One of the most studied roles of ceramide pertains to its function as a proapoptotic molecule. Apoptosis , or Type I programmed cell death , is essential for the maintenance of normal cellular homeostasis and is an important physiological response to many forms of cellular stress. Ceramide accumulation has been found following treatment of cells with a number of apoptotic agents including ionizing radiation,   UV light,  TNF-alpha ,  and chemotherapeutic agents . This suggests a role for ceramide in the biological responses of all these agents. Because of its apoptosis-inducing effects in cancer cells, ceramide has been termed the "tumor suppressor lipid". Several studies have attempted to define further the specific role of ceramide in the events of cell death and some evidence suggests ceramide functions upstream of the mitochondria in inducing apoptosis. However, owing to the conflicting and variable nature of studies into the role of ceramide in apoptosis, the mechanism by which this lipid regulates apoptosis remains elusive. 
On HP dv6 2005tx, the faulty power supply had to be replaced by a new one, now sometime the charging does start unless I disconnect the power pack and reconnect it, otherwise the battery goes flat to the end.
But the main trouble is when connected to a particular TCP port server in America (to feed market charts) I get disconnected when I am on the power pack but not when the laptop is running on the battery only.
I use WLAN to the modem/router, and didn’t try a cable yet.
Very strange indeed, what will be the faulty part to be replaced?
Thanks for helping.