Jean‐Charles Fontes, Roberto Gonfiantini,
... outlet in the North-Western Sahara (Gara Diba Guelta and el Melah Sebkha) has been studied. A ... process of these basins (4 months for the Guelta and 6 months for the Sebkha) showed a ... of the experimental values was developed for the Guelta evaporating water. It provided us with an estimate ...
Tópico(s): Water management and technologies
1967 - Elsevier BV | Earth and Planetary Science Letters
Cândida Gomes Vale, Stuart L. Pimm, José Carlos Brito,
... predictors of species number's present in each guelta through a multiple regression model. We ranked gueltas ... the percentage of endemics and threats to each guelta. Within a mere aggregate extent of 43 ha, ... respectively. The number of species present in each guelta increased with the primary productivity and area of ...
Tópico(s): Wildlife Ecology and Conservation
2015 - Public Library of Science | PLoS ONE
Laura Fancello, Sébatien Trape, Catherine Robert, Mickaël Boyer, Nikolay Popgeorgiev, Didier Raoult, Christelle Desnues,
... the local viral biodiversity in El Berbera, a guelta with sustained human activities, compared with the pristine ... the critically low water level experienced by the guelta.
Tópico(s): Viral gastroenteritis research and epidemiology
2012 - Springer Nature | The ISME Journal
... was unclear, B. macrops was collected in Bachikere guelta. The toad Amietophrynus regularis was collected in Ounianga ... incertain, B. macrops a été collecté dans la guelta de Bachikéré. Le crapaud Amietophrynus regularis a été ...
Tópico(s): Aquatic Ecosystems and Biodiversity
2013 - Elsevier BV | Comptes Rendus Biologies
... upper Jurassic and lower Cretaceous sequence in the Guelta wadi basin, northeastern Tunisia, includes a richly fossiliferous ...
Tópico(s): Paleontology and Stratigraphy of Fossils
1965 - EDP Sciences | BSGF – Earth Sciences Bulletin
Randall S. Wentsel, Mark A. Guelta,
Abstract Tests of the avoidance of brass powder (70% Cu, 30% Zn) contaminated soils by the earthworm Lumbricus terrestris at concentrations ranging from 0 to 200 μg/g were conducted. Avoidance was significant (p < 0.001) at brass concentrations as low as 38 μg/g. Avoidance was found to be a more sensitive indicator of the impact of brass powder on the worms than sublethal effects measured by weight loss.
Tópico(s): Invertebrate Taxonomy and Ecology
1988 - Wiley | Environmental Toxicology and Chemistry
... et-Tefla pools have become ephemeral. The Hamdoun guelta appears to be highly endangered. The fish populations ...
Tópico(s): Transboundary Water Resource Management
2009 - Public Library of Science | PLoS ONE
Mohamed Sahnouni, Jan van der Made, Melanie Everett,
... Beni Fouda intramontane basin, the Oued Boucherit area (Guelta Zerga, North East Algeria) hosts a unique succession ...
Tópico(s): Geology and Paleoclimatology Research
2009 - Elsevier BV | Quaternary International
Wieslaw Swietnicki, Daniel O. Carmany, Michael Retford, Mark A. Guelta, Russell Dorsey, Joel A. Bozue, Michael S. Lee, Mark A. Olson,
Yersinia pestis is a Gram negative zoonotic pathogen responsible for causing bubonic and pneumonic plague in humans. The pathogen uses a type III secretion system (T3SS) to deliver virulence factors directly from bacterium into host mammalian cells. The system contains a single ATPase, YscN, necessary for delivery of virulence factors. In this work, we show that deletion of the catalytic domain of the yscN gene in Y. pestis CO92 attenuated the strain over three million-fold in the Swiss-Webster mouse ...
Tópico(s): Escherichia coli research studies
2011 - Public Library of Science | PLoS ONE
Mohamed Sahnouni, Djillali Hadjouis, Jan van der Made, Abdelkader Derradji, Antoni Canals, Mohamed Medig, Hocine Bellahreche, Zoheir Harichane, Merouane Rabhi,
... Beni Fouda intramontane basin, the Oued Boucherit area (Guelta Zerga, North East Algeria) hosts a unique succession ...
Tópico(s): Evolution and Paleontology Studies
2004 - Elsevier BV | Journal of Human Evolution
Peng Li, Su‐Young Moon, Mark A. Guelta, Steven P. Harvey, Joseph T. Hupp, Omar K. Farha,
Immobilized enzymes typically have greater thermal and operational stability than their soluble form. Here we report that for the first time, a nerve agent detoxifying enzyme, organophosphorus acid anhydrolase (OPAA), has been successfully encapsulated into a water-stable zirconium metal–organic framework (MOF). This MOF features a hierarchical mesoporous channel structure and exhibits a 12 wt % loading capacity of OPAA. The thermal and long-term stabilities of OPAA are both significantly enhanced after ...
