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Search Results: 1 - 10 of 51184 matches for " PAN Yuan-Zhi "
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Cloning and Characterization of a Novel Vacuolar Na+/H+ Antiporter Gene (Dgnhx1) from Chrysanthemum
Qing-Lin Liu, Ke-Dong Xu, Ming Zhong, Yuan-Zhi Pan, Bei-Bei Jiang, Guang-Li Liu, Yin Jia
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0083702
Abstract: Plant vacuolar Na+/H+ antiporter genes play significant roles in salt tolerance. However, the roles of the chrysanthemum vacuolar Na+/H+ antiporter genes in salt stress response remain obscure. In this study, we isolated and characterized a novel vacuolar Na+/H+ antiporter gene DgNHX1 from chrysanthemum. The DgNHX1 sequence contained 1920 bp with a complete open reading frame of 1533 bp encoding a putative protein of 510 amino acids with a predicted protein molecular weight of 56.3 kDa. DgNHX1 was predicted containing nine transmembrane domains. Its expression in the chrysanthemum was up-regulated by salt stress, but not by abscisic acid (ABA). To assess roles of DgNHX1 in plant salt stress responses, we performed gain-of-function experiment. The DgNHX1-overexpression tobacco plants showed significant salt tolerance than the wild type (WT). The transgenic lines exhibited more accumulation of Na+ and K+ under salt stress. These findings suggest that DgNHX1 plays a positive regulatory role in salt stress response.
Effects of light regimes on photosynthetic characteristics and antioxidant system in seedlings of two alder species

LIU Shi-Liang,MA Ming-Dong,PAN Yuan-Zhi,WEI Liu-Li,HE Cheng-Xiang,YANG Kai-Mao,

植物生态学报 , 2012,
Abstract: Aims Our objective was to investigate the effects of different light intensities on leaf morphology, photosynthetic capacity, heat dissipation and antioxidant enzyme activities in seedlings of Alnus formosana and A. cremastogyne from a hilly region near Lingyan Mountain in northwestern Sichuan Province in China. We also discuss photosynthetic acclimation and photoprotection strategies in seedlings of the two species Methods Three light regimes of 100%, 56.2% and 12.5% of natural light were simulated to match forest openings, forest gaps and forest canopies, respectively. After more than three months, we measured the parameters of gas exchange, including maximum net photosynthetic rate (Pmax), light saturation point (LSP), light compensation point (LCP), net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), intercellular CO2 concentration (Ci), fluorescent non-photochemical quenching (NPQ), maximum efficiency of PSII photochemistry (Fv/Fm) and light use efficiency (LUE), using a LI-6400 in seedling leaves. We also determined pigment contents per unit leaf area, lamina mass per unit area (LMA) and activity of antioxidant enzymes (superoxide dismutase, catalase and ascorbate peroxidase). Important findings LMA, carotenoid content (Cars), ratio of carotenoid to total chlorophyll (Car/Chl) and activities of superoxide dismutase, catalase and ascorbate peroxidase in leaves increased with the increase of light intensities. Pmax, LSP, LCP and NPQ tended to increase, while the chlorophyll content (Chl) and LUE decreased. However, the Ci decreased with the increase of Pn, Gs and stomatal limitation value (Ls). We speculated that non-stomatal limitation was the main factor that inhibited Pn. Seedlings of the two alder species could acclimate to different light regimes in this study through changing of physiological and morphological traits. Under all light regimes, diurnal photoinhibition of photosynthesis, as judged by Fv/Fm, was significantly more severe in A. cremastogyne than in A. formosana. The acclimation capacity to high light regime was stronger in A. formosana than in A. cremastogyne. With the increase of light intensities, Pmax and antioxidant enzyme activities increased significantly, but not NPQ in A. formosana. The opposite trends occurred in A. cremastogyne. At the same light intensity, thermal dissipation was much lower, but Pmax was much higher in A. formosana than in A. cremastogyne. These results indicated that A. formosana seedlings might adapt resistance to photoinhibition through improving the use of solar energy by higher Pmax and antioxidant enzyme system, while A. cremastogyne seedling avoided photoinhibition mainly through converting excess light energy to heat energy in the form of non-radiative dissipation through the antenna system.
Design of a Flow-through Polarographic Sensor Based on Metal Films for Determining N-nitrosodiethanolamine Levels in Rabbit Biological Fluids
Lai-Hao Wang,Hung-Chang Hsia,Yuan-Zhi Lan
Sensors , 2006, DOI: 10.3390/s6111555
Abstract: The construction and characterization of a flow-through polarographic detectorfor catalyzing the electroreduction of N-nitrosodiethanolamine (NDELA), is discussed. Theflow-through cell is equipped with a gold wire electrode (a thin mercury film deposited on agold substance). The response is evaluated with respect to substance diameter, length,concentration of modifying film, operating potential, supporting electrolyte and pH, andflow rate in the DC mode. The system allows the determination of N-nitrosodiethanolaminein rabbit biological fluids with relatively inexpensive equipment.
Effects of Parecoxib and Fentanyl on nociception-induced cortical activity
Yuan-Zhi Peng, Xiao-Xi Li, Ying-Wei Wang
Molecular Pain , 2010, DOI: 10.1186/1744-8069-6-3
Abstract: Peripheral nociceptive stimulation in anesthetized rats produced an immediate electroencephalogram (EEG) desynchronization resembling the cortical arousal (low-amplitude, fast-wave activity), while the membrane potential switched into a persistent depolarization state. The induced cortical activity was abolished by fentanyl, and the fentanyl's effect was reversed by the opioid receptor antagonist, naloxone. Parecoxib, on the other hand, did not significantly affect the neural activity.Cortical activity was modulated by nociceptive stimulation in anesthetized rats. Fentanyl showed a strong inhibitory effect on the nociceptive-stimulus induced cortical activity while parecoxib had no significant effect.Pain is a complex subjective sensory experience which is comprised of sensory discrimination, cognitive appreciation and affective motivation components [1]. The treatment of pain is a fundamental issue in the practice of anesthesia. However, the mechanisms of pain and analgesia are unclear. With the development of imaging technology (e.g., functional magnetic resonance imaging and positron emission tomography), cortical areas that are commonly activated by noxious stimuli have been illuminated. These areas include the primary and secondary somatosensory cortices (S1, S2), anterior cingulate cortex (ACC), insular cortex and motor cortex [2,3]. Electrophysiological studies show that cortical neuronal activity under anesthesia is associated with an Up-Down membrane potential fluctuation, while EEG signals are characterized by large-amplitude and slow-wave activity [4-6]. It is well known that synapses are highly plastic in the central nervous system including ACC, and that long-term changes in synaptic transmission contribute to different functions of brain including chronic pain. Long-term potentiation (LTP) is believed to the basis of learning and memory, and it can also be induced by different protocols or peripheral injury at the spinal cord dorsal horn [7,8]. Elucida
The Emphases and Basic Procedures of Genetic Counseling in Psychotherapeutic Model

