Leaf, tree and soil properties in a Eucalyptus saligna forest exhibiting canopy decline

The extent of eucalypt decline in moist coastal forests of south-eastern Australia is increasing with resultant losses in biodiversity and productivity. This survey aimed to identify factors associated with the decline of Eucalyptus saligna (Sydney Blue Gum) in Cumberland State Forest, a moist sclerophyll forest within urban Sydney. Eucalyptus saligna was the dominant overstorey species in six 20 m radius plots, which differed in floristic composition, structure and crown condition. One plot was colonised by bell miners (Manorina melanophrys). A range of leaf, tree and plot scale parameters were assessed including insect damage and free amino acid content, visual crown condition, floristics and soil chemistry. The plot permanently colonised by bell miners also had Eucalyptus saligna trees in the poorest condition. Both the weed Lantana camara and the soil pathogen Phytophthora cinnamomi were present in some of the plots but neither was strongly consistent with the severity of crown decline. There were, however, significant correlations among the foliar traits of insect damage, free amino acid content and relative chlorophyll content. Free amino acid content differed significantly between leaf age cohorts. Plots differed notably in topsoil organic matter and soil nitrogen, but the plot with the poorest visual crown condition score had intermediate mean values for both soil properties within the ranges presented by the six plots. Overall, crown condition score was weakly negatively correlated with topsoil organic carbon and total nitrogen content. The unhealthiest plot also had the highest density of shrubby understorey. Site factors that could influence both the quantity and quality of foliage (e.g. free amino acid content) in eucalypt crowns, and hence the population dynamics of herbivorous insects and bell miners, are discussed in relation to Eucalyptus saligna crown decline

Intrapartum epidural analgesia and breastfeeding: a prospective cohort study

BACKGROUND Anecdotal reports suggest that the addition of fentanyl (an opioid) to epidural analgesia for women during childbirth results in difficulty establishing breastfeeding. The aim of this paper is to determine any association between epidural analgesia and 1) breastfeeding in the first week postpartum and 2) breastfeeding cessation during the first 24 weeks postpartum. METHODS A prospective cohort study of 1280 women aged > or = 16 years, who gave birth to a single live infant in the Australian Capital Territory in 1997 was conducted. Women completed questionnaires at weeks 1, 8, 16 and 24 postpartum. Breastfeeding information was collected in each of the four surveys and women were categorised as either fully breastfeeding, partially breastfeeding or not breastfeeding at all. Women who had stopped breastfeeding since the previous survey were asked when they stopped. RESULTS In the first week postpartum, 93% of women were either fully or partially breastfeeding their baby and 60% were continuing to breastfeed at 24 weeks. Intrapartum analgesia and type of birth were associated with partial breastfeeding and breastfeeding difficulties in the first postpartum week (p < 0.0001). Analgesia, maternal age and education were associated with breastfeeding cessation in the first 24 weeks (p < 0.0001), with women who had epidurals being more likely to stop breastfeeding than women who used non-pharmacological methods of pain relief (adjusted hazard ratio 2.02, 95% CI 1.53, 2.67). CONCLUSION Women in this cohort who had epidurals were less likely to fully breastfeed their infant in the few days after birth and more likely to stop breastfeeding in the first 24 weeks. Although this relationship may not be causal, it is important that women at higher risk of breastfeeding cessation are provided with adequate breastfeeding assistance and support.Christine Roberts is supported by a National Health and Medical Research Council (NHMRC) of Australia Public Health Practitioner Fellowship and Siranda Torvaldsen is supported by a NHMRC Australian Research Training Fellowship. The cohort study was supported by a project grant from The Canberra Hospital Private Practice Fund. Additional funding was provided by The Canberra Hospital Auxiliary, the Nurses' Board of the Australian Capital Territory, and the Australian Capital Territory Department of Health & Community Care

Australian national birthweight percentiles by sex and gestational age, 1998-2007

Objective: To present updated national birthweight percentiles by gestational age for male and female singleton infants born in Australia. Design and setting: Cross-sectional population-based study of 2.53 million singleton live births in Australia between 1998 and 2007. Main outcome measures: Birthweight percentiles by gestational age and sex. Results: Between 1998 and 2007, women in Australia gave birth to 2 539 237 live singleton infants. Of these, 2 537 627 had a gestational age between 20 and 44 weeks, and sex and birthweight data were available. Birthweight percentiles are presented by sex and gestational age for a total of 2 528 641 births, after excluding 8986 infants with outlying birthweights. Since the publication of the previous Australian birthweight percentiles in 1999, median birthweight for term babies has increased between 0 and 25 g for boys and between 5 g and 45 g for girls. Conclusions: There has been only a small increase in birthweight percentiles for babies of both sexes and most gestational ages since 1991-1994. These national percentiles provide a current Australian reference for clinicians and researchers assessing weight at birth

