Authors:H. Zhao, S. Bennici, J. Shen, and A. Auroux
The surface acidic properties of sulfated vanadia–titania catalysts prepared by various methods were investigated by adsorption
microcalorimetry, using ammonia as probe molecule. The acidic characteristics of the samples were shown to be strongly affected
by the preparation method, calcination temperature, and sulfur content. The samples prepared by sol–gel and mechanical grinding
exhibited higher acidity than co-precipitated samples. Moreover, increasing the calcination temperature of co-precipitated
samples resulted in a decrease in surface area from 402 to 57 m2 g−1 and sulfur content from around 4 to 0.2 mass%, but up to a certain point generated a stronger acidity. The optimal calcination
temperature appeared to be around 673 K.
Authors:X. Lu, X. Tian, A. Zhao, J. Cui, and X. Yang
To investigate the effect of Zn fertilization on soil Zn fractions and grain Zn concentration in wheat grown on potentially Zn-deficient soil, a field experiment was carried out. The experimental design was split plot consisted of two varieties of wheat (Zhengmai 9023 and Xinong 889) with five Zn levels (0, 7.5, 15, 30 and 45 kg Zn/ha). Results showed that Zn fertilization had no significant effect on wheat yield and grain Zn concentration, and the recovery of Zn fertilizer was only 0.06% to 0.29%. However, the amount of soil DTPA-Zn was increased by 2.3-9.8-folds as Zn supplementation increases during the whole wheat growth stage as compared to the control (Zn0 treatment). Besides, DTPA-Zn was positively correlated with both Loose organic matter bound Zn (LOM-Zn) and Exchange Zn (Ex-Zn), and their partial correlation coefficients were 0.558 and 0.119, respectively. Moreover, these two fractions also showed positive correlation with grain Zn concentration. The amount of LOM-Zn was firstly increased with increasing Zn fertilizer levels then gradually decreased as it get converted to mineral bound Zn (Min-Zn). Zn fertilization in this potentially Zn deficient soil increased the amount of DTPA-Zn in the whole wheat growth stage; however, grain Zn concentration cannot be significantly increased as Zn levels increase, thus suggesting that there are inhibitory factors for Zn absorption and translocation. Furthermore, the amount of soil DTPA-Zn perhaps cannot exactly reflect the capability of soil to supply Zn.
Authors:H.Q. Zhao, L. Wang, J. Hong, X.Y. Zhao, X.H. Yu, L. Sheng, C.Z. Hang, Y. Zhao, A.A. Lin, W.H. Si, and F.S. Hong
Salt stress impaired Mn imbalance and resulted in accumulation of ROS, and caused oxidative stress to plants. However, very little is known about the oxidative damage of maize roots caused by exposure to a combination of both salt stress and Mn deprivation. Thus the main aim of this study was to determine the effects of a combination of salt stress and Mn deprivation on antioxidative defense system in maize roots. Maize plants were cultivated in Hoagland’s media. They were subjected to 80 mM NaCl administered in the Mn-present Hoagland’s or Mn-deficient Hoagland’s media for 14 days. The findings indicated that the growth and root activity of maize seedlings cultivated in a combination of both salt stress and Mn deprivation were significantly inhibited; the compatible solute accumulation, malondialdehyde, carbonyl, 8-OHdG, and ROS were higher than those of the individual salt stress or Mn deprivation as expected. Nevertheless, the antioxidative enzymes such as superoxide dismutase, ascorbate peroxidase, glutathione reductase, glutathione-S-transferase and antioxidants such as ascorbic acid, glutathione and thiol were lower than those of the individual salt stress or Mn deprivation. In view of the fact that salt stress impaired Mn nutrition of maize seedlings, the findings suggested that Mn deprivation at the cellular level may be a contributory factor to salt-induced oxidative stress and related oxidative damage of maize roots.
Authors:X. Yang, X. Tian, W. Gale, Y. Cao, X. Lu, and A. Zhao
Three field experiments were conducted to determine the effect of soil Zn, foliar Zn, and soil N application on Zn and phytic acid concentrations in wheat grain grown on potentially Zn-deficient soil. Results showed significant genotypic variation in grain Zn concentrations among fifteen wheat cultivars commonly grown in northwest China. Soil Zn application had mixed effects, increasing grain Zn concentrations of some cultivars by as much as 21%, but reducing grain Zn concentrations of other cultivars by as much as 14%. In comparison, foliar Zn application increased grain Zn concentrations by 26 to 115%. Grain Zn concentrations were 14% larger in the combined (foliar Zn + soil Zn) treatment compared to the foliar Zn treatment, but the added cost of soil Zn application may not be economically justifiable. Wheat grain phytic acid concentrations and phytic acid: Zn molar ratios were less in the foliar Zn and (foliar Zn + soil Zn) treatments compared to the soil Zn and the unfertilized treatments. This indicated that foliar Zn increased Zn bioavailability. Best results were obtained when foliar Zn was applied at early grain filling. Overall, these findings indicate that foliar Zn application to Zn-efficient cultivars could reduce human Zn deficiency in regions with potentially Zn-deficient soil.
