Sean O’neill

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Soil microorganisms are key drivers of terrestrial biogeochemical cycles, yet it is still unclear how variations in soil microbial community composition influence many ecosystem processes. We investigated how shifts in bacterial community composition and diversity resulting from differences in carbon (C) availability affect organic matter decomposition by(More)
The possible effects of soil microbial community structure on organic matter decomposition rates have been widely acknowledged, but are poorly understood. Understanding these relationships is complicated by the fact that microbial community structure and function are likely to both affect and be affected by organic matter quality and chemistry, thus it is(More)
Fluids research often involves developing theories about the complex relationships between multiple scalar and vector quantities. We discuss strategies for effectively visualizing co-located vector fields, enabling the key physical structures of one vector field to be clearly understood within the context of a related vector field. We describe the range of(More)
We investigated the community structure of bacteria that populate the stomach of the Brumby, a breed of feral horses from the Australian outback. Using a 16S rRNA gene clone library, we identified 155 clones that were assigned to 26 OTUs based on a 99.0 % sequence identity cutoff. Two OTUs represented 73.5 % of clones, while 18 OTUs were each assigned only(More)
BACKGROUND Patients undergoing vascular surgery procedures constitute a 'high-risk' group. Fatal and disabling perioperative complications are common. Complications arise via multiple aetiological pathways. This mechanistic redundancy limits techniques to reduce complications that target individual mechanisms, for example, anti-platelet agents. Remote(More)
In this paper we show that much can be gained when speakers of an endangered language team up with linguistic anthropologists to comment on the documentary record of an endangered language. The Cherokee speakers in this study examined published linguistic data of a relatively understudied grammatical construction, Cherokee prepronominals.2 They commented(More)
Alterations in genes that regulate brain size may contribute to both microcephaly and brain tumor formation. Here, we report that Aspm, a gene that is mutated in familial microcephaly, regulates postnatal neurogenesis in the cerebellum and supports the growth of medulloblastoma, the most common malignant pediatric brain tumor. Cerebellar granule neuron(More)
Dear Sir, The “empty delta” sign is a well-recognized indicator of superior sagittal sinus thrombosis on contrast-enhanced CT. The “pseudo delta” sign, on the other hand, refers to a falsepositive empty delta sign from normal variant structures within the sinus. Arachnoid granulations or localized fat deposits within the sinus may create hypoattenuating(More)
AIM To describe our institutional experience with conversion from intravenous (IV) fentanyl infusion directly to enteral methadone and occurrence of withdrawal in critically ill mechanically ventilated children exposed to prolonged sedation and analgesia. METHODS With Institutional Review Board approval, we retrospectively studied consecutively admitted(More)
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