The effect of 5 store methods at 3 different temperature on ice nucleation activity of INA bacteria were evaluated. The results showed that some store methods could decrease the ice nucleation activity. The effect increased as the temperature of increased. The effect on survival and on activity is different. Different strains had different susceptibility and adaptability. It was found that the freeze-drying method storing at -20℃ and freezing in sterile distilled water storing at -20℃ could be used for most INA bacteria. Freezing in 10% glycerin could not be used for the store of INA bacteria.

The oligonucleotide primer having the 5’\|GCCGGTTATGGC AGCACGCTGACC\|3’ was synthesized,which encodes a main repetition motif of protein produced by the inaZ gene.PCR of the primer in the DNA of INA - and INA + bacteria and fungi was done.All of the DNA of INA - and INA + bacteria and fungi expressed bands,the results show that the primer did not work for distinguishing the INA - and INA + organisms and for identification of the ice nucleation activity of the INA organisms by the size and brightness of the PCR products.

Objective:To explore the correlation between serum uric acid level and atherogenic index of plama (AIP) in patients with type 2 diabetes mellitus (T2DM).Methods:A retrospective analysis of 485 T2DM patients hospitalized in the First Hospital of Qin Huangdao was performed in August 2019 to August 2021. They were divided into atherogenic phenotype group (the case group, AIP≥0.06, n=326) and non atherogenic phenotype group (the control group, AIP<0.06, n=159) with AIP=0.06 as the cut-off point. The age, sex, body mass index, uric acid, triglyceride, total cholesterol, high density lipoprotein-cholesterol, low density lipoprotein-cholesterol, glycosylated hemoglobin, smoking history and coronary heart disease history were compared between the two groups. The data processing using sample t-test and chi-square test. Pearson correlation analysis and multivariate logistic regression analysis were performed. Results:Body mass index (27.7±3.6) kg/m 2, systolic pressure (138.4±17.5) mmHg, uric acid (351.6±93.0) μmol/L, triglyceride (3.0±3.4) mmol/L and the proportion of men (61.6%(201/326)), coronary heart disease history (24.3%(79/326)) and smoking history (33.5%(109/326)) in case group were higher than those in control group (25.8±3.5) kg/m 2, (132.2±17.7) mmHg, (291.6±73.8) μmol/L, (1.0±0.3) mmol/L, (51.6%(82/159)), (15.7%(25/159)), (19.5%(31/159)) and the level of high density lipoprotein-cholesterol (1.1±0.3) mmol/L was lower than that in control group (1.3±0.3) mmol/L,with all statistically significant differences ( t=5.43, P<0.001; t=3.64, P<0.001; t=7.70, P=0.001; t=10.40, P<0.001; χ 2=4.47, P=0.034;χ 2=4.60, P=0.032;χ 2=10.11, P=0.001; t=5.18, P<0.001). The prevalence of hyperuricemia in case group (21.5%(70/326)) was 4.3 times higher than that in control group (5.0%(8/159)). AIP was positively correlated with body mass index ( r=0.300, P<0.001), uric acid ( r=0.343, P<0.001), systolic pressure ( r=0.117, P=0.010), diastolic pressure (r=0.119, P=0.009), triglyceride ( r=0.724, P<0.001), total cholesterol ( r=0.226, P<0.001), while that was negatively correlated with high density lipoprotein-cholesterol ( r=-0.185, P<0.001). Logistic regression analysis showed that after excluding the interference of other factors, uric acid was still related to AIP ( OR=3.727, 95% CI=1.702-8.158, P=0.001), and the risk of AIP increase increased with the increase of uric acid level. Conclusion:The level of serum uric acid in T2DM patients is related to AIP, and high uric acid is an independent risk factor for AIP in T2DM patients.