Urea treatment affects safe rates of seed placed nitrogen in Saskatchewan

Non-Peer ReviewedPlacing urea in close proximity to seed can cause seedling damage resulting in poor crop establishment. Plant densities are often well below the optimum, and plants that do emerge can exhibit poor vigor. Several strategies have been developed to reduce risk of seed damage from urea. Restricting the amount that is seed placed, placing urea at a safe distance and placement before or after seeding are effective but may not allow for application of adequate N or increase equipment and operating costs. Recently treatments applied to the urea granule such as Agrotain and polymer coating have been developed to slow the conversion to ammonium. Research suggests that the safe rate of N can be increased by 50% where Agrotain is used and are less clear when polymer coatings are used. To demonstrate how Agrotain and polymer treated urea affect crop establishment and yield, rates of 0, 1, 1.5, 2 and 4 times the recommended safe rate were seed placed at Scott, Swift Current, Canora and Redvers, Saskatchewan. Trials were conducted with wheat at all locations, and canola at Scott. Seed placed untreated urea was used as a check. As well, an alternate option using seed placed untreated urea followed by liquid urea ammonium nitrate dribble banded 20 to 35 days after seeding was investigated. Impact of treatments on plant density varied with rainfall across locations. Sites with lower precipitation after seeding indicated more severe damage to seedlings. Untreated urea placed with the seed had the greatest impact on plant density but, Agrotain and polymer treatments also led to decreases at high N rates. The improvement of Agrotain over untreated urea generally confirmed manufacturer recommendations that safe rates of seed placed urea can be increased by about 50%. The polymer was very effective at reducing damage from seed placed urea, but still generally resulted in fewer plants than side band at 4 times the recommended rate of N. Grain yield responses were also variable across locations. At most sites where plant stand reductions were high yield was also affected. Differences between all treatments were small at N rates up to 2 times the recommended rate but at 4 times, yield was reduced for Agrotain treated and untreated seed placed N. For treatments where liquid dribble band was compared to side banding little difference in yield was observed when soil residual N was high and precipitation was low. A reduction in yield was found when soil N and precipitation were low. Where the N supply from soil was large and precipitation higher, yield of dribble banded crop continued to respond after side banded crops had peaked

Association between congenital toxoplasmosis and preterm birth, low birthweight and small for gestational age birth.

OBJECTIVE: To determine the association between congenital toxoplasmosis and preterm birth, low birthweight and small for gestational age birth. DESIGN: Multicentre prospective cohort study. SETTING: Ten European centres offering prenatal screening for toxoplasmosis. POPULATION: Deliveries after 23 weeks of gestation in 386 women with singleton pregnancies who seroconverted to toxoplasma infection before 20 weeks of gestation. Deliveries after 36 weeks in 234 women who seroconverted at 20 weeks or later, and tested positive before 37 weeks. METHODS: Comparison of infected and uninfected births, adjusted for parity and country of birth. MAIN OUTCOME MEASURES: Differences in gestational age at birth, birthweight and birthweight centile. RESULTS: Infected babies were born or delivered earlier than uninfected babies: the mean difference for seroconverters before 20 weeks was -5.4 days (95% CI: -1.4, -9.4), and at 20 weeks or more, -2.6 days (95% CI: -0.5, -4.7). Congenital infection was associated with an increased risk of preterm delivery when seroconversion occurred before 20 weeks (OR 4.71; 95% CI: 2.03, 10.9). No significant differences were detected for birthweight or birthweight centile. CONCLUSION: Babies with congenital toxoplasmosis were born earlier than uninfected babies but the mechanism leading to shorter length of gestation is unknown. Congenital infection could precipitate early delivery or prompt caesarean section or induction of delivery. We found no evidence for a significant association between congenital toxoplasmosis and reduced birthweight or small for gestational age birth

Multiplex quantitative PCR for single-reaction genetically modified (GM) plant detection and identification of false-positive GM plants linked to Cauliflower mosaic virus (CaMV) infection.

BACKGROUND:Most genetically modified (GM) plants contain a promoter, P35S, from the plant virus, Cauliflower mosaic virus (CaMV), and many have a terminator, TNOS, derived from the bacterium, Agrobacterium tumefaciens. Assays designed to detect GM plants often target the P35S and/or TNOS DNA sequences. However, because the P35S promoter is derived from CaMV, these detection assays can yield false-positives from non-GM plants infected by this naturally-occurring virus. RESULTS:Here we report the development of an assay designed to distinguish CaMV-infected plants from GM plants in a single multiplexed quantitative PCR (qPCR) reaction. Following initial testing and optimization via PCR and singleplex-to-multiplex qPCR on both plasmid and plant DNA, TaqMan qPCR probes with different fluorescence wavelengths were designed to target actin (a positive-control plant gene), P35S, P3 (a CaMV-specific gene), and TNOS. We tested the specificity of our quadruplex qPCR assay using different DNA extracts from organic watercress and both organic and GM canola, all with and without CaMV infection, and by using commercial and industrial samples. The limit of detection (LOD) of each target was determined to be 1% for actin, 0.001% for P35S, and 0.01% for both P3 and TNOS. CONCLUSIONS:This assay was able to distinguish CaMV-infected plants from GM plants in a single multiplexed qPCR reaction for all samples tested in this study, suggesting that this protocol is broadly applicable and readily transferrable to any interested parties with a qPCR platform

Disparities in pre-eclampsia and eclampsia among immigrant women giving birth in six industrialised countries

