[Analysis of food sources of in rice-crab integrated ecosystem based on stable isotopes in saline-alkali land of the Yellow River Delta].

To explore food composition of Chinese mitten crab () in rice-crab integrated ecosystem in saline-alkali land of the Yellow River Delta, we analyzed carbon and nitrogen stable isotope ratios (δC and δN) in the crab and that in food sources, including plants (, , , , stem and leaf, rice grain), animals (benthos, zooplankton), organic debris and artificial feed (compound feed, corn meal) in Kenli District, Dongying, Shandong Province in June to October of 2020. Substantial differences in δC and δN were found among food sources. The δC and δN values of different food sources were in a range of -30.

Metabolites in the TCA Cycle Promote Resistance to Chloramphenicol of .

Antibiotic-resistant bacteria are a serious threat to human and animal health. Metabolite-enabled eradication of drug-resistant pathogens is an attractive strategy, and metabolite adjuvants, such as fumarate, are used for restoring the bactericidal ability of antibiotics. However, we show that metabolites in the TCA cycle increase the viability of against chloramphenicol (CAP), based on the survival assay of differential metabolites identified by LC-MS/MS.

[Seasonal variation of functional diversity of aquatic microbial community in Apostichopus japonicus cultural pond].

The functional diversity of aquatic microbial communities in sea cucumber (Apostichopus japonicus) cultural ponds was examined in this paper. The Biolog plate technique and redundancy analysis (RDA) method were used to evaluate seasonal changes and their relationships with environmental factors. The results showed that both total amount and types of carbon sources utilized by microbes in the sea cucumber cultural ponds varied seasonally, and were the highest in summer and lowest in winter, with polymers being the main type of carbon sources.