045). Six of 6 patients with preserved hearing had less than 35% of the tumor anterior to the longitudinal axis of the IAC compared with 13 of 20 in the serviceable hearing that was lost group (P =.036).
CONCLUSION: Our series demonstrates hearing preservation is possible for patients with large VSs and should be attempted in all patients with preoperative hearing. The quality of preoperative hearing, a cerebrospinal fluid cleft at the apex
of the IAC, and XAV-939 in vitro a smaller proportion of tumor anterior to the IAC were positively associated with hearing preservation.”
“Recent modeling studies exploring the effect of consumers’ adaptivity in diet composition on food web complexity invariably suggest that adaptivity in foraging decisions of consumers makes food webs more complex. That is, it allows for survival of a higher number of species when compared with non-adaptive food webs. Population-dynamical models in these studies share two features: parameters are selleck chemicals chosen uniformly for all species, i.e. they are species-independent, and adaptive foraging is described by the search image model. In this article, we relax both these
assumptions. Specifically, we allow parameters to vary among the species and consider the diet choice model as an alternative model of adaptive foraging. Our analysis leads to three important predictions. First, for species-independent parameter values for which the search image model demonstrates a significant effect of adaptive foraging on food web complexity, the diet choice model produces no such effect. Second, the effect of adaptive foraging through the search image model attenuates when parameter values cease to be species-independent. Finally, for the diet choice model we observe no (significant) effect of adaptive foraging on food web complexity. All these observations suggest that adaptive foraging does not always lead to more complex food webs. As a corollary, future studies of food web dynamics should pay careful attention to the choice
of type of adaptive foraging model as well as of parameter values. (C) 2010 Elsevier Ltd. All rights reserved.”
“BACKGROUND: Cerebral cavernous malformations (CCMs) can be sporadic or inherited, check details the latter characterized by multiple lesions. Novel imaging sequences have increased the sensitivity of detecting multiple CCMs.
OBJECTIVE: To compare T2-weighted gradient echo (T2*GRE) and susceptibility-weighted imaging (SWI) sequences in familial and sporadic CCM to assess their respective sensitivity.
METHODS: This prospective study included 23 consecutive cases grouped as multifocal/familial CCMs (n = 14), solitary/clustered sporadic CCMs with developmental venous anomaly (n = 8), and postirradiation CCMs (n = 1). Brain magnetic resonance imaging included T2*GRE and SWI sequences. Two radiologists independently counted the number of lesions on each sequence.