4,020 research outputs found
Book review: El Sistema: orchestrating Venezuela’s youth, by Geoffrey Baker
No full textBook review of: El Sistema: orchestrating Venezuela’s youth, by Geoffrey Baker.
New York, NY: Oxford University Press, 2014; ISBN: 9780199341559
($35.00)Publisher PD
Some physiological and biochemical actions of ergosterol in mammals and birds
No full textThe development of new fungal food-products which may
contain high levels of ergosterol prompted this investigation into the physiological
and biochemical effects of this compound which may become an increasingly
significant dietary constituent. The level of ergosterol in one new fungal food
product, the R.H.N. mould, was measured and found to be approximately 0.1% dry
weight. There is, however, strong evidence that the level in other moulds may
be as high as 2.5% dry weight.
Ergosterol was tested for rachitogenic properties in the
chick and it was found that it did not inhibit vitamin D under any of the
conditions studied.
The sterol was also tested for hypocholesteraemic actions in
both rats and chicks. No significant lowering of serum or liver cholesterol was
observed when ergosterol was given as a dietary supplement or by subcutaneous
injection in chicks fed normal cereal-based diets. It was also shown that ergosterol
present in great excess did not inhibit the absorption of a single oral dose of
3H-cholesterol in rats or chicks.
Evidence in the literature suggested that ergosterol spares
progesterone in the pregnant, spayed rabbit. This sparing action of ergosterol
on progesterone was demonstrated in the pregnant, spayed rat. Ergosterol was
shown not to have any obvious effects when given orally or subcutaneously at various
stages of pregnancy or in early postnatal life except to increase foetal
mortality when injected into dams in late pregnancy. Ergosterol did not have
any measurable oestrogenic activity in the rat, neither did it alter progesterone
absorption or metabolism. It did, however, possess some measurable oestrogenic
activity in the chick and it also inhibited to a slight extent the oestrogen-induced
hypertrophy of the chick oviduct. Thus ergosterol is weakly anti-oestrogenic in
the chick, note that many anti-oestrogens show some oestrogenic activity when
given in large doses.
It was also found that adrenaline increased the reproductive
performance associated with a given dose of progesterone in ovariectomised rats
but that adrenalectomy in otherwise intact animals resulted in 50% of
pregnancies not continuing in rats.
Although little evidence has been found to suggest that a
high dietary level of ergosterol will have harmful effects, it should be noted
that the rise and scope of this work was limited and much more research needs
to be done before diets containing large amounts of ergosterol are marketed for
human consumption.</p
Ab-initio investigation of the antimony-vacancy complex and related defects in germanium
No full textDissertation (MSc)--University of Pretoria, 2016.Recent advances in computational technology and algorithms have made it feasible to accurately model the electronic structures of solids by means of density functional theory. The development of hybrid functionals have improved the accuracy of band gap calculations and made it possible to make qualitative predictions regarding the charge transition energy levels of defects in semiconductors.
The Sb-V defect (also known as the E-center) in germanium is a well-known defect, which have been the subject of many experimental and some theoretical studies. It has been found to have interesting annealing properties and the aim of this study is to investigate the electronic properties of the Sb-V defect theoretically. The vacancy defect in germanium (VGe), the antimony substitutional (SbGe) defect in germanium and the defect complex (Sb-V) arising from the combination of these two defects is explored in great detail and how they interact in proximity to one another is presented here. In addition, this work can be seen as a test for the effectiveness of the technique to model defects in semiconductors correctly.
The E-center defect was investigated using the HSE06 hybrid functional as implemented in the VASP code. A positive binding energy of 1.5 eV, 1.02 eV and 0.88 eV was found for the first, second and third nearest neighbor configurations respectively, between the Sb and the vacancy was predicted. No metastability was detected and the nearest-neighbor configuration had the lowest energy for all charge states. Four transition levels in the band gap were predicted, with energy level relative to the valence band maximum, lying at 0.52 eV (-2/-1), 0.40 eV (-1/0), 0.44 eV (0/+1) and 0.02 eV (+1/+2). The two mid-gap levels (-1/0) and (0/+1) had negative-U ordering with U= -0.04 eV.
