Найти книгу: "Wood Quality and its Biological Basis"

Wood is the most versatile raw material available to man. It is burned as fuel, shaped into utensils, used as a structural engineering material, converted into fibres for paper production, and put to newer uses as a source of industrial chemicals. Its quality results largely from the chemical and physical structure of the cell walls of its component fibres, which can be modified in nature as the tree responds to physical environmental stresses. Internal stresses can accumulate, which are released catastrophically when the tree is felled, often rendering the timber useless. The quality of timber as an engineering material also depends on the structure of the wood and the way in which it has developed in the living tree. Tree improvement for quality cannot be carried out without an understanding of the biological basis underlying wood formation and structure. This volume brings together the viewpoints of both biologists and physical scientists, covering the spectrum from the formation of wood to its structure and properties, and relating these properties to industrial use. This is a volume for researchers and professionals in plant physiology, molecular biology and biochemistry.

Using the concept of three-electron bond we can represent the actual electron structure of benzene and other molecules, explain specificity of the aromatic bond and calculate the delocalization energy. The aromatic bond is a three-electron bond in flat cyclic systems with a specific interaction of electrons through the cycle. In benzene formed a new type of chemical bonds – an aromatic bond, which has a multiplicity of more than 1.5 (1.66) http://vixra.org/author/bezverkhniy_volodymyr_dmytrovych

The collection is called «Dirty equality» after the name of the first poem. And indeed, the Constitution provides equal rights for all citizens, but not everyone can realize them. Article of the Constitution No. 40 guarantees the right of citizens to housing. And where is it, is this right? The city line in St. Petersburg has been standing for 37 years, today give (if given, of course) housing for those who stood in line until 1980.