35 research outputs found
Removal Efficiency of Textile Dyes from Aqueous Solutions Using Calcined Waste of Eggshells as Eco-friendly Adsorbent: Kinetic and Thermodynamic Studies
This research investigates the removal of textile dyes (Rhodamine B and Alizarin Red S) from aqueous solution by a low-cost adsorbent prepared from eggshell waste.
Batch adsorption experiments were conducted in order to determine the effect of different parameters such as pH, dye concentration, contact time, adsorbent dosage, particle size, and temperature. The best correlation was found by Langmuir model, and the maximum adsorption capacity was 175.58 mg gâ1 for Rhodamine B and 156.56 mg gâ1 for Alizarin Red S. Thermodynamic studies showed that the adsorption of Rhodamine B and Alizarin Red S were feasible, spontaneous, and exothermic in nature. Regeneration study conducted to test the reusability (five cycles) and comparison of adsorption capacities of Rhodamine B and Alizarin Red S showed that calcined eggshell adsorbent could potentially be used for the removal of dyes from aqueous solutions.
This work is licensed under a Creative Commons Attribution 4.0 International License
Salinité et pollution par les nitrates des eaux souterraines de la plaine des Triffa
Les eaux souterraines de la plaine des Triffa (Basse Moulouya) deviennent de plus en plus polluĂ©es. Les rĂ©sultats analytiques montrent que la plupart des puits sont chargĂ©s en sels et en nitrates, donc impropres Ă la consommation humaine et peuvent avoir un effet nĂ©gatif sur les cultures maraĂźchĂšres de la rĂ©gion. Dans la zone Ă©tudiĂ©e, des teneurs de 2,32 Ă 174,70 mg/l de NO3-, de 134 Ă 3614 mg/l de Cl- et de 103 Ă 1518 mg/l de Na+ ne sont pas exceptionnelles. Elles dĂ©passent largement les normes fixĂ©es par lâOMS et la CEE (50 mg/l pour les NO3 -, de 250 mg/l pour Cl- et de 175 mg/l pour Na+). Lâintensification de lâagriculture dans la plaine, notamment dans les pĂ©rimĂštres irriguĂ©s, lâĂ©pandage excessif des engrais, les applications rĂ©pĂ©tĂ©es, et Ă quantitĂ©s fortes, de fumiers, lâirrigation, les prĂ©cipitations et la remontĂ©e de la nappe dans certaines rĂ©gions ont engendrĂ© une pollution croissante des ressources en eau
Engineered LINE-1 retrotransposition in nondividing human neurons
Half the human genome is made of transposable elements (TEs), whose ongoing activity continues to impact our genome. LINE-1 (or L1) is an autonomous non-LTR retrotransposon in the human genome, comprising 17% of its genomic mass and containing an average of 80-100 active L1s per average genome that provide a source of inter-individual variation. New LINE-1 insertions are thought to accumulate mostly during human embryogenesis. Surprisingly, the activity of L1s can further impact the somatic human brain genome. However, it is currently unknown whether L1 can retrotranspose in other somatic healthy tissues or if L1 mobilization is restricted to neuronal precursor cells (NPCs) in the human brain. Here, we took advantage of an engineered L1 retrotransposition assay to analyze L1 mobilization rates in human mesenchymal (MSCs) and hematopoietic (HSCs) somatic stem cells. Notably, we have observed that L1 expression and engineered retrotransposition is much lower in both MSCs and HSCs when compared to NPCs. Remarkably, we have further demonstrated for the first time that engineered L1s can retrotranspose efficiently in mature nondividing neuronal cells. Thus, these findings suggest that the degree of somatic mosaicism and the impact of L1 retrotransposition in the human brain is likely much higher than previously thought.We thank current members of the J.L.G.-P. laboratory for helpful discussions. We also thank Drs. Geoffrey Faulkner (Mater Research, Australia) and John V. Moran (University of Michigan) for sharing unpublished data and for critical input during the project; Ms. Raquel Marrero (Microscopy Unit, Genyo) for technical support; Simon Mendez-Ferrer (CNIC, Spain) for providing total RNA isolated from human mesenspheres; Dr. Oliver Weichenrieder (Max-Planck, Tubingen, Germany) for providing a polyclonal L1-ORF1p antibody; and Dr. Aurelien Doucet (IRCAN, Nice, France) for providing a plasmid containing an UBC-driven EGFP retrotransposition indicator cassette. J.L.G. was funded by the US Department of Defense, Breast Cancer Research Program (award #BC051386), the National Institutes of Health (NIH) National Institute of Neurological Disorders and Stroke (1R03NS087290-01), and the ALS Therapy Alliance (2013-F-067). A.M. has been partially funded by a Marie Curie IRG project (FP7-PEOPLE-2007-4-3-IRG: SOMATIC LINE-1). J.L.G.-P's laboratory is supported by CICE-FEDER-P09-CTS-4980, CICE-FEDER-P12-CTS-2256, Plan Nacional de I+D+I 2008â2011 and 2013â2016 (FIS-FEDER-PI11/01489 and FIS-FEDER-PI14/02152), PCIN-2014-115-ERA-NET NEURON II, the European Research Council (ERC-Consolidator ERC-STG-2012-233764), by an International Early Career Scientist grant from the Howard Hughes Medical Institute (IECS-55007420), and by The Wellcome TrustâUniversity of Edinburgh Institutional Strategic Support Fund (ISFF2).S
