[en] The Aharonov-Bohm-like mesoscopic transport through a toroidal carbon nanotube (TCN) system coupled to two metallic electrodes has been investigated. The TCN is applied with a static magnetic flux, and the Zeeman effect also affects the transport properties. The novel oscillation structures are obtained in the zero-bias conductance, differential conductance and tunneling current, which are strongly associated with the structures of TCNs. The aperiodic and resonant behaviors are observed due to the Zeeman effect and finite size of TCNs. The conductance increases with the size of TCN. The tunneling current through metallic armchair TCN possesses rich oscillation structure compared with that of semiconducting zigzag TCN, and the conductance G>2e²/h is exhibited due to the interference effect. The I-V characteristics are calculated to exhibit nonlinear and stair-like behaviors. The stairs in the I-V characteristics for the zigzag TCN are associated with the resonant peaks of differential conductance versus source-drain bias

[en] The purpose of this article is to extract lignin-carbohydrate complexes (LCC) with poplar as raw material, which was used to prepare bio-carrier by freeze-drying method. The chemical properties and morphological of LCC porous biological carriers were analyzed by GPC, FT-IR, scanning electron microscopy (SEM) and optical microscopy. The FT-IR spectrum results indicated that LCC which are composed of lignin and polysaccharide, with a typical LCC structure. Galactose have a specific ability to recognize liver cells owing to the presence of receptors on hepatocytes. Cell counting results showed that the cells increases fastest while the proliferation rate of the liver cell in LCC is obviously higher than that of control group. These results indicated that poplar LCC is very biocompatible, in which it might be a great potential biological carrier material for human hepatocyte culture. (paper)