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The concentrations of heavy metals, Cd, Hg,
Pb, Cu and As in marine sediments from 138 sites located in the Beidaihe
near-shore area of Bohai bay, were analyzed to find out the distribution
characteristics of these heavy metals. Potential Ecological Risk index were
adopted to assess the heavy metals contamination, and the assessment results
indicated that the content of heavy metals in this area is in a low to moderate
level, while high values were found in the southwest and northeast region, and
the value in the middle region is comparatively low. The high pollution hazard
sites were close to the Renzaohe estuary and Shihe estuary and the high risk is
mainly led by Hg.
A new reversed-phase high performance liquid chromatography method was developed to quantitate the activity of xanthine oxidase involved in milk fat globule membrane with xanthine as the substrate and the separation of product (uric acid). The increment of uric acid in the reaction system was used to calculate the total activity of XO. The optimized assay conditions, linearity of detection, recovery of uric acid and chromatogram were developed in text, indicating this method is simple, rapid and efficient. It is an alternative potential method for the determination of the activity of XO in milk.
optimization algorithm (MBOA) is a new optimization algorithm inspired by the
characteristics of magnetotactic bacteria, which is a kind of polyphyletic
group of prokaryotes with the characteristics of magnetotaxis that make them orient
and swim along geomagnetic field lines. The original Magnetotactic Bacteria
Optimization Algorithm (MBOA) and several new variants of MBOA mimics the interaction
energy between magnetosomes chains to obtain moments for solving problems. In
this paper, Magnetotactic Bacteria Optimization Algorithm with the Best Individual-guided
Differential Interaction Energy (MBOA-BIDE) is proposed. We improved
interaction energy calculation by using the best individual-guided？differential interaction energy formation. We focus on analyzing the performance of different
parameters settings. The experiment results show that the proposed algorithm is
sensitive to parameters settings on some functions.