四种抗癌物质对微管蛋白体外聚合及热变性的影响

用浊度法和差示扫描量热法研究了四种小分子抗癌物质[紫杉醇、卡铂、猪芽藻提取物(ZYZ)和番荔枝素提取物(F43)]对微管蛋白体外聚合及热变性的影响。实验结果表明：当四种化合物的浓度均为15 μmol•L－1时，紫杉醇和猪芽藻提取物(ZYZ)能促进微管蛋白的聚合并使其热变性温度升高，而卡铂和番荔枝素提取物(F43)却对微管蛋白的聚合及热变性温度无明显影响。综合上述实验结果，对四种抗癌物质与微管蛋白相互作用的机理进行了讨论。     

The cubic space group of tungstogallate acid,H<Subscript>5</Subscript>GaW<Subscript>12</Subscript>O<Subscript>40</Subscript>

The space group of tungstogallate acid, H₅GaW₁₂O₄₀, reported by Niu et al. (J. Chem. Crystallogr. 2003, 33, 799) should be I–43m instead of Cm; the monoclinic C-centered cell is transformed to the I-centered cubic cell by (1 0 0; ,– , 1; – , – , –1).     

Crystal structures of bis(4-dimethylaminopyridinium) tetrachlorocobaltate(II) and bis-[1,3-di (ammoniummethyl)benzene]tetrachlorocobaltate(II)

The crystal structures consist of organoammonium cations hydrogen bonded to tetrahedral CoCl₄ ^2– anions. In the 4-dimethylaminopyridinium salt, [(CH₃)₂NC₅H₅NH]₂CoCl₄, pairs of cations hydrogen bond in an asymmetric fashion to two of the chlorines in each anion. The planar cations form two sets of 43p414671228/xxlarge960.gif" alt="pgr" align="BASELINE" BORDER="0">–43p414671228/xxlarge960.gif" alt="pgr" align="BASELINE" BORDER="0"> stacks, first parallel to the a axis and the second parallel to the b axis. The anions lie between these two nonintersecting sets of stacks. In contrast, for the second compound, [C₆H₄(CH₂NH₃)₂]CoCl₄, the tetrahedral CoCl₄ ^2– anions form layers lying parallel to the bc plane. The 1,3-di(ammoniummethyl)benzene cations crosslink adjacent anionic layers, forming a lamellar structure of alternating organic and inorganic layers.     

债务治理、地方融资平台期限错配与企业绩效——基于“43号文”的研究

本文利用我国2009~2018年2193家地方融资平台的面板数据,采用基准回归模型和中介效应模型,分析了43号文件对地方融资平台期限错配的治理效应,并进一步分析了债务治理是如何通过缓解地方融资平台期限错配最终改善企业绩效的。结果表明:(1)43号文改善了地方融资平台期限错配问题,并增加了企业绩效,这一结论在稳健性检验中也得到了验证;(2)43号文改善了省及省会(单列市)类地方融资平台的期限错配问题,并相应的改善了企业的绩效;(3)43号文改善了土木工程类和房地产类地方融资平台的期限错配问题,并相应的改善了企业的绩效。     

Preclinical Investigation in Neuroprotective Effects of the GPR55 Ligand VCE-006.1 in Experimental Models of Parkinson’s Disease and Amyotrophic Lateral Sclerosis

Cannabinoids act as pleiotropic compounds exerting, among others, a broad-spectrum of neuroprotective effects. These effects have been investigated in the last years in different preclinical models of neurodegeneration, with the cannabinoid type-1 (CB₁) and type-2 (CB₂) receptors concentrating an important part of this research. However, the issue has also been extended to additional targets that are also active for cannabinoids, such as the orphan G-protein receptor 55 (GPR55). In the present study, we investigated the neuroprotective potential of VCE-006.1, a chromenopyrazole derivative with biased orthosteric and positive allosteric modulator activity at GPR55, in murine models of two neurodegenerative diseases. First, we proved that VCE-006.1 alone could induce ERK1/2 activation and calcium mobilization, as well as increase cAMP response but only in the presence of lysophosphatidyl inositol. Next, we investigated this compound administered chronically in two neurotoxin-based models of Parkinson’s disease (PD), as well as in some cell-based models. VCE-006.1 was active in reversing the motor defects caused by 6-hydroxydopamine (6-OHDA) in the pole and the cylinder rearing tests, as well as the losses in tyrosine hydroxylase-containing neurons and the elevated glial reactivity detected in the substantia nigra. Similar cytoprotective effects were found in vitro in SH-SY5Y cells exposed to 6-OHDA. We also investigated VCE-006.1 in LPS-lesioned mice with similar beneficial effects, except against glial reactivity and associated inflammatory events, which remained unaltered, a fact confirmed in BV2 cells treated with LPS and VCE-006.1. We also analyzed GPR55 in these in vivo models with no changes in its gene expression, although GPR55 was down-regulated in BV2 cells treated with LPS, which may explain the lack of efficacy of VCE-006.1 in such an assay. Furthermore, we investigated VCE-006.1 in two genetic models of amyotrophic lateral sclerosis (ALS), mutant SOD1, or TDP-43 transgenic mice. Neither the neurological decline nor the deteriorated rotarod performance were prevented with this compound, and the same happened with the elevated microglial and astroglial reactivities, albeit modest spinal motor neuron preservation was achieved in both models. We also analyzed GPR55 in these in vivo models and found no changes in both TDP-43 transgenic and mSOD1 mice. Therefore, our findings support the view that targeting the GPR55 may afford neuroprotection in experimental PD, but not in ALS, thus stressing the specificities for the development of cannabinoid-based therapies in the different neurodegenerative disorders.     

