How to write for a scientific Journal?

Its very simple. As simple as imitating a baby and doing the baby talk!!

Remember, two things, write and think like a baby. No complex strutures, or pompous use of language. Small sentences.

Simple and easy English. 

Subject - verb - object. 

Say things directly.

Conceive the idea that you want to convey clearly in the mind first. If the idea is clear, it can be conveyed in the most lucid manner in shortest possible sentences. Remeber, only clumpsy ideas need long sentences. It requires a conscious effort, but its not impossible. Have your grammer right. If in doubt (necessary) have it checked by an expert. You gain a week or a fortnight..

An expert across the street may complete the job in a day or two. If the same is done by the administrative manager  of the journal, it may take more than two weeks. Worse still, your article may even get summarily rejected for poor English.

Follow the 'specific' instructions of the journal very very carefully, word by word. This is the least, expected from a scientist aspiring to publish in a peer reviewed scientific journal.  

Maintain the sequence. IMRD -Meaning, Introduction, methods, results and discussion, followed by conclusions. 

Never repeat any statement/ idea/ fact in the body of the article.