200,776 research outputs found
Natural attenuation: implications for trace metal/metalloid nutrition
No full textAs discussed in detail in previous chapters, natural attenuation of metals by soils decreases metal bioavailability. It can therefore be highly desirable to facilitate this process in soils in which metals are present at concentrations of ecotoxicological concern. However, many metals are also essential micronutrients. In fact, micronutrient metals are probably more frequently present at low concentrations in soils than at toxic concentrations, resulting in constraints to crop growth and deficiencies for animal and human health. For example, millions of hectares of arable land are thought to be micronutrient deficient, limiting crop production (Fageria et al. 2002), with crop recovery rates for applied micronutrient fertilizers as low as 5 to 10% because of adsorption and fixation reactions in soils (Mortvedt 1994). Moreover, it has been estimated that more than 40% of the world’s population suffers from some form of micronutrient malnutrition (Welch and Graham 2002) due to insufficient micronutrient uptake by crops.Rebecca Hamon, Samuel Stacey, Enzo Lombi, and Mike McLaughli
Hamon 10x100 MΩ resistor based traceable source for calibration of picoammeters in the range 100 pA ÷ 100 nA
No full textThis paper describes a measurement method developed at National Institute of metrological Research (INRIM) to calibrate picoammeters in dc current from 100 pA to 100 nA. The current source is based on a traceable to the dc resistance national standard 10 x 100 M Omega Hamon resistor developed at INRIM and on a traceable to the dc voltage national standard high precision dc voltage calibrator. The expanded uncertainties of the method for the calibration of picoammeters span from 9.4 x 10(-4) for the gain of a picoammeter at 100 pA to 4.0 x 10(-4) for the gain at 100 nA. A detailed uncertainties budget at 10 nA level and the results of a comparison with a different technique are also reported
Rosa M. Faes, Manuel del Busto, Arquitecto, 1874-1948. Oviedo, Collegio Official de Architectos de Asturias, 1997, 287 p., nb. ill. n.et bl.
No full textHamon Françoise. Rosa M. Faes, Manuel del Busto, Arquitecto, 1874-1948. Oviedo, Collegio Official de Architectos de Asturias, 1997, 287 p., nb. ill. n.et bl.. In: Revue de l'Art, 1998, n°120. pp. 110-111
Charrier A., Jacquot M., Hamon S. et Nicolas D., 1997 L'amélioration des plantes tropicales.
No full textPéhaut Yves. Charrier A., Jacquot M., Hamon S. et Nicolas D., 1997 L'amélioration des plantes tropicales.. In: Cahiers d'outre-mer. N° 205 - 52e année, Janvier-mars 1999. pp. 106-107
Les derniers jours de M. Hamon, curé de Saint-Sulpice / par un prêtre de la communauté de Saint-Sulpice...
No full textComprend : Lettre à l'occasion de la mort de M. André Hamon,... Paris, le 17 décembre 1874Avec mode text
Bitsch, J., Barbier, Y., Gayubo, S. F., Schmidt, K. & Ohl, M. - Hyménoptères Sphecidae d'Europe occidentale. Volume 2. Paris, Fédération française des Sociétés de Sciences naturelles, 1997, Faune de France n° 82
No full textHamon Jacques. Bitsch, J., Barbier, Y., Gayubo, S. F., Schmidt, K. & Ohl, M. - Hyménoptères Sphecidae d'Europe occidentale. Volume 2. Paris, Fédération française des Sociétés de Sciences naturelles, 1997, Faune de France n° 82. In: Bulletin de la Société entomologique de France, volume 102 (4), octobre 1997. p. 390
M. de Virville (sous la direction de), D. Gluck, M. Hamon, J. Nicourt, S. Tardieu, Système descriptif des objets domestiques français, préface de J. Cuisenier
No full textLemonnier Pierre. M. de Virville (sous la direction de), D. Gluck, M. Hamon, J. Nicourt, S. Tardieu, Système descriptif des objets domestiques français, préface de J. Cuisenier. In: Études rurales, n°83, 1981. pp. 142-143
Cigarette smoke-induced emphysema and lung inflammation are attenuated by low-dose azithromycin in BALB/c mice
No full textAbstract published in TSANZ20 Posters AbstractsMacowan, M, Liu, H, Keller, M, Ween, M, Hamon, R, Tran, H, Hodge,
Calliphoridae de Haute-Volta et de Côte d'Ivoire : avec quelques notes sur ceux du Mali, du Sénégal, de la Guinée et du Dahomey (Dipt. Cyclorhapha)
No full textRickenbach André, Hamon J., Ovazza M. Calliphoridae de Haute Volta et de Côte d'Ivoire, avec quelques notes sur ceux du Mali, du Sénégal, de la Guinée et du Dahomey [Dipt. Cyclorhapha]. In: Bulletin de la Société entomologique de France, volume 67 (5-6), Mai-juin 1962. pp. 132-141
Diagnostic performance of multislice spiral computed tomography of coronary arteries as compared with conventional invasive coronary angiography: a meta-analysis.
No full textOBJECTIVES:
This study was designed to define the current role of multislice spiral computed tomography (MSCT) for the diagnosis of coronary artery disease (CAD) using a meta-analytic process.
BACKGROUND:
Multislice spiral computed tomography has recently been proposed as an alternative to conventional coronary angiography (CA) for the diagnosis of CAD.
METHODS:
Using Medline, we identified 29 studies (2,024 patients) evaluating CAD by means of both MSCT (> or =16 slices) and conventional CA before July 2006. After data extraction the analysis was performed according to a random-effects model.
RESULTS:
The per-segment analysis pooled the results from 27 studies corresponding to a cumulative number of 22,798 segments. Among unassessable segments, 4.2% were excluded from the analysis and 6.4% were classified at the discretion of the investigators, underscoring the shortcomings of MSCT. With this major limitation, the per-segment sensitivity and specificity were 81% (95% confidence interval [CI] 72% to 89%) and 93% (95% CI 90% to 97%), respectively, with positive and negative likelihood ratios of 21.5 (95% CI 13.1 to 35.5) and 0.11 (95% CI 0.06 to 0.21), respectively, and positive and negative predictive values of 67.8% (95% CI 57.6% to 78.0%) and 96.5% (95% CI 94.7% to 98.3%), respectively. As expected, the per-patient analysis has shown an increased sensitivity of 96% (95% CI 94% to 98%) but a decreased specificity of 74% (95% CI 65% to 84%).
CONCLUSIONS:
Multislice spiral computed tomography has shortcomings difficult to overcome in daily practice and, at the more clinically relevant per-patient analysis, continues to have moderate specificity in patients with high prevalence of CAD. Studies evaluating the diagnostic performance of the newest generation of MSCT, including patients with low to moderate CAD prevalence, will be critical in establishing the clinical role of this emerging technology as an alternative to CA
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