Rising organic charge in northern freshwaters is attributed to increasing levels of dissolved natural organic matter (DNOM) and changes in water chemistry. Organic charge concentration may be ...determined through charge balance calculations (Org.−) or modelled (OAN−) using the Oliver and Hruška conceptual models, which are based on the density of weak acid functional sites (SD) present in DNOM. The charge density (CD) is governed by SD as well as protonation and complexation reactions on the functional groups. These models use SD as a key parameter to empirically fit the model to Org.−. Utilizing extensive water chemistry datasets, this study shows that spatial and temporal differences in SD and CD are influenced by variations in the humic-to-fulvic ratio of DNOM, organic aluminum (Al) complexation, and the mole fraction of CD to SD, which is governed by acidity. The median SD values obtained for 44 long-term monitored acid-sensitive lakes were 11.1 and 13.9 µEq/mg C for the Oliver and Hruška models, respectively. Over 34 years of monitoring, the CD increased by 70%, likely due to rising pH and declining Al complexation with DNOM. Present-day median SD values for the Oliver and Hruška models in 16 low-order streams are 13.8 and 15.8 µEq/mg C, respectively, and 10.8 and 12.5 µEq/mg C, respectively, in 10 high-order rivers.
The myth of autoimmunity Monif, Gilles R.G.
Medical hypotheses,
December 2018, 2018-Dec, 2018-12-00, 20181201, Letnik:
121
Journal Article
Recenzirano
Within the more than one hundred disease entities for which autoimmunity causation have been alleged, two subgroups can be identified. The first group is characterized by ability of disruption of the ...effector arm of the immune response to temporarily reverse the signs and symptoms of disease. The second group is characterized by the presence of antibodies directed against the target organ’s cellular or subcellular components. As long as therapeutic palliation of the signs and symptoms of disease can be achieved, attributing causation to autoimmunity has tended to arrest therapeutics focus on attaining cure. Data relevant to a prime disease entity within each of the two allegedly autoimmune disease, Crohn’s disease and Type 1 diabetes mellitus, refute the claim of autoimmunity. In particular, the events that combine to produce Crohn’s disease have identified a mechanism by which a dysfunctional immune-mediated response against a specific set of antigens/agent can produces disease. Identification of this mechanism opens to rethinking the pathogenesis of other classic autoimmune diseases within that 5 subgroup.
Infectious Diseases Incorporated (IDI) is an infectious disease think-tank, established in 1973. Crohn’s disease (CD) is a chronic, recurrent disease of the gastrointestinal tract that has reached ...epidemic proportions within industrialized nations. CD is said to be without cure. Since 2003, therapeutic interventions have focused on disruption of the pro-inflammatory Th1 response against an unknown antigen. In 2015, the Hruska Postulate was introduced and, in so doing, explained how, in the absence of acquired immunity, newborn infection by Mycobacterium avium subspecies paratuberculosis could cause fixation of the immune system’s Th1 response against the organism. The Hruska Postulate was utilized to answer all the documented epidemiological facts embedded in the natural history of Crohn’s disease and, in particular, why breastfeeding confers protection against the future development of Crohn’s disease. It is Infectious Diseases Incorporated’s (IDI) stated opinion that Crohn’s disease is both preventable and curable if treated appropriately in its early stages.
Bradley J Hruska in the November 2011 issue of Update: Applications of Research in Music Education writes that there is perhaps no larger influence on student achievement today than motivation. In ...his article, Hruska offers research-based suggestions for high school music teachers to help them encourage their students to become more motivated through mastery learning goals. The piece also explores how student leadership opportunities can promote mastery learning.
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