共查询到18条相似文献,搜索用时 31 毫秒
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通过对蛤蚧与中国石龙子顶盖细胞形态及细胞在顶盖不同层次间的比较,研究两种不同习性动物视觉结构之间的差异.用尼氏(Nissl)染色法进行顶盖组织染色,辣根过氧化物酶(horseradish peroxidase,HRP)进行顶盖注射,测量和记录顶盖细胞的面积、形态及树突走向并作统计分析.结果显示两种动物顶盖层次间的投射方式及细胞在各层次的比较存在相似之处,而中国石龙子顶盖C层细胞面积显著大于蛤蚧,其S层细胞树突分枝比蛤蚧的要广泛,而且这两种动物不同大小和不同形态顶盖细胞所占比例在顶盖内部三层间也存在差别.这些结果表明夜行性蛤蚧和昼行性中国石龙子的视觉系统中,其顶盖结构存在差异. 相似文献
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本实验把辣根过氧化物酶(HRP)注射到蟾蜍舌下神经核背内侧核(dorsomedialn.XII,DMN)和视顶盖(OT),利用逆行和顺行标记技术,研究了控制舌肌运动神经元活动的视顶盖神经元的分布和形态。结果表明,视顶盖神经元直接控制舌肌运动神经元,它们主要分布在视顶盖的腹外侧部。这些神经元在形态上可分为三大类:梨形神经元、锥形神经元和神经节神经元,与Golgi浸染法描述的两栖类视顶盖细胞类型相似。这表明视顶盖虽有功能分区,但很难在细胞形态与其生理性质之间建立联系。 相似文献
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本研究发现,蛤蚧视觉神经核团有视顶盖(OT)、峡核(NI)、基底视束核(nBOR)、豆状核(LM)、中脑深部核(NPM)、圆核(NR)、前背侧室嵴(ADVR)和皮质加厚区(Pth)等,其中NI和ADVR两核团的体积最大。视觉核团中有各种形状的细胞形态,其中梨形和梭形细胞占的比例较大。神经核团的细胞直径为6~30μm,其中以15~28μm最多。在ADVR和Pth核团中有细胞丛簇存在,其它核团尚未发现有这样的结构。各神经核团问和核团内有广泛而复杂的纤维联系。蛤蚧有关视觉神经核团除具有视觉功能外,可能还与听觉、触觉、嗅觉和平衡感觉等功能有关。 相似文献
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研究了-氨基丁酸(GABA)及其拮抗剂荷包牡丹碱和2-hydroxysaclofen对家鸽中脑扁豆核神经元视觉反应的影响. 结果指出, GABA能明显减小扁豆核神经元的自发活动和视觉反应, 其GABAA拮抗剂荷包牡丹碱则能增强视觉反应, 并可消除无效方向上的抑制性反应, 但GABAB拮抗剂2-hydroxysaclofen对视觉反应和抑制反应均无效. 由此可见, 家鸽中脑扁豆核方向敏感神经元无效方向上的抑制主要由GABA和GABAA受体介导. 这种抑制作用至少部分是视动震颤方向不对称性的基础. 相似文献
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为了研究Wilson病(wilson disease,WD)基因突变的类型和发生情况,探讨WD疾病的病因、临床特点,通过采用变性高效液相色谱(denaturing high performance liquid chromatography,DHPLC)方法结合DNA测序方法对13例无亲缘关系的患者及33住亲属进行A TP7B基因所有外显子及5'端非转录区突变检测.33例DNA标本确认11种基因突变,其中包括9种错义突变(p.R778L、p.R919G、p.T1178A、p.T977M、p.K1010Q、p.C490TERM、p.A874P、p.G943S、p.G943D),1种缺失突变(2790delCAT),1种剪切位点改变(c.1708-1G>C (intron 4 +1 G>C)).在13个家系中,发现4例R778L突变,2例2790delCAT,均为杂合型突变,涉及17个等位基因,本组检出率为70.8%(17/24).DHPLC-测序法是WD疾病基因突变筛查较为快捷、全面而且敏感的方法.WD基因突变存在热点区分别为3、8、12号外显子.2790delCAT、p.K1010Q、c.1708-1G>C (intron 4+1 G>C)是ATP7B基因新突变类型,p.S406A、p.V456L、p.V 1140A、p.R952K是中国人比较常见的多态类型. 相似文献
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大鼠下丘脑室旁核与终纹床核及前额叶皮质间纤维联系的研究 总被引:2,自引:0,他引:2
分别注射辣根过氧化物酶(HRP)入大鼠的PVN和BNST,用组织化学的方法在确定注射部位准确的情况下,在PVN、BNST及PFC观察被标记的神经元或轴突末梢,探讨大鼠下丘脑室旁核(PVN)与终纹床核(BNST)及前额叶皮质间(PFC)之间是否存在投射通路;将HRP注射到PVN后,在同侧的BNST见标记的细胞体,在PFC未见标记的细胞体或轴突末梢;将HRP注射到BNST后,在同侧的PVN见标记的轴突末梢,在PFC未见标记的细胞体或轴突末梢。大鼠BNST有神经纤维投射到PVN,PFC与PVN及BNST之间没有直接的或只有极少量的纤维联系,在机体面临威胁性情境时,BNST可能激活HPA轴引发生理和行为反应,PFC是否通过与PVN或BNST的直接或间接的纤维投射实现其调节功能值得关注。 相似文献
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本研究旨在利用生物信息学方法构建经铜诱导的ATP7B基因敲除HepG2细胞系的转录调控网络。探讨关键转录因子在肝豆状核变性发生、发展中的潜在作用机制。收集公共基因表达数据库(gene expression omnibus, GEO)中包含野生型、ATP7B基因敲除型、铜诱导的野生型和铜诱导的ATP7B基因敲除型HepG2细胞系数据。筛选由铜诱导产生的差异表达基因(differentially expressed genes,DEGs)后进行基因本体论(gene ontology,GO)、京都基因和基因组百科全书(Kyoto encyclopedia of genes and genomes, KEGG)富集分析。基于蛋白相互作用网络,识别疾病关键基因和功能模块,并对关键功能模块中的基因进行富集分析。最后,构建转录调控网络,筛选核心转录因子。共筛选出1 034个差异表达基因,其中上调525个,下调509个。上、下调关键功能模块分别包括了3785个和3931个基因。关键功能模块中的基因主要定位于细胞-基质连接、染色体、剪接复合体、核糖体等区域,共同参与了mRNA加工、组蛋白修饰、RNA剪切... 相似文献
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应用生化方法分离了棘尾虫细胞大核的核基质与核周层。电镜观察表明,分离的核基质与核周层结构都能保持大核的原有形态,它们是由纤维颗粒状的物质所组成。生化分析表明,大核核基质与核周层主要由蛋白质所组成,少量抗抽提的DNA和RNA主要是结合在核内基质结构上。 相似文献
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对39个家系45个病人及60例正常人的ATP7B基因的几个外显子采用8~10%的非变性丙稀酰胺胶进行SSCP分析, 并对异常者测序(放射自显影), 发现一个家系的8号外显子上同时存在两个突变(C2250G和G2273T),患者属纯合子,其父为杂合子,母亲和妹妹为正常, 类似“杂合丢失现象”。提示在除了肿瘤之外的体细胞遗传病中,二次突变理论也可能是突变发生的机制之一。Abstract: Screen for mutation in many exons with 45 Wilson disease patients in 39 Chinese families by SSCP and nucleotide sequence analysis by autoradiograph. There are two mutations in exon 8 of a patients family: C2250G and G2273T. Found in these two mutation points, the patients father is a heterozygote, patients mother and sister are normal sequences, and patient is a homozygous. It just like a loss of heterogyzosity in this family with Wilson disease. The patient and her parent sibship were confirmed by taternity test with microsatellite vWF SE33 AR and D9S112. The result suggested that Loss of heterozygosity (LOH) is probable mutate mechanism of hereditary disease besides tumor and cancer. 相似文献