Empirical investigation to explore potential gains from the amalgamation of Phase Changing Materials (PCMs) and wood shavings
The reduction of gained heat, heat peak shifting and the mitigation of air temperature fluctuations are some desirable properties that are sought after in any thermal insulation system. It cannot be overstated that these factors, in addition to others, govern the performance of such systems thus their effect on indoor ambient conditions. The effect of such systems extends also to Heating, Ventilation and Air-conditioning (HVAC) systems that are set up to operate optimally in certain conditions. Where literature shows that PCMs and natural materials such as wood-shavings can provide efficient passive insulation for buildings, it is evident that such approaches utilise methods that are of a degree of intricacy which requires specialist knowledge and complex techniques, such as micro-encapsulation for instance. With technical and economic aspects in mind, an amalgam of PCM and wood-shavings has been created for the purpose of being utilised as a feasible thermal insulation. The amalgamation was performed in the simplest of methods, through submerging the wood shavings in PCM. An experimental procedure was devised to test the thermal performance of the amalgam and compare this to the performance of the same un-amalgamated materials. Comparative analysis revealed that no significant thermal gains would be expected from such amalgamation. However, significant reduction in the total weight of the insulation system would be achieved that, in this case, shown to be up to 20.94%. Thus, further reducing possible strains on structural elements due to the application of insulation on buildings. This can be especially beneficial in vernacular architectural approaches where considerably large amounts and thicknesses of insulations are used. In addition, cost reduction could be attained as wood shavings are significantly cheaper compared to the cost of PCMs
La cause peu frĂ©quente de la douleur pelvienne aiguĂ« : la torsion de lâhydrosalpinx isolĂ©e
Isolated torsion of hydrosalpinx is a rare cause of acute pelvic pain.
Pre-operative diagnosis is very difficult because of non specific
clinical presentation. Definitive diagnosis is always made at surgical
exploration performed for suspected adnexal torsion and salpingectomy
is performed in the majority of cases. A 34-year-old woman was admitted
for acute pelvic pain with nausea and vomiting. Vaginal examination
revealed a right adnexal tender mass and ultrasound revealed a well
circumscribed right adnexal cystic mass. Surgical exploration has
revealed torsion of a right hydrosalpinx and right salpingectomy was
performed. Differential diagnosis between adnexal and tubal torsion is
very difficult, however both should be managed by rapid surgical
exploration which an allow precocious diagnosis and conservative
treatment (Afr J Reprod Health 2009; 13[4]:147-150).La torsion de lâhydrosalpinx isolĂ©e est un cause rare de la
douleur pelvienne aiguë. Le diagnostic préchirurgical est
trĂšs difficile Ă cause dâune absence dâune
présentation clinique spécifique. On fait un diagnostic
dĂ©finitif pendant lâexploration chirurgicale pratiquĂ©e
pour détecter une torsion annexielle et pour la majorité des
cas câest la salpingectomie qui est pratiquĂ©e. Une femme
ĂągĂ©e de 34 ans a Ă©tĂ© admise Ă
lâhĂŽpital Ă cause dâune douleur pelvienne
aiguë accompagnée de la nausée et du vomissement. Un
examen vaginal a rĂ©vĂšle une masse sensible dâannexiel
droit et lâultrason a rĂ©vĂ©lĂ© une masse Kystique de
lâannexiel droit bien circonscrite. Une exploration chirurgicale
a rĂ©vĂšle une torsion de lâhydrosalpinx droit et nous
avons pratiqué la salpingectonie. Le diagnostic différentiel
entre lâannexiel et la torsion tubaire est trĂšs difficile,
néanmoins il faut traiter les deux à travers
lâexploration chirurgicale rapide qui peut permettre un
diagnostic précoce et un traitement conservateur (Afr J Reprod
Health 2009; 13[4]:147-150)
New lacustrine records from the Moroccan Middle Atlas
International audienc