Use Of The BigSol Time Of Flight Spectrometer In The Study Of Superheavy Element Production

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/98691/1/APC000594.pd

ФОРМИРОВАНИЕ ПАРАЗИТОФАУНЫ ОВЕЦ В УСЛОВИЯХ СОДЕРЖАНИЯ НА ОГРАНИЧЕННЫХ ПАСТБИЩНЫХ ТЕРРИТОРИЯХ ПРЕДГОРНОЙ ЗОНЫ АРМЕНИИ

21 parasite species have been found in structure of variety of parasite species from hybrid sheep (mouflon × domestic sheep hybrids) contained within limited grazing territories of foothill zones of Armenia. These included 9 species of nematodes, 4 of cestodes, 3 of trematodes, 3 of ixodid ticks and larvae of nasopharyngeal gadfly Oestrus ovis and sheep ked Melophagus ovinus. An analysis of paths of circulation of larvae of some biohelminthes, particularly Dicrocoelidae and Protostrongylidae, realized through invertebrate intermediate hosts (land snails) have shown that mean infection of the latter varied from 2,5 to 8,0 %.У гибридных с муфлоном овец, содержащихся в условиях ограниченных пастбищных территорий предгорной зоны Армении, выявлен 21 вид паразитов, из которых большая часть гельминты (16 видов). Нематоды представлены 9 видами, цестоды – 4 и трематоды – 3 видами. Установлено паразитирование также 3 видов иксодовых клещей и 2 видов насекомых. Исследования путей циркуляции личиночных стадий дикроцелий и протостронгилид, осуществляемых при участии беспозвоночных животных, в частности, наземных моллюсков показали их естественную зараженность от 2,5 до 8,0%

РЕКОМЕНДАЦИИ ПО БОРЬБЕ С ПРОТОСТРОНГИЛИДОЗАМИ ОВЕЦ И КОЗ В УСЛОВИЯХ АРМЕНИИ

Protostrongyloses are widely-spread in small cattle all over the world and may cause a significant economic damage manifested in decrease in livestock productivity as well as death of animals.Based on our studies, the infestation of sheep and goats with protostrongylides was detected in all landscape zones of the republic of Armenia and in animals of all ages. As a rule, the protostrongylide invasion rate of goats is higher than of sheep.  Within the republic, the average invasion extensity in goats of different age groups ranges between 20,4 and 44,1%, and in sheep – between  16,5 and 37,0%.In some stationary invasion foci, more than a half of livestock suffers through protostrongyloses. The highest protostrongylide invasion was found in animals older than 3 years of age, and the lowest – in animals of the first year of life, it means that the invasion increases with the age.The invasion of animals in mountains is higher in comparison with animals from plain areas. The peak of invasion falls on autumn and winter seasons.Taking into account a high level of protostrongylide invasion in small cattle in the republic of Armenia, and the unavailability of guidelines on this infectious disease, we have developed (based on the long term investigation of more than 3000 head of animals) methodical recommendations for the struggle against protostrongyloses.The implementation of these measurements proved their high efficacy and contributed to the significant reduction in morbidity of small cattle due to protostrongyloses.Протостронгилидозы широко распространены среди мелкого рогатого скота во всем мире и являются причиной существенного экономического ущерба, складываемого как от значительного уменьшения продуктивности животных, так и от их гибели.Согласно нашим исследованиям, зараженность овец и коз протостронгилидами установлена во всех природно-ландшафтных поясах республики и у животных всех возрастов. Как правило, зараженность коз протостронгилидами большая, чем у овец. В среднем по республике, экстенсивность инвазированности коз различных возрастных групп колеблется в пределах 20,4-44,1%, а овец от 16,5 до 37,0%. В некоторых стационарных очагах этих инвазий более половины поголовья животных переболевает протостронгилидозами. Наибольшая зараженность протостронгилидами установлена у животных старше трехлетнего возраста, а наименьшая у животных текущего   года рождения, т.е. с возрастом животных инвазированность повышается. Зараженность животных горных поясов, по сравнению с животными низменных поясов, более высокая. Пик зараженности животных приходится на осенне-зимний период.Учитывая высокую инвазированность мелкого рогатого скота в Республике Армения протостронгилидами и отсутствие нормативных рекомендаций против вызываемых ими заболеваний, нами на основании многолетних исследований, проведенных на более чем 3 тыс. голов животных, было разработано методическое наставление по борьбе с протостронгилидозами. Испытания этих мероприятий свидетельствовали о высокой их эффективности и способствовали значительному сокращению заболеваемости мелкого рогатого скота протостронгилидозами

Search for Heavy and Superheavy systems in 197Au + 232Th Collisions near the Coulomb Barrier

The reaction 197Au + 232Th at 7.5 AMeV was studied using the BigSol spectrometer at Texas A&M. Theoretical calculations suggest that this reaction could be used as an alternative method to produce heavy and superheavy elements. During the short interaction time, heavy systems of interacting nucleons are formed and, due to the strong energy dissipation, a large number nucleons can be transferred. The larger the lifetime of the decaying giant system, the larger the possible number of transferred nucleons. Moreover shell effects may help in the formation of heavy nuclei in the region of the island of stability. Reaction products emitted in an angular range from 6 to 16 degrees were collected at the entrance of the BigSol spectrometer and detected at the focal plane using a segmented ionization chamber. Four position sensitive PPAC detectors placed along the ion's flight path were used to track the product trajectories and measure the times of flight. The experimental results are presented and compared with theoretical calculations performed with the Constraint Molecular Dynamics code

Composition of parasite fauna of sheep contained within limited territories in the foothill zones of Armenia

21 parasite species have been found in structure of variety of parasite species from hybrid sheep (mouflon × domestic sheep hybrids) contained within limited grazing territories of foothill zones of Armenia. These included 9 species of nematodes, 4 of cestodes, 3 of trematodes, 3 of ixodid ticks and larvae of nasopharyngeal gadfly Oestrus ovis and sheep ked Melophagus ovinus. An analysis of paths of circulation of larvae of some biohelminthes, particularly Dicrocoelidae and Protostrongylidae, realized through invertebrate intermediate hosts (land snails) have shown that mean infection of the latter varied from 2,5 to 8,0 %

RECOMMENDATIONS FOR THE STRUGGLE AGAINST PROTOSTRONGYLOSES IN SHEEP AND GOATS IN ARMENIA

Protostrongyloses are widely-spread in small cattle all over the world and may cause a significant economic damage manifested in decrease in livestock productivity as well as death of animals.Based on our studies, the infestation of sheep and goats with protostrongylides was detected in all landscape zones of the republic of Armenia and in animals of all ages. As a rule, the protostrongylide invasion rate of goats is higher than of sheep.  Within the republic, the average invasion extensity in goats of different age groups ranges between 20,4 and 44,1%, and in sheep – between  16,5 and 37,0%.In some stationary invasion foci, more than a half of livestock suffers through protostrongyloses. The highest protostrongylide invasion was found in animals older than 3 years of age, and the lowest – in animals of the first year of life, it means that the invasion increases with the age.The invasion of animals in mountains is higher in comparison with animals from plain areas. The peak of invasion falls on autumn and winter seasons.Taking into account a high level of protostrongylide invasion in small cattle in the republic of Armenia, and the unavailability of guidelines on this infectious disease, we have developed (based on the long term investigation of more than 3000 head of animals) methodical recommendations for the struggle against protostrongyloses.The implementation of these measurements proved their high efficacy and contributed to the significant reduction in morbidity of small cattle due to protostrongyloses