GEOMORPHOLOGICAL MAPPING OF PART OF THE NIGER DELTA, NIGERIA USING DEM AND MULTISPECTRAL IMAGERY

This study utilised geo-information technology to carry out a geomorphological mapping of a part of the Niger Delta. Satellite image analysis was based on bi-annual seasonal approach using a combination of visual analysis of the geometry, site, situation, colour, and season for analysis of the non-topographic features. The study also utilised virtual and onsite fieldworks and existing geomorphologic information to interpret and analyse topographic and bathymetric features. First-order topographic features (elevation) and second level features including slope, aspect, curvature and mathematically exaggerated shaded relief were extracted from DEM. Relief classification was based on average elevation differences, hill shade, slope, and aspect. Three main non-topographic landforms were identified; the permanent rivers with stable meanders, perennially-active systems of creeks and fluvial landforms including scroll bars and oxbows. With the exception of higher elevation values towards the north-western fringe, the elevation ranges between mean sea level and 1 metre above sea level thus establishing a somewhat flat terrain. These areas were filled with meandering streams, sinuous creeks and watercourses flanked by mangrove vegetation.  In the north-western area, elevation rose close to approximately 4 metres in most of the area with a peak of 10 metres.  Generally, the cumulative area-slope analysis yielded a deltaic plain with generalised slope ≤ 20. Overall two elevation-based geographically differentiated morphological units were identified; tidal mudflats and saltmarshes. The study recommends that to provide needed information for resource planning and management, further investigation should be carried out with a view to modelling probable ecological and geomorphological changes in the entire Niger Delta.   &nbsp

Degradation of cyclohexane and cyclohexanone by Bacillus lentus strain LP32

A Gram-positive bacterium, Bacillus lentus LP32, originally isolated on the basis of its ability to utilise pyrene as sole source of carbon was found to be able to grow luxuriantly on alicyclic compounds as sole substrates. It showed poor growth on anthracene, naphthalene, 1-naphthol and phenanthrene. Growth rate on cyclohexane was 1.32 d-1, while doubling time was 0.76 d. The corresponding values for growth on cyclohexanone were 0.77 d-1 and 1.29 d, respectively. Within 10 days, the amount of cyclohexane in culture reduced from 317.62 to 102.55 mgl-1, then to 23.04 mgl-1 on day 18. On cyclohexanone, substrate concentration decreased from 287.56 mgl-1 to 101.66 mgl-1 in 10 days before declining to 24.21 mgl-1 on day 18. The rate of degradation when growing on cyclohexane was 23.50 mgl-1d-1 in the first 10 days and 9.93 mgl-1d-1 between day 10 and day 18, with 67.71% degradation in 10 days and overall percentage degradation of 92.43%. On cyclohexanone, the corresponding values were 18.59 and 9.68 mg l-1d-1 as well as 64.65 and 91.58%, respectively. This organism is a potential candidate for bioremediation purpose.Keywords: Degradation, cyclohexane, cyclohexanone, alicyclic compounds

Comparison of Sodium Thiopentone and Propofol for Electroconvusive Therapy(ECT)

Background: Seizure activity produced by Electroconvulsive Therapy(ECT) is considered as the therapeutic aspect of this form of treatment, but is accompanied by untoward physiologic consequences, mainly cardiovascular neurological in  nature. The hemodynamic effects can have a significant impact in patients with underlying cardiovascular disease. A number of medications have been used during ECT including pretreatment sedation, anaesthetic agents, muscle relaxants, anticholinergics, and drugs to attenuate parasympathetic and sympathetic responses.  AIMS  AND OBJECTIVES:  This study was carried out to compare propofol and sodium thiopentonne effectswhen used for modified electroconvulsive therapy . METHODOLOGY:  After ethical approval forty patients being planned for modified electroconvulsive therapy were recruited.They were randomly allocated into sodium  thiopentone and propofol groups .The two groups  had propofol 2mg/kg or  sodium thiopentone 5mg/kg respectively and then suxamethonium 1mg/kg. After fasciculation a brief pulse impulse was deliveredby psychiatrist while patient is being ventilated manually with 100% Oxygen.The duration ofseizure,, the time to loss of conscioussness, incidence of complications were recorded.  RESULTS:  This single blinded study was carried out on 40 adult patients equally divided into two groups of 20 each to compare the haemodynamic effects and seizure activity of thiopentone sodium (GroupS) and propofol(Group P) when used as inducing agents in patients undergoing modified electroconvulsive therapy (MECT). Results showed propofol maintained significantly better haemodynamics compared to thiopentone and seizure time was significantly lower with propofol compared to thiopentone . Recovery from anaesthesia post MECT was significantly quicker with propofol compared with thiopentone. Hence,we conclude that  propofol has advantage over thiopentone when used as an induction agent for modified electroconvulsive theraphy. Keywords: Protocol, Sodium thiopentone, Electroconvulsive therapy. DOI: 10.7176/JBAH/11-16-02 Publication date:August 31st 202

