Microstructure and damping properties of LPSO phase dominant Mg-Ni-Y and Mg-Zn-Ni-Y alloys

This work studied the microstructure,mechanical properties and damping properties of Mg_(95.34)Ni_(2)Y_(2.66) and Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)alloys systematically.The difference in the evolution of the long-period stacked ordered(LPSO)phase in the two alloys during heat treatment was the focus.The morphology of the as-cast Mg_(95.34)Ni_(2)Y_(2.66)presented a disordered network.After heat treatment at 773 K for 2 hours,the eutectic phase was integrated into the matrix,and the LPSO phase maintained the 18R structure.As Zn partially replaced Ni,the crystal grains became rounded in the cast alloy,and lamellar LPSO phases and more solid solution atoms were contained in the matrix after heat treatment of the Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)alloy.Both Zn and the heat treatment had a significant effect on damping.Obvious dislocation internal friction peaks and grain boundary internal friction peaks were found after temperature-dependent damping of the Mg_(95.34)Ni_(2)Y_(2.66)and Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)alloys.After heat treatment,the dislocation peak was significantly increased,especially in the alloy Mg_(95.34)Ni_(2)Y_(2).66.The annealed Mg_(95.34)Ni_(2)Y_(2.66)alloy with a rod-shaped LPSO phase exhibited a good damping performance of 0.14 atε=10^(−3),which was due to the difference between the second phase and solid solution atom content.These factors also affected the dynamic modulus of the alloy.The results of this study will help in further development of high-damping magnesium alloys.

The Role and Significance of Brain-gut Peptide and Its Receptor's Expression in the Mechanism's Explanation of Cleaning Away Heat and Dampness

Cleaning away Heat and Dampness is one of the general methods in treating the syndrome of the Spleen and Stomach’s damp heat in Febrile Diseases,and its efficacy of invigorating the spleen regulating the stomach is involved in regulation of gastrointestinal motility.Many factors and systems act as the regulation,including Brain-gut peptide,which quantitative change in the gastrointestinal tissues and plasma can reflex the functions of gastrointestinal motility.So carrying on an investigation into the relation between brain-gut peptide and its receptors and gastrointestinal dyskinesia in the syndrome of damp heat in the spleen and stomach has its relevant to the explanation of the mechanism of cleaning away Heat and Dampness.

Influence of isochronal heat treatment on damping behavior of AZ61 alloy

Strain amplitude dependence of the logarithmic decrement was measured and studied on an AZ61 magnesium alloy at room temperature. Measurements were carried out before and after isochronal thermal treatment step by step with increasing temperature. For all specimens, the strain dependence of the logarithmic decrement exhibits two regions. At lower strains the logarithmic decrement is strain independent and in the higher strain region it depends strongly on strain amplitude. The strain-independent logarithmic decrement is mainly composed of thermoelastic damping and dislocation damping, which can be explained by Granato-Lticke theory. In addition, the strain-independent logarithmic decrement for the specimens annealed at higher temperatures is a little lower than that for as-cast specimen, and it increases with increasing temperature of heat treatment. Microstructure changes due to heat treatment are responsible for changes of the logarithmic decrement.

Effect of the Haoqinqingdan decoction on damp-heat syndrome in rats with influenza viral pneumonia

Objective: To investigate the effect of Chinese medicine prescription-Haoqinqingdan decoction on damp-heat syndrome in rats with influenza viral pneumonia and its influence on the immune function. Methods: A total of 48 Wistar rats were randomly divided into the normal control group, the damp-heat syndrome model group, the Haoqinqingdan decoction group (high, medium and low dose group) and the ribavirin group. The body temperature and weight of rats in each group were recorded after modeling. After treatment for 6 d, the concentration of T lymphocyte subgroup (CD3+ CD4+ , CD3+ CD8+ ) was determined by flow cytometry. The OD value of IFN毭/IL-4 was detected by double-antibody sandwich ELISA method, and its concentration was acquired through conversion. Results: After modeling, the temperature and weight of rats in each modeling group showed the increasing trend ( P<0.01). From the second day of treatment, there was significant difference in the body mass between groups, and the rat weight of the control group was higher than in the modeling group ( P<0.05 or 0.01). With the advances of treatment, only the temperature in the medium and high dose Haoqinqingdan decoction groups declined significantly ( P<0.05). After treatment, the CD4+ /CD8+ ratio of the damp-heat syndrome model group decreased more significantly compared with the control group. Elevated CD3+ CD8+ percentages and declined CD4+ /CD8+ ratios can be observed in the low dose group and ribavirin group ( P<0.05). Moreover, the CD3+ CD4+ percentage of ribavirin group was lower than in the control group ( P<0.05). After treatment, the IFN-毭 and IFN-毭/ IL-4 levels in the peripheral blood of rats in the dampheat syndrome group were obviously higher than in the control group ( P<0.05). Conclusions: Compared with ribavirin, the high dose Haoqinqingdan decoction can improve the ratio of T lymphocyte subgroup and Th1/Th2 cell balance more effectively.

