Search

Microbial necromass carbon (MNC) is a crucial source for stable soil carbon pool, and understanding its response to carbon inputs from both aboveground (litter) and belowground (roots) in subtropical forest soils is essential for assessing soil carbon stocks in global ecosystems. In a Castanopsis carlesii plantation at the Sanming Forest Ecosystem National Observation and Research Station in Fujian Province, we conducted an experiment with five treatments, including root removal (NR), aboveground litter removal (NL), no litter input (removals of both aboveground litter and roots, NI), double aboveground litter addition (DL), and control (CK). After seven years, we collected soil samples in the 0-10 cm soil layer to examine changes in MNC content and its contribution to soil organic carbon (SOC). Results showed that NR treatment reduced MNC, bacterial necromass carbon (BNC), and fungal necromass carbon (FNC) by 15.9%, 20.2%, and 14.5%, respectively, while other treatments did not induce significant changes. The NR, NL, NI, and DL treatments did not affect the contributions of BNC, FNC, and MNC to SOC. Correlation and path analyses revealed that litter and root carbon input treatments could alter the MNC content directly or indirectly through changing soil available substrates and microbial community structure. Our results suggested that roots exert a stronger influence on the maintenance of MNC than aboveground carbon source in the mid-subtropical plantations. [ABSTRACT FROM AUTHOR]

Antibacterial photodynamic therapy (APDT) has received considerable attention owing to its superiority. ZIF‐8 was used to address the poor stability of the photosensitizer Rose Bengal (RB) encapsulation to synthesize RB@ZIF‐8 NPs, which were doped into a composite film with poly (ϵ‐caprolactone) (PCL) and polyvinyl alcohol‐quaternary ammonium chitosan (PVA‐QCS) as substrates to form composite films (PQZ). The composite films exhibited excellent photodynamic sterilization and good resistance to bacterial adhesion. The tensile strength of the film increased to 43.4 MPa, which was approximately 1.8 times that of the PCL film. With the addition of SiO2 and RB@ZIF‐8 NPs, the film exhibited water repellency and UV‐blocking properties. RAW264.7 cells were selected using the MTT method to confirm that the composite films had excellent biocompatibility and had no significant inhibitory effect on cell growth and reproduction. PQZ multifunctional composite films show potential as novel APDT antimicrobial materials for food packaging. [ABSTRACT FROM AUTHOR]

In contrast to black CsPbI3 perovskite, yellow non-perovskite δ-CsPbI3 is thermodynamically more stable at room temperature and in humid conditions, but exhibits negligible photocatalytic activity due to its severe recombination of photogenerated charges. Here, we report a strategy to promote the charge separation in a composite of δ-CsPbI3 and TaPt-TP-COF by targeted deposition of metallic Pt particles on δ-CsPbI3. The photoluminescence band stemming from the recombination of excitons in δ-CsPbI3 is significantly quenched when attached to TaPt-TP-COF. The δ-CsPbI3, Pt@δ-CsPbI3 and δ-CsPbI3@TaPt-TP-COF exhibit negligible photocatalytic hydrogen evolution (PHE) from water in the presence of a triethanolamine electron donor, whereas the Pt@δ-CsPbI3@TaPt-TP-COF demonstrates a remarkable improvement in PHE rate. In addition, the Pt@δ-CsPbI3@TaPt-TP-COF also presents high stability in solution conditions. [ABSTRACT FROM AUTHOR]