Diffusion Across a Cell Membrane. Diffusion is the movement of a substance across a membrane. Substances diffuse across cell membranes in a process known as passive transport. This means that the cell does not expend any energy in transporting substances across the cell membrane. Instead, substances move down their concentration gradient as a result of random thermal motion.
401k and profit sharing plans are both forms of retirement plans. They allow employees to make pre-tax contributions to an account where contributions and earnings are not taxed until distributed. Some 401k plans require an employer to make contributions to a plan.
As a general principle, a capital receipt is non-taxable while a revenue receipt is taxable. In an old Mumbai High Court ruling, it was held that monthly alimony, being a regular and periodic return from a decree, would constitute taxable income. In contrast, the lump sum payment received was held to be a capital receipt and, hence, not taxable for the former spouse.