For Twaron fibers, higher finish content only has a slight influence on the fibers durability at pH 11 and pH 9, by limiting abrasion and bulk degradation. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: 888-898, 2010″
“PURPOSE:

To determine the ability of the limulus amoebocyte lysate (LAL) assay and the in vitro pyrogen test (IPT) to detect pyrogens adsorbed to intraocular lenses (IOLs).

SETTING: Berlin Eye Research Institute, Berlin, Germany.

METHODS: Fifteen of each of the following IOLs were used: MicroSil MS 612 ASP, AcrySof SA60AT, Superflex, Sensar, XACT, and LS-106 IOL-s. The challenge organism suspensions were 10(3) CFU/mL and 10(4) CFU/mL Escherichia coli, 10(3) CFU/mL and 10(4) CFU/mL Pseudomonasputida, and 10(5) CFU/ mL and 10(6) CFU/mL Staphylococcus epidermidis. Two IOLs of each model were incubated Selleck SYN-117 at room temperature ATM/ATR phosphorylation for at least 2 days in 0.6 mL of 1 of the suspensions. They were then gamma sterilized. The extract of 1 IOL was tested with the LAL assay; the other IOL was tested with the IPT.

RESULTS: The LAL was negative for all incubated IOLs. The IPT was positive for all IOLs incubated in E coli and P putida suspensions, with the MicroSil MS 612 ASP, AcrySof SA60AT, XACT, and LS-106 IOLs showing a severe reaction. The Superflex

and Sensar IOLs had a slight to moderate response for lower bacterial concentrations and a moderate to severe response for higher concentrations. For S epidermidis, all IOLs showed a slight IPT response except XACT IOLs, which showed a nonpyrogenic response.

CONCLUSIONS:

Results indicate that the LAL test may fail to detect pyrogens adsorbed to Vadimezan IOLs and the IPT reliably detects pyrogens with a dose-dependent response. This has relevance in the investigation of toxic anterior segment syndrome outbreaks.”
“The present article proposes a dynamical model to obtain ferroelectric hysteresis dynamics based on fractional derivatives. The consideration of a fractional derivative term widely increases the frequency bandwidth of the accuracy of the traditional hysteresis models. As a consequence, the model is suited for successfully taking into account the well-known scaling relations of the ferroelectric hysteresis area, < A >, versus the frequency, f, and field amplitude, E(0). Under low frequency excitation, simulation tests provided good results regarding the comparison of the fractional model, experimental results and the well-known nonentire power law < A >infinity f(1/3)E(0)(2/3) (where < A > represents the hysteresis loop area). These results were followed by comparing the hysteresis area obtained from the fractional model with that from the well known scaling relations as f ->infinity, and the results were proposed as validation of the high frequency behavior.