The production and repair of radiation-induced DNA damage were measured by filter elution in strains of mouse lymphoma L5178Y cells differing in their sensitivity to ionizing radiation. The induction of radiation-induced damage, as measured by filter elution at pH 12.1, 9.6, and 7.2, was similar in the resistant strain LY-R and the sensitive strain LY-S. The repair of single-strand breaks and a...

White matter strips extracted from adult guinea pig spinal cords were subjected to tensile strain (stretch) injury ex vivo. Strain was carried out at three magnitudes (25, 50, and 100%) and two strain rate regimens: slow (0.006-0.008 s(-1)) and fast (355-519 s(-1)). The cord samples were monitored physiologically using a double sucrose-gap technique and anatomically using a horseradish peroxida...

Shape Memory Polymers (SMPs) are a class of polymers, which can undergo deformation in a flexible state at elevated temperatures, and when cooled below the glass transition temperature, while retaining their deformed shape, will enter and remain in a rigid state. Upon heating above the glass transition temperature, the shape memory polymer will return to its original, unaltered shape. SMPs have...

X-irradiated Escherichia coli B, a filament-forming strain, showed improved survival of X-rays after treatment with its own extract, either in liquid or on solid media. Extract-promoted recovery was not shown by a non-filamentforming strain E. coli B,-~. We failed to observe liquid holding recovery of X-irradiated bacteria in the absence of extract. Most experiments were performed in liquid med...

Multifunctional materials inspired by biological structures have attracted great interest, e.g. for wearable/ flexible "skin" and smart coatings. A current challenge in this area is to develop an artificial material which mimics biological skin by simultaneously displaying color change on damage as well as self healing of the damaged region. Here we report, for the first time, the development o...

1 ABSTRACT ____ An experimental study was undertaken to establish the viscoelastic behavior of IM7/K3B composite in compression at elevated temperature. Creep compliance, strain recovery and the effects of physical aging on the time dependent response was measured for uniaxial loading at several isothermal conditions below the glass transition temperature (T g). The IM7/K3B composite is a graph...

There has been relatively little study on time-dependent mechanical properties of nanowires, in spite of their importance for the design, fabrication and operation of nanoscale devices. Here we report a dislocation-mediated, time-dependent and fully reversible plastic behaviour in penta-twinned silver nanowires. In situ tensile experiments inside scanning and transmission electron microscopes s...

postsystolic motion or shortening predict recovery of myocardial function after primary percutanous coronary intervention?. J Am Soc Echocardiogr 2007;20: 505–11. 14. Lim P, Pasquet A, Gerber B, D’Hondt AM, Vancraeynest D, Gueret P et al. Is postsystolic shortening a marker of viability in chronic left ventricular ischemic dysfunction? Comparison with late enhancement contrast magnetic resonanc...

Citrobacter freundii strain WA1 was stressed by incubation in seawater microcosms for eleven years. After two years of starvation, no culturable strain was observed. Incubation of samples in nutrient-rich broth medium not supplemented with growth factors, however, allowed resuscitation of VBNC cells so that subsequent plating yielded observable colonies for significantly extended periods of tim...

BACKGROUND Recent studies suggest that angiogenic imbalance during pregnancy may lead to acute peripartum cardiomyopathy (PPCM). We propose that angiogenic imbalance and residual cardiac dysfunction may exist even after recovery from PPCM. METHODS AND RESULTS Twenty-nine women at least 12 months after presentation with PPCM, who exhibited recovery of left ventricular (LV) ejection fraction (≥...