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目的研究荜拨(piperlongumine,PL)体外抗新孢子虫的作用。方法通过细胞毒性试验确定PL对Vero细胞增殖率完全无影响的安全浓度,用安全浓度的PL处理Vero细胞,检测PL对细胞内新孢子虫增殖、细胞感染率以及虫体超微结构的影响。结果处理24和48 h,PL浓度为0. 6和1. 25μg/mL对Vero细胞活力均无影响;PL呈剂量依赖性抑制Vero细胞内新孢子虫增殖,非剂量依赖性降低Vero细胞的感染率,可显著损伤新孢子虫的正常形态结构,使虫体胞质水肿,大量空泡产生,类锥体与棒状体丢失,虫体崩解。结论 PL能显著抑制细胞内新孢子虫的增殖,降低虫体感染Vero细胞的能力,损伤虫体的超微结构,发挥较好的抗新孢子虫作用,在治疗新孢子虫病方面具有潜在的药用价值。 相似文献
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目的建立检测鹿新孢子虫感染的双抗夹心Dot-ELISA方法,并进行初步应用。方法以双抗夹心ELISA方法的A490值对应Dot-ELISA方法显色结果的方式,建立双抗夹心Dot-ELISA方法检测结果判定标准,确定HRP标记的抗犬新孢子虫MIC6单克隆抗体1H11、包被抗体(抗犬新孢子虫MIC6单克隆抗体1A1)、待测血清的最佳工作浓度,并对该方法的特异性、重复性及灵敏度进行验证。用建立的方法检测79份鹿血清,并与双抗夹心ELISA方法进行比较。结果确定该方法 HRP-H11抗体的最佳稀释度为1∶100,包被抗体最适工作浓度为0.3μg/片,待测血清稀释度为1∶8。自然感染犬新孢子虫的鹿阳性血清的敏感性稀释度为1∶64,与弓形虫阳性血清无交叉反应,敏感性、特异性较强;自然感染新孢子虫的鹿阳性血清3次检测结果重复性较好。该方法检测的76份鹿血清中,阳性12份,阳性率为15.2%,与双抗夹心ELISA方法检测结果一致。结论建立的双抗夹心Dot-ELISA方法可用于检测鹿群感染新孢子虫循环抗原,为新孢子虫病的诊断提供了新的方法。 相似文献
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Joachim Müller Nicoleta Anghel Dennis Imhof Kai Hnggeli Anne-Christine Uldry Sophie Braga-Lagache Manfred Heller Kayode K. Ojo Luis-Miguel Ortega-Mora Wesley C. Van Voorhis Andrew Hemphill 《International journal of molecular sciences》2022,23(4)
Neospora caninum is an apicomplexan parasite closely related to Toxoplasma gondii, and causes abortions, stillbirths and/or fetal malformations in livestock. Target-based drug development has led to the synthesis of calcium-dependent protein kinase 1 inhibitors, collectively named bumped kinase inhibitors (BKIs). Previous studies have shown that several BKIs have excellent efficacy against neosporosis in vitro and in vivo. However, several members of this class of compounds impair fertility in pregnant mouse models and cause embryonic malformation in a zebrafish (Danio rerio) model. Similar to the first-generation antiprotozoal drug quinine, some BKIs have a quinoline core structure. To identify common targets in both organisms, we performed differential affinity chromatography with cell-free extracts from N. caninum tachyzoites and D. rerio embryos using the 5-aminopyrazole-4-carboxamide (AC) compound BKI-1748 and quinine columns coupled to epoxy-activated sepharose followed by mass spectrometry. BKI-binding proteins of interest were identified in eluates from columns coupled to BKI-1748, or in eluates from BKI-1748 as well as quinine columns. In N. caninum, 12 proteins were bound specifically to BKI-1748 alone, and 105 proteins, including NcCDPK1, were bound to both BKI-1748 and quinine. For D. rerio, the corresponding numbers were 13 and 98 binding proteins, respectively. In both organisms, a majority of BKI-1748 binding proteins was involved in RNA binding and modification, in particular, splicing. Moreover, both datasets contained proteins involved in DNA binding or modification and key steps of intermediate metabolism. These results suggest that BKI-1748 interacts with not only specific targets in apicomplexans, such as CDPK1, but also with targets in other eukaryotes, which are involved in common, essential pathways. 相似文献
