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In order to obtain high-quality super iron concentrate, a beneficiation experiment of "grinding- magnetic separation-reverse rotation" was earned out on an iron concentrate. The results show that magnetic separation was carried out at the grinding fineness of-0. 037 mm accounting for 95% by vertical mil and the magnetic field strength of 62. 4 kA/m, then flotation of magnetic separation concentrate was performed under the conditions when the dosage of sodium carbonate was 2 000 g/t, high temperature causticized starch was 200 g/t, and acidified dodecylamine was 120 g/e. Ultimately high-quality super iron concentrate were obtained, and the yield is 49.50%, the ton grade is 72.24%, the silicon dioxide content is 0. 08 %, and other impurities are minor. [ABSTRACT FROM AUTHOR]

Phytic acid-assisted sludge hydrothermal carbonization was employed to synthesize phytic acid-modified hydrochar via a one-step method. The surface morphology, pore structure, elemental composition, functional groups, and thermal stability of the phytic acid-modified hydrochar were characterized. Sorption kinetics and isotherm experiments were conducted to investigate the effects of humic acid, temperature, and pH on the sorption process of cadmium （Cd） onto the phytic acid-modified hydrochar. The Cd fixation ability was evaluated through soil passivation experiments. The results demonstrated that the surface of the phytic acid-modified hydrochar exhibited an abundance of phosphoric acid groups, enhanced electronegativity, and thermal stability. Furthermore, both the sorption rate and maximum sorption capacity for Cd increased by 1.88 times and 1.22 times compared to that in unmodified hydrochar, respectively, owing to the presence of phosphoric acid groups that enhanced complexation and electrostatic interaction with Cd. Elevated temperatures, higher pH values, and coexistence with humic acids were beneficial for enhancing Cd sorption onto phytic acid-modified hydrochar. When heavy metals such as Cu, Zn, and Pb coexisted, the sorption capacity of phytic acid-modified hydrochar for Cd was 0.77-6.88 times higher than that for other metals. Phyic acid-modified hydrochar exhibited excellent efficiency in fixing Cd （56.1%-81.l%）, mitigating the loss of available nutrients in soil and significantly increasing the AP content in the soil. In conclusion, the use of phytic acid-modified hydrochar could effectively remove Cd from water and serve as a promising soil amendment for stabilizing soil Cd content.

Reactive oxygen species (ROS) are crucial for signal transduction and the maintenance of cellular homeostasis. However, superfluous ROS may engender chronic pathologies. Feather keratin is a promising new source of antioxidant peptides that can eliminate excess ROS and potentially treat oxidative stress-related diseases, but the underlying mechanisms have remained elusive. This study investigated the antioxidant effects and mechanisms against H 2 O 2 -induced oxidative damage in HepG2 cells of the two latest discovered antioxidant peptides, CRPCGPTP (CP-8) and ANSCNEPCVR (AR-10), first decrypted from feather keratin. The results revealed that CP-8 and AR-10 did not exhibit cytotoxicity to HepG2 cells while reducing intracellular ROS accumulation. Simultaneously, they enhanced the activities of catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GSH-Px), thus alleviating H 2 O 2 -induced cell apoptosis. Molecular docking analysis demonstrated that CP-8, AR-10 interacted well with the key amino acids in the Kelch domain of Keap1, thereby directly disrupting the Keap1-Nrf2 interaction. The peptides' biosafety and antioxidant activity via Keap1/Nrf2 signaling lay the groundwork for further animal studies and applications as functional food additives.

Objective: To understand the status of abortion and risk factors among floating women of childbearing age and to provide reference for further improvement of induced abortion services in this population., Methods: Data on demography, working, and living conditions as well as the use of contraceptive among 4687 persons from a reproductive health survey regarding floating population in five cities in 2005, were involved, while multivariate logistic regression model was used to find out the relationship., Results: The risks of abortion among the younger than 30 age group and the 30 - 39 age groups were 2.21 times (95%CI: 1.47 - 3.34) and 2.38 times (95%CI: 1.53 - 3.70) of the 40 - 49 age group, respectively. The higher education degree these women had, the higher the risk of abortion was. The risks of abortion among groups having elementary, junior high, senior high school and above, were 2.15 times (95%CI: 1.15 - 4.03), 2.47 times (95%CI: 1.33 - 4.57) and 2.61 times (95%CI: 1.34 - 5.11) of those illiterate women. Those having working experience of 2 - 4 years, 5 years or above at the places where the survey was completed, the risks were 2.62 times (95%CI: 1.83 - 3.76) and 7.78 times (95%CI: 5.63 - 10.75) of the less than 2-year-experienced group. The abortion risk of floating women at childbearing age who were living together with their spouses was 1.49 (95%CI: 1.05 - 2.11) times of those women who were not., Conclusion: The demographic and lifestyle as well as working features of floating women at childbearing age might increase their risk of abortion. Providing health education regarding these risk factors on the floating women at childbearing age could effectively reduce and prevent the risk of abortion risk among them.