In the Anthropocene humans have a global impact on the atmosphere and ecosystems. This became first visible with the discovery that man-made chlorine emissions modify stratospheric ozone (O₃) over South Pole. More recent evidence suggests that atmospheric chemistry of bromine and iodine radicals dominates the relevance of halogens in the troposphere, and may be more active today than 100 years ago.

All living organisms conserve energy by catalyzing redox biochemical reactions, which constitute respiration.  In most cases, respiration is achieved through the action of metalloenzymes and electron-transfer networks, wherein oxidation of reduced substrates is coupled to reduction of cofactors that pass along the electrons to a terminal oxidant.  The latter is O₂ in aerobic respiration and eukaryotes have no respiratory flexibility at the level of O

Iron(II) and 2-Oxoglutarate (2OG) dependent non-heme iron (Fe(II)/2OG) enzymes catalyze a large array of chemical transformations, including hydroxylation, desaturation, epoxidation, halogenation, epimerization, endoperoxidation, as well as ring expansion/contraction reactions. Many of these transformations are key chemical steps in the biosynthesis of natural products having antibiotic and antimicrobial activities.

This presentation reveals the profound ways in which isotope ratio mass spectrometry (IRMS) can provide information about the geographic origin and history of almost everything around us, including our fellow humans. The presentation explains the ways in which we are and are not exactly what we eat, and it explains how researchers use IRMS measurements of hair to determine the geographic origin and travel histories of animals and humans.

Dr. Todd Harrop and Dr.

The oceans contain the largest proportion of carbon atoms that participate in biogeochemical cycles on Earth's surface over timescales ranging from less than a second to thousands of years.  Radiocarbon (¹⁴C) measurements suggests that most (~95 %) of the carbon atoms bound within organic molecules in seawater can persists for thousands of years.  The abundances of these atoms at each time and place in the ocean are complete records of their histories according to the laws of conservation of mass, thermodynamics, and kinetics.&nb

Patients with non-small cell lung cancer (NSCLC) harboring activating mutations in the epidermal growth factor receptor (EGFR) show significant progression-free survival benefit when they are treated with EGFR tyrosine kinase inhibitors (TKIs), have been recommended as the first-line therapy for NSCLC patents with EGFR-sensitizing mutations.¹ Unfortunately, the vast majority acquire resistance after 9-12 months of treatment.

Single-cell analysis is an active research area focused on deciphering cellular processes from a single living cell.¹ Various crucial biological phenomena are either invisible or only partially characterized when analyzed with standard techniques that utilize bulk cell populations or entire tissues.