Barriers to utilization of cervical cancer screening services among non-medical female personnel in tertiary hospitals in south west Nigeria.

Context: Cervical cancer is the second most common cancer among women and contributes significantly to cancer related deaths among women worldwide. Women knowledge and practice of screening for pre malignant lesions vary significantly. Studies on this subject had focused mostly on either medically informed health care workers or lay community persons but hardly on non-medically informed hospital workers who forms the bulk of health workers and influences health behaviors equally or even more.Objectives: To assess women's knowledge, attitude and practices towards cervical cancer screening and the barriers to utilizing cervical cancer screening services among non-medical female personnel in two tertiary centers in South West NigeriaStudy Design. Setting and Subjects: The study is a deseriptive cross-sectional study among female nonmedical personnel in OOUTH Sagamu and LAUTECH Ogbomosho in southwestern Nigeria. A self administered questionnaire was used to collect data from 280 women, which was analyzed using SPSS 21 statistical software.Main Outcome Measures: The study measured knowledge, practices and barriers to utilization of screening services.Results: Awareness is 84.3% and knowledge of screening is 77.5%. Utilization rate is low at 15%; indecision, 32 .4% feeling of good health, 28.2% and fear of positive results, 18.1 % are the main reasons for not screening. Low level of education and poor knowledge orthe disease are discovered as the most significant barriers and determinants of utilization Conclusion and Recommendation: Women education in context specific terms is recommended as the intervention to improve screening practices amongst women of reproductive age group

Nitrogen removal performance and bacterial community analysis of a multistage step-feeding tidal flow constructed wetland

A multistage mesocosm vertical flow constructed wetland system was designed to treat synthetic domestic wastewater with a high nitrogen (N) load. The study aim was to determine the impact of design and operational variables on N removal efficiency in such systems. A tidal flow operational strategy enhanced aeration and was coupled with a step-feeding approach to promote N removal. Over the 420-day running period N removal rates were between 70 and 77 gN/m3/d, for a step-feeding ratio range of 60:40 to 80:20. The system was able to remove 91–95% of chemical oxygen demand, 74–91% of ammonium and 66–81% of total-N. Tidal flow and step-feeding strategies significantly impacted nitrogen removal with the best performance at a step-feeding ratio of 80:20 providing a carbon to nitrogen (COD/N) ratio of 4–5. The bacterial diversity increased at each stage throughout the system with dominating phyla Proteobacteria, Firmicutes, Planctomycetes, Bacteroidetes, Chloroflexi, Verrucomicrobia and Acidobacteria. Dominant bacteria at the genus level were Thiothrix, Planctomyces, Azonexus, Pseudoxanthomonas, Hydrogenophaga, Gemmobacter and other genera suggesting that N removal was accomplished via diverse metabolic pathways, including autotrophic nitrification, heterotrophic denitrification, autotrophic denitrification, and possibly anammox. This study shows benefits of step-feeding strategies in tidal flow constructed wetlands as a cost-effective solution for minimizing external carbon input to achieve effective N removal

Impact of flow hydrodynamics and pipe material properties on biofilm development within drinking water systems

The aim of this study was to investigate the combined impact of flow hydrodynamics and pipe material on biofilm development in drinking water distribution systems (DWDS). Biofilms were formed on four commonly used pipe materials (namely polyvinyl chloride, polypropylene, structured wall high-density polyethylene and solid wall high-density polyethylene) within a series of purpose built flow cell reactors at two different flow regimes. Results indicate that varying amounts of microbial material with different morphologies were present depending on the pipe material and conditioning. The amount of microbial biomass was typically greater for the biofilms conditioned at lower flows. Whereas, biofilm development was inhibited at higher flows indicating shear forces imposed by flow conditions were above the critical levels for biofilm attachment. Alphaproteobacteria was the predominant bacterial group within the biofilms incubated at low flow and represented 48% of evaluated phylotypes; whilst at higher flows, Betaproteobacteria (45%) and Gammaproteobacteria (33%) were the dominant groups. The opportunistic pathogens, Sphingomonas and Pseudomonas were found to be particularly abundant in biofilms incubated at lower flows, and only found within biofilms incubated at higher flows on the rougher materials assessed. This suggests that these bacteria have limited ability to propagate within biofilms under high shear conditions without sufficient protection (roughness). These findings expand on knowledge relating to the impact of surface roughness and flow hydrodynamics on biofilm development within DWDS

Effluents characteristics of selected industries in western Nigeria and implications for re-use in agricultural production

