Pulmonary function testing

As climate change leads to drier and warmer conditions in semi-arid regions, growing resource-intensive C3 and C4 crops will become more challenging. Such crops will be subjected to increased frequency and intensity of drought and heat stress. However, agaves, even more than pineapple (Ananas comosus) and prickly pear (Opuntia ficus-indica and related species), typify highly productive plants that will respond favorably to global warming, both in natural and cultivated settings. With nearly 200 species spread throughout the U.S., Mexico, and Central America, agaves have evolved traits, including crassulacean acid metabolism (CAM), that allow them to survive extreme heat and drought. Agaves have been used as sources of food, beverage, and fiber by societies for hundreds of years. The varied uses of Agave, combined with its unique adaptations to environmental stress, warrant its consideration as a model CAM crop. Besides the damaging cycles of surplus and shortage that have long beset the tequila industry, the relatively long maturation cycle of Agave, its monocarpic flowering habit, and unique morphology comprise the biggest barriers to its widespread use as a crop suitable for mechanized production. Despite these challenges, agaves exhibit potential as crops since they can be grown on marginal lands, but with more resource input than is widely assumed. If these constraints can be reconciled, Agave shows considerable promise as an alternative source for food, alternative sweeteners, and even bioenergy. And despite the many unknowns regarding agaves, they provide a means to resolve disparities between natural and human systems in semi-arid regions.

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Agave as a model CAM crop system for a warming and drying world

Agave sisalana Perr. Syn (Agavaceae) is cultivated for its fiber, ornamental and medicinal value. The plant contains saponin useful for soap making and pharmacological importance. It yields a stiff fiber traditionally used in making twine, rope and also dartboards. Despite their economic importance, the Agave spp. has not been genetically improved. In vitro propagation offers an alternative to this problem through the efficient cloning of selected high-yielding “elite” plants. The present review gives a brief account on this important fiber yielding and medicinal plant with special emphasis on the secondary metabolite and in vitro propagation.

	 

	Key words: Agave sisalana, saponin, in vitro propagation, fiber.

https://www.academicjournals.org/article/article1380378603_Debnath et al.pdf

Biotechnological intervention of Agave Sisalana: A unique fiber yielding plant with medicinal property

Aflatoxin – Publication analysis of a global health threat

Few studies have been done on the economic burden of occupational accidents and diseases to a country (as opposed to an enterprise). Where they have been done, it is in industrialized market economy countries. The report therefore analyses what has been achieved in the way of economic research in relation to occupational safety and health outcomes in developed countries, and what factors and methodologies have to be taken into account to get an idea of the costs to the national economy. It looks at the challenges in obtaining credible numbers of occupational accidents and diseases and the associated costs. It goes on to describe the sampling requirements that need to be met to be able to determine estimates of rates of occupational injury and diseases and costs in a country.

The overall idea is to raise awareness among policy-makers and decision-makers and facilitate policy integration by making the linkages between occupational safety and health and other policy interventions and to raise safety and health at work into the mainstream of the development agenda.

Estimating the economic costs of occupational injuries and illnesses in developing countries: Essential information for decision-makers

Background Few studies have focused on respiratory health effects among sisal workers. Aim To report on the prevalence of acute respiratory symptoms among sisal processors. Methods We interviewed 163 dust-exposed brushing and decortication workers and 31 low-exposed security workers from six sisal estates in Tanzania using a modified symptom score questionnaire to determine the prevalence of acute respiratory symptoms during work. Groups were compared using chi-square tests, Fisher's exact tests, t-tests and logistic regression, adjusting for confounding factors. Results After the first working day of the week, 73% of the brushing workers reported dry cough, 66% sneezing, 65% productive cough, 63% running nose and 34% stuffy nose. Brushing workers had a significantly higher prevalence of these symptoms than decortication workers. Brushing and decortication workers had significantly more dry cough and sneezing than the control group of security workers, when adjusting for age, smoking, past respiratory diseases and residence. Conclusion Processors of sisal fibre have a high prevalence of acute respiratory symptoms. More detailed studies on work and health in sisal estates are needed, including exposure studies.

