2013 5th International Conference on Chemical,Biological and Environmental Engineering-ICBEE 2013

The ICBEE 2013 is sponsored by Asia-Pacific Chemical, Biological ＆ Environmental Engineering Society. The primary goal of the conference is to promote research and developmental activities in Chemical, Biological and Environmental Engineering. Another goal is to promote scientific information interchange between researchers, developers, engineers, students, and practitioners working in India and abroad. All ICBEE 2013 papers will be published in the APCBEE Procedia （Journal under Elsevier, ISSN： 2212-6708）, and will be included in ScienceDirect. One Excellent Paper will be selected from each oral session. The Certificate for Excellent Papers will be awarded in the Welcome Banquet on September 15, 2013.

Health implication among occupational exposed workers in a chromium alloy factory, Thailand

This study was conducted to assess the occupational exposure and its health impact on the chromium alloy workers. Environmental and biological monitoring, noise and audiometry measurements were done to evaluate the exposure levels in the factory. A total of 112 non-smoking workers were monitored from July 2001 to August 2002 The results showed that most of the chromium and lead exposures in the factory were below the ACGIH-TWA of 50 μg/m 3 for chromium(Ⅵ) and OSHA-PEL of 50 μg/m 3 for lead. The highest chromium(7 25±0 16 μg/m 3) and lead(14 50±0 29 μg/m 3) concentrations were measured in the vibro room. The results indicated that elevated concentrations of chromium and lead were found in both blood and urine samples especially in those areas which were characterized by poor ventilation. The metal contents in blood and urine samples were significantly correlated with airborne metal concentrations in the factory. The result demonstrated that blood and urinary levels among workers were associated with increasing age and duration of exposure. The background noise level of the factory ranged from 67 6 to 89 2 dBA and was frequently higher than the threshold limit value for noise(90 dBA). According to the audiometric test, the exposed workers showed signs of noise-induced hearing loss. Noise at work continued to be an important factor to hearing loss among exposed workers. In our statistical analysis, a significant hearing loss was established on age effect and year of exposure among the workforce.

New approach for time-resolved and dynamic investigations on nanoparticles agglomeration

Nanoparticle (NP) colloidal stability plays a crucial role in biomedical application not only for human and environmental safety but also for NP efficiency and functionality. NP agglomeration is considered as a possible process in monodispersed NP colloidal solutions, which drastically affects colloidal stability. This process is triggered by changes in the physicochemical properties of the surrounding media, such as ionic strength (IS), pH value, or presence of biomolecules. Despite different available characterization methods for nanoparticles (NPs), there is a lack of information about the underlying mechanisms at the early stage of dynamic behaviors, namely changing in NP size distribution and structure while placing them from a stable colloidal solution to a new media like biological fluids. In this study, an advanced in situ approach is presented that combines small angle X-ray scattering (SAXS) and microfluidics, allowing label-free, direct, time-resolved, and dynamic observations of the early stage of NP interaction/agglomeration initiated by environmental changes. It is shown for silica NPs that the presence of protein in the media enormously accelerates the NP agglomeration process compared to respective changes in IS and pH. High IS results in a staring agglomeration process after 40 min, though, in case of protein presence in media, this time decreased enormously to 48 s. These time scales show that this method is sensitive and precise in depicting the dynamics of fast and slow NP interactions in colloidal conditions and therefore supports understanding the colloidal stability of NPs in various media concluding in safe and efficient NP designing for various applications.

Spectroscopic Study on the Interaction of Al^3＋ with Flavonoids and BSA

The interaction of Chinese herbal medicine component flavonoids （morin and rutin） with trivalent aluminium ion and the complex of aluminium ion and Bovine Serum Albumin in Hank＇s artificial simulate body fluid was studied using UV-Vis absorption spectra. The result showed that morin and rutin could conjugate with Al^3＋ in Hank＇s artificial simulate body fluid. It was found that morin and rutin could competed with the complex of aluminium ion and Bovine Serum Albumin for aluminium ion. The mechanism of flavonoids and Bovine Serum Albumin compete aluminium ion was discussed, and the constant of rutin complex with aluminium ion was calculated.

Plant metabolomics and metabolic biology

Plants produce a large array of specialized metabolites（natural products）that not only are essential for growth and development,but also play important roles in adaptation to the variable stressful environments.Also,many plant metabolites are essential nutrient elements for humans and serve as natural drugs.However,study of the biosynthesis of natural products is still in its infancy,because more than 90%of plant metabolites are unknown and only a small number of genes/ enzymes involved in metabolism are identified in the model plants Arabidopsis and rice.