • Indonesian coastal debris are 150 times more polluted than North Atlantic gyre ones • PAHs' concentrations in PET from the North Atlantic gyre are slightly higher than in PE • Fingerprints of PAHs and PCBs in marine plastic contrasted according to the microplastic source.

Marine pollution bulletin, Jan 15, 2017

Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sedim... more Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sediment from 28 sites Djibouti city. The concentrations of trace elements varied from 0 to 288.1mg/kg with relative abundance of trace metals in sediments was in the order of Zn>Cu>Ni>Cr>Co>Pb>Cd. Zn, Cu and Ni exceeded consensus based sediment quality guideline values 7, 14, 15 sites respectively. Enrichment factor and pollution load index showed relatively low to moderate contamination. The concentrations of total 16 PAHs varied widely depending on the sample location and ranged from 2.65 to 3760.11ng·g(-1), with the mean concentration value of 387.87ng·g(-1). Compositions and relative abundance of individual PAH using molecular diagnostic ratio using congener's m/z 178 and 202 indicated pyrolytic origin and reflecting a petroleum combustion, grass/wood and coal combustion and a petrogenic source. This study represents the first pollution baseline and a reference for ...

Jurnal Rekayasa Elektrika, 2017

Autonomous Underwater Vehicle (AUV) adalah wahana bawah air tanpa awak untuk menjalankan misi ter... more Autonomous Underwater Vehicle (AUV) adalah wahana bawah air tanpa awak untuk menjalankan misi tertentu. Sensor yang ada pada AUV diantaranya side scan sonar, single beam echosounder, Conductivity Temperature Depth (CTD), dan kamera video bawah air. Sensor tersebut dapat dijadikan alat untuk mengetahui kondisi di kolom dan dasar laut. Pengujian gerak dilakukan untuk melihat kestabilan AUV. Data hasil survey AUV di perairan Malang Rapat Tanjung Pinang diolah menggunakan perangkat lunak Neptus. Visualisasi side scan sonar (SSS) dibandingkan dengan hasil rekaman kamera video. Pemrosesan sinyal SSS memiliki pola yang dapat diidentifikasi sesuai dengan tampilan video. Karakteristik substrat dasar laut memiliki sinyal yang berbeda. Pengamatan sensor CTD menghasilkan profil suhu dan salinitas perairan. Hubungan antara kenampakan visual kondisi dasar laut hasil video dan hasil citra SSS dapat dijadikan acuan untuk identifikasi habitat bentik. Kata kunci: autonomous, hambur balik, kamera video bawah air, side scan sonar, wahana bawah air Abstract-Autonomous Underwater Vehicle (AUV) is unmanned submersible platform for a certain mission. The sensor on AUV were including side scan sonar, single beam echosounder, Conductivity Temperature Depth (CTD), and underwater video camera. These sensors were used as a tool to determine the condition of water column and the seabed. AUV data obtained in Malang Rapat of Tanjung Pinang seawater was processed using Neptus software. Motion testing was conducted to see the stability of AUV. Visualization of side scan sonar (SSS) was compared to underwater video camera. The processing of SSS produce a unique signal pattern and it can be identified according to the video display. Diverse of seabed substrate was followed by different SSS signal. CTD sensor produce water temperature and salinity profiles in the survey area. The relationship between the visual condition of the seabed obtained by underwater video and SSS imagery may serve as a reference for benthic habitat identification.

Again and again, Omni-Akuatika increases the number of the article published in this volume, 20 e... more Again and again, Omni-Akuatika increases the number of the article published in this volume, 20 excellence papers from a broad range of topic related with the fisheries and marine science field are available for you all. We hope our contribution meet your expectation and satisfaction. This achievement is definitely resulted from your trust to disseminate your research work for our audiences. Restated from the previous Editorial, Internationalization of our journal is strategically important in order to enhance the readability and impact of Omni-Akuatika for the scientific community. This policy is in accordance with Indonesian Government expectation through Minister of Research, technology and Higher Education stating and encouraging scientific communication i.e. international publication is one valuable indicator of country's competitiveness. As usual, we will describe 20 research papers published in this volume.

