Nowadays cancers pose a great threat to the health of human beings. Based on studies on the flavonoids and other bioactive compounds of Citrus fruits in current literature, it was widely suggested that the consumption of Citrus fruits is beneficial to the prevention and treatment of human chronic diseases including cancers. In the past decades, the study concerning Citrus flavonoids has covered various areas including the type, content and distribution of flavonoids in fruits; their variation between wild and cultivated genotypes; their antioxidant, antiinflammation, anti-aging, antimicrobial and anticarcinogenic activities. To enlighten future Citrus germplasm study, this review introduces briefly the functions of main types of Citrus flavonoids, including antioxidant, antiinflammation and anti-aging activities, and their relationships to human cancers. Most importantly, the mechanisms of action by which Citrus flavonoids play their roles in human cancer prevention and treatment were summarized.
The thermoelectric properties of magnesium silicide samples prepared by Vacuum Plasma Spray (VPS) are compared with those made from the conventional hot press method using the same feedstock powder. Thermal conductivity, electrical conductivity, Seebeck coefficient, and figure of merit are characterized from room temperature to 700 K. X-ray diffraction and scanning electron microscopy of the samples are obtained to assess how phase and microstructure influence the thermoelectric properties. Carrier concentration and Hall mobility are obtained from Hall Effect measurements, which provide further insight into the electrical conductivity and Seebeck coefficient mechanisms. Low-temperature electrical conductivity measurements suggest a 3D variable range hopping effect in the samples. VPS samples achieved a maximum ZT = 0.16 at 700 K, which is around 30% of the hot press sample ZT = 0.55 at 700 K using the same raw powder. The results suggest that thermal spray is a potential deposition technique for thermoelectric materials.
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