436 research outputs found
Ghana's evolving protein economy
This paper provides an initial analysis of Ghana's protein economy in the light on current debates about nutritional transition and livestock revolution. Ghana's strong economic growth and reducing levels of poverty make it a particularly interesting case. Protein-rich foods, including fish and livestock products, supply 20-40 percent of protein consumed. Overall fish is becoming less important and poultry more important; but there also are large difference in household expenditure on protein-rich foods across wealth categories, regions and areas. Specifically, the protein element of the nutritional transition and the consumption side of the livestock revolution would appear to be unfolding at different speeds and in different ways, along an axis that is urban-south-non-poor at one end, and rural-north-poor at the other. We explore the policy and political economy dimensions of these change
Techniques for Arbuscular Mycorrhiza Inoculum Reduction
It is well established that arbuscular mycorrhizal (AM) fungi can play a significant role in sustainable crop production and environmental conservation. With the increasing awareness of the ecological significance of mycorrhizas and their diversity, research needs to be directed away from simple records of their occurrence or casual speculation of their function (Smith and Read 1997). Rather, the need is for empirical studies and investigations of the quantitative aspects of the distribution of different types and their contribution to the function of ecosystems.
There is no such thing as a fungal effect or a plant effect, but there is an interaction between both symbionts. This results from the AM fungi and plant community size and structure, soil and climatic conditions, and the interplay between all these factors (Kahiluoto et al. 2000). Consequently, it is readily understood that it is the problems associated with methodology that limit our understanding of the functioning and effects of AM fungi within field communities.
Given the ubiquous presence of AM fungi, a major constraint to the evaluation of the activity of AM colonisation has been the need to account for the indigenous soil native inoculum. This has to be controlled (i.e. reduced or eliminated) if we are to obtain a true control treatment for analysis of arbuscular mycorrhizas in natural substrates. There are various procedures possible for achieving such an objective, and the purpose of this chapter is to provide details of a number of techniques and present some evaluation of their advantages and disadvantages.
Although there have been a large number of experiments to investigated the effectiveness of different sterilization procedures for reducing pathogenic soil fungi, little information is available on their impact on beneficial organisms such as AM fungi. Furthermore, some of the techniques have been shown to affect physical and chemical soil characteristics as well as eliminate soil microorganisms that can interfere with the development of mycorrhizas, and this creates difficulties in the interpretation of results simply in terms of possible mycorrhizal activity.
An important subject is the differentiation of methods that involve sterilization from those focussed on indigenous inoculum reduction. Soil sterilization aims to destroy or eliminate microbial cells while maintaining the existing chemical and physical characteristics of the soil (Wolf and Skipper 1994). Consequently, it is often used for experiments focussed on specific AM fungi, or to establish a negative control in some other types of study. In contrast, the purpose of inoculum reduction techniques is to create a perturbation that will interfere with mycorrhizal formation, although not necessarily eliminating any component group within the inoculum. Such an approach allows the establishment of different degrees of mycorrhizal formation between treatments and the study of relative effects.
Frequently the basic techniques used to achieve complete sterilization or just an inoculum reduction may be similar but the desired outcome is accomplished by adjustments of the dosage or intensity of the treatment. The ultimate choice of methodology for establishing an adequate non-mycorrhizal control depends on the design of the particular experiments, the facilities available and the amount of soil requiring treatment
Confirmation of beach accretion by grain-size trend analysis: Camposoto beach, Cádiz, SW Spain
An application of the grain size trend analysis
(GSTA) is used in an exploratory approach to characterize
sediment transport on Camposoto beach (Cádiz, SW Spain).
