金鱼对5种因子的耐受性研究

在自来水养殖中,研究了半致死浓度(LC50)和耐受浓度(MDT)对金鱼生长和发育的影响.结果表明,金鱼对总磷、总氮、PH值(酸碱度)、铁离子、漂白粉的耐受浓度分别为:46.08mg/L、17.16 mg/L、6.14～8.81、1.75 mg/L、1.42 mg/L,其耐受性顺序为:总磷<总氮<铁离子<漂白粉<PH值(酸碱度).

Effect of moxibustion combined with acupoint application on enteral nutrition tolerance in patients with severe acute pancreatitis

Objective: To explore and analyze the effect of moxibustion combined with acupoint application on enteral nutrition tolerance, nutritional status and comfort in patients with severe acute pancreatitis. Methods: Ninety-six patients who were hospitalized in a third-grade class-A general hospital in Tianjin were selected and divided into three groups: A, B, and C, each with 32 cases. Group A uses usual treatment and care methods, group B implements acupoint application treatment, group C was treated with moxibustion on the basis of acupoint application. Intervention time is from the first day of the enteral nutrition to the 7th day, the tolerance of enteral nutrition in patients 7 days during the intervention and the level of serum albumin and pre-protein in the nutritional indicators of patients on day 3 of intervention and intervention on day 7, as well as the comfort level of the patients on the 7th day of intervention were observed and recorded. Results:(1) The difference in the incidence of enteral nutrition intolerance among the three groups was significantly statistical (P < 0.05). The incidence of enteral nutrition intolerance in group C was lower than that in group B (P < 0.05) and group A (P < 0.05). There was no significant difference between group B and group C (P > 0.05).(2) Nutritional index levels of three groups of patients, on the third day of intervention, the serum albumin and serum pre-protein were significantly statistical (P < 0.05). Comparing the two groups, the serum albumin level in group A was significantly different from that in group B (P < 0.05). There was significant difference between group A and group C (P < 0.05). There was no significant difference between the group and the group C (P > 0.05). On the 7th day of intervention, the difference between group A and group B was statistically significant (P < 0.05). There was a statistically significant difference between group A and group C (P < 0.05), group B and group C (P < 0.05). Pre-protein levels in three groups, there was a significantly statistical difference between intervention days 3 and 7 (P < 0.05), further comparison was made between the two groups. On the third day of intervention, there were significant differences between group A and group B, group A and group C, group B and group C (P < 0.05). On the 7th day of intervention, there were significant differences between group A and group B, group A and group C, group B and group C (P < 0.05).(3) On the 7th day of intervention, the comfort level of the three groups was significantly different (P < 0.05). Further comparison between the two groups was made. The comfort score of group C was higher than that of group B and group A (P < 0.05), and the score of group B was higher than group A (P < 0.05). Conclusion: Moxibustion combined with acupoint application can effectively improve the tolerance level of enteral nutrition and improve the nutritional status of patients and increase patient comfort.

Total body irradiation of donors can alter the course of tolerance and induce acute rejection in a spontaneous tolerance rat liver transplantation model

Liver transplantation is an established therapy for end-stage liver diseases. Graft rejection occurs unless the recipient receives immunosuppression after transplantation. This study aimed to explore the mechanism of acute rejection of liver allografts in rats pre-treated with total body irradiation to eliminate passenger lymphocytes and to define the role of CD4＋CD25＋ regulatory T cells in the induction of immunotolerance in the recipient. Male Lewis rats were used as donors and male DA rats were re- cipients. Rats were randomly assigned to the following four groups： control group, homogeneity liver transplantation group, idio-immunotolerance group and acute rejection group. After transplantation, the survival time of each group, serum alanine aminotransferase, total bilirubin levels, number of Foxp3＋CD4＋CD25＋ regulatory T cells, expression of glucocorticoid-induced tumor necrosis factor receptor on T cell subgroups, histopathology of the hepatic graft and spleen cytotoxic T lymphocyte lytic activity were measured. In the acute rejection group, where donors were preconditioned with total body in＇adiation before liver transplantation, all recipients died between day 17 and day 21. On day 14, serum alanine aminotransferase increased signifi- cantly to （459.2±76.9） U L^- 1, total bilirubin increased to （124.1±33.7） μmol L-1 （P〈0.05） and the ratio of Foxp3＋CD4＋CD25＋ regulatory T cells decreased significantly to 1.50%±0.50% （P〈0.05） compared with the other groups. Analysis of the T cell subpopulations in the acute rejection group varied from the other groups. Histological analysis showed typical changes of acute rejection in the acute rejection group only. Preconditioning of the donors with total body irradiation eliminated passenger lymphocytes of the liver graft, and thus affected the course of tolerance and induced acute rejection after liver transplantation.