Journal of Agricultural and Marine Sciences [JAMS]最新文献_第3页

Antimicrofouling activities of marine macroalga Dictyota dichotoma from the Red Sea 红海巨藻Dictyota dichotoma的抗菌活性

Journal of Agricultural and Marine Sciences [JAMS] Pub Date : 2019-01-10 DOI: 10.24200/JAMS.VOL23ISS0PP58-67

Alaa Aref Abdullah Gadhi, M. El-Sherbiny, A. Al-Sofyani, M. A. Ba-akdah, S. Satheesh

{"title":"Antimicrofouling activities of marine macroalga Dictyota dichotoma from the Red Sea","authors":"Alaa Aref Abdullah Gadhi, M. El-Sherbiny, A. Al-Sofyani, M. A. Ba-akdah, S. Satheesh","doi":"10.24200/JAMS.VOL23ISS0PP58-67","DOIUrl":"https://doi.org/10.24200/JAMS.VOL23ISS0PP58-67","url":null,"abstract":"Introduction. Marine organisms produce a variety of secondary metabolites mainly for achieving the defence against the competitors and predators. These compounds could be used as natural product antifoulants for the management of biofouling growth on marine structures. Objectives. To understand the antifouling defence strategies of marine macroalgae collected from the Red Sea. Methodology. The macroalga Dictyota dichotoma was collected from the Obhur Creek of Red Sea, Saudi Arabia and extracted using methanol. Surface and total extraction methods were performed and tested against a bacterial strain isolated from the microfouling assemblage. Results. The extracts obtained from the macroalgal samples have strong antibacterial and antibiofilm activities against the bacterial strain isolated from the marine microfouling assemblage. The total extracts showed strong bacterial growth inhibitory activities in culture plate method. In microtitre plate assay, surface extract showed strong biofilm inhibitory activity. GC-MS analysis indicated considerable variations in the metabolic profile of the surface and total extracts. Conclusion. This study revealed the importance of surface-associated compounds in antifouling defence mechanism of the marine macroalgae.","PeriodicalId":355315,"journal":{"name":"Journal of Agricultural and Marine Sciences [JAMS]","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130638968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Extraction of Natural Colors from Marine Algae 从海藻中提取天然色素

Journal of Agricultural and Marine Sciences [JAMS] Pub Date : 2019-01-10 DOI: 10.24200/JAMS.VOL23ISS0PP81-91

T. Alam

引用次数: 19

Impact of the Domestic Labor Market on Sustainability of Agriculture in Oman 国内劳动力市场对阿曼农业可持续性的影响

Journal of Agricultural and Marine Sciences [JAMS] Pub Date : 2019-01-10 DOI: 10.24200/JAMS.VOL23ISS0PP24-28

H. Kotagama, Hamam Al-Farsi

{"title":"Impact of the Domestic Labor Market on Sustainability of Agriculture in Oman","authors":"H. Kotagama, Hamam Al-Farsi","doi":"10.24200/JAMS.VOL23ISS0PP24-28","DOIUrl":"https://doi.org/10.24200/JAMS.VOL23ISS0PP24-28","url":null,"abstract":"Undistorted factor markets are a perquisite for efficient allocation of resources and growth in production. In Oman by 2013, only 16% of households have reported agriculture as the main occupation and 53% have reported nonagricultural government employment as the main occupation. This situation is hypothesized to be related to the labor market; where government legislated higher remuneration in the nonagricultural government sector vis-a-vis agricultural sector, influences Omani farmers to move to nonagricultural employment, causing reduced cultivated area and farm production. The study uses operations research methods to quantify the impact of labor market policies on agricultural employment, farm gross income and land use intensity (proxy for farm production and food security). It is found that the shift of Omani labor from agriculture is influenced by higher wages in the nonagricultural sectors. The agricultural land use intensity is thereby decreased. The policy of allowing hiring of expatriate labor is beneficial in overcoming labor scarcity. However, in the long-run both farm productivity need to improve to be competitive with legislated income receivable from nonagricultural employment and ideally labor markets need to operate freely, to enhance food security and assure employment of Omani labor in agriculture.","PeriodicalId":355315,"journal":{"name":"Journal of Agricultural and Marine Sciences [JAMS]","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122766082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Integrated aquaculture in arid environments 干旱环境下的综合水产养殖

Journal of Agricultural and Marine Sciences [JAMS] Pub Date : 2019-01-10 DOI: 10.24200/JAMS.VOL23ISS0PP52-57

S. Goddard, Fatma Saif Al-Abri

{"title":"Integrated aquaculture in arid environments","authors":"S. Goddard, Fatma Saif Al-Abri","doi":"10.24200/JAMS.VOL23ISS0PP52-57","DOIUrl":"https://doi.org/10.24200/JAMS.VOL23ISS0PP52-57","url":null,"abstract":"Around one third of the globe is classified as desert or arid (<200mm rain annually) and most such regions lack food security. Traditional freshwater aquaculture is often a marginal activity and competes with agriculture for limited water resources. Developing technologies offer new opportunities to increase productivity of aquaculture through integration with vegetable production in aquaponic systems and to reduce water requirements through the application of biofloc technology. Aquaponic systems combine aquaculture and hydroponic plant production and are integrated within a re-cycled water system. Fish waste metabolites provide the nutrients for plants grown in soil-less, hydroponic systems. Biofloc farming systems operate with minimum or zero water exchange. Suspended biofloc particles develop in fish tanks under conditions of full aeration and controlled carbon to nitrogen ratios. They comprise algae, bacteria, protozoa and particulate organic matter held in a loose matrix. They provide in-situ treatment of harmful fish metabolites, are protein rich, contain essential fatty acids, vitamins and minerals and supplement the diets of filter-feeding farmed species. The integration of fish culture with vegetable production provides new opportunities for small and medium enterprises. Integrated farms occupy a small footprint, optimise the use of resources and can be built close to population centres. This paper reviews current developments in aquaponics and biofloc technology against the background of food security needs in arid regions.","PeriodicalId":355315,"journal":{"name":"Journal of Agricultural and Marine Sciences [JAMS]","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129463429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6