紫藤的缠绕茎与手性（The twining stems and chirality of the Wisteria sinensis）.docVIP

紫藤的缠绕茎与手性（The twining stems and chirality of the Wisteria sinensis） The twining stems and chirality of the Wisteria sinensis Hua Jie Liu In the vigorous and green world of plants, there are many climbing vines. They or around each other, or with other support spiral up, bring full of green and shade for people everywhere in the scorching summer, in autumn brings numerous harvest. If you look at these plants carefully, you will see that their stems are spirally twisted, often in a particular direction. This phenomenon contains one of the basic properties of nature - chirality. Ubiquitous chirality The word chirality derives from the Greek word cheir, which refers to the difference between the left hand and the right hand. There are only two kinds of chiral and chiral substances: left hand and right hand. Sometimes, in contrast, a chiral chirality (no) is used to refer to it as a neutral chiral. The left hand is represented by L, the right hand is expressed by D, and the neutral chirality is expressed by M. The left hand (sex) and the right hand (sex) depend solely on the translation and rotation can not completely coincide, and must be mirrored to coincide, so the symmetry is also known as mirror symmetry. A chiral spiral, usually defined as stretching out a hand, let the thumb pointing axial spiral, the other four fingers clenched, and from the palm to four fingertips a forward direction; if the spiral coincides with outstretched left hand, the left hand of the spiral (vertical axial view, spiral is the clockwise), and for the right hand (the vertical axial view, spiral is anti clockwise). In meteorology, definitions are the same. In the northern hemisphere, a low pressure zone forms a left-handed cyclone, and a high pressure zone forms a right-handed cyclone. The opposite is true in the southern hemisphere. Chirality can describe things extremely diverse, to the galaxys spiral arms, planetary rotation, atmospheric cyclone, small to parity nonconservation mineral cr