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Search Results: 1 - 10 of 104228 matches for " Siping Zhang "
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Field Utilization of Dried Water Hyacinth for Phosphorous Recovery from Source-Separated Human Urine  [PDF]
Boqi Weng, Junli Zhou, Siping Zheng, Xiuxia Chen, Weiguang Zhang, Qin Huang
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.38085
Abstract: This research demonstrated the feasibility of converting source-separated human urine into a solid fertilizer by means of continuous absorption and solar thermal evaporation using dried water hyacinth as adsorbent. In a preliminary experiment, the dried petioles of water hyacinth (DWH) absorbed urine in a mean rate of 18.78 ml·g-1 within 7 d, retrieving about 3.46% urine dissolved solids (UDS). In an advanced experiment, the DWH’s capacity of urine absorption declined from an initial 2.73 L·kg-1·d-1 to 0.68 L·kg-1·d-1, with a requirement of material change in about 25 effective days and an average ratio of 25 (L) to 1 (kg). Phosphorus (P2O5) concentration in the adsorbent increased from 0.46% (material baseline) to 3.14% (end product), suggesting a satisfactory recovery of the element. In field application, the urine was discharged, not in wet weather, onto the DWH via a tube connected to a waterless urinal. There are several ways to use the UDS-DWH as P(K)-rich fertilizer, e.g., making soluble fertilizer for foliage spraying to encourage prolific flowering and fruiting. Apparently, utilization of water hyacinth waste to recover dissolved plant nutrient elements from source-separated urine will benefit the environment in a wide range of perspectives. The herein innovative use of water hyacinth is also expected to be useful in the recycling of certain dissolved hazardous materials.
Diagnosis of Premature Senescence of Cotton Using SPAD Value  [PDF]
Pengcheng Li, Helin Dong, Aizhong Liu, Jingran Liu, Miao Sun, Guoping Wang, Siping Zhang, Yabing Li, Shuchun Mao
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.511107
Abstract: Field experiments were conducted in 2011 on an experimental farm at the Cotton Research Insti-tute, Chinese Academy of Agricultural Sciences, Anyang, China. We conducted experiments with a “SPAD-502” meter to quickly measure the relative value of chlorophyll content in the leaf blades of field cotton. Our goal was to seek a suitable leaf on a cotton plant to diagnose senescence status of crop plants at later stages of growth. We began by studying the dynamic change rule of the dis-tal-most four leaves of the cotton plant during the entire growth period with two early-maturing cultivars (CCRI 36, CCRI 50) and two mid-maturing cultivars (CCRI 41, SCRC 28). We also examined the effect of different nitrogen and potassium fertilizer rates on SPAD values of the leaves of SCRC 28. Our results suggest that SPAD values of the 1st distal stem leaves from two early cultivars can act as good indicators of senescence status in the plants, if they are measured between 10 d before the boll-opening stage and 10 d after boll opening stage. Differences of SPAD values of the 3rd distal stem leaves of two mid-maturing cultivars measured between about 15 d before the boll opening stage and 15 d after the boll opening stage can also be used to measure senescence status in these cotton cultivars. The conclusion can be used for cotton producer to manage N fertilizer better at later growth stage.
An H∞ Strategy for Strain Estimation in Ultrasound Elastography Using Biomechanical Modeling Constraint
Zhenghui Hu, Heye Zhang, Jinwei Yuan, Minhua Lu, Siping Chen, Huafeng Liu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0073093
Abstract: The purpose of ultrasound elastography is to identify lesions by reconstructing the hardness characteristics of tissue reconstructed from ultrasound data. Conventional quasi-static ultrasound elastography is easily applied to obtain axial strain components along the compression direction, with the results inverted to represent the distribution of tissue hardness under the assumption of constant internal stresses. However, previous works of quasi-static ultrasound elastography have found it difficult to obtain the lateral and shear strain components, due to the poor lateral resolution of conventional ultrasound probes. The physical nature of the strain field is a continuous vector field, which should be fully described by the axial, lateral, and shear strain components, and the clinical value of lateral and shear strain components of deformed tissue is gradually being recognized by both engineers and clinicians. Therefore, a biomechanical-model-constrained filtering framework is proposed here for recovering a full displacement field at a high spatial resolution from the noisy ultrasound data. In our implementation, after the biomechanical model constraint is integrated into the state-space equation, both the axial and lateral displacement components can be recovered at a high spatial resolution from the noisy displacement measurements using a robust filter, which only requires knowledge of the worst-case noise levels in the measurements. All of the strain components can then be calculated by applying a gradient operator to the recovered displacement field. Numerical experiments on synthetic data demonstrated the robustness and effectiveness of our approach, and experiments on phantom data and in-vivo clinical data also produced satisfying results.
