Évolution de la teneur glucidique et protéique dans les tubercules de topinambour (Helianthus tuberosus L.)

Cette note concerne l'étude de la production de matière sèche, de glucides totaux et de protéine pendant les différents stades du développement des tubercules de topinambour. (Helianthus tuberosus L.). La matière sèche varie de 17 à 20% matière frafche, les glucides totaux de 8,85 à 14,5% matière frafche dont 75% de fructose (6,71 à 12,3% matière frafche) et les proMines de 9,20 à 12,85% du poids sec. La production moyenne de glucides totaux à l'hectare se situe en année normale à 6,5 Tlha (5,9-7,2); les tubercules perdent une fraction de leur glucides en hiver. Les sous-produits d'extraction des glucides contiennent des résidus sucrés et des acides aminés et constituent un aliment dont la valeur nutritive n'est pas négligeable en période hivernale.Carbohydrates and proteins evolution in the Jerusalem artichoke (HelianthUil tubero.UII L.) tubersThis note concerns a study of production of dry matter, total carbohydrate and protein at aIl stages of development of the tubers of the Jerusalem Artichoke (Helianthus tuberosus L.). Dry matter ranges from 17 to 20% fresh matter, overall carbohydrates from 8,85 to 14,5% fresh matter, of wich 75% is fructose (6,71 à 12,3% matière frafche) and protein from 9,20 to 12,85% dry matter. The average overall carbohydrate production per hectare amounts to 6,5 Tlha (5,9-7,2) in a normal year; the tubers lose a fraction oftheir carbohydrates in winter. The byproduct from extraction of carbohydrates contain residual carbohydrates and amino-acids and orovide a food of significant nutrition al value for the win ter season

Application of calcifying bacteria for remediation of stones and cultural heritages

Since ages, architects and artists worldwide have focused on usage of durable stones as marble and limestone for construction of beautiful and magnificent historic monuments as European Cathedrals, Roman, and Greek temples, Taj Mahal etc. But survival of these irreplaceable cultural and historical assets is in question these days due to their degradation and deterioration caused by number of biotic and abiotic factors. These causative agents have affected not only the esthetic appearance of these structures, but also lead to deterioration of their strength and durability. The present review emphasizes about different causative agents leading to deterioration and application of microbially induced calcium carbonate precipitation as a novel and potential technology for dealing with these problems. The study also sheds light on benefits of microbial carbonate binders over the traditional agents and future directions

Evolution hivernale des glucides (inuline et polyfructosanes) dans les tubercules de Topinambour (Helianthus tuberosus L.) et la racine de Chicoree (Cichorium intybus L.)

INIST T 73694 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc

Fine structure of the (A0 X) complex in InP

We present stress-dependent photoluminescence measurements on exciton bound to neutral acceptor in InP. We analyse the experimental results in two theoretical schemes : the j-j coupling scheme and the crystal field scheme. We find that the triplet structure of the (A0 X) complex results from hole-hole coupling in the cubic crystal field. We show that the three bound-exciton states correspond to Γ8, Γ7,8, Γ 6 in order of increasing energies, the electron-hole exchange energy being found to be vanishingly small

Fine structure of the (A0 X) complex in InP

We present stress-dependent photoluminescence measurements on exciton bound to neutral acceptor in InP. We analyse the experimental results in two theoretical schemes : the j-j coupling scheme and the crystal field scheme. We find that the triplet structure of the (A0 X) complex results from hole-hole coupling in the cubic crystal field. We show that the three bound-exciton states correspond to Γ8, Γ7,8, Γ 6 in order of increasing energies, the electron-hole exchange energy being found to be vanishingly small.Nous présentons des mesures de photoluminescence sous contrainte uniaxiale associées à l'exciton lié à un accepteur neutre dans InP. Les résultats sont analysés suivant deux schémas théoriques : le schéma de couplage j-j et le schéma du champ cristallin. Nous montrons que la structure fine du complexe (A0 X) résulte du couplage des deux trous dans le champ cristallin cubique. Les trois états qui en résultent sont respectivement Γ 8, Γ7,8, Γ6 dans l'ordre des énergies croissantes, l'énergie d'échange électron-trou étant négligeable