Abstracts Keynote & Plenary

Seasonal trade-off between water- and nitrogen-use efficiency of constructive plants in desert
riparian forest in hyperarid region of China
Shengkui Cao1 Qi Feng,2 Jianhua Si2, Yonghong Su2, Zongqiang Chang2, Haiyang Xi2
1.Division of Hydrology and Water-land Resources in Cold and Arid regions, Cold and Arid
Regions
Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lan Zhou 730000;
Biological and Geographical Sciences Institute , the Qinghai Normal University, XiNing, 810008 china
2.Division of Hydrology and Water-land Resources in Cold and Arid regions, Cold and Arid Regions
Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lan Zhou, 730000
china
E-mail: shkc@lzb.ac.cn
Foliar δ13C values were used
to denote the long-term water use efficiency (WUE) of plants whereas
long-term nitrogen use efficiency (NUE) was estimated by the ratio of C to N. Seasonal variations of
δ13C values, foliar nitrogen concentrations and C/N ratios of P.euphratica and T.ramosissima grown
under five different plots of Ejina desert riparianoasis of northwestern arid regions in china were
studied. The results indicated that T.ramosissima had higher δ13C values, with the mean values of
±
-26.66 0.12‰ compared with P.euphratica. The N concentrations and C/N ratios of two species were
not significantly different. The seasonal pattern of three indexes in two species was similar. The δ13C
values and N concentrations were decreased with the growth period advancing. But the change of C/N
ratios was decline. Among plots, there were higher δ13C values and N concentrations as well as lower
C/N ratios in the Dune and Gobi. Foliar δ13C values were significantly and positively correlated with
N concentrations in P.euphratica and T.ramosissima, whereas significantly negative correlation between
δ13C values and C/N ratios was found for P.euphratica, this relation in T.ramosissima was weak, but
there was significantly quadratic curve relationship between δ13C values and C/N ratios, revealed that
there was a trade-off between WUE and NUE for P.euphratica and in natural condition, which
P.euphratica could not improve WUE and NUE simultaneously. The cost of a high WUE was a low
NUE, and vice versa. But the T.ramosissima could simultaneously enhance WUE and NUE. Those
reflected the different adaptations of desert species to environmental condition.
Design
of PID Controller Based on DNA Computing
Huang Yourui, Tian Yiming, Yin Zhixiang
Anhui University of Science and Technology Huainan 232001, China
hyr628@163.com
The biological Deoxyribonucleic acid (DNA) strand is found to be a promising computing unit.
DNA computing is attracted as one method which gives us suitable answers for optimization
problems. Proportional Integral Derivative (PID) control schemes have been widely used in
industrial fields. Since the PID parameters have a great influence on the stability and
performance of the control system, many approaches have been proposed to determine them.In
this article, we propose double helix structured DNA algorithms to design the type of PID
controller and optimize the PID parameters. The structure of DNA computing is provided, it is
applied into the optimal design of PID controller system. A computer simulation shows that we
can get satisfactoty results with the proposed methodMolecular cloning, characterization and
expression analysis of 3-hydroxy-3-methylglutoryl-Coenzyme A reductase (HMGR) from Panax
ginseng