A bibliometric analysis of the Journal of Molecular Graphics and Modelling

This paper reviews the articles published in Volumes 2-24 of the Journal of Molecular Graphics and Modelling (formerly the Journal of Molecular Graphics), focusing on the changes that have occurred in the subject over the years, and on the most productive and most cited authors and institutions. The most cited papers are those describing systems or algorithms, but the proportion of these types of article is decreasing as more applications of molecular graphics and molecular modelling are reported

The supermarket model with bounded queue lengths in equilibrium

In the supermarket model, there are n queues, each with a single server. Customers arrive in a Poisson process with arrival rate λn , where λ=λ(n)∈(0,1) . Upon arrival, a customer selects d=d(n) servers uniformly at random, and joins the queue of a least-loaded server amongst those chosen. Service times are independent exponentially distributed random variables with mean 1. In this paper, we analyse the behaviour of the supermarket model in the regime where λ(n)=1−n−α and d(n)=⌊nβ⌋ , where α and β are fixed numbers in (0, 1]. For suitable pairs (α,β) , our results imply that, in equilibrium, with probability tending to 1 as n→∞ , the proportion of queues with length equal to k=⌈α/β⌉ is at least 1−2n−α+(k−1)β , and there are no longer queues. We further show that the process is rapidly mixing when started in a good state, and give bounds on the speed of mixing for more general initial conditions

Risk factors for hospitalizations associated with depression among women during the years around a birth: a retrospective cohort study

Introduction Socio-economic status (SES) is an important determinant of health and low SES is associated with higher rates of prenatal and post-partum depression while prenatal and post-partum depression are associated with sub-optimal maternal and infant health. Furthermore, increased negative effects of post-partum depression have been reported in children from low SES backgrounds. Objectives To assess whether socio-economic status (SES) was related to the risk of a medical or psychiatric hospitalization associated with depression (HAWD) and the risk of a HAWD by anti-depressant (AD) use during the years around a birth Methods This retrospective cohort study used linked birth, hospitalization, prescription and tax-file records of the study cohort. We linked registry data of 243,933 women delivering 348,273 live infants in British Columbia (1999-2009). The outcomes of interest were a HAWD and a HAWD and the associated patient anti-depressant (AD) use. Ranked area-based measures of equivalised, family disposable income were used to create income deciles (Decile-1 low), our proxy for SES. Mothers from Decile-6 were the comparator group. Anti-depressant use was defined as having a prenatal prescription for a serotonin reuptake inhibitor or other AD and the years around a birth were the period beginning 12 months before conception and ending 12 months after the birth. We analysed by pregnancy using mixed effects logistic regression whilst adjusting for maternal age and parity. Results                                                                                    Compared to middle-income mothers from Decile-6, (Decile-1, Decile-2) mothers from low income neighbourhoods had increased odds of HAWDs [aOR=1.77(CI: 1.43, 2.19); aOR=1.56(CI: 1.26, 1.94)]. Mothers from low income areas with depression and no AD use had even higher odds of HAWDs [aOR=1.83(CI: 1.33, 2.20); aOR=1.71(CI: 1.33, 2.20)]. Conclusions Results provide preliminary evidence that barriers to treating depression with ADs in mothers from low income areas during the years around a birth might contribute to their increased risk of a hospitalization associated with non-pharmacologically treated depression. Further research is implicated to further elucidate the origins of this increased risk

Electroflotation of ultrafine chalcopyrite particles with sodium oleate collector

The electroflotation behaviour of ultrafine chalcopyrite particles was investigated using a mechanically agitated cell. The use of sodium oleate as collector proved effective in the flotation of particles of average size of 5 µm. The results showed that chalcopyrite recovery increases with increasing pulp pH, and current density, but decreases with increasing pulp density. The successful flotation of chalcopyrite with oleate might be attributed to its electrochemical surface oxidation, resulting in the formation of cupric and ferric oxide species. Chemisorption of oleate ions onto oxidized chalcopyrite surface is suggested to be the main cause for the increase in chalcopyrite recovery

Early mortality and primary causes of death in mothers of children with ID or ASD: a retrospective cohort study

INTRODUCTION: Mothers of children with intellectual disability or autism spectrum disorder (ASD) have poorer health than other mothers. Yet no research has explored whether this poorer health is reflected in mortality rates or whether certain causes of death are more likely. We aimed to calculate the hazard ratios for death and for the primary causes of death in mothers of children with intellectual disability or ASD compared to other mothers. METHODS: The study population comprised all mothers of live-born children in Western Australia from 1983-2005. We accessed state-wide databases which enabled us to link socio-demographic details, birth dates, diagnoses of intellectual disability or ASD in the children and dates and causes of death for all mothers who had died prior to 2011. Using Cox Regression with death by any cause and death by each of the three primary causes as the event of interest, we calculated hazard ratios for death for mothers of children intellectual disability or ASD compared to other mothers. RESULTS AND DISCUSSION: During the study period, mothers of children with intellectual disability or ASD had more than twice the risk of death. Mothers of children with intellectual disability were 40% more likely to die of cancer; 150% more likely to die of cardiovascular disease and nearly 200% more likely to die from misadventure than other mothers. Due to small numbers, only hazard ratios for cancer were calculated for mothers of children with ASD. These mothers were about 50% more likely to die from cancer than other mothers. Possible causes and implications of our results are discussed. CONCLUSION: Similar studies, pooling data from registries elsewhere, would improve our understanding of factors increasing the mortality of mothers of children with intellectual disability or ASD. This would allow the implementation of informed services and interventions to improve these mothers' longevity