Tópico(s): Dendrimers and Hyperbranched Polymers
2016 - American Chemical Society | Journal of the American Chemical Society
Peng Li, Su‐Young Moon, Mark A. Guelta, Lu Lin, Diego A. Gómez‐Gualdrón, Randall Q. Snurr, Steven P. Harvey, Joseph T. Hupp, Omar K. Farha,
We report the synthesis and characterization of a water-stable zirconium metal-organic framework (MOF), NU-1003, featuring the largest mesoporous aperture known for a zirconium MOF. This material has been used to immobilize the nerve agent hydrolyzing enzyme, organophosphorus acid anhydrolase (OPAA). The catalytic efficiency of immobilized OPAA in nanosized NU-1003 is significantly increased compared to that of OPAA immobilized in microsized NU-1003 and even exceeds that of the free OPAA enzyme. This ...
Tópico(s): Dendrimers and Hyperbranched Polymers
2016 - American Chemical Society | ACS Nano
S.M. Bester, Mark A. Guelta, Jonah Cheung, Mark D. Winemiller, Su Y. Bae, James M. Myslinski, Scott D. Pegan, J.J. Height,
Over 50 years ago, the toxicity of irreversible organophosphate inhibitors targeting human acetylcholinesterase (hAChE) was observed to be stereospecific. The therapeutic reversal of hAChE inhibition by reactivators has also been shown to depend on the stereochemistry of the inhibitor. To gain clarity on the mechanism of stereospecific inhibition, the X-ray crystallographic structures of hAChE inhibited by a racemic mixture of VX (PR/S) and its enantiomers were obtained. Beyond identifying hAChE structural ...
Tópico(s): Pesticide Exposure and Toxicity
2018 - American Chemical Society | Chemical Research in Toxicology
S.M. Bester, Guelta, Jonah Cheung, Winemiller, Su Y. Bae, James M. Myslinski, Scott D. Pegan, J.J. Height,
Over 50 years ago, the toxicity of irreversible organophosphate inhibitors targeting human acetylcholinesterase (hAChE) was observed to be stereospecific. The therapeutic reversal of hAChE inhibition by reactivators has also been shown to depend on the stereochemistry of the inhibitor. To gain clarity on the mechanism of stereospecific inhibition, the X-ray crystallographic structures of hAChE inhibited by a racemic mixture of VX (P R/S) and its enantiomers were obtained. Beyond identifying hAChE ...
Tópico(s): Pesticide Exposure and Toxicity
2018 - American Chemical Society | Chemical Research in Toxicology
Mathieu Duval, Mohamed Sahnouni, Josep M. Parés, Jan van der Made, Salah Abdessadok, Zoheir Harichane, Razika Chelli-Cheheb, Kamel Boulaghraif, Alfredo Pérez‐González,
... Beni Fouda intramontane basin, the Oued Boucherit area (Guelta Zerga, North East Algeria) hosts a unique succession ...
Tópico(s): Geology and Paleoclimatology Research
2021 - Elsevier BV | Quaternary Science Reviews
Randall S. Wentsel, Mark A. Guelta,
Abstract The earthworm Lumbricus terrestris was exposed to brass powder (70% Cu, 30% Zn) contaminated soils at concentrations ranging from 0 to 430 μg/g. A 14-d LC50 of 190 μg/g with 95% fiducial limits of 169 and 220 μg/g was determined. Sublethal effects, measured as weight loss, were significantly different (p < .05) from the control at 120 μg/g and above.
Tópico(s): Invertebrate Taxonomy and Ecology
1987 - Wiley | Environmental Toxicology and Chemistry
Hugh R. Carlon, Mark A. Guelta, Bernard V. Gerber,
For many decades dioctyl phthalate (DOP), a common industrial material, has been used by the U.S. Army and other agencies to simulate aerosol behavior in nondestructive gas mask and filter serviceability testing, and for related test purposes. Techniques are completely standardized. But DOP is now considered to be a potentially hazardous material. The research reported here, which was performed using ATI Q-127 and TDA-100 “hot smoke” aerosol penetrometer test machines, identified relatively innocuous, ...
Tópico(s): Engineering and Material Science Research
1991 - Taylor & Francis | Aerosol Science and Technology
... and one without fish, zooplankton migrated vertically.The guelta with fish had a very impoverished zooplankton, mainly ... copepods.They showed a strong diurnal migration.The guelta without fish had Daphnia, Asplanchna, and the fairy ...
