MOLECULES AND NEW INTERACTIONAL STRUCTURES FOR A(2+1)-DIMENSIONAL GENERALIZED KONOPELCHENKO-DUBROVSKY-KAUP-KUPERSHMIDT EQUATION

Soliton molecules(SMs)of the(2+1)-dimensional generalized KonopelchenkoDubrovsky-Kaup-Kupershmidt(gKDKK)equation are found by utilizing a velocity resonance ansatz to N-soliton solutions,which can transform to asymmetric solitons upon assigning appropriate values to some parameters.Furthermore,a double-peaked lump solution can be constructed with breather degeneration approach.By applying a mixed technique of a resonance ansatz and conjugate complexes of partial parameters to multisoliton solutions,various kinds of interactional structures are constructed;There include the soliton molecule(SM),the breather molecule(BM)and the soliton-breather molecule(SBM).Graphical investigation and theoretical analysis show that the interactions composed of SM,BM and SBM are inelastic.

Resonant interactions among two-dimensional nonlinear localized waves and lump molecules for the(2+1)-dimensional elliptic Toda equation

The(2+1)-dimensional elliptic Toda equation is a high-dimensional generalization of the Toda lattice and a semidiscrete Kadomtsev–Petviashvili I equation.This paper focuses on investigating the resonant interactions between two breathers,a breather/lump and line solitons as well as lump molecules for the(2+1)-dimensional elliptic Toda equation.Based on the N-soliton solution,we obtain the hybrid solutions consisting of line solitons,breathers and lumps.Through the asymptotic analysis of these hybrid solutions,we derive the phase shifts of the breather,lump and line solitons before and after the interaction between a breather/lump and line solitons.By making the phase shifts infinite,we obtain the resonant solution of two breathers and the resonant solutions of a breather/lump and line solitons.Through the asymptotic analysis of these resonant solutions,we demonstrate that the resonant interactions exhibit the fusion,fission,time-localized breather and rogue lump phenomena.Utilizing the velocity resonance method,we obtain lump–soliton,lump–breather,lump–soliton–breather and lump–breather–breather molecules.The above works have not been reported in the(2+1)-dimensional discrete nonlinear wave equations.

潮湿环境下金红石型纳米TiO_(2)掺杂聚乙烯的分子动力学模拟

为了从微观角度分析金红石型纳米TiO_(2)掺杂对聚乙烯(polyethylene,PE)材料性能的影响,采用分子动力学模拟方法,构建不同水分子质量分数的PE和TiO_(2)/PE复合模型,以温度为变量研究分析纳米TiO_(2)改性PE材料前后的热力学性能和微观结构以及水分子在复合体系中的扩散能力。结果表明:纳米TiO_(2)的掺杂使PE体系的玻璃化转变温度提高了33 K,杨氏模量提升了428.17%,剪切模量提升了338.62%。纳米TiO_(2)极大抑制了PE分子链的运动和水分子的扩散,增强了复合体系的稳定性。水分子的加入和温度的升高降低了复合体系的热力学性能,这两者均破坏了复合体系的稳定性。

