Exact asymptotic form of the exchange interactions between shallow centers in doped semiconductors

The method developed in [L. P. Gor'kov and L. P. Pitaevskii, Sov. Phys. Dokl. 8, 788 (1964); C. Herring and M. Flicker, Phys. Rev. 134, A362 (1964)] to calculate the asymptotic form of exchange interactions between hydrogen atoms in the ground state is extended to excited states. The approach is then applied to shallow centers in semiconductors. The problem of the asymptotic dependence of the exchange interactions in semiconductors is complicated by the multiple degeneracy of the ground state of an impurity (donor or acceptor) center in valley or band indices, crystalline anisotropy and strong spin-orbital interactions, especially for acceptor centers in III-V and II-VI groups semiconductors. Properties of two coupled centers in the dilute limit can be accessed experimentally, and the knowledge of the exact asymptotic expressions, in addition to being of fundamental interest, must be very helpful for numerical calculations and for interpolation of exchange forces in the case of intermediate concentrations. Our main conclusion concerns the sign of the magnetic interaction -- the ground state of a pair is always non-magnetic. Behavior of the exchange interactions in applied magnetic fields is also discussed

THE NUTRITIONAL PROPHYLAXIS OF ANEMIA AND HYPOVITAMINOSIS IN CHILDREN WITH ALLERGIC DISEASES

In the article the results of the usage of high-vitamin rosehip syrup with the aim of food enrichment  in children with allergic diseases, at the stage of sanatorium-and-spa treatment are presented. Good tolerance of this product is registered as well as the increase of haemoglobin concentration, serum iron rate, the sauration rate of transferrin with iron and the improvement  in supply with vitamin C in children who took syrup, as compared with control group. These findings allow to recommend high-vitamin rosehip syrup  as a strengthening supplement in the treatment of children who suffered from allergic diseases, as well as for the profilaxis of anemia and hypovitaminosis in this category of patients. Key words: children, anemia, nutritional profilaxis, allergic diseases

ДИЕТОЛОГИЧЕСКАЯ ПРОФИЛАКТИКА АНЕМИИ И ГИПОВИТАМИНОЗА У ДЕТЕЙ С АЛЛЕРГИЧЕСКИМИ ЗАБОЛЕВАНИЯМИ

In the article the results of the usage of high-vitamin rosehip syrup with the aim of food enrichment  in children with allergic diseases, at the stage of sanatorium-and-spa treatment are presented. Good tolerance of this product is registered as well as the increase of haemoglobin concentration, serum iron rate, the sauration rate of transferrin with iron and the improvement  in supply with vitamin C in children who took syrup, as compared with control group. These findings allow to recommend high-vitamin rosehip syrup  as a strengthening supplement in the treatment of children who suffered from allergic diseases, as well as for the profilaxis of anemia and hypovitaminosis in this category of patients. Key words: children, anemia, nutritional profilaxis, allergic diseases.В статье представлены результаты изучения эффективности применения витаминизированного сиропа шиповника с целью обогащения рациона детей с аллергическими заболеваниями, находящихся на этапе санаторно-курортного лечения. Отмечена хорошая переносимость данного продукта, а также повышение концентрации гемоглобина, сывороточного железа, степени насыщения трансферрина железом и улучшение обеспеченности витамином С у детей, получавших сироп, по сравнению с детьми группы сравнения. Полученные результаты позволяют рекомендовать витаминизированный сироп шиповника как вспомогательное общеукрепляющее средство в терапии детей, страдающих аллергическими заболеваниями, а также для профилактики анемии и гиповитаминоза у данной категории больных. Ключевые слова: дети, анемия, диетологическая профилактика, аллергические болезни.(Педиатрическая фармакология. – 2006; 3(3): 62-64