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Research Progress in Formation and Detection Method of Dextran in Sugarcane Production 被引量:1
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作者 徐艳芳 刘桂云 +4 位作者 梁达奉 蚁细苗 柳颖 曾练强 常国炜 《Agricultural Science & Technology》 CAS 2016年第7期1692-1696,共5页
Dextran in sugarcane production process is formed by Leuconostoc rnesenteroides. The content levels of dextran is related to sugarcane varieties, field condition (planting pattern, temperature, humidity, sunlight, so... Dextran in sugarcane production process is formed by Leuconostoc rnesenteroides. The content levels of dextran is related to sugarcane varieties, field condition (planting pattern, temperature, humidity, sunlight, soil, foreign material), de- gree of injury (refractory cane, harvesting methods), and can be rapidly and accu- rately measured by Dextran Immunonephelometric Test Kit. The presence of dextran indicates that sucrose has been lost, so sugarcane dextran is a direct and reliable indicator to measure sugarcane freshness and quality. 展开更多
关键词 Sugarcane production DEXTRAN Sugarcane varieties Sugarcane fresh- ness Dextran Immunonephelometric Test Kit
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提高中学音乐教学实效性的策略
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作者 罗鹏飞 《教师》 2018年第8期73-73,共1页
音乐课是中学生德、智、体、美全面发展的重要课程之一,但就现阶段的初中音乐课堂教学来看,低效性是音乐教学最真实的教学现状,如何打造高效的音乐课堂便成了广大音乐教育者最为关注的话题。文章从初中音乐教学的角度出发,从两个方... 音乐课是中学生德、智、体、美全面发展的重要课程之一,但就现阶段的初中音乐课堂教学来看,低效性是音乐教学最真实的教学现状,如何打造高效的音乐课堂便成了广大音乐教育者最为关注的话题。文章从初中音乐教学的角度出发,从两个方面探讨了提高中学音乐课堂实效性的策略。 展开更多
关键词 兴趣 “新鲜度” 音乐要素 实效性
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Changes in the Contents of ATP and Its Related Breakdown Compounds in Various Tissues of Oyster During Frozen Storage 被引量:13
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作者 WANG Qi XUE Changhu LI Zhaojie FU Xueyan XU Jie XUE Yong 《Journal of Ocean University of China》 SCIE CAS 2007年第4期407-412,共6页
The changes in the contents of adenosine 5’-triphosphate (ATP) and its related breakdown compounds were investigated in the adductor muscle, mantle, gill and body trunk of oyster (Crassostrea gigas) during frozen sto... The changes in the contents of adenosine 5’-triphosphate (ATP) and its related breakdown compounds were investigated in the adductor muscle, mantle, gill and body trunk of oyster (Crassostrea gigas) during frozen storage at -20℃ and -30℃ and compared with that of the fresh oyster. The investigation was performed using an HPLC system. Different extents of ATP decomposi- tion were found in various tissues frozen at the two temperatures. The K, K’ and A.E.C values were calculated as the chemical fresh- ness indices. Considering the results of sensory evaluation, the A.E.C. value in body trunk at -20℃ and -30℃ could be used as the best freshness index for frozen oyster. 展开更多
关键词 OYSTER FROZEN adenosine 5'-triphosphate (ATP) HPLC freshness index
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Spontaneous combustion tendency of fresh and pre-oxidized sulfide ores 被引量:2
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作者 阳富强 吴超 李孜军 《Journal of Central South University》 SCIE EI CAS 2014年第2期715-719,共5页
Three representative sulfide ore samples were collected from typical metal mines,and their corresponding pre-oxidized products were obtained under nature environment.The thermal behaviors of each sample at heating rat... Three representative sulfide ore samples were collected from typical metal mines,and their corresponding pre-oxidized products were obtained under nature environment.The thermal behaviors of each sample at heating rates of 5,10,15 and 20 °C/min in air flow from ambient temperature to 800 °C were studied by simultaneous thermal analysis and the TG/DSC curves before and after the pre-oxidation were compared.By the peak temperature of DTG curves,the whole reaction process for each sample was divided into different stages,and the apparent activation energies were calculated by the Ozawa-Flynn-Wall method.The results show that the reaction process of each sample after pre-oxidation is more complex,with quicker reaction rates,fewer heat production quantities,and higher or lower ignition-points.The apparent activation energies decrease from 364.017-474.228 kJ/mol to 244.523- 333.161 kJ/mol.Therefore,sulfide ores are more susceptible to spontaneous combustion after the pre-oxidation. 展开更多
