Light is a fundamental source of energy but is also potentially harmful to organisms. Plants have evolved a variety of regulatory mechanisms to respond to the naturally varying light conditions. Xanthophyll cycle is n...Light is a fundamental source of energy but is also potentially harmful to organisms. Plants have evolved a variety of regulatory mechanisms to respond to the naturally varying light conditions. Xanthophyll cycle is now recognized as a key regulator and photoprotective mechanism found ubiquitously in plants. Xanthophyll cycle has multiple functions, such as thermal dissipation, protection against oxidative stress caused by light, modulation of the structure of thylakoid membrane, involving in blue light signal transduction and regulating the synthesis ofABA （Abscisic acid）. VDE （Violaxanth de-epoxidase） and ZE （zeaxanth epoxidase）, are involved in xanthophyll cycle. This paper outlined the functions of xanthophylls cycle and its relative enzymes.展开更多
There are two approaches to metaphysics that concern language,the logical and the linguistic. Zeno Vendler,who took the linguistic one,distinguished with transformational techniques between two semantic categories,nam...There are two approaches to metaphysics that concern language,the logical and the linguistic. Zeno Vendler,who took the linguistic one,distinguished with transformational techniques between two semantic categories,namely fact and event,and regarded them as corresponding respectively to a metaphysical category of beings. In doing this he presupposed that independent semantic categories could be sorted out,and corresponding categories of beings that are independent of language can be derived. But our analysis of Vendler's case shows that it is not semantic categories but grammar that functions in differentiating event and fact. At least some semantic categories could not be separated from grammar,and this casts doubt on the linguistic approach to metaphysics. If semantic categories are not independent of grammar,we could not derive metaphysics from linguistic study.展开更多
IN the 1990s, art collecting began to be a popular pursuit in China. At that time a large number of middle-aged and young artists carried out artistic exploration, creating numerous works with new artistic concepts an...IN the 1990s, art collecting began to be a popular pursuit in China. At that time a large number of middle-aged and young artists carried out artistic exploration, creating numerous works with new artistic concepts and styles. Active artistic cre-展开更多
文摘Light is a fundamental source of energy but is also potentially harmful to organisms. Plants have evolved a variety of regulatory mechanisms to respond to the naturally varying light conditions. Xanthophyll cycle is now recognized as a key regulator and photoprotective mechanism found ubiquitously in plants. Xanthophyll cycle has multiple functions, such as thermal dissipation, protection against oxidative stress caused by light, modulation of the structure of thylakoid membrane, involving in blue light signal transduction and regulating the synthesis ofABA （Abscisic acid）. VDE （Violaxanth de-epoxidase） and ZE （zeaxanth epoxidase）, are involved in xanthophyll cycle. This paper outlined the functions of xanthophylls cycle and its relative enzymes.
文摘There are two approaches to metaphysics that concern language,the logical and the linguistic. Zeno Vendler,who took the linguistic one,distinguished with transformational techniques between two semantic categories,namely fact and event,and regarded them as corresponding respectively to a metaphysical category of beings. In doing this he presupposed that independent semantic categories could be sorted out,and corresponding categories of beings that are independent of language can be derived. But our analysis of Vendler's case shows that it is not semantic categories but grammar that functions in differentiating event and fact. At least some semantic categories could not be separated from grammar,and this casts doubt on the linguistic approach to metaphysics. If semantic categories are not independent of grammar,we could not derive metaphysics from linguistic study.
文摘IN the 1990s, art collecting began to be a popular pursuit in China. At that time a large number of middle-aged and young artists carried out artistic exploration, creating numerous works with new artistic concepts and styles. Active artistic cre-