Effect of different heat treatment process on damping peak of 6061Al/SiC_p MMC produced by spray codeposition

Effects of five typical heat treatment processes on the damping properties and the damping peak of 6061Al/SiC p MMC fabricated by spray codeposition were studied. The results show that the internal friction spectra of various heat treated samples exhibit the damping peak versus temperature between 130 ℃ and 200 ℃. Furthermore, the peak temperature as well as the peak height increases with increasing frequencies. By Arrhenius equation the active energy of the damping peak can be gotten, which is above 1 eV. On the other hand, different quenching treatments affect the damping peak remarkably, when the rate of cooling is above that of water quenching, the damping peak will shift to higher temperature as cooling speed is enhanced.

Application of the Homotopy Perturbation Method to Nonlinear Heat Conduction and Fractional Van der Pol Damped Nonlinear Oscillator

In this paper, a powerful analytical method, called He’s homotopy perturbation method is applied to obtaining the approximate periodic solutions for some nonlinear differential equations in mathematical physics via Van der Pol damped non-linear oscillators and heat transfer. Illustrative examples reveal that this method is very effective and convenient for solving nonlinear differential equations. Comparison of the obtained results with those of the exact solution, reveals that homotopy perturbation method leads to accurate solutions.

Analysis of treatment strategies of traditional Chinese medicine for COVID-19 in tropical regions based on the pathogens of dampness and heat

Objective:To summarize the treatment strategies of Traditional Chinese Medicine(TCM)for COVID-19 in tropical regions based on the pathogens of dampness and heat.Methods:For heat pathogen,analyzing heat in the superficies,lung and Yang Ming based on the different locations.Based on the progress of the disease,analyzing the stage of toxin and Qi deficiency induced by heat.For dampness pathogen,analyzing endogenous and external dampness based on the different locations.Analyzing dampness pathogen's special disease location—Moyuan and special symptom of dry cough with less sputum caused by sticky and stagnant characteristic of dampness.Results:The treatment strategies for heat and dampness pathogen were summarized.Conclusion:In the tropics,the pathogens of dampness and heat occur frequently and clinical treatments need to be dialectical.

Clinical effect of enriching qi, activating blood circulation, clearing away dampness and heat combined with western medicine in the treatment of idiopathic membranous nephropathy: A meta-analysis

Objective:To systemically review the efficacy and safety about the method of enriching qi,activating blood circulation,clearing away dampness and heat combined with western medicine in the therapy of patients with idiopathy membranous nephropathy(IMN).Methods:We collected the randomized controlled trials(RCTs)of enriching qi,activating blood circulation,clearing away dampness and heat for the treatment of IMN from Pub Med,The Cochrane Library,Medline,China National Knowledge Infrastructure(CNKI),China Biology Medicine disc(CBM),Wanfang Data and Wiper Databases.Bias of risk of retrieval literature was evaluated according to Cochrane Collaboration standard,and Review Manager 5.3 software was used for statistical analysis.Results:Fourteen trials(836 participants)were included in the meta-analysis.This kind of traditional Chinese method combined with western medicine in the treatment of IMN exerted statistical differences in reducing 24-hour urinary protein[WMD=-0.97,95%CI(-1.30,-0.65),Z=5.86(P<0.00001)]and elevating serum albumin[WMD=3.83,95%CI(2.10,5.57),Z=4.33,P<0.0001],lowering serum cholesterol[WMD=-0.82,95%CI(-1.08,-0.56),Z=6.18,P<0.00001],triglycerides[WMD=-0.39,95%CI(-0.67,-0.11),Z=2.77,P=0.006]and reducing the risk of adverse events[OR=0.29,95%CI[0.16,0.50],Z=4.35,P<0.0001]in the patients with IMN as compared with controls.However,there was no statistically significant difference between the method and controls when combining all trials in serum creatinine[WMD=-5.52,95%CI(-18.06,7.03),Z=0.86,P=0.39],when combining all trials in urea nitrogen[WMD=-0.90,95%CI(-2.22,0.41),Z=1.35,P=0.18].Conclusion:The method of enriching qi,activating blood circulation,clearing away dampness and heat combined with western medicine exerts certain advantages and better safety in treating patients with IMN.However,for the inferiority of the included studies,the conclusion still needs high-quality and large-sample prospective randomized controlled trials to verify.

