156 research outputs found
Umbilical hernia in children in a developing country: Does the season have an effect on the occurrence of strangulation?
No Abstract
Composition chimique et propriĂ©tĂ©s antibactĂ©riennes des huiles essentielles dâOcimum basilicum et dâHyptis suaveolens (L.) Poit rĂ©coltĂ©s dans la rĂ©gion de Dakar au SĂ©nĂ©gal
Les huiles essentielles des feuilles dâOcimum basilicumet dâHyptis suaveolens, rĂ©coltĂ©es dans la rĂ©gion de Dakar au SĂ©nĂ©gal ont Ă©tĂ© extraites par entraĂźnement Ă la vapeur et analysĂ©es en CPG et CPG-SM. Les monoterpĂšnes oxygĂ©nĂ©s dont lâestragol (38,78 %), le linalol (19,45 %) et le mĂ©thyl-eugĂ©nol (9,98 %) sont majoritaires dans lâhuile essentielle dâO. basilicum. Ils sont suivis dâun sesquiterpĂšne hydrocarbonĂ©: le bergamotĂšne (8,48 %). Par contre, lâhuile essentielle de H. suaveolensest essentiellement constituĂ©e de composĂ©s hydrocarbonĂ©s: le ÎČ-caryophyllĂšne (16,63 %), le sabinĂšne (11,30 %), le terpinolĂšne (8,58 %), le limonĂšne (8,45 %) et le bergamotĂšne (5,26 %). Les propriĂ©tĂ©s antimicrobiennes des huiles essentielles de ces plantes ont Ă©tĂ© testĂ©es in vitro sur cinq souches bactĂ©riennes (Staphylococcus aureus, Bacillus sp.,Salmonella sp., Escherichia coli, Streptococcus sp.). Une activitĂ© inhibitrice des huiles sur les souches Ă©tudiĂ©es a Ă©tĂ© observĂ©e. Toutefois, celle dâO.basilicumsâest rĂ©vĂ©lĂ©e plus active, particuliĂšrement contre Bacillus sp., Salmonella sp., et Escherichia coli.Mots-clĂ©s: Ocimum basilicum, Hyptis suaveolens, huiles essentielles, composition chimique, propriĂ©tĂ©s antimicrobiennes. Chemical composition and antimicrobial properties of the essential oils of Ocimum basilicum andHyptis suaveolensharvested from Dakar region in SenegalEssential oils of leaves from Ocimum basilicum and Hyptis suaveolens collected in the region of Dakar in Senegal have been extracted by steam distillation and analyzed by GC and GC-MS. The oxygenated monoterpenes which estragol (38.78%), linalool (19.45%) and methyl-eugenol (9.98%) constitute the major portion of the essential oils of O. basilicum followed by bergamotene (8.48%) which is a sesquiterpene hydrocarbon. Principal compounds of H.suaveolens essential oilsare: ÎČ-caryophyllene (16.63%), sabinene (11.30%), terpinolene (8.58%), limonene (8.45%) and bergamotene (5.26%).The antimicrobial properties of essential oils of these plants were tested in vitro against five bacterial strains (Staphylococcus aureus, Bacillussp, Salmonella sp., Escherichia coli, Streptococcus sp.). The inhibitory activity of the oils on the strains studied was observed. However, the essential oil of O. basilicum was more active, especially against Bacillus sp., Salmonella sp. and Escherichia coli.Keywords: Ocimum basilicum, Hyptis suaveolens, essential oils, chemical composition, antimicrobial properties
Structural and magnetic properties of E-Fe_{1-x}Co_xSi thin films deposited via pulsed laser deposition
We report pulsed laser deposition synthesis and characterization of
polycrystalline Fe1-xCox Si thin films on Si (111). X-ray diffraction,
transmission electron, and atomic force microscopies reveal films to be dense,
very smooth, and single phase with a cubic B20 crystal structure.
