Proximate controls on semiarid soil greenhouse gas fluxes across 3 million years of soil development

Soils are important sources and sinks of three greenhouse gases (GHGs): carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). However, it is unknown whether semiarid landscapes are important contributors to global fluxes of these gases, partly because our mechanistic understanding of soil GHG fluxes is largely derived from more humid ecosystems. We designed this study with the objective of identifying the important soil physical and biogeochemical controls on soil GHG fluxes in semiarid soils by observing seasonal changes in soil GHG fluxes across a three million year substrate age gradient in northern Arizona. We also manipulated soil nitrogen (N) and phosphorus availability with 7 years of fertilization and used regression tree analysis to identify drivers of unfertilized and fertilized soil GHG fluxes. Similar to humid ecosystems, soil N2O flux was correlated with changes in N and water availability and soil CO2 efflux was correlated with changes in water availability and temperature. Soil CH4 uptake was greatest in relatively colder and wetter soils. While fertilization had few direct effects on soil CH4 flux, soil nitrate was an important predictor of soil CH4 uptake in unfertilized soils and soil ammonium was an important predictor of soil CH4 uptake in fertilized soil. Like in humid ecosystems, N gas loss via nitrification or denitrification appears to increase with increases in N and water availability during ecosystem development. Our results suggest that, with some exceptions, the drivers of soil GHG fluxes in semiarid ecosystems are often similar to those observed in more humid ecosystems

A positive relationship between the abundance of ammonia oxidizing archaea and natural abundance δ15N of ecosystems

We present a significant relationship between the natural abundance isotopic composition of ecosystem pools and the abundance of a microbial gene. Natural abundance 15N of soils and soil DNA were analysed and compared with archaeal ammonia oxidizer abundance along an elevation gradient in northern Arizona and along a substrate age gradient in Hawai'i. There was a significant positive correlation between the abundance of archaeal amoA genes and natural abundance δ15N of total soil or DNA suggesting that ammonia oxidizing archaea play an important role in ecosystem N release. © 2013 Elsevier Ltd

Evaluation of school health instruction in public primary schools in Bonny Local Government Area, Rivers state

Background: Effective school health instruction in primary schools is  essential in addressing the health risks and needs of school age children and adolescents. This study sought to evaluate the status of schoolhealth instruction in public primary schools in Bonny Local Government Area.Method: This is a cross sectional school based study carried out in 20 public primary schools in Bonny Local Government Area, Rivers State, in March 2006. The availability of the various components of the school health instruction programme was evaluated using an evaluation scale. Components had weighted scores. The minimum acceptable and maximumattainable scores for school health instruction were 31 and 47. Data was analyzed using SPSS version 11.Results: There were a total of 100 teachers in all the schools. The teacher population per school ranged from 2 to 13 with a mean of 5±2.77SD. The pupil population of the schools ranged between 100-1460 with a mean of352±336SD. Teacher/pupil ratio per school ranged from 1: 30 to 1: 128. Fourteen (70%) schools had teacher/pupil ratio less than 1:40. There was no professional health instructor in all the schools. Four schools (20%) allotted 3 periods per week to health teaching, while the rest (80%)  allotted less than 3 periods per week. HIV/AIDS was not in the health education curriculum being used. The only teaching method used by all the schools was the direct teaching method. No school used teaching aids; noschool went on field trips. Teachers did not receive in-service training on health education. No school attained the minimum acceptable score of 31 points using the evaluation scale.Conclusion: School health instruction was poorly implemented in the primary schools investigated. Teachers were not adequately prepared for health teaching and the classrooms were overcrowded.Keywords: School; Health instruction, Evaluatio

Hand washing practices amongst medical students in Port Harcourt, Nigeria

Background: Hand washing with soap and water is one of the most effective and inexpensive means of preventing infections. Rates of hand washing are low world wide even amongst health care workers who are should know about its importance. The aim of the study was to evaluate the knowledge, attitudes and hand washing practices both in and outside the hospital amongst medical students in Port Harcourt.Method: This was a descriptive cross sectional survey carried out amongst randomly selected fourth to sixth year medical students of the University of Port Harcourt. A simple questionnaire exploring perceptions, attitudes and self reported behavior was used. Information obtained included biodata, awareness information and practice. Data were analyzed using descriptive statistics.Results: Two hundred and sixty one students participated in the study with a M: F of 1.5:1. Diarrhea diseases were most commonly recognised as being associated with contaminated hands. 37.6% washed their hands regularly after interacting with their patients while 33.9% did so only after the days work. 58.3% and 58.9% washed hands before meals and after defecating respectively. Use of soap was generally low. The greatest motivation for hand washing was fear of contracting disease, whilst constraints included lack of soap, forgetfulness and inconveniently located sinks.Conclusion: Hand washing rates are low amongst medical students in Port Harcourt. There is need for regular education and re-education.Key words: Hand washing practices; medical students; Port Harcourt

