Dans un contexte riche d'information, un système de recherche d'informa... more Dans un contexte riche d'information, un système de recherche d'information doit être capable de trouver les meilleurs résultats possibles dans un océan d'information. Notre étude s'intéresse aux connaissances qui peuvent être extraites du contenu textuel des documents en associant ...
ABSTRACT Geotrichum candidum has been used for the preparative reduction of β-oxoalkanoic esters ... more ABSTRACT Geotrichum candidum has been used for the preparative reduction of β-oxoalkanoic esters to the corresponding D-β-hydroxyesters. The stereospecificity for ethyl 3-oxobutanoate or 3-oxopentanoate is markedly increased by preincubation of the mycelium before addition of the substrate.
Polycystic disease is a rare disorder, which most commonly manifests in the kidney and liver. Rec... more Polycystic disease is a rare disorder, which most commonly manifests in the kidney and liver. Recently an increased risk for pancreatic malignancies in subsets of patients with polycystic disease has been reported. We report a patient with polycystic liver and kidney disease who successfully underwent a Whipple's procedure for pancreatic adenocarcinoma. Although technical difficulty may increase, pancreaticoduodenectomy can be safely performed in patients with polycystic liver disease.
SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oas... more SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oasis system of south Tunisia: Gabès (local) and 15 foreign cultivars". With the aim of chosing the best alfalfa cultivars selected abroad and evaluating their performance in Tunisia, an adaptation essay of sixteen perennial alfalfa cultivars (a local one named "Gabès" and the others were introduced
Four new triterpenoid saponins, pachystegiosides A (1), B (2), C (3), and D (4), were isolated fr... more Four new triterpenoid saponins, pachystegiosides A (1), B (2), C (3), and D (4), were isolated from the roots of Acanthophyllum pachystegium KH Their structures were elucidated by means of a combination of homo-and heteronuclear 2D-NMR techniques (COSY, TOCSY, ...
ABSTRACT This paper focuses on the mechanical behavior in quasi-static tests (compression and int... more ABSTRACT This paper focuses on the mechanical behavior in quasi-static tests (compression and inter-laminar shear) of two composite materials machined by different processes. First, the impact of the variation of average surface roughness (Ra) and the machining process is studied for both materials and for each stress. The results of compression and inter laminar shear tests show that the mechanical behavior is greatly affected by the surface roughness and the machining temperatures. Secondly the effect of machining processes is detailed. The experimental results show the major dependence of the mechanical behavior on the machining process. The results obtained on the two materials being different, this work sheds light on the influence of the composition of composite materials on the surface defects and the mechanical behavior of such materials.
The ten new acylated presenegenin ( (2β,3β,4α)-2,3,27-trihydroxyolean-12-ene-23,28-dioic acid) gl... more The ten new acylated presenegenin ( (2β,3β,4α)-2,3,27-trihydroxyolean-12-ene-23,28-dioic acid) glyco-sides 1 ± 10 have been isolated by successive MPLC from the roots of Polygala myrtifolia L. as five inseparable mixtures of the trans-and cis-4-methoxycinnamoyl ...
Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 2013
ABSTRACT This work investigated the variability in drought tolerance under arid conditions of Med... more ABSTRACT This work investigated the variability in drought tolerance under arid conditions of Mediterranean alfalfa genotypes with the overall aim to assess the main criteria that are associated with the relative tolerance and to discover the most tolerant ecotypes. For this, 16 alfalfa genotypes originating from seven countries of the Mediterranean basin were tested in an experimental station in south of Tunisia. The trial was conducted under two irrigation treatments. The first was normally irrigated by providing an amount of water corresponding to the potential evapotranspiration of the crop, and in the second with water deficit which was applied by stopping the irrigation during 8 weeks in summer. A significant decrease was observed under water deficit for biomass production, leaf stem ratio and water use efficiency. The sensitive index, in stress treatment, varies between 13.8% and 46.2% for dry yield. Results showed that some genotypes exhibited high-forage yield potential even in the presence of stress, mainly Amerist, Sardi10 and Siriver. Proline accumulation in leaves was greater in water-stressed plants, while the K+ osmo-regulatory role was not definite. High biomass production, accumulation of proline and constancy of K+ in leaves are the most important criteria for tolerant alfalfa.