ZHANG Yuan-Zhi,Nanbert ZHONG,
,Nanbert ZHONG

遗传 , 2006,
Abstract: The emphases and basic procedures of genetic counseling are all different with those in old models. In the psychotherapeutic model, genetic counseling will not only focus on counseiees' genetic disorders and birth defects, but also their psychological problems. "Client-centered therapy" termed by Carl Rogers plays an important role in genetic counseling process. The basic procedures of psychotherapeutic model of genetic counseling include 7 steps: initial contact, introduction, agendas, inquiry of family history, presenting information, closing the session and follow-up.
N′-(4-Methoxybenzylidene)-4-nitrobenzohydrazide methanol solvate
Yuan-Zhi Wang,Ming-Dong Wang,Yun-Peng Diao,Qian Cai
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808005813
Abstract: The title compound, C15H13N3O4·CH4O, was synthesized from the reaction of 4-methoxybenzaldehyde with 4-nitrobenzohydrazide in methanol. The benzene rings of the Schiff base molecule are nearly coplanar, making a dihedral angle of 7.0 (3)°. The methanol solvent molecules are linked to the Schiff base molecules by N—H...O, O—H...N and O—H...O hydrogen bonds, forming chains running parallel to the b axis.
Stochastic resonance in the growth of a tumor induced by correlated noises
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2005,
Abstract: Multiplicative noise is found to divide the growth law of tumors into two parts in a logistic model, which is driven by additive and multiplicative noises simultaneously. The Fokker-Planck equation was also derived to explain the fact that the influence of the intensity of multiplicative noise on the growth of tumor cells has a stochastic resonance-like characteristic. An appropriate intensity of multiplicative noise is benefit to the growth of the tumor cells. The correlation between two sorts of noises weakens the stochastic resonance-like characteristic. Homologous noises promote the growth of the tumor cells.
Noise-induced first-order transition in anti-tumor immunotherapy
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2005,
Abstract: We studied the single-variable dynamics model of the tumor growth. A first-order phase transition induced by an additive noise is shown to reproduce the main features of tumor growth under immune surveillance. The critical average cells population has a power-law function relationship with the immune coefficient.
Influence of Correlated Noises on Growth of a Tumor
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2005,
Abstract: We studied the effect of additive and multiplicative noises on the growth of a tumor based on a logistic growth model. The steady-state probability distribution and the average population of the tumor cells were given to explain the important roles of correlated noises in the tumor growth. We found that multiplicative noise induces a phase transition of the tumor growth from an uni-stable state to a bi-stable state; the relationship between the intensity of multiplicative noise and the population of the tumor cells showed a stochastic resonance-like characteristic. It was also confirmed that additive noise weakened rather than extinguish the tumor growth. Homologous noises, however, promote the growth of a tumor. We also discussed about the relationship between the tumor treatment and the model.
Spatiotemporal Fluctuation Induced Transition in a Tumor Model with Immune Surveillance
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2006, DOI: 10.1103/PhysRevE.74.011916
Abstract: We report on a simple model of spatial extend anti-tumor system with a fluctuation in growth rate, which can undergo a nonequilibrium phase transition. Three states as excited, sub-excited and non-excited states of a tumor are defined to describe its growth. The multiplicative noise is found to be double-face: The positive effect on a non-excited tumor and the negative effect on an excited tumor.
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