A hot spot of olive biodiversity in the Tunisian oasis of degache

Tunisia is one of the world's largest producers of olive oil, and it preserves pools of olive genetic diversity that are still unexplored. A recent prospection and collection program of the National Gene Bank of Tunisia (NGBT) focused on the vast oasis of Degache, in the south west part of Tunisia, where 47 samples were collected and genetically characterized through simple sequence repeat (SSR) markers. Identification and authentication of genotypes were obtained through comparison with reference cultivars belonging to the Olive National Collection of Tunisia (IOC) and with cultivars from Algeria, Italia, Syria and Lebanon. Degache olive genotypes showed large genetic variability, a significant diversity from the reference germplasm, and a clear differentiation from modern varieties. The population structure analysis identified four gene pools characterizing genotypes from different area of origin. Two gene pools appear to be more represented in germplasm from southern Tunisia, where environmental conditions at critical plant development phases, are harsher. This suggests that this germplasm might present traits of adaptation useful for breeding to improve resilience to abiotic stresses. Our results will support ex situ and in situ conservation activities of Tunisian olive germplasm pursued by the National Gene Bank of Tunisia

Structural Characterization of Magnetic Nano-particles Suspensions, Using Magnetic Measurements

P curves, Magnetic fluids, Ferrofluids, Nanostructural characterization, Magnetic powders, Hysteresis curve, Magnetic nanocomposite materialsThe paper describes some characteristics of the “P” curves for structural characterization of magnetic nano-particles suspensions (complex fluids, complex powders, complex composite materials, or living biological materials having magnetic properties). In the case of these materials, the magnetic properties are conferred to various carrier liquids by artificially integrating in their structure ferromagnetic particles of different sizes. The magnetic properties are usually shown by the hysteresis curve. The structure can be seen on (electronic) micrography. The P curves offer another possibility to determine the structure of the magnetic component of a complex fluid by numerical analysis of the magnetization curve experimentally obtained. The paper presents a detailed approach of the P curves and some limitations in their use

Fabrication and characterization of micro-inductors deposited on magnetic thin and thick layers

This paper presents two fabrication techniques of spiral integrated inductors based on magnetic materials. For the first one, the magnetic core is a thin film deposited by RF magnetron sputtering, for the second technique the magnetic core is a thick layer of YIG obtained by micromachining. The addition of the magnetic material is expected to improve the performances of the integrated structure with electromagnetic shield. Low and high frequency equipment are used to characterize the manufactured components. A good correlation is obtained between the results by simulation and measurements for the two manufacturing techniques. These results show that the inductance increases when the thickness of the magnetic layer increases, we can double the inductance value for a thickness sufficiently high

Esophageal and Gastric Malignancies After Bariatric Surgery: a Retrospective Global Study

Background: Bariatric surgery can influence the presentation, diagnosis, and management of gastrointestinal cancers. Esophagogastric (EG) malignancies in patients who have had a prior bariatric procedure have not been fully characterized. Objective: To characterize EG malignancies after bariatric procedures. Setting: University Hospital, United Kingdom. Methods: We performed a retrospective, multicenter observational study of patients with EG malignancies after bariatric surgery to characterize this condition. Results: This study includes 170 patients from 75 centers in 25 countries who underwent bariatric procedures between 1985 and 2020. At the time of the bariatric procedure, the mean age was 50.2 ± 10 years, and the mean weight 128.8 ± 28.9 kg. Women composed 57.3% (n = 98) of the population. Most (n = 64) patients underwent a Roux-en-Y gastric bypass (RYGB) followed by adjustable gastric band (AGB; n = 46) and sleeve gastrectomy (SG; n = 43). Time to cancer diagnosis after bariatric surgery was 9.5 ± 7.4 years, and mean weight at diagnosis was 87.4 ± 21.9 kg. The time lag was 5.9 ± 4.1 years after SG compared to 9.4 ± 7.1 years after RYGB and 10.5 ± 5.7 years after AGB. One third of patients presented with metastatic disease. The majority of tumors were adenocarcinoma (82.9%). Approximately 1 in 5 patients underwent palliative treatment from the outset. Time from diagnosis to mortality was under 1 year for most patients who died over the intervening period. Conclusion: The Oesophago-Gastric Malignancies After Obesity/Bariatric Surgery study presents the largest series to date of patients developing EG malignancies after bariatric surgery and attempts to characterize this condition.info:eu-repo/semantics/publishedVersio