In May 2009 the mesotidal beach showed a well-developed
swash bar on the upper foreshore, which was associated
with fair-weather conditions prevailing just before and during
the field survey. The results were tested by means of an
autocorrelation statistical test (index I of Moran). Two sedimentological
trends were recognized, i.e. development towards
finer, better sorted and more negatively skewed
sediment (FB–), and towards finer, better sorted and less
negatively or more positively skewed sediment (FB+). Both
vector fields were compared with results obtained from
more classical approaches (sand tracers, microtopography
and current measurements). This revealed that both trends
can be considered as realistic, the FB+ trend being identified
for the first time in a beach environment. The data demonstrate
that, on the well-developed swash bar, sediment
transported onshore becomes both finer and better sorted
towards the coast. On the lower foreshore, which exhibits a
steeper slope produced by breaking waves, the higherenergy
processes winnow out finer particles and thereby
produce negatively skewed grain-size distributions. The upper
foreshore, which has a flatter and smoother slope, is
controlled by lower-energy swash-backwash and overwash
processes. As a result, the skewness of the grain-size distributions
evolves towards less negative or more positive
values. The skewness parameter appears to be distributed
as a function of the beach slope and, thus, reflects variations
in hydrodynamic energy. This has novel implications for
coastal management
Micronutrient status and intervention programs in Malaysia
Approximately 70% of the world's malnourished children live in Asia, giving that region the highest concentration of childhood malnutrition worldwide. Prevalence of stunting and underweight are high especially in south Asia where one in every two preschool children is stunted. Iron-deficiency anemia affects 40%-50% of preschool and primary schoolchildren. Nearly half of all vitamin A deficiency and xerophthalmia in the world occurs in south and southeast Asia. Iodine deficiency disorders have resulted in high goiter rates in India, Pakistan, and parts of Indonesia. Compared with other developing countries in Asia, the nutrition situation in Malaysia is considerably better, owing to rapid economic and socioeconomic development that has occurred since Malaysia gained its independence in 1957. Prevalence of undernutrition and micronutrient deficiency is markedly lower in Malaysian children. Nonetheless, undernutrition in the form of underweight, stunting, and anemia can be found in poor communities throughout the country. A prevalence of 25% underweight and 35% stunting is reported among young children from poor rural households. Anemia and subclinical forms of vitamin A deficiency were reported in children under 5 years old. Typical of a country in nutrition transition, Malaysia faces the dual burden of malnutrition in children, with the persistence of undernutrition problems especially among the poor and the emerging overweight problem especially in urban areas. Since 1996, nutrition programs of the government sector are coordinated under the National Plan of Action for Nutrition. These activities and other nutrition intervention efforts by other agencies are discussed in this paper
Deployment of mating disruption dispensers before and after first seasonal male flights for the control of Aonidiella aurantii in citrus
The rejection of citrus fruit caused by infestations of the California red scale (CRS), Aonidiella aurantii (Maskell) (Hemiptera: Diaspididae), raises concerns about its management. This fact has led to the introduction of new integrated control methods in citrus orchards, including the implementation of techniques based on pheromones. Previous works described efficient mating disruption pheromone dispensers to control A. aurantii in the Mediterranean region. The main aims of the present study were to adjust the timing of dispenser applications and study the importance of controlling the early first generation of A. aurantii by testing two different application dates: before and after the first CRS male flight. The efficacy of the different mating disruption strategies was tested during 2010 in an experimental orchard and these results were confirmed during 2011 in a commercial citrus farm. Results showed that every mating disruption strategy achieved significantly lower male captures in monitoring pheromone traps compared with untreated plots, as well as mean fruit infestation reductions of about 80 %. The control of the first CRS generation is not essential for achieving a good efficacy as demonstrated in two locations with different pest pressure. The late application of MD dispensers before the second CRS male flight has proven to be effective, suggesting a new advantageous way to apply mating disruption.The authors want to thank Fernando Alfaro from Denia, Antonio Caballero, and Javier Macias from Rio Tinto Fruit S.A. (Huelva, Spain) for field support. We also thank Ecologia y Proteccion Agricola SL for the pheromone supply. This work has been funded by the Spanish Ministry of Science and Innovation (project AGL2009-10725) and Agroalimed Foundation. The translation of this paper was funded by the Universidad Politecnica de Valencia (Spain).Vacas González, S.; Alfaro Cañamás, C.; Primo Millo, J.; Navarro-Llopis, V. (2015). Deployment of mating disruption dispensers before and after first seasonal male flights for the control of Aonidiella aurantii in citrus. Journal of Pest Science. 