Journal of Marine Science and Technology最新文献_第9页

UXO Assessment on the Romanian Black Sea Coast 罗马尼亚黑海沿岸未爆弹药评估

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-06-13 DOI: 10.30564/jms.v4i2.4497

Laurențiu-Florin Constantinoiu, E. Rusu, Maria Emanuela Mihailov

引用次数: 3

Agarase Production by Marine Pseudoalteromonas sp. MHS: Optimization, and Purification 海洋假互生单胞菌产琼脂酶MHS:优化与纯化

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-24 DOI: 10.30564/jms.v4i1.3875

Mona M. Sharabash, Samia S. Abouelkheir, Mona E. M. Mabrouk, H. Ghozlan, S. Sabry

{"title":"Agarase Production by Marine Pseudoalteromonas sp. MHS: Optimization, and Purification","authors":"Mona M. Sharabash, Samia S. Abouelkheir, Mona E. M. Mabrouk, H. Ghozlan, S. Sabry","doi":"10.30564/jms.v4i1.3875","DOIUrl":"https://doi.org/10.30564/jms.v4i1.3875","url":null,"abstract":"Agar is an essential polysaccharide that has been utilized in numerous fields. Many kinds of literature have been published regarding agarolytic microorganisms’ isolation and agarases biochemical studies. In this search, a local marine agarolytic bacterium associated with marine alga Ulva lactuca surface was isolated and identified as Pseudoalteromonas sp. MHS. The agarase production was parallel to the growth of Pseudoalteromonas sp. MHS as cells displayed a lag phase (2 h), subsequently an exponential growth that prolonged till 10 h where maximum growth (OD550nm = 3.9) was achieved. The enzyme activity increased rapidly as cells increased exponentially where the maximum activity of 0.22 U/mL was achieved after 8h and remained constant till 12 h during the stationary phase of growth. Agarase production was optimized using Plackett-Burman statistical design by measuring enzyme activity as a response and the design was validated using a verification experiment; the activity of the enzyme increased from 0.22 U/mL to 0.29 U/mL. Pseudoalteromonas sp. MHS agarase was partially purified and its molecular weight (MW) was determined by SDSPAGE (15-25 kDa). Agarase showed approximately 94% of its activity at 40 °C. The enzyme stability decreased as the temperature increased; the enzyme could retain about 98, 90, 80, 75, and 60% of its activity at 20, 30, 40, 50, and 60 °C, respectively. Biomass of the red alga Pterocladia capillacea proved to be a suitable substrate for agarase production using Pseudoalteromonas sp. MHS; the enzyme activity recorded after 24 h of incubation was 0.35 U/mL compared to 0.29 U/mL from the optimized medium.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"25 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2022-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81478264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Climate Change Effects and Marine Renewable Energy Important Topics Targeted by the Journal of Marine Science 气候变化影响和海洋可再生能源《海洋科学杂志》瞄准的重要主题

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-21 DOI: 10.30564/jms.v4i1.4366

E. Rusu

引用次数: 1

Analysis of Shoreline Changes in Ikoli River in Niger Delta Region Yenagoa, Bayelsa State Using Digital Shoreline Analysis System (DSAS) 基于数字海岸线分析系统(DSAS)的尼日尔三角洲叶纳戈阿伊科利河岸线变化分析

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-12 DOI: 10.30564/jms.v4i1.4197

