Authors:Juan Zhang, Feng-Tian Hu, Qian-Qian Liu, Xin Zhao, and Shou-Qing Liu
A heterogeneous photo-Fenton catalyst was prepared using the complex tris(1,10)-phenanthroline iron(II) loaded on the NaY type of zeolite. The catalyst displayed a feature of the photo-Fenton degradation of methylene blue, and a linear relationship between ln(C0/Ct) and reaction time was obtained, indicating the kinetic characteristics of a pseudo first-order reaction. The repeated cyclic experiments showed that the heterogeneous catalyst was stable and recoverable. Compared with the traditional homogeneous Fenton reagent, the heterogeneous catalyst has the advantage in the neutral or weakly basic medium used because the active component tris(1,10)-phenanthroline iron(II) is a stable chelate compound. The photo-Fenton degradation pathway for methylene blue was given based on the mass spectral data.
Authors:Sun Tong-Shan, Xiao Yu-Mei, Wang Da-Qing, Wang Feng-Lian, and Zhao Yu-Ting
The complexes of rare earth bromides with alanine, REBr33AlanH2O (RE=Ce, Pr, Sm, Eu, Gd and Tb, n=3; RE=Dy and Y, n=2.5
Ala=alanine), were prepared and characterized by means of chemical analysis, elemental analysis, molar conductivity, thermogravimetry,
IR spectra and X-ray diffraction. The thermal decomposition in N2 of these complexes was studied by means of TG-DTG techniques
from ambient temperature to 1000C. During heating, the hydrated complexes of Ce, Pr and Y lose waters in one step, but the
hydrated complexes of Sm, Eu, Gd, Tb and Dy lose waters in two steps. Then anhydrous complexes lose 2.5 alanine molecules
except the complexes of Eu which lose three alanine molecules. Apparently, only be complex of Eu has an intermediate, EuOBr.
All complexes finally decompose to oxides.
Authors:X. He, Z. Zhang, L. Feng, Z. Li, J. Yang, Y. Zhao, and Z. Chai
After an acute exposure to lanthanum chloride, the pharmacokinetics of calcium uptake in rats was studied by radioactive 47Ca tracer. The accumulated doses of calcium in the left femurs during 24 hours were determined. The results showed that the
area under the curves (AUC), specific activity of maximal blood 47Ca concentration (Cmax), distribution rate constant (Ka) and the accumulated dose of calcium in the left femur decreased while time to Cmax (Tpeak) increased with the rising dosage of lanthanum exposure. It indicated that lanthanum expose had a negative effect on calcium
Authors:C. Zhang, Y. Zhao, S. Feng, C. Qi, Z. Fu, F. Guo, and R. Wang
To increase the tumor uptake of Val-Gly-Gly (VGG), adenine was introduced into the peptide. N-mercaptoacetyl-VGG-adenine (MAVGG-adenine)
and MAVGG were labeled with 99mTc using a solution of SnCl2 and tartaric acid as reducing agent. Biodistribution in mice bearing the S180 tumor was measured and γ imaging was performed.
Compared with MAVGG, adenine conjugated MAVGG had higher tumor uptake and tumor to normal tissue ratios, which suggested that
the tumor uptake property of a peptide may be improved by introducing a nucleotide base. The high contrasted tumor images
of 99mTc-MAVGG-adenine also suggested its potential utility as tumor imaging agent.
Authors:B. Feng, Z.B. Xu, X. Wang, F. Jiang, G.J. Zhao, C. Xiang, and T. Wang
High molecular weight (HMW) glutenin subunits are important seed storage proteins in wheat and its related species. Novel HMWglutenin subunits in Aegilops tauschii accession of TA2484 were detected and characterized. SDS-PAGE analysis revealed the y-type subunit from TA2484 displayed similar electrophoretic mobility compared to that of 1Dy12 subunit. However, the electrophoretic mobility of x-type subunit was faster than that of 1Dx2 subunit. The primary structure of the two cloned subunits from TA2484 was similar to that of the x- and y-type subunits reported before. However, the 148 residues of the x-type subunit, which contained the sequence element GHCPTSLQQ, in the middle of the repetitive domain was quite different from other x-type subunits. Moreover, the 68 residues in this region were identical to those of the y-type subunits from the same accession. Consequently, 1Dx2.3*t (x-type subunit of TA2484) contains an extra cystenin residue located at the repetitive domain, which is novel compared to the x-type subunits reported so far. Phylogenetic analysis indicated that two subunits from accession TA2484 were in the x- and y-type subunit cluster, but bootstrapping value of 100% gave high support for the spilt between two subunits (1Dx2.3*t and 1Dy12.3*t) and their alleles, respectively. A hypothesis on the genetic mechanism generating this novel sequence of 1Dx2.3*t subunit is suggested.