88(2):321-329. https://doi.org/10.1007/s10340-014-0623-1S321329882Avidov Z, Balshin M, Gerson U (1970) Studies on Aphytis coheni, a parasite of the California red scale, Aonidiella aurantii in Israel. Biocontrol 15:191–207Barzakay I, Hefetz A, Sternlicht M, Peleg BA, Gokkes M, Singer G, Geffen D, Kronenberg S (1986) Further field trials on management of the California red scale, Aonidiella aurantii, by mating disruption with its sex-pheromone. Phytoparasitica 14:160–161Bedford ECG (1996) Problems which we face in bringing red scale, Aonidiella aurantii (Maskell), under biological control in citrus in South Africa. 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J Econ Entomol 78:73–79Levitin E, Cohen E (1998) The involvement of acetylcholinesterase in resistance of the California red scale shape Aonidiella aurantii to organophosphorus pesticides. Entomol Exp Appl 88:115–121Lykouressis D, Perdikis D, Samartzis D, Fantinou A, Toutouzas S (2005) Management of the pink bollworm Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae) by mating disruption in cotton fields. Crop Prot 24:177–183McLaren IW, Buchanan GA (1973) Parasitism by Aphytis chrysomphali Mercet and A. melinus Debach of Californian red scale, Aonidiella aurantii (Maskell), in relation to seasonal availability of suitable stages of the scale. Austr J Zool 21:111–117Moreno DS, Kennett CE (1985) Predictive year-end California red scale (Homoptera: Diaspididae) orange fruit infestations based on catches of males in the San-Joaquin Valley. 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Vitamin A deficiency and inflammatory markers among preschool children in the Republic of the Marshall Islands
BACKGROUND: The exclusion of individuals with elevated acute phase proteins has been advocated in order to improve prevalence estimates of vitamin A deficiency in surveys, but it is unclear whether this will lead to sampling bias. The purpose of the study was to determine whether the exclusion of individuals with elevated acute phase proteins is associated with sampling bias and to characterize inflammation in children with night blindness. METHODS: In a survey in the Republic of the Marshall Islands involving 281 children, aged 1–5 years, serum retinol, C-reactive protein (CRP), and α(1)-acid glycoprotein (AGP) were measured. RESULTS: Of 281 children, 24 (8.5%) had night blindness and 165 (58.7%) had serum retinol <0.70 μmol/L. Of 248 children with AGP and CRP measurements, 123 (49.6%) had elevated acute phase proteins (CRP >5 mg/L and/or AGP >1000 mg/L). Among children with and without night blindness, the proportion with serum retinol <0.70 μmol/L was 79.2% and 56.8% (P = 0.03) and with anemia was 58.3% and 35.7% (P = 0.029), respectively. The proportion of children with serum retinol <0.70 μmol/L was 52.0% after excluding children with elevated acute phase proteins. Among children with and without elevated acute phase proteins, mean age was 2.8 vs 3.2 years (P = 0.016), the proportion of boys was 43.1% vs. 54.3% (P = 0.075), with no hospitalizations in the last year was 11.0% vs 23.6% (P = 0.024), and with anemia was 43.8% vs 31.7% (P = 0.05), respectively. CONCLUSIONS: Exclusion of children with inflammation in this survey of vitamin A deficiency does not improve prevalence estimates for vitamin A deficiency and instead leads to sampling bias for variables such as age, gender, anemia, and hospitalization history
Sex Differences in Obesity Associated with Total Fertility Rate
The identification of biological and ecological factors that contribute to obesity may help in combating the spreading obesity crisis. Sex differences in obesity rates are particularly poorly understood. Here we show that the strong female bias in obesity in many countries is associated with high total fertility rate, which is well known to be correlated with factors such as low average income, infant mortality and female education. We also document effects of reduced access to contraception and increased inequality of income among households on obesity rates. These results are consistent with studies that implicate reproduction as a risk factor for obesity in women and that suggest the effects of reproduction interact with socioeconomic and educational factors. We discuss our results in the light of recent research in dietary ecology and the suggestion that insulin resistance during pregnancy is due to historic adaptation to protect the developing foetus during famine. Increased access to contraception and education in countries with high total fertility rate might have the additional benefit of reducing the rates of obesity in women
