Electronic Raman Scattering in Superconducting Cuprates

We show that the novel features observed in Raman experiments on optimally doped and underdoped Bi-2212 compounds in $B_{1g}$ geometry can be explained by a strong fermionic self-energy due to the interaction with spin fluctuations. We compute the Raman intensity $R(\omega)$ both above and below $T_c$, and show that in both cases $R(\omega)$ progressively deviates, with decreasing doping, from that in a Fermi-gas due to increasing contribution from the fermionic self-energy. We also show that the final state interaction increases with decreasing doping and gradually transforms the $2\Delta$ peak in the superconducting state into a pseudo resonance mode below $2\Delta$. We argue that these results agree well with the experimental data for Bi-2212.Comment: 6 pages, 4 eps figures. To appear in Solid State Com

Explaining Facebook Support in the 2008 Congressional Election Cycle

This study investigates what explains the level of support candidates generate on Facebook and what strategic assessments campaigns are making about this community of (potential) supporters. Based on data collected about 814 major party candidates for the U.S. House of Representatives in 2008, it appears that the Facebook community responds to the same array of factors in the larger political environment as the general public when registering its collective judgments about candidate viability through Facebook support. Results of the multiple regression analyses show that the amount of campaign contributions raised is the most important variable explaining Facebook support, especially for challengers and open seat candidates. In addition, Democrats have more supporters than Republicans, and incumbents more than challengers or candidates for open seats. A competitive race increases supporter numbers for non-incumbents. When Congressional districts have with a high percentage of college educated citizens it increases candidates’ supporters, but a high percentage of young citizens diminishes their numbers. Finally, candidates who have active Facebook pages, either because of their own updating of content or as a result of postings by current supporters, generate more new supporters as a result. Campaigns that do not engage in an activity that is relatively common and easy to do (video uploads)are penalized in Facebook supporter numbers. Degree of effort works in reverse for user generated activities: candidates who have more low effort wall posts generate more Facebook supporters; those with more high effort fan photo postings do not end up with significantly more supporters

Клинический случай Х-сцепленной адренолейкодистрофии у мальчика 9 лет

X-linked adrenoleukodystrophy belongs to peroxisomal disorders characterized by combined damage to the nervous system and adrenal glands and often leading to death. This hereditary disease results in mutations in the ABCD1 gene, leading to ineffective β-oxidation of fatty acids following a decrease in the activity of acetyl-CoA synthetase of their long chains. Accumulation of acyl-CoA derivatives of fatty acids takes place, which affect the physicochemical properties of cell membranes.We have described a clinical case of X-linked adrenoleukodystrophy in a 9-year-old boy with the primary manifestation of the disease at the age of 7 years and 10 months in form of enterovirus encephalitis.Early diagnosis, prenatal screening of adrenoleukodystrophy for performing gene-specific therapy, slowing the progression of the disease, and prolonging the life of the patient with the diagnosis of a rare hereditary disease are required.Х-сцепленная адренолейкодистрофия относится к пероксисомным болезням, характеризуется сочетанным поражением нервной системы и надпочечников, часто приводящим к летальному исходу. Это наследственное заболевание вызывает мутации гена АВСD1, определяющим неэффективность β-окисления жирных кислот, в результате снижения активности ацетил-КоА синтетазы их длинных цепей. Происходит накопление ацил-КоА-производных жирных кислот с нарушением физико-химических свойств клеточных мембран.Нами описан клинический случай Х-сцепленной адренолейкодистрофии у мальчика 9 лет с первичной манифестацией заболевания в возрасте 7 лет 10 мес по типу энтеровирусного энцефалита.Необходима ранняя диагностика, пренатальный скрининг для проведения специфической терапии, замедления прогрессирования заболевания, продления жизни больному с редким наследственным диагнозом