• Title/Summary/Keyword: Red Sea

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The calibration of a laser profiling system for seafloor micro-topography measurements

  • Loeffler, Kathryn R.;Chotiros, Nicholas P.
    • Ocean Systems Engineering
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    • v.1 no.3
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    • pp.195-205
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    • 2011
  • A method for calibrating a laser profiling system for seafloor micro-topography measurements is described. The system consists of a digital camera and an arrangement of six red lasers that are mounted as a unit on a remotely operated vehicle (ROV). The lasers project as parallel planes onto the seafloor, creating profiles of the local topography that are interpreted from the digital camera image. The goal of the calibration was to determine the plane equations for the six lasers relative to the camera. This was accomplished in two stages. First, distortions in the digital image were corrected using an interpolation method based on a virtual pinhole camera model. Then, the laser planes were determined according to their intersections with a calibration target. The position and orientation of the target were obtained by a registration process. The selection of the target shape and size was found to be critical to a successful calibration at sea, due to the limitations in the manoeuvrability of the ROV.

Evaluation of Head and Neck Cancer Awareness and Screening Status in Jeddah, Saudi Arabia

  • Alhazzazi, Turki Y
    • Asian Pacific Journal of Cancer Prevention
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    • v.17 no.3
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    • pp.1135-1139
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    • 2016
  • Background: Head and neck cancer (HNC) is one of the deadliest cancers worldwide. Early detection is a key determinant of HNC prognosis. Hence, raising awareness of this disease may improve survival rates. The present study evaluated the level of awareness and screening status for HNC in the general population of Jeddah, Saudi Arabia. Materials and Methods: An e-questionnaire was distributed during our HNC awareness campaign at the Red Sea Mall in Jeddah. The questions assessed HNC knowledge and screening status among participants. Results: Of the 112 respondents, 68% indicated that they had no knowledge of HNC. Social media was the major source of information (39%) for respondents. The majority (40%) believed that it was the joint responsibility of dentists, dental hygienists, and general physicians to screen for HNC; 82% had never been screened. Conclusions: Knowledge and awareness of HNC must be increased in the general population and among dental health professionals.

The conspecificity of Pterosiphonia spinifera and P. arenosa (Rhodomelaceae, Ceramiales) inferred from morphological and molecular analyses

  • Bustamante, Danilo E.;Won, Boo Yeon;Cho, Tae Oh
    • ALGAE
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    • v.31 no.2
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    • pp.105-115
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    • 2016
  • The genus Pterosiphonia includes twenty-one currently described species of red algae that occur in temperate to tropical regions of the Atlantic and Pacific Oceans. Pterosiphonia spinifera was originally described as Polysiphonia spinifera from Peru and later transferred to Pterosiphonia. Pterosiphonia spinifera has been reported from Peru as Pterosiphonia pennata, which was originally described from the Mediterranean Sea. Recently, Pterosiphonia arenosa was described based on specimens of P. pennata from Korea. We collected P. spinifera along the coast of Peru and P. arenosa near the type locality in Korea. We compared them with the isotype specimens of P. arenosa using both morphological and molecular data. Our morphological observations and our phylogenetic analysis of rbcL sequences demonstrate that P. spinifera and P. arenosa are conspecific and indicate that P. arenosa is a later synonym of P. spinifera. Our study confirms the wide occurrence of P. spinifera in the western and eastern Pacific Ocean.

The Indian Ocean Scenario in the 14th Century Latin Crusade Tract: Possibilities of a World Historical Approach

  • Chakravarti, Ranabir
    • Asian review of World Histories
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    • v.3 no.1
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    • pp.37-58
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    • 2015
  • The paper examines, in the light of current historiography, the recent trends in the application and applicability of the World Historical studies on the Indian Ocean scenario. Calling for the combination of the breadth of the World Historical studies with the analysis of a historical scenario in its specific spatio-temporal context-instead of a synchronic approach-the present study takes a close look at commerce and politics in the western Indian Ocean in the light of an early 14th century Latin Crusade tract, How to Defeat the Saracens by William of Adam (Guillelmus Ade, Tractatus quomodo Sarraceni sunt expugnandi), a Dominican friar. The text offers remarkable insights into the interlocking of the Indian Ocean and the South Asian subcontinent with the Mamluk Sultanate, the Ilkhanid realm and the Crusades. The paper argues for what is now termed as braided and connected histories.

Determining Optimal Processing Conditions for Flounder Verasper moseri Jordan et Gilbert Sikhe using Response Surface Methodology (반응표면분석법을 이용한 가자미(Verasper moseri Jordan et Gilbert) 식해 제조 최적화)

  • Han, Dae-Won;Kim, Deog-Gi;Han, Ho-Jun;Cho, Soon-Yeong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.48 no.1
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    • pp.36-43
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    • 2015
  • We examined sensory characteristics to determine the optimal conditions for flounder Verasper moseri Jordan et Gilbert sikhe preparation, using response surface methodology. Our aim was to develop the optimum mixing rates and materials for producing highly palatable flounder sikhe. The optimal fermentation temperature, salt concentration, and fermentation period for preparing flounder sikhe of acceptable quality were $11.63^{\circ}C$, 4.66% and 9.12 days, respectively. The optimal percentages of red pepper powder, garlic, monosodium glutamate, ginger, radish and foxtail millet were 16.08%, 7.21%, 2.96%, 3.70%, 10.12% and 13.72% respectively.