OBJECTIVE: To assess disparities in pre-eclampsia and eclampsia among immigrant women from various world regions giving birth in six industrialised countries. DESIGN: Cross-country comparative study of linked population-based databases. SETTING: Provincial or regional obstetric delivery data from Australia, Canada, Spain and the USA and national data from Denmark and Sweden. POPULATION: All immigrant and non-immigrant women delivering in the six industrialised countries within the most recent 10-year period available to each participating centre (1995–2010). METHODS: Data was collected using standardised definitions of the outcomes and maternal regions of birth. Pooled data were analysed with multilevel models. Within-country analyses used stratified logistic regression to obtain odds ratios (OR) with 95% confidence intervals (95% CI). MAIN OUTCOME MEASURES: Pre-eclampsia, eclampsia and pre-eclampsia with prolonged hospitalisation (cases per 1000 deliveries). RESULTS: There were 9 028 802 deliveries (3 031 399 to immigrant women). Compared with immigrants from Western Europe, immigrants from Sub-Saharan Africa and Latin America & the Caribbean were at higher risk of pre-eclampsia (OR: 1.72; 95% CI: 1.63, 1.80 and 1.63; 95% CI: 1.57, 1.69) and eclampsia (OR: 2.12; 95% CI: 1.61, 2.79 and 1.55; 95% CI: 1.26, 1. 91), respectively, after adjustment for parity, maternal age and destination country. Compared with native-born women, European and East Asian immigrants were at lower risk in most industrialised countries. Spain exhibited the largest disparities and Australia the smallest. CONCLUSION: Immigrant women from Sub-Saharan Africa and Latin America & the Caribbean require increased surveillance due to a consistently high risk of pre-eclampsia and eclampsia

Characterization of pack cemented Ni₂Al₃ coating exposed to KCl(s) induced corrosion at 600 °C

Oxidation of Ni2Al3 produced by pack aluminizing of pure nickel was studied with and without 0.10 mg cm(-2) KCl(s) deposit in an environment containing 5% O-2, 40% H2O and 55% N-2 at 600 degrees C for up to 168 h. Oxide microstructure and composition was investigated by SEM/EDX, BIB, TEM and GDOES. Oxidised Ni2Al3 shows minimal weight gain, while adding KCl results in a small weight loss consistent with evaporation of KCl. On the surface of samples exposed to the gas environment only, a 30 nm oxide of Al oxide was present, but where KCl was present as deposit, 50-250 nm thick nodules form that are enriched in K, O and Al

Internal and external cooling methods and their effect on body temperature, thermal perception and dexterity

© 2018 The Authors. Published by PLOS. This is an open access article available under a Creative Commons licence. The published version can be accessed at the following link on the publisher’s website: https://doi.org/10.1371/journal.pone.0191416© 2018 Maley et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Objective The present study aimed to compare a range of cooling methods possibly utilised by occupational workers, focusing on their effect on body temperature, perception and manual dexterity. Methods Ten male participants completed eight trials involving 30 min of seated rest followed by 30 min of cooling or control of no cooling (CON) (34C, 58% relative humidity). The cooling methods utilised were: ice cooling vest (CV0), phase change cooling vest melting at 14C (CV14), evaporative cooling vest (CVEV), arm immersion in 10C water (AI), portable water-perfused suit (WPS), heliox inhalation (HE) and ice slushy ingestion (SL). Immediately before and after cooling, participants were assessed for fine (Purdue pegboard task) and gross (grip and pinch strength) manual dexterity. Rectal and skin temperature, as well as thermal sensation and comfort, were monitored throughout. Results Compared with CON, SL was the only method to reduce rectal temperature (P = 0.012). All externally applied cooling methods reduced skin temperature (P0.05). Conclusion The present study observed that ice ingestion or ice applied to the skin produced the greatest effect on rectal and skin temperature, respectively. AI should not be utilised if workers require subsequent fine manual dexterity. These results will help inform future studies investigating appropriate pre-cooling methods for the occupational worker.This project is financially supported by the US Government through the Technical Support Working Group within the Combating Terrorism Technical Support Office.Published versio

Selective serotonin reuptake inhibitor prescribing before, during and after pregnancy:a population-based study in six European regions

ObjectiveTo explore the prescribing patterns of selective serotonin reuptake inhibitors (SSRIs) before, during and after pregnancy in six European population-based databases.DesignDescriptive drug utilisation study.SettingSix electronic healthcare databases in Denmark, the Netherlands, Italy (Emilia Romagna/Tuscany), Wales and the rest of the UK.PopulationAll women with a pregnancy ending in a live or stillbirth starting and ending between 2004 and 2010.MethodsA common protocol was implemented across databases to identify SSRI prescriptions issued (UK) or dispensed (non-UK) in the year before, during or in the year following pregnancy.Main outcome measuresThe percentage of deliveries in which the woman received an SSRI prescription in the year before, during or in the year following pregnancy. We also compared the choice of SSRIs and changes in prescribing over the study period.ResultsIn total, 721 632 women and 862943 deliveries were identified. In the year preceding pregnancy, the prevalence of SSRI prescribing was highest in Wales [9.6%; 95% confidence interval (CI95), 9.4-9.8%] and lowest in Emilia Romagna (3.3%; CI95, 3.2-3.4%). During pregnancy, SSRI prescribing had dropped to between 1.2% (CI95, 1.1-1.3%) in Emilia Romagna and 4.5% (CI95, 4.3-4.6%) in Wales. The higher UK pre-pregnancy prescribing rates resulted in higher first trimester exposures. After pregnancy, SSRI prescribing increased most rapidly in the UK. Paroxetine was more commonly prescribed in the Netherlands and Italian regions than in Denmark and the UK.ConclusionsThe higher SSRI prescribing rates in the UK, compared with other European regions, raise questions about differences in the prevalence and severity of depression and its management in pregnancy across Europe.</p