Egai Ayibawari Obiene, E. Rowland, Inko-Tariah Ibiso Michael

{"title":"Analysis of Shoreline Changes in Ikoli River in Niger Delta Region Yenagoa, Bayelsa State Using Digital Shoreline Analysis System (DSAS)","authors":"Egai Ayibawari Obiene, E. Rowland, Inko-Tariah Ibiso Michael","doi":"10.30564/jms.v4i1.4197","DOIUrl":"https://doi.org/10.30564/jms.v4i1.4197","url":null,"abstract":"The use of Digital Shoreline Analysis System was used to determine shoreline changes in Ikoli River, Yenagoa, Bayelsa State. Shoreline data were extracted from satellite imagery over thirty years (1991-2021). The basis of this study is to use Digital Shoreline Analysis System to determine erosion and accretion areas. The result reveals that the average erosion rate in the study area is 1.16 m/year and the accretion rate is 1.62 m/year along the Ikoli River in Ogbogoro Community in Yenagoa, Bayelsa State. The mean shoreline length is 5.24 km with a baseline length of 5.2 km and the area is classified into four zones to delineate properly area of erosion and accretion based on the five class of Linear regression rate, endpoint rate and weighted linear rate of which zone I contain very high erosion and high erosion with an area of landmass 255449.93 m2 of 38%, zone II contain moderate accretion, very high accretion and high accretion with a land area of 1666816.46 m2 with 24%, zone III has very high erosion and high erosion with an area of landmass 241610.85 m2 of 34 % and zone IV contain moderate accretion and high accretion with land area 30888.08 m2 with 4%. Out of the four zones, zone I and II were found to be eroding with 72% and zone II and IV contain accretion with 28%. The result shows that 44% of the area have been eroded. Therefore, coastal engineers, planners, and shoreline zone management authorities can use DSAS to create more appropriate management plans and regulations for coastal zones and other coastal parts of the state with similar geographic features.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"53 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2022-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80932686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards approval of autonomous ship systems by their operational envelope. 通过其操作范围批准自主船舶系统。

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2022-01-01 Epub Date: 2021-04-24 DOI: 10.1007/s00773-021-00815-z

Ørnulf Jan Rødseth, Lars Andreas Lien Wennersberg, Håvard Nordahl

{"title":"Towards approval of autonomous ship systems by their operational envelope.","authors":"Ørnulf Jan Rødseth, Lars Andreas Lien Wennersberg, Håvard Nordahl","doi":"10.1007/s00773-021-00815-z","DOIUrl":"https://doi.org/10.1007/s00773-021-00815-z","url":null,"abstract":"<p><p>Current guidelines for approval of autonomous ship systems are focused on the ships' concrete operations and their geographic area. This is a natural consequence of the link between geography and the navigational complexity, but moving the ship to a new area or changing owners may require a costly re-approval. The automotive industry has introduced the Operational Design Domain (ODD) that can be used as a basis for approval. However, the ODD does not include the human control responsibilities, while most autonomous ship systems are expected to be dependent on sharing control responsibilities between humans and automation. We propose the definition of an operational envelope for autonomous ship systems that include the sharing of responsibilities between human and automation, and that is general enough to allow approval of autonomous ship systems in all geographic areas and operations that falls within the envelope. We also show how the operational envelope can be defined using a system modelling language, such as the unified modelling language (UML).</p>","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"27 1","pages":"67-76"},"PeriodicalIF":2.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00773-021-00815-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38938174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Site Fidelity and Residency of Tursiops truncatus off the Aragua Coast, Venezuela-First Records of Long Residency 地点保真度和居住的Tursiops truncatus在阿拉瓜海岸，委内瑞拉-长期居住的第一个记录

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2021-10-31 DOI: 10.30564/jms.v3i4.3811