关键词 sulfide ores spontaneous combustion tendency apparent activation energy PRE-OXIDATION
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Effect of Sources and Concentrations of Soybean Phosphatidylcholine on Diluted Goat Semen Equilibrated at 4 ℃ 被引量:1
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作者 N. Phutikanit E. Sangkrachang J. Suwimonteerabutr J. Singlor 《Journal of Agricultural Science and Technology(A)》 2011年第8期1170-1173,共4页
The objective of the present study was to determine the proper sources and concentrations of soybean lecithin (phosphatidylcholine, PC) to be used as substitute for hen egg yolk in extender for preserving goat semen... The objective of the present study was to determine the proper sources and concentrations of soybean lecithin (phosphatidylcholine, PC) to be used as substitute for hen egg yolk in extender for preserving goat semen. Two sources of soybean lecithin (20% and 95% soybean phosphatidylcholine; PC20 and PC95) and three concentrations (1%, 2% and 3% v/v) of PC20 and PC95 supplemented in Tris-citric acid-fructose (TCF) extender were tested. The TCF extender supplemented with 20% hen egg yolk was used as a control. Fresh semen samples were collected from 3 goats by artificial vagina. Seminal plasma was removed by centrifugation and sperm pellets were pooled together and divided into 7 groups according to types of extender. The diluted semen samples were kept at 4 ℃ (equilibration). The semen qualities including progressive motility, sperm viability, sperm plasma membrane integrity and tail abnormalities were evaluated before dilution and after 4 hrs equilibration. It was found that the progressive motility of equilibrated semen in egg yolk and PC20 extenders were higher than those in PC95 extender (P 〈 0.05). Sperm viability was lower in 1% and 2% PC95 extender compared to other extenders (P 〈 0.05). PC20 extender maintained the sperm membrane integrity and normal tail morphology at low temperature better than egg yolk and PC95 (P 〈 0.05). It can be concluded that 20% soybean phosphatidylcholine supplemented in TCF extender at 1%-3% (v/v) is as effective as hen egg yolk to preserve goat semen during equilibration at 4 ℃ for 4 hrs . 展开更多
关键词 Goat semen semen extender soybean lecithin PHOSPHATIDYLCHOLINE EQUILIBRATION
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Seasonal changes of bioelements in litter and their potential return to green leaves in five species of tropical dry deciduous forest, western India
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作者 J. I. Nirmal Kumar Rita N Kumar +1 位作者 Rohit Kumar Bhoi Kanti Patel 《Journal of Forestry Research》 SCIE CAS CSCD 2010年第1期33-38,I0002,共7页
The Litter nutrient concentrations of N, P, Ca, Mg, K and Na in mature leaves, twigs and reproductive parts and their relationship between senescent and young leaves were investigated in five forest species: Acacia n... The Litter nutrient concentrations of N, P, Ca, Mg, K and Na in mature leaves, twigs and reproductive parts and their relationship between senescent and young leaves were investigated in five forest species: Acacia nilotica, Acacia leucophloea. Tectona grandis, Miliusa tomentosa and Butea monosperma in Indian tropical dry deciduous forest in Western India.. Total dry matter of plant species was recorded and analyzed for N, P, Ca, Mg, K and Na. A. nilotica had the highest concentrations of N in leaf, while ,4. leucophloea had the highest concentrations of Ca and Mg in leaf. The highest concentrations of P in leaf were found in A. nilotica, A. leucophloea and B. monosperma where as lowest in T. grandis and M. tomentosa. No significant differences in K and Na were registered among the species. A marked seasonal variability was ob- served in the concentrations of N, P and K, except for Ca and Mg. Potas- sium is the single element that undergoes leaching and mobilization in all species. Resorped N and P can be used for the production of fresh leaf in the following annual cycle. Nutrient resorption and retranslocation from senescent leaves and litter supports the production of new foliage and increase the fertility of soil. 展开更多
