Pre-exposure prophylaxis (PrEP) is a course of HIV drugs taken daily by HIV negative people most at risk of HIV to reduce their risk of HIV infection. Truvada is currently the only drug approved for use as PrEP. Truvada is a single pill that is a combination of two anti-HIV drugs, tenofovir and emtricitabine.
Astronomical spectroscopy is one of the most powerful tools used by astronomers to gain a fundamental understanding of our universe. Astronomical spectroscopy is a technique in which the absorption and emission of electromagnetic radiation from stars and other celestial objects are studied.he absorption and or emission spectra of a molecule generally consist of a number of lines. These lines correspond to the discrete differences in the internal energy modes of a molecule.
Infrared (IR) absorption spectroscopy is the measurement of the wavelength and intensity of the absorption of mid-infrared light by a sample.Mid-infrared light (2.5 - 50 Âµm, 4000 - 200 cm-1) is energetic enough to excite molecular vibrations to higher energy levels.R spectroscopy is used to confirm the identify of a particular compound and as a tool to help determine the structure of a newly synthesized molecule (with NMR spectroscopy and mass spectrometry). Mechanism of IR absorption. dipole moment operator: Âµ = Âµo + (r-re)(dÂµ/dr) + ... higher terms.