Toxic Rhetoic of the Online Incel Culture

Graduate Textual or Investigativ

Toxicity of Pb and of Pb/Cd combination on the springtail Folsomia candida in natural soils: Reproduction, growth and bioaccumulation as indicators

The toxicity of Pb and Cd+Pb was assessed on the Collembola F. candida in two cultivated soils (SV and AU) with low organic matter (OM) content and circumneutral to basic pH, and an acid forested soil (EPC) with high OM content. Collembola reproduction and growth as well as metal content in Collembola body, in soil, exchangeable fraction and soil solutions, pH and DOC were investigated. Pb and Cd+Pb were the highest in exchangeable fraction and soil solution of the acidic soils. Soil solution pH decreased after metal spiking in every soil due to metal adsorption, which was similar for Cd and the highest in AU for Pb. With increasing Pb and Cd+Pb, the most important reproduction decrease was in EPC soil. The LOEC for reproduction after metal addition was 2400 (Pb) and 200/2400 (Cd/Pb), 1200 and 100/1200, 300 and 100/1200 μg g−1 for AU, SV and EPC, respectively. The highest and the lowest Pb toxicity was observed for EPC and AU bulk soil, respectively. The metal in Collembola increased with increasing soil concentration, except in AU, but the decreasing BFsolution with increasing concentrations indicates a limited metal transfer to Collembola or an increased metal removal. Loading high Pb concentrations decreases Cd absorption by the Collembola, but the reverse was not true. The highest Pb toxicity in EPC can be explained by pH and OM content. Because of metal complexation, OM might have a protective role but its ingestion by Collembola lead to higher toxicity. Metal bioavailability in Collembola differs from soil solution indicating that soil solution is not sufficient to evaluate toxicity in soil organisms. The toxicity as a whole decreased when metals were combined, except for Pb in AU, due to adsorption competition between Cd and Pb on clay particles and OM sites in AU and EPC soils, respectively

Determining cadmium critical concentrations in natural soils by assessing Collembola mortality, reproduction and growth

The toxicity of cadmium for the Collembola Folsomia candida was studied by determining the effects of increasing Cd concentrations on growth, survival and reproduction in three cultivated and forested soils with different pH (4.5–8.2) and organic matter content (1.6–16.5%). The Cd concentration in soil CaCl2 exchangeable fraction, in soil solution and in Collembola body was determined. At similar total soil concentrations, the Cd concentration in soil solutions strongly decreased with increasing pH. Reproduction was the most sensitive parameter. Low organic matter content was a limiting factor for reproduction. Effect of Cd on reproduction was better described by soil or body concentrations than by soil solution concentration. Values of EC50-Repro expressed on the basis of nominal soil concentration were 182, 111 and 107 μg g−1, respectively, for a carbonated cultivated soil (AU), an acid forested soil with high organic matter (EPC) and a circumneutral cultivated soil with low organic content (SV). Sensitivity to Cd was enhanced for low OM content and acidic pH. The effect of Cd on reproduction is not directly related to Cd concentration in soil solution for carbonated soil: a very low value is found for EC50-Repro (0.17) based on soil solution for the soil with the highest pH (AU; pH=8.2). Chronic toxicity cannot be predicted on the basis of soluble fractions. Critical concentrations were 8×10−5, 1.1, 0.3 μg mL−1, respectively, for AU, EPC and SV soils

Quartermaster airborne instruction : a history of the airborne courses of instruction at the U.S. Army Quartermaster School, Fort Lee, Virginia, from their establishment in 1950 to the end of the Korean War

Since the beginning of time, man has looked to the skies for new ideas, but the first recorded recognition of the value of using air­ borne troops belongs to an American. The wily Benjamin Franklin wrote in 1784, after observing the Montgolfer brothers balloon, \u27\u27Where is the Prince who can afford to cover his country with troops for its defense as that ten thousand men descending from the clouds might not in many places do an infinite deal of mischief before a force could be brought together to repel them? The advent of a practical airplane produced a flurry of latter day prophets who saw potential of the aircraft as a combat vehicle and a means of delivering combat troops to the battle zone. A word or two is in order on the method of approach and the source materials used by the writer. For the most part, primary unpublished source materials such as files, letters, memos, speeches, and resumes of telephone conversations, and personal interviews were used in preparing the study. Only in writing Chapter I were secondary sources used. It was the intent of the writer to prepare a detailed and comprehensive account of the development of the courses of instruction using the experiences of those intimately connected with the program either as instructors, as supervisors, or as staff officers. Students were interviewed as well as course planners, administrators, and officers-in-charge. It is hoped that a detailed and fully-documented narrative of the events attending the establishment of new courses of instruction.aside from whatever contribution it will make to increasing knowledge in this area, will prove valuable to students of the military educational system and to Army Service School planners who may be called upon to establish similar courses of instruction in the future

Ringing Up A School: Mary McLeod Bethune\u27s Impact on Daytona

The limited scholarly attention given to Mary McLeod Bethune has focused either on her pioneering efforts to integrate the federal bureaucracy during the presidency of Franklin Delano Roosevelt or on her equally trailblazing work in the black women’s club movement.1 To be sure, historians have recognized Bethune as one of this country’s most important educators, but this critical aspect of her career remains imperfectly understood. This is especially true of the school that she founded for women in 1904, which became the coeducational liberal arts institution Bethune-Cookman College

Careers in music - some suggestions for the guidance of prospective music students

Thesis (M.A.)--Boston University, 1949. This item was digitized by the Internet Archive

Semantic 3D Reconstruction with Finite Element Bases

We propose a novel framework for the discretisation of multi-label problems on arbitrary, continuous domains. Our work bridges the gap between general FEM discretisations, and labeling problems that arise in a variety of computer vision tasks, including for instance those derived from the generalised Potts model. Starting from the popular formulation of labeling as a convex relaxation by functional lifting, we show that FEM discretisation is valid for the most general case, where the regulariser is anisotropic and non-metric. While our findings are generic and applicable to different vision problems, we demonstrate their practical implementation in the context of semantic 3D reconstruction, where such regularisers have proved particularly beneficial. The proposed FEM approach leads to a smaller memory footprint as well as faster computation, and it constitutes a very simple way to enable variable, adaptive resolution within the same model