Studies on the Anti-Inflammatory and Analgesic Effects of Extracts from Marine Sponges

  • Fakhr, Issa M.I.;Hamdy, Nehal A.;Radwan, Mohamed A.A.;El-Batran, Seham A.;Shabrawy, Osama A. El
    • Natural Product Sciences
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    • v.12 no.2
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    • pp.74-78
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    • 2006
  • Two specimens of sponges collected from Red Sea, Egypt, were investigated for their contents of secondary metabolites. The crude extracts of the sponges were tested for their anti-inflammatory and analgesic effects. The toxic effects of the extracts of the two marine sponges were studied. $LD_{50}$ determination revealed that the investigated extracts of 'Igernella and Ircinia spp' were 4.69 and 134.7 mg/l00 g b.wt., respectively, when injected intraperitoneally in mice. The toxic signs were recorded within the first 24 hrs after injection. Also the two marine sponges extracts showed significant anti-inflammatory and analgesic effects.

Diversity of Keratinophilic Fungi on Human Hairs and Nails at Four Governorates in Upper Egypt

  • Gherbawy Youssuf A.M.H.;Maghraby Thanaa A.;El-Sharony Hassan M.;Hussein Mohmaed A.
    • Mycobiology
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    • v.34 no.4
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    • pp.180-184
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    • 2006
  • The mycobiota of 160 hair and nail samples collected from 4 different governorates in upper Egypt were estimated using soil plate method for isolating keratinophilic and dermatophytic fungi. Twenty-three fungi were recorded on both hair and nail samples collected from the four governorates. Highest fungal diversity (20) was collected from Red Sea samples followed by Qena (18) and Aswan (17) while lowest fungal diversity was recorded from Sohage samples. The common genera were Aphanoascus, Aspergillus, Penicillium, Paecilomyces and Chrysosporium. The most prevalent species belonging to these genera were: A. fulvescens, Aphanoascus sp. A. flavus link, A. flavus var. columnaris, P. chrysogenium. P. lilacinus and C. sulfureum. True dermatophytes such as Nannizzia fulva appeared in $20{\sim}30%$ of the male samples.

A Study of Dyeability at Low Temperature on the Ultra-microfiber (해도사의 저온염색성에 대한 고찰)

  • 장지은;강민주;최재홍
    • Textile Coloration and Finishing
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    • v.16 no.3
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    • pp.8-13
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    • 2004
  • This research aimed at scrutinizing the comparative dyeability of some disperse dyes at low temperature on ultra-microfiber polyester, islands in the sea type (0.05 denier), which has claimed utmost fastness and improved uptake of dyeing. Comparisons of dyeability, such as rate of dyeing and color depth, on ultra-microfiber polyester were evaluated by H.T. exhaust dyeing method and followed by the test of rubbing fastness. To achieve high wet fastness, some commercial disperse dyes, Terasil WW and Megacron dyes, which have been recently launched for excellent wash fastness, have been examined compared with conventional disperse dyes, C.I Disperse Red 167 and C.I Disperse Orange 30.

Study on monitoring and prediction for the occurrence of red tide in the middle coastal area in the South Sea of Korea (원격탐사를 이용한 한국 남해 중부해역에서의 적조 예찰 연구 1. 적조발생과 기상인자간의 상관성 연구)

  • 윤홍주;김승철;윤양호;김상우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.333-337
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    • 2002
  • 남해 중부해역에서 적조발생과 관련해서 기상인자와의 상관성을 요약하면 다음과 같다. 적조 다발 월 비교에서 강수량이 적조 발생과 밀접한 상관을 보였다. 즉, 강수량은 육지 및 연안지역의 영양염류를 해역으로 유입시킴으로서 적조발생의 영양 공급원으로 중요한 역할을 한다. 이때의 기온은 대체로 적조 다발철인 여름과 초가을에 높은 값을 유지했다. 그러나 일조시수나 바람은 적조발생에 직접적인 연관성을 가지지는 않은 것으로 사료된다.

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Study on monitoring and prediction for the occurrence of red tide in the middle coastal area in the South Sea of Korea II: (원격탐사를 이용한 한국 남해 중부해역에서의 적조 예찰 연구 II: 적조발생과 해양인자간의 상관성 연구)

  • 윤홍주;김승철;김영섭;김상우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.505-509
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    • 2002
  • 남해 중부해역에서 적조발생과 관련해서 적조 다발월인 여름과 초가을에 기온과 마찬가지로 높은 수온을 유지한다. 또한 많은 강수량에 의하여 부유물질 및 영양염류가 증가하고 염분이 대체로 떨어지는 것을 알 수 있었다. 이때 적조의 bloom으로 인하여 대표적인 영양염류인 질소와 인의 값이 떨어진다. 그리고 적조생물의 사후 미생물 분해 작용이 활발하여 산소의 소모가 증가하여 용존산소가 급격히 떨어지고 화학적산소요구량이 높게 나타나는 것을 알 수 있었다. 즉, 해양인자와의 상관성은 적조의 발생조건인 수온이 적당하며 저염분과 부유물질, 클로로필, 질소, 인이 높게 나타났고 용존산소는 적조생물의 인해 낮게 나타났음을 알수 있었다.

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