New Blackfriars, Volume 103, Issue 1105, Page 396-407, May 2022.

Cytokinins are plant hormones which have long been associated with cell division and plastid differentiation. Recently, they have been found to play a central role also in the growth of plant tumors. Certain phytopathogenic bacteria, notably Agrobacterium tumefaciens and Pseudomonas syringae pv. savastanoi, can incite tumors on dicotyledonous plants and such tumors exhibit growth which is characteristic of the presence of excess auxin and cytokinin. Genes specifying cytokinin biosynthesis have now been isolated from both sets of bacteria. The genes encode (...) prenyl transferase responsible for cytokinin biosynthesis which, upon expression in E. coli,cause the production of the active cytokinin, zeatin. Expression of these genes in association with the plant is responsible for at least part of the tumor phenotype, although the molecular mechanisms of infection by these bacteria are apparently quite dissimilar. There is extensive homology between the cytokinin biosynthetic genes from the two sets of bacteria. (shrink)

Objectives To review the extant literature on HIV criminal laws, and to determine the impact of these laws on public health practice.Methods The available research on this topic was obtained and reviewed.Results The extant literature addressed three main topics: people's awareness of HIV criminal laws; people's perceptions of HIV criminal laws; and the potential effects of HIV criminal laws on people's sexual, HIV-status disclosure and healthcare-seeking practices. Within these categories, the literature demonstrated a high level of awareness of HIV criminal (...) laws, but a poor comprehension of these laws. For perceptions, on the whole, the quantitative research identified support for, while the qualitative literature indicated opposition to, these laws. Lastly, the behavioural effects of HIV criminal laws appear to be complex and non-linear.Conclusions A review of the extant literature from a public health perspective leads to the conclusion that HIV criminal laws undermine public health. (shrink)

Recently, focus groups and qualitative interviews with nurses who provide frontline care for persons living with HIV highlighted the contentiousness surrounding the seemingly innocuous activity of counselling clients about HIV‐status disclosure, hereafter disclosure counselling. These empirical studies highlighted that while some nurses felt they should instruct clients to disclose their HIV‐positive status if HIV transmission were possible, other nurses were equally adamant that such counselling was outside the nursing scope of practice. A review of these opposing perceptions about disclosure counselling, (...) including an examination of the empirical evidence which supports each point, revealed that the dichotomous arguments needed to be nuanced. The empirical evidence about serostatus disclosure neither supported nor refuted either of these assertions; rather, it substantiated parts of each. To create this understanding, both empirical and theoretical works are used. First, the results of empirical studies about serostatus disclosure, or lack thereof and HIV transmission is presented; as part of this, Marks and Crepaz's HIV disclosure and exposure framework is examined. Second, the work of Michel Foucault on disciplinary and pastoral power is drawn from. The outcome is a nuanced understanding about the interrelationships between disclosure counselling and nursing practice and a final interpretation about what this understanding means for public health practice. (shrink)

In this paper I present a dynamic-epistemic hybrid logic for reasoning about information and intention changes in situations of strategic interaction. I provide a complete axiomatization for this logic, and then use it to study intentions-based transformations of decision problems.

This is the introduction of the special issue,.

The lateralized ERP N2pc component has been shown to be an effective marker of attentional object selection when elicited in a visual search task, specifically reflecting the selection of a target item among distractors. Moreover, when targets are known in advance, the visual search process is guided by representations of target features held in working memory at the time of search, thus guiding attention to objects with target-matching features. Previous studies have shown that manipulating working memory availability via concurrent tasks (...) or within task manipulations influences visual search performance and the N2pc. Other studies have indicated that visual vs. spatial working memory manipulations have differential contributions to visual search. To investigate this the current study assesses participants' visual and spatial working memory ability independent of the visual search task to determine whether such individual differences in working memory affect task performance and the N2pc. Participants completed a visual search task to elicit the N2pc and separate visual working memory and spatial working memory assessments. Greater SPWM, but not VWM, ability is correlated with and predicts higher visual search accuracy and greater N2pc amplitudes. Neither VWM nor SPWM was related to N2pc latency. These results provide additional support to prior behavioral and neural visual search findings that spatial WM availability, whether as an ability of the participant's processing system or based on task demands, plays an important role in efficient visual search. (shrink)

in Sounds and Perception: New Philosophical Essays, ed. by Matthew Nudds and Casey O’Callaghan (Oxford University Press, forthcoming in 2008).