Omni-Akuatika, 2020

The herbivorous fishes have been considered as a critical functional group and have capability ma... more The herbivorous fishes have been considered as a critical functional group and have capability maintaining coral reef resilience and avoiding coral-algal phase-shifts. The present condition shown, almost in tropical reef location, alga has dominated coral, even in the small outer island. The requirement to conduct comprehensive basic research in studying the patterns and composition of herbivorous fish, especially on the small outer islands. Twelve coral reef sites in eastern Indonesia (Liki Islands) and western Indonesia (Natuna Island) used as a research location for comparing the structure patterns of herbivorous fish communities (diversity, density, and body size) using the Underwater Visual Census (UVC) method. There was different pattern of herbivorous fishes families in Liki Island and Natuna Islands, where Acanthuridae is dominant in eastern Indonesia (Liki Islands), including Ctenochaetus striatus (41,00 ± 11,72 se) individuals/350m2, A. maculiceps (23,33 ± 13,61 se) indivi...

IOP Conference Series: Materials Science and Engineering, 2016

Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively usi... more Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively using GC/MS method in eight coastal stations located in the Jakarta Bay, North of Jakarta, Indonesia. The total concentrations n-alkanes have ranged from 480 mu g.kg(-1) to 1,935 mu g.kg(-1) sediment dry weight. Several ratios (e.g. CPI24-32, NAR, TAR, Pr/Phy, n-C-17/Pr, n-C-18/Phyt, n-C-29/n-C-17, Sigma n-alkanes/n-C16LMW/HMW, Paq and TMD) were used to evaluate the possible sources of terrestrial-marine inputs of these hydrocarbons in the sediments. The various origins of aliphatic hydrocarbons were generally biogenic, including both terrigenous and marine, with an anthropogenic pyrolytic contribution (petrogenic and biogenic combustion). Two stations (G,H) were thehighest concentration and had potential risk to environment

IOP Conference Series: Materials Science and Engineering, 2016

Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseill... more Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseille, France,have been analysed using GC-QQQ/MS for their hydrocarbons (n-alkanes and polyaromatic hydrocarbons (PAHs)) extentwith two different solvent extraction, such as heptane:dichloromethane (HEP:DCM;1:1) and heptane:acetone (HEP:ACE; 1:1). The results showed hydrocarbons yielded from heptane:acetone extractionwere 28335 μg.kg- 1mussels dw (Ʃ n-alkanes C15-34) and 202 μg.kg-1mussels dw(ƩPAHs) while the yield from heptane:DCM extract was lower ca. 27026 μg.kg-1musselsdw and 133 μg.kg-1 mussels dw respectively from the Ʃn-alkanesC15-34and ƩPAHs. High hydrocarbon levels can be affected by the presence of lipids or other metabolites in mussels that have the same polarity with hydrocarbon compounds which has interferred the measurement. Several ratio parameter of n- alcanes and PAHs source in the mussels were evaluated to asses the origins of their hydrocarbons in mussels from which we suggested origins of hydrocarbons were pyrolytic and biogenic rather than petrogenic.

Waste and Biomass Valorization, 2011

This paper describes the study of a surfactantproducing bacterial strain of Bacillus megaterium. ... more This paper describes the study of a surfactantproducing bacterial strain of Bacillus megaterium. The study determined the conditions that favor the production of surfactant and how this bacterial strain functions in the biodegradation of fluorene. Crude biosurfactant was produced from B. megaterium on mineral salt media (MSM) supplemented with either acetate ammonium (MSM-AA) or crude oil (MSM-CO) as sole carbon source. The B. megaterium showed the highest crude biosurfactant yield (2.99 ± 0.11 g L-1) when grown on MSM-AA, while a yield of 2.63 ± 0.04 g L-1 was found on MSM-CO. Biosurfactant activities were observed in both media with a 35.68 ± 1.05 and 28.48 ± 0.39 mN/m reduction in surface tension when using acetate ammonium and crude oil, respectively. FTIR spectroscopy showed that carbon substrates induce the same glycolipid classes for both MSM-AA and MSM-CO. The results clearly demonstrated that carbon substrates affect biosurfactant production in terms of yield, and that the increase of fluorene removal by approximately 1.5 and 2 compared to the control was due to the presence of the amended crude biosurfactant from MSM-AA and MSM-CO, respectively, after 28 days.

