OBJECTIVE: To investigate the regulatory effects of two traditional mineral medicines (TMMs), Gypsum Fibrosum (Shigao, GF) and Terra Flava Usta (Zaoxintu, TFU), on gut-beneficial bacteria in mice, and preliminarily explore their mechanisms of action. METHODS: Mice were randomly divided into 3 groups (n=10 per group): the control group (standard diet), the GF group (diet supplemented with 2% GF), and the TFU group (diet supplemented with 2% TFU). After 4-week intervention, 16S rRNA gene sequencing was used to analyze the changes in the gut microbiota (GM). Scanning electron microscopy, in combination with coumarin A tetramethyl rhodamine conjugate and Hoechst stainings, was used to observe the bacteria and biofilm formation. RESULTS: Principal coordinate analysis revealed that GF and TFU significantly altered the GM composition in mice. Further analysis revealed that GF and TFU affected different types of gut bacteria, suggesting that different TMMs may selectively modulate specific bacterial populations. For certain bacteria, such as Faecalibaculum and Ileibacterium, both GF and TFU exhibited growth-promoting effects, implying that they may be sensitive to TMMs and that different TMMs can increase their abundance through their respective mechanisms. Notably, Lactobacillus reuteri, a widely recognized and used probiotic, was significantly enriched in the GF group. Random forest analysis identified Ileibacterium valens as a potential indicator bacterium for TMMs' impact on GM. Further mechanistic studies showed that gut bacteria formed biofilm structures on the TFU surface. CONCLUSIONS This study provides new insights into the interaction between TMMs and GM. As safe and effective natural clays, GF and TFU hold promise as potential candidates for prebiotic development.
Animals ; Gastrointestinal Microbiome/drug effects* ; Bacteria/growth & development* ; Mice ; Biofilms/drug effects* ; Male ; RNA, Ribosomal, 16S/genetics*

Objective To develop a hypoxia endurance testing system for aviation physiological training of pilots.Methods The hypoxia endurance testing system comprised a low-oxygen mixed gas generator,a pressurization system for low-oxygen mixed gas and a personal breathing apparatus.The low-oxygen mixed gas generator consisted of a main unit composed of an air compressor,a filter,a buffer tank,polymer membrane,a control module,sensors and regulators,wire cables,supporting hoses,etc.;the pressurization system for low-oxygen mixed gas was made up of a protective box,a cooling fan,a motor and a driver,a control module,a solenoid valve,a convergence block,a pressure gauge,etc.;the personal breating apparatus was composed of a gas cylinder,a pressure reducer,an oxygen supply regulator,etc.Forty-eight subjects were selected for hypoxia exposure tests to verify the effectiveness of the system.Results The system developed had the functions of low-oxygen gas preparation,pressurized filling and hypoxia experiment,and the experimental results indicated the acute hypoxia exposure by the system significantly caused signs and symptoms of hypoxia and weakened physiological functions.Conclusion The system developed gains advantages in high accuracy of gas volume fraction control,safety and remarkable effect of simulated hypoxia,and can be an effective tool for acute high-altitude hypoxia testing and training of pilots.[Chinese Medical Equipment Journal,2025,46(10):23-28]

Objective To develop a hypoxia endurance testing system for aviation physiological training of pilots.Methods The hypoxia endurance testing system comprised a low-oxygen mixed gas generator,a pressurization system for low-oxygen mixed gas and a personal breathing apparatus.The low-oxygen mixed gas generator consisted of a main unit composed of an air compressor,a filter,a buffer tank,polymer membrane,a control module,sensors and regulators,wire cables,supporting hoses,etc.;the pressurization system for low-oxygen mixed gas was made up of a protective box,a cooling fan,a motor and a driver,a control module,a solenoid valve,a convergence block,a pressure gauge,etc.;the personal breating apparatus was composed of a gas cylinder,a pressure reducer,an oxygen supply regulator,etc.Forty-eight subjects were selected for hypoxia exposure tests to verify the effectiveness of the system.Results The system developed had the functions of low-oxygen gas preparation,pressurized filling and hypoxia experiment,and the experimental results indicated the acute hypoxia exposure by the system significantly caused signs and symptoms of hypoxia and weakened physiological functions.Conclusion The system developed gains advantages in high accuracy of gas volume fraction control,safety and remarkable effect of simulated hypoxia,and can be an effective tool for acute high-altitude hypoxia testing and training of pilots.[Chinese Medical Equipment Journal,2025,46(10):23-28]

