Risperdal and Seizures. FDA ALERT [04/2005] Risperdal is a type of medicine called an atypical antipsychotic. FDA has found that older patients treated with atypical antipsychotics for dementia had a higher chance for death than patients who did not take the medicine. This is not an approved use.
Introduction. Chromosomal DNA replication occurs during a phase of the cell cycle known as the S phase. Although the length of the S phase can vary significantly between different cell types, several absolute controls exist that dictate when and how many times in a cell cycle DNA replication can occur.
S phase, or synthesis phase, is the time during which centromeres are replicated. This makes sense, since centromeres are part of chromosomes and chromosomes are replicated during S phase. The cell cycle has two general phases. Interphase is the preparation phase before cell division, and mitosis the phase in which the dividing happens.