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Acute respiratory symptoms among sisal workers in Tanzania.

Respiratory health among sisal workers has been an unresolved issue of concern for many years. The authors performed a 1-week follow-up questionnaire study on acute respiratory symptoms and cross-shift peak expiratory flows among 163 sisal brushing and decortication workers (exposed participants) and 31 security workers (control participants) from 6 sisal estates in Tanzania. The authors used the Optimal Symptom Score Questionnaire on Acute Respiratory Symptoms and the standardized American Thoracic Society and British Medical Research Council respiratory questionnaires. Decortication and brushing workers had a higher prevalence and higher severity scores of acute symptoms throughout the week than did control participants. Shortness of breath among brushing workers decreased (p < .01) from 39% on Monday to 20% on Friday. Brushing workers also had significantly higher prevalence of chronic sputum (30%) and chest tightness (48%) and the lowest preshift and postshift PEF values. The authors recommend preventive measures and further research.

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Prevalence of Respiratory Symptoms Among Sisal Processors in Tanzania

Information was collected on working conditions and personal exposures to dust, bacteria, and fungi in sisal fiber processing factories in Tanzania to identify health hazards and possible needs for preventive measures. Walkthrough surveys were performed in the brushing and decorticating departments of six sisal factories. The number of departments showing adequate scores for ergonomics and work organization, physical working environment, and occupational health items were determined. Personal thoracic dust samples were collected during sisal processing and analyzed for concentration of dust (n = 24) and for fungi and bacteria (n = 32). In both departments, most items considered to be a prerequisite for a good working environment were either missing or inadequate. Ergonomic and physical hazards were observed. Repetitive strenuous tasks, awkward work postures, and high noise levels were found. Visible dust and inadequate ventilation were seen in the brushing departments, and wet floors were observed in the ...

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Working Conditions and Exposure to Dust and Bioaerosols in Sisal Processing Factories in Tanzania

OBJECTIVE: To study dust exposure and inflammatory reactions in the respiratory tract among coffee curing workers in Tanzania. METHODS: A cross-sectional study was conducted in a Tanzanian coffee curing factory. Coffee workers (n = 15) were compared with unexposed controls (n = 18); all workers were nonsmokers. Exhaled nitric oxide was examined using an electrochemistry-based NIOX MINO device. Personal air samples were analyzed for total dust and endotoxins, using gravimetric analysis and the chromogenic Limulus amebocyte lysate endpoint assay, respectively. RESULTS: Total dust levels ranged from 0.2 to 27.9 mg/m, and endotoxin levels ranged from 42 to 75,083 endotoxin units/m. Concentrations of exhaled nitric oxide, analyzed by linear regression and adjusted for age (β = 0.57; 95% confidence interval, 0.08 to 1.06; P = 0.02), was higher among coffee workers than among the control group. CONCLUSION: The results indicate a relationship between the coffee dust and signs of respiratory inflammation. (Less)

Respiratory inflammation among workers exposed to airborne dust with endotoxins in a coffee curing factory.

Background
Primary coffee processing takes place in countries where coffee is grown, and may include hand picking of coffee to remove low quality beans. Hand picking is mostly performed by women. No previous studies on dust and respiratory health have been performed in this occupational group, although studies indicate respiratory problems among other coffee production workers.

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Akwilina V. Kayumba

Papers

Acute respiratory symptoms among sisal workers in Tanzania.

Prevalence of Respiratory Symptoms Among Sisal Processors in Tanzania

Working Conditions and Exposure to Dust and Bioaerosols in Sisal Processing Factories in Tanzania

Respiratory inflammation among workers exposed to airborne dust with endotoxins in a coffee curing factory.

Endotoxin, dust and exhaled nitrogen oxide among hand pickers of coffee; a cross-sectional study