A Review of Influencing Factors of Damping Properties of High Manganese Steel

High manganese steel has wide prospects in industry due to their excellent mechanical and damping properties. The quenching structures of high manganese steel are ε-martensite, γ-austenite and α'-martensite. Researches show that the damping properties of high manganese steel are related to these microstructures. Besides, there are many ways to improve the damping property of damping alloys. This paper reviews the damping mechanism and the influences of the ad-dition of alloying elements, heat treatment, pre-deformation and other factors on their damping performance, hoping to provide methods and ideas for the study of damping properties of high manganese steel. .

Study on the Characteristics of Gut Microbiota in Chronic Hepatitis B(CHB)Patients with Damp Heat Syndrome and Liver Depression and Spleen Deficiency Syndrome

Objective:This study was designed to explore the characteristics of gut microbiota in CHB patients with two most common traditional Chinese medicine(TCM)Syndromes—damp heat syndrome and liver depression and spleen deficiency syndrome.Methods:According to the diagnostic criteria of Western medicine,TCM and screening exclusion criteria,65 cases of CHB with damp heat syndrome and 28 cases of CHB with liver depression and spleen deficiency syndrome were finally included in the study.All the basic information was gathered and the fresh fecal samples were collected for 16S rDNA sequencing.16S rDNA of gut microbiota was sequenced using Illumina hiseq 2,500 high-throughput sequencing platform.Based on the optimized sequence,Operational Taxonomic Units(OTU)clustering analysis and taxonomic annotation were carried out.Results:The difference in relative abundance of gut microbiota was significant between damp heat syndrome and liver depression and spleen deficiency syndrome in CHB patients.Cyanobacteria was only found in damp heat syndrome.The relative abundance of Erysipelotrichia and Subdoligranulum were higher in liver depression and spleen deficiency syndrome,while the relative abundance of Rhodospirillales,Alphaproteobacteria and Lachnospira were higher in the damp heat syndrome.LDA Effect Size(LEfSe)analysis showed that Lachnospira,Olsenella and Subdoligranulum had significant difference in species among the two TCM syndromes.Conclusion:The different characteristics of gut microbiota in the two TCM syndromes of CHB patients may play an important role in syndrome formation of TCM,which provides a new field of vision for the accurate diagnosis and treatment of TCM.

Screening of Traditional Chinese Medicine Prescription for Treating Damp-heat Diarrhea of Piglets

[Objective] The paper was to explore the therapeutic effect of traditional Chinese medicine on damp-heat diarrhea of piglets in summer.[Method] Three prescriptions were developed with a dozen of traditional Chinese medicines,and in vitro antibacterial test against swine standard Escherichia coli [O149：K91,K88 ac（C83907）] was conducted.Moreover,106 natural cases of diarrhea piglets caused by coinfection of damp-heat and E.coli through clinical and laboratory diagnosis were then treated.[Result] The oral liquids prepared by three traditional Chinese medicine prescriptions had certain antibacterial effect on standard pathogenic E.coli.Prescription 2 presented the strongest inhibitory effects on swine E.coli in vitro,with the MIC of 31.25 mg/m L.It had better therapeutic effect,and the effective rate reached 94.74%.[Conclusion] The prescription 2 mainly consisted of Coptis chinensis and Prunus mume might be effective in treatment of piglet diarrhea caused by damp heat and E.coli in clinic.