Mothers' Perception of Fever Management in Children

Background: Fever is a common problem in childhood. Most febrile episodes are managed at home before consultation in a health facility. Caregivers' response to fever will depend on their perception of its cause and knowledge of its management. This study aimed to evaluate mothers' perceptions of fever and its management in childhood.Methods: This was a descriptive hospital based study. It involved the distribution of 11 itemed questionnaires on fever and related questions to 151 mothers who brought their children to the Paediatrics outpatient clinic of University of Port Harcourt Teaching Hospital. Data was analyzed using descriptive statistics.Results: A total of 151 mothers participated with age range 19 years to 54 years with mean of 31.4±5.7SD. One hundred and thirteen (74.8%) defined fever as hotness of the body. Commonest associated symptom with fever was loss of appetite (71.5%). Commonest identified cause of fever was malaria (71 (47%) mothers). 115 (76.2%) mothers measured their children's body temperature by touching their forehead, while 21 (13.9%) used thermometer. Commonest action taken when there was fever was to administer Paracetamol (107 (70.9%)). Commonest identified complication of fever was convulsion (86(67.7%)).Conclusion: Knowledge of fever is good amongst mothers in Port Harcourt; however there is need to educate them on the use of thermometer and appropriate use of drugs.Keywords: Mothers Perception; Fever; Childre

Prevalence of alcohol consumption among secondary school students in Port Harcourt, Southern Nigeria

Background: Consumption of alcohol by secondary school students is a major public health concern globally, but its prevalence is not known in secondary schools in Port Harcourt.Objective: To determine the prevalence and factors associated with alcohol use among secondary school students in Port Harcourt.Methods: This was a cross sectional school based study conducted in Port Harcourt in March 2014. A 20 itemed structured, self -administered questionnaire was distributed to 1080 senior secondary 1 to 3 students from 10 public secondary schools selected through Multistage Sampling technique. Questions asked covered drinking of alcohol, frequency of drinking and being drunk in the past 30 days before the survey. Other behaviours sought were smoking of cigarette, use of cocaine and going out in the evening for fun. Sociodemographic was also sought. Data was analyzed using SPSS version 20.Results: 1080 students participated in the study, mean age 16.09±6SD and male to female ratio of 0.9: 1. Prevalence of current drinking of alcohol was 30.6% and 38.1% of current drinkers were also drunk in the past 30 days, with 17.2 % being very frequently drunk. The behaviour which showed a strong association with drinking of alcohol, being drunk and the frequency of being drunk was going out in the evening for fun and recreation. Gender showed a positive association with drinking of alcohol, as more males drank alcohol with in the past 30 days compared to the females (p=0.000). Smoking of cigarette in the past 30 days and truancy were positively associated with being drunk, while academic grades showed an inverse relationship with consumption of alcohol. Majority of those who drank alcohol (42.6%) were experimenting with alcohol, though 5.4% drank due to addiction. Majority (39.3%) bought their drinks from stores and supermarkets. The most Common problems experienced by the drinkers were fatigue, alcohol made them behave in ways they later regretted and it hurt their relationships.Conclusion: Alcoholism is a serious problem with secondaryschool students in Port Harcourt. It is linked with truancy, poor academic achievement and other substances use. The most serious health and social problem experienced by the drinkers is addiction.Keywords: Prevalence, Alcohol, Secondary school, Consumption

Closely Related Tree Species Differentially Influence the Transfer of Carbon and Nitrogen from Leaf Litter Up the Aquatic Food Web

