Thylakoid Definition. A thylakoid is a sheet-like membrane-bound structure that is the site of the light-dependent photosynthesis reactions in chloroplasts and cyanobacteria. It is the site that contains the chlorophyll used to absorb light and use it for biochemical reactions.
Turn the oven down to 200ÂºF and cook for about 1 hour per pound. Check your meat with a thermometer after 2.5 hours for a 2.5 pound roast. Follow these guidelines for doneness when checking temperature 1  : 130ÂºF Rare.
If you don't have access to a grill though: Heat olive oil in a pan until nearly smoking. Sear the steak on both sides until very brown. Transfer to an oven proof pan, add your mushrooms, place a pat of butter on top of the meat and bake at 425 for about 10 minutes to finish. This would be for a steak at least an inch thick. If it's less than that, then searing in the pan is really all you'll need to do. While your steak is in the oven, add 2 tbls heavy cream, fresh cracked pepper and a little red wine to the pan you seared in. Reduce this down and you'll have a nice pan sauce.