title: Quality of cellulose and biostimulant extracts from Oedogonium calcareum cultivated during primary wastewater treatment

authors: Jayasooriya, Nethmie

subjects: Biomass utilization

abstract: A practical two-product cascading biorefinery was developed to extract a biostimulant and cellulose from the freshwater filamentous macroalga Oedogonium calcareum grown while treating primary wastewater. Biostimulant production provides a valuable extract with production of disinfected residual biomass for further product development. Both Escherichia coli and F-specific RNA bacteriophage, indicators of human pathogens contamination, were absent from the residual biomass. The chemical composition of the biostimulant was complex, consisting of growth-promoting substances, free amino acids, and minerals. The O. calcareum cellulose fractions yielded between 9.5% and 10.1% (w/w) with purities from 84% to 90% and closely resembled microcrystalline cellulose. Biostimulant extraction improved cellulose quality by increasing crystallinity from 59% to 62%. Biomass condition, drying process, and biostimulant production influenced the crystallinity index. This study demonstrates a two-step process of biostimulant and cellulose extraction from wastewater-grown Oedogonium, simultaneously disinfecting biomass and isolating high-quality cellulose as a sustainable alternative to conventional extraction methods.

text: Quality of cellulose and biostimulant extracts from Oedogonium calcareum cultivated during primary wastewater treatment A practical two-product cascading biorefinery was developed to extract a biostimulant and cellulose from the freshwater filamentous macroalga Oedogonium calcareum grown while treating primary wastewater. Biostimulant production provides a valuable extract with production of disinfected residual biomass for further product development. Both Escherichia coli and F-specific RNA bacteriophage, indicators of human pathogens contamination, were absent from the residual biomass. The chemical composition of the biostimulant was complex, consisting of growth-promoting substances, free amino acids, and minerals. The O. calcareum cellulose fractions yielded between 9.5% and 10.1% (w/w) with purities from 84% to 90% and closely resembled microcrystalline cellulose. Biostimulant extraction improved cellulose quality by increasing crystallinity from 59% to 62%. Biomass condition, drying process, and biostimulant production influenced the crystallinity index. This study demonstrates a two-step process of biostimulant and cellulose extraction from wastewater-grown Oedogonium, simultaneously disinfecting biomass and isolating high-quality cellulose as a sustainable alternative to conventional extraction methods.

year: 2024-07-01

title: Optical measurement of blade edge sharpness

authors: Dredge, Daniel

subjects: Knife

abstract: This research aims to develop a superior way of characterizing knife sharpness. Current successful methods utilize contact destructive testing to develop a measurement protocol for sharpness however; it is in my opinion that testing in this manner, the instantaneous sharpness can never be known. Through-out this work, I investigate what physical properties determine sharpness, how failures occur in knives, the current state of art in knife sharpness testing, and then I seek to develop a new novel way of measuring knife sharpness through optical measurements.

text: Optical measurement of blade edge sharpness This research aims to develop a superior way of characterizing knife sharpness. Current successful methods utilize contact destructive testing to develop a measurement protocol for sharpness however; it is in my opinion that testing in this manner, the instantaneous sharpness can never be known. Through-out this work, I investigate what physical properties determine sharpness, how failures occur in knives, the current state of art in knife sharpness testing, and then I seek to develop a new novel way of measuring knife sharpness through optical measurements.

year: 2018

title: Wrestling with Biculturalism in Social Work Education

authors: Glubb-Smith, Kelly J.

subjects: Bicultural social work

abstract: When approached to write a piece on Donna Awatere’s (1984) book Māori Sovereignty from a social work perspective we seized the opportunity to reconsider her work. Revisiting the text after a 30-year-plus hiatus sparked a series of reflective conversations about how we wrestle with teaching biculturalism and our efficacy in preparing students for bicultural practice realities. This article draws upon our co-constructed narratives about what it means to be a social work educator in a bicultural practice landscape. Social work students graduate into an exceedingly complex practice environment fraught with tension about how to resolve inequities across the micro-to-macro continuum. The focus of this article is how Donna Awatere’s work is reflected in the tensions and responsibilities experienced when socialising students into the bicultural mission of social work practice in Aotearoa (New Zealand).

text: Wrestling with Biculturalism in Social Work Education When approached to write a piece on Donna Awatere’s (1984) book Māori Sovereignty from a social work perspective we seized the opportunity to reconsider her work. Revisiting the text after a 30-year-plus hiatus sparked a series of reflective conversations about how we wrestle with teaching biculturalism and our efficacy in preparing students for bicultural practice realities. This article draws upon our co-constructed narratives about what it means to be a social work educator in a bicultural practice landscape. Social work students graduate into an exceedingly complex practice environment fraught with tension about how to resolve inequities across the micro-to-macro continuum. The focus of this article is how Donna Awatere’s work is reflected in the tensions and responsibilities experienced when socialising students into the bicultural mission of social work practice in Aotearoa (New Zealand).

year: 2023-07-27