Authors:Y. Zhao, C. Zhang, C. Qi, S. Feng, G. You, Z. Fu, F. Guo, and R. Wang
Two peptide ligands conjugated adenine, [9-N-(tritylmercapto acetyl diglycyl aminoethyl) adenine, Tr-MAG2-Ade] and [9-N-(tritylmercapto acetyl triglycyl aminoethyl) adenine, Tr-MAG3-Ade], are synthesized and labeled with 99mTc by directly labeling method. The stability of 99mTc-MAG2-adenine and 99mTc-MAG3-adenine in vitro is measured. The uptake radios of tumor to muscle at 3h post-injection are 5.70 and 4.92, respectively.
The biodistribution and scintigraphic imaging studies show that the two complexes have high localization in tumor and high
contrasted tumor images can be obtained, which suggest their potential utility as tumor imaging agents. But the high radioactivity
of abdomen could prevent the tumor imaging in this area.
Authors:Li Bai Xiao, Xiao Ling Xing, Xue Zhong Fan, Feng Qi Zhao, Zhi Ming Zhou, Hai Feng Huang, Ting An, Hai Xia Hao, and Qing Pei
The enthalpies of dissolution for di(N,N-di(2,4,6,-trinitrophenyl)amino)-ethylenediamine (DTAED) in dimethyl sulfoxide (DMSO) and N-methyl pyrrolidone (NMP) were measured using a RD496-2000 Calvet microcalorimeter at 298.15 K. Empirical formulae for the calculation of the enthalpies of dissolution (ΔdissH) were obtained from the experimental data of the dissolution processes of DTAED in DMSO and NMP. The linear relationships between the rate (k) and the amount of substance (a) were found. The corresponding kinetic equations describing the two dissolution processes were for the dissolution of DTAED in DMSO, and for the dissolution of DTAED in NMP, respectively.
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.
Authors:L. Wang, F. Cui, A. Ding, J. Li, J. Wang, C. Zhao, X. Li, D. Feng, and H. Wang
A recombinant inbred line (RIL) population with 302 lines derived from a cross of Weimai 8 × Luohan 2 was used to identify the quantitative trait loci (QTL) for plant height (PH) in wheat (Triticum aestivum L.). Possible genetic relationships between PH and PH components (PHC), including spike length (SL) and internode length from the first to the fourth node counted from the top, abbreviated as FIITL, SITL, TITL and FOITL, respectively, were evaluated at the QTL level. A QTL for PH was mapped using data on PH and on PH conditioned by PHC using the IciMapping V3.0 software. Conditional QTL mapping proved that, at the QTL level, SL contributed the least to PH, followed by FIITL and FOITL, while TITL had the strongest influence on PH, followed by SITL. These results indicate that the conditional QTL mapping method can be used to evaluate possible genetic relationships between PH and PHC, and that it can efficiently and precisely reveal counteracting QTL, which will enhance our understanding of the genetic basis of PH in wheat.
Authors:Jing Yang, Lei-lei Choi, De-qiang Li, Feng-qing Yang, Ling-jie Zeng, Jing Zhao, and Shao-ping Li
A double-development TLC method has been developed for simultaneous qualitative and quantitative analysis of hydrophilic and lipophilic constituents of Salvia miltiorrhiza (Danshen). The optimized mobile phases dichloromethane-ethyl acetate-formic acid 22:24:10 (ν/ν) and petroleum ether-ethyl acetate-cyclohexane 25:11:14 (ν/ν) were used for the double development on nano-silica gel 60F254 plates. Their characteristic TLC profiles were observed under UV light at 254 and 365 nm and the bands were then revealed by reaction with 5% H2SO4 in EtOH. Quantification of twelve compounds was achieved by densitometry at 260 or 290 nm, with reference at 400 nm. Linearity was quite good (R2 > 0.99) within the ranges tested. This method could be used for quality control of Danshen.