Soil extracellular enzyme activities and their stoichiometric characteristics following the conversion of natural forests to plantation in subtropical region.

We investigated the responses of soil extracellular enzyme activities and stoichiometric characteristics following the conversion of mixed conifer-broadleaf forest to plantation in the subtropical region. The results showed that the conversion from natural forest to plantation significantly reduced activities of cellulose hydrolase (CBH), β-D-glucosidase (βG), β-N-acetylglucosaminidase (NAG), acid phosphatase (AP) by 70.6%, 53.

Unusual Iron-Independent Ferroptosis-like Cell Death Induced by Photoactivation of a Typical Iridium Complex for Hypoxia Photodynamic Therapy.

Ferroptosis is a unique cell death mode that relies on iron and lipid peroxidation (LPO) and is extensively utilized to treat drug-resistant tumor. However, like the other antitumor model, requirement of oxygen limited its application in treating the malignant tumors in anaerobic environments, just as photodynamic therapy, a very promising anticancer therapy. Here, we show that an iridium(III) complex (Ir-dF), which was often used in proton-coupled electron transport (PCET) process, can induce efficient cell death upon photo irradiation, which can be effectively protected by the typical ferroptosis inhibitor Fer-1 but not by the classic iron chelating agents and ROS scavengers.