Magnetite-based magnetoreception in birds: the effect of a biasing field and a pulse on migratory behavior

To test the hypothesis that single domain magnetite is involved in magnetoreception, we treated Australian silvereyes Zosterops l. lateralis with a strong, brief pulse designed to alter the magnetization of single domain particles. This pulse was administered in the presence of a 1 mT biasing field, either parallel to the direction of the biasing field (PAR group) or antiparallel (ANTI group). In the case of magnetoreceptors based on freely moving single domain particles, the PAR treatment should have little effect, whereas the ANTI treatment should cause remagnetization of the magnetite particles involved in a receptor and could produce a maximum change in that receptor's output for some receptor configurations. Migratory orientation was used as a criterion to assess the effect on the receptor. Before treatment, both groups preferred their normal northerly migratory direction. Exposure to the biasing field alone did not affect their behavior. Treatment with the pulse in the presence of the biasing field caused both the PAR and the ANTI birds to show an axial preference for the east—west axis, with no difference between the two groups. Although these results are in accordance with magnetite-based magnetoreceptors playing a role in migratory orientation, they do not support the hypothesis that single domains in polarity-sensitive receptors are free to move through all solid angles. Possible interpretations, including other arrangements of single domains and superparamagnetic crystals, are discussed

Whole-gear efficiency of a benthic survey trawl for flatfish

Whole-gear efficiency (the proportion of fish passing between the otter doors of a bottom trawl that are subsequently captured) was estimated from data collected during experiments to measure the herding efficiency of bridles and doors, the capture efficiency of the net, and the length of the bridles sufficiently close to the seafloor to elicit a herding response. The experiments were focused on four species of flatfish: arrowtooth flounder (Atheresthes stomias), flathead sole (Hippoglossoides elassodon), rex sole (Glyptocephalus zachirus), and Dover sole (Microstomus pacificus). Whole-gear efficiency varied with fish length and reached maximum values between 40% and 50% for arrowtooth flounder, flathead sole, and rex sole. For Dover sole, however, whole-gear efficiency declined from a maximum of 33% over the length range sampled. Such efficiency estimates can be used to determine catchability, which, in turn, can be used to improve the accuracy of stock assessment models when the time series of a survey is short

Facing up to the challenge of behavioural observation in infant hearing assessment

The ability to assess detection and discrimination of speech by infants has proved elusive. Dr Iain Jackson and colleagues discuss how new technologies and fresh approaches might offer valuable insight into young infants’ behavioural responses to sound

The entanglement beam splitter: a quantum-dot spin in a double-sided optical microcavity

We propose an entanglement beam splitter (EBS) using a quantum-dot spin in a double-sided optical microcavity. In contrast to the conventional optical beam splitter, the EBS can directly split a photon-spin product state into two constituent entangled states via transmission and reflection with high fidelity and high efficiency (up to 100 percent). This device is based on giant optical circular birefringence induced by a single spin as a result of cavity quantum electrodynamics and the spin selection rule of trion transition (Pauli blocking). The EBS is robust and it is immune to the fine structure splitting in a realistic quantum dot. This quantum device can be used for deterministically creating photon-spin, photon-photon and spin-spin entanglement as well as a single-shot quantum non-demolition measurement of a single spin. Therefore, the EBS can find wide applications in quantum information science and technology.Comment: 7 pages, 5 figure

A 'special' delivery? Exploring the impact of screens, live-links and video-recorded evidence on mock juror deliberation in rape trials

This article discusses the findings of a study in which 160 volunteer members of the public observed one of four mini rape trial reconstructions and were asked to deliberate as a group towards a verdict. In a context in which research into the substantive content of the deliberations of real jurors is prohibited by the Contempt of Court Act 1981, these discussions were analysed to assess whether, and in what ways, perceptions of adult rape testimony are influenced by different modes of presentation. While lawyers and other observers have speculated about the possible undue effects of alternative trial arrangements on juror perceptions and the evaluation of evidence in rape trials, the issue has received scant empirical attention. In an effort to bridge this knowledge gap, this study investigated the influence upon mock jurors of three special measures currently made available in England and Wales to adult sexual offence complainants by the Youth Justice and Criminal Evidence Act 1999, namely (1) live-links; (2) video-recorded evidence-in-chief followed by live-link cross-examination and (3) protective screens. Following a careful and contextual exploration of the content of the mock juries’ deliberations, the researchers conclude that there was no clear or consistent impact as a result of these divergent presentation modes, suggesting that concerns over the use of special measures by adult rape complainants (at least in terms of juror influence) may be overstated