Amination of Nitroazoles — A Comparative Study of Structural and Energetic Properties
Xiuxiu Zhao,Cai Qi,Lubo Zhang,Yuan Wang,Shenghua Li,Fengqi Zhao,Siping Pang
Molecules , 2014, DOI: 10.3390/molecules19010896
Abstract: In this work, 3-nitro-1 H-1,2,4-triazole ( 1) and 3,5-dinitro-1 H-pyrazole ( 2) were C-aminated and N-aminated using different amination agents, yielding their respective C-amino and N-amino products. All compounds were fully characterized by NMR ( 1H, 13C, 15N), IR spectroscopy, differential scanning calorimetry (DSC). X-ray crystallographic measurements were performed and delivered insight into structural characteristics as well as inter- and intramolecular interactions of the products. Their impact sensitivities were measured by using standard BAM fallhammer techniques and their explosive performances were computed using the EXPLO 5.05 program. A comparative study on the influence of those different amino substituents on the structural and energetic properties (such as density, stability, heat of formation, detonation performance) is presented. The results showed that the incorporation of an N-amino group into a nitroazole ring can improve nitrogen content, heat of formation and impact sensitivity, while the introduction of a C-amino group can enhance density, detonation velocity and pressure. The potential of N-amino and C-amino moieties for the design of next generation energetic materials is explored.
Unique Positive Almost Periodic Solution for Discrete Nonlinear Delay Survival Red Blood Cells Model
Xitao Yang,Siping Tang
Abstract and Applied Analysis , 2009, DOI: 10.1155/2009/987343
Abstract: We obtain sufficient conditions which guarantee the global attractivityof solutions for nonlinear delay survival red blood cells model. Then, some criteria are establishedfor the existence, uniqueness and global attractivity of positive almost periodic solutions of thealmost periodic system.
Methylation Status of the Follistatin Gene at Different Development Stages of Japanese Flounder(Paralichthys olivaceus) Methylation Status of the Follistatin Gene at Different Development Stages of Japanese Flounder(Paralichthys olivaceus)
HUANG Yajuan,HU Nan,SI Yufeng,LI Siping,WU Shuxian,ZHANG Meizhao,WEN Haishen,LI Jifang,LI Yun,HE Feng
- , 2018,
Abstract: Follistatin(Fst) is a hyperplasia factor that plays a crucial role in muscle development.DNA methylation,a significant process,regulates gene expression.The aim of our study is to examine the DNA methylation and expression patterns of Fst gene at five different development stages of Japanese flounder(stage A,7 dph;stage B,90 dph;stage C,about 180 dph;stage D,about 24 months;stage E,about 36 months).The muscle tissue of Japanese flounder was obtained at different development stages in this experiment.DNA methylation levels in the promoter and exon 2 of Fst were determined by bisulfite sequencing,and the relative expression of the Fst gene at the five stages was measured by quantitative PCR.The results showed that the lowest methylation level was at stage A and the highest methylation level was at stage B.Moreover,the highest expression level of the Fst gene was observed at stage A.The m RNA abundance was negatively correlated with DNA methylation level.Three Cp G islands in the promoter region and three Cp G islands in exon 2 of Fst were found in the binding sequence of the putative transcription factor.These results offered a theoretical basis for the mechanism of Fst gene regulation to muscle development at different development stages
Constantly Developing Journal of Changjiang Vegetables Improving Spread Ability of Scientific Journals
创新发展《长江蔬菜》 提高科技期刊传播能力


中国科技期刊研究 , 2011,
Abstract: 《长江蔬菜》作为一个自收自支的期刊,近年来如何在激励的市场竞争中创新发展,采取了加大技术类文章发表比例,从选、种、管、销四个方面开辟特色栏目,突出报道重点工作等一系列得力的发展举措。为提高《长江蔬菜》科技传播能力,提出在调研的基础上选题策划、密切关注蔬菜产业科研动态、创新发行手段、多种出版形式并存等相应的发展策略。
Dendritic Cell-Associated miRNAs Are Modulated via Chromatin Remodeling in Response to Different Environments
Shiyue Mei, Yuanhang Liu, Yue Bao, Yuan Zhang, Siping Min, Yifei Liu, Yun Huang, Xidi Yuan, Yue Feng, Jiandang Shi, Rongcun Yang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090231