Science of The Total Environment, 2014

• n-alkanes, PAHs, PCBs and pesticides were analyzed in the Huveaune River sediments. • The use o... more • n-alkanes, PAHs, PCBs and pesticides were analyzed in the Huveaune River sediments. • The use of aliphatic and PAH diagnostic indices to assess hydrocarbon sources • Results in sediments showed inputs of terrestrial biogenic hydrocarbons together with anthropic contribution. • The high level of several compounds represents an ecological risk. • The results can be used as a recommendation for a better "ecological governance".

Research in Microbiology, 2006

This in vitro study was conducted in order to determine the effects of hydrocarbons and growth ph... more This in vitro study was conducted in order to determine the effects of hydrocarbons and growth phase on the phospholipid ester-linked fatty acid composition of two marine sedimentary hydrocarbon-degrading bacteria. These two strains, namely Corynebacterium sp. and Sphingomonas sp. 2MPII, were cultivated on either a simple soluble substrate (ammonium acetate) or a hydrocarbon (respectively n-eicosane and phenanthrene). The incubations were stopped at different times corresponding to point of lag (2 days), exponential (7 days) and stationary phases (21 and 56 days). The effects of growth phase and hydrophobic substrates were successfully demonstrated by a simple index, given as the sum of saturated fatty acids divided by the sum of unsaturated fatty acids (SFA/ MUFA), ranging from 1.4 to 3, 0.3 to 0.6, and 0.5 to 1.0 for Corynebacterium sp., Sphingomonas sp. 2MPII, and mixed cultures, respectively. This result was validated by a principal component analysis. In pure cultures, the phospholipid fatty acid (PLFA) composition was strongly influenced by both the carbon source and the growth phase. Nevertheless, the two strains showed different "behaviors". For 2MPII, the main PLFA composition changes were observed at 2 days while they were progressive as a function of time for Corynebacterium sp. These differences could explain the evolution of PLFAs of mixed cultures.

Organic Geochemistry, 2006

Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation ... more Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation and phospholipid fatty acid (PLFA) composition in either non-contaminated (NC) or contaminated (C) sedimentary microcosms with a crude oil. An analytical procedure was developed to extract both hydrocarbons and PLFAs from the same culture. PLFAs were analyzed over time during an aerobic microcosm experiment (0–21 days) to obtain a better

Plant Ecology and Evolution, 2019

Background and aims – The present study aims to describe a new species of pennate blue diatom fro... more Background and aims – The present study aims to describe a new species of pennate blue diatom from the genus Haslea, H. nusantara sp. nov., collected from Semak Daun Island, the Seribu Archipelago, in Indonesian marine waters. Methods – Assessment for species identification was conducted using light microscopy, Scanning Electron Microscopy and molecular techniques. The morphological characteristics of H. nusantara have been described, illustrated and compared to other morphologically similar blue Haslea taxa, distributed worldwide. Additionally, molecular characterization was achieved by sequencing plastidial and mitochondrial genomes. Key results – This new species, named Haslea nusantara, cannot be discriminated by its morphology (stria density) but it is characterized by its gene sequences (rbcL chloroplast gene and cox1 mitochondrial gene). Moreover, it differentiates from other blue Haslea species by the presence of a thin central bar, which has been previously reported in non-...

