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Tiehang Sun

Publications and source records attributed to Tiehang Sun.

2 recordsLinked to original sources
PubMed2002

[Interaction between microorganisms and heavy metals and its application].

Interactions between microorganisms and heavy metals were expatriated in many ways. Because of their resistance and detoxification to heavy metals, microorganisms are able to leach, absorb and transform heavy metals, which has been actively applied to extract heavy metals from low-rate ore in mine exploitation. Although heavy metals are toxic to microorganisms population and harmful to its processes, some special microorganisms have been applied to the treatment of industrial waste materials and the remediation of soils polluted by heavy metals. The application of microbiological biomass and activity to evaluating the pollution situation and ecological risk of heavy metals in environment media is also significant.

Bacteria↗
PubMed2002

[Toxicity effect of substituted benzenes in oilfield wastewater by molecular orbital method].

The quantum parameters of energy of highest occupied molecular orbital (EHOMO), energy of lowest unoccupied molecular orbital (ELUMO), energy of next highest occupied molecular orbital (ENHOMO), energy of next lowest unoccupied molecular orbital (ENLUMO), heat of molecular formation(delta H0f) and dipole moment (mu) of 55 substituted benzenes are calculated based on MOPAC software of molecular orbital AM1 method. The QSAR model of multiple descriptors was established by the above parameters and the parameters of first-order valence-corrected molecular connectivity index (1Xv), octanol-water partition coefficient (logP), observed 30 min-EC50 values of photobacteria. The QSAR model of 55 substituted benzenes was also established by two parameters of 1Xv and EHOMO. The toxicity mechanism of different substitutions was discussed. Results showed that the combination of quantum and physio-chemical parameters was very useful in predicting biological activity of substituted benzenes in oilfield wastewater. The quantum parameters were ideal parameters in describing the toxicity of organic compounds in oilfield wastewater.

Benzene↗