Abstract: Introduction Epigenetic modification plays a critical role in regulating gene expression. To understand how epigenetic modification alters miRNA expression in monocyte-derived dendritic cells (moDCs) in different environments, we analyzed the connections between H3K4me3 and H3K27me3 modification and the expression of miRNAs in LPS- and TGF-β-conditioned moDCs. Results In moDCs, H3K4me3 modification was strongly associated with the expression of activating miRNAs, whereas H3K27me3 was related to repressive miRNAs. The regulation of miRNA expression by H3K4me3 and H3K27me3 was further confirmed by silencing or inhibiting methyltransferases or methylation-associated factors in LPS- and TGF-β-conditioned moDCs. siRNAs targeting H3K4me3-associated mixed lineage leukemia (MLL) and retinoblastoma binding protein 5 (RBBP5) reduced H3K4me3 enrichment and downregulated miRNA expression; conversely, silencing H3K27me3-associated enhancer of zeste homolog 2 (EZH2) and embryonic ectoderm development (EED) genes upregulated the DC-associated miRNAs. However, LPS-mediated miRNAs were often associated with H3K4me3 redistribution from the transcription start site (TSS) to the miRNA-coding region. Silencing LPS-associated NF-κB p65 and CBP/p300 not only inhibited H3K4m3 redistribution but also reduced miRNA expression. LPS-upregulated RBBP4 and RBBP7, which are involved in chromatin remodeling, also affected the redistribution of H3K4me3 and reduced the expression of miRNAs. Conclusion In LPS- and TGF-β-conditioned moDCs, miRNAs may be modulated not only by H3K4m3 and H3K27me3 modification but also by redistribution of H3K4me3 around the transcriptional start site of miRNAs. Thus, H3K4me3 and H3K27me3 epigenetic modification may play an important role in regulating DC differentiation and function in the presence of tumor or inflammatory environments.
Synthesis and Characterization of 5-Nitro-2-nitratomethyl-1,2,3,4-tetrazole: A High Nitrogen Energetic Compound with Good Oxygen Balance
Yuchuan Li,Wei Liu,Siping Pang
Molecules , 2012, DOI: 10.3390/molecules17055040
Abstract: The synthesis of 5-nitro-2-nitratomethyl-1,2,3,4-tetrazole (4) and its full characterization are given here. Compound 4 was synthesized through the nitration of 5-nitro-2-hydroxymethyl-tetrazole (3) with fuming nitric acid and acetic anhydride and its structure was characterized by MS, FT-IR, 1H-NMR and 13C-NMR techniques. The crystal structure of 4 was determined by X-ray single crystal diffraction analysis. The compound belongs to the orthorhombic system with space group Pna2(1), and its crystal parameters were a = 2.121(8) nm, b = 0.5281(19) nm, c = 0.6246(2) nm, Z = 4, V = 0.6995(4) nm3, Dc = 1.805 g/cm3, F(000) = 384, μ = 0.174 mm?1. A theoretical study of 4 has been performed, using quantum computational density functional theory (B3LYP methods) with 6-31G* basis sets as implemented in the Gaussian 03 program suite. The obtained heat of formation (HOF) for 4 was 228.07 kJ·mol?1, the detonation pressure (P) values calculated for 4 was 37.92 GPa, the detonation velocity (D) can reach 9260 m·s?1, and the oxygen balance was zero (Q), making 4 a competitive energetic compound.
Dynamics of soil enzyme activity and nutrient content in intercropped cotton rhizosphere and non-rhizosphere

MENG Yali,WANG Liguo,ZHOU Zhiguo,WANG Ying,ZHANG Lizhen,BIAN Haiyun,ZHANG Siping,CHEN Binglin,

应用生态学报 , 2005,
Abstract: The study with high yield cotton-wheat double cropping system showed that soil urease,invertase,protease and catalase activities in intercropped cotton field had the same changing trends with those in mono-cultured cotton field,but were significantly higher in intercropped than in mono-cultured cotton rhizosphere and non-rhizosphere at all development stages of cotton.During the intergrowth period of wheat and cotton,soil nutrient contents in intercropped cotton rhizosphere and non-rhizosphere were lower than or had little difference with those in mono-cultured cotton rhizosphere and non-rhizosphere,but became significantly higher after wheat harvested.The changing trends of soil nutrient contents in intercropped cotton field had little difference from those in mono-cultured cotton field,but the nutrient absorption peak appeared late.The soil enzyme activities and nutrient contents were generally higher in rhizosphere than in non-rhizosphere of both intercropped and mono-cultured cotton.Soil nutrient contents had significant(P<0.05,n=32) or very significant(P<0.01,n=32) correlation with the activities of soil urease,invertase and protease,but had little correlation with soil catalase activity.
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