Omni-Akuatika, Nov 29, 2017

Eastern part of Segara Anakan Lagoon (E-SAL) is an estuarine ecosystem to dispose industrial wast... more Eastern part of Segara Anakan Lagoon (E-SAL) is an estuarine ecosystem to dispose industrial waste i.e. lead (Pb) containing waste. The study aims to analysis the distribution of Pb in soil, water and mangrove vegetation matrices. Several parameters including bioaccumulation factor (BAF), translocation factor (TF), leaf morphometric (the effect of Pb for mangrove vegetation) were used to estimate their impact. We developed a pre-design of mangrove zone as a model in reducing Pb cntaminantion in E-SAL. The results showed the distribution of Pb in E-SAL was 0.177-0.233 mg/L (water), 0.320-0.780 mg/kg (soil), 4.80-8.67 mg/kg (mangrove root), 2.48-6.96 mg/kg (mangrove stem), and 1.48-4.76 mg/kg (mangrove leaf). The scoring of BAF in mangrove vegetation had value between 22.2-40.1 and TF between 0.9-1.3. The distribution of Pb in soil depths were 8.89 mg/kg (0-50 cm) to 0.56 mg/kg (150-200 cm). The impact of Pb was 2-60 % of leaf damage on surface leafs. The mangrove zone to reduce impact of Pb in E-SAL was Rhizophora apiculata, Bruguiera sexangula, Aegiceras corniculatum and Sonneratia caseolaris as mangrove species in the first zone.

Omni-Akuatika, 2015

Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-m... more Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-metalcontaminations in the sea. In this research, the concentrations of four elements Ni, Cu, Zn and Cd in P. viridis and in the serum of rat which orally feed by P. viridis were determined by Atomic Absorption Spectrometry (AAS) following dry acid digestion. Parameter analysis was evaluated by determining confidence limit for the obtained results. The result showed that there was a sequence of heavy-metal content in green mussels sample and laboratory rats serum, such as Ni < Cd…

Environmental Science and Pollution Research

IOP Conference Series: Earth and Environmental Science

The study aimes to examine the accumulation level of selected heavy metal Cd in various of common... more The study aimes to examine the accumulation level of selected heavy metal Cd in various of common mud crab ( Scylla spp.) samples from Segara Anakan Lagoon-Cilacap. Mangrove crab and sediment samples were taken from Segara Anakan (108046’–109005’E; 7034’–7048’S) and were analyzed using Atomic Absorption Spectrophotometer (AAS). The Cd extent in Scylla spp. varied from 0.084 - 0.273 ppm which still below the European Commission (2006) threshold value (0.5 ppm). On the other hand Cd concentration in sediment for most stations value (0.625 - 1.635 ppm) have exceeded the Interim marine sediment quality guidelines (ISQGs value; 0.7 ppm) except for station 2 and 4. Concerning the sediment, to interpret and assess the contamination status four indices were used, namely Contamination Factor (CF), Enrichment Factor (EF), Pollution Load Index (PLI), and Geoaccumulation Index ( Igeo ). The results show the Segara Anakan sediment value for CF varied 3.125 - 8.175, EF was 50.481, PLI was 5.381 a...

IOP Conference Series: Earth and Environmental Science, 2022

Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have conta... more Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have contaminated the conch snail species Strombus sp. and sediments in the waters of North Bintan. This study aims to provide a basic report on the number of stranded plastic crumbs (micro) and the contamination level in conch Snails (Strombus sp.) In North Bintan waters. The methods used in this research are survey and quantitative methods. Determination of the location point by purposive sampling. The procedure is divided into two stages: quadrant sampling in the field and analysis of microplastic particles in the laboratory with H2O2 liquid as an oxidizing agent and ZnCl2 solution as a microplastic determinant with a floating system. 16.4 ± 31.6 particles/individuals. Meanwhile, the level of contamination that occurs in Strombus sp. experienced in Pengudang Village by 88%, which means that on average each individual at the Pengudang station has the potential to be contaminated with 22 micropla...

