Special Libraries, April 1933

Volume 24, Issue 3https://scholarworks.sjsu.edu/sla_sl_1933/1002/thumbnail.jp

Structure and bonding in WCn (n = 2–5) clusters

Stochastic explorations of the configurational spaces for WC n (n = 2–5) clusters lead to densely populated spin states at each molecularity. We found 8, 16, 42, and 68 well-defined minima for n = 2, 3, 4, 5, respectively, in spin states ranging from singlets to quintuplets. The lowest energy isomers are triplets in all cases, except for n = 2 where there is competition between a quintuplet and a triplet state for the global minimum. The transition from planar to 3D structural preferences occurs between n = 4 and n = 5. For the global minima, the structures may be considered as the result of the interaction between two fragments: a tungsten cation and a covalently bonded anionic carbon chain. We found that spin–orbit (SO) effects reduce energy differences among isomers. Likewise, SO effects diminish as a function of the carbon content in the clusters to the point that for n = 5 they become negligible

State of paradont in rats after implantological operation on the background of sugar diabetes 2 type

У крыс с экспериментальным (протаминовым) сахарным диабетом 2 типа (СД2) в десне снижается уровень лизоцима и каталазы, возрастает активность уреазы, степень дисбиоза и активность эластазы. Дентальная имплантация на фоне СД2 усугубляет патологическое состояние десны. В костной ткани пародонта крыс с СД2 наблюдается снижение активности щелочной фосфатазы (ЩФ) и увеличение активности кислой фосфатазы (КФ), что более чем в 2,5 раза снижает минерализующий индекс (ЩФ/КФ). Увеличение активности эластазы в костной ткани на 36% свидетельствует о развитии воспаления. Дентальная имплантация на фоне СД2 не улучшает состояние костной ткани пародонта.In rats with experimental (protamine) type 2 diabetes mellitus (DM2), the level of lysozyme and catalase decreases, the activity of urease, the degree of dysbiosis and the activity of elastase increase. Dental implantation on the background of CD2 aggravates the pathological condition of the gums. In the periodontal bone tissue of rats with CD2, a decrease in the activity of alkaline phosphatase (ACF) and an increase in the activity of acid phosphatase (CF), which reduces the mineralizing index (FF/CF) by more than 2.5 times. An increase in the activity of elastase in bone tissue by 36% indicates the development of inflammation. Dental implantation on the background of CD2 does not improve the condition of the periodontal bone tissue