Tópico(s): Transboundary Water Resource Management
2019 - | Limnetica
... Groundwater samples collected in the vicinity of one guelta contained Syncarida, Isopoda, and Copepoda. Among the latter, ...
Tópico(s): Aquatic Ecosystems and Phytoplankton Dynamics
2015 - Q15088586 | Zootaxa
Tópico(s): Language, Linguistics, Cultural Analysis
1973 - Spanish National Research Council | Trabajos de Prehistoria
... the Sahara desert. One species, from a freshwater guelta on the south flanks of the Tibesti (D. ...
Tópico(s): Marine Invertebrate Physiology and Ecology
2014 - Q15088586 | Zootaxa
Bouchiba Guelta, Redouane Tlemsani, Samira Chouraqui, Mohamed Benouis,
This paper presents multi-modal biometric authentication approach using gait and electrocardiogram (ECG) signals, which can diminish the drawback of unimodal biometric approach as well as to improve authentication system performance.In acquisition phase, data sets are collected from three different databases, ECG-ID, MIT-BIH Arrhythmia database and UCI Machine Learning Repository (Gait).In Feature extraction phase of both signals (ECG and Gait) is performed by using 1D-local binary pattern.Features ...
Tópico(s): Non-Invasive Vital Sign Monitoring
2019 - Intelligent Networks and Systems Society | International journal of intelligent engineering and systems
J.R. McGuire, S.M. Bester, Mark A. Guelta, Jonah Cheung, Caroline Langley, Mark D. Winemiller, Sue Y. Bae, Vanessa L. Funk, James M. Myslinski, Scott D. Pegan, J.J. Height,
The recent use of organophosphate nerve agents in Syria, Malaysia, Russia, and the United Kingdom has reinforced the potential threat of their intentional release. These agents act through their ability to inhibit human acetylcholinesterase (hAChE; E.C. 3.1.1.7), an enzyme vital for survival. The toxicity of hAChE inhibition via G-series nerve agents has been demonstrated to vary widely depending on the G-agent used. To gain insight into this issue, the structures of hAChE inhibited by tabun, sarin, ...
Tópico(s): Computational Drug Discovery Methods
2021 - American Chemical Society | Chemical Research in Toxicology
Ibrahim Elkhalil Behmene, Bachir Bouiadjra Benabdallah, Mohamed Daoudi,
... Mudfish Clarias anguillaris (Linnaeus, 1758) (Siluriformes Clariidae), to Guelta Ifni (Illizi) an integral part of the Tassili ...
Tópico(s): Aquatic Ecosystems and Biodiversity
2020 - Edizioni Danaus, Palermo | BIODIVERSITY JOURNAL
Shengnan Zhou, Danyou Hu, Zhirui Fang, Guiyang Zhang,
... Crossref, Medline, Google Scholar11. Li P, Moon SY, Guelta MA, Harvey SP, Hupp JT, Farha OK. Encapsulation ...
Tópico(s): Luminescence and Fluorescent Materials
2021 - Future Medicine | Nanomedicine
Alain Thiéry, D. Christopher Rogers,
... is described from a temporary water body, or guelta, in the Sahara Desert near the Tadrart mountains, ...
Tópico(s): Marine Biology and Ecology Research
2022 - Oxford University Press | Journal of Crustacean Biology
A guelta is a small body of water that accumulates in the wadis, or drainage channels of the Sahara ... ways, such as mapping the size of a Guelta or predicting where water will flow during devastating ... this paper we review published work that combined Guelta determination with GIS or remote sensing technology. The ... on surface water detection (wetlands) and applied to Guelta research.
Tópico(s): Historical and Architectural Studies
2023 - Associação Interciencia | Interciencia
Joseph DeFrank, Mark A. Guelta, Steven P. Harvey, Ilona J. Fry, James P. Earley, F. Stephen Lupton,
Tópico(s): Pesticide Exposure and Toxicity
2000 - Springer Nature (Netherlands) | NATO science series. Partnership sub-series 1, Disarmament technologies
... at Amsterdam, Amsterdam, The Netherlands. 9 Wentsel R, Guelta M. 1988. Avoidance of brass powder-contaminated soil ...
Tópico(s): Insect and Arachnid Ecology and Behavior
1998 - Wiley | Environmental Toxicology and Chemistry
Samir Belmahi, Mohamed Zidour, Haddi Abdelkader,
... the control mortar based on quarry sand from Guelta, Algeria, so, the mixture of 30 to 50% ...
Tópico(s): Materials Engineering and Processing
2020 - National Council for Scientific Research | Lebanese Science Journal