一种席夫碱Al3+荧光探针的制备及细胞成像应用

以4-（二乙氨基）水杨醛与奥肼缩合制备了一例席夫碱类荧光探针1,通过¹H NMR、¹³C NMR和电喷雾电离质谱表征了1的结构。光谱分析实验结果显示,探针1可选择性与Al^3&#43;作用,在495 nm处荧光发射峰显著增强。探针对Al^3&#43;的检测灵敏度高,检测限低至1.44 μmol·L^-1。结合理论计算,证实探针以三齿配位的模式,与Al^3&#43;形成1∶1型稳定配合物。此外,该探针还可用于活细胞中Al^3&#43;的检测。     

一个基于苯并噻唑的铜离子荧光探针的合成、晶体结构和光谱性质

合成和表征了一个苯并噻唑类的荧光探针N-(4-(苯并噻唑-2-基)苯基)-2-((2-羟乙基)(吡啶-2-甲基)氨基)乙酰胺(FL),用光谱法研究了它与各种金属离子的识别特性。结果表明:FL对Cu2+具有较高的选择性和灵敏度,并且对Cu2+的识别不受其它金属离子的干扰。FL与Cu2+形成配合物的结合比为1∶1,其荧光强度与Cu2+浓度(3.8~9.6μmol·L-1)呈现较好的线性关系,而且它还可应用于自来水和湖水等水体样品中Cu2+的检测。     

改性硅藻土负载亚铁氰化铜复合物的制备及其对Cs+的吸附性能

采用水热法、以氯化铝为铝源对硅藻土(De)进行改性,通过浸渍法将亚铁氰化铜(KCu HCF)纳米颗粒负载于改性De表面,制备出γ-Al OOH/De-KCu HCF和γ-Al₂O₃/De-KCu HCF两种复合吸附剂,对所制备的吸附剂进行了表征,并研究了其对Cs⁺的吸附性能。结果表明,所制备吸附剂具有优异的Cs⁺吸附性能,γ-Al OOH/De-KCu HCF和γ-Al₂O₃/De-KCu HCF最高吸附容量分别可达75.44、84.02 mg·g^-1,γ-Al₂O₃/De-KCu HCF对模拟卤水中Cs⁺的吸附率高达97.55%;以3 mol·L^-1NH₄NO₃为脱附剂,经3级连续脱附后,γ-Al₂O₃/De-KCu HCF的Cs⁺脱附率...     

TODGA/[C2mim][NTf2]萃取Th4+的研究

研究了N,N,N',N'-四辛基-3-氧戊二酰胺(TODGA)溶于疏水性离子液体咪唑类离子液体1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐([C₂mim][NTf₂])中对硝酸水溶液体系中四价钍离子(Th^4&#43;)的萃取行为.详细考察了接触时间、酸度、Th^4&#43;浓度、TODGA浓度、温度对TODGA/[C₂mim][NTf₂]体系萃取性能的影响.作为对比,我们还考察了TODGA在传统有机溶剂异辛烷中对Th^4&#43;的萃取.结果表明:TODGA/[C₂mim][NTf₂]体系对Th^4&#43;的萃取是吸热反应,且在50 ℃下,能在5 min内达到平衡.萃取体系随着酸度对Th^4&#43;的萃取性能先降后增大;Th^4&#43;浓度的增大,TODGA浓度的降低,对Th^4&#43;的萃取性能下降.TODGA在离子液体萃取体系中比在有机体系中有更好的Th^4&#43;萃取效果,特别是在低酸条件下.通过萃取机理研究,推测出在低酸下萃取反应是离子交换且TODGA与Th^4&#43;配比为2∶1,在高酸下萃取是中性配位.     

红色长余辉荧光粉Ca2Zn4Ti16O38:Pr3+的水热辅助合成及发光性质

采用水热法辅助合成了纯相Ca₂Zn₄Ti₁₆O₃₈:Pr^3&#43;荧光粉,初始n_Ca:n_Zn:n_Ti=2:4.1:15,煅烧条件为1 050 ℃空气气氛烧结5 h.并以X射线衍射、扫描电镜、紫外可见漫反射光谱和荧光光谱表征了样品的物相组成、微观形貌和光谱性质.合成的荧光粉在高温煅烧后仍较好地保持了球形的微观形态,优化的Pr^3&#43;掺杂浓度为0.015.Ca₂Zn₄Ti₁₆O₃₈:Pr^3&#43;荧光粉在471 nm波长激发下发射红光,发射谱通过高斯分峰拟合得到位于605、620和645 nm的3个发射峰,分别对应于Pr^3&#43;的¹D₂→³H₄,³P₀→³H₆和³P₀→³F₂跃迁.在471 nm波长激发下,Ca₂Zn₄Ti₁₆O₃₈:Pr^3&#43;的614 nm红光发射表现出超长余辉特性,表明该荧光粉是一种能被可见光有效激发的红色长余辉荧光粉.