2型糖尿病下肢血管病变患者介入治疗后血清NLRP3及sVCAM-1水平对再狭窄的意义

目的探讨2型糖尿病下肢血管病变患者介入治疗后血清NOD样受体蛋白3(NLRP3)及可溶性血管细胞黏附分子-1(sVCAM-1)水平对再狭窄的意义。方法回顾性分析2022年1月~2023年1月于河北省邯郸市中心医院血管介入科104例成功行血管介入治疗的2型糖尿病下肢血管病变患者的临床资料。根据介入后再狭窄发生情况分为再狭窄组(n=20)和无再狭窄组(n=84),比较两组患者一般资料及介入后24 h血清NLRP3、sVCAM-1水平,采用多因素Logistic回归模型分析再狭窄发生的影响因素;创建受试者工作特征(ROC)曲线,分析血清NLRP3、sVCAM-1检测对再狭窄的预测价值。结果与无再狭窄组相比,再狭窄组患者2型糖尿病病程、下肢动脉病变长度更长,Fontaine分期Ⅳ期占比、下肢动脉完全闭塞占比及血清糖化血红蛋白(HbA1c)、超敏C反应蛋白(hs-CRP)、NLRP3、sVCAM-1水平更高(P<0.05);多因素Logistic回归分析显示,下肢动脉完全闭塞、下肢动脉病变长度、HbA1c、NLRP3及sVCAM-1是2型糖尿病下肢血管病变患者介入后再狭窄发生的影响因素(P<0.05);ROC曲线显示,血清NLRP3、sVCAM-1联合检测对2型糖尿病下肢血管病变患者介入后再狭窄发生的预测价值较高,敏感度为95.00%,特异度为71.43%,ROC曲线下面积为0.929。结论血清NLRP3、sVCAM-1水平高表达均是2型糖尿病下肢血管病变患者介入治疗后再狭窄发生的危险因素,二者联合检测能提高2型糖尿病下肢血管病变患者介入治疗后再狭窄预测的准确性。

Chemical Reaction and Energy Transfer Between Hot H Atoms and CO2 Molecules

Collisions between hot H atoms and CO2 molecules were studied experimentally by time resolved Fourier transform infrared emission spectroscopy. H atoms with three translational energies, 174.7, 241.0 and 306.2 k J/mol respectively, were generated by UV laser photolysis to initiate a chemical reaction of H＋CO2→OH＋CO. Vibrationally excited CO （v≤2） was observed in the spectrum, where CO was the product of the reaction. The highly efficient T-V energy transfer fro,n the hot H atoms to the CO2 was verified too. The highest vibrational level of v=4 in CO2 （va） was found. Rate ratio of the chemical reaction to the energy transfer was estimated as 10.

人类白细胞抗原HLA-A基因多态性与HBV携带的相关性研究

目的探讨人类白细胞抗原(human leukocyte antigen,HLA)基因多态性与乙型肝炎病毒(HBV)感染的相关性。方法收集云南省昆明市延安医院健康体检者静脉血样本501例,采用酶联免疫吸附试验(ELISA)检测HBV二对半,根据HBV二对半检测结果分为HBV携带组和既往感染组以及健康对照组3组,用序列特异性引物聚合酶链反应(polymerase chain reaction with sequence specific primers,PCR-SSP)基因分型技术检测HLA-A抗原的基因型,将HBV携带组和健康对照组以及HBV既往感染组和健康对照组的HLA-A基因多态性的分布频率进行比较。采用SPSS17.0软件进行数据统计分析。结果健康对照组HLA-A2阳性数占比47.49%,等位基因频率数占比31.29%;健康对照组基因分布频率总体与中华骨髓库发布的中国常见及确认的HLA-A等位基因表一致。HBV携带组HLA-A2阳性数占比63.04%,等位基因频率数占比42.23%,携带者的HLA-A2阳性率和等位基因频率差异有统计学意义(P<0.05);HBV既往感染组HLA-A2阳性数占比56.14%,等位基因频率数占比35.97%,既往感染组的HLA-A2阳性率和等位基因频率差异无统计学意义(P>0.05)。结论HLA-A2基因可能是慢性乙型肝炎HBV携带者的易感基因。

Autler-Townes Splitting in Photoelectron Spectrum of Three-Level Li2 Molecule in Ultrashort Pulse Laser Fields

The Autler-Townes （AT） splitting in femtosecond photoelectron spectrum of three-level Li2 molecules is theoretically investigated using time-dependent quantum wave packet method. With proper femtosecond laser pulses, three peaks of the AT splitting can be observed in the photoelectron spectrum. The AT splitting stems from rapid Rabi oscillation caused by intense ultrashort laser pluses. The effects of laser parameters on the molecular ionization dynamics are also discussed.