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These findings were consistent with the current experimental model of the Sb-V complex in germanium whereby no metastability has been observed experimentally. The energy level of the (-2/-1) corresponded well with the experimental DLTS level in n-type material at 0.37 eV, though the correspondence for the other levels was not as good. Experimentally, no negative-U behavior was observed, but the predicted negative-U behavior was rather small and no deliberate experiments have been performed to investigate the presence of negative-U behavior in the Sb-V complex.National Research Foundation (NRF)PhysicsMScUnrestricte
Geoffrey Robertson on the History of Human Rights
No full textQueen\u27s Counsel, broadcaster and author Geoffrey Robertson has achieved international fame by defending high-profile cases, often representing victims of alleged human rights abuses. Here, at an event organised by Amnesty Australia, he gives a short history of human rights, from the Magna Carta to the present
Utah v. Webb : Unknown
No full textMr. Geoffrey J. Butler Clerk of the Court Utah Supreme Court 322 State Capitol S a l t Lake City, UT 84114 Re: State v. Webb Case No. 2089
Nicholas Lossky, José Miguez Bonino, John S. Pobee, Tom F. Stransky, Geoffrey Wainwright, Pauline Webb (éd.), Dictionary of the Ecumenical Movement., 1991
No full textDe Halleux André. Nicholas Lossky, José Miguez Bonino, John S. Pobee, Tom F. Stransky, Geoffrey Wainwright, Pauline Webb (éd.), Dictionary of the Ecumenical Movement., 1991. In: Revue théologique de Louvain, 24ᵉ année, fasc. 1, 1993. pp. 98-100
Nicholas Lossky, José Miguez Bonino, John S. Pobee, Tom F. Stransky, Geoffrey Wainwright, Pauline Webb (éd.), Dictionary of the Ecumenical Movement., 1991
No full textDe Halleux André. Nicholas Lossky, José Miguez Bonino, John S. Pobee, Tom F. Stransky, Geoffrey Wainwright, Pauline Webb (éd.), Dictionary of the Ecumenical Movement., 1991. In: Revue théologique de Louvain, 24ᵉ année, fasc. 1, 1993. pp. 98-100
Beyond Adaptation: Understanding Distributional Changes (Dagstuhl Seminar 20372)
No full textThis report documents the program and the outcomes of Dagstuhl Seminar 20372 "Beyond Adaptation: Understanding Distributional Changes". It was centered around the aim to establish a better understanding of the causes, nature and consequences of distributional changes. Four key research questions were identified and discussed in during the seminar. These were the practical relevance of different scenarios and types of change, the modelling of change, the detection and measuring of change, and the adaptation to change.
The seminar brought together participants from several distinct communities in which parts of these questions are already studied, albeit in separate lines of research. These included data stream mining, where the focus is on concept drift detection and adaptation, transfer learning and domain adaptation in machine learning and algorithmic learning theory, change point detection in statistics, and the evolving and adaptive systems community. Therefore, this seminar contributed to stimulate research towards a thorough understanding of distributional changes
‘Like a Mason Addressing a Block’: Materiality and Design in Geoffrey Hill’s Poetry
No full textThis is the author accepted manuscript. The final version is available from Shearsman Books via the ISBN in this recordNote change of chapter title between accepted and published versionsArguing against the notion that contemporary British poetry is either insular or apolitical, this essay takes a new, interdisciplinary approach to the twenty-first century poetic redeployment of European material culture. It takes as a case study the work of the contemporary British poet, Geoffrey Hill. Hill's poetry makes strategic use of the built environment, in order to negotiate both the European cultural inheritance and to foreground its importance in the British poetic imagination. Reinvesting in built structure on the page, Hill’s inter-artistic eye keeps his audience historically and politically attuned to the uses to which stones, tablets and building blocks are used and re-used across the arts (to attract new audience gazes; to both found and bolster artistic reputations). The powerful contribution of Italian, French and German design models to social, rhetorical and moral thought in British poetry have frequently been neglected in scholarship of contemporary British poetics. This essay offers a corrective, focusing on Hill's distinctive contemporary attention to this shared design politics. Hill's work foregrounds the importance of this European influence, and works consciously to redirect the way that contemporary British audiences understand poetry's complex cultural inheritance and its legacy
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