A comparative observation about histological and histochemical study were made onthe preservating methods of local ischemic kidney of dogs.The methods of this exp-eriment were divided into five groups:A.Local hypothermia;B.Hypothermic perfu-sion solution 500ml,4℃,containing Procaine 450 mg and Heparin 100 mg,infusedinto renal artery;C.Hypothermic perfusion solution 500ml,4℃,containing 20% Ma-nniton 32ml,25% MgSO_4 0.36 ml,Heparin 100 ml,infused into renal artery;D.Localhypothermia and heparin 30 mg injected into the same vessel.E.Local room tem-perature.The specimens were taken from the kidneys of the experimental dogs atvarious period after treated with every method.The results were as follows;A,D and E group presented irreversible histological changes within 4 hoursaftertreatment.Four hours later,the reaction of SDH,ATPase,AlPase werenegative.It suggested that the kidney damage was serious,as well as expressed thatthe effect of these preservating methods for ischemic kidney are not satisfactory.In B group,the histological and histochemical alteration is very light and almostreversible,during 60 days after treatment.In C group,hypothermic perfusionsolution containing Mannitol,MgSO_4 etc either during experiment or follow observa-tion for 60 days,no histological and histochemical alterations were found.It indica-ted that this method is an ideal perservating technique for ischemic kidney.

Objective: To investigate the epidemiological characteristics and the causes of two outbreaks of upper respiratory tract infection in our city. Methods: The epidemiological investigation was carried out on the outbreaks and the pharyngeal swabs were collected to do the pathophysiologic examination by using real-time PCR. Hexon gene of adenovirus was amplified by PCR. Then the positive products were sequenced and BLAST searching was done in GenBank. Results: The clinical symptoms of the two cases were high fever, sore throat and cough, etc, while the main signs were pharyngeal congestion and tonsil swelling; 32 students of a class in Yunxing primary school had respiratory infection related symptoms, of which the incidence rate was 55%; while 12 of 38 students in a class of Fangcun primary school were infected. All these students were on school in the same class, and the incidence was aggregate without proliferation. The duration of the disease was about 5 days and the prognosis was good, no death occurred. The positive result of real-time PCR showed adenovirus. BLAST search analysis on hexon gene showed AdV14. Conclusions According to epidemiological investigation and laboratory test results, the cause of these two outbreaks of upper respiratory tract infection was adenovirus type 14.

Objective:To detect the expression of methyl methanesulfonate and UV sensitive gene clone 81 (Mus81) in hepatocellular carcinoma(HCC) and to observe the effects of Mus81 on the migration, invasion and metastatic ability of human HCC cells.Methods:Thirty-two tissue specimens were selected from HCC tissues and corresponding paraneoplastic tissues of patients with HCC who underwent surgical resection in Guangzhou Red Cross Hospital Affiliated to Jinan University from January 2020 to June 2021. The expression levels of Mus81 in 32 HCC specimens, 374 HCC samples from the cancer genome atlas database, human normal liver cell line HL-7702 and human HCC cell lines JHH-7, Huh-7 and Hep3B were analyzed. Mus81 knockdown in JHH-7, Huh-7 and overexpressed in Hep3B HCC cell lines were constructed, and the effects of Mus81 on HCC cells were observed by scratch assay, Transwell migration and invasion assay and tail vein injection transfer assay in nude mice.Results:The expression of Mus81 was higher in HCC tissues or cell lines than which in paraneoplastic tissues or normal hepatocyte lines (all P<0.05). The migration rate, metastatic and invasive cell numbers of Mus81-knockdown Huh-7 HCC cells were 22.24%±2.16%, 49.04±5.62, 3.81±1.08, the negative control group were 26.89%±1.15%, 86.81±4.79, 19.78±3.30, and the differences between the two groups were statistically significant ( t=4.24, 26.59, 23.92, all P<0.01). The migration rate, metastatic and invasive cell numbers of Mus81-overexpressed Hep3B HCC cells were 80.57%±5.12%, 18.74±8.07, 33.81±8.44, which were significantly higher than those of the empty vector group 64.17%±7.20%, 10.96±5.32, 3.04±1.13, and the differences were statistically significant ( t=4.15, 4.18, 18.78, all P<0.01). Tail vein transfer experiments in nude mice showed that the total fluorescence expression, weight of metastatic tumors, and the metastatic rates in kidney, vertebral column, neck, axilla and subcutis in nude mice injected with Mus81-knockdown JHH-7 cells were significantly lower than those in the control group (all P<0.05). Conclusion:Mus81 gene expression is upregulated in HCC and promotes the migration, invasion and metastatic ability of HCC cells, suggesting that Mus81 may be a potential therapeutic target for HCC.