MS

thesisThe blood pressures of fifty hospitalized school age children were measured at interval to determine if the variables age, weight, sex, and the passage of time between readings have a significant effect on the systolic and diastolic blood pressures and the pulse pressure. The variables age, weight, and quadratic change over time were found to be significant factors, while six, sex by time, and linear change over time were not. The results show that diastolic values remain at relatively constant level during the ages five to eleven years. Children's blood pressure values seem to be subject to diurnal fluctuations that should be considered when establishing limits of normalcy or when interpreting clinical values

Attending responding becoming : a living-learning inquiry in a naturally inclusional playspace

Traditional scientific paradigms emphasise writing in the third person, effectively marginalising the subjective perspective of the researcher. Many systems thinking, cybernetics and complexity approaches are better in this regard, as they involve systemic interventions where the relationships between the researcher and other participants really matter. Writing in the first person therefore becomes acceptable.In this Thesis (and a partner document coupled with it), I have explored how to reincorporate subjective empiricism into my systemic intervention practice. This has brought forth many unanticipated contributions. These take the form of new frameworks, concepts and approaches for systems and complexity practice, emerging from my engagements with myself and others, as well as from reflections upon those engagements.However, the content of my reflections and ‘becomings’ are not all that represent my doctoral contribution; there is also the form of my representation(s), as well as the emergent nature of the process through which they have come to be. I have drawn from Gregory Bateson’s use of metalogues: where the nature of a conversation mirrors its content – e.g. getting into a muddle whilst talking about muddles! Intuitively, I grasped the importance of metalogue in what I was attempting, and found myself coining the term metalogic coherence. Without fully appreciating what this might mean in practice, I groped my way into undertaking and documenting my research in ways that I believed would be metalogically coherent with the complexity-attuned principles to which I was committing. In sum, and key to appreciating what unfolds in the narrative, is recognising this Thesis and its partner document as metalogically coherent artefacts of naturally inclusional, complexity-attuned, evolutionary research.To fully acknowledge the different ways of knowing that have flowed into my inquiry, I have written in multiple voices (called statewaves, for reasons to be explained in the thesis). I found myself shifting from one voice to another as I explored and expressed different dimensions of what I was experiencing and discovering.In addition, I have made liberal use of hyperlinks, so both documents are far from linear. They are more akin to a mycorrhizal network, interlinking flows of ideas and sensemaking, all of which can be accessed and experienced differently, depending on each reader’s engagement with and through it.The thesis and its partner document are part of a composite submission that contains both poetry and artwork (visual depictions and animations of the ideas). These elements, along with the more conventional academic text, are augmented by penetrating reflections on my personal motivations, guided by a narrator signposting the streams as they flow into and between each other. All of my being has been implicated and impacted by this endeavour. When insights and new ‘becomings’ emerged flowfully during my practice, my joy was reflected in my narrative; as indeed were my pain, doubts and reinterpretations associated with ideas that were difficult to birth. I present all this in my submission, without retrospective sanitisation or simplification. In so doing, I am keeping faith with the principle that I remain at the heart of my research, and cannot be extracted from it without doing violence to the metalogical coherence that gives it meaning

Interaction-induced impeding of decoherence and anomalous diffusion

We study how the interplay of dissipation and interactions affects the dynamics of a bosonic many-body quantum system. In the presence of both dissipation and strongly repulsive interactions, observables such as the coherence and the compressibility display three dynamical regimes: an initial exponential variation followed by a power-law regime and finally a slow exponential convergence to their asymptotic values corresponding to the infinite temperature state. These very long-time scales arise as dissipation forces the population of states disfavored by interactions. The long-time, strong coupling dynamics are understood by performing a mapping onto a classical diffusion process displaying non-Brownian behavior. While both dissipation and strong interactions tend to suppress coherence when acting separately, we find that strong interaction impedes the decoherence process generated by the dissipation.Comment: 5 pages, 3 figure

An interferometric study of the Fomalhaut inner debris disk. I. Near-infrared detection of hot dust with VLTI/VINCI

The innermost parts of dusty debris disks around main sequence stars are currently poorly known due to the high contrast and small angular separation with their parent stars. Using near-infrared interferometry, we aim to detect the signature of hot dust around the nearby A4 V star Fomalhaut, which has already been suggested to harbor a warm dust population in addition to a cold dust ring located at about 140 AU. Archival data obtained with the VINCI instrument at the VLTI are used to study the fringe visibility of the Fomalhaut system at projected baseline lengths ranging from 4 m to 140 m in the K band. A significant visibility deficit is observed at short baselines with respect to the expected visibility of the sole stellar photosphere. This is interpreted as the signature of resolved circumstellar emission, producing a relative flux of 0.88% +/- 0.12% with respect to the stellar photosphere. While our interferometric data cannot directly constrain the morphology of the excess emission source, complementary data from the literature allow us to discard an off-axis point-like object as the source of circumstellar emission. We argue that the thermal emission from hot dusty grains located within 6 AU from Fomalhaut is the most plausible explanation for the detected excess. Our study also provides a revised limb-darkened diameter for Fomalhaut (2.223 +/- 0.022 mas), taking into account the effect of the resolved circumstellar emission.Comment: 13 pages, accepted for publication in Ap

