In regards to DNA use being affected by Love/Fear emotions I'd agree. If it was only in a strict chemical sense the different chemicals your brain produces when at one end of that spectrum or the other could easily effect the ways a cell's rhibosomes function. Turning some on and off depending on mood, and in biological sense we are all only the proteins that our rhibosomes produce.
That link has some interesting results. Looking around online about Vladimir Poponin, it looks like a legit experiment, published and everything.
I have always noticed that happy people heal faster and get sick less than unhappy people, and Poponin's results were able to actually quantifty it....very cool.
I'd be interested though in seeing how it differs between cultures. Like if the effect is less or more, based on the importance society puts on love and community. The tribes in the Amazon come to my mind since some of them lack words to express the negative feelings so common in 1st world societys.
And what about animals, would maybe an elephant have the same effect seeing it's own family compared to finding the bones/carcass of a loved one? I would love to see more done in this area of science.
The emotion connection reminds me of the experiment done with ice crystals. Different emotions or music produce radically different crystals. Here is a link with a few pictures too. (sorry about the popup after like 10 seconds)
Masaru Emoto: Messages from Water
AND as for summing up all emotion in two extremes and their infiniate combinations. It might not be easy to apply it to every situation, but it seems just a plausable as a host of different individual emotions seperate from each other. Physics has taught me that one simple "small" of rules/particals can express themselves in 144 elements +, and 4 forces that we know fo so far, why not emotions too?