Endemic invasive amoebiasis in northern Australia

In October 2000, a 10-year-old Aboriginal boy from the Darwin region of the Northern Territory was referred to hospital with a 24-hour history of abdominal pain, initially generalised, but then localising to the right iliac fossa. The pain was accompanied by occasional vomiting, but no fever or diarrhoea was noted. At laparotomy, a gangrenous, unruptured appendix was removed. Postoperatively, the patient made a good recovery. Neither he nor any family members had travelled outside the Northern Territory.Histological sections of the surgical specimen showed changes typical of acute suppurative appendicitis. Closer examination, however, revealed numerous round-to-oval structures resembling trophozoites (see Box). When the possibility of invasive amoebiasis was raised, staining of the section with Entamoeba histolytica-specific sera confirmed the diagnosis. E. histolytica serology was negative

“Yes, but…” Yes, and…” - A Sympathetic Challenge (and Reframing) of Matusov’s “The Right for Freedom of Education.”

In this response to Matusov's "Right for Freedom in Education," I will offer two “yes, but…” concerns about crucial complexities of this freedom that I think Matusov leaves unaddressed, and a “yes, and…” alternative pragmatic justification of this freedom that differs from, but I think is more compelling than, Matusov’s

Disk Detective: Discovery of New Circumstellar Disk Candidates through Citizen Science

The Disk Detective citizen science project aims to find new stars with 22 micron excess emission from circumstellar dust using data from NASA's WISE mission. Initial cuts on the AllWISE catalog provide an input catalog of 277,686 sources. Volunteers then view images of each source online in 10 different bands to identify false-positives (galaxies, background stars, interstellar matter, image artifacts, etc.). Sources that survive this online vetting are followed up with spectroscopy on the FLWO Tillinghast telescope. This approach should allow us to unleash the full potential of WISE for finding new debris disks and protoplanetary disks. We announce a first list of 37 new disk candidates discovered by the project, and we describe our vetting and follow-up process. One of these systems appears to contain the first debris disk discovered around a star with a white dwarf companion: HD 74389. We also report four newly discovered classical Be stars (HD 6612, HD 7406, HD 164137, and HD 218546) and a new detection of 22 micron excess around a previously known debris disk host star, HD 22128.Comment: 50 pages, accepted for publication in the Astrophysical Journa

Bioassay Determination of Species Specific Phytoplankton Responses To The Herbicide Atrazine and Its Quantification in B. Everett Jordan Reservoir

Atrazine was quantified bi-weekly in samples from three locations in B. Everett Jordan Lake during March-July 1985 using gas chromatography. The presence in Segment 1 of atrazine and other previously identified Haw River constituents was verified by GC/MS. The highest concentrations were consistently found in Segment 1 (0.5-2.5 ug/L) and residue concentrations were generally higher in Segment 2 than Segment 3. Although atrazine concentrations declined rather rapidly following the field application runoff pulse in May, herbicide residue levels remained higher than those prior to that date. In vitro, natural population bioassays revealed species specific responses to atrazine. The population as a whole was severely inhibited at 50 ug/L atrazine. Results suggest low-dose (1 ug/L) growth stimulation for several members of the Cyanophyta. Several species of the Chlorophyta exhibited temporal growth lags at atrazine concentrations of 50 ug/L. However, maximum biomass was not severely depressed. Other species of green algae, Chlamydomonas in particular, exhibited resistance to the effects of atrazine at all doses. Competitive interactions between species affected individual responses to the toxicant. Species specific responses to atrazine levels commonly found in agricultural watersheds (0.25-10 ug/L) illustrate the potential of this important herbicide to alter the ecological basis of the food web.Master of Science in Public Healt

A multi-decade record of high quality fCO2 data in version 3 of the Surface Ocean CO2 Atlas (SOCAT)

The Surface Ocean CO2 Atlas (SOCAT) is a synthesis of quality-controlled fCO2 (fugacity of carbon dioxide) values for the global surface oceans and coastal seas with regular updates. Version 3 of SOCAT has 14.7 million fCO2 values from 3646 data sets covering the years 1957 to 2014. This latest version has an additional 4.6 million fCO2 values relative to version 2 and extends the record from 2011 to 2014. Version 3 also significantly increases the data availability for 2005 to 2013. SOCAT has an average of approximately 1.2 million surface water fCO2 values per year for the years 2006 to 2012. Quality and documentation of the data has improved. A new feature is the data set quality control (QC) flag of E for data from alternative sensors and platforms. The accuracy of surface water fCO2 has been defined for all data set QC flags. Automated range checking has been carried out for all data sets during their upload into SOCAT. The upgrade of the interactive Data Set Viewer (previously known as the Cruise Data Viewer) allows better interrogation of the SOCAT data collection and rapid creation of high-quality figures for scientific presentations. Automated data upload has been launched for version 4 and will enable more frequent SOCAT releases in the future. High-profile scientific applications of SOCAT include quantification of the ocean sink for atmospheric carbon dioxide and its long-term variation, detection of ocean acidification, as well as evaluation of coupled-climate and ocean-only biogeochemical models. Users of SOCAT data products are urged to acknowledge the contribution of data providers, as stated in the SOCAT Fair Data Use Statement. This ESSD (Earth System Science Data) “living data” publication documents the methods and data sets used for the assembly of this new version of the SOCAT data collection and compares these with those used for earlier versions of the data collection (Pfeil et al., 2013; Sabine et al., 2013; Bakker et al., 2014). Individual data set files, included in the synthesis product, can be downloaded here: doi:10.1594/PANGAEA.849770. The gridded products are available here: doi:10.3334/CDIAC/OTG.SOCAT_V3_GRID