Nitrogen isotope compositions in sedimentary rocks (d 15 N sed) are routinely used for
reconstructing Cenozoic N-biogeochemical cycling and are also being increasingly applied …

Preserved melanin pigments have been discovered in fossilised integumentary appendages
of several amniote lineages (fishes, frogs, snakes, marine reptiles, non‐avialan dinosaurs …

Understanding the global redox state of the oceans and its cause-and-effect relationship
with periods of widespread organic-carbon deposition is vital to interpretations of Earth's …

The first of the 'Big Five'Phanerozoic mass extinctions occurred in tandem with an episode of
glaciation during the Hirnantian Age of the Late Ordovician. The mechanism or change in …

The presented review considers the currently relevant methods for studying petroleum
porphyrins. For this purpose, the experimental approaches used during the investigation of …

The degree to which ocean deoxygenation will alter the function of marine communities
remains unclear but may be best