Decomposing leaf litter in streams provides habitat and nutrition for aquatic insects. Despite large differences in the nutritional qualities of litter among different plant species, their effects on aquatic insects are often difficult to detect. We evaluated how leaf litter of two dominant riparian species (Populus fremontii and P. angustifolia) influenced carbon and nitrogen assimilation by aquatic insect communities, quantifying assimilation rates using stable isotope tracers (13C, 15N). We tested the hypothesis that element fluxes from litter of different plant species better define aquatic insect community structure than insect relative abundances, which often fail. We found that (1) functional communities (defined by fluxes of carbon and nitrogen from leaf litter to insects) were different between leaf litter species, whereas more traditional insect communities (defined by relativized taxa abundances) were not different between leaf litter species, (2) insects assimilated N, but not C, at a higher rate from P. angustifolia litter compared to P. fremontii, even though P. angustifolia decomposes more slowly, and (3) the C:N ratio of material assimilated by aquatic insects was lower for P. angustifolia compared to P. fremontii, indicating higher nutritional quality, despite similar initial litter C:N ratios. These findings provide new evidence for the effects of terrestrial plant species on aquatic ecosystems via their direct influence on the transfer of elements up the food web. We demonstrate how isotopically labeled leaf litter can be used to assess the functioning of insect communities, uncovering patterns undetected by traditional approaches and improving our understanding of the association between food web structure and element cycling

Mothers’ recognition of newborn danger signs and health seeking behaviour

Background: Early recognition of neonatal illnesses followed by  care-seeking and intervention are key factors in improving neonatal health and survival.Objectives: To assess mothers’ ability to recognize newborn dangersigns and actions taken by mothers in the event of neonatal illness.Methods: The study was carried out in three health centres in Yenagoa Metropolis from April to May 2011. A 15 itemed Questionnaire based on the WHO/UNICEF IMCI programme handbook was administered to 146 mothers with infants younger than three months. The mothers were asked to identify danger signs of neonatal illness from a list of symptoms, to indicate which of the listed symptoms their babies experienced, to state what actions were taken in response to the symptoms and reasons for notutilizing orthodox healthcare.Results: None of the listed symptoms was recognized by up to halfthe mothers as danger signs of neonatal illness, the best being fast breathing by 66 (45.2%) mothers. Eighty two (56.2%) mothers reportedthat their children experienced some of the neonatal danger signs: the commonest were difficult breathing and convulsions in 8 (9.8%) cases each. Unconsciousness and excessive crying were thought to be caused by evil spirits and consultations sought with faith healers. The major constraint to utilization of health facilities was cost {45(29.8%)}.Conclusion: Mothers’ recognition of danger signs in the newborn was poor. Self-medication and the use of home remedies delayed timely  consultation. The commonest reason for non-utilization of health facilities was lack of money.Keywords: Mothers, Newborns, Danger signs, Recognition, Health seeking

Reaction time and incident cancer: 25 years of follow-up of study members in the UK Health and Lifestyle Survey

<b>Objectives</b><p></p> To investigate the association of reaction time with cancer incidence.<p></p> <b>Methods</b><p></p> 6900 individuals aged 18 to 94 years who participated in the UK Health and Lifestyle Survey in 1984/1985 and were followed for a cancer registration for 25 years.<p></p> <b>Results</b><p></p> Disease surveillance gave rise to 1015 cancer events from all sites. In general, there was essentially no clear pattern of association for either simple or choice reaction time with cancer of all sites combined, nor specific malignancies. However, selected associations were found for lung cancer, colorectal cancer and skin cancer.<p></p> <b>Conclusions</b><p></p> In the present study, reaction time and its components were not generally related to cancer risk

Willingness to participate in future HIV prevention studies among gay and bisexual men in Scotland, UK: a challenge for intervention trials

This article examines willingness to participate in future HIV prevention research among gay and bisexual men in Scotland, UK. Anonymous, self-complete questionnaires and Orasure Gäó oral fluid samples were collected in commercial gay venues. 1,320 men were eligible for inclusion. 78.2% reported willingness to participate in future HIV prevention research; 64.6% for an HIV vaccine, 57.4% for a behaviour change study, and 53.0% for a rectal microbicide. In multivariate analysis, for HIV vaccine research, greater age, minority ethnicity, and not providing an oral fluid sample were associated with lower willingness; heterosexual orientation and not providing an oral fluid sample were for microbicides; higher education and greater HIV treatment optimism were for behaviour change. STI testing remained associated with being more willing to participate in microbicide research and frequent gay scene use remained associated with being more willing to participate in behaviour change research. Having an STI in the past 12 months remained significantly associated with being willing to participate in all three study types. There were no associations between sexual risk behaviour and willingness. Although most men expressed willingness to participate in future research, recruitment of high-risk men, who have the potential to benefit most, is likely to be more challenging