This study investigated the effects of dietary supplementation with the probiotic Bacillus pumilus on coho salmon(Oncorhynchus kisutch).A total of 360 juvenile fish,with an average initial weight of 130.75±1.33 g...This study investigated the effects of dietary supplementation with the probiotic Bacillus pumilus on coho salmon(Oncorhynchus kisutch).A total of 360 juvenile fish,with an average initial weight of 130.75±1.33 g,were randomly assigned to four treatment groups,each with three replicates of 30 fish.The fish were then fed for 70 days using formulated diets containing four concentrations of B.pumilus:0(control group),2×10^(6),4×10°,and 8×10^(10)aFU/g.We then evaluated growth,nutrient metabolism,immune-related serum biochemical markers,enzyme activity,gene expression,and muscle composition.Additionally,we assessed intestinal histology and microbiota composition.Our findings revealed that B.pumilus significantly improved growth,protein and fat metabolism,and immune function compared to the control group.It also had a positive effect on the structure and function of the intestinal microbiota.The group receiving 4×10^(8) CFU/g showed the greatest improvements.Overall,B.pumilus appears to be a promising probiotic for enhancing the health and performance of coho salmon in aquaculture.展开更多
Antiozonants and antioxidants are additives commonly used in the rubber industry to enhance the durability and performance of rubber products. Ozone, present in the atmosphere, can cause rubber to degrade over time th...Antiozonants and antioxidants are additives commonly used in the rubber industry to enhance the durability and performance of rubber products. Ozone, present in the atmosphere, can cause rubber to degrade over time through a process known as ozone cracking. These rubber additives are added to rubber compounds to protect against this degradation. They work by reacting with ozone, preventing it from attacking and breaking the molecular chains in the rubber, helping to maintain the structural integrity of the rubber product. It is now well known that 6PPD contributes to the extension of the service life of rubber products. However, recent studies have shown that 6PPD can be harmful to the environment, especially when end-of-life tyres (ELTs) are contaminated with the water. With the effect of ozone, 6PPD is converted to 6PPD quinone, which is toxic enough to kill some sensitive fish species such as Coho Salmon (Oncorhynchus kisutch). This study drew attention to new chemical compounds and natural products that can be used as antiozonants and antioxidants in the rubber industry instead of 6PPD. Although the scientific studies are promising, the fact that 6PPD is still used in production shows that more scientific studies and social awareness need to be developed in this area.展开更多
基金supported by grants from the Scientific Research Foundation for the Introduced Talents of Guangxi Minzu University(2018KJQD14)National Natural Science Foundation of China(32303053)Innovation-driven development special fund project of Guangxi(AA17204044).
文摘This study investigated the effects of dietary supplementation with the probiotic Bacillus pumilus on coho salmon(Oncorhynchus kisutch).A total of 360 juvenile fish,with an average initial weight of 130.75±1.33 g,were randomly assigned to four treatment groups,each with three replicates of 30 fish.The fish were then fed for 70 days using formulated diets containing four concentrations of B.pumilus:0(control group),2×10^(6),4×10°,and 8×10^(10)aFU/g.We then evaluated growth,nutrient metabolism,immune-related serum biochemical markers,enzyme activity,gene expression,and muscle composition.Additionally,we assessed intestinal histology and microbiota composition.Our findings revealed that B.pumilus significantly improved growth,protein and fat metabolism,and immune function compared to the control group.It also had a positive effect on the structure and function of the intestinal microbiota.The group receiving 4×10^(8) CFU/g showed the greatest improvements.Overall,B.pumilus appears to be a promising probiotic for enhancing the health and performance of coho salmon in aquaculture.
文摘Antiozonants and antioxidants are additives commonly used in the rubber industry to enhance the durability and performance of rubber products. Ozone, present in the atmosphere, can cause rubber to degrade over time through a process known as ozone cracking. These rubber additives are added to rubber compounds to protect against this degradation. They work by reacting with ozone, preventing it from attacking and breaking the molecular chains in the rubber, helping to maintain the structural integrity of the rubber product. It is now well known that 6PPD contributes to the extension of the service life of rubber products. However, recent studies have shown that 6PPD can be harmful to the environment, especially when end-of-life tyres (ELTs) are contaminated with the water. With the effect of ozone, 6PPD is converted to 6PPD quinone, which is toxic enough to kill some sensitive fish species such as Coho Salmon (Oncorhynchus kisutch). This study drew attention to new chemical compounds and natural products that can be used as antiozonants and antioxidants in the rubber industry instead of 6PPD. Although the scientific studies are promising, the fact that 6PPD is still used in production shows that more scientific studies and social awareness need to be developed in this area.