A descriptive model of patient readiness, motivators, and hepatitis C treatment uptake among Australian prisoners
Background: Hepatitis C virus infection (HCV) has a significant global health burden with an estimated 2%–3% of the world's population infected, and more than 350,000 dying annually from HCV-related conditions including liver failure and liver cancer. Prisons potentially offer a relatively stable environment in which to commence treatment as they usually provide good access to health care providers, and are organised around routine and structure. Uptake of treatment of HCV, however, remains low in the community and in prisons. In this study, we explored factors affecting treatment uptake inside prisons and hypothesised that prisoners have unique issues influencing HCV treatment uptake as a consequence of their incarceration which are not experienced in other populations. Method and Findings: We undertook a qualitative study exploring prisoners' accounts of why they refused, deferred, delayed or discontinued HCV treatment in prison. Between 2010 and 2013, 116 Australian inmates were interviewed from prisons in New South Wales, Queensland, and Western Australia. Prisoners experienced many factors similar to those which influence treatment uptake of those living with HCV infection in the community. Incarceration, however, provides different circumstances of how these factors are experienced which need to be better understood if the number of prisoners receiving treatment is to be increased. We developed a descriptive model of patient readiness and motivators for HCV treatment inside prisons and discussed how we can improve treatment uptake among prisoners.Conclusion: This study identified a broad and unique range of challenges to treatment of HCV in prison. Some of these are likely to be diminished by improving treatment options and improved models of health care delivery. Other barriers relate to inmate understanding of their illness and stigmatisation by other inmates and custodial staff and generally appear less amenable to change although there is potential for peer-based education to address lack of knowledge and stigma
Concentration and mobility of copper and zinc in the hypergenic zone of a highly urbanized area
Health-seeking behaviours of older black women living with non-communicable diseases in an urban township in South Africa
BACKGROUND: Various studies have shown that non-communicable diseases (NCDs) especially diabetes and
hypertension are prevalent among older women living in South African urban areas, placing a heavy burden on
the healthcare system. This study aimed to understand the health-seeking behaviour, healthcare practices and
prevalence of traditional herbal medicine (THM) use among older women self-reporting NCDs from the
Prospective Urban Rural Epidemiology study (PURE).
METHOD: A homogenous purposive sampling of PURE participants was used to recruit women who were
50 years or older (n = 250). Descriptive statistics were used to examine the number of NCDs reported by the
study sample, health seeking behaviour and practices as well as THM use. Logistic regression was also employed
to investigate possible associations between reported conditions and THM use or medical pluralism.
RESULTS: Within the study sample, 72 % self-reported an NCD. Of those with self-reported NCDs, 46 % had one,
and 54 % had two or more NCDs. Those with NCDs usually visited public clinics (80 %), relied on doctors (90 %)
and nurses (85 %) for health information, and mostly used conventional medicine (CM) to manage high blood
pressure (81 %). About 30 % of those with NCDs indicated using THM, of whom 29 (53 %) reported practicing
medical pluralism. Participants with dental problems (OR: 3.24, 95 % CI: 1.30–8.20), headaches (OR: 2.42, 95 % CI:
1.24–4.94), heart burn (OR: 2.30, 95 % CI: 1.18–4.48) and severe tiredness (OR: 2.05, 95 % CI: 1.08–3.99) were more
likely to use THM. Anxiety and allergies increased the likelihood to practise medical pluralism by five and 20 times,
respectively.
CONCLUSION: Self-reported NCD with co-morbidities was prevalent among the participants in the study. Most of the
study participants utilized state-owned clinics and hospitals for the management of their chronic conditions. THM use
was not very common. However, among those who used THM, medical pluralism was prevalent. Family history was the
most common reason for THM use, with many THM patrons utilizing these for treatment of a health condition. Older
black women with anxiety and allergies were more likely to practise medical pluralism
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