Chirality (chemistry) Chirality /kaÉªËrÃ¦lÉªti/ is a geometric property of some molecules and ions. A chiral molecule/ion is non-superposable on its mirror image. The presence of an asymmetric carbon center is one of several structural features that induce chirality in organic and inorganic molecules.
Increasingly, Klebsiella bacteria have developed antimicrobial resistance, most recently to the class of antibiotics known as carbapenems. Klebsiella bacteria are normally found in the human intestines (where they do not cause disease). They are also found in human stool (feces). In healthcare settings, Klebsiella infections commonly occur among sick patients who are receiving treatment for other conditions.
Helicobacter pylori â sometimes called H. pylori or HP is a bacterium that causes ulcers. H. pylori is also a risk factor for stomach cancer. If prescribed, it is very important to complete an entire course of antibiotics for H. pylori. Melena â black very sticky stool, often compared to roof tar. This is a common symptom of a bleeding ulcer. Black stool that looks like melena can be caused by taking iron medications and by drugs like Pepto-Bismol Â® .