Toward a Comprehensive Approach to the Collection and Analysis of Pica Substances, with Emphasis on Geophagic Materials

Pica, the craving and subsequent consumption of non-food substances such as earth, charcoal, and raw starch, has been an enigma for more than 2000 years. Currently, there are little available data for testing major hypotheses about pica because of methodological limitations and lack of attention to the problem.In this paper we critically review procedures and guidelines for interviews and sample collection that are appropriate for a wide variety of pica substances. In addition, we outline methodologies for the physical, mineralogical, and chemical characterization of these substances, with particular focus on geophagic soils and clays. Many of these methods are standard procedures in anthropological, soil, or nutritional sciences, but have rarely or never been applied to the study of pica.Physical properties of geophagic materials including color, particle size distribution, consistency and dispersion/flocculation (coagulation) should be assessed by appropriate methods. Quantitative mineralogical analyses by X-ray diffraction should be made on bulk material as well as on separated clay fractions, and the various clay minerals should be characterized by a variety of supplementary tests. Concentrations of minerals should be determined using X-ray fluorescence for non-food substances and inductively coupled plasma-atomic emission spectroscopy for food-like substances. pH, salt content, cation exchange capacity, organic carbon content and labile forms of iron oxide should also be determined. Finally, analyses relating to biological interactions are recommended, including determination of the bioavailability of nutrients and other bioactive components from pica substances, as well as their detoxification capacities and parasitological profiles.This is the first review of appropriate methodologies for the study of human pica. The comprehensive and multi-disciplinary approach to the collection and analysis of pica substances detailed here is a necessary preliminary step to understanding the nutritional enigma of non-food consumption

Search for gravitational waves associated with gamma-ray bursts detected by Fermi and Swift during the LIGO–Virgo run O3b

We search for gravitational-wave signals associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the second half of the third observing run of Advanced LIGO and Advanced Virgo (2019 November 1 15:00 UTC–2020 March 27 17:00 UTC). We conduct two independent searches: a generic gravitational-wave transients search to analyze 86 GRBs and an analysis to target binary mergers with at least one neutron star as short GRB progenitors for 17 events. We find no significant evidence for gravitational-wave signals associated with any of these GRBs. A weighted binomial test of the combined results finds no evidence for subthreshold gravitational-wave signals associated with this GRB ensemble either. We use several source types and signal morphologies during the searches, resulting in lower bounds on the estimated distance to each GRB. Finally, we constrain the population of low-luminosity short GRBs using results from the first to the third observing runs of Advanced LIGO and Advanced Virgo. The resulting population is in accordance with the local binary neutron star merger rate

Remark: The three kinds of paradoxes are equivalent. They are called: The Smarandache

E11: All is possible, the impossible too. E12: All are present, the absents too. E13: All is finite, the infinite too. Paradox 2. ALL IS <Non-A>, THE <A> TOO. Examples: E21: All is impossible, the possible too. E22: All are absent, the presents too. E23: All is infinite, the finite too. Paradox 3. NOTHING IS <A>, NOT EVEN <A>. Examples: E31: Nothing is perfect, not even the perfect. E32: Nothing is absolute, not even the absolute. E33: Nothing is finite, not even the finite

Parameters of a National Biography

This article is concerned with the ontology of political community, specifically the nation-state, as a bounded entity in time and space. Juxtaposed against the reading of it as an autonomous (realism) or permeated (liberalism) unit, or as constituted through Othering (social constructivism), the article conceptualizes the nation-state as a bounded community constituted by a biographical narrative which gives meaning to its collective spatio-temporal situatedness. Taking a phenomenological approach, the article offers a systematic discussion of the parameters of such a narrative. It highlights the relevance of an experienced space, giving meaning to the past, and an envisioned space, giving meaning to the future, delineated through horizons of experience and of possibility, respectively. In this reading, politics is found in the creative and contested attempts to link these dimensions to a coherent narrative on both the domestic and international level