N-Alkyl morpholines demonstrated the best inhibition profiles for this enzyme and derivatives (15a)-(15d) acted as non-competitive inhibitors with IC50 values of 55.1-88.6 mu M. Within this study, some preliminary structure-activity relationships are proposed, and it is demonstrated that N-substituted morpholines display better inhibitory profiles for the enzymes analysed than any of the N-substituted oxazepanes. (C) 2011 Elsevier SN-38 cost Ltd. All rights reserved.”
“Background: Due to low energy levels in microphotodiode-based subretinal visual prostheses, an external power supply is
mandatory. We report on the surgical feasibility and the functional outcome of the extraocular part of an approach to connect a subretinal prosthesis to an extracorporeal connector in the retro-auricular space via a trans-scleral, transchoroidal cable.\n\nMethods: Seven volunteers with retinitis pigmentosa received an active subretinal implant; Dibutyryl-cAMP energy was supplied by gold wires on a trans-sclerally, transchoroidally implanted polyimide foil leading to the lateral orbital rim where it was fixated and connected to a silicone cable. The cable was implanted subperiostally beneath the temporal muscle using a trocar to the retro-auricular space where it penetrated the skin for connection to a stimulator. To avoid subretinal movement of the implant, three tension relief
points have been introduced.\n\nResults: All implantations were performed as planned without complications, and no serious adverse events occurred in the postoperative period. Fixation of the implants was stable throughout the entire study duration of
4 weeks; permanent skin penetration see more proved to be uncomplicated. Motility was minimally restricted in downgaze and ab-/adduction. Explantation was uneventful.\n\nConclusion: The above-described procedure provides a method for stable fixation of a subretinal device with a trans-scleral, transchoroidal cable connection to an extracorporeal connector.”
“Homologous chromosomes are segregated during the first meiotic division (meiosis I). Unfortunately, human oocytes are particularly susceptible to mis-segregation errors, so generating aneuploid, often non-viable, embryos. Here we review the cell biology of meiosis I and how homolog disjunction is regulated for mammalian oocytes. We focus on the activity of the anaphase-promoting complex/cyclosome (APC/C), which is responsible for timely degradation of the cohesin component, REC8 and the cyclin B regulatory subunit of maturation-promoting factor, both essential steps for meiosis I completion. In particular, we examine the role played by the spindle assembly checkpoint in controlling the APC/C activity, and in so doing ensuring accurate disjunction of homologs.