新型乌蔹莓水凝胶对湿热蕴结型痛风性关节炎的干预效果

目的探讨新型乌蔹莓水凝胶对湿热蕴结型痛风性关节炎的干预效果及作用机制。方法选取90例符合痛风性关节炎西医诊断标准、中医辨证属湿热蕴结证的患者作为研究对象,随机分成治疗组、对照组和空白组,每组30例。空白组仅采用依托考昔治疗,对照组采用依托考昔联合乌蔹莓膏治疗,治疗组采用依托考昔联合外敷乌蔹莓水凝胶治疗。比较3组临床疗效、症状改善时间、安全性、舒适性和治疗前后中医证候积分、血清炎性因子[C反应蛋白(CRP)、肿瘤坏死因子-α(TNF-α)、血沉(ESR)]、NF-κB信号通路相关蛋白、疼痛视觉模拟评分法(VAS)评分、关节活动度变化情况。结果治疗组、对照组治疗总有效率分别为93.33%、90.00%,高于空白组的70.00%,差异有统计学意义(P<0.05);治疗组疼痛、红肿、压痛、关节活动受限症状改善的时间短于对照组、空白组,差异有统计学意义(P<0.05);治疗7 d后,治疗组中医证候积分低于对照组、空白组,治疗组、对照组血清CRP、TNF-α、ESR水平和NF-κB信号通路相关蛋白P50、P65表达低于空白组,差异有统计学意义(P<0.05);治疗组治疗7 d后VAS评分低于对照组、空白组,且治疗组用药舒适度评分高于对照组,差异有统计学意义(P<0.05);3组不良反应发生率比较,差异无统计学意义(P>0.05)。结论乌蔹莓水凝胶对痛风性关节炎的治疗效果优于乌蔹莓膏,其作用机制可能与调控NF-κB通路、抑制炎性因子表达有关,且水凝胶使用方便卫生,舒适性高,有望成为安全、有效、便捷的痛风性关节炎外敷中药。

基于湿热证的三仁汤研究进展

湿热证是中医临床常见证型,而湿热也是许多难治性疾病的重要病机,且其患病占比率逐年增加。三仁汤是开上、畅中、渗下的经典方剂,具有宣畅气机、清热利湿的功效,主要症状包括头痛恶寒,身重疼痛,面色淡黄,胸闷不饥等。现代临床将其广泛应用于呼吸、心血管、消化、泌尿等系统疾病,并取得了显著的效果。三仁汤能够明显改善湿热证患者的临床症状,提高生活质量,尤其对一些难治性疾病,可以延缓病情发展,延长生存期。目前基于湿热证的三仁汤作用机制主要包括抗炎、调节免疫功能,调节水通道蛋白表达,调节神经内分泌功能,调节胃肠激素水平和胃黏膜蛋白差异表达,改善糖脂代谢及能量代谢紊乱等。笔者对近年来基于湿热证的三仁汤在临床疗效和实验研究进行整合与梳理,阐述了三仁汤的理论基础、临床与机制研究,为扩展三仁汤的现代临床应用提供理论依据和参考。

王有鹏教授治疗寒地儿童荨麻疹的临证经验

王有鹏教授基于对寒地地域特点及小儿生理病理特点认识,立足临床实践,对寒地儿童荨麻疹的诊疗具有独到见解。王有鹏教授从发病邪气、脏腑、体质三个层面总结其病因病机为风邪主导,寒、热、湿邪兼杂为患;肺脾肾三脏虚损,心肝亢盛为本;同时受先天禀赋及体质因素的影响。根据寒地儿童荨麻疹发病特点将其分为风邪袭表证、湿热蕴肤证、肺脾气虚证,治疗以调和脏腑为本,祛除病邪为标,运用合方随证施治,同时兼顾调体养护,防患于未然,可取得较好疗效。

国医大师杨春波辨治脾胃湿热证胃肠病经验

杨春波教授为全国第3届国医大师,擅长运用“脾胃湿热”理论诊治胃肠系统疾患。杨老认为,脾胃湿热由内外因素共同作用而成,应从“三因制宜”角度辨识脾胃湿热证胃肠病的个体化病因病机及临床特征。针对脾胃湿热证胃肠病的辨治用药,杨老以清化湿热、调气舒络为总治则,创制“清化饮”为基本方,并结合辨析寒热、分利三焦、顾护正气、扶正防邪等辨治心得立方。作者结合杨老临床验案,阐述杨老辨治脾胃湿热证胃肠病的临证经验,以期对指导临床诊治有所裨益。