Objective To analyze the efficacy of two-hole and four-hole laparoscopic surgery in patients with sigmoid carcinoma,and to explore the influencing factors leading to complications.Methods The clinical data of 130 patients with sigmoid carcinoma who underwent laparoscopic surgery in our hospital from October 2020 to December 2022 were analyzed.The patients were divided into groups according to the surgical perforation methods.Sixty-eight patients in two-hole group were treated with two-hole laparoscopic surgery and 62 patients in four-hole group were treated with four-hole laparoscopic surgery.The perioperative indexes,visual analogue scale(VAS)scores and postoperative complications of patients in the two groups were observed and compared,and the influencing factors of complications were analyzed.Results The total incision length,first time to get out of bed,first postoperative exhaust time,postoperative hospital stay and VAS score at each time point after surgery of patients in two-hole group were significantly shorter/lower than those in four-hole group(P<0.05).There was no statistically significant difference in the incidence of complications between the two groups(P>0.05).Univariate analysis showed that there were statistically significant differences in the age,preoperative albumin,operation time,intraoperative blood loss,first time to get out of bed,first postoperative exhaust time,postoperative hospital stay,VAS scores at the 3rd day and 5th days after surgery of patients in the occurrence group and the non-occurrence group(P<0.05).Further Logistic regression analysis showed that operation time and preoperative albumin<35 g/L were the main influencing factors for the occurrence of complications(P<0.05).Conclusion Compared with four-hole laparoscopic surgery,two-hole laparoscopic surgery for patients with sigmoid carcinoma has shorter time of perioperative recovery,less postoperative pain,and no difference was found in postoperative complications between the two methods.Operation time and preoperative albumin level<35 g/L were the main influencing factors for the occurence of complications.

Objective:To investigate the effect and mechanism of Chaihu Jia Longgu Mulitang （CJLM） on hippocampal NOD-like receptor protein 3 （NLRP3）inflammasome pathway in rats with depression. Method:Sixty male SD rats were randomly divided into a normal group，a model group， a MCC950 （1 mg·kg^-1） group， and high- （13 g·kg^-1）， medium- （6.5 g·kg^-1）， and low-dose （3.25 g·kg^-1） Chaihu Jia Longgu Mulitang groups， with 10 rats in each group．The depression model was induced by isolation combined with chronic unpredictable mild stimulation（CUMS） in rats except for those in the normal group. Rats were treated correspondingly for 21 days by intraperitoneal injection in the MCC950 group and gavage in other groups. The normal group and the model group received an equal volume of normal saline. The depression-like behaviors of rats were observed by sucrose preference test （SPT） and novelty-suppressed feeding test. Enzyme-linked immunosorbent assay （ELISA） was used to determine the levels of interleukin-1β （IL-1β） and IL-18 in the hippocampus of depressed rats. Western blot was used to detect the protein levels of NLRP3， apoptosis-associated speck-like protein containing a C-terminal caspase recruitment domain （ASC）， and Caspase-1. Result:Compared with the normal group， the model group showed decreased sucrose preference rate （P<0.01）， prolonged novelty-suppressed feeding time （P<0.01）， enhanced protein expression of NLRP3，ASC， and caspase-1 （P<0.05， P<0.01）， and elevated expression of IL-1β and IL-18 （P<0.01）. Conclusion:CJLM can alleviate depression-like behaviors in CUMS-induced model rats， and the underlying mechanism is related to the inhibition of the NLRP3 inflammasome pathway．

Objective:To study the effect of Chaihu Jia Longgu Mulitang on phosphatidylinositol-3-kinases （PI3K）/protein kinase B （Akt）/glycogen synthase kinase 3β （GSK3β）/β-catenin signaling pathway of hippocampus in rats with depression. Method:A total of 120 SD rats were randomly divided into normal group，model group， and low， middle and high-dose Chaihu Jia Longgu Mulitang groups（3.25，6.5，13 g·kg^-1）， and fluoxetine group， with 20 rats in each group. Except normal group， the depression model was prepared through chronic unpredictable mild stimulation（CUMS）. The normal group and the model group were given normal saline with 6.5 g·kg^-1 by gavage. Chaihu Jia Longgu Mulitang groups were intragastrically given corresponding herbal drugs 3.75，6.5，13 g·kg^-1， while fluoxetine group was intragastrically given fluoxetine 10 mg·kg^-1 for 21 days， once a day. Then the depressive behaviors of rats were observed by sucrose preference test （SPT） and forced swimming test （FST）. Western blot was used to detect the protein expressions of PI3K，Akt，GSK3β and phosphorylation level. Result:Compared with normal group，the sucrose preference index was decreased significantly，while the immobility time in FST was increased significantly（P<0.01）， the protein expressions of PI3K， p-PI3K p110， p-PI3K p85 were decreased significantly （P<0.01）， and expressions of Akt， p-Akt Thr308，p-Akt Ser473， p-GSK3β Ser9 and β-catenin were decreased significantly（P<0.01）， while the level of GSK3β， p-GSK3β Tyr216 were increased significantly in model group（P<0.05，P<0.01）. Compared with model group，Chaihu Jia Longgu Mulitang could increase sucrose preference index and decrease the immobility time in FST（P<0.01）， the protein expressions of PI3K p110 and PI3K p85 was increased significantly （P<0.01）， levels of Akt Thr308，Akt Ser473， p-GSK3β Ser9， β-catenin were increased significantly （P<0.01）， whereas levels of GSK3β， and GSK3β Tyr216 were decreased significantly. Conclusion:Chaihu Jia Longgu Mulitang could increase protein expression and activity of PI3K in rat hippocampus， activate Akt， inhibit GSK3β kinase activity and prevent β-catenin from degradation， so as to increase PI3K/Akt pathway activity in rat hippocampus， and protect hippocampal neurons.