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71.
将几种旋毛虫抗原以同一浓度(0.6mg/mL)与PAPS微球交联,制成诊断试剂,进行旋毛虫阳性血清检测效果比较试验。结果显示,成虫、成虫ES、新生幼虫、肌幼虫B峰4川抗原均出现非特异性反应,而肌幼虫、肌幼虫ES、肌幼虫A峰抗原具有很高的敏感性,三者效价均达1:640。将此3种抗原所制得的诊断试剂对几种寄生虫阳性血清进行交叉试验,显示肌幼虫ES抗原对血吸虫、锥虫、弓形虫、肺吸虫、牛肝片吸虫、羊肝片吸虫阳性血清均不出现交叉反应,而肌幼虫A峰抗原、肌幼虫抗原对牛、羊肝片吸虫均出现交叉反应,对其他血清则不出现。表明肌幼虫ES抗原效果最佳,特异性最好,有很高的应用价值。 相似文献
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Padmanav Routray Chidananda Dash Surjya N Dash Seema Tripathy Dhananjay K Verma Saroj K Swain Priyabrat Swain Bhikari C Guru 《Aquaculture Research》2010,41(4):579-589
This study aimed at developing a suitable cryopreservation protocol for embryonic stem (ES)‐like cells of a tiny freshwater fish Leopard danio (Brachydanio frankei). Embryonic stem (ES)‐like cells derived from blastomeres of the early blastulae stage of the developing embryo were cultured in vitro in a medium containing Leibowitz‐15 supplemented with 10% foetal bovine serum, leopard danio embryo extract, sodium bicarbonate, sodium selenite, basic fibroblast growth factor, epidermal growth factor and leukaemia inhibitory factor. The ES‐like cells showed properties similar to ES cells in other species. They were morphologically small, round to polygonal and present in patches and extensively expressed alkaline phosphatase and stage‐specific embryonic antigen. The toxicity and chilling sensitivity of these cells were determined using ethylene glycol (EG), propylene glycol (PG) and glycerol as cryoprotective agents at molar concentrations of 0.6, 1.0, 1.4, 1.8 and 2.0. Among them, 1.8 M EG showed 70% significant viable ES‐like cells (P<0.05). The post‐thawed cells retained similar properties of non‐cryopreserved ES‐like cells with a viability rate of 65%. Similarly, blastomeres cryopreserved following the slow cooling rate with EG and PG yielded a viability of more than 70%. 相似文献
74.
小流域智能规划系统的研究与应用 总被引:2,自引:2,他引:2
该文将专家系统技术引入目标规划模型,设计、开发了基于Windows 操作平台的小流域智能规划系统,使小流域规划向动态化、智能化方向推进.以北京地区密云县石匣小流域为例,利用小流域智能规划系统进行规划.系统运行结果表明,系统设计合理,数据输入和转换方便,易于计算,功能较为完善,规划结果良好. 相似文献
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小鼠皮肤成纤维细胞的体细胞核移植 总被引:1,自引:1,他引:0
取成年小鼠唇部皮肤进行培养,分离成纤维细胞并血清饥饿培养1周,用作核供体。对成年小鼠进行超排,取卵母细胞用作核受体,核移植重构胚经SrCl2激活处理6h后,同mM16培养液和小鼠输卵管上皮细胞共培养,把发育到早期囊胚的重构胚转移至小鼠胎儿成纤维细胞饲养层上,添加ES细胞条件培养液,消化分离ICM,然后接种培养,对孵出的ES细胞样集落进行鉴定培养。结果显示,小鼠唇部皮肤成纤维细胞为核供体,核移植重构胚2-细胞率为54.05%,桑椹胚率17.14%,囊胚率6.90%,对照组卵丘细胞的核移植重构胚2-细胞率为60.00%,桑椹胚率21.85%,囊胚率11.69%,但2种供体细胞在支持核移植重构胚发育能力上差异不显著。成纤维细胞重构囊胚中6个囊胚分离出ES细胞样集落,3个ES细胞样集落可稳定传代;对照组卵丘细胞重构囊胚中9个囊胚中分离出ES细胞样集落,5个ES细胞样集落可稳定传代。从核移植重构胚中分离出的ES细胞样集落具有岛状或巢状群体生长形态,生长旺盛的集落可自发分化成单个散在或片状存在的上皮样或梭形细胞,碱性磷酸酶检测为阳性,常规冻存复苏,仍显示ES细胞特征。 相似文献
77.
Lucia Unger Vinzenz Gerber Alicja Pacholewska Tosso Leeb Vidhya Jagannathan 《Veterinary and comparative oncology》2019,17(1):107-117
Serum and whole blood microRNA (miRNA) fingerprints have been proposed as a new class of non‐invasive human cancer biomarkers. In this study, we compared equine sarcoid (ES) disease‐specific serum and whole blood miRNA fingerprints and correlated them to miRNA expression in sarcoid tissue. After high throughput sequencing, miRNA differential expression analysis between six ES‐affected and five control horses was carried out in serum and whole blood using a DESeq algorithm, accounting for the influence of hemolysis and the white blood cell count. Target gene, pathway prediction and enrichment analyses were conducted using TarBase, mirPath and GeneCodis. After exclusion of 4 hemolyzed out of a total of 11 serum samples, 9 miRNAs were found to be differentially expressed in serum of ES vs control horses. In whole blood, all 11 samples showed normal white blood cell counts and 19 miRNAs were found to be differentially expressed. A total of 2/9 serum and 7/19 whole blood differentially expressed miRNAs were also highly expressed at the tissue level and their predicted target genes were associated with cancer pathways. Serum and whole blood miRNA expression allowed discrimination between ES and control horses and merits further validation in a larger study cohort. The use of whole blood might be superior because it has higher miRNA content and is less influenced by pre‐analytical variables compared to serum. Concurrent dysregulation of single miRNAs in tissue and blood suggests a possible biological function of circulating miRNAs. 相似文献
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介绍了国内外专家系统在园艺植物方面的应用,提出了其发展过程中仍存在的问题,如知识获取的"瓶颈"问题、园艺植物专家系统性能较差、未形成成熟的园艺植物病虫害诊断知识的知识模型、未能从诊断推理思维方式出发建立园艺植物病虫害诊断知识的推理求解模型、缺乏系统应用效果的反馈、专家系统的商业性较差和农业专家系统的开发平台需要进一步研发等。展望了农业专家系统的发展趋势:利用"3S"、模型模拟、智能决策、多媒体技术等多技术的集成开发园艺植物专家系统;开发综合性农业专家系统;注重实用性,开发不同用户群体、不同层面的专家系统;利用图像识别检索等人工智能手段进行病虫害诊断。 相似文献