This is a reply to Casey O'Callaghan and Jonathan Westphal’s comments on Seeing Dark Things: The Philosophy of Shadows. Both attempt to soften the blow to intuition that comes from the most controversial thesis of the book: we see the backs of back-lit objects. Each characterizes the viewing of silhouettes as a kind of marginal seeing that only discloses shapes, sizes and location. In response, photographs are presented to show that silhouettes are typically three-dimensional and they often have internal structure. (...) Consider the silhouette of a bird fluttering inside a cage; we see more than the outline of the cage. Orbiting this main point are subsidiary points about the distinction between shade and shadows, the nature of occlusion, the color black, and peculiarities of absent absences. (shrink)

Nanoparticles of cobalt ferrite prepared by the co-precipitation method with crystallite size varying from 4.7 to 41 nm have been characterized by positron annihilation lifetime spectroscopy. Three lifetime components are fitted to the lifetime data. The shortest lifetime component is attributed to the delocalized positron lifetime shortened by defect trapping. The intermediate lifetime is assigned to the positron annihilation in diffuse vacancy clusters or microvoids at the grain boundaries and at the grain-boundary triple points. The longest component corresponds to the (...) pick-off annihilation of ortho-positronium formed at the larger voids. The variations in these lifetimes and their relative intensities with annealing temperature and crystallite size have been studied in detail. (shrink)

Selected articles on Marxism, nationalism, and humanism by a radical humanist leader and Communist international; includes study on his life and work.

Suave, mari magno turbantibus aequora ventise terra magnum alterius spectare laborem;non quia vexari quemquamst iucunda voluptas,sed quibus ipse malis careas quia cernere suave est.suave etiam belli certamina magna tueri 5per campos instructa tua sine parte pericli.sed nil dulcius est, bene quam munita tenereedita doctrina sapientum templa serena,despicere unde queas alios passimque videreerrare atque viam palantis quaerere vitae, 10certare ingenio, contendere nobilitate,noctes atque dies niti praestante laboread summas emergere opes rerumque potiri.o miseras hominum mentes, o pectora caeca!qualibus in tenebris vitae quantisque (...) periclis 15degitur hoc aevi quodcumquest! nonne viderenil aliud sibi naturam latrare, nisi utquicorpore seiunctus dolor absit, mensque fruaturiucundo sensu cura semota metuque?It is pleasant, when the winds stir up the waters on the great sea,to watch the great struggle of another from land;not because it is a great pleasure that anyone be troubled,but because it is pleasant to observe the troubles you yourself lack.It is also pleasant to watch the great contests of war 5spread out over the plains without taking any part in the danger.But nothing is more pleasing than to hold lofty yet calm templesthat are well defended by the teachings of wise men,from which you can look down and see others everywherego astray and wander while seeking the path of their life, 10competing in wits and contending over their nobility;throughout nights and days they strive with outstanding labourto come out at the peak of riches and have power over everything.O wretched minds of men, O blind hearts!In what shadows of life and in how many dangers 15is this bit of life, whatever it may be, being spent by you! Do you not seethat nature barks for nothing other than this – thatgrief be separated from the body and far away, and that the mind enjoypleasant feelings cut off from anxiety and fear?Epicurus' advice to his young friend Pythocles to ‘flee all education, raising up the top sail’ contains an allusion to Circe's advice to Odysseus inOdyssey12.37–58. For much of the Greek world, education was based on the Homeric epics, and thus Epicurus' statement represents a complicated position towards Homer in particular and poetry in general. Epicurean philosophy rejects poetry because it is misleading about the gods and the nature of the soul, but Epicurus and his followers, most notably Philodemus and Lucretius, engage in poetic allusion and even the composition of poetry. Much work has been done on allusions to poetry in all three writers, but I hope here to bring out a heretofore unnoticed poetic allusion at the start ofDe rerum naturaBook 2, in which Lucretius makes a programmatic statement about not only his philosophy, but also his poetry and its place in the poetic tradition. (shrink)