Nouvelle approche pour la mesure précise de faibles tensions continues

In order to eliminate the errors which usually occur in amplifiers, the authors propose a circuit in which they are automatically compensated. A sampling technique is used, with two phases. During the first one, the error is measured and memorized and during the second, it is substracted from the result of measurement. An application using integrated circuits only is presented.En vue d'éliminer les erreurs que l'on rencontre habituellement dans les amplificateurs, les auteurs proposent un montage permettant de les compenser automatiquement. On emploie une méthode d'échantillonnage comportant deux phases : dans la première, l'erreur est mesurée et mise en mémoire ; dans la deuxième, elle est retranchée du résultat de la mesure. Une réalisation utilisant uniquement des circuits intégrés est présentée

Nouvelle approche pour la mesure précise de faibles tensions continues

En vue d'éliminer les erreurs que l'on rencontre habituellement dans les amplificateurs, les auteurs proposent un montage permettant de les compenser automatiquement. On emploie une méthode d'échantillonnage comportant deux phases : dans la première, l'erreur est mesurée et mise en mémoire ; dans la deuxième, elle est retranchée du résultat de la mesure. Une réalisation utilisant uniquement des circuits intégrés est présentée

Mesure simultanée du pouvoir thermoélectrique et de la diffusivité thermique par la méthode de l'impulsion thermique

La méthode de l'impulsion thermique, obtenue par flash optique ou par laser, pour la mesure des caractéristiques thermiques des corps (diffusivité, conductibilité, chaleur spécifique) est bien connue. Nous avons étendu la méthode à la mesure simultanée du pouvoir thermoélectrique. Connaissant l'énergie absorbée par la face antérieure de l'échantillon, l'évolution en température de la face opposée et la f.é.m. résultante obtenue entre les deux faces, on détermine le pouvoir thermoélectrique sans passer par la mesure du gradient de température à travers l'échantillon

Mesure simultanée du pouvoir thermoélectrique et de la diffusivité thermique par la méthode de l'impulsion thermique

The thermal pulse method, using an optical flash or a laser, for measuring the thermal characteristics of materials (diffusivity, conductivity, specific heat) is well known. We have extended the method to the simultaneous measurement of thermoelectric power. Knowing the energy absorbed by the front surface of the sample, the variation of the temperature of the opposite surface and the resultant emf obtained between the two faces, one determines the thermoelectric power without necessity of measurement of the temperature gradient across the sample.La méthode de l'impulsion thermique, obtenue par flash optique ou par laser, pour la mesure des caractéristiques thermiques des corps (diffusivité, conductibilité, chaleur spécifique) est bien connue. Nous avons étendu la méthode à la mesure simultanée du pouvoir thermoélectrique. Connaissant l'énergie absorbée par la face antérieure de l'échantillon, l'évolution en température de la face opposée et la f.é.m. résultante obtenue entre les deux faces, on détermine le pouvoir thermoélectrique sans passer par la mesure du gradient de température à travers l'échantillon

New technique to measure low-frequency permeability of thin magnetic films surrounded by a current sheet in a multilayer environment

International audienceA new technique of inductive measurement to determine the initial magnetic permeability μr of Yttrium Iron Garnet (YIG) thin films has been conceived and developed. The magnetic material is deposited by radio-frequency sputtering between two copper thin layers on alumina substrate. After different tests considering the geometrical, morphological and magnetic properties, we have established a protocol permitting to manufacture a prototype in an original design. The performance of the fabricated micro-inductor has been checked using the Kerr effect, X-ray diffraction and scanning electron microscopy. To obtain accurate measurement of μr, we have used a four- point probe test bench and a precision LCR meter. This technique was first validated on a larger scale by finding μr = 1 for the dielectric layers. Then, the current sheet method was validated with thick layers of commercial YIG. From several tests the magnetic permeability of YIG thin films has been evaluated as 2

Structural Characterization of Magnetic Nano-particles Suspensions, Using Magnetic Measurements

Submitted on behalf of EDA Publishing Association (http://irevues.inist.fr/handle/2042/5920)International audienceThe paper describes some characteristics of the "P" curves for structural characterization of magnetic nano-particles suspensions (complex fluids, complex powders, complex composite materials, or living biological materials having magnetic properties). In the case of these materials, the magnetic properties are conferred to various carrier liquids by artificially integrating in their structure ferromagnetic particles of different sizes. The magnetic properties are usually shown by the hysteresis curve. The structure can be seen on (electronic) micrography. The P curves offer another possibility to determine the structure of the magnetic component of a complex fluid by numerical analysis of the magnetization curve experimentally obtained. The paper presents a detailed approach of the P curves and some limitations in their use