- published: 25 Oct 2014
- views: 3067
Lignin or lignen is a complex chemical compound most commonly derived from wood, and an integral part of the secondary cell walls of plants and some algae. The term was introduced in 1819 by de Candolle and is derived from the Latin word lignum, meaning wood. It is one of the most abundant organic polymers on Earth, exceeded only by cellulose, employing 30% of non-fossil organic carbon, and constituting from a quarter to a third of the dry mass of wood. As a biopolymer, lignin is unusual because of its heterogeneity and lack of a defined primary structure. Its most commonly noted function is the support through strengthening of wood (xylem cells) in trees.
Global production of lignin is around 1.1 million tonnes per year and is used in a wide range of low volume, niche applications where the form but not the quality is important.
Lignin fills the spaces in the cell wall between cellulose, hemicellulose, and pectin components, especially in tracheid, sclereid and xylem cells. It is covalently linked to hemicellulose and, therefore, crosslinks different plant polysaccharides, conferring mechanical strength to the cell wall and by extension the plant as a whole. It is particularly abundant in compression wood but scarce in tension wood.
Are you sleeping, I wish I was
Are you dreaming, of someone to love
Do you know what I'm thinking but I guess you don't
Cause you'd have to be around to hear my thoughts
Tomorrow's another day, and today is yesterday
And I don't care what you think you have to say
Tomorrow comes and today is gone
And I'm sick and tired of everyone trying to make me
Somebody else
It's funny how you destroyed the better part of me
There's nothing left so there's nothing anybody can see
It's been 6 months now and you think you found everything
In a day I wasn't there, in a way you didn't care
Tomorrow's another day, and today is yesterday
And I don't care what you think you have to say
Tomorrow comes and today is gone
And I'm sick and tired of everyone trying to make me
Somebody else
I didn't settle, I just got lazy
But I could see where you'd make the mistake
I didn't try, I just gave up
It was better to leave than stay
It's easy when you're leaving
It's harder when you try to return
But I haven't got that far yet
And that's a lesson I never want to learn
I should know better and so should you
I m exactly where you left me
There was nothing better to do
Are you still sleeping?
Are you still dreaming?
I m finally leaving but your still mixing
Tomorrow's another day, and today is yesterday
And I don't care what you think you have to say
Tomorrow comes and today is gone
And I'm sick and tired of everyone trying to make me
Somebody else
Somebody else