S. Cobarrubia-Russo, Sawyer I., M. Gómez-Alceste, A. Molero-Lizarraga

{"title":"Site Fidelity and Residency of Tursiops truncatus off the Aragua Coast, Venezuela-First Records of Long Residency","authors":"S. Cobarrubia-Russo, Sawyer I., M. Gómez-Alceste, A. Molero-Lizarraga","doi":"10.30564/jms.v3i4.3811","DOIUrl":"https://doi.org/10.30564/jms.v3i4.3811","url":null,"abstract":"This study represents the first comprehensive analysis of the residency patterns of a coastal population of bottlenose dolphin off the coast of Aragua, Venezuela, over a multi-year period. Using photo-identification, the most recent study (2019-2020) identified 56 individuals with the time between encounters from one to 344 days between the first and last sighting. Site Fidelity (SF) and Residence (RES) indices were calculated and Agglomerative Hierarchical Clustering (AHC) modeling was performed, with three patterns of residence obtained: resident (25%), semiresident (17.86%) and transient (57.14%). These results were contrasted with remodeled data from a previous study (2006-2007), showing similar patterns: resident (24.44%), semi-resident (28.89%) and transient (46.67%). Importantly, two individuals were found to have been resident over the extended period. A breeding female sighted for the first time in 2004 and again in 2020 (16 years) and the other from 2005 to 2020 (15 years). This region is an important area for marine mammals, known to support a resident reproductive population over many years, as well seabirds, sea turtles, whale sharks and fishermen. We recommend that consideration be given to designating the waters as a Marine Protected Area to safeguard the existing population and provide benefit to the surrounding marine environment.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"5 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80980418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mass Beach Stranding of Blue Button Jellyfishes, Porpita porpita (Linnaeus 1758) from the Coast of Mandvi, Kutch, India during August, 2021 2021年8月，印度库奇曼德维海岸的蓝纽扣水母(Porpita Porpita, Linnaeus 1758)在海滩搁浅

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2021-10-31 DOI: 10.30564/jms.v3i4.3851

Niki Shah, Yashesh Shah

引用次数: 0

Spatial Analysis of Maritime Piracy in the Gulf of Guinea 几内亚湾海盗的空间分析

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2021-10-29 DOI: 10.30564/jms.v3i4.3810

Jonathan Ejuvweyere Okpuvwie

引用次数: 2

Ocean Affects from Severe Weather Systems in Coastal Areas 沿海地区恶劣天气系统对海洋的影响

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2021-10-28 DOI: 10.30564/jms.v3i4.3772

J. Callaghan

引用次数: 0

Codon Usage of Chloroplast Gene rbcL in Laurencia sensu lato (Rhodophyta) species 月桂属植物叶绿体基因rbcL密码子的使用

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2021-09-28 DOI: 10.30564/jms.v3i4.3542

R. Cabrera, J. Díaz‐Larrea, Arsenio J. Areces, L. Ñúñez García, J. Cruz-Aviña, Gabriela Vázquez Silva

{"title":"Codon Usage of Chloroplast Gene rbcL in Laurencia sensu lato (Rhodophyta) species","authors":"R. Cabrera, J. Díaz‐Larrea, Arsenio J. Areces, L. Ñúñez García, J. Cruz-Aviña, Gabriela Vázquez Silva","doi":"10.30564/jms.v3i4.3542","DOIUrl":"https://doi.org/10.30564/jms.v3i4.3542","url":null,"abstract":"Recent advances in molecular biology make it possible to sequence not only genes or genomes, but also to understand codon dynamics. For the organelle genes of these organisms, a small set of preferred codons are used for encoding proteins. For the first time, this paper treats the divergence of synonymous codon usage and its bias in the rbcL gene within the Laurencia complex of red algae. We observed that the synonymous codon preference biases in rbcL are large and differ among species. A clear distinction in codon usage between genera is evident: the genera Dasya and Delesseria use a set that fluctuated between 53 and 58 codons. Whereas, in the genera Ceramium, Chondrophycus, Chlamydomonas, Chlorella, Laurencia s.s, Osmundea, and Palisada codon usage indicates a higher restriction fluctuating between 40 to 51 codons. Laurencia complex genera and other representative algae showed a defined composition pattern, with lower percentage values of NNC/G (7-24.9%). Dasya and Delesseria showed a selective pattern tendency because of high percentage values of NNC/G (54-55%). The estimated codon bias parameters were tested to infer systematic relationships and match suitable codons with the NNC / G codon percentages. Cluster analysis based on Codon Usage supports phylogenetic relationships between Chondrophycus, Palisada, Laurencia, Osmundea, and Yuzurua species.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"78 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2021-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83139186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1