Authors:W. Xue, A. Gianinetti, Y. Jiang, Z. Zhan, L. Kuang, G. Zhao, J. Yan, and J. Cheng
The cereal endosperm provides nutrients for seedling growth. The effects of seed components in seedling establishments under salt stress are, however, not yet fully explored. In this study, 60 barley recombinant inbred lines derived from Lewis × Karl cross were grown in four different environments, and the seed contents of starch, total soluble protein, phytate, total phenolics, total flavonoids and total inorganic phosphorus were determined in the harvested grains. Seeds of each line from the four environments were also assayed for seedling growth under saline treatments from 0 to 400 mM NaCl. Root and shoot lengths after 7 days decreased with increasing salt concentration. Correlations between seed components and either root or shoot length were established across the four seed sources. ANOVA showed a significant environment/source effect for both seed components and seedling growth, although the latter was less affected by the seed-production environment. Modeling seedling length across multiple salinities for each seed source showed that the environment with the most saline-tolerant root-growth curve was that associated the highest seed phosphorus content. Correlations between seed components and seedling growth traits highlighted phytate and total inorganic phosphorus as key components for seedling growth under moderate salinities. Seed phytate contents benefited seedling growth, even at high salinities, suggesting an additional role for this seed component under stressful growth conditions, possibly linked to its potential function as an osmolyte source.
Authors:A. He, M. Ye, Z. Tang, S. Lu, Y. Gu, X. Fan, L. Zhao, and J. Gao
The recombination of hydrogen and oxygen in technical gaseous waste of nuclear power plants in enlarged scale experiment has
been studied on the basis of our previous work.1 The catalyst and its best operating conditions for recombination of hydrogen and oxygen determined in a small scale experiment
were demonstrated and tested. The results show that the data obtained in an enlarged scale experiment agreed well with that
of in a small scale test. The recombination rate of H2 and O2 was higher than 98.3% and 99.98% respectively. After recombination, the residual concentrations of H2 and O2 in waste gas were O2<3 ppm, H2<400 ppm. The Pd-Al2O3 catalyst and operating conditions determined for gaseous waste processing of nuclear power plants were satisfactory.
Authors:D. Kaji, K. Morita, K. Morimoto, Y. Zhao, A. Yoneda, T. Suda, A. Yoshida, H. Kudo, K. Katori, and I. Tanihata
A gas-filled recoil separator for heavy element research was installed at the experimental hall of RIKEN linear accelerator facility. An acceptance of the separator was measured using a-particles from 241Am source. Measured acceptance was 12.2 msr. Transmissions of the separator were measured with low-energy Pb (0.26 AMeV) and Bi (0.11 AMeV) recoils. It was found that the transmission for Pb (0.26 AMeV) was 0.84, and that for Bi (0.11 AMeV) was 0.33. Equilibrium charge states for Pb and Bi in helium gas were deduced.
Authors:R. C. Moore, M. Gasser, N. Awwad, K. C. Holt, F. M. Salas, A. Hasan, M. A. Hasan, H. Zhao, and C. A. Sanchez
The MARC-VI conference served as an excellent setting for a session organized to present and discuss the problems in nuclear science manpower and education. A panel discussion and contributed papers reflected the world-wide situation. This paper presents the major points of the panel discussion. As a result, a resolution on the current situation of nuclear chemistry and radiochemistry was drafted and endorsed by the conference attendees.
Authors:F. McDaniel, S. Matteson, J. Anthony, D. Weathers, J. Duggan, D. Marble, I. Hassan, Z. Zhao, A. Arrale, and Y. Kim
An Accelerator Mass Spectrometry (AMS) facility has been assembled at the University of North Texas (UNT) in collaboration with Texas Instruments, Inc. The UNT AMS facility is used primarily for the high sensitivity determination of trace elements of stable isotopes in materials. Particle accelerators, in conjunction with magnetic (momentum/charge) and electrostatic (energy/charge) spectrometers and particle energy detectors, may be used to measure rare isotopes at concentrations as low as one part in 1012 or 1010 atoms/cm3.
Authors:F. Cui, J. Li, A. Ding, C. Zhao, X. Li, D. Feng, X. Wang, L. Wang, and H. Wang
To comprehensively understand the genetic basis of plant height (PH), quantitative trait locus (QTL) analysis for internode lengths, internode component indices and plant height component index (PHCI) were firstly conducted in the present study. Two related F8:9 recombinant inbred line (RIL) populations comprising 485 and 229 lines were used. Two hundred and nine putative additive QTL for the eight traits were identified, 35 of which showed significance in at least three trials. Of these, at least 11 pairwise QTL were common to the two populations. PH components at the QTL level had different effects on PH, confirming our previous multivariate conditional analysis (Cui et al. 2011). Eleven major QTL that showed consistency in expression across environments should be of great value in the genetic improvement of PH in wheat. The results above will enhance the understanding of the genetic basis of PH in wheat.