The microstructure of buccal cavity and alimentary canal of Siganus rivulatus: Scanning electron microscope study

The microstructure of the oral cavity and alimentary canal of herbivorous fish Siganus rivulatus collected from the Red Sea were investigated by using scanning electron microscope (SEM). The results showed that S. rivulatus has three types of teeth, tri‐cusped, bi‐cusped, and papilliform. A taste bud (Type I) was recorded in the oropharyngeal cavity. Characteristic styles of microridges on the cell's surface inside the buccal cavity were recorded. Also, the distribution of the mucous cells in the lining of the mouth cavity, alimentary canal was observed. Mucosal folds along the distinct parts of alimentary canal, showed characteristic pattern which was complex in the intestinal mucosa. The results concluded that there are characteristic microstructures according to feeding habitat compared with other bony fishes.     

氩离子激光对动物胃肠道粘膜出血的止血研究

目的 :研究氩离子激光对胃肠道粘膜出血的止血作用。结果 :氩激光对犬胃粘膜出血面的平均止血时间为 1 1 8秒 ,对犬肠道粘膜出血面的平均止血时间为 1 0 8秒。结论 :氩离子激光的止血作用显著。     

系统性淀粉样变性的超微病理诊断

目的:应用光镜(LM)及透射电镜(TEM)观察不同部位淀粉样物质的沉积及超微结构特点,为系统性淀粉样变性提供可靠的病理诊断依据.方法:对21例临床拟诊为系统性淀粉样变性病例的肾脏,腹壁脂肪和直肠粘膜活检组织按常规进行LM及TEM标本制备及病理检查.结果:LM观察显示淀粉样物质在肾脏,腹壁脂肪和直肠粘膜沉积阳性率分别为7...     

A simple affinity chromatography method for the separation of gastric proteases from mucous substances

A simple chromatographic method for separating mucous substances contained in the abomasal mucosa from proteases has been developed. The chromatographic technique used controlled porous glass as a matrix, with covalently bound keratin as a ligand. This matrix allowed affinity binding of proteases at pH 7·0. The mucous substances present in calf abomasal mucosa were easily identified in the column eluate. Proteases were eluted from the column with 0·1 ml dm^?3 HCl with good recovery (85%) and high purification.     

皮肤粘膜血管扩张性疾病的激光治疗体会

目的：报告激光对皮肤粘膜血管扩张性疾病的治疗效果。方法：选用不同激光治疗不同部位血管扩张性疾病，共计224例，男性69例，女性155例，病发部位主要位于面部、鼻中隔Litte′s区及咽粘膜。效果：治愈率可达100％。     

体外建立幽门螺秆菌感染胃粘液细胞的实验模型

建立胃粘液细胞原代培养的方法,并在此基础上观察幽门螺秆菌(Hp)对它的损伤作用。取水囊引产的胎龄5个月以上胚胎的胃粘膜,采用组织块贴壁培养的方法进行培养,用倒置显微、电镜进行形态学鉴定,并用电镜观察其与Hp共培养后形态学变化。结果细胞为多边形,呈簇状或片状生长,排列紧密,电镜下见细胞表面有微绒毛,胞浆内有丰富的粗面内质网、高尔基体及粘液分泌颗粒,细胞同有紧密连接。加入Hp后,原代培养的胃粘液细胞出现空泡变性,有部分细胞发生凋亡,其核固缩。胚胎的胃粘液细胞原代培养不失为一种体外研究Hp相关胃部疾病的较理想模型。     

Slowly decreasing mucosal hyperreactivity years after working in a school with moisture problems

In our first study in 1995, teachers, who had worked in a water-damaged school for more than 5 years, were tested for nasal histamine reactivity by rhinostereometry. They were found to have significantly increased reactivity compared with teachers in a school without these indoor-climate problems. This finding could not be explained by differences in atopy or other personal characteristics. In this 2-year follow-up study (1995-97), 26 of 28 teachers in the target school and all 18 teachers in the control school, who participated in the initial study, accepted to take part. They were tested with the same histamine provocation procedure and answered the same questionnaire as 2 years earlier. Technical measurements of temperature, relative humidity, dust, carbon dioxide, formaldehyde and total volatile organic compounds (TVOC) were carried out in both schools during the time period between the two test occasions. In this provocation test, the teachers from the repaired water-damaged school still demonstrated an increased reactivity to histamine compared with the teachers in the control school, but the difference between the growth curves of the provocation tests was less than in 1995. Teachers in the target school still complained about the indoor air quality more than their colleagues, although the complaints were less common. No major differences were observed in the technical investigation between the two schools and the measurements were all within values usually seen in schools in northern countries. Our conclusion is that the observed nasal mucosal hyperreactivity among the teachers in the renovated water-damaged school seems to persist over years and only slowly decrease even after successful remedial measures have been taken.     

