Abstract: A method for predicting mtDNA mutation threshold, fertility risk and oocyte retrieval number includes: establishing an incidence probability prediction model of mitochondrial mutation and estimating a mutation threshold s; establishing a fertility risk prediction model and predicting a fertility risk of a mutation carrier; and establishing an oocyte retrieval prediction model by binomial distribution and calculating oocyte retrieval number by PGT of a mutation carrier. The incidence probability prediction model is used to estimate a threshold value of common mtDNA mutations and predict a mother's fertility risk and the oocyte retrieval number by PGT. On the basis of the fertility risk prediction model and oocyte retrieval prediction model, the fertility risk and a minimum oocyte retrieval number by PGT needed to give birth to a healthy offspring can be calculated by knowing a mitochondrial DNA mutation ratio of mutation carrier which is helpful for genetic management and genetic consultation.

Abstract: A flame-retardant antibacterial composite polypropylene filter material and a preparation method thereof are disclosed. The filter material includes the following components in weight percent: 70-90 wt % of isotactic polypropylene, 3-10 wt % of a functional negative ion-releasing material, 3-10 wt % of a nano-antibacterial agent, 2-5 wt % of graphene oxide, 0.5-5 wt % of a flame retardant and 1-3 wt % of a dispersant. The filter material of the present invention can be prepared into network, fabric and other forms by the melt-blending extrusion, which can be applied for air pollutant removal in different environments. The functional negative ion-releasing material is a piezoelectric material, which can spontaneously produce negative oxygen ions, without consumption of energy or producing secondary pollution such as ozone. The released negative oxygen ions interact with positively charged particles in the air for settling, so as to quickly remove the particles.

Abstract: A flame-retardant antibacterial composite polypropylene filter material and a preparation method thereof are disclosed. The filter material includes the following components in weight percent: 70-90 wt % of isotactic polypropylene, 3-10 wt % of a functional negative ion-releasing material, 3-10 wt % of a nano-antibacterial agent, 2-5 wt % of graphene oxide, 0.5-5 wt % of a flame retardant and 1-3 wt % of a dispersant. The filter material of the present invention can be prepared into network, fabric and other forms by the melt-blending extrusion, which can be applied for air pollutant removal in different environments. The functional negative ion-releasing material is a piezoelectric material, which can spontaneously produce negative oxygen ions, without consumption of energy or producing secondary pollution such as ozone. The released negative oxygen ions interact with positively charged particles in the air for settling, so as to quickly remove the particles.