IOP Conference Series: Earth and Environmental Science, 2021

The objective of this research was to collect the comprehensive information about the characteris... more The objective of this research was to collect the comprehensive information about the characteristics of sea waves in the northern and eastern of Bintan Island Sea based on differentiation in oceanographic conditions between the north and east coast of Bintan Island. The north coast of Bintan Island faces the open seas directly with a potential high wave and cause several characters of coastal damage, including coastal abrasion. The characteristics of sea waves are obtained by forecasting, namely converting wind speed values using the SPM (Shore Protection Manual) method. The results of this study collected comprehensive information of sea waves on the north coast during the 2015-2019 period showed a dominant pattern with the direction of sea wave propagation from north and south, while for the eastern region the wave propagation trends prevailing from north and southeast. The maximum sea wave height in the northern of Bintan Island Sea reaches 3.32 m with a period of 8.70 s while i...

The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated... more The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated. The two-dimensional numerical model of Oil Spill Analysis (SA) was used to simulate oil spill dispersion. The simulation showed that for daily period, the oil dispersion was dominated by advection processes due to tidal current. When South-East Monsoon (SEM) active the oil spill propagate into the eastern of the Timor sea until 300km long at the end of simulation. The high value of the exposure time lay on the Northern part of the Timor sea and the coast of the Roti island. The comparsion of the numerical results and SAR images was done by calculation of contaminant area show a good agreement.

Regional Studies in Marine Science, 2019

We investigated the contamination of marine plastic debris from the Indonesian Cilacap coast and ... more We investigated the contamination of marine plastic debris from the Indonesian Cilacap coast and the North Atlantic gyre by polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs). The mean concentrations of 15 PAHs in gyre were 58 and 142 ng/g in polyethylene (PE) and polyethylene terephthalate (PET) debris, respectively, while PE and polypropylene (PP) Indonesian debris exhibited an average content of 552 ng/g (mainly naphthalene). The mean concentration of 61 PCBs in open ocean debris was 12.2 ng/g, while coastal debris showed a worryingly high mean value of 1.4×10 4 ng/g, with the notable presence of CB6, 101 and 173. PE gyre debris contained mostly high molecular weight PAHs such as benzo(g,h,i)perylene and indeno(1,2,3-cd)pyrene and low-chlorinated PCBs such as CB52, 77 and 105, whereas PET debris contained low molecular weight PAHs (mainly acenaphthylene and phenanthrene) and high-chlorinated PCBs such as CB204. Highlights • First results on the pollution of plastic debris from Indonesian coast and North Atlantic gyre • The cumulative PAHs and PCBs' concentration is 91 ng/g in North Atlantic gyre debris. • Indonesian coastal debris are 150 times more polluted than North Atlantic gyre ones • PAHs' concentrations in PET from the North Atlantic gyre are slightly higher than in PE • Fingerprints of PAHs and PCBs in marine plastic contrasted according to the microplastic source.

Marine pollution bulletin, Jan 15, 2017

Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sedim... more Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sediment from 28 sites Djibouti city. The concentrations of trace elements varied from 0 to 288.1mg/kg with relative abundance of trace metals in sediments was in the order of Zn>Cu>Ni>Cr>Co>Pb>Cd. Zn, Cu and Ni exceeded consensus based sediment quality guideline values 7, 14, 15 sites respectively. Enrichment factor and pollution load index showed relatively low to moderate contamination. The concentrations of total 16 PAHs varied widely depending on the sample location and ranged from 2.65 to 3760.11ng·g(-1), with the mean concentration value of 387.87ng·g(-1). Compositions and relative abundance of individual PAH using molecular diagnostic ratio using congener's m/z 178 and 202 indicated pyrolytic origin and reflecting a petroleum combustion, grass/wood and coal combustion and a petrogenic source. This study represents the first pollution baseline and a reference for ...