Wastewater characteristics provide basic information for their possible reuse for agricultural production as irrigation water and for fish culture. Pre-treated wastewater effluents from five industrial establishments were investigated to determine their potential of being used for irrigation and aquaculture. The physico – chemical analysis of the effluents indicates that most conform to recommended FAO (1992) and FEPA (1991) indicating potentials of being utilized for agricultural purpose. Exception occur in the total dissolved solids (TDS) and Nitrate (NO3-) contents which is found to be very high in most of the effluents sampled. pH analysis shows that effluent from food and beverage industries tend to be very acidic. The data so obtained in this study shows that the utilization of the pre-treated effluent from these industries for agricultural purpose could be encouraged with minor modification by further treatmen

Microbial community structure of anode electrodes in microbial fuel cells and microbial electrolysis cells

This study investigated the microbial community structure on the anode surface of four dual chamber bio-electrochemical systems. These systems were Microbial Fuel Cell (MFC) and Microbial Electrolysis Cell (MEC). The systems were inoculated with activated sludge and operated for electricity generation/hydrogen (H2) production, and phosphorus (P) recovery. The MFC achieved a maximum power output of 185 mW/m2 (1.62 kW h/m2), whilst the MEC achieved a maximum H2 production rate of 0.28 m3-H2/m3-d. Results from Illumina high-throughput sequencing of 16S rRNA genes showed that the microbial community structure of the MFCs was more diverse than that of the MECs, and this variation may be attributed to the differences in the operational conditions of the MFC and the MEC. MFC and MEC shared the same dominant bacterial phyla; Bacteroidetes, Proteobacteria and Firmicutes, with the most abundant bacterial genus in both systems belonging to Desulfovibrio. However, the abundance of Desulfovibrio in the MECs (13.2 ± 0.7 %) was greater than that in the MFCs (4.25 ± 0.2 %)

Constructed wetlands using aluminium-based drinking water treatment sludge as P-removing substrate : should aluminium release be a concern?

This study investigated an important issue of aluminium (Al) release in a novel reuse of Al-based water treatment sludge (Al-WTS) in constructed wetland system (CWs) as alternative substrate for wastewater treatment. Al-WTS is an inevitable by-product of drinking water treatment plants that use Al-salt as coagulant for raw water purification. It has recently been demonstrated that Al-WTS can be reused as a low-cost phosphorus (P) adsorbent and biofilm carrier in CWs for wastewater treatment. However, to facilitate the large scale application of Al-WTS in CWs as wetland substrate, concerns about Al leaching during its’ reuse in CWs must be addressed as Al is a dominant constituent in Al-WTS. In this study, a desk review of literature on Al release during Al-WTS reuse was conducted. Furthermore, a 42-week Al monitoring was carried out on a pilot field-scale CWs employing Al-WTS as main substrate. Results show that 22 out of the 35 studies reviewed, reported Al release with levels of soluble Al reported ranging from 0.01 to about 20 mg L-1. Monitoring of Al in the pilot field-scale CWs shows that there was Al leaching. However, except for the first three weeks of operation, effluents concentrations of both total- and soluble-Al were all below the general regulatory guideline limit of 0.2 mg L-1. Overall, the study addresses a very vital concern regarding the successful application of Al-WTS in CWs and shows that Al release during such novel reuse is quite low and should not preclude its use.Other funderDepartment of Agriculture, Fisheries and Food12M embargo: release after 1/06/2012 - AV 25/8/201

Carbon nanotube-reinforced polymer nanocomposites for sustainable biomedical applications: A review

The search for viable alternatives to conventional materials in biomedical applications is as important as the movement for the adoption of a sustainability approach in the production of polymer nanocomposites for prosthetic purposes. Carbon nanotube (CNT) reinforced polymer nanocomposites have become the center of the present prosthetic industry due to their unparalleled strength-to-weight characteristics. However, the categories of polymers used for this purpose and their long-term impact on the environment have generated controversies among researchers. The adequacy, affordability, and sustainability of materials for the development of prosthetics are some of the common concerns. Consequently, this review addresses concerns about the adherence to SDGs in biomedical manufacturing which focuses on material selection considering environmental impacts. In addition, contributions from previous research were reviewed based on the remarkable increase in the number of publications on CNT-reinforced polymer nanocomposites over the last 10 years. Various findings by researchers in the field who used natural rubber and other polymers as host matrices were analyzed from the perspective of sustainability. While considerable progress has been made in the use of other polymers in the biomedical field, only a few publications have targeted natural rubber. This review provides insights into opportunities for sustainable production and consumption of devices with biodegradable CNT/natural rubber nanocomposites