Urban food waste for soil amendment? Analysis and characterisation of waste-based compost for soil fertility management in agroecological horticultural production systems in the city of Rosario, Argentina

Urban and peri-urban lands can be an important source of food production for localised and sustainable food systems, however, their soils can be of poor quality, degraded or damaged by anthropic activities, and little is known about their suitability or safety. This paper aims to contribute to this knowledge gap by assessing the soil remediation capacity and qualities of different types of compost made from urban and peri-urban organic wastes for agroecological food production. Prepared over the course of 2021, and used in 2022 for food growing, five different composts were observed and analysed, in two different farms in the city of Rosario, Argentina. Four raw materials generated largely by local industries were used to make the composts: chicken manure, rumen (cow’s stomachs), brewer’s bagasse (byproducts of the beer industry) and urban leaves collected from the municipality waste collection. These were mixed in different proportions (all reaching the 20–30 C/N ratio, typical of quality compost) to produce viable growing substrates where radishes and lettuces were grown. The aim of the study was to assess the possibility, quality and limitations to use locally available organic inputs for soil fertility management in agroecological farming, in the context of urbanisation and to assess pathways to develop closed-cycle agroecological agriculture at metropolitan level. Natural manure substrates (raw and composted) were analysed, as well as crops grown and fertilised with each of the substrates. The attributes and limiting factors of each substrate and their response to local soil conditions were compared and physicochemical, biochemical, and microbiological analyses were performed, including among others, the study of microbial biomass, biological activity, biophytotoxicity, pH, aerobic heterotrophs, nitrogen fixation, and the presence of antibiotics, agrochemicals and heavy metals. The results of the analyses show that all the composted materials improved the physical, chemical and biological properties. However, in some cases, pollutants were present even after composting. Analysis carried out on the vegetables generally indicate undetectable levels or levels below the admissible limits, demonstrating the filtering capacity of the different composts and the soil

Ethnographic understandings of ethnically diverse neighbourhoods to inform urban design practice

The aim of this paper is to inform urban design practice through deeper understanding and analysis of the social dynamics of public outdoor space in ethnically diverse neighbourhoods. We hypothesise that findings from ethnographic research can provide a resource that improves cultural literacy and supports social justice in professional practice. The primary method is a meta-synthesis literature review of 24 ethnographic research papers, all of which explore some dimensions of public open space use and values in UK urban contexts characterised by ethnic and racial diversity. We summarise thematic understandings and significance of neighbourhood places of shared activity, parks, spaces of passing-by and of retreat. We evaluate the implications for intercultural social dynamics, exploring the spatial and temporal dimensions of conviviality and racism in public open space. We then argue that it is possible to develop principles for urban design practice informed by this work, and propose four for discussion: maximising straightforward participation, legitimising diversity of activity, designing in micro-retreats of nearby quietness and addressing structural inequalities of open space provision. We conclude that ethnographic research can provide detailed insights into the use of the public realm and also inform a more nuanced understanding of outdoor sociality relevant for an increasingly diverse society. The challenge is two-fold: for ethnographers to become less cautious in engaging with decisions and priorities regarding how cities change, and for urban designers to explicitly embed informed understandings of difference into their broad desire for inclusive public space

Establishing urban gardens on vacant land while considering international good practices: a legal case study from Portugal

There is a gap in most countries’ legal frameworks regarding their ability to connect vacant land and urban gardens. Hence, research is needed to understand how regulation on vacant land might be designed to promote a more sustainable purpose to it. Urban gardens are a type of urban agriculture that could be potentiated by such regulation. The aim of this paper is to show how that can be done through the Municipal Master Plans (MMP) legal and regulatory framework for the Portuguese case, by reviewing worldwide good practices on vacant land restorations for urban sustainable development. The paper comprises a literature review on good practices adopted in different countries regarding vacant lot restoration. The evaluation of good practices is built on the achievement of the three pillars of sustainability. Five Portuguese MMP were used, as empirical data, to support the design of a new legal and regulatory framework. The goal is to enhance the sustainable destination of vacant land by converting it into urban gardens. The analysis of these MMPs demonstrated that they disregard urban gardens as a tool to promote urban sustainability in spite of global trends to make urban territorial planning and management instruments greener. An additional outcome of this paper is to categorise different types of vacant land in the five municipalities under analysis according to their suitability for urban garden conversion. The design of the legal framework enhancing the conversion of vacant land into urban garden will contribute to the 2030 international agenda goals’ achievement. The proposal would create an innovative legal framework in the case of Portugal that could be replicated by other countries.info:eu-repo/semantics/acceptedVersio

