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Search Results: 1 - 10 of 81323 matches for " Hongmei Liu "
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Isolation and Identification of Yeasts from Luzhou Flavor Daqu  [PDF]
Xinzhi Cao, Jianming You, Hongmei Ming, Jia Liu, Linsheng Ren
Advances in Microbiology (AiM) , 2015, DOI: 10.4236/aim.2015.55030
Abstract: A yeast strain had been isolated by dilution-plate from the Daqu samples in our study. The strain was identified as a strain of Rhodotorula aurantiaca through observation of its morphological features, micromorphological observation and biolog identification system.
Effects of Nitrogen Addition on the Mixed Litter Decomposition in Stipa baicalensis Steppe in Inner Mongolia  [PDF]
Wenya Li, Wenchao Yu, Long Bai, Hongmei Liu, Dianlin Yang
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.73048
Abstract: During the past two centuries, global changes (i.e., enhanced nitrogen deposition) have exerted profound effects on ecological processes of steppe ecosystems. We used litterbag method and mixed litters of three different plant species tissues (Stipa baicalensis: Sb, Leymus chinensis: Lc and Artemisia frigid: Af), endemic to Stipa baicalensis Steppe, and measured the mass loss of mixtures over 417 days under the N addition treatment. We studied the effect of N addition (N0: no N addition; N15: 1.5 g N/m2·a; N30: 3.0 g N/m2·a; N50: 5.0 g N/m2·a; N100: 10.0 g N/m2·a; N150: 15.0 g N/m2·a) on the rate of mixed litter decomposition and nutrient dynamics change. The decomposition constant (k) of leaf mixtures was higher than that of root mixtures. The k values of leaf mixed combinations were 0.880 (Sb + Lc), 1.231 (Lc + Af), 1.027 (Sb + Lc + Af), respectively. The k value of stem was 0.806 (Lc + Af) and the root mixed combinations were 0.665 (Sb + Lc), 0.979 (Lc + Af) and 1.164 (Sb + Lc + Af), respectively. The results indicated that N addition had significantly effect on the mixed litter decomposition and nutrient releasing. The rate of plant tissues litter decomposition had different response to N addition. In the context of N addition, litter decomposition rate and nutrient dynamics were changed by synthetic effect of decaying time, specie types and N addition dose. Our findings suggested that prairie plants may adapt to environmental change by adjusting litter quality, thus retaining the stability of the steppe ecosystem.
The Physiological Basis of Heterosis for Potassium Uptake of Hybrid Millet  [PDF]
Zihui Liu, Binhui Liu, Hongmei Zhang, Guoliang Li, Yanmin Zhang, Xiulin Guo
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513215
Abstract:

Hybrid millet Zhang and its parental cultivars were studied for their potassium (K) uptake and accumulation characteristics and related physiological mechanisms. Hydroponic culture was performed with two K levels (i.e., high and low) set up. At high K level, hybrid millet showed heterobeltiosis in K accumulation and leaf K content, and it also had higher H+-ATPase activity, respiration rate, root oxidant activity and root K+ influx rate than its parental cultivars. All these lay the physiological foundation of heterosis for potassium uptake of hybrid millet. At low K level, the hybrid millet had a lower H+-ATPase activity and a higher K efflux rate than its parental cultivars, thus heterobeltiosis in K accumulation or leaf K content was not observed. Therefore, high level K fertilizer application is recommended for hybrid millet cultivation as it is favorable for hybrid millet to display heterosis in K uptake and K accumulation.

Impacts of Four Invasive Asteraceae on Soil Physico-Chemical Properties and AM Fungi Community  [PDF]
Xinwei Chen, Yuxiao Liu, Hongmei Liu, Hui Wang, Dianlin Yang, Chaohe Huangfu
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.617274
Abstract: Invasive Asteraceae are an important group of plants and might have universal impacts on invaded ecosystems. However, research data on the ecological impacts of specific plants are still lacking. Chromolaena odorata, Ageratina adenophora, Flaveria bidentis, and Mikania micrantha are four typical alien Asteraceae in China. The involvement of soil biota, in particular, the community structure of arbuscular mycorrhizal (AM) fungi in their invasion process was tested in present research. It was found that invasion by the four Asteraceae changed, to different extents, the nutrient levels in soils. Invasion by C. odorata, A. adenophora, and F. bidentis followed common patterns: 1) decreasing pH value; 2) increasing the soil AM fungal diversity and species richness. Invasion by all four Asteraceae tested increased nitrogen pools and accelerated nitrogen fluxes with a decrease in the phosphorus pool, especially available phosphorus. It was suggested that mycorrhizal symbiosis might partially promote successful invasion of these Asteraceae by affecting the metabolism of phosphorus in soil. The impacts on soil ecosystems of these Asteraceae tested were also species-specific, and different invasion strategies were exhibited.
Clinical Practice Examples of Dachaihu Decoction  [PDF]
Hongmei Zhu
Chinese Medicine (CM) , 2013, DOI: 10.4236/cm.2013.42007
Abstract:

This paper mainly describes the experiences of clinical application of Dachaihu Decoction in treating chronic pelvic infection, coronary heart disease, insomnia, and hepatolithiasis.