角质形成细胞与2型炎症互作在特应性皮炎发病机制中的作用

特应性皮炎(AD)患者皮肤屏障功能受损,与角质形成细胞(KC)异常密切相关。在外界因素的刺激下,KC释放炎症因子、趋化因子等炎症介质,作用于2型免疫细胞,进而引起皮肤免疫向2型炎症方向偏移。反之,2型炎症进一步加剧皮肤屏障破坏,故而形成恶性循环。因此,KC和2型炎症之间的互作是促进AD发生发展、加剧炎症反应与瘙痒的重要因素。目前,AD治疗领域的靶向创新药物如生物制剂和小分子药的抗炎作用已逐步得到证实,部分研究表明他们还具有修复皮肤屏障的作用。针对KC与2型炎症互作的研究不仅有助于理解AD的发病机制,也有望优化疾病的治疗方案,提供更多治疗参考。

Autler-Townes splitting in photoelectron spectra of K_2 molecule

We investigate Autler-Townes splitting in the photoelectron spectra of K2 molecule driven by pump-probe pulses via employing the time-dependent wave packet approach. It is found that the magnitude of Aulter-Townes splitting varies with the wavelength of the intense laser pulse. In particular, the phenomenon of Aulter-Townes splitting vanishes for the far-off resonance of the pump pulse. Also, the split peaks of Autler Townes in the case of resonant pump pulse give us an approach to directly obtaining the transition dipole moment of a molecule.

Si_2O_2 molecule:structure of ground state and the excited properties under different external electric fields

Geometry and vibrational frequencies of the ground state of Si2O2 molecule are studied using density function theory （DFT） at the level of cc-pvtz and 6-311-k＋G^＊＊. It is found that the optimizing value by B31yp/cc-pvtz is closer to the experimental data. The excited properties under different external electric fields are also investigated by the time-dependent-DFT method. Transitions from the ground state of Si2O2 molecule to the first singlet state under different external electric fields can take place more easily. The corresponding absorption spectral line is about 360 nm in wavelength and the excitation energy is about 3.4 eV.

DFT calculation on relaxation and electronic structure of sulfide minerals surfaces in presence of H_2O molecule

First-principles calculations are performed to investigate the relaxation and electronic properties of sulfide minerals surfaces(MoS2, Sb2S3, Cu2 S, ZnS, PbS and FeS2) in presence of H2 O molecule. The calculated results show that the structure and electronic properties of sulfide minerals surfaces have been influenced in presence of H2 O molecule. The adsorption of the flotation reagent at the interface of mineral-water would be different from that of mineral surface due to the changes of surface structures and electronic properties caused by H2 O molecule. Hence, the influence of H2 O molecule on the reaction of flotation reagent with sulfide mineral surface will attract more attention.

Double open mouse-like terpyridine parts based amphiphilic ionic molecules displaying strengthened chemical adsorption for anticorrosion of copper in sulfuric acid solution

In this study,the benign target double terpyridine parts based amphiphilic ionic molecules(AIMs 1,2)and the reference single terpyridine segment included AIMs(AIMs 3,4)were synthesized through a multi-step method,and the molecular structures were fully characterized.The excellent anticorrosion of the target AIMs for copper surface in H_(2)SO_(4) solution was demonstrated by the electrochemistry analysis,which was more superior over those of the reference AIMs.The standard adsorption free energy changes of the target AIMs calculated by the adsorption isotherms were lower than -40 kJ·mol^(-1),suggesting an intensified chemical adsorption on metal surface.The molecular modeling and molecular dynamic computation of the studied AIMs were performed,demonstrating that the target AIMs exhibited lower highest occupied molecular orbital-lowest unoccupied molecular orbital energy gaps and greater adsorption energies than the reference ones.The chemical adsorption of the AIMs on metal surface was revealed by various spectroscopic methods including scanning electron microscopy,atomic force microscopy,Fourier transform infrared spectroscopy,attenuated total reflection infrared spectroscopy,Raman and X-ray diffraction.

