Air pollution and livestock production

The air in a livestock farming environment contains high concentrations of dust particles and gaseous pollutants. The total inhalable dust can enter the nose and mouth during normal breathing and the thoracic dust can reach into the lungs. However, it is the respirable dust particles that can penetrate further into the gas-exchange region, making it the most hazardous dust component. Prolonged exposure to high concentrations of dust particles can lead to respiratory health issues for both livestock and farming staff. Ammonia, an example of a gaseous pollutant, is derived from the decomposition of nitrous compounds. Increased exposure to ammonia may also have an effect on the health of humans and livestock. There are a number of technologies available to ensure exposure to these pollutants is minimised. Through proactive means, (the optimal design and management of livestock buildings) air quality can be improved to reduce the likelihood of risks associated with sub-optimal air quality. Once air problems have taken hold, other reduction methods need to be applied utilising a more reactive approach. A key requirement for the control of concentration and exposure of airborne pollutants to an acceptable level is to be able to conduct real-time measurements of these pollutants. This paper provides a review of airborne pollution including methods to both measure and control the concentration of pollutants in livestock buildings

Personal determinants of organic food consumption: a review

Purpose - A lot of literature is available that discusses personal determinants of organic food consumption. However different models and determinants are used in the literature. This paper aims to provide an overview, within a framework linking Schwartz' values theory and the theory of planned behaviour (TPB). Also it seeks to focus on the importance of affective attitude, emotions, personal norm, involvement and uncertainty related to organic food consumption. Design/methodology/approach - The paper is based on secondary data sources, namely the literature concerning personal determinants of organic food consumption. Findings - Both the values theory and the theory of planned behaviour have been referred to as relevant theories for better understanding consumers' choice for organic food. Organic food consumption decisions can be explained by relating attributes of organic food with more abstract values such as "security", "hedonism", "universalism", "benevolence", "stimulation", "self-direction" and "conformity". Appealing to these values can positively influence attitudes towards organic food consumption. Besides attitude, subjective and personal norm and (perceived) behavioural control influence consumption of organic food. Research limitations/implications - More research related to the role of uncertainty (reduction) during the process of buying organic food is recommended. Practical implications - Relatively little research has examined the affective component of attitude and emotions in relation to organic food consumption, while these may play an important role as drivers of involvement and thus help to jolt food purchasers out of their routine of buying conventional food and set a first step to adopt organic food. Originality/value - To the authors' knowledge, this is the first paper providing a comprehensive overview and linking the literature on organic food consumption to the values theory and the theory of planned behaviour, including the role of personal norm and focusing on emotions. The proposed integration of mental processing in an organic food consumption model leads to interesting hypotheses and recommendations for policy makers, researchers and stakeholders involved in the organic food market

Activating Schemata in ESL Writing

My research aims at exploring the contribution of various types of schemata to leaners’ text comprehension and text production, especially ESL (English as a Second Language) writing, to better understand how ESL learners, especially Vietnamese graduate students, use diverse resources in schema activation to facilitate their processes of learning to write in the academic setting. To better understand these processes, the researcher synthesized previous studies together with conducting interviews with four Vietnamese graduate students and analyzing their writing samples to investigate the relationships among types of schemata: formal, content, and rhetorical schemata, which can be significant in ESL writing and composition pedagogy. Formal schemata refer to learners’ awareness and competence in technically linguistic expressions; content schemata refer to learners’ knowledge of reading and writing topics; and rhetorical schemata refer learners’ awareness of the contextual situations in which texts are created. The analyses in this research have found a substantial contribution of the three types of schemata to the reading and writing processes. The analyses in my research can possibly provide a better understanding of schemata to facilitate ESL learners’ reading and writing competence