Jurnal Rekayasa Elektrika, 2017

Autonomous Underwater Vehicle (AUV) adalah wahana bawah air tanpa awak untuk menjalankan misi ter... more Autonomous Underwater Vehicle (AUV) adalah wahana bawah air tanpa awak untuk menjalankan misi tertentu. Sensor yang ada pada AUV diantaranya side scan sonar, single beam echosounder, Conductivity Temperature Depth (CTD), dan kamera video bawah air. Sensor tersebut dapat dijadikan alat untuk mengetahui kondisi di kolom dan dasar laut. Pengujian gerak dilakukan untuk melihat kestabilan AUV. Data hasil survey AUV di perairan Malang Rapat Tanjung Pinang diolah menggunakan perangkat lunak Neptus. Visualisasi side scan sonar (SSS) dibandingkan dengan hasil rekaman kamera video. Pemrosesan sinyal SSS memiliki pola yang dapat diidentifikasi sesuai dengan tampilan video. Karakteristik substrat dasar laut memiliki sinyal yang berbeda. Pengamatan sensor CTD menghasilkan profil suhu dan salinitas perairan. Hubungan antara kenampakan visual kondisi dasar laut hasil video dan hasil citra SSS dapat dijadikan acuan untuk identifikasi habitat bentik. Kata kunci: autonomous, hambur balik, kamera video bawah air, side scan sonar, wahana bawah air Abstract-Autonomous Underwater Vehicle (AUV) is unmanned submersible platform for a certain mission. The sensor on AUV were including side scan sonar, single beam echosounder, Conductivity Temperature Depth (CTD), and underwater video camera. These sensors were used as a tool to determine the condition of water column and the seabed. AUV data obtained in Malang Rapat of Tanjung Pinang seawater was processed using Neptus software. Motion testing was conducted to see the stability of AUV. Visualization of side scan sonar (SSS) was compared to underwater video camera. The processing of SSS produce a unique signal pattern and it can be identified according to the video display. Diverse of seabed substrate was followed by different SSS signal. CTD sensor produce water temperature and salinity profiles in the survey area. The relationship between the visual condition of the seabed obtained by underwater video and SSS imagery may serve as a reference for benthic habitat identification.

Again and again, Omni-Akuatika increases the number of the article published in this volume, 20 e... more Again and again, Omni-Akuatika increases the number of the article published in this volume, 20 excellence papers from a broad range of topic related with the fisheries and marine science field are available for you all. We hope our contribution meet your expectation and satisfaction. This achievement is definitely resulted from your trust to disseminate your research work for our audiences. Restated from the previous Editorial, Internationalization of our journal is strategically important in order to enhance the readability and impact of Omni-Akuatika for the scientific community. This policy is in accordance with Indonesian Government expectation through Minister of Research, technology and Higher Education stating and encouraging scientific communication i.e. international publication is one valuable indicator of country's competitiveness. As usual, we will describe 20 research papers published in this volume.

Omni-Akuatika, 2020

The herbivorous fishes have been considered as a critical functional group and have capability ma... more The herbivorous fishes have been considered as a critical functional group and have capability maintaining coral reef resilience and avoiding coral-algal phase-shifts. The present condition shown, almost in tropical reef location, alga has dominated coral, even in the small outer island. The requirement to conduct comprehensive basic research in studying the patterns and composition of herbivorous fish, especially on the small outer islands. Twelve coral reef sites in eastern Indonesia (Liki Islands) and western Indonesia (Natuna Island) used as a research location for comparing the structure patterns of herbivorous fish communities (diversity, density, and body size) using the Underwater Visual Census (UVC) method. There was different pattern of herbivorous fishes families in Liki Island and Natuna Islands, where Acanthuridae is dominant in eastern Indonesia (Liki Islands), including Ctenochaetus striatus (41,00 ± 11,72 se) individuals/350m2, A. maculiceps (23,33 ± 13,61 se) indivi...

IOP Conference Series: Materials Science and Engineering, 2016

Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively usi... more Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively using GC/MS method in eight coastal stations located in the Jakarta Bay, North of Jakarta, Indonesia. The total concentrations n-alkanes have ranged from 480 mu g.kg(-1) to 1,935 mu g.kg(-1) sediment dry weight. Several ratios (e.g. CPI24-32, NAR, TAR, Pr/Phy, n-C-17/Pr, n-C-18/Phyt, n-C-29/n-C-17, Sigma n-alkanes/n-C16LMW/HMW, Paq and TMD) were used to evaluate the possible sources of terrestrial-marine inputs of these hydrocarbons in the sediments. The various origins of aliphatic hydrocarbons were generally biogenic, including both terrigenous and marine, with an anthropogenic pyrolytic contribution (petrogenic and biogenic combustion). Two stations (G,H) were thehighest concentration and had potential risk to environment