Looking Back at the New Knowledge Bases of EFL Teacher Education  [PDF]
Hongmei Zhu
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.412106
Abstract: This article discusses the trend of reconceptualizing EFL teachers’ knowledge base to avoid the separation between theory and practice, which is in particular reflected on the establishment of some new EFL teachers’ knowledge domains. However, the horizontal categorizing approaches of teachers’ knowledge establish another gap between theory and practice and the hierarchical approach formulates so much abstract knowledge for teachers. The construct of knowledge of EFL classroom interaction is a pilot inquiry to create an interface between “theory knowledge” and “practice knowledge” from the teachers’ needs. In the end of the article, a rough knowledge framework is constructed for EFL classroom interaction on teachers’ needs.
On a System of Second-Order Nonlinear Difference Equations  [PDF]
Hongmei Bao
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.37110
Abstract: This paper is concerned with dynamics of the solution to the system of two second-order nonlinear difference equations \"\", \"\", \"\", where \"\", \"\", \"\", i = 0, 1. Moreover, the rate of convergence of a solution that converges to the equilibrium of the system is discussed. Finally, some numerical examples are considered to show the results obtained.
Learning Opportunity and EFL Teachers’ Questions  [PDF]
Hongmei Zhu
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.43027
Abstract: As postmethod EFL teaching method was proposed in 1999, ideas on teaching and learning be-came unthinkably various and dynamic. The views on teachers’ questions also changed a lot in postmethod period. The term of learning opportunity bridged teaching and learning in this situation. This article aims to explore the way that an expert teacher, an experienced teacher and a novice teacher provide learning opportunities for the students in their question-answer sequences. A CA approach is used to analyze three teachers’ questions based on four different students’ first responses: Right Answer, Partly Right Answer, Incomplete Answer and Refusal Answer. The results suggest that the expert teacher can provide more learning opportunities by strengthening students’ identities, extending students’ contributions, attracting students’ involvement and there is an insignificant relation between the type of questions and learning opportunities. It is suggested that EFL teachers can be more aware of the local and dynamic teaching context and promote more negotiation of meaning and students’ involvement.
Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity
Liu Cheng,Gaetz William,Zhu Hongmei
EURASIP Journal on Advances in Signal Processing , 2010,
Abstract: Time-varying coherence is a powerful tool for revealing functional dynamics between different regions in the brain. In this paper, we address ways of estimating evolutionary spectrum and coherence using the general Cohen's class distributions. We show that the intimate connection between the Cohen's class-based spectra and the evolutionary spectra defined on the locally stationary time series can be linked by the kernel functions of the Cohen's class distributions. The time-varying spectra and coherence are further generalized with the Stockwell transform, a multiscale time-frequency representation. The Stockwell measures can be studied in the framework of the Cohen's class distributions with a generalized frequency-dependent kernel function. A magnetoencephalography study using the Stockwell coherence reveals an interesting temporal interaction between contralateral and ipsilateral motor cortices under the multisource interference task.
Estimation of Time-Varying Coherence and Its Application in Understanding Brain Functional Connectivity
Cheng Liu,William Gaetz,Hongmei Zhu
EURASIP Journal on Advances in Signal Processing , 2010, DOI: 10.1155/2010/390910
Abstract: Time-varying coherence is a powerful tool for revealing functional dynamics between different regions in the brain. In this paper, we address ways of estimating evolutionary spectrum and coherence using the general Cohen's class distributions. We show that the intimate connection between the Cohen's class-based spectra and the evolutionary spectra defined on the locally stationary time series can be linked by the kernel functions of the Cohen's class distributions. The time-varying spectra and coherence are further generalized with the Stockwell transform, a multiscale time-frequency representation. The Stockwell measures can be studied in the framework of the Cohen's class distributions with a generalized frequency-dependent kernel function. A magnetoencephalography study using the Stockwell coherence reveals an interesting temporal interaction between contralateral and ipsilateral motor cortices under the multisource interference task.
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