Ferromagnetism with significant magnetic hysteresis is found for all films
including nominally pure FeSi films in contrast to the very weak paramagnetism
of bulk FeSi. For Fe1-xCoxSi this signifies a change from helimagnetism in
bulk, to ferromagnetism in thin films. These ferromagnetic thin films are
promising as a magnetic-silicide/silicon system for polarized current
production, manipulation, and detection.Comment: 12 pages, 4 figures accepted in the Applied Physics Letter
Structural and magnetic properties of Δ -Fe1-x Cox Si thin films deposited via pulsed laser deposition
We report pulsed laser deposition synthesis and characterization of polycrystalline Fe1-x Cox Si thin films on Si (111). X-ray diffraction, transmission electron, and atomic force microscopies reveal films to be dense, very smooth, and single phase with a cubic B20 crystal structure. Ferromagnetism with significant magnetic hysteresis is found for all films including nominally pure FeSi films in contrast to the very weak paramagnetism of bulk FeSi. For Fe1-x Cox Si this signifies a change from helimagnetism in bulk, to ferromagnetism in thin films. These ferromagnetic thin films are promising as a magnetic-silicide/silicon system for polarized current production, manipulation, and detection. © 2009 American Institute of Physics
Interleukin 7 from Maternal Milk Crosses the Intestinal Barrier and Modulates T- Cell Development in Offspring
Background
Breastfeeding protects against illnesses and death in hazardous environments, an
effect partly mediated by improved immune function. One hypothesis suggests that
factors within milk supplement the inadequate immune response of the offspring,
but this has not been able to account for a series of observations showing that
factors within maternally derived milk may supplement the development of the
immune system through a direct effect on the primary lymphoid organs. In a
previous human study we reported evidence suggesting a link between IL-7 in
breast milk and the thymic output of infants. Here we report evidence in mice of
direct action of maternally-derived IL-7 on T cell development in the offspring.
Methods and Findings
 We have used recombinant IL-7 labelled with a fluorescent dye to trace the
movement in live mice of IL-7 from the stomach across the gut and into the
lymphoid tissues. To validate the functional ability of maternally derived IL-
7 we cross fostered IL-7 knock-out mice onto normal wild type mothers. Subsets
of thymocytes and populations of peripheral T cells were significantly higher
than those found in knock-out mice receiving milk from IL-7 knock-out mothers.
Conclusions/Significance Our study provides direct evidence that interleukin 7,
a factor which is critical in the development of T lymphocytes, when maternally
derived can transfer across the intestine of the offspring, increase T cell
production in the thymus and support the survival of T cells in the peripheral
secondary lymphoid tissue
Insight from PREFACE & AWA on Tropical Atlantic Tuna ecology and effects on western African fisheries economies
International audienc
Severe pre-eclampsia: epidemiological, diagnostic, therapeutic and prognostic aspects at Hospital Principal Dakar from January 2019 to December 2020
Background: Preeclampsia, major public health problem, is one of the leading causes of maternal and infant mortality. It is increasingly frequent in our referral health centers, especially in its severe form.
Methods: Retrospective descriptive and analytical study about severe preeclampsia at the Maternity of Hospital Principal Dakar, from 01 January 2019 to 31 December 2020.
Results: Frequency of severe preeclampsia was 3.09%. Medical evacuation (70.59%) was the most frequent mode of admission. Patients were in average 29.8 years and primipare. Personal medical history was dominated by high blood pressure (16.29%). The average gestational age was 34+2 days, but pregnancy was carried to term by the majority of patients. Functional signs were dominated by headache (40.65%). Blood pressure was greater than or equal to 160/90 mmHg (90.32%). Hyperuricemia was the most frequent biological anomaly after proteinuria (45.1%). Complications were dominated by retroplacental hematoma (4.49%) and intrauterine growth retardation (IUGR) (28.48%). Calcium channel blockers (81.88%) were the main antihypertensive agents administered. Caesarean section was the most common delivery method (80.46%). The maternal prognosis was good, with no maternal deaths recorded. Perinatal mortality was 173.9%.
Conclusions: Preeclampsia remains a fearsome pregnancyâs pathology. Raising awareness of pregnant women during ANC on the risks of pre-eclampsia, retraining of health personnel, close and early monitoring of women at risk and management in a multidisciplinary setting help to improve the maternal-fetal prognosis.
Parametrizations of Inclusive Cross Sections for Pion Production in Proton-Proton Collisions
Accurate knowledge of cross sections for pion production in proton-proton
collisions finds wide application in particle physics, astrophysics, cosmic ray
physics and space radiation problems, especially in situations where an
incident proton is transported through some medium, and one requires knowledge
of the output particle spectrum given the input spectrum. In such cases
accurate parametrizations of the cross sections are desired. In this paper we
review much of the experimental data and compare to a wide variety of different
cross section parametrizations. In so doing, we provide parametrizations of
neutral and charged pion cross sections which provide a very accurate
description of the experimental data. Lorentz invariant differential cross
sections, spectral distributions and total cross section parametrizations are
presented.Comment: 32 pages with 15 figures. Published in Physical Review D62, 094030.
File includes 6 tex files. The main file is paper.tex which has include
statements refering to the rest. figures are in graphs.di
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