Extensive research in the 20th century explored the potential for mitigation of drought by applying polymers (film antitranspirants) to leaves to reduce water loss. It was concluded that film antitranspirants are of l...Extensive research in the 20th century explored the potential for mitigation of drought by applying polymers (film antitranspirants) to leaves to reduce water loss. It was concluded that film antitranspirants are of limited usefulness, since the polymers reduced photosynthesis (in addition to transpiration) and this was assumed to be detrimental to growth and yield. We propose, however, that irrespective of reduced assimilate availability from photosynthesis, the most drought sensitive stage of yield formation in wheat may respond positively to antitranspirant application. Six field experiments involved ap-plying the film antitranspirant di-1-p-menthene at five development stages and 10 soil moisture deficits (SMD) in total over three years. Yield was reduced when the film antitranspirant was applied at development stages less-sensitive to drought, from inflorescence emergence to anthesis, consistent with the conclusions from previous research. In contrast, yield was increased when the film antitranspirant was applied at flag leaf stage, just before the stage most sensitive to drought (boot stage). These results show that film antitranspirant has the potential to mitigate drought effects on yield of wheat.展开更多
The optimum conditions for extraction-chromatography using di-(l-methylheptyl) methylphosphonate resin to separate indium(Ⅲ) from its coexisting metal ions were studied. A procedure for extraction- chromatographic se...The optimum conditions for extraction-chromatography using di-(l-methylheptyl) methylphosphonate resin to separate indium(Ⅲ) from its coexisting metal ions were studied. A procedure for extraction- chromatographic separation and spectrophotometric determination of indium has been developed. This proce- dure gives more clear-cut separation and higher accuracy and reproducibility than ordinarily used separation by solvent extraction with butyl acetate. Besides, it can be used to separate and determine cadmium simultaneously.展开更多
Two new complexes[Cu(AQTC)_(0.5)(H_(2)O)_(3)]·3H_(2)O}_(n) (1,H_(4)AQTC=anthraquinone-1,4,5,8-tetracarboxylic acid) and Cu[(Py)_(2)C(OH)_(2)]_(2)(H_(2)AQTC)·2H_(2)O (2,(Py)_(2)CO=di-2-pyridyl ketone) have be...Two new complexes[Cu(AQTC)_(0.5)(H_(2)O)_(3)]·3H_(2)O}_(n) (1,H_(4)AQTC=anthraquinone-1,4,5,8-tetracarboxylic acid) and Cu[(Py)_(2)C(OH)_(2)]_(2)(H_(2)AQTC)·2H_(2)O (2,(Py)_(2)CO=di-2-pyridyl ketone) have been prepared and characterized by elemental analyses and IR spectroscopy.X-ray crystallographic studies show that complex 1crystallizes in monoclinic space group C2/m and complex 2 in monoclinic space group P2_1/c.Complex 1 features a1D chain structure by carboxyl oxygen atoms.Complex 2 displays a mononuclear structure and anions and cations are separated.What's interesting is that the ligand of H_(4)AQTC with eight carboxyl oxygen atoms and two quinone oxygen atoms does not directly coordinate with metals,and only exist as a counter-anion in complex 2.Three-dimensional structures of two complexes are formed by intermolecular interactions.The thermogravimetric analyses of two complexes are investigated.The luminescent properties of complex 1 are investigated as well.展开更多
文摘Extensive research in the 20th century explored the potential for mitigation of drought by applying polymers (film antitranspirants) to leaves to reduce water loss. It was concluded that film antitranspirants are of limited usefulness, since the polymers reduced photosynthesis (in addition to transpiration) and this was assumed to be detrimental to growth and yield. We propose, however, that irrespective of reduced assimilate availability from photosynthesis, the most drought sensitive stage of yield formation in wheat may respond positively to antitranspirant application. Six field experiments involved ap-plying the film antitranspirant di-1-p-menthene at five development stages and 10 soil moisture deficits (SMD) in total over three years. Yield was reduced when the film antitranspirant was applied at development stages less-sensitive to drought, from inflorescence emergence to anthesis, consistent with the conclusions from previous research. In contrast, yield was increased when the film antitranspirant was applied at flag leaf stage, just before the stage most sensitive to drought (boot stage). These results show that film antitranspirant has the potential to mitigate drought effects on yield of wheat.
文摘The optimum conditions for extraction-chromatography using di-(l-methylheptyl) methylphosphonate resin to separate indium(Ⅲ) from its coexisting metal ions were studied. A procedure for extraction- chromatographic separation and spectrophotometric determination of indium has been developed. This proce- dure gives more clear-cut separation and higher accuracy and reproducibility than ordinarily used separation by solvent extraction with butyl acetate. Besides, it can be used to separate and determine cadmium simultaneously.
基金Supported by the Scientific and Technological Research Projects of Henan Province(182102311077)National Natural Science Foundation of China(21776063 and U1704127)。
文摘Two new complexes[Cu(AQTC)_(0.5)(H_(2)O)_(3)]·3H_(2)O}_(n) (1,H_(4)AQTC=anthraquinone-1,4,5,8-tetracarboxylic acid) and Cu[(Py)_(2)C(OH)_(2)]_(2)(H_(2)AQTC)·2H_(2)O (2,(Py)_(2)CO=di-2-pyridyl ketone) have been prepared and characterized by elemental analyses and IR spectroscopy.X-ray crystallographic studies show that complex 1crystallizes in monoclinic space group C2/m and complex 2 in monoclinic space group P2_1/c.Complex 1 features a1D chain structure by carboxyl oxygen atoms.Complex 2 displays a mononuclear structure and anions and cations are separated.What's interesting is that the ligand of H_(4)AQTC with eight carboxyl oxygen atoms and two quinone oxygen atoms does not directly coordinate with metals,and only exist as a counter-anion in complex 2.Three-dimensional structures of two complexes are formed by intermolecular interactions.The thermogravimetric analyses of two complexes are investigated.The luminescent properties of complex 1 are investigated as well.