Double blind randomized placebo-controlled trial on the effects of testosterone supplementation in elderly men with moderate to low testosterone levels: design and baseline characteristics [ISRCTN23688581]

In ageing men testosterone levels decline, while cognitive function, muscle and bone mass, sexual hair growth, libido and sexual activity decline and the risk of cardiovascular diseases increase. We set up a double-blind, randomized placebo-controlled trial to investigate the effects of testosterone supplementation on functional mobility, quality of life, body composition, cognitive function, vascular function and risk factors, and bone mineral density in older hypogonadal men. We recruited 237 men with serum testosterone levels below 13.7 nmol/L and ages 60–80 years. They were randomized to either four capsules of 40 mg testosterone undecanoate (TU) or placebo daily for 26 weeks. Primary endpoints are functional mobility and quality of life. Secondary endpoints are body composition, cognitive function, aortic stiffness and cardiovascular risk factors and bone mineral density. Effects on prostate, liver and hematological parameters will be studied with respect to safety. Measure of effect will be the difference in change from baseline visit to final visit between TU and placebo. We will study whether the effect of TU differs across subgroups of baseline waist girth (< 100 cm vs. ≥ 100 cm; testosterone level (<12 versus ≥ 12 nmol/L), age (< median versus ≥ median), and level of outcome under study (< median versus ≥ median). At baseline, mean age, BMI and testosterone levels were 67 years, 27 kg/m(2 )and 10.72 nmol/L, respectively

Occurrence of infections in children infected with human immunodeficiency virus

To evaluate the occurrence of infections in asymptomatic and symptomatic human immunodeficiency virus (HIV)-infected children we performed a prospective comparative cohort study. Twenty-seven HIV-infected children were individually matched with paired immunocompetent controls and followed up for a total of 543 months (mean per child, 19.4 +/- 11 months). Collected data were evaluated considering HIV-infected children both as a whole and as P1 and P2 patients according to the Centers for Disease Control classification. Twenty-seven HIV-infected children had 185 infectious episodes vs. 27 matched controls who experienced 118 infections. P1 children had a number of infections similar to those of normal controls (99 vs. 86) whereas P2 children had a significantly higher number of infections than did controls (86 vs. 32). Pneumonia and oral candidiasis occurred significantly more frequently in symptomatic HIV-infected children than in normal controls. Severe infections occurred almost exclusively in HIV-infected symptomatic children

Anthropometric or ultrasonic measurements in assessment of visceral fat. A comparative study

The main aim of the study (study 1) was to compare the accuracy of anthropometric and ultrasonic measurements in assessing the amount of visceral adipose tissue. An additional aim (study 2) was to verify ultrasound technique precision. Study 1: using computed tomography (CT) L4-L5 adipose tissue area as a gold standard we compared the accuracy of waist/hip circumference ratio, sagittal diameter and ultrasonic measurements of intra-abdominal depth in assessing the amount of visceral adipose tissue. Study 2: ultrasonic measurements of the intra-abdominal muscle-vertebra distance were made in triplicate by three different operators. In study 1, 24 volunteers were used; body mass index (BMI): 19-43. In study 2, 22 volunteers were used; BMI 20-42. In study 1, ultrasonic measurements of the abdominal depth correlated best with CT visceral adipose tissue area (r = 0.89-0.91). In study 2, inter-operator and intra-operator mean variation coefficients were about 7% and 5% respectively. We concluded that using a well standardized technique and properly trained operators, ultrasonic measurement of intra-abdominal depth is a valid method in assessing the amount of visceral adipose tissue

Early diagnosis of HIV infection in infants.

Abstract Eighteen infants born to anti-HIV-positive mothers were tested bimonthly for immunoglobulin M (IgM) anti-HIV by Western blot and HIV p24 antigen (Ag) by enzyme-linked immunosorbent assay (ELISA) in order to determine the role of these markers in the early diagnosis of HIV infection. Twelve healthy infants were also studied as a control group. In 11 out of 18 children (61.1%) an IgM response was demonstrable, in 13 out of 18 (72.2%) IgM anti-HIV and/or p24 antigen (Ag) were detected. Two patterns of IgM response were identified: a precocious IgM positivity (group of five children positive at birth) and a later appearance of IgM, always within the third month (six cases). Early p24 antigenemia occurred in one infant. Three out of four children who developed antigenemia after birth were symptomatic within the sixth month. No clinical or immunological abnormalities were found among the three children who were persistently negative for both IgM anti-HIV and p24 Ag. Serial IgM anti-HIV and p24 Ag testing may be helpful in the early identification of HIV-infected patients