Mutual influence of copper and paraquat on their adsorption in soil

Paraquat and copper (Cu) are commonly used and detected in soil.Therefore,it is important to understand their mobility in the environment.In this study,the competitive effects of paraquat and Cu on their adsorption in five representative Chinese soils were investigated using batch adsorption equilibrium experiments and spectroscopic analysis.The results showed that the adsorption of paraquat in soil varied with soil type and was positively correlated with both soil cation exchange capacity and o...     

长白落叶松工业纤维林结构与生长研究

通过对调查资料及数据的分析、处理,运用回归分析、概率分布等方法,提出了合理的长白落叶松工业纤维林林分直径结构,进而得出不同立地条件下长白落叶松工业纤维林的生长过程,以及长白落叶松工业纤维林的培育主要应在Ⅰ和Ⅱ地位级上进行的结论．     

Analysis of chemical structure of wood charcoal by X-ray photoelectron spectroscopy

Wood charcoal carbonized at various temperatures was analyzed by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffractometry to investigate the changes of chemical structures during the carbonization process. From the infrared spectra, the carbon double bonds and aromatic rings were seen to form at a carbonization temperature of about 600°C. From the XPS spectra, the ratio of aromatic carbons increased in the temperature range 800–1000°C and over 1800°C. The condensation of aromatic rings proceeded as carbonization progressed. The drastic reduction of electrical resistivity of charcoals was observed in almost the same temperature range. It was found that the condensation of aromatic rings had some relation to the decline in electrical resistivity. Wood charcoal carbonized at 1800°C was partly graphitized, a finding supported by the results of X-ray diffraction and XPS. The functional groups containing oxygen diminished with the increase in carbonization temperature.This paper was presented at the 45th Annual Meeting of the Japan Wood Research Society in Tokyo, April 1995 and at the 47th Annual Meeting of the Japan Wood Research Society in Kochi, April 1997     

Measurements of the bioelectrical potential of a Japanese oak (Quercus crispula Blume) sapling: Effect of the radial distribution of inorganic ingredients within a tree stem on the diurnal change in resting potential

This study investigated the relation between the resting potential of a 2-year-old Japanese oak (Quercus crispula Blume) sapling and its physiology, especially the radial transport of water containing inorganic ingredients in the stem using the scanning electron microscope-energy dispersive X-ray microanalyzer (SEM-EDXA) method. The resting potential of a sapling could be monitored continuously with our measuring apparatus. Changes in resting potential were due to the light. The hyperpolarization and depolarization peaks of the resting potential, whose absolute voltage was about 10mV, occurred right after lights-off and lights-on, respectively. The resting potential was found to show periodic responses for each day unit. At night (lights-off), the resting potential tended to depolarize with an increase in tangential strain. On the other hand, during the daytime (lights-on) the resting potential tended to hyperpolarize, depolarize, or show a nearly constant value for the tangential strain. The water containing inorganic ingredients was transported, via transpiration, in both directions between the mature xylem zone and the phloem zone through differentiating xylem cells. This water transport within a tree stem had a significant effect on the diurnal changes in resting potential.Part of this paper was presented at the 47th annual meeting of the Japan Wood Research Society, Kochi, April 3–5, 1997     

橡胶树不同抗风品系木材比较解剖研究

利用光镜和扫描电镜对海垦１（ＨＡＩ－ＫＥＮＧ１）ＰＲ１０７,ＧＴ１,ＲＲＩＭ６００和ＰＢ８６５种不同抗风力的橡胶树品系的木材结构进行解剖学观察,描述木材结构的特征,以橡胶树木材的１３个主要组成分子特征－胶质纤维的分布及数量,导管长度,复孔率,导管弦径,导管密度,射线频率,单列射线高度,多列射线高度与宽度,纤维长度和宽度等因子,对不同抗风力的橡胶树进行比较,阐述了木材解剖特征与橡胶树抗风能力的关系。     

X-ray Diffraction Analysis of the 25Cr2MoVA Steel After Rapid Ion Nitriding

The surface phase constituent of the 25Cr2MoVA steel has been analysed after conventional and rapid ion nitridings.The relation between the tempered temperature and the phase constituent has been investigated.     

兰考泡桐木纤维长度变异规律初探

兰考泡桐木材纤维长度的水平变异从里向外,不断增长,且与距髓心的距离成线性回归关系。纤维长度垂直变异从下向上开始增加到最大值而后降低;距髓心恒定年龄的同一植株的不同年龄和不同植株的同一年龄垂直变异略有区别。     

儿茶素与咖啡碱络合物的晶体学研究

通过高效液相色谱分析发现儿茶素和咖啡碱占绿茶乳酪总质量的88％以上.以乳酪中含量最高的两种酯型儿茶素和对应的非酯型儿茶素与咖啡碱络合建立绿茶乳酪简化体系CATs-CAF,发现4种儿茶素在沉淀中的分布比例为EC:ECG:EGC:EGCG≈1:2:1:2.选用ECG和EC分别与咖啡碱络合制备单晶,扫描电镜观察络合前后晶体的...     

Discovery of GOT1 Inhibitors from a Marine-Derived Aspergillus terreus That Act against Pancreatic Ductal Adenocarcinoma

Pancreatic ductal adenocarcinoma (PDAC) is a devastating digestive system carcinoma with high incidence and death rates. PDAC cells are dependent on the Gln metabolism, which can preferentially utilize glutamic oxaloacetate transaminase 1 (GOT1) to maintain the redox homeostasis of cancer cells. Therefore, small molecule inhibitors targeting GOT1 can be used as a new strategy for developing cancer therapies. In this study, 18 butyrolactone derivatives (1–18) were isolated from a marine-derived Aspergillus terreus, and asperteretone B (5), aspulvinone H (AH, 6), and (+)-3′,3′-di-(dimethylallyl)-butyrolactone II (12) were discovered to possess significant GOT1-inhibitory activities in vitro, with IC₅₀ values of (19.16 ± 0.15), (5.91 ± 0.04), and (26.38 ± 0.1) µM, respectively. Significantly, the molecular mechanism of the crystal structure of GOT1–AH was elucidated, wherein AH and the cofactor pyrido-aldehyde 5-phosphate competitively bound to the active sites of GOT1. More importantly, although the crystal structure of GOT1 has been discovered, the complex structure of GOT1 and its inhibitors has never been obtained, and the crystal structure of GOT1–AH is the first reported complex structure of GOT1/inhibitor. Further in vitro biological study indicated that AH could suppress glutamine metabolism, making PDAC cells sensitive to oxidative stress and inhibiting cell proliferation. More significantly, AH exhibited potent in vivo antitumor activity in an SW1990-cell-induced xenograft model. These findings suggest that AH could be considered as a promising lead molecule for the development of anti-PDAC agents.     

软X射线对柑桔愈伤组织和原生质体的影响

研究了软Ｘ射线对丹西红桔愈伤组织和原生质体的影响。结果表明,辐照１ｈ和１．５ｈ都在不同程度上抑制了愈伤组织的生长,辐照１．５ｈ表现更为明显;原生质体经辐照１．５ｈ后分裂的很少,在培养过程中发生质壁分离,辐射１ｈ的原生质体受抑制的作用不一些。