Faraday rotation maps of disk galaxies

Faraday rotation is one of the most widely used observables to infer the strength and configuration of the magnetic field in the ionised gas of the Milky Way and nearby spiral galaxies. Here we compute synthetic Faraday rotation maps at $z=0$ for a set of disk galaxies from the Auriga high-resolution cosmological simulations, for different observer positions within and outside the galaxy. We find that the strength of the Faraday rotation of our simulated galaxies for a hypothetic observer at the solar circle is broadly consistent with the Faraday rotation seen for the Milky Way. The same holds for an observer outside the galaxy and the observed signal of the nearby spiral galaxy M51. However, we also find that the structure and angular power spectra of the synthetic all-sky Faraday rotation maps vary strongly with azimuthal position along the solar circle. We argue that this variation is a result of the structure of the magnetic field of the galaxy that is dominated by an azimuthal magnetic field ordered scales of several kpc, but has radial and vertical magnetic field components that are only ordered on scales of 1-2 kpc. Because the magnetic field strength decreases exponentially with height above the disk, the Faraday rotation for an observer at the solar circle is dominated by the local environment. This represents a severe obstacle for attempts to reconstruct the global magnetic field of the Milky Way from Faraday rotation maps alone without including additional observables.Comment: 10 pages, 10 figures, accepted by MNRA

Donated human milk use and subsequent feeding pattern in neonatal units

Background: Donated human milk (DHM) is a safe alternative in the absence of mother’s own milk (MOM); however, specific clinical indications for DHM use and its impact on subsequent feeding practice remain unclear. We aimed to audit local DHM use and explore the impact of the introduction of DHM as the first enteral feed on subsequent MOM availability. Methods: We retrospectively audited DHM recipients nursed in Royal Hospital for Children, Glasgow from 2014 to 2016 against local guidelines. Data were collected from an operational electronic database. Descriptive data analysis was performed to describe DHM use. To explore the association between the first human milk feed with subsequent MOM availability Kruskal Wallis test was used. Adjustments for confounding variables were performed using analysis of variance (ANOVA). Results: A total of 165 recipients of DHM (5.3% of all admission to RHC) were identified. The majority of recipients (69%) were born &lt; 32 weeks of gestation. The main indication for DHM was prematurity, other indications included congenital anomalies of bowel and heart. The local guideline was adhered to in 87% of cases. The median interquartile range (IQR) at DHM introduction was 6 days (3, 17) and the duration of use was 12 days (6, 22). In those born &lt; 32 weeks of gestation the type of human milk (DHM and/ or MOM) used as first feed did not influence the subsequent median IQR days of feeding with any MOM [DHM 40 (9, 51); MOM 28 (17, 49), MOM &amp; DHM 17 (10, 26) p value = 0.465] after adjusting for birthweight and length of hospital stay. Conclusions: In our unit, DHM is mainly used in preterm neonates in accordance with existing local guidance. Using DHM as first milk feed did not affect subsequent MOM availability

Intensive Referral of Veterans to Mutual-Help Groups: A Mixed-Methods Implementation Evaluation

Community-based support group participation protects against substance use disorder (SUD) relapse, but referrals during treatment are inconsistently delivered and may not acknowledge barriers facing rural patients. This formative evaluation of a rural intensive referral intervention (RAIR) to community-based support groups for veterans seeking SUD treatment surveyed patients (N = 145) and surveyed and interviewed treatment staff (N = 28). Patients and staff did not differ significantly on quantitative ratings of the helpfulness of, or satisfaction with, seven RAIR components, but staff did not deliver the intervention consistently or as designed, citing two themes: lack of commitment and lack of resources

Intensive Referral to Mutual-Help Groups: A Field Trial of Adaptations for Rural Veterans

Objective: A multisite field trial testing whether improved outcomes associated with intensive referral to mutual help groups (MHGs) could be maintained after the intervention was adapted for the circumstances and needs of rural veterans in treatment for substance use disorder (SUD). Methods: In three Veterans Affairs treatment programs in the Midwest, patients (N = 195) received standard referral (SR) or rural-adapted intensive referral (RAIR) and were measured at baseline and 6-month follow-up. Results: Both groups reported significant improvement at 6 months but no significant differences between SR and RAIR groups in MHG participation, substance use, addiction severity, and posttraumatic stress symptoms. Inconsistent delivery of the intervention resulted in only one-third of the RAIR group receiving the full three sessions, but this group reported significantly greater 6-month abstinence from alcohol than those receiving no sessions. Conclusion: Further research should explore implementation problems and determine whether consistent delivery of the intervention enhances 12-step facilitation. Practice implications: The addition of rural-specific elements to the original intensive referral intervention has not been shown to increase its effectiveness among rural veterans