卡介苗溶菌黏膜免疫调理剂对实验性免疫功能低下小鼠的免疫调节作用

目的观察卡介苗溶菌黏膜免疫调理剂(BCG-b)对实验性免疫功能低下小鼠的免疫调节作用。方法将BALB/c小鼠分为BCG-b高、中、低剂量组,每只分别隔日灌服BCG-b20、5和1U/0.2ml;阳性对照组每只隔日灌服阿胶液0.2ml,阴性对照组每只隔日灌服生理盐水0.2ml;正常对照组不给任何药物。除正常对照组外,其余各组均服药10次,并于首次服药后第14日皮下注射环磷酰胺,100mg/kg,建立免疫功能低下小鼠模型。以碳粒廓清法、血清溶血素测定法及3H-TdR掺入法分别检测各组小鼠单核-巨噬细胞吞噬功能、特异性体液免疫功能以及T淋巴细胞转化功能。结果与阴性对照组相比,BCG-b3个不同剂量组小鼠单核-巨噬细胞的吞噬功能和特异性抗体血清溶血素含量明显提高,小鼠T淋巴细胞转化功能呈双向性调节作用,即高、中剂量表现为抑制作用,低剂量表现为促进作用。结论BCG-b对实验性免疫功能低下小鼠具有明显的免疫调节作用。     

幽门螺杆菌感染后胃粘膜屏障改变的形态学研究--Ⅱ.胃粘液细胞间紧密连接的变化

目的观察HP感染后胃粘液细胞间紧密连接的变化,并探讨其临床意义. 方法 6例有HP感染(快速尿素酶试验阳性)胃粘膜窦部活检标本,采用超薄切片技术及冷冻蚀刻技术处理后,HU-12A透射电镜观察.结果 HP常聚集在胃粘液细胞连接的附近 ,甚至可沿细胞间隙向深部浸润.冷冻蚀刻复型膜观察显示:部分粘液细胞间紧密连接条索数减少,断裂或缺失,部分细胞间紧密连接条索数目增多,并向深部延伸,可游离存在或构成稀疏的网状遍布于细胞的侧面.结论 HP感染后,作为胃粘膜屏障组成部分之一的胃粘液细胞间紧密连接的破坏可能是HP致病的一个重要机制.     

The Mechanism of Lipopolysaccharide’s Effect on Secretion of Endometrial Mucins in Female Mice during Pregnancy

The main toxic component of endotoxins released from the death or dissolution of Gram-negative bacteria is lipopolysaccharide (LPS), which exists widely in the natural environment, and a large amount of endotoxin can significantly inhibit the reproductive performance of animals. A previous study showed that endotoxins mainly damaged the physiological function of mucins in the endometrium, but the mechanism is not clear. In this study, the PI3K/Akt signaling pathway was not activated, and the NF-κB signaling pathway was inhibited by LPS treatment; the expression of occludin and E-cadherin proteins were decreased and ZO-1 protein expression was increased, because LPS can lead to the mucous layer becoming thinner, so that the embryonic survival rate is significantly reduced in early pregnancy. In middle and late pregnancy, LPS translocated to the epithelial cells of the uterus and the expression of claudin-1, JAMA, and E-cadherin proteins were decreased; at this time, a large number of glycosaminoglycan particles were secreted by endometrial gland cells through the PI3K/Akt/NF-κB signaling pathway that was activated after LPS treatment, However, there was no significant difference between the survival rates of fetal mice in the LPS (+) and LPS (-) groups. Glycosaminoglycan particles and mucins are secreted by gland cells, which can protect and maintain the pregnancy in the middle and late gestational periods.