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Effects of irrigation and planting patterns on photosynthetic capacity and grain quality of winter wheat

100%

Zhao Y. X. , Mao X. M. , Yong Y. Y. , Zhou X. B.

International Agrophysics

2019

tom 33

nr 3

Fabrication of low loss optical waveguides with a novel thermo-optical polymer material

88%

Zhou J. , Wong W. H. , Pun E. Y. B. , Shen Y. Q. , Zhao Y. X.

Optica Applicata

2006

tom Vol. 36, nr 2-3

429-435

The newly synthesized polymer, bisphenol A-aldehyde resin (BPA-resin) has many unique thermo-optical characteristics. The polymer has high transparency, relatively high refractive index, low birefringence, and large thermo-optics coefficient at the optical telecommunication wavelengths. Also, the single-mode channel waveguides have been fabricated using BPA-resin polymer. The experimental results show, that the polymer waveguide has a low propagation loss of 0.43 and 0.51 dB/cm at a wavelength of 1.31 and 1.55 m, respectively, for both TE and TM polarizations. The low polarization dependence loss (PDL) of the waveguide was less than 0.1 dB/cm at above wavelengths, which can be applied in thermal-optical tuned devices.

Dynamic change of metabolites and nutrients in suspension cells of Panax Quinquefolium L. in bioreactor

75%

Wang J. , Gao W. Y. , Zhang J. , Huang T. , Cao Y. , Zhao Y. X.

Acta Physiologiae Plantarum

2010

tom 32

nr 3

In order to understand how the nutrient elements were taken up during the cell growth as well as the production of metabolites, it was quite necessary to identify the dynamic change of metabolites and nutrients in suspension cells of Panax quinquefolium in bioreactor. In this study, dynamic accumulation of biomass and ginsenosides Re, Rb1 and polysaccharide as well as major nutrients consumption in cell suspension culture of P. quinquefolium in a 5-L stirred tank bioreactor were investigated. The dry cell weight and the contents of ginsenosides Re, Rb1 and polysaccharide reached the maximum peak simultaneously on about 21 days and the results showed that cell growth and metabolites synthesis related to nutrients consumption. For this reason, we supposed that the contents of metabolites can be increased through added nutrient at the right moment. These results provided theory reference for two-stage or continuous perfusion culture in suspension cells of P. quinquefolium in bioreactor.

Selection and optimization of a high-producing tissue culture of Panax ginseng C. A. Meyer

75%

Huang T. , Gao W. Y. , Wang J. , Cao Y. , Zhao Y. X. , Huang L. Q. , Liu C. X.

Acta Physiologiae Plantarum

2010

tom 32

nr 4

Biomass growth, ginsenoside and polysaccharide production in different ginseng tissue cultures, including callus culture, adventitious root culture and hairy root culture, were studied, and the active component contents were compared with that of native ginseng roots. The adventitious root culture was confirmed to be a very nice system, which grew fast and contained a rather high content of ginsenosides. Then, the culture conditions of adventitious root culture were optimized. The results showed that salt strength, various sucrose concentrations, ammonia/nitrate ratios and phosphate concentrations had significant influences on adventitious roots growth, secondary metabolite and polysaccharide synthesis in ginseng. The best culture conditions for ginsenoside production seemed to be 0.75 salt strength Murashige and Skoog medium, 4% sucrose, 9 mM ammonia to 36 mM nitrate, and 1.25 mM phosphate, while the optimization for polysaccharide accumulation seemed to be 0.75 salt strength, 6% sucrose, 9 mM ammonia to 36 mM nitrate and 3.75 mM phosphate source. Appropriate conditions allowed for a maximum ginsenoside yield of up to 132.90 mg/L and polysaccharide yield of 407.63 mg/L to be obtained after 4 weeks of culture.