It is demonstrated that a non Abelian Stokes Theorem is necessary to describe the B3 field of radiation. A simple form of the theorem is build up from the fundamental definition of B3 in O(3) gauge field theory, which is a gauge field theory applied to electrodynamics with an O(3) internal gauge symmetry bases on a complex basis ((1), (2), (3)). The indices (1) and (2) are complex conjugate pairs based on circular polarization, and the index (3) is aligned with (...) the propagation axis of radiation. (shrink)

L’objectif de cet article est de laisser entrevoir pourquoi et comment il est possible de faire pivoter une approche esthétique fondée sur des idées vers une autre fondée sur des gestes. Mon point de pivotement sera ce que Kant affirme et présuppose de l’idée esthétique et du geste (dont il ne parle que brièvement et latéralement). Il ne s’agira donc pas d’exposer l’esthétique kantienne mais plutôt faire ressortir pourquoi cette dernière ne peut donner une pleine existence au geste et ce (...) qu’o... (shrink)

Using covariant derivatives and the operator definitions of quantum mechanics, gauge invariant Proca and Lehnert equations are derived and the Lorenz condition is eliminated in U(1) invariant electrodynamics. It is shown that the structure of the gauge invariant Lehnert equation is the same in an O(3) invariant theory of electrodynamics.

I argue that while there is no evidence that Roy Holland was influenced by Henri Bergson, their views of morality nevertheless reveal an interesting similarity.

The overall contention of this paper, conducted through an examination of the idea of a ‘critical direct realism’ as this was developed across the twentieth century first in the thought of Roy Wood Sellars (1880–1973) and then in a different form by his son Wilfrid Sellars (1912–1989), is that such a view, in both its conceptual and sensory representational dimensions, is plausible as a form of direct realism. However, to the extent that the mediating sensory or qualitative dimension was itself (...) conceived by both thinkers in what I characterize as strongly ‘phenomenal realist’ terms, the resulting philosophical commitments were of a kind that most current direct realists would generally not accept, even in cases where they themselves are phenomenal realists (perhaps naïve realists). The various perceiver-dependent forms of that additional, perhaps detachable commitment of most critical realists is likely responsible for the assessment of William Pepperell Montague (1873–1953) and other ‘neo-realists’ that ‘critical realism’ is not really, as advertised by Roy Wood Sellars, a version of direct realism, but ultimately a retreat to indirect realism. However, I argue that in both of its primary conceptual and sensory representational commitments, ‘critical direct realism’ remains a plausible competitor to direct acquaintance versions of direct realism. (shrink)

Despite its admirable bottom-up methodology, Roy Sorensen's Seeing Dark Things (OUP, 2008) raises difficult theoretical questions concerning the metaphysics and perception of absences. Metaphysical difficulties include how to individuate, count, locate, and classify absences, and what determines their features. Perceptual difficulties include how to distinguish experiences of absences and presences, especially when nonveridical, and what subjects contribute to perceptual experience according to Sorensen's causal theory. In addition to articulating these difficulties, this paper also presents and explores, on Sorensen's terms, an (...) alternative account of silence. (shrink)

This paper undertakes an historical re-evaluation of Louis Althusser's philosophical legacy for modern Marxism. While Althusser self-consciously sought to defend the scientific character of Marxism, many of his closest followers eventually exited the Marxian paradigm for a post-structural post-Marxism. We argue that this development was predominately rooted in a series of philosophical errors that proved fatal in a period of retreat for European socialism. There has always been, however, a second post-Althusserian legacy associated with the critical realist conception of Marxism (...) initiated by Roy Bhaskar. Bhaskar found part of his inspiration in Althusser's successful posing of the question of Marx's science and this paper sets out to excavate the proper links between Althusser and Bhaskar in order to deepen the relationship between critical realism and scientific Marxism. (shrink)

This paper undertakes an historical re-evaluation of Louis Althusser's philosophical legacy for modern Marxism. While Althusser self-consciously sought to defend the scientific character of Marxism, many of his closest followers eventually exited the Marxian paradigm for a post-structural post-Marxism. We argue that this development was predominately rooted in a series of philosophical errors that proved fatal in a period of retreat for European socialism. There has always been, however, a second post-Althusserian legacy associated with the critical realist conception of Marxism (...) initiated by Roy Bhaskar. Bhaskar found part of his inspiration in Althusser's successful posing of the question of Marx's science and this paper sets out to excavate the proper links between Althusser and Bhaskar in order to deepen the relationship between critical realism and scientific Marxism. (shrink)