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The present study describes the effects of gamma-aminobutyric acid (GABA) and itsantagonists, bicuculline and 2-hydroxysaclofen, on visual responses of neurons in the pigeon nucleuslentiformis mesencephali (nLM). The results indicate that GABA significantly reduces bothspontaneous activity and visual responsiveness, and GABAA antagonist bicuculline but not GABABantagonist 2-hydroxysaclofen enhances visual responses of nLM cells examined. Furthermore,inhibition produced by motion in the null-direction of pretectal neurons is diminished by bicucullinebut not by 2-hydroxysaclofen. It is therefore concluded that the null-direction inhibition of directionalcells in the pigeon nLM is predominantly mediated by GABA and GABAA receptors. This inhibitionmay at least in part underlie directional asymmetry of optokinetic responses. 相似文献
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The present study describes the effects of gamma-aminobutyric acid (GABA) and its antagonists, bicuculline and 2-hydroxysaclofen, on visual responses of neurons in the pigeon nucleus lentiformis mesencephali (nLM). The results indicate that GABA significantly reduces both spontaneous activity and visual responsiveness, and GABAA antagonist bicuculline but not GABAB antagonist 2-hydroxysaclofen enhances visual responses of nLM cells examined. Furthermore, inhibition produced by motion in the null-direction of pretectal neurons is diminished by bicuculline but not by 2-hydroxysaclofen. It is therefore concluded that the null-direction inhibition of directional cells in the pigeon nLM is predominantly mediated by GABA and GABAA receptors. This inhibition may at least in part underlie directional asymmetry of optokinetic responses. 相似文献
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The present study describes the effects of gamma-aminobutyric acid (GABA) and its antagonists, bicuculline and 2-hydroxysaclofen, on visual responses of neurons in the pigeon nucleus lentiformis mesencephali (nLM). The results indicate that GABA significantly reduces both spontaneous activity and visual responsiveness, and GABAA antagonist bicuculline but not GABAB antagonist 2-hydroxysaclofen enhances visual responses of nLM cells examined. Furthermore, inhibition produced by motion in the null-direction of pretectal neurons is diminished by bicuculline but not by 2-hydroxysaclofen. It is therefore concluded that the null-direction inhibition of directional cells in the pigeon nLM is predominantly mediated by GABA and GABAA receptors. This inhibition may at least in part underlie directional asymmetry of optokinetic responses. 相似文献
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Juan D. Daza Aurelia A. Mapps Patrick J. Lewis Monte L. Thies Aaron M. Bauer 《Journal of morphology》2015,276(8):915-928
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Gekko swinhonis is a gekkonid lizard endemic to China, inhabiting Loess Plateau, Huabei Plain, Huanghuai Plain and areas north of the Yangtze River. We characterized 21 dinucleotide microsatellite loci from an AC/AG‐enriched genomic library of G. swinhonis. The number of alleles per locus ranged from eight to 24 and the observed and expected heterozygosities ranged from 0.160 to 0.834 and from 0.584 to 0.917, respectively. We also tested the utility of these loci in other Gekko and Hemidactylus species; many of these loci can be cross‐amplified. 相似文献