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本文利用免疫金银染色方法(IGSS)观察60例不同胎龄胸腺。结果表明:IGSS可清晰显示不同分子量的角蛋白在胸腺上皮网状细胞中的分布,此法敏感性强,背景清晰,适用于常规石蜡切片中抗原检测,可为广泛使用。 相似文献
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目的:探讨先天畸形胎儿胸腺的解剖及组织学结构特征和不同畸形与胸腺的发育关系。方法:解剖观察胸腺的形态,常规取材,苏木精———伊红染色,光学显微镜下观察胸腺组织。结果:三类、10例先天畸形胎儿中,并、缺指畸形和联体畸形胎儿胸腺的大体形态和组织学观察无明显异常,无脑畸形胎儿胸腺的大体形态和组织学观察出现明显异常。结论:不同先天畸形对胎儿胸腺发育影响不一。 相似文献
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目的探讨油橄榄叶提取物(OLE)对铅中毒小鼠胸腺的影响.方法选健康小鼠,每日灌胃醋酸铅溶液的同时灌胃不同剂量的OLE进行治疗,连续用药30d,检测胸腺指数、胸腺T细胞亚群、胸腺细胞凋亡率及胸腺细胞周期进程的变化情况.结果与模型对照组相比,小鼠灌胃OLE后胸腺指数明显升高,胸腺细胞亚群CD8标记率明显降低,胸腺细胞周期进程中G2+M期细胞百分比升高,胸腺细胞凋亡率明显降低.结论 OLE对铅中毒小鼠有一定的疗效,能抑制胸腺细胞凋亡,影响胸腺细胞周期进程,拮抗铅对胸腺的毒性. 相似文献
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为了阐明不同胎龄胸腺细胞、血胸屏障及胸腺小体的形态特点,使用光镜和电镜技术,观察了受精龄10～40周胎儿胸腺31例,对胸腺细胞早期,中期与成熟过程中超微结构特点,血胸屏障层次与特点和胸腺小体的密度和超微结构,进行观察、统计和讨论、为临床利用胎儿胸腺提供了形态学依据. 相似文献
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目前胸腺小体功能尚不明,为进一步探讨其功能提供形态学基础,我们收集了3～6个月胎儿15例,其中男8例,女7例,鲜胎速取胸腺,10％福尔马林固定,石腊包埋,连续切片,厚6微米,用HE和PAS染色,光镜观察,其结果如下: 3个月胎儿、胸腺小体偶见,园形、平均面积为0.78mm~2,多数由2～4个扁平细胞围成,核园、色浅,仁清晰,胞质弱嗜碱性,嗜酸性小体占27.5％。4个月胎儿: 相似文献
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目的:研究由金银花、黄连、甘草等组成的复方中草药制剂对青脚麻鸡胸腺显微结构、免疫功能以及凋亡相关基因Caspase-3 mRNA和蛋白表达的影响.方法:选用125羽健康28 d未接种法氏囊疫苗的青脚麻鸡,按照体重相近原则随机分对照组、攻毒组和试验Ⅰ ～ Ⅲ组,每组5个重复(每个重复5羽),对照组和攻毒组饲喂基础饲粮,试验Ⅰ ～ Ⅲ组分别添加0.5％、1.0％ 和1.5％ 的复方中草药制剂.攻毒组和试验组在30 d通过点眼人工感染IBDV,试验期为7 d.结果:与对照组相比,IBDV攻毒第3天,青脚麻鸡胸腺指数、Caspase-3 mRNA和蛋白相对表达量以及胸腺单位面积Caspase-3阳性细胞数量均显著升高(P<0.05),而胸腺皮质厚度和细胞因子(IL-2、IN F-γ)水平均显著降低(P<0.05);相比攻毒组,试验Ⅱ组青脚麻鸡胸腺指数、Caspase-3 mRNA和蛋白相对表达量均显著降低(P<0.05),而皮质厚度和IL-2含量均显著升高(P<0.05).IBDV攻毒第7天,与对照组相比,青脚麻鸡胸腺指数、Caspase-3 mRNA表达量和胸腺单位面积Caspase-3阳性细胞数显著升高(P<0.05),而胸腺皮质厚度和细胞因子(IL-2、INF-γ)水平均显著降低(P<0.05);相比攻毒组,试验Ⅱ组青脚麻鸡胸腺指数、Caspase-3 mRNA相对表达量和胸腺单位面积Caspase-3阳性细胞数均显著降低(P<0.05).显微观测发现,IBDV攻毒第3天和第7天,与对照组相比,试验Ⅱ组青脚麻鸡胸腺显微结构无明显变化,皮质和髓质结构清晰,细胞排列紧密.结论:饲粮添加1.0％ 复方中草药制剂对IBDV感染青脚麻鸡胸腺显微结构有明显改善作用,并能提高胸腺免疫,抑制胸腺淋巴细胞凋亡,减轻IBDV对青脚麻鸡胸腺的损伤. 相似文献
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试验研究了中草药提取物"益绿素"对鸡免疫器官发育的影响。选用160只1日龄健康雏鸡随机分为试验组和对照组,中草药提取物"益绿素"分别按0%和0.2%添加到对照组和试验组鸡的基础日粮中,试验期30d。试验结束时从各组随机抽取30只鸡进行屠宰,采集鸡的胸腺、脾脏和法氏囊等样本。应用组织学方法制作组织切片,显微观察中草药提取物"益绿素"对鸡免疫器官发育的影响。结果表明对照组鸡的胸腺皮质较试验组薄,胸腺小体较试验组多,淋巴细胞排列较为疏松;试验组鸡脾脏红髓和白髓界限清晰,脾小体明显,动脉周围淋巴鞘厚,对照组鸡脾小体少且小动脉周围淋巴鞘较薄,淋巴细胞排列较疏松;对照组鸡法氏,囊皱襞缩小,并有退化萎缩现象;试验组鸡法氏囊皱襞较宽,法氏囊小结较大。中草药提取物"益绿素"作为饲料添加剂对鸡免疫器官的发育有明显的促进作用。 相似文献
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The heterogeneous UV/Fenton process with the appropriate amount of Fe-Mn-Cu-Y as catalyst was developed and various operation conditions for the degradation of phenol were evaluated. The results indicated that by using the heterogeneous UV/Fenton process, the CODcr removal rate reached almost 100% for wastewater containing phenol. Compared with the homogeneous process, the developed catalyst could be used at wider pH range in the UV/Fenton process. Comparison of various heterogeneous process showed that heterogeneous UV/Fenton process was best. The heterogeneous UV/Fenton process with Fe-Mn-Cu-Y catalyst is highly efficient in degrading various organic pollutants. 相似文献
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INTRODUCTION For the degradation of high concentration wast- ewater with toxic and non-biodegradable pollutants, the UV/Fenton method has been proposed in recent years (Braun et al., 1991; Bossmann et al., 1998). The UV/Fenton system relies mainly on oxidative degradation reactions, where organic radicals are generated by photolysis of the organic substrate or by reaction with hydroxyl radicals. These radical intermediates are subsequently trapped by dissolved molecular oxygen and lea… 相似文献
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明确农村消费的地区及结构差异是制定刺激农村消费有关政策的实证基础。结合云南省地域特点,针对云南省各州市农村居民消费进行区域分析和数学建模,运用K均值聚类分析、主成分分析及回归分析,以了解云南省各州市农村居民的消费构成和习惯。结果表明,云南省2010年各州市农村居民消费构成差异较大,消费结构不合理;K均值聚类分析显示云南省各州市农民消费情况可划分为三类,每类之间存在较大差异;AIC准则表明主成分回归模型比全模型更优,解释了变量90.6%的信息,模型通过了显著性检验。主成分回归的结果显示农村居民消费与收入存在显著相关性。 相似文献