Genetic control of biennial bearing in apple

Although flowering in mature fruit trees is recurrent, floral induction can be strongly inhibited by concurrent fruiting, leading to a pattern of irregular fruiting across consecutive years referred to as biennial bearing. The genetic determinants of biennial bearing in apple were investigated using the 114 flowering individuals from an F1 population of 122 genotypes, from a ‘Starkrimson’ (strong biennial bearer)בGranny Smith’ (regular bearer) cross. The number of inflorescences, and the number and the mass of harvested fruit were recorded over 6 years and used to calculate 26 variables and indices quantifying yield, precocity of production, and biennial bearing. Inflorescence traits exhibited the highest genotypic effect, and three quantitative trait loci (QTLs) on linkage group (LG) 4, LG8, and LG10 explained 50% of the phenotypic variability for biennial bearing. Apple orthologues of flowering and hormone-related genes were retrieved from the whole-genome assembly of ‘Golden Delicious’ and their position was compared with QTLs. Four main genomic regions that contain floral integrator genes, meristem identity genes, and gibberellin oxidase genes co-located with QTLs. The results indicated that flowering genes are less likely to be responsible for biennial bearing than hormone-related genes. New hypotheses for the control of biennial bearing emerged from QTL and candidate gene co-locations and suggest the involvement of different physiological processes such as the regulation of flowering genes by hormones. The correlation between tree architecture and biennial bearing is also discussed

Acquisition of object-robbing and object/food-bartering behaviours: a culturally maintained token economy in free-ranging long-tailed macaques

Open access article. Creative Commons Attribution 4.0 International License (CC BY 4.0) appliesThe token exchange paradigm shows that monkeys and great apes are able to use objects as symbolic tools to request specific food rewards. Such studies provide insights into the cognitive underpinnings of economic behaviour in non-human primates. However, the ecological validity of these laboratory-based experimental situations tends to be limited. Our field research aims to address the need for a more ecologically valid primate model of trading systems in humans. Around the Uluwatu Temple in Bali, Indonesia, a large free-ranging population of long-tailed macaques spontaneously and routinely engage in token-mediated bartering interactions with humans. These interactions occur in two phases: after stealing inedible and more or less valuable objects from humans, the macaques appear to use them as tokens, by returning them to humans in exchange for food. Our field observational and experimental data showed (i) age differences in robbing/bartering success, indicative of experiential learning, and (ii) clear behavioural associations between value-based token possession and quantity or quality of food rewards rejected and accepted by subadult and adult monkeys, suggestive of robbing/bartering payoff maximization and economic decision-making. This population-specific, prevalent, cross-generational, learned and socially influenced practice may be the first example of a culturally maintained token economy in free-ranging animals.Ye

Sleep and Diet in Urban Pregnant African American Women

ABSTRACT Objective: Sleep disturbances during pregnancy are associated with gestational diabetes and excessive weight gain. Diet could potentially play a role in these relationships, yet examinations of sleep and diet in African American pregnant populations are scarce. Methods: The study population includes pregnant African American women from Detroit, MI (n=53). At the baseline study visit during late pregnancy, women were surveyed about typical bed and wake times, as well as usual food intake via a dietary screener. Sleep measures examined included time in bed and sleep midpoint (median of going to bed and wake time). Composite dietary measures included estimated fruit and vegetable (FV), dairy, and added sugar intake. Linear regression models were used to evaluate associations between sleep and dietary measures, adjusting for potential confounders. Results: On average, women with shorter time in bed (\u3c8 hours compared to ≥8 hours) had one cup/day higher intake of fruits and vegetables (95% CI 0.10 to 1.83), driven by the individual items tomato sauce, salsa, and fruit juice. Delayed sleep timing (a midpoint\u3e2:45 AM compared to midpoint≤2:45 AM) was associated with 0.78 cup/day lower fruit and vegetable intake (95% CI -1.67 to 0.12), mostly driven by whole fruit and vegetables (e.g. string beans, peas, corn rather than salad or cooked dried beans). Later midpoint was also associated with lower dairy intake (0.41 fewer servings/day; 95% CI -0.78 to -0.04), particularly milk. Shorter time in bed was associated with higher pastry intake, and delayed sleep timing was associated with lower pastry intake. Conclusions: Sleep characteristics were uniquely associated with diet in pregnant women