ABSTRACT
PM2.5 is composed of a particulate and gaseous pollutants in the air reaction, can carry a lot of material, including inorganic composition, organic compounds, trace metal elements, the carbon composition, biomass (bacteria, viruses, mold, etc.), can cause more bad influence.When pathogenic microorganisms carried by particles in the body, cause the function of cells and tissues, metabolism and the change of the structure, increase the sensitivity of bacteria, virus infection, make the body’ s resistance drops, induce infectious diseases. After when it enters the body of the respiratory tract, can colonize in the human respiratory tract mucous membrane surface, lower the pH, more easily cause the engraftment of gram-negative pathogenic bacteria and conditional pathogenic bacteria,then cause respiratory tract normal flora disorder.
ABSTRACT
According to the definition of WHO, food safety is a public health problem that affects the health of the human health. Food hygiene is to ensure food safety and harmless to human health, nutrition, health, and to make food be good for the body?s nor?mal needs of nutrition and health. Food hygiene can cause acute poisoning, chronic poisoning, and even carcinogenic, mutagenic effects. Therefore, we should strengthen and improve the legal system of food safety in our country to ensure food safety.
ABSTRACT
Aim To develop a new method for easy endotrache-al intubation and instillation in mice. Methods Relying on the endoscope of cold light and gel loading tips, a new method was set up for intubated operations. Under high magnification, oper-ations of endotracheal intubation and instillation were completed in mice. Twenty male CB17-SCID mice ( between 24 and 28 g) were repeatedly intubated and instilled with 80 μL suspensions of air polluted fine particulate matters in a week. Results The twenty mice were sacrificed after 24h of the last instillation. The dispersions of the air polluted fine particulate matters were found at the bottoms of tracheas and in both the left and right lungs in all mice. Conclusion Using the endoscope of cold light and gel loading tips, a new method for tracheal instillation is set up in mice, which is rapid, simple and has good repeatability. It could be widely applied for the endotracheal intubation and in-stillation in mice.