赖氨酰氧化酶LOXL2稳定性的理论计算研究

赖氨酰氧化酶LOXL2是一种依赖于铜离子的胺氧化酶,催化胶原蛋白和弹性蛋白的赖氨酸残基侧链发生氧化脱氨,发挥着稳固细胞外基质的作用。而稳定性是蛋白质的一个重要特性,直接影响蛋白质的分子动态及其正常功能发挥,这与人类的健康和疾病密切相关。然而,关于LOXL2的稳定性目前鲜有报道,哪些位点对其稳定性有显著影响尚不清楚。本研究采用冷冻电镜和Alphafold2的数据,建立LOXL2的全长结构,通过分子动力学模拟得到其优化构象。再通过4种方法(mCSM,PremPS,DeepDDG和FoldX),计算所有位点的稳定性属性,筛选出对稳定性有显性影响的位点(定义为关键位点)。结果表明,95个关键位点对LOXL2的稳定性具有显著影响,在5个结构域上的分布数量依次为14、13、8、11和26,而结构域间的连接肽段上也有23个关键位点。在这些关键位点中,类型及数量分别为Leu(24个)、Val(20个)、Ile(12个)、Trp(11个)、Phe(11个)、Tyr(6个)、Cys(6个)、Met(4个)和Arg(1个)。其中大部分关键位点(88个)为疏水性质,这与蛋白质折叠的主要力量为疏水作用的情况是一致的,而Cys两两成对,构成二硫键,对LOXL2的结构及功能发挥重要作用。讨论中,我们将预测结果与实验值进行比较,并用自由能微扰方法,对部分关键位点进行比较,从多方面论证此项工作的可信度。此项研究,可为靶向LOXL2的疾病治疗研究,提供重要指导。

Cloning and identification of an angiostatic molecule IP-10/crg-2

AIM To obtain human and murine cDNAsencoding IFN--y inducible protein 10 (lP--10) andcytokine responsive gene--2 (Crg-2).METHODS The encoding genes of lP-10 and Crg2 were amplified by RT--PCR from Cultured humanfibroblast cells and Balb/ c mouse liver treatedby IFN-y and TNF-a, respectively, and clonedinto plasmids of PUC19 and PGEM3Zf(+ ).RESULTS The nucleotide sequences ot theamplified DNA were confirmed by endonucleasesdigestion and sequencing.CONCLUSION Recombinant lP-10/ crg--2 geneclones with 306 hp and 314 hp inserts wereestablished for further research on biologicalactivities and ligands of hiP-10/mCrg--2.

Interference of dissociating wave packets in the I_2 molecule driven by femtosecond laser pulses

The interference between two dissociating wave packets of the I2 molecule driven by femtosecond laser pulses is theoreticaly studied by using the time-dependent quantum wave packet method. Both the internuclear distance-and velocity-dependent density functions are calculated and discussed. It is demonstrated that the interference pattern is determined by the phase difference and the delay time between two pump pulses. With two identical pulses with a delay time of 305 fs and a FWHM of 20 fs, more interference fringes can be observed, while with two pump pulses with a delay time of 80 fs and a FWHM of 20 fs, only a few interference fringes can be observed.