IOP Conference Series: Materials Science and Engineering, 2016

Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseill... more Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseille, France,have been analysed using GC-QQQ/MS for their hydrocarbons (n-alkanes and polyaromatic hydrocarbons (PAHs)) extentwith two different solvent extraction, such as heptane:dichloromethane (HEP:DCM;1:1) and heptane:acetone (HEP:ACE; 1:1). The results showed hydrocarbons yielded from heptane:acetone extractionwere 28335 μg.kg- 1mussels dw (Ʃ n-alkanes C15-34) and 202 μg.kg-1mussels dw(ƩPAHs) while the yield from heptane:DCM extract was lower ca. 27026 μg.kg-1musselsdw and 133 μg.kg-1 mussels dw respectively from the Ʃn-alkanesC15-34and ƩPAHs. High hydrocarbon levels can be affected by the presence of lipids or other metabolites in mussels that have the same polarity with hydrocarbon compounds which has interferred the measurement. Several ratio parameter of n- alcanes and PAHs source in the mussels were evaluated to asses the origins of their hydrocarbons in mussels from which we suggested origins of hydrocarbons were pyrolytic and biogenic rather than petrogenic.

Waste and Biomass Valorization, 2011

This paper describes the study of a surfactantproducing bacterial strain of Bacillus megaterium. ... more This paper describes the study of a surfactantproducing bacterial strain of Bacillus megaterium. The study determined the conditions that favor the production of surfactant and how this bacterial strain functions in the biodegradation of fluorene. Crude biosurfactant was produced from B. megaterium on mineral salt media (MSM) supplemented with either acetate ammonium (MSM-AA) or crude oil (MSM-CO) as sole carbon source. The B. megaterium showed the highest crude biosurfactant yield (2.99 ± 0.11 g L-1) when grown on MSM-AA, while a yield of 2.63 ± 0.04 g L-1 was found on MSM-CO. Biosurfactant activities were observed in both media with a 35.68 ± 1.05 and 28.48 ± 0.39 mN/m reduction in surface tension when using acetate ammonium and crude oil, respectively. FTIR spectroscopy showed that carbon substrates induce the same glycolipid classes for both MSM-AA and MSM-CO. The results clearly demonstrated that carbon substrates affect biosurfactant production in terms of yield, and that the increase of fluorene removal by approximately 1.5 and 2 compared to the control was due to the presence of the amended crude biosurfactant from MSM-AA and MSM-CO, respectively, after 28 days.

Science of The Total Environment, 2014

• n-alkanes, PAHs, PCBs and pesticides were analyzed in the Huveaune River sediments. • The use o... more • n-alkanes, PAHs, PCBs and pesticides were analyzed in the Huveaune River sediments. • The use of aliphatic and PAH diagnostic indices to assess hydrocarbon sources • Results in sediments showed inputs of terrestrial biogenic hydrocarbons together with anthropic contribution. • The high level of several compounds represents an ecological risk. • The results can be used as a recommendation for a better "ecological governance".

Research in Microbiology, 2006

This in vitro study was conducted in order to determine the effects of hydrocarbons and growth ph... more This in vitro study was conducted in order to determine the effects of hydrocarbons and growth phase on the phospholipid ester-linked fatty acid composition of two marine sedimentary hydrocarbon-degrading bacteria. These two strains, namely Corynebacterium sp. and Sphingomonas sp. 2MPII, were cultivated on either a simple soluble substrate (ammonium acetate) or a hydrocarbon (respectively n-eicosane and phenanthrene). The incubations were stopped at different times corresponding to point of lag (2 days), exponential (7 days) and stationary phases (21 and 56 days). The effects of growth phase and hydrophobic substrates were successfully demonstrated by a simple index, given as the sum of saturated fatty acids divided by the sum of unsaturated fatty acids (SFA/ MUFA), ranging from 1.4 to 3, 0.3 to 0.6, and 0.5 to 1.0 for Corynebacterium sp., Sphingomonas sp. 2MPII, and mixed cultures, respectively. This result was validated by a principal component analysis. In pure cultures, the phospholipid fatty acid (PLFA) composition was strongly influenced by both the carbon source and the growth phase. Nevertheless, the two strains showed different "behaviors". For 2MPII, the main PLFA composition changes were observed at 2 days while they were progressive as a function of time for Corynebacterium sp. These differences could explain the evolution of PLFAs of mixed cultures.

