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Search Results: 1 - 10 of 10670 matches for " Honghong Du "
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Existence and Multiplicity of Solutions for Quasilinear p(x)-Laplacian Equations in RN  [PDF]
Honghong Qi, Gao Jia
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.310156
Abstract: We establish some results on the existence of multiple nontrivial solutions for a class of p(x)-Lap-lacian elliptic equations without assumptions that the domain is bounded. The main tools used in the proof are the variable exponent theory of generalized Lebesgue-Sobolev spaces, variational methods and a variant of the Mountain Pass Lemma.
7-(3-Nitrophenyl)-9,10-dihydro-7H-benzo[h]cyclopenta[b]quinolin-8(11H)-one
Tuanjie Li,Honghong Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811043546
Abstract: In the title compound, C22H16N2O3, the naphthalene ring, the 1,4-dihydropyridine ring and the cyclopent-2-enone ring are nearly coplanar, with the dihedral angles between the neighbouring rings being 1.93 (11) and 2.30 (9)°, respectively. The benzene ring group at position 7 and the 1,4-dihydropyridine ring form a dihedral angle of 78.75 (4)°. Intermolecular N—H...O hydrogen bonds and C—H...π interactions stabilize the crystal packing.
4-(4-Bromophenyl)-3-methyl-1-phenyl-6,7-dihydro-1H-pyrazolo[3,4-b]thieno[2,3-e]pyridine 5,5-dioxide
Tuanjie Li,Honghong Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811045697
Abstract: In the title compound, C21H16BrN3O2S, the pyrazole and pyridine rings are nearly coplanar, the dihedral angle between their planes being 3.17 (14)°. The 2,3-dihydrothiophene ring adopts an envelope conformation. The 4-bromophenyl/pyridine ring and phenyl/pyrazole rings form dihedral angles of 60.06 (9) and 33.49 (11)°, respectively. There is an intramolecular C—H...N hydrogen bond. The crystal packing is stabilized by intermolecular C—H...O hydrogen bonding and C—H...π interactions.
Effects of light, temperature and pH on spore germination and early gametophytic development of Alsophila metteniana
光照、温度和pH值对小黑桫椤孢子萌发及早期配子体发育的影响

Honghong Du,Yang Li,Dong Li,Shaojun Dai,Chuangdao Jiang,Lei Shi,
杜红红
,李杨,李东,戴绍军,姜闯道,石雷

生物多样性 , 2009,
Abstract: 小黑桫椤(Alsophila metteniana)被列为我国国家二级保护植物。为探讨其种群数量下降原因, 作者采用无菌培养方法和显微观察技术, 在实验条件下研究了光照强度、光质、温度和pH值对小黑桫椤孢子萌发及早期配子体发育的影响。结果表明: 孢子萌发和配子体发育的最适光照强度为40–70 μmol;m–2;s–1, 全黑暗时孢子不萌发;白光、红光、黄光和蓝光下的萌发率分别为68.78%、65.66%、63.74%和7.51%; 白光和蓝光下配子体可以形成正常的心形原叶体, 红光和黄光下配子体发育一直处于丝状体阶段。孢子萌发和配子体发育需要在酸性土壤进行(pH值在3.7–6.7); 孢子萌发的适宜温度为20–30℃。从孢子接种到心形原叶体形成需要55 d左右。根据上述结果, 我们认为光照强度是小黑桫椤孢子萌发的必需条件, 光质是限制小黑桫椤孢子繁殖的重要原因; 光质、温度和pH值等环境因子的作用和配子体发育时间等是导致小黑桫椤种群数量日趋减少的主要原因。
Discussion on the enlightenment of the examination content reform on college students’ study ——Taking an open question of college Physics examination as an example
Xiuli BAI,Honghong ZHU,Xishun XIE
Asia-Pacific Forum on Science Learning and Teaching , 2008,
Abstract: Through the comparative study of the domestic and international examination content, the author thinks that reforming the existing examination and constructing suitable examination content for quality education are necessary. Taking an adaptable open question as an example, the author applies the learning theory of constructivism to elaborate on the cultivation of students’ ability to use exploratory study methods. The inspirational process guides students to learn how to study and how to innovate.
