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High-resolution magnetic investigation of hydrothermal circulation in the Danakil Depression
Hanjin Choe,Daniel Mege,Jerome Dyment 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
The Danakil Depression is an active divergent boundary opening between the southern Red Sea rift and the Afar triple junction at a rate of ~1 cm/yr. Despite its geological interest, it is becoming increasingly difficult to study due to regional political instability and extreme environment. Our study area, located between the Erta ‘Ale volcano and Dallol, exhibits thick salt layers and iron-rich clay interbeds locally covered by mud volcanism deposits. Heat from the volcanic rift segment and the occasional saltwater influx from Lake Karum create a unique hydrothermal system on land. In 2019 we collected ground magnetic field data around the main active hydrothermal fissure to investigate the magnetic signature of this hydrothermal system. Our data show a clear linear magnetic anomaly low associated with the fissure, indicating a loss of magnetization due to the active hydrothermal activity. Local anomaly lows are observed at hydrothermal pools and in areas of subsurface bubbling. Apart from the hydrothermal areas, a relatively uniform magnetic anomaly is observed above the resurfaced reddish mud. Its slow decay away from the fissure may correspond to the progressive attenuation of the superficial iron-rich mud layer considered as the most likely coherent magnetized source in the area. Our inference of the iron-rich mud layer as the bearer of a coherent magnetization that is altered by the hydrothermal activity needs however to be confirmed by sample analyses.
Oua?ssi, Mehdi,Studer, Anne-Sophie,Mege, Diane,Thuny, Franck,Boiron, Laurence,Loundou, Anderson,Pirr?, Nicolas,Hamed, Samy,Frasconi, Cecilia,Habib, Gilbert,Fournier, Pierre-Edouard,Collart, Fr?deric,S Potamitis Press 2014 Anticancer research Vol.34 No.1
<P>Association between streptococcal endocarditis and gastrointestinal disease has been well-documented in the literature. However oncological impact of this complicated presentation has not yet been reported. We have conducted to our knowledgethe first case-control study on this subject.</P>
Mohamed Hassan El-Newehy,Salem Slayyem Al-Deyab,Rajkumar Nirmala,Ahmed Abdel-Megeed,Hak Yong Kim 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
Electrospun nylon-6/chitosan (nylon-6/Ch) nanofibers were prepared by nanospider technology. Quaternary ammonium salts as antibacterial agent were immobilized onto electrospun nylon-6/Ch nanofibers via surface modification by soaking the mat in aqueous solution of glycidyltrimethylammonium chloride (GTMAC) at room temperature overnight to give nylon-6/N-[(2-hydroxy-3-trimethylammonium)propyl] chitosan chloride (nylon-6/HTCC). The morphological,structural and thermal properties of the nylon-6/ch nanofibers were studied by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, and thermogravimetric analysis (TGA). Biological screening has demonstrated the antibacterial activity of the electrospun nanofibers against Gram negative bacteria, Escherichia coli 35218, and Pseudomonas aeruginosa and Gram positive bacteria,Staphylococcus aureus 24213 among the tested microbes. Thus, the study ascertains the value of the use of electrospun nanofibers, which could be of considerable interest to the development of new antibacterial materials for biomedical applications.