ВЛИЯНИЕ АНТАГОНИСТИЧЕСКИХ БАКТЕРИЙ SERRATIA PLYMUTHICA И BACILLUS SUBTILIS НА РАЗВИТИЕ РИЗОКТОНИОЗА НА РАСТЕНИЯХ САЛАТА

High efficiency of mixture of two bacterial strains Serratia plymuthica and Bacillus  subtilis was shown against development of Rhizoctonia solani on plants of salad variety Leny  (Nunhems). Survival, biomass of plants, and number  of affected plants and leaves were analyzed in the experiment. Efficiency of application of a preparation of mixture bacterial strains was comparable with the chemical preparation Monceren L recommended for suppression of this disease caused Rhizoctonia solani. Цель исследования - анализ фунгицидного действия комплекса бактерий Serratia plymuthica и Bacillus subtilis по отношению к паразитическому грибу Rhizoctonia  solani на растениях салата. Материалы и методы.  Опыт  проводили в пластиковых кюветах с грунтом на растениях салата. В каждой кювете выращивали по 12 растений салата.  Растения салата в первом кювете служили  контролем и не были заражены. Во втором контрольном кювете были растения салата, инокулированные R. solani.Третий кювет обработали смесью Serratia plymuthica и Bacillus subtilis (400 мл/м2), четвертый -    химическим стандартом Монсерен (2 л/ м2). После инокуляции кюветы выдерживали в течение 72 ч  в климатической камере при 18 ºС. Спустя 14 и 31 cen по 6 растений салата срезали на уровне почвы и взвешивали. Регистрировали массу растений,  число  живых растений, число пораженных растений, число пораженных листьев салата. Результаты и обсуждение. При обработке листьев салата смесью S. plymuthica и B. subtilis и монсереном получен статистически значимый фунгицидный эффект. Эффективность препарата на основе комплекса двух бактерий аналогична эффективности химического препарата монсерен. Биомасса растений в контроле без патогена на 40 % была выше, чем в контроле, инокулированным R.  solani. Протективный эффект смеси  S.  plymuthica  и  B.  subtilis  был сравним с вариантом, обработанным монсереном.

Bound Magnetic Polaron Interactions in Insulating Doped Diluted Magnetic Semiconductors

The magnetic behavior of insulating doped diluted magnetic semiconductors (DMS) is characterized by the interaction of large collective spins known as bound magnetic polarons. Experimental measurements of the susceptibility of these materials have suggested that the polaron-polaron interaction is ferromagnetic, in contrast to the antiferromagnetic carrier-carrier interactions that are characteristic of nonmagnetic semiconductors. To explain this behavior, a model has been developed in which polarons interact via both the standard direct carrier-carrier exchange interaction (due to virtual carrier hopping) and an indirect carrier-ion-carrier exchange interaction (due to the interactions of polarons with magnetic ions in an interstitial region). Using a variational procedure, the optimal values of the model parameters were determined as a function of temperature. At temperatures of interest, the parameters describing polaron-polaron interactions were found to be nearly temperature-independent. For reasonable values of these constant parameters, we find that indirect ferromagnetic interactions can dominate the direct antiferromagnetic interactions and cause the polarons to align. This result supports the experimental evidence for ferromagnetism in insulating doped DMS.Comment: 11 pages, 7 figure

THE INFLUENCE OF ANTAGONISTIC BACTERIA SERRATIA PLYMUTHICA AND BACILLUS SUBTILIS ON AFFECTION OF SALAD PLANTS BY RHIZOCTONIA SOLANI

High efficiency of mixture of two bacterial strains Serratia plymuthica and Bacillus  subtilis was shown against development of Rhizoctonia solani on plants of salad variety Leny  (Nunhems). Survival, biomass of plants, and number  of affected plants and leaves were analyzed in the experiment. Efficiency of application of a preparation of mixture bacterial strains was comparable with the chemical preparation Monceren L recommended for suppression of this disease caused Rhizoctonia solani

Magnetic anisotropy of epitaxial Co 2

Films of Co2Fe-Ge Heusler alloy with variable Ge concentration deposited on monocrystalline MgO (100) substrates by magnetron co-sputtering are investigated using microstructural, morphological, magnetometric, and magnetic resonance methods. The films were found to grow epitaxially, with island-like or continuous-layer morphology depending the Ge-content. The ferromagnetic resonance data versus out-of-plane and in-plane angle indicate the presence of easy plane and 4-fold in-plane anisotropy. The magnetometry data indicate additional weak 2-fold in-plane anisotropy and pronounced at low fields rotatable anisotropy. The observed magnetic anisotropy properties discussed in correlation with the microstructure and morphology of the films