嗜酸粒细胞型哮喘患儿外周血单个核细胞肿瘤坏死因子α诱导蛋白8样分子2 mRNA和M2巨噬细胞检测及意义

目的:检测嗜酸粒细胞型哮喘(EA)患儿外周血单个核细胞(PBMC)肿瘤坏死因子α诱导蛋白8样分子2(TIPE2)mRNA和M2巨噬细胞,并分析其意义。方法:回顾性收集EA患儿100例,根据糖皮质激素(ICS)治疗后2周内症状缓解情况,分为完全缓解组(78例)和部分缓解组(22例)。另选取体检健康儿童52例,设为对照组。比较三组临床资料[肺功能、血常规、呼出气一氧化氮(FeNO)]、TIPE2 mRNA、M2巨噬细胞占比、治疗前后免疫细胞[辅助性T细胞1(Th1)、辅助性T细胞2(Th2)]以及细胞因子[白细胞介素-2(IL-2)、γ-干扰素(IFN-γ)、IL-4、IL-13、精氨酸酶1(Arg-1)]。分析EA患儿预后的影响因素,并进行相关性分析。结果:完全缓解组和部分缓解组用力肺活量(FVC)、呼吸流量峰值(PEF)、第1秒用力呼气容积(FEV1)、嗜酸性粒细胞(EOS)、淋巴细胞(LYM)、白细胞(WBC)、FeNO与对照组比较差异有统计学意义(均P<0.05),但两组间上述指标比较差异无统计学意义(均P>0.05)。治疗前,完全缓解组与部分缓解组TIPE2 mRNA、M2巨噬细胞占比、M2/M1、IL-4、IL-13、IL-2、Arg-1高于对照组,Th1、Th1/Th2、IFN-γ低于对照组,且完全缓解组TIPE2 mRNA、M2巨噬细胞、Th1、IL-4、IL-13、Arg-1与部分缓解组比较差异有统计学意义(均P<0.05)。治疗后,完全缓解组和部分缓解组TIPE2 mRNA、M2巨噬细胞占比、M2/M1、IL-4、IL-13、IL-2、Arg-1降低,Th1、Th1/Th2、IFN-γ升高,且完全缓解组与部分缓解组比较差异有统计学意义(均P<0.05)。Logistic回归分析结果显示,TIPE2 mRNA、M2巨噬细胞、IL-4、IL-13、Arg-1为EA患儿预后的影响因素(均P<0.05)。Pearson分析结果显示,M2巨噬细胞与IL-4、IL-13呈负相关,与TIPE2 mRNA、Arg-1呈正相关;TIPE2 mRNA与IL-4、IL-13的水平呈负相关(均P<0.05)。结论:EA患儿PBMC中TIPE2 mRNA与M2巨噬细胞呈高表达,均为影响预后的因素。

新型Bcl-2小分子抑制剂的设计、合成与初步活性评价

目的设计并合成一系列新型Bcl-2小分子抑制剂,测试其对Bcl-2和Bcl-2 G101V(Bcl-2突变体)与BH3-only蛋白相互作用的抑制活性,初步探究其构效关系,为后续相关研究提供参考。方法以临床化合物BGB-11417为先导化合物,通过骨架跃迁等方法,设计新型含螺环结构的Bcl-2小分子抑制剂。以苯甲醛为原料,通过取代、环化和偶联等反应合成目标化合物,并通过1H NMR和LC-MS进行结构确定。采用时间分辨荧光共振能量转移(TR-FRET)评价目标化合物对Bcl-2和Bcl-2 G101V(Bcl-2突变体)与BH3-only蛋白相互作用的抑制能力。结果共合成8个新型螺环Bcl-2小分子抑制剂,其中29a[IC_(50)(Bcl-2):0.8 nmol·L^(-1),IC_(50)(Bcl-2 G101V):55.41 nmol·L^(-1)],29d[IC_(50)(Bcl-2):0.27 nmol·L^(-1),IC_(50)(Bcl-2 G101V):18.65 nmol·L^(-1)]对Bcl-2和Bcl-2 G101V与BH3-only蛋白的相互作用有较好的抑制活性。结论建立了一种新型螺环Bcl-2小分子抑制剂合成方法,发现了对Bcl-2和Bcl-2 G101V(Bcl-2突变体)与BH3-only蛋白相互作用有较好抑制活性的新化合物,其中29d具有进一步研究的价值。