Cohort Differences in Cognitive Impairment and Cognitive Decline Among Mexican-Americans Aged 75 Years or Older

Research suggests that the prevalence and incidence of cognitive impairment among older adults is decreasing. This analysis used data from 9 waves (1993–2016) of the Hispanic Established Populations for the Epidemiologic Study of the Elderly to assess cognitive status and cognitive decline for 2 cohorts of Mexican-Americans aged ≥75 years in 1993–1994 versus 2004–2005. Logistic regression, joint longitudinal survival models, and illness-death models for interval-censored data were used to examine cohort differences in the odds of prevalent cognitive impairment, trajectories of cognitive decline, and the risk of 10-year incident cognitive impairment, respectively. Results indicated that compared with the 1993–1994 cohort, the 2004–2005 cohort had higher odds for prevalent cognitive impairment (odds ratio = 2.51, 95% confidence interval (CI): 1.92, 3.29), particularly among participants with \u3c4 years of education (odds ratio = 2.99, 95% CI: 2.14, 4.18). Conversely, the 2004–2005 cohort exhibited significantly slower rates of cognitive decline (βˆ = 0.50, 95% CI: 0.39, 0.62) and had a significantly lower risk of incident cognitive impairment (hazard ratio = 0.75, 95% CI: 0.62, 0.91) compared with the 1993–1994 cohort. This analysis provides mixed results for cohort trends in the cognitive health of older Mexican-Americans. Continued research is needed to identify risk factors that contribute to these population-level trends

Cohort Differences in Cognitive Impairment and Cognitive Decline Among Mexican-Americans Aged 75 Years or Older

Research suggests that the prevalence and incidence of cognitive impairment among older adults is decreasing. This analysis used data from 9 waves (1993–2016) of the Hispanic Established Populations for the Epidemiologic Study of the Elderly to assess cognitive status and cognitive decline for 2 cohorts of Mexican-Americans aged ≥75 years in 1993–1994 versus 2004–2005. Logistic regression, joint longitudinal survival models, and illness-death models for interval-censored data were used to examine cohort differences in the odds of prevalent cognitive impairment, trajectories of cognitive decline, and the risk of 10-year incident cognitive impairment, respectively. Results indicated that compared with the 1993–1994 cohort, the 2004–2005 cohort had higher odds for prevalent cognitive impairment (odds ratio = 2.51, 95% confidence interval (CI): 1.92, 3.29), particularly among participants with \u3c4 years of education (odds ratio = 2.99, 95% CI: 2.14, 4.18). Conversely, the 2004–2005 cohort exhibited significantly slower rates of cognitive decline (βˆ = 0.50, 95% CI: 0.39, 0.62) and had a significantly lower risk of incident cognitive impairment (hazard ratio = 0.75, 95% CI: 0.62, 0.91) compared with the 1993–1994 cohort. This analysis provides mixed results for cohort trends in the cognitive health of older Mexican-Americans. Continued research is needed to identify risk factors that contribute to these population-level trends

Lower Risk of 10-Year Incident Cognitive Impairment for Mexican Americans Aged 75 and Older in 2004-05 Compared to 1993-94

There is growing evidence for a decline in the prevalence and incidence of Alzheimer’s disease and related dementias. These findings have been attributed to greater educational attainment, reduced incidenced of stroke, and better management of chronic health conditions. However, limited research has examined if the declining trend in dementia risk are also occurring in minority populations, especially Mexican Americans. Methods: Data: This analysis used data from the Hispanic Established Populations for the Epidemiologic Study of the Elderly (H-EPESE) to examine differences in the 10-year risk of cognitive impairment for Mexican Americans aged 75 and older in 2004-05 compared to Mexican Americans aged 75 and older in 1993-9

Residents’ perception of solid waste disposal practices in Sokoto, Northwest Nigeria

