Warnings. 1  Don't become obsessed with security. 2  Even the most solid lock system is worthless if the frame around the door is weak. 3  If you're not used to locking your doors and you have a door that you can lock without a key, take care to remember your keys whenever you leave the house.
Bacteria that cause urinary tract infections invade bladder cells. Scientists at Washington University School of Medicine in St. Louis have found definitive proof that some of the bacteria that plague women with urinary tract infections (UTIs) are entrenched inside human bladder cells. The finding confirms a controversial revision of scientistsâ model of how bacteria cause UTIs. Previously, most researchers assumed that the bacteria responsible for infections get into the bladder but do not invade the individual cells that line the interior of the bladder.
Figure 1 ~ How Ebola virus infects human cells. (A) The Ebola virus is enclosed in a package that contains RNA, its genetic âblueprintâ for reproduction. (B) Ebola has a protein called glycoprotein that sticks out of its membrane and binds to receptors (in red) on the cell surface. (C) The binding of these receptors triggers a cell âeatingâ process called macropinocytosis, resulting in the virus being engulfed by a wave-like motion of the cell membrane.