High Resolution Melting Analysis for Detecting p53 Gene Mutations in Patients with Non-small Cell Lung Cancer
Zhihong CHEN,Shejuan AN,Zhi XIE,Honghong YAN
Chinese Journal of Lung Cancer , 2011, DOI: 10.3779/j.issn.1009-3419.2011.10.01
Abstract: Background and objective It has been proven that p53 gene was related to many human cancers. The mutations in p53 gene play an important role in carcinogensis and mostly happened in exon 5-8. The aim of this study is to establish a high resolution melting (HRM) assay to detect p53 mutations from patients with non-small cell lung cancer (NSCLC), to investigate the characteristics of p53 gene mutations, and to analyze the relationship between p53 mutations and evolution regularity of pathogenesis. Methods p53 mutations in exon 5-8 were detected by HRM assay on DNA insolated from 264 NSCLC samples derived from tumor tissues and 54 control samples from pericancerous pulmonary tissues. The mutation samples by the HRM assay were confirmed by sequencing technique. Samples which were positive by HRM but wild type by sequencing were further confirmed by sub-clone and sequencing. Results No mutation was found in 54 pericancerous pulmonary samples by HRM assay. 104 of the 264 tumor tissues demonstrated mutation curves by HRM assay, 102 samples were confirmed by sequencing, including 95 point mutations and 7 frame shift mutations by insertion or deletion. The mutation rate of p53 gene was 39.4%. The mutation rate from exon 5-8 were 11.7%, 8%, 12.5% and 10.6%, respectively and there was no statistically significant difference between them (P=0.35). p53 mutations were significantly more frequent in males than that in females, but not related to the other clinicopathologic characteristics. Conclusion The results indicate that HRM is a sensitive in-tube methodology to detect for mutations in clinical samples. The results suggest that the arising p53 mutations in NSCLC may be due to spontaneous error in DNA synthesis and repair.
HIV-1 Tat Co-Operates with IFN-γ and TNF-α to Increase CXCL10 in Human Astrocytes
Rachel Williams, Honghong Yao, Navneet K. Dhillon, Shilpa J. Buch
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0005709
Abstract: HIV-associated neurological disorders (HAND) are estimated to affect 60% of the HIV infected population. HIV-encephalitis (HIVE), the pathological correlate of the most severe form of HAND is often characterized by glial activation, cytokine/chemokine dysregulation, and neuronal damage and loss. However, the severity of HIVE correlates better with glial activation rather than viral load. One of the characteristic features of HIVE is the increased amount of the neurotoxic chemokine, CXCL10. This chemokine can be released from astroglia activated with the pro-inflammatory cytokines IFN-γ and TNF-α, in conjunction with HIV-1 Tat, all of which are elevated in HIVE. In an effort to understand the pathogenesis of HAND, this study was aimed at exploring the regulation of CXCL10 by cellular and viral factors during astrocyte activation. Specifically, the data herein demonstrate that the combined actions of HIV-1 Tat and the pro-inflammatory cytokines, IFN-γ and TNF-α, result in the induction of CXCL10 at both the RNA and protein level. Furthermore, CXCL10 induction was found to be regulated transcriptionally by the activation of the p38, Jnk, and Akt signaling pathways and their downstream transcription factors, NF-κB and STAT-1α. Since CXCL10 levels are linked to disease severity, understanding its regulation could aid in the development of therapeutic intervention strategies for HAND.