Proper waste disposal is a key to protecting public health. Thus poorly managed and disposed waste encourages breeding of insect vectors and exposed public to increase risk of infection. This study aimed at determining the residents’ perception about waste disposal in Sokoto metropolis. This was a descriptive cross-sectional survey conducted in Sokoto metropolis. A two stage sampling technique was used to select the survey participants. A set of interviewer-administered questionnaires were used to collect field data. Ethical clearance was obtained from state research ethics committee and in addition, individual informed consent was obtained before questionnaires were administered. Average age of the respondents was 30 years with 50% aged between 25 and 44 years. Large proportion (47.4%) of the respondents had only Quranic education. Majority (94.1%) of the respondents expressed worries about the indiscriminate littering of the metropolis with waste and more than half (55%) reported that residents were responsible for the state of poor sanitation while 38% felt it was fault of government. Although, 91% of respondents said it is appropriate for residents to clean own surroundings, 41% felt residents alone should take sole responsibility for the cleaning; while 40% felt government and residents should take joint responsibility. Less than half (46%) of respondents reported that improper waste disposal have health related problems. Although, majority respondents were disturbed with the way refuse litters the state metropolis, many are unaware of its health related problems. There is need to create awareness among general public of consequences of poor refuse disposal.Key words: Perception, solid waste, disposal, Sokoto

A Comprehensive Analysis of Morbidity Life Expectancies Among Older Hispanic Subgroups in the United States: Variation by Nativity and Country of Origin

Background and Objectives: Although a clear advantage in mortality has been documented among older Hispanic subgroups, particularly the foreign-born, research examining health selectivity in morbidity life expectancies among older Hispanics are scarce. Differences in sociocultural characteristics among Hispanic subgroups may influence racial/ethnic and nativity disparities in morbidity. Research examining the heterogeneity among older Hispanic subgroups may further our understanding of why some Hispanics are able to preserve good health in old age, while others experience a health disadvantage. Thus, the primary goal of this analysis is to examine racial/ethnic, nativity, and country of origin differences in morbidity life expectancies among older adults in the United States. Research Design and Methods: We used individual-level data (1999–2015) from the National Health Interview Survey to estimate Sullivan-based life tables of life expectancies with morbidity and without morbidity by gender for U.S.-born Mexicans, foreign-born Mexicans, U.S.-born Puerto Ricans, island-born Puerto Ricans, foreign-born Cubans, and whites in mid-life (age 50), and late-life (age 65). Results: Hispanics are heterogeneous in morbidity life expectancies. Among females, U.S.-born Mexicans, foreign-born Mexicans, and island-born Puerto Ricans spent more late-life years with morbidity than whites. For men, U.S.-born Puerto Ricans were the only Hispanic subgroup disadvantaged in the number of years lived with morbidity. Conversely, foreignborn Cubans exhibited the healthiest outcomes of all groups, regardless of gender. Discussion and Implications: Reducing the risk for late-life morbidity must be informed by a comprehensive understanding of a wide range of factors that shape health among older adults. Research should avoid pan-ethnic groupings that overlook important differences in chronic disease risk profiles among Hispanic subgroups. Recognizing the various sociocultural and environmental processes that underlie Hispanic subpopulations is important for development and implementation of social and public health policies aimed at ameliorating negative health outcomes of late-life morbidity among minority and immigrant groups

Erratum: A Comprehensive Analysis of Morbidity Life Expectancies Among Older Hispanic Subgroups in the United States: Variation by Nativity and Country of Origin (Table 3 & Figure 2)

Background and Objectives: Although a clear advantage in mortality has been documented among older Hispanic subgroups, particularly the foreign-born, research examining health selectivity in morbidity life expectancies among older Hispanics are scarce. Differences in sociocultural characteristics among Hispanic subgroups may influence racial/ethnic and nativity disparities in morbidity. Research examining the heterogeneity among older Hispanic subgroups may further our understanding of why some Hispanics are able to preserve good health in old age, while others experience a health disadvantage. Thus, the primary goal of this analysis is to examine racial/ethnic, nativity, and country of origin differences in morbidity life expectancies among older adults in the United States. Research Design and Methods: We used individual-level data (1999–2015) from the National Health Interview Survey to estimate Sullivan-based life tables of life expectancies with morbidity and without morbidity by gender for U.S.-born Mexicans, foreign-born Mexicans, U.S.-born Puerto Ricans, island-born Puerto Ricans, foreign-born Cubans, and whites in mid-life (age 50), and late-life (age 65). Results: Hispanics are heterogeneous in morbidity life expectancies. Among females, U.S.-born Mexicans, foreign-born Mexicans, and island-born Puerto Ricans spent more late-life years with morbidity than whites. For men, U.S.-born Puerto Ricans were the only Hispanic subgroup disadvantaged in the number of years lived with morbidity. Conversely, foreignborn Cubans exhibited the healthiest outcomes of all groups, regardless of gender. Discussion and Implications: Reducing the risk for late-life morbidity must be informed by a comprehensive understanding of a wide range of factors that shape health among older adults. Research should avoid pan-ethnic groupings that overlook important differences in chronic disease risk profiles among Hispanic subgroups. Recognizing the various sociocultural and environmental processes that underlie Hispanic subpopulations is important for development and implementation of social and public health policies aimed at ameliorating negative health outcomes of late-life morbidity among minority and immigrant groups