The simple view of the bonding in methane You will be familiar with drawing methane using dots and crosses diagrams, but it is worth looking at its structure a bit more closely. There is a serious mis-match between this structure and the modern electronic structure of carbon, 1s 2 2s 2 2p x 1 2p y 1.
The second reason for a low vitamin D is that you have primary hyperparathyroidism due to a small tumor in your neck and the body converts all the vitamin D-25 (that your doctor is measuring) to the active Vitamin D-1-25 (that doctors do not measure). This is the blue blob on the graph.
Below are some of the most common factors that contribute to a Vitamin D deficiency: 1  The most probable reason most people are deficient is not consuming recommended levels. 2  Low sun exposure is common in the north and isnât a prevalent issue in South Texas. Nonetheless, low sunlight can result in low Vitamin D levels. The skin pigment melanin reduces the chances of Vitamin D production. Symptoms. There are quite a few signs and symptoms to be aware of if you think you are Vitamin D deficient. 1  However, the only way to know for sure is through blood testing. Below are some symptoms to be aware of if you think youâre lacking Vitamin D: 1  Those with darker skin may require more sun exposure to produce healthy levels of Vitamin D. African Americans are also at a greater risk of being Vitamin D deficient. 2  Depression is also a sign of a Vitamin D deficiency.