A Spectro-photometric Analysis of Cool White Dwarfs in the Gaia and Pan-STARRS Footprint

We present a spectro-photometric analysis of 2880 cool white dwarfs within 100 pc of the Sun and cooler than Teff = 10,000 K, with grizy Pan-STARRS photometry and Gaia trigonometric parallaxes available. We also supplement our data sets with near-infrared JHK photometry, when available, which is shown to be essential for interpreting the coolest white dwarfs in our sample. We perform a detailed analysis of each individual object using state-of-the-art model atmospheres appropriate for each spectral type including DA, DC, DQ, DZ, He-rich DA, and the so-called IR-faint white dwarfs. We discuss the temperature and mass distributions of each subsample, as well as revisit the spectral evolution of cool white dwarfs. We find little evidence in our sample for the transformation of a significant fraction of DA stars into He-atmosphere white dwarfs through the process of convective mixing between Teff = 10,000 K and 6500 K, although the situation changes drastically in the range Teff = 6500 - 5500 K where the fraction of He-atmosphere white dwarfs reaches 45%. However, we also provide strong evidence that at even cooler temperatures (Teff < 5200 K), most DC white dwarfs have H atmospheres. We discuss a possible mechanism to account for this sudden transformation from He- to H-atmosphere white dwarfs involving the onset of crystallization and the occurrence of magnetism. Finally, we also argue that DQ, DZ, and DC white dwarfs may form a more homogeneous population than previously believed.Comment: Accepted for publication in MNRAS (21 pages, 20 figures

Sewage disposal in the Musi-River, India: water quality remediation through irrigation infrastructure

The disposal of untreated urban sewage in to open water bodies is common in most developing countries. This poses potential negative consequences to public health and agricultural sustainability. Hyderabad, one of India's largest cities, disposes large amounts of its wastewater untreated into the Musi River, from where it is used, with the aid of irrigation weirs, for agricultural production. This paper presents a 14 month (December 2003 - January 2005) water quality survey which aimed to quantify spatial and temporal changes in key water quality parameters along a 40 km stretch of the Musi River. The survey found that river water quality improved dramatically with distance from the city; from untreated sewage in the city to irrigation water safe for use in agriculture 40 km downstream of the city. This improvement was contributed to by different treatment processes caused or aided by the irrigation weirs placed on the river. © 2009 Springer Science+Business Media B.V

SARS-CoV-2 in pediatric cancer: a systematic review

The outbreak of the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in December 2019 in Wuhan challenges pediatric oncologists in an unexpected way. We provide a comprehensive overview, which systematically summarizes and grades evidence (QoE) on SARS-CoV-2 infections in pediatric cancer patients at 1.5 years of pandemic. A systematic literature search in PubMed combined with an additional exploratory literature review in other international databases was conducted to identify studies on children (aged < 18 years) with a malignant disease and COVID-19 infections. In total, 45 reports on 1003 pediatric cancer patients with SARS-CoV-2 infections were identified out of 1397 reports analyzed. The clinical course of COVID-19 was reported mild or moderate in 358 patients (41.7%), whereas 11.1% of patients showed severe COVID-19. In 12.7% of patients, chemotherapy was postponed, whereas 19% of patients with different underlying malignancies received chemotherapy during SARS-CoV-2 infection. Twenty-five patients with SARS-CoV-2 infections died, potentially related to COVID-19. Conclusion: Despite a favorable COVID-19 outcome in most pediatric cancer patients, the morbidity is reported higher than in children without comorbidities. However, no severe COVID-19 complications were associated to the continuation of chemotherapy in some cohort studies and reports on two patients. Therefore, the risk of cancer progress or relapse due to interruption of chemotherapy has carefully to be weighed against the risk of severe COVID-19 disease with potentially fatal outcome

Sun protection: North and South – a comparison of attitudes and behaviours of young adults in the UK and NZ: implications for UK interventions