Organic Geochemistry, 2006

Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation ... more Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation and phospholipid fatty acid (PLFA) composition in either non-contaminated (NC) or contaminated (C) sedimentary microcosms with a crude oil. An analytical procedure was developed to extract both hydrocarbons and PLFAs from the same culture. PLFAs were analyzed over time during an aerobic microcosm experiment (0–21 days) to obtain a better

Plant Ecology and Evolution, 2019

Background and aims – The present study aims to describe a new species of pennate blue diatom fro... more Background and aims – The present study aims to describe a new species of pennate blue diatom from the genus Haslea, H. nusantara sp. nov., collected from Semak Daun Island, the Seribu Archipelago, in Indonesian marine waters. Methods – Assessment for species identification was conducted using light microscopy, Scanning Electron Microscopy and molecular techniques. The morphological characteristics of H. nusantara have been described, illustrated and compared to other morphologically similar blue Haslea taxa, distributed worldwide. Additionally, molecular characterization was achieved by sequencing plastidial and mitochondrial genomes. Key results – This new species, named Haslea nusantara, cannot be discriminated by its morphology (stria density) but it is characterized by its gene sequences (rbcL chloroplast gene and cox1 mitochondrial gene). Moreover, it differentiates from other blue Haslea species by the presence of a thin central bar, which has been previously reported in non-...

Omni-Akuatika, Nov 29, 2017

Eastern part of Segara Anakan Lagoon (E-SAL) is an estuarine ecosystem to dispose industrial wast... more Eastern part of Segara Anakan Lagoon (E-SAL) is an estuarine ecosystem to dispose industrial waste i.e. lead (Pb) containing waste. The study aims to analysis the distribution of Pb in soil, water and mangrove vegetation matrices. Several parameters including bioaccumulation factor (BAF), translocation factor (TF), leaf morphometric (the effect of Pb for mangrove vegetation) were used to estimate their impact. We developed a pre-design of mangrove zone as a model in reducing Pb cntaminantion in E-SAL. The results showed the distribution of Pb in E-SAL was 0.177-0.233 mg/L (water), 0.320-0.780 mg/kg (soil), 4.80-8.67 mg/kg (mangrove root), 2.48-6.96 mg/kg (mangrove stem), and 1.48-4.76 mg/kg (mangrove leaf). The scoring of BAF in mangrove vegetation had value between 22.2-40.1 and TF between 0.9-1.3. The distribution of Pb in soil depths were 8.89 mg/kg (0-50 cm) to 0.56 mg/kg (150-200 cm). The impact of Pb was 2-60 % of leaf damage on surface leafs. The mangrove zone to reduce impact of Pb in E-SAL was Rhizophora apiculata, Bruguiera sexangula, Aegiceras corniculatum and Sonneratia caseolaris as mangrove species in the first zone.

Omni-Akuatika, 2015

Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-m... more Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-metalcontaminations in the sea. In this research, the concentrations of four elements Ni, Cu, Zn and Cd in P. viridis and in the serum of rat which orally feed by P. viridis were determined by Atomic Absorption Spectrometry (AAS) following dry acid digestion. Parameter analysis was evaluated by determining confidence limit for the obtained results. The result showed that there was a sequence of heavy-metal content in green mussels sample and laboratory rats serum, such as Ni < Cd…

Environmental Science and Pollution Research

IOP Conference Series: Earth and Environmental Science