岭南地区亚健康人群睡眠状况与中医体质类型的相关性研究

【目的】探究岭南地区亚健康人群睡眠状况与中医体质类型的相关性。【方法】选取2022年5月~2023年5月于深圳市宝安区中医院治未病中心就诊的688例在深圳市居住5年以上,无严重心血管疾病,经亚健康人群评定量表评定为亚健康的人群为研究对象,采用匹兹堡睡眠质量指数(PSQI)量表、中医体质评定量表对其进行问卷调查,并将其睡眠状况与中医体质类型进行多元线性回归分析。【结果】(1)调查问卷发放回收情况:共发放688份问卷,其中,失访19份,回收669份,剔除无效问卷29份,最终共纳入有效问卷640份。(2)不同睡眠状况人群的PSQI量表评分情况:根据PSQI量表得分情况将人群分为睡眠优组(PSQI总分<8分)350例和睡眠差组(PSQI总分≥8分)290例,组间比较,睡眠优组的入睡时间、睡眠时间、睡眠障碍得分以及总分均明显低于睡眠差组(P<0.05或P<0.01)。(3)不同睡眠状况人群的中医体质类别分布情况:睡眠优者多表现为平和质(86.86%),睡眠差者多表现为偏颇体质(79.64%)。睡眠差人群中,偏颇体质排前3位的分别是湿热质(15.52%)、痰湿质(13.79%)以及气郁质(13.10%)。(4)多元线性回归分析结果显示,入睡时间与痰湿质、气郁质呈正相关(P<0.01),与平和质呈负相关(P<0.05);睡眠效率与湿热质、特禀质呈正相关(P<0.05或P<0.01),与平和质呈负相关(P<0.05);睡眠障碍与气郁质、阴虚质呈正相关(P<0.01);催眠药物与阴虚质呈正相关(P<0.01);日间功能障碍与痰湿质呈正相关(P<0.05)。【结论】岭南地区亚健康人群睡眠状况与其中医体质类型具有一定相关性,湿热质、痰湿质、气郁质、阴虚质、平和质、特禀质是影响睡眠状况主要的6种中医体质类别;结合中医体质辨识指导亚健康人群通过改善其体质从而达到未病先防的目的是很有意义的。

复方红藤糖浆联合抗菌药物治疗盆腔炎性疾病的效果

目的探讨复方红藤糖浆联合抗菌药物治疗盆腔炎性疾病(PID)患者的效果及安全性。方法选取2018年1月至2021年12月安徽中医药大学第一附属医院妇科收治入院的60例PID患者为研究对象,按随机数字表法分为研究组和对照组,各30例。2组采用盐酸头孢替安联合奥硝唑氯化钠注射液静脉输注治疗,研究组同时予复方红藤糖浆口服,2组均治疗1周。比较2组患者临床疗效、疼痛视觉模拟评分(VAS)、盆腔痛客观体征(McCormack)评分、下腹疼痛、腰骶疼痛、带下异常、乏力中医症候积分、白细胞计数(WBC)、超敏C反应蛋白(hs-CRP)、白细胞介素(IL)-10、肿瘤坏死因子(TNF)-α。结果治疗后,研究组及对照组的总有效率分别为93.33%及73.33%;研究组总有效率高于对照组,差异有统计学意义(P<0.05)。与治疗前相比较,2组治疗后VAS评分、McCormack评分、下腹疼痛积分、腰骶疼痛积分、带下异常积分、乏力积分、WBC、hs-CRP、TNF-α降低,IL-10升高(P均<0.01)。与对照组治疗后相比较,研究组治疗后VAS评分、McCormack评分、下腹疼痛积分、腰骶疼痛积分、带下异常积分、乏力积分、WBC、hs-CRP、TNF-α降低,IL-10升高(P均<0.05)。结论复方红藤糖浆联合抗菌药物可改善湿热蕴结证盆腔炎患者临床症状,疗效明显。