马铃薯三糖甘草次酸衍生物通过抑制SARS-CoV-2进入靶细胞作为潜在的小分子新冠病毒融合抑制剂

目的 研究马铃薯三糖甘草次酸衍生物能否通过抑制SARS-CoV-2进入靶细胞,作为潜在的小分子新冠病毒融合抑制剂。方法 以天然SARS-CoV-2进入抑制剂甘草酸为先导化合物,利用活性亚结构的拼合原理等设计并合成了系列马铃薯三糖甘草次酸衍生物。利用SARS-CoV-2假病毒体外细胞感染模型,检测该系列甘草次酸衍生物的体外抗SARS-CoV-2活性;利用表面等离子共振技术及假病毒模型寻找先导化合物1b的抗病毒作用靶点;利用SARS-CoV-2 S蛋白介导的细胞-细胞融合体系,检测先导化合物1b是否作用于SARS-CoV-2病毒入侵宿主的膜融合过程;基于分子对接与定点突变技术,确定先导化合物1b与S蛋白的作用模式等。结果 先导化合物1b对SARS-CoV-2奥密克戎假病毒有显著抑制作用,EC50值为3.28μmol/L(P<0.05),对其它SARS-CoV-2变异株假病毒有广谱抗病毒活性。细胞-细胞膜融合实验显示1b能够抑制合胞体的形成。分子对接预测先导化合物1b可与S1与S2亚基交界处的空腔中的Glu309、Ser305、Arg765、Lys964等多个保守氨基酸残基产生氢键作用,亲和力为-8.6 kcal/mol。化合物1b在10、5、2.5、1.25μmol/L时对Arg765、Lys964、Glu309和Leu303突变后的假病毒的抑制活性显著降低(P<0.01)。结论 马铃薯三糖甘草次酸衍生物能够靶向作用于S蛋白,特异性干扰病毒-细胞膜融合阶段,继而发挥抗SARS-CoV-2感染的作用,是一类结构新颖的小分子SARS-CoV-2融合抑制剂。

Effect of pump-1 laser on Autler Townes splitting in photoelectron spectrum of K_2 molecule

We theoretically investigate the Autler–Townes（AT） splitting in the photoelectron spectrum of four-level ladder K2 molecule driven by a pump 1-pump 2-probe pulse via employing the time-dependent wave packet approach. The effects of the pump-1 laser intensity and wavelength on AT splitting are studied for the first time. The magnitude of AT splitting increases with increasing the pump-1 laser intensity. The triple splitting with asymmetric profile occurs due to the nonresonant excitation. The triple structure is transformed into a double structure（near-resonant region）, and then becomes a peak（far-off resonant region） progressively as the pump-1 laser is detuned from the resonance wavelength, which can be explained in terms of the asymmetric excitation/population of dressed states. The splitting between adjacent peaks and the splitting between the two sideband peaks in the triplet do not change with the pump-1 pulse wavelength. The three peaks shift toward lower energy with the same shift 1/4^＊△1 as the pump-1 wavelength changes in near-resonant region.The asymptotic behaviors of AT splitting with the pump-1 laser intensity are interesting in the threshold points of the near-resonant region and the far-off resonant region.

基于ERK1/2翻译后修饰调控及空间性调节的抗癌策略研究进展

ERK1/2是一种介导细胞信号转导的关键蛋白,参与调节细胞的染色质重塑、核解体、增殖、存活、代谢、迁移和分化等生物学过程。其过度激活与癌症的发生进展密切相关,机制表现为上游通路分子或调节因子的基因突变使ERK1/2过度激活及针对上述靶点进行抑制后的ERK1/2再激活。因而ERK1/2为一个有潜在价值的靶点。本文对ERK1/2的翻译后修饰调控及空间性调节的机制研究和相应小分子抑制剂的应用现状进行了讨论,总结并展望了目前靶向调控ERK1/2的抗癌策略及针对潜在靶点展开探索的可能性,为ERK1/2作为抗癌理想靶点的开发性研究提供了新思路。