For medicinal and poisonous properties of plants are known since ancient times. About 50% of the total number of drugs that are produced in the world as a raw material base used matters of plant origin. To provide a sufficient amount of herbal products used not only wild plants, but also artificially cultivated on plantations. Revenue from this kind of exploitation of forests and forest […]
As the name says, these ropeway have motor. In relation to the mode of transport of wood, of skidders are distinguished by the fact that wood is raised off the ground. In most ropeway motor is used for traction in one direction, either cargo, or wagon. In the opposite direction used the force of gravity.
From less valuable parts of the downed trees are made assortments such as firewood, short technical wood and cellulose wood. These assortments (stacked wood), put together to the stack between the pegs placed vertically, measured spatial meters which are for further manipulation converted to cubic meters using reduction coefficients. One stacked meter represents a space of one cubic meter, which is filled with complex wood […]
Insect body is enveloped in a solid body shell – the skin, which in arthropods gives the body a constant shape and firmness, and presents an external skeleton. It’s composed of a number of articles, segments or wrists, which are made of thickened plates or sklerits. Boards are firmly connected to each other by elastic intersegment membranes. Physical segments are grouped into three regions: head […]
The cell is the basic structural and functional unit of all living organisms. It is a very complex system in which all structure and function interconnected, dependent and controlled of the whole. Today it is considered that the cell needs to maintain life contains the necessary minimum of three structurally-chemical systems: