Publications by authors named "J L Liggett"
Sulphate (SO), predominantly derived from sulphur (S)-bearing glacial sediments distributed widely across the Canadian Interior Plains, contributes to high groundwater salinity and can be detrimental to riparian and dry-land ecosystems, agricultural production, and water use. While previous researchers investigated SO distribution and dynamics in shallow groundwater at local scales (<1500 km), we examine SO occurrence in groundwater at larger scales, and to depths of ∼150 m, considering variations in geology, glacial history, climate, and geochemical and hydrogeological settings in the Canadian province of Alberta. Sulphate concentrations in groundwater vary considerably, with 15 % of 139,130 samples above the 500 mg/L Canadian drinking water aesthetic objective.
View Article and Find Full Text PDFDuctile iron and copper coupons were aged 137-189 days and 2 days, respectively, with 2 mg Cl L monochloramine under four water chemistries (pH 7 or 9 and 0 or 3 mg L orthophosphate). Subsequently, microelectrode profiles of monochloramine concentration, oxygen concentration, and pH were measured from the bulk water to near the coupon reactive surface, allowing estimation of flux and apparent surface reaction rate constants for monochloramine and oxygen. Both metals showed similar trends with orthophosphate where orthophosphate decreased metal reactivity with monochloramine (pH 9) and oxygen (pH 7).
View Article and Find Full Text PDFArticle Synopsis
- The study aimed to improve colorectal cancer (CRC) screening by developing a tailored algorithm that combines the fecal immunochemical test (FIT) with blood test results and patient age to better identify individuals needing a colonoscopy.
- The research involved 1977 participants from Denmark who were FIT-positive and examined eight blood-based biomarkers, discovering that the new algorithm outperformed the traditional FIT-only model in accurately distinguishing between CRC and non-CRC cases.
- The results indicated that using the combined algorithm could enhance patient selection for colonoscopy, potentially reducing unnecessary procedures and improving healthcare efficiency.
Article Synopsis
- * The research found that Cu pipes showed less reactivity to DO and FC than aged DI pipes, especially after brief exposure (2 days) compared to long-term (154-190 days) for DI pipes.
- * The presence of orthophosphate helped stabilize pH levels at the surface of aged DI pipes, reducing significant fluctuations that otherwise occurred without it.
Background: The Military Health System (MHS) is a universal health care system, in which health care disparities are theoretically minimized. This study aimed to identify disparities and assess their impact on the initiation of timely treatment for breast cancer within a universally insured population.
Methods: A retrospective cohort study was performed to evaluate the treatment of female breast cancer patients ≥18 years of age within the MHS from January 1, 2014, to December 31, 2018.