冬柏通淋合剂治疗慢性前列腺炎的临床观察

目的:评估冬柏通淋合剂治疗湿热下注型慢性前列腺炎(CP)的有效性。方法:选择76例湿热下注型CP患者随机分为2组,每组各38例。对照组口服前列泰片,治疗组口服冬柏通淋合剂,共治疗8周。分别在基线(治疗前)和第8周(治疗结束)后进行美国国立卫生研究院慢性前列腺炎症状评分(NIH-CPSI)和中医证候评分,并检测前列腺按摩液实验室指标。结果:治疗后两组NIH-CPSI总评分均较治疗前降低(P<0.05),且治疗组降低程度优于对照组(P<0.05)。其中,两组对排尿症状评分、疼痛和不适评分、生活质量评分均较治疗前降低(P<0.05),且治疗组改善情况均优于对照组(P<0.05)。两组前列腺中医证候评分均较治疗前显著降低(P<0.05),治疗组降低程度优于对照组(P<0.05),在改善尿不尽、少腹疼痛、会阴疼痛、阴囊潮湿方面尤为明显(P<0.05)。两组前列腺按摩液实验室指标中,白细胞(WBC)计数均较治疗前下降(P<0.05),卵磷脂小体(SPL)均较治疗前升高(P<0.05),治疗组对SPL的改善效果优于对照组(P<0.05)。治疗组总体有效率(88.89%)高于对照组(70.27%)(P<0.05)。结论:冬柏通淋合剂能有效治疗湿热下注型CP,可为临床应用提供参考。

皮肤病血毒丸治疗寻常痤疮湿热夹毒证的临床观察

目的观察皮肤病血毒丸治疗寻常痤疮湿热夹毒证的临床疗效与安全性。方法采用自身前后对照,对120例中度寻常痤疮患者给予皮肤病血毒丸单药治疗4周,疗程结束后随访4周,比较治疗前后患者皮损程度、生活质量的变化及不良反应等。结果治疗4周后,患者痤疮综合分级系统(GAGS)、皮肤病生活质量评分(DLQI)、研究者整体评估(IGA)、Cardiff痤疮伤残指数(CADI)、中医证候评分均较基线降低(P<0.001);疗程结束后随访第4周患者GAGS、DLQI、IGA、CADI、中医证候评分持续降低,相比基线差异有统计学意义(P<0.001)。研究过程中未发生不良反应。结论皮肤病血毒丸治疗寻常痤疮湿热夹毒证疗效确切,安全性较好。

鸡湿热泄泻病证模型的建立

中兽医病证模型是评价药效及研究中兽药作用机制的有效工具。为了建立鸡湿热泄泻病证模型,本研究以SPF雏鸡为试验动物,分别选取大肠杆菌CVCC1558标准株和09-29分离株,采用胸部肌内注射、口腔灌服、泄殖腔灌注3种不同方式,选择不同感染剂量,进行大肠杆菌人工感染试验,观察各组鸡临床症状,进行体温、病理剖检、十二指肠黏膜组织病理学、血细胞计数等多项检查。结果显示,采用不同的感染方法,试验鸡表现出不同的临床表现和病理变化。与空白对照组相比,口腔灌服09-29菌株试验组无任何症状出现,其他各组鸡群均表现出不同程度的病症,其中口腔灌服或泄殖腔灌注大肠杆菌CVCC1558菌株2个组试验鸡表现为排黄绿色稀粪,体温升高,剖检表现为典型卡他性或出血性肠炎变化,无心包炎、肝周炎、气囊炎病变,白细胞数增多,十二指肠黏膜肠绒毛上皮细胞脱落,无病鸡死亡,从病因、症状、病机等方面进行辨证分析,完全符合中兽医湿热泄泻的特征。采用肌内注射感染方式的3个组试验鸡虽然也出现排黄色稀粪、肠炎等湿热泄泻的表现,但发病鸡更多表现为精神极度沉郁以及心包炎、肝周炎、气囊炎等全身败血症变化,死亡率高,全身症状明显,已表现为热入营血,并不符合单纯的湿热泄泻特征。试验表明,采用SPF雏鸡每只口腔灌服大肠杆菌CVCC1558菌株3 mL,或泄殖腔灌注大肠杆菌CVCC1558菌株3 mL,均可成功构建出鸡的湿热泄泻病证模型。该方法建立的病证模型完全符合中兽医湿热泄泻证的病因、病位、病机和证候特点,临床症状明显,剖检特征典型,病程时间长,模型稳定,重复性好,适用于鸡湿热泄泻证的中兽医防治研究。