Acne, including cystic acne, is not caused by: 1  Chocolate, nuts, or greasy foods. 2  Most other dietary choices-research has found an association between intake of milk products and acne, as well as a high glycemic index diet and acne. 3  Poor hygiene or inadequate face washing. 4  Masturbation or sex.
Overview. Burr oak, also spelled bur oak, is a tree with many striking features, including crooked branches, large leaves and big acorns.
This is positively gravitropic growth of the shoot/stem. In plants with a wider expanse e.g. trees the branches also grow at an angle to the gravity; sometimes at right angle or even more crooked (see fig taken from www below). This is what we call as 'plageotropic growth. It is not simple bending to approach light.