Lower corneal hysteresis in glaucoma patients with acquired pit of the optic nerve (APON)

Objective: Acquired pit-like changes of the optic nerve head (APON) are characteristic of glaucomatous damage and may be a sign of a localized susceptibility of the optic nerve. Thus, it is possible that biomechanical properties of the ocular tissues may play a pressure-independent role in the pathogenesis of glaucoma. Corneal hysteresis (CH) appears to provide information of the biomechanical properties of the ocular hull tissues. The purpose of this study was to compare CH of patients with primary open angle glaucoma (POAG) with and without APON. Methods: A prospective case control study was done. POAG patients with and without APON were measured using the Ocular Response Analyzer by masked investigators. Patients in both groups were matched for sex, age, corneal thickness, and type of glaucoma according to maximal IOP (NTG or POAG). Statistical analysis was done using ANOVA. Results: Corneal hysteresis of 16 glaucomatous eyes with APON and 32 controls (glaucoma without APON) was measured. The mean (±SD) CH in the APON group was 8.89 (±1.53) and 10.2 (±1.05) in the control group. The difference is statistically significant (p = 0.005). Conclusions: Corneal hysteresis in POAG patients with APON was significantly lower than in patients that did not have such structural changes of the optic disc. These findings may reflect pressure-independent mechanisms involved in the pathogenesis of such glaucomatous optic nerve changes. © Springer-Verlag 2007.

Novel comparison of kinetic models for the adsorption-coupled reduction of Cr(VI) using untreated date pit biomaterial

Biosorption of Cr(VI) onto date pit biomass has been investigated via kinetic studies as functions of initial Cr(VI) concentration, solution temperature and date pit particle size. Kinetic experiments indicated that chromate ions accumulate onto the date pits and then reduce to less toxic Cr(III) compounds. The López-García, Escudero and Park Cr(VI) biosorption kinetic models, which take into consideration the direct reduction, the passivation process and the follow-on decrease of the active surface area of reaction, were applied to the kinetic data. The models represented the experimental data accurately at low Cr(VI) concentration (0.480 mM) and small particle size (0.11–0.22 mm) at which the Cr(VI) was completely removed from the aqueous solution and completely reduced to Cr(III) after 420 min. Date pit biomass thus offers a green chemical process for the remediation of chromium from wastewater. This investigation will help researchers employ the adsorption-coupled reduction of Cr(VI) models and simplify their application to kinetic experimental data.

新註便蒙演說日記故事Xin zhu bian meng yan shuo ri ji gu shi.Recueil d'exemples moraux pour les enfants ; autre titre : 新增註釋演說二十四孝故事Xin zeng zhu shi yan shuo er shi si xiao gu shi.Les vingt-quatre exemples de piété filiale expliqués et développés.

Comprenant les vingt-quatre traits de piété filiale avec gravures (livre 1), des exemples d'intelligence précoce (livre 2), de bonne éducation domestique (livre 3), de perfectionnement de soi-même (livre 4), de fidélité et de dévouement (livre 5).

繡像二十四孝圖Xiu xiang er shi si xiao tu.Les vingt-quatre exemples de piété filiale, illustrés.

Au début du volume, une chanson. Gravé à la salle Fu wen, à Canton.

« Lettres de M*** sur divers sujets de morale et de piété. » (1686-1719).

Contient : « LIIIe lettre, Relation de la mort de madame d'Aligre, 3 oct. 1712 »