Dans un contexte riche d'information, un système de recherche d'informa... more Dans un contexte riche d'information, un système de recherche d'information doit être capable de trouver les meilleurs résultats possibles dans un océan d'information. Notre étude s'intéresse aux connaissances qui peuvent être extraites du contenu textuel des documents en associant ...
ABSTRACT Geotrichum candidum has been used for the preparative reduction of β-oxoalkanoic esters ... more ABSTRACT Geotrichum candidum has been used for the preparative reduction of β-oxoalkanoic esters to the corresponding D-β-hydroxyesters. The stereospecificity for ethyl 3-oxobutanoate or 3-oxopentanoate is markedly increased by preincubation of the mycelium before addition of the substrate.
Polycystic disease is a rare disorder, which most commonly manifests in the kidney and liver. Rec... more Polycystic disease is a rare disorder, which most commonly manifests in the kidney and liver. Recently an increased risk for pancreatic malignancies in subsets of patients with polycystic disease has been reported. We report a patient with polycystic liver and kidney disease who successfully underwent a Whipple's procedure for pancreatic adenocarcinoma. Although technical difficulty may increase, pancreaticoduodenectomy can be safely performed in patients with polycystic liver disease.
SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oas... more SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oasis system of south Tunisia: Gabès (local) and 15 foreign cultivars". With the aim of chosing the best alfalfa cultivars selected abroad and evaluating their performance in Tunisia, an adaptation essay of sixteen perennial alfalfa cultivars (a local one named "Gabès" and the others were introduced
Four new triterpenoid saponins, pachystegiosides A (1), B (2), C (3), and D (4), were isolated fr... more Four new triterpenoid saponins, pachystegiosides A (1), B (2), C (3), and D (4), were isolated from the roots of Acanthophyllum pachystegium KH Their structures were elucidated by means of a combination of homo-and heteronuclear 2D-NMR techniques (COSY, TOCSY, ...
ABSTRACT This paper focuses on the mechanical behavior in quasi-static tests (compression and int... more ABSTRACT This paper focuses on the mechanical behavior in quasi-static tests (compression and inter-laminar shear) of two composite materials machined by different processes. First, the impact of the variation of average surface roughness (Ra) and the machining process is studied for both materials and for each stress. The results of compression and inter laminar shear tests show that the mechanical behavior is greatly affected by the surface roughness and the machining temperatures. Secondly the effect of machining processes is detailed. The experimental results show the major dependence of the mechanical behavior on the machining process. The results obtained on the two materials being different, this work sheds light on the influence of the composition of composite materials on the surface defects and the mechanical behavior of such materials.
The ten new acylated presenegenin ( (2β,3β,4α)-2,3,27-trihydroxyolean-12-ene-23,28-dioic acid) gl... more The ten new acylated presenegenin ( (2β,3β,4α)-2,3,27-trihydroxyolean-12-ene-23,28-dioic acid) glyco-sides 1 ± 10 have been isolated by successive MPLC from the roots of Polygala myrtifolia L. as five inseparable mixtures of the trans-and cis-4-methoxycinnamoyl ...
Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 2013
ABSTRACT This work investigated the variability in drought tolerance under arid conditions of Med... more ABSTRACT This work investigated the variability in drought tolerance under arid conditions of Mediterranean alfalfa genotypes with the overall aim to assess the main criteria that are associated with the relative tolerance and to discover the most tolerant ecotypes. For this, 16 alfalfa genotypes originating from seven countries of the Mediterranean basin were tested in an experimental station in south of Tunisia. The trial was conducted under two irrigation treatments. The first was normally irrigated by providing an amount of water corresponding to the potential evapotranspiration of the crop, and in the second with water deficit which was applied by stopping the irrigation during 8 weeks in summer. A significant decrease was observed under water deficit for biomass production, leaf stem ratio and water use efficiency. The sensitive index, in stress treatment, varies between 13.8% and 46.2% for dry yield. Results showed that some genotypes exhibited high-forage yield potential even in the presence of stress, mainly Amerist, Sardi10 and Siriver. Proline accumulation in leaves was greater in water-stressed plants, while the K+ osmo-regulatory role was not definite. High biomass production, accumulation of proline and constancy of K+ in leaves are the most important criteria for tolerant alfalfa.
Uploads