6,479 research outputs found
Everett and the Born Rule
During the last ten years or so, derivations of the Born rule based on
decision theory have been proposed and developed, and it is claimed that these
are valid in the context of the Everett interpretation. This claim is
critically assessed and it is shown that one of its key assumptions, although
natural in the context of the Copenhagen interpretation, is not consistent with
that of Everett. It is further argued that any interpretation that relates
outcome likelihood to the expansion coefficients connecting the wavefunction
with the eigenfunctions of the measurement operator must be inconsistent with
the Everett interpretation.Comment: 22 pages 1 figur
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The construction of self-dual normal polynomials over GF(2) and their applications to the Massey-Omura algorithm
Gaussian periods are used to locate a normal element of the finite field GF(2e) of odd degree e and an
algorithm is presented for the construction of self-dual normal polynomials over GF(2) for any odd degree.
This gives a new constructive proof of the existence of a self-dual basis for odd degree. The use of such
polynomials in the Massey-Omura multiplier improves the efficiency and decreases the complexity of the
multiplie
Radiosensitization of noradrenaline transporter-expressing tumour cells by proteasome inhibitors and the role of reactive oxygen species
Background
The radiopharmaceutical 131I-metaiodobenzylguanidine (131I-MIBG) is used for the targeted radiotherapy of noradrenaline transporter (NAT)-expressing neuroblastoma. Enhancement of 131I-MIBG's efficacy is achieved by combination with the topoisomerase I inhibitor topotecan - currently being evaluated clinically. Proteasome activity affords resistance of tumour cells to radiation and topoisomerase inhibitors. Therefore, the proteasome inhibitor bortezomib was evaluated with respect to its cytotoxic potency as a single agent and in combination with 131I-MIBG and topotecan. Since elevated levels of reactive oxygen species (ROS) are induced by bortezomib, the role of ROS in tumour cell kill was determined following treatment with bortezomib or the alternative proteasome inhibitor, MG132.<p></p>
Methods
Clonogenic assay and growth of tumour xenografts were used to investigate the effects of proteasome inhibitors alone or in combination with radiation treatment. Synergistic interactions in vitro were evaluated by combination index analysis. The dependency of proteasome inhibitor-induced clonogenic kill on ROS generation was assessed using antioxidants.<p></p>
Results
Bortezomib, in the dose range 1 to 30 nM, decreased clonogenic survival of both SK-N-BE(2c) and UVW/NAT cells, and this was prevented by antioxidants. It also acted as a sensitizer in vitro when administered with X-radiation, with 131I-MIBG, or with 131I-MIBG and topotecan. Moreover, bortezomib enhanced the delay of the growth of human tumour xenografts in athymic mice when administered in combination with 131I-MIBG and topotecan. MG132 and bortezomib had similar radiosensitizing potency, but only bortezomib-induced cytotoxicity was ROS-dependent.<p></p>
Conclusions
Proteasome inhibition shows promise for the treatment of neuroblastoma in combination with 131I-MIBG and topotecan. Since the cytotoxicity of MG132, unlike that of bortezomib, was not ROS-dependent, the latter proteasome inhibitor may have a favourable toxicity profile in normal tissues.<p></p>
Countering the Norm, (Re)authoring Our Lives: The Promise Counterstorytelling Holds as a Research Methodology With LGBTQ Youth and Beyond
Counterstorytelling, a methodology that is rooted in critical race theory, is undergirded by principles that are beneficial to understanding the experiences of lesbian, gay, bisexual, transgender, and queer-identified (LGBTQ) young people from an intersectional perspective. Counterstorytelling holds promise as a method that creates opportunities for individual transformation and resistance to dominant narratives among young people facing systemic oppression. This article outlines the design and implementation of a counterstorytelling study with LGBTQ youth and reflects on the value and associated challenges of counterstorytelling as a participatory research method
Organic slug control using Phasmarhabditis hermaphrodita
Phasmarhabditis hermaphrodita is a lethal slug parasitic nematode that has been formulated into an effective biological control agent called NemaslugĀ®. We investigated the possibility of using different application methods of P. hermaphrodita to reduce cost and the number of nematodes applied. We also compared P. hermaphrodita with a new slug pellet called FerramolĀ®, which is available for use on organic farms
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