On being oneself: a comparison of Heidegger and Buber on personal identity

The question is posed, what does it mean to be oneself? It is argued that to look for an answer in the psycho-physical characteristics of the individual himself does not take account of man's restless refusal to be content with what he is. The starting point of the inquiry is that an understanding of what makes man himself must take account of the 'beyond' in terms of which he seeks to define himself. It is this preliminary assumption which explains how Heidegger and Buber come to be considered together, for both philosophers share the view that man is an ec-static being, one who 'stands out' from himself in some way. However, it is precisely when Heidegger and Buber are juxtaposed that the problem of the thesis is set, for their views seem mutually exclusive. In Heidegger's understanding a. man is only himself when he steps forth towards his own possibility of non¬ existence. In contrast for Buber it is the relation of love which enables a person to be himself. The purpose of the comparison is to attempt to face the reality of death for each person with its effect on identity, and also the reality of the love of another person freeing one to be oneself.The argument is presented that man's relation with man as Buber presents it requires a radical reconstruction of Heidegger's analysis of existence. It is suggested that through the reality of love which resists the world 'as it is', including the power of death, the boundaries of existence need to be redefined. If love is accepted as an ontological phenomenon, then its appearance does not seem to be explicable within Heidegger's ontology of Being-towards-death. It is noted, on the other hand, that if it is possible to build an alternative ontology on love, the final possibility of death cannot be sidestepped. It is here that Heidegger can be used to strengthen Buber's notion of relation, for Buber seems to ignore the finitude of man, and the threat it poses to the 'I-Thou' relation as an ontological category.In the final section of the thesis, it is argued that the phenomenon of love cannot have its roots in this dying world. It is suggested that an explanation of the reality of love and its power to create personal Being requires an eschatological perspective. Only from such a perspective, with its refusal to accept death as a condition of man being himself, can an alternative ontology to Heidegger's be found.The conclusion reached is that the concept of God is implicit in the view of selfhood developed in the thesis. In accordance with that conclusion, in the final chapter some theological implications of a relational view of the self are outlined. In particular, the question is asked whether Persons-in-Trinity can be viewed as the ultimate resource for personhood. Pinally, requirements for a Christological anthropology consistent with a relational selfhood, are considered

The Success of Gay–Straight Alliances in Waterloo Region, Ontario: A Confluence of Political and Social Factors

This article outlines how gay–straight alliances (GSAs) work to connect youth with community resources, and outlines the political and social context of GSAs in Waterloo Region, Ontario, Canada. Fifteen individuals (youth, teachers, and a lesbian, gay, bisexual, transgender, and queer [LGBTQ] youth service provider) participated in interviews about the role of GSAs in creating supportive school environments for LGBTQ youth and their allies. Analyses of the interview data found that, apart from providing direct support to LGBTQ students, GSAs in Waterloo Region decrease isolation by connecting youth with other LGBTQ community members, events, and resources. This article discusses how the confluence of government and school board policy and community agency support facilitates the implementation, maintenance, and success of GSAs

Using personality as a predictor of diet induced weight loss and weight management

<p>Abstract</p> <p>Background</p> <p>A major challenge for successful weight management is tailoring weight loss programs to individual needs. The aim of this study was to investigate whether personality traits could be used to match individuals to a compatible weight loss program that would maximize weight loss.</p> <p>Method</p> <p>Two different weight loss trials were conducted, both with a weight loss greater than 5% the measure of success. Fifty-four individuals, BMI 30-40 kg/m², either followed a slow, healthy eating weight loss diet (HEWLD) of 5000-6000 kJ/day for 12 weeks (n = 22), or a fast, very low energy diet (VLED) of 3000 kJ/day for 4 weeks (n = 32). Anthropometric measurements were recorded at baseline, at the end of the weight loss period and, for VLED, at the end of 10 weeks of weight maintenance. Personality traits were measured at baseline using the Tangney Self Control Scale plus 3 of the scales from the Five Factor Model - Neuroticism, Conscientiousness and Extraversion.</p> <p>Results</p> <p>The percentage weight loss was significantly greater in VLED (-7.38%) compared to HEWLD (-4.11%), (p < 0.001). Weight loss in HEWLD was positively correlated with Anxiety, a facet of Neuroticism. Weight loss in VLED was positively correlated with Neuroticism (r = 0.5, p < 0.01), and negatively correlated with Dutifulness and Discipline, facets of Conscientiousness, (p < 0.05 for both). No link was observed between weight loss and the personality trait, Self Control, in either HEWLD or VLED.</p> <p>Conclusion</p> <p>The personality factor, Neuroticism, was linked to successful weight loss (that is ≥ 5%) with a particular weight loss treatment, suggesting that there is a potential to use measures of personality to identify appropriate weight loss/management strategies for individuals.</p> <p>Trial registration</p> <p>Australia and New Zealand Clinical Trials Register (ANZCTR): <a href="http://www.anzctr.org.au/ACTRN12611000716965.aspx">ACTRN12611000716965</a></p