Indoor air from swine finishing facilities was analyzed by olfactometry, gas chromatography (GC), and an electronic nose. Olfactometry used dynamic dilution triangular forced-choice. Air samples collected in Tedlar bags were analyzed using an AromaScan A32S electronic nose. Sixteen compounds, primarily nonsulfur protein metabolites were quantified by GC/mass spectrometry (MS) and an equation wa...

Abstract Green foods are usually harvested and stored before ripening, but excessive ethylene generated during storage can lead to the loss of vegetables fruits. Photocatalytic oxidation provides a promising method remove extend shelf life green foods. In this study, mesoporous nanosilica-loaded Ce6 composite nanomaterial (Ce6@SiO 2 ) was designed synthesized adsorb into its pores then degrade ...

Anopheles gambiae s.s. Giles, a highly anthropophilic mosquito species, is Africa's most important malaria vector (White, 1974). It has been shown that this species is attracted to 4.5% carbon dioxide (Knols et al., 1994a), a dose thought to be equivalent to what is emitted by humans during breathing. Also, evidence exists for an activating and attracting effect of carbon dioxide in the field (...

RATIONALE Storage trials were conducted for 2 to 3 months using a hydrocarbon and carbon dioxide gas mixture with known carbon isotopic composition to simulate typical hold times for gas samples prior to isotopic analysis. A range of containers (both pierced and unpierced) was periodically sampled to test for δ(13)C isotopic fractionation. METHODS Seventeen containers were tested for free-gas...

This article describes the development and evaluation of a small prototype instrument employing an array of four polymer-coated surface acoustic wave (SAW) sensors for rapid analysis of organic solvent vapors in exhaled breath and ambient air. A thermally desorbed adsorbent preconcentrator within the instrument is used to increase sensitivity and compensate for background water vapor. Calibrati...

in this paper, the performance evaluation of a two-way hybrid photovoltaic/thermal (pv/t) solar collector was analytically and experimentally carried out. mathematical expressions for operating parameters in glass to glass and glass to tedlar pv/t solar collectors were developed and experimentally validated by a glass to tedlar pv/t solar collector system. also the influence of air flow rate on...

BACKGROUND Sarcoidosis is a systemic granulomatous disease of unknown cause that affects the lungs in over 90% of cases. Breath analysis by electronic nose technology provides exhaled molecular profiles that have potential in the diagnosis of several respiratory diseases. OBJECTIVES We hypothesized that exhaled molecular profiling may distinguish well-characterized patients with sarcoidosis f...

BACKGROUND This study was performed to clarify variations in breath isoprene concentrations with age, gender, body mass index (BMI) and total serum cholesterol. Our cohort consisted of 205 adult volunteers of different smoking background without health complaints. Total cholesterol in blood serum was measured in 79 of these volunteers. METHODS Mixed expiratory exhaled breath was sampled using...

A new protocol was used to measure the quantity of reactive organic gases (ROG) being emitted from animal feeding operations (AFO) such as feed yards, dairies and poultry houses. The protocol makes use of a portable gas chromatograph (GC) that is brought to the field where actual measurements are taken in conjunction with the EPA flux chamber sampling protocol. To have the analyte concentration...