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Pavlina Hadjitheodoulou-Loizidou Marianna Fokaidou Stelios Papamarkou 《Education 3-13》2013,41(5):532-546
The project My house of value was implemented at a fourth grade primary school classroom for 10-year-old students in Nicosia, Cyprus. The main goal of the project was to examine how pupils realise identity and diversity in their broad sense, how they deal with stereotypical thoughts and how they understand interaction in both positive and negative ways. This was achieved through certain activities during the art lesson, which gave them the opportunity to express themselves in various ways. The method included observation and discussion in classroom, analysis of teachers' diaries and students' works and interviews with students reflecting on the various activities of the project. The final results showed that many pupils could realise that the diversities between identities are more than similarities, but this fact was not necessarily negative. They also became aware of stereotypical thinking concerning the self and the other. They also realised the complication of human intercultural encounters since emotions and experiences are involved. Finally, they concluded that the different ways of knowing the other include different means of communication. The implementation of the project showed that such activities can have a positive impact on pupils especially if they are incorporated in everyday curriculum and classroom practice. 相似文献
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Much of the research in higher education has treated student bodies as homogeneous groups with a consequent neglect of any consideration of gender differences. To test the validity of such research a questionnaire was administered to 255 psychology students. The results showed some important differences in responses between the genders. In particular, the female students reported attaching more importance than males to pre‐course aims, rated various learning activities as more valuable and interesting than males and reported more improvement in nine of the 12 skills surveyed than the males. The males rated experiencing less difficulty for various aspects of the course than anticipated than did the females for 11 of 12 potential difficulties listed. As a consequence, it is suggested that researchers ought to be wary of conducting research into various aspects of higher education without considering potential gender differences. 相似文献
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民初河南组党热潮的出现,集中反映出辛亥革命后河南政治生活的活跃和各阶层人民参加政治生活、改善自己的政治和经济地位的要求。民初河南组党热潮的出现,具有区域性特征,同时也是全国组党热潮运行轨迹的一个缩影。从中可以折射出民初河南乃至全国社会政治发展演变的历史脉络。 相似文献
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人的应激生活事件与其心理健康状况关系密切,本文对高师贫困生的应激生活事件进行了调查.结果表明:前10位的应激生活事件主要来自个人因素、学习与就业因素、学校因素和社会因素等方面.不同的应激生活事件的影响在不同年级和不同性别的高师贫困生中体现出差异.提出了化解应激生活事件对高师贫困生影响的对策. 相似文献
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This paper examines how early career teachers cope with or manage the challenges that they experience during the transition from pre-service to the first and then the second year of teaching as they seek to establish stable, positive, professional identities and teach effectively in various school and policy contexts. Findings from three waves of interviews conducted with six elementary and secondary school teachers showed that, for these teachers in the early years of teaching, the construction of positive or negative, stable or unstable professional identities was closely related to whether they coped with or managed various tensions and to their perceived effectiveness. The findings also revealed that their ability to cope or manage was not only influenced by the relative strength of commitment with which they entered teaching, but also by the kinds of school-level support which they experienced. 相似文献