Skin cancer rates have steadily risen in the UK, doubling approximately every twenty years. There has been no significant mass media expenditure within the UK on improving public awareness of the link between sun exposure and skin cancer risk. In countries such as New Zealand, where extensive mass media and population segment-specific interventions have run for several years, melanoma rates show a decline, suggesting that mass media interventions should be considered within the UK and other European countries to help reduce skin cancer rates. Before considering the possibility of using similar mass media-based communication strategies to those used in New Zealand, an understanding of the attitudes and beliefs that underpin existing sun protective behaviours in both countries would be beneficial. We focus on adolescents as a target as this segment has particularly poor sun protective behaviours and appears resistant to health-based interventions .We therefore compare the attitudes, beliefs and actual reported behaviours of young adults in the UK and New Zealand identifying less than optimal sun protective behaviours in both countries. The findings suggest that the UK or other countries - should not adopt similar communication strategies to New Zealand without addressing underlying normative factors underpinning behaviours

Avifauna of Boni-Dodori National Reserves, Lamu and Garissa Counties, Kenya

A comprehensive avian survey was conducted between April 2012 and November 2013 in Boni and Dodori National reserves, the connecting Aweer Community Conservancy corridor, and the adjacent forests. Survey methods were Timed Species Counts (TSCs), mist netting and opportunistic observations. Six different habitat types were identified and sampled: 1) grassland with Hyphaene palms 2) a mosaic of forest groves, grassland and Hyphaene palm savanna 3) dense thickets 4) wetlands 5) forest with dense undergrowth and 6) acacia woodlands. A total of 184 bird species was recorded, including two near threatened bird species (Southern Banded Snake Eagle Circaetus fasciolatus and Fischer’s Turaco Tauraco fischeri), 19 Palaearctic migrants, two Afrotropical migrants and 14 East African coastal biome species. There were eight forest specialist and 29 forest generalist species. We recorded sightings of a form of Red-naped Bushshrike Laniarius ruficeps that is not illustrated in bird guidebooks for Africa, and presumed to be of the subspecies kismayensis. Data from this survey led to the upgrading of the Boni-Dodori area from a potential IBA to full IBA status. Even though these forests have species of conservation importance and sufficient habitats to conserve these species, immediate actions need to be taken to ensure their protection. We recommend comprehensive biodiversity surveys in these forests in order to obtain more scientific information such as population trends to enhance the conservation of these important, but neglected sites

Wastewater use in India: the impact of irrigation weirs on water quality and farmer health

Water quality in the wastewater polluted Musi River, India was assessed in a 14 month survey, while the impact of exposure to polluted river water was assessed in an epidemiological study. The water quality survey found very high intestinal nematode and BOD concentrations in Musi water in the city of Hyderabad. Water quality improved dramatically downstream of the city as a result of irrigation weirs that were placed on the river and which promoted sedimentation. River water, at two of the selected sample points, was found to be unfit for use in agriculture based on WHO guidelines. Hookworm infection was found to be the main health risk associated with the use of polluted Musi water and a significantly increased risk of infection was found in farmers using untreated wastewater. In the absence of wastewater treatment facilities, regular anthelmintic treatment programs are recommended to protect farmer health

Age 23 years + oral health questionnaire in Avon Longitudinal Study of Parents and Children

Oral health data in large longitudinal cohort studies is rarely collected at multiple time-points. This type of data is important for assessing oral health trajectories and their determinants. This data resource includes self-report questionnaire data on up to 4,222 young adults at approximately 23 years of age from the Avon Longitudinal Study of Parents and Children (ALSPAC). The resource includes questions on dental attendance, tooth restorations and extractions, third molars (wisdom teeth) and mouth ulcers. This round of data collection follows on from similar questionnaires at ages 7, 10 and 17 years. The ALSPAC study provides an opportunity to combine this oral health data with extensive phenotype, genetic, epigenetic and metabolomic data from the participants, their mothers and fathers