Residential Indoor Radon Assessment in the Vicinity of some Dumpsites in Lagos, Nigeria

Dumpsites in Nigeria are generally open and significantly elevate the pollution and contamination level of the total environment. Indoor radon was measured with CR-39 detectors in some buildings in the vicinity of dumpsites in Lagos, Nigeria. Eight (8) dumpsites (4 dormant and 4 active dumpsites) were chosen for this study. Detectors were exposed in 50 houses randomly selected within 0 and 100m away from the dumpsites. The detectors were exposed for 3 months. They were then retrieved and etched in a 6M NaOH solution in a water-bath at a temperature of 90oC for 3 hours. Tracks were counted using a semi-automatic system with a DCE camera mounted on a microscope and connected to a PC. Radon concentration ranged from 24.00\ub14.86 to 656.00\ub1131.20 Bqm-3 in the active dumpsites. Mean concentrations were 120.3\ub124.0, 257\ub151.4, 179.8\ub133.6, and 131.5\ub119.4, respectively in Oke-Odo, MRF, Olusosun, and Solus-3. In the dormant sites, concentration ranged from 16\ub13.2 to 931\ub1186.3 Bqm-3 having means of 194.17\ub138.80, 206.75\ub141.33, 223.25\ub144.69, and 334\ub166.85Bqm-3, respectively in Oke-Afa, Solus-1, Solus-2, and Solus-4. The annual effective dose and cancer risk in the active and dormant dumpsites were (3.60 mSv, 8.97 per million person-yearly) and (4.53 mSv, 12.47 per million person-yearly), respectively. This study revealed some high value of radon concentrations in some houses close to the dormant dumpsites than in the active dumpsites. This is unsafe and can cause severe health issues in the long term

Prospective Observational Study on acute Appendicitis Worldwide (POSAW)

Acute appendicitis (AA) is the most common surgical disease, and appendectomy is the treatment of choice in the majority of cases. A correct diagnosis is key for decreasing the negative appendectomy rate. The management can become difficult in case of complicated appendicitis. The aim of this study is to describe the worldwide clinical and diagnostic work-up and management of AA in surgical departments.info:eu-repo/semantics/publishedVersio

A seven-year review of emergency peripartum hysterectomy in a tertiary hospital in northern Nigeria

Background: Emergency peripartum hysterectomy (EPH) is surgical removal of the uterus during childbirth or within its immediate 24 hours, a lifesaving procedure done as the last resort to control obstetric haemorrhage. Objectives: To determine the incidence, indications, and complications of peripartum hysterectomy. Methods: The study is a retrospective review of emergency peripartum hysterectomies performed at the Centre from 1st January, 2015 to 31st December, 2021. The patients’ case folders were retrieved from the medical records department and relevant information obtained using a structured data extraction format. The data was analyzed using SPSS version 26. Means, frequency, and percentages were used to present the significance of the results. Results: A total of 46 EPH were performed between January 2015 and December 2021 out of 20,832 deliveries within the same period, giving an incidence of 0.22% (2.2 per thousand deliveries). Indications were uterine rupture (78.2%), uterine atony (10.9%), abruptio placentae (4.3%), placenta previa (4.3%) and placenta accreta spectrum (2.2%). Subtotal hysterectomy was performed in most cases (39/46; 84.8%). The most common complication was intraoperative haemorrhage requiring blood transfusion (100%). Other complications included severe post-operative anaemia, wound sepsis, paralytic ileus and enterocutaneous fistula. The maternal case fatality was 4 (8.7%) and all the mortality cases were unbooked patients. Conclusion: The incidence of emergency peripartum hysterectomy is relatively low in our study and uterine rupture is the most common indication. EPH is associated with significant maternal morbidity and mortality, and this is related to booking status. Hence, enlightening women on antenatal care and hospital delivery will help in reducing maternal morbidity and mortality

Some Maps and their Chaoticity

The work shows the determinant of the standard map and logistic map with their chaoticity. The equations of the maps were iterated at various different values for parameters k (stochascity for standard map) and r (stochascity for logistic map) at different values. It was noticed that the chaoticity of the standard depend on the parameter k and the initial values of X and in the equation. The logistic map iteration shown the result of the map is only dependent on the parameter r not on the initial values of X chosen for the equation.Keywords: Chaos, Standard map, Logistics map, StochascityJournal of the Nigerian Association of Mathematical Physics, Volume 20 (March, 2012), pp 199 – 20

Some Maps and their Chaoticity

The work shows the determinant of the standard map and logistic map with their chaoticity. The equations of the maps were iterated at various different values for parameters k (stochascity for standard map) and r (stochascity for logistic map) at different values. It was noticed that the chaoticity of the standard depend on the parameter k and the initial values of Χ and θ in the equation. The logistic map iteration shown the result of the map is only dependent on the parameter r not on the initial values of X chosen for the equation.Keywords: Chaos, Standard map, Logistics map, Stochascity

Mead fermentation monitoring by proton transfer reaction mass spectrometry and medium infrared probe

Mead is a traditional alcoholic beverage similar to wine, but obtained by the fermentation of a diluted solution of honey. The rate of fermentation is generally monitored by the measurement of a set of physicochemical variables such as pH, titratable acidity, Brix degrees, sugars and ethanol concentration. This work aims at developing a new monitoring method for alcoholic fermentations that is based on two on-line approaches: a proton transfer reaction mass spectrometry (PTR-MS) and a fibre optic coupled attenuated total reflection (FTIR-ATR) spectroscopy. Microfermentations are performed on 100 mL musts in isothermal conditions at 20 °C. Musts consist on diluted honey solutions (24 Bx) with pollen (0.4 % w/v) and yeast (Saccharomyces cerevisiae subsp. bayanus). The effect of flavour enhancers [chilli (Capsicum annuum), clove (Eugenia caryophyllata) and a mixture of both] on the rate of fermentation was also evaluated. The results show that clove inhibits fermentation, whereas chilli increases the rate of fermentation. PTR-MS and FTIR-ATR are simple, fast and nondestructive techniques able to monitor the fermentation process without the need of sample preparation, extraction or pre-concentration steps