求一篇关于营养学方面的英文文献不要整本书,一篇文章就好3000单词左右的

求一篇关于营养学方面的英文文献不要整本书,一篇文章就好3000单词左右的
求一篇关于营养学方面的英文文献
不要整本书,一篇文章就好
3000单词左右的

求一篇关于营养学方面的英文文献不要整本书,一篇文章就好3000单词左右的
Trace elements
The human body is composed by 60 various elements.According to the element in the human body,can be divided into different levels of two kinds of elements and trace elements.The total weight of all the human element,such as the above 0.01 carbon,hydrogen,oxygen,nitrogen,calcium,phosphorus,magnesium,sodium,called macro amount.The total weight of all the human element,such as 0.01% below iron,zinc,copper,manganese,chromium,selenium,molybdenum,cobalt,fluorine,called the trace element.Trace elements in human body,such as zinc content is slim body total weight only three millionth 13.Iron is only 100 PPM.
Trace elements in human body,although the content,but with person's survival and health.They absorb excessive,insufficient,or lack of different degrees of human physiological cause abnormal or disease.The most prominent role of trace element is closely related with the vigor of life,just like a match that size or less of the quantity can exert great physiological function.Note the trace element
Trace elements and human health
Must be directly or indirectly by soil supply.According to the scientific research,so far,has been identified and human health and life of the essential trace elements about 18 kinds,namely with iron,copper,zinc,manganese,chromium,cobalt,nickel,selenium,iodine,fluorine,molybdenum,vanadium,tin,silicon,strontium,boron,rb,arsenic,etc.This each trace element has its special physiological function.Although they are very content in the human body,but some of the human body to maintain metabolism is the decisive is necessary.Once the lack of these essential trace elements,the human body will appear even life-threatening diseases.Such as zinc deficiency can lead to mouth,eyes,rectal or the red,pimples,wen rash.As iron constitutes one of the major components of hemoglobin,lack of iron may cause iron-deficiency anaemia.Foreign had reported:the body contains iron,copper,zinc,all can weaken the immune mechanism to resist disease (power),reduce the disease-resistant ability,fuelling bacterial infections,and the higher mortality after infection.The trace elements in disease,cancer,prolong life etc are also plays a role that cannot be ignored.
Trace elements in human body,although the content of small,but with the long and health.Such as zinc deficiency can lead to mouth,eyes,rectal or the red,pimples and eczema.As iron constitutes one of the major components of hemoglobin,lack of iron may cause iron-deficiency anaemia.Human needs from the various elements in the food.Due to various food contains element types and quantity is not identical,so in the normal diet,coarse,combined with meat or fish is tie-in XiLiang  slant,don't eat,not picky,can satisfy the need of various elements.Conversely,can cause lack of certain elements.
Molecular biology research reveals,trace elements and protein and other organic by groups,formed the enzyme,hormone,vitamin etc biological macromolecules,plays an important physiological and biochemical functions.Trace elements within the first constitutes an important carrier and electronic transfer system.Iron exists in hemoglobin and muscle protein,in their execution of carrying oxygen in the process of oxygen and iron plays an important role.
Enzyme catalysts,life is far more than 1000 body found in the enzyme,about 5
The trace element to close to 70% or activate cells,enzyme system function quite wide:from weak to constitute the highly specific ion effect of compound enzyme and nonmetallic enzymes,metal.Valley Dan Kennedy pulse peroxidase is typical of nonmetal enzyme inhibition,it is free.Remove peroxide.Protect membrane integrity,etc.This enzyme molecule contains four selenium atoms.Zinc is not only the carbonate phenolic enzyme,DNA polymerases and RNA polymerase kinds of enzymes,and a necessary component of enzyme activity with 100.Manganese as ion sex strong trace elements are valid activation agent,can activate enzymes catalysis metal.
Iodine for biosynthesis of thyroid hormone necessary,While maintaining the subject in zinc insulin in structure,every indispensable insulin molecular combining two zinc atom.Vitamin than is the thymus krabi steep and eventually DNA synthesis nuclear gone.love biosynthesis and transcription necessary phenol-o-methyl shift.The molecules of a drill relate to close the atomic structure parts,containing it ring of the compound - goo elim coenzyme is known to the most effective biological catalyst in one of many enzyme plays an unusual molecular rearrangement.The nucleic acid is genetic information carriers.Trace elements of the physical and chemical properties of nucleic acid can be influenced.Various RNA polymerase contains zinc,and nuclear yesterday acid oxidoreductase functions depend on dry iron.