Platelet-Derived Growth Factor CC-Mediated Neuroprotection against HIV Tat Involves TRPC-Mediated Inactivation of GSK 3beta
Fuwang Peng, Honghong Yao, Halis Kaan Akturk, Shilpa Buch
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0047572
Abstract: Platelet-derived growth factor-CC (PDGF-CC) is the third member of the PDGF family, and has been implicated both in embryogenesis and development of the CNS. The biological function of this isoform however, remains largely unexplored in the context of HIV-associated dementia (HAD). In the present study, we demonstrate that exposure of human neuroblastoma cells SH-SY5Y to HIV transactivator protein Tat resulted in decreased intrinsic expression of PDGF-CC as evidenced by RT-PCR and western blot assays. Reciprocally, pretreatment of SH-SY5Y cells with PDGF-CC abrogated Tat-mediated neurotoxicity by mitigating apoptosis and neurite & MAP-2 loss. Using pharmacological and loss of function approaches we identified the role of phosphatidylinositol 3-kinase (PI3K)/Akt signaling in PDGF-CC-mediated neuroprotection. We report herein a novel role about the involvement of transient receptor potential canonical (TRPC) channel 1 in modulation of calcium transients in PDGF-CC-mediated neuroprotection. Furthermore we also demonstrated PDGF-CC-mediated inactivation of the downstream mediator - glycogen synthase kinase 3β (GSK3β) evidenced by its phosphorylation at Ser-9. This was further validated by gain and loss of function studies using cells transfected with either the wild type or mutant GSK3β constructs. Intriguingly, pretreatment of cells with either the PI3K inhibitor or TRPC blocker resulted in failure of PDGF-CC to inactivate GSK3β, thereby suggesting the intersection of PI3K and TRPC signaling at GSK3β. Taken together our findings lead to the suggestion that PDGF-CC could be developed as a therapeutic target to reverse Tat-mediated neurotoxicity with implications for HAD.
Morphine Induces Expression of Platelet-Derived Growth Factor in Human Brain Microvascular Endothelial Cells: Implication for Vascular Permeability
Hongxiu Wen, Yaman Lu, Honghong Yao, Shilpa Buch
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0021707
Abstract: Despite the advent of antiretroviral therapy, complications of HIV-1 infection with concurrent drug abuse are an emerging problem. Morphine, often abused by HIV-infected patients, is known to accelerate neuroinflammation associated with HIV-1 infection. Detailed molecular mechanisms of morphine action however, remain poorly understood. Platelet-derived growth factor (PDGF) has been implicated in a number of pathological conditions, primarily due to its potent mitogenic and permeability effects. Whether morphine exposure results in enhanced vascular permeability in brain endothelial cells, likely via induction of PDGF, remains to be established. In the present study, we demonstrated morphine-mediated induction of PDGF-BB in human brain microvascular endothelial cells, an effect that was abrogated by the opioid receptor antagonist-naltrexone. Pharmacological blockade (cell signaling) and loss-of-function (Egr-1) approaches demonstrated the role of mitogen-activated protein kinases (MAPKs), PI3K/Akt and the downstream transcription factor Egr-1 respectively, in morphine-mediated induction of PDGF-BB. Functional significance of increased PDGF-BB manifested as increased breach of the endothelial barrier as evidenced by decreased expression of the tight junction protein ZO-1 in an in vitro model system. Understanding the regulation of PDGF expression may provide insights into the development of potential therapeutic targets for intervention of morphine-mediated neuroinflammation.
Multi-Representation of Symbolic and Nonsymbolic Numerical Magnitude in Chinese Number Processing
Chao Liu,Honghong Tang,Yue-Jia Luo,Xiaoqin Mai
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0019373
Abstract: Numerical information can be conveyed by either symbolic or nonsymbolic representation. Some symbolic numerals can also be identified as nonsymbolic quantities defined by the number of lines (e.g., I, II, III in Roman and , , in Japanese Kanji and Chinese). Here we report that such multi-representation of magnitude can facilitate the processing of these numerals under certain circumstances. In a magnitude comparison task judging 1 to 9 (except 5) Chinese and Arabic numerals presented at the foveal (at the center) or parafoveal (3° left or right of the center) location, multi-representational small-value Chinese numerals showed a processing advantage over single-representational Arabic numerals and large-value Chinese numerals only in the parafoveal condition, demonstrated by lower error rates and faster reaction times. Further event-related potential (ERP) analysis showed that such a processing advantage was not reflected by traditional ERP components identified in previous studies of number processing, such as N1 or P2p. Instead, the difference was found much later in a N400 component between 300–550 msec over parietal regions, suggesting that those behavioral differences may not be due to early processing of visual identification, but later processing of subitizing or accessing mental number line when lacking attentional resources. These results suggest that there could be three stages of number processing represented separately by the N1, P2p and N400 ERP components. In addition, numerical information can be represented simultaneously by both symbolic and nonsymbolic systems, which will facilitate number processing in certain situations.
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