October 20, 2007. Doujinshi manga (often shortened to doujin) are non-professional and/or self published comics. Doujinshi manga can be broken into two broad categories: fan-comics and original works. Fan-comics, much like fan-fiction, are based on established properties and created by fans of those properties. Original works are based on the doujinshi-ka's (creator) original ideas.
What is Purchasing Power Parity (PPP)? Why is it important? Purchasing power parity (PPP) is an economic term that calculates the relative value of different currencies.
ATP is important because when it breaks down to form ADP and in turn AMP, the phosphate groups may be transferred to other molecules making them 'more reactive' and making che â¦ mical change more likely. For example ATP provides energy for chemical change in the liver or the retina of the eye for making visual pigments.