关键词 Tropical dry deciduous forest nutrient concentration senescent and fresh leaves nutrient return nutrient resorption efficiency
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Determination of royal jelly freshness by ELISA with a highly specific anti-apalbumin 1,major royal jelly protein 1 antibody 被引量:2
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作者 Li-rong SHEN Yi-ran WANG +5 位作者 Liang ZHAI Wen-xiu ZHOU Liang-liang TAN Mei-lu LI Dan-dan LIU Fa XIAO 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2015年第2期155-166,共12页
Major royal jelly protein 1(MRJP1), designated apalbumin 1, has been regarded as a freshness marker of royal jelly(RJ). A MRJP1-specific peptide(IKEALPHVPIFD) identified by bioinformatics analysis of homologous ... Major royal jelly protein 1(MRJP1), designated apalbumin 1, has been regarded as a freshness marker of royal jelly(RJ). A MRJP1-specific peptide(IKEALPHVPIFD) identified by bioinformatics analysis of homologous members of the major royal protein family was synthesized and used to raise polyclonal anti-MRJP1 antibody(antiSP-MRJP1 antibody). Western blot analysis showed that anti-SP-MRJP1 antibody only reacted with MRJP1 in RJ. In contrast, the previously reported antibody against recombinant MRJP1(anti-R-MRJP1 antibody) reacted with other members of MRJP family in RJ. Enzyme-linked immunosorbent assay(ELISA) using anti-SP-MRJP1 antibody demonstrated that MRJP1 content in RJ stored at 40 °C significantly degraded by 37.3%, 55.9%, 58.0%, 60.6%, 65.7%, 72.7%, and 73.1% at 7, 14, 21, 28, 35, 42, and 49 d, respectively, when compared with MRJP1 content in fresh RJ(0 d). Optical density analysis of MRJP bands from sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE) profiles demonstrated that the degradation of MRJP1, MRJP2, MRJP3, and MRJP5 in RJ was strongly and positively correlated with the period of storage(P〈0.0001). Our results indicated anti-SP-MRJP1 antibody was highly specific for MRJP1, and ELISA using the antibody is a sensitive and easy-to-use method to determine the freshness and authenticity of RJ. 展开更多
关键词 FRESHNESS Royal jelly Major royal jelly protein 1(MRJP1) Enzyme-linked immunosorbent assay(ELISA) High specific antibody
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Intrinsic viscosity of polymer solutions: fresh ideas to an old problem 被引量:2
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作者 Deyue Yan 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第5期835-838,共4页
Intrinsic viscosity is one of the most fundamental properties of dilute polymer solutions; its study forms an integral part of the cornerstone of the modern macromolecular theory. However, a general theory applicable ... Intrinsic viscosity is one of the most fundamental properties of dilute polymer solutions; its study forms an integral part of the cornerstone of the modern macromolecular theory. However, a general theory applicable to any chain architectures and solvent conditions has remained elusive, due to the formidable challenges in the theoretical treatment of the long-range, many-body and accumulative hydrodynamic effects. Recently, Lijia An and coworkers at the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, has developed a new approach that largely overcomes these challenges. Their new theory provides a simple and unified theoretical framework for describing the intrinsic viscosity of polymers with arbitrary architectures under any solvent conditions and forms the theoretical basis for inferring the polymer chain structure from intrinsic viscosity measurements. Comparisons with existing experimental data yield extensive, quantitative agreement. 展开更多
关键词 polymer solution intrinsic viscosity polymer chain structure hyperbranched polymers hydrodynamic effects
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