Closure of peritoneum at laparotomy - A survey of gynaecological practice

Background. The traditional practice of gynaecological surgeons has been to close the peritoneal surfaces at laparotomy. Experimental and clinical trials have shown no advantage associated with closure of peritoneum. The objective of this study was to detennine the attitude and practice of gynaecologists regarding peritoneal closure at laparotomy.Methods. Questionnaires were faxed to, or telephonic - interviews conducted with, 145 registered gynaecologists in Gauteng concerning their practices of peritoneal closure or non-closure at laparotomy. One hundred and one respondents replied and all data were entered onto a database (Epi-Info 6) for analysis.Results. The response rate was 70% (101/145). Peritoneal closure was performed more frequently by private obstetricians and gynaecologists than by those who workeither' part-time or full-time in government institutions. Significantly more  respondents in private practice than those who practise in government institutions close parietal peritoneum during caesarean section (92% v. 58%). The sametrend was noted for abdominal hysterectomy (92% v. 61%, respectively). Restoration of anatomy (39% in private practice v. 27% in government institutions) and prevention of adhesion formation (36% in private v. 30% in government service) are the hvo most important reasons given'by both groups for closure of peritoneal surfaces.Conclusion. The majority of specialists close peritoneal surfaces during the various surgical procedures in obstetrics and gynaecology, despite evidence that this practice does not improve surgical outcome

Acidic leaching of iron from Kaoje Goethite ore by hydrochloric acid: Kinetics modelling

Considering the recent focus of the Nigeria Government to grow and develop the nation’s economy through the solid minerals sector reform, this study has been devoted to the kinetics of a Nigerian goethite ore by hydrochloric acid leaching for improved iron and steel industries applications. This study was performed in three different phases. In the first phase, acidic leaching of iron from a goethite ore was examined and the influence of the operating variables including: HCl concentration, leaching temperature, stirring speed and particle sizes was examined experimentally. The optimum condition was found to be HCl concentration of 1.81M, temperature of 80°C, 200 rpm stirring speed and particle size 0.09 μm for iron in the range of investigated parameters. Under those conditions, the highest iron recovery was obtained to be 95.67 %. In the second phase, the dissolution kinetics of iron was evaluated by the shrinking core models. The finding reveals that diffusion through the fluid was the leaching kinetics rate controlling step of the iron. The activation energy (Ea) was found to be 14.54 kJmol-1 for iron. Equation representing the leaching kinetic of iron was achieved to be 1−2/3α - (1 − x)2/3 = 0.7272 × e−38.29/8.314×T × t. The final stage of the experiment was carried out by characterizing the leached residues by X-ray diffractometer (XRD) and scanning electron microscopy (SEM), the result showed majorly the presence of rutile (TiO2), anglesite (PbSO4), and traces of iron-silicate face like pyrite (FeS), quartz (SiO2). Keywords: kinetics modelling, leaching, low-grade, recovery, shrinking cor

Assessment of Post Fire Structural Strengths of Normal Strength Concrete Subjected to Cyclic Thermal Loadings

Concrete is a composite construction material consisting basically of a binder, aggregates, water and with or without admixture to modify either or both its physical and chemical properties. The rate at which concrete structures especially buildings are gutted by fire hazards is on the increase and this has adverse effect on the strength, hence, the need to  assess the post fire structural strengths of Normal Strength Concrete(NSC). NSC of grade 50 was produced and cast into specimens of sizes 150mm cubes and 100mm x 100mm x 500mm reinforced concrete beams. The concrete cubes and beams were subjected to elevated cyclic thermal loadings after 7, 14 and 28 days of curing, while the rate of heating was maintained at 1oC/min until the target temperature of (100, 130, 160, 200 and 250)o C where attained and this was maintained for one hour and then allowed to cool at 1oC/min to room temperature of 32oC.         Unstressed Residual Uniaxial Compressive Test (URUCT and Flexural Strength Test (FST) were conducted on the cubes and reinforced concrete beams, respectively. Direct Tensile Strength Test (DTST) was performed on the high yield (460N/mm2) steel reinforcement. The result showed that the residual compressive strengths of concrete cubes decreases with increase thermal loadings. The expected strengths of 0.69 and 0.97 of the 28 days strength for 7 and 14 days respectively were met. The flexural strengths decrease with increase in thermal loadings. The flexural strength of the concrete beams at 28 days of 15.25N/mm2 at thermal loading of 32oC was reduced to 8.16/mm2 at thermal loading of 160oC; while the strength at 14 days of 12.19 N/mm2 at thermal loading of 32oC was reduced to 7.62N/mm2 at thermal loading of 160oC and finally, the strength at 7 days of 10.13N/mm2 at thermal loading of 32oC was reduced to 5.82N/mm2 at thermal loading of 160oC. All the results met the specification for high yield steel of 12% elongation at fracture. It was concluded that within the thermal loading range adopted, the tensile strength of the reinforcement was not impaired beyond the limit specified by the code. Keyword: Normal Strength Concrete, Thermal loadings, Unstressed Residual  Strength Test, Fire hazard

Assessment of Extension Officers Contribution to Cocoa Production in Nigeria

This study was carried out to evaluate the extension officer contribution to cocoa production in Nigeria. Multistage sampling technique was used, where two hundred and sixteen questionnaires were distributed in Osun and Ondo state , the information gathered were analyzed using descriptive statistic such as; frequency and percentage, while chi-square analysis was used to analyze the data obtained. From the results, married (77.6%),  male (84.0%), secondary school holders (52.0%), between 40-49 (34.4%) years old farmers were seen as the highest cocoa producers. Extension training(64.0%), commercial agents(64.0%), fellowship(52.8%), self observation(76.0%) were the best source of information on extension service of cocoa farming , most respondents (65.0%); get extension training programme at regular basis, identified Constraints facing cocoa production in the study area includes deficient credit facilities, high cost of labour, bad road, poor marketing/storage facilities, lack of technical knowledge / assess to technical tools and so on. in view of afore mentioned result it is therefore recommended that the government should make loan available to the cocoa famers at very low interest rate and urge cocoa farmers to form cooperative society, strengthen their agricultural extension agents so that they will be able to rain cocoa farmers on the basic things they should know about primary processing such as fermentation and drying of cocoa beans in improving the quality in Nigeria to meet international market. Keywords: Assessment, Extension officer, Contribution, Farmers, Cocoa productio