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利用XRD和化学分析方法研究了Ca5(PO4)3F的稳定性和石灰石中的Ca5(PO4)3F对C3S和C2S形成过程的影响.结果表明,Ca5(PO4)3F在1450℃下能稳定存在,1450℃时SiO2和C2S能使Ca5(PO4)3F分解;用含磷石灰石制备C2S和C3S时,1100℃和1200℃煅烧时生成β-C2S,1300 ℃煅烧时Ca5(PO4)3F分解形成的PO;-与β-C2S生成α:C2 S-xC3P,β-C2S与CaO生成C3S.在1450℃保温4h,用含磷石灰石制备的C2S全部转换为α:C2S-xC3P的固溶体.当煅烧温度由1100℃逐渐升至1450℃时,含磷石灰石中的氟随着煅烧温度的升高逐渐减少,Ca5(PO4)3F随着煅烧温度的升高逐渐分解,含磷石灰石-SiO2体系(C/S =2:1)和含磷石灰石-SiO2体系(C/s=3:1)在1450 ℃煅烧0.5h后Ca5(PO4)3F分别分解了94.00%和81.25%. 相似文献
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目的构建丙型肝炎病毒(HCV)NS5B-FL、NS5B-C21和NS5B-C51重组原核表达载体,并进行目的蛋白的表达及鉴定。方法利用PCR技术扩增3种长度的NS5B基因,经BamHI和XhoI双酶切后连接到经同样酶切的原核表达载体pET-28a(+)上,转化大肠杆菌BL21(DE3),IPTG诱导表达重组蛋白,并进行纯化及鉴定。结果所构建的3种重组质粒pET-28a(+)-NS5B-FL、pET-28a(+)-NS5B-C21和pET-28a(+)-NS5B-C51,转化大肠杆菌BL21(DE3)后,经PCR及酶切鉴定,均能扩增或酶切出相应大小的目的基因片段,表达的6His-NS5B-FL融合蛋白主要以包涵体形式存在,而表达的6His-NS5B-C21和6His-NS5B-C51融合蛋白的可溶性明显增加。纯化的6His-NS5B-C21蛋白未发生降解,6His-NS5B-FL和6His-NS5B-C51蛋白发生了部分降解。纯化后的3种蛋白均能与丙肝患者血清发生反应。结论已成功构建了3种NS5B基因的重组表达载体,并获得了目的蛋白表达,为进一步抗HCV药物的筛选奠定基础。 相似文献
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本文报导含类立方烷型簇核Fe4s4的金硫配位化合物[(C2H5)4N]2{Fe4S4[S2CN(C2H5)2]4}的合成、晶体和分子结构测定的结果。 相似文献
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Zhen-Shan Yang Hai-Yang Pan Wen-Wen Shi Si-Ting Chen Ying Wang Meng-Yuan Li Hai-Yi Zhang Chen Yang Ai-Xia Liu Zeng-Ming Yang 《International journal of molecular sciences》2022,23(1)
Decidualization is essential to the establishment of pregnancy in rodents and primates. Laminin A5 (encoding by Laminin α5) is a member of the laminin family, which is mainly expressed in the basement membranes. Although laminins regulate cellular phenotype maintenance, adhesion, migration, growth, and differentiation, the expression, function, and regulation of laminin A5 during early pregnancy are still unknown. Therefore, we investigated the expression and role of laminin A5 during mouse and human decidualization. Laminin A5 is highly expressed in mouse decidua and artificially induced deciduoma. Laminin A5 is significantly increased under in vitro decidualization. Laminin A5 knockdown significantly inhibits the expression of Prl8a2, a marker for mouse decidualization. Progesterone stimulates the expression of laminin A5 in ovariectomized mouse uterus and cultured mouse stromal cells. We also show that progesterone regulates laminin A5 through the PKA-CREB-C/EBPβ pathway. Laminin A5 is also highly expressed in human pregnant decidua and cultured human endometrial stromal cells during in vitro decidualization. Laminin A5 knockdown by siRNA inhibits human in vitro decidualization. Collectively, our study reveals that laminin A5 may play a pivotal role during mouse and human decidualization via the PKA-CREB-C/EBPβ pathway. 相似文献
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通过对影响T203产品的多因素分析,摸索出了在工业化中制备的最佳条件为:(1)制酸阶段:P2S5选用硫磷比A1~A2左右的,辛醇与P2S5的摩尔比为C2∶1,加辛醇温度为85℃,反应温度为95℃,反应时间为D2×2h;(2)皂化成盐阶段:ZnO过量E3%,ZnO加料温度为F3℃,反应温度为90℃,反应时间为3h;(3)过滤助滤剂B3型。采用优选条件后,提高了产品质量,降低了生产成本,并解决了困扰多年的生产过滤难的问题。 相似文献
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关于开发碳四、碳五馏分生产丙烯技术方案的探讨 总被引:8,自引:0,他引:8
利用蒸汽裂解和炼油工艺的碳四和碳五馏分生产丙烯是增产丙烯的一条重要途径。介绍了国外几种主要的技术以及我国在此领域研究的最新成果。认为在原来以重质石油组分生产轻烯烃的基础上,可以开发出我国自己的技术。 相似文献
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Hao Li Maolan Yue Leiyu Jiang Yongqiang Liu Nating Zhang Xiaoling Liu Yuyun Ye Ximeng Lin Yunting Zhang Yuanxiu Lin Mengyao Li Yan Wang Yong Zhang Ya Luo Xiaorong Wang Qing Chen Haoru Tang 《International journal of molecular sciences》2022,23(21)
C2H2-type zinc finger proteins (C2H2-ZFPs) play a key role in various plant biological processes and responses to environmental stresses. In Arabidopsis thaliana, C2H2-ZFP members with two zinc finger domains have been well-characterized in response to abiotic stresses. To date, the functions of these genes in strawberries are still uncharacterized. Here, 126 C2H2-ZFPs in cultivated strawberry were firstly identified using the recently sequenced Fragaria × ananassa genome. Among these C2H2-ZFPs, 46 members containing two zinc finger domains in cultivated strawberry were further identified as the C1-2i subclass. These genes were unevenly distributed on 21 chromosomes and classified into five groups according to the phylogenetic relationship, with similar physicochemical properties and motif compositions in the same group. Analyses of conserved domains and gene structures indicated the evolutionary conservation of the C1-2i subclass. A Ka/Ks analysis indicated that the C1-2i members were subjected to purifying selection during evolution. Furthermore, FaZAT10, a typical C2H2-ZFP, was isolated. FaZAT10 was expressed the highest in roots, and it was induced by drought, salt, low-temperature, ABA, and MeJA treatments. It was localized in the nucleus and showed no transactivation activity in yeast cells. Overall, these results provide useful information for enriching the analysis of the ZFPs gene family in strawberry, and they provide support for revealing the mechanism of FaZAT10 in the regulatory network of abiotic stress. 相似文献
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辣根过氧化物酶催化反应在荧光分析中的应用 总被引:2,自引:0,他引:2
辣根过氧化物酶催化反应对H2O2具有很高的专一性。在HRP催化荧光分析中讨论荧光底物的结构,将有助于揭示酶催化反应机一,对提高分析方法,灵敏度将有着极其重要的应用价值和深远意义。 相似文献
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二聚闪蒸法双环戊二烯装置对C5原料中的C4指标要求较高。辽化金兴化工厂双环戊二烯装置自从2007年12月-2008年8月,原料中碳四指标严重超标,本文从生产实际出发,详细阐述了原料中碳四含量超标对双环戊二烯加工装置运行的影响,确定了相应的解决措施。 相似文献
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针对苯酐装置顺序控制系统原采用的S5-135U程控器的不足——频繁死机,将其更新为能实现冗余的S5-155H,并根据工艺要求利用Step 5语言对原控制方案进行了完善与改进。从几年来的运行情况表明,因控制系统故障而导致装置停车事故的情况得到了改善,达到了改造的预期目的。 相似文献
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[A环-U-14C]-丙酯草醚在土壤中的吸附和解吸特性 总被引:1,自引:0,他引:1
实验室模拟条件下,采用液体闪烁测量技术研究了[A环-U-14C]-丙酯草醚在7种土壤中的吸附与解吸附性能,并对吸附常数K1与土壤理化性质的相关性进行了分析.结果表明,[A环-U-14C]-丙酯草醚易被土壤吸附,解吸率极低,在土壤中的吸附符合Freundlich方程,吸附常数Kf与土壤有机质呈显著正相关,与土壤pH值有一定相关性. 相似文献