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Alexander Strom,Kirti Kaul,Jutta Brüggemann,Iris Ziegler,Ilka Rokitta,Sonja Püttgen,Julia Szendroedi,Karsten Müssig,Michael Roden,Dan Ziegler,the GDS Group 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-
Increased oxidative stress is implicated in the pathogenesis of experimental diabetic neuropathy, but translational evidence in recent-onset diabetes is scarce. We aimed to determine whether markers of systemic oxidative stress are associated with diabetic sensorimotor polyneuropathy (DSPN) in recent-onset diabetes. In this cross-sectional study, we measured serum concentrations of extracellular superoxide dismutase (SOD3), thiobarbituric acid reactive substances (TBARS), and reduced glutathione (GSH) in 107 type 1 and 215 type 2 diabetes patients from the German Diabetes Study baseline cohort and 37 glucose-tolerant individuals (controls). DSPN was defined by electrophysiological and clinical criteria (Toronto Consensus, 2011). SOD3 and GSH concentrations were lower in individuals with type 1 and type 2 diabetes compared with concentrations in controls (Po0.0001). In contrast, the TBARS concentration was higher in participants with type 1 diabetes and type 2 diabetes compared with levels in controls (Po0.0001). In addition, the SOD3 concentration was higher in participants with type 1 diabetes compared to concentrations in those with type 2 diabetes (Po0.0001). A low SOD3 concentration was associated with DSPN in individuals with type 1 diabetes (β=− 0.306, P=0.002), type 2 diabetes (β=− 0.164, P=0.017), and in both groups combined (β=− 0.206, P=0.0003). Lower SOD3 concentrations were associated with decreased motor nerve conduction velocity (NCV) in men and, to a lesser degree, with reduced sensory NCV in women with diabetes. In conclusion, several biomarkers of oxidative stress are altered in recent-onset diabetes, with only a lower SOD3 concentration being linked to the presence of DSPN, suggesting a role for reduced extracellular antioxidative defense against superoxide in the early development of DSPN
Energy harvesting performance and flow structure of an oscillating hydrofoil with finite span
Kim, D.,Strom, B.,Mandre, S.,Breuer, K. Academic Press 2017 Journal of fluids and structures Vol.70 No.-
<P>The energy harvesting performance and resulting flow structures of a hydrofoil oscillating in pitch and heave are studied experimentally in a water flume. The shape of a hydrofoil cross-section is shown to have negligible influence on the power generation for the geometries tested. It is found that contribution to efficiency from heaving motion increases with reduced frequency at optimal pitching amplitude. However, contribution to efficiency from pitching motion decreases with reduced frequency because the development of a leading-edge vortex during the stroke is delayed at the high reduced frequency. Increasing the aspect ratio of the hydrofoil leads to a higher contribution to efficiency from heaving over the range of aspect ratios considered in this study. However, the effect of the aspect ratio on efficiency from pitching is negligible. When end plates are mounted at both ends of the hydrofoil, heaving power enhances. However, the enhancement of heaving power becomes smaller with increasing aspect ratio. Meanwhile, pitching power improves uniformly with the addition of end plates for all three aspect ratios. Our study suggests that the dependence of energy harvesting performance on aspect ratio is due to the delayed growth of the leading-edge vortex near the ends of the hydrofoil.</P>
New Ball-Milled Metal Hydride Electrode for Rechargeable Batteries
노학(Hak Noh),J . O . Strom Olsen,박충년(C . N . Park) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.1
A new type of anode materials in form of nanocrystalline composite powders has been developed that offers the potential for dramatically improved discharge capacity and initial activation rate. The composites are synthesized by ball milling of two components-a major component (basic component) having high hydrogen capacity and a minor component (surface activator) with good electrocatalytic activity. The capacity increase observed by ball milling with surface activator. The ball-milled composite materials are easier to activate than the non ball-milled basic component.
키르기스스탄 Dead Lakes 암석 애벌런치의 운동 특성과 편년
오정식 ( Jeong-sik Oh ),성영배 ( Yeong Bae Seong ),알렉산더스트롬 ( Alexander Strom ),유병용 ( Byung Yong Yu ) 한국지리학회 2018 한국지리학회지 Vol.7 No.2
Rock avalanches are one of the fastest type of landslides and because of their magnitude and energy, can cause huge damage over large areas. The purpose of this study is to demonstrate the characteristics of morphology and kinematics of Dead Lakes rock avalanche, Kyrgyzstan and to provide the timing of its occurrence constrained by cosmogenic <sup>10</sup>Be surface exposure dating. The Dead Lakes rock avalanche initiated with the collapse of the entire mountain slope up to its top, composed of bedrock, and moved for ca. 7.5 km with elevation decrease up to ~1750 m if measured from the headscarp crown to the deposit’s tip. Its source zone is up to 2.7 km by 2.5 km in plan view. The deposits thickness is about 150 m on the average and its volume is ~2.2 ㎦ over the area of 14.65 ㎢. Four different motion patterns evolved during high-energetic motion process can be revealed from the landslide-related landforms such as toreva block, debris ridges, levees, linear structures, terraces, and hummocks. The timing of occurrence of the Dead Lakes rock avalanche revealed by <sup>10</sup>Be exposure dating was 48.3±2.4 ka, which was likely to be triggered by huge earthquake.
Lee, N.S.,Kim, J.S.,Cho, W.J.,Lee, M.R.,Steiner, R.,Gompers, A.,Ling, D.,Zhang, J.,Strom, P.,Behlke, M.,Moon, S.H.,Salvaterra, P.M.,Jove, R.,Kim, K.S. Academic Press 2008 Biochemical and biophysical research communication Vol.377 No.2
Embryonic stem cells (ESCs) and embryonal carcinoma cells (ECCs) possess the remarkable property of self-renewal and differentiation potency. They are model preparations for investigating the underlying mechanisms of ''stemness''. microRNAs are recently discovered small noncoding RNAs with a broad spectrum of functions, especially in control of development. Here, we show that miR-302b indirectly regulates expression of the pluripotent stem cell marker Oct4, and it directly regulates expression of Cyclin D2 protein, a developmental regulator during gastrulation. Using loss-of function and gain-of function approaches, we demonstrate that functional miR-302b is necessary to maintain stem cell self-renewal and inhibit neuronal differentiation of human ECCs. During retinoic acid-induced neuronal differentiation, Cyclin D2 protein but not mRNA expression is strongly increased, concurrent with the down-regulation of miR-302b and Oct4. Our results suggest that miR-302b plays an important role in maintaining the pluripotency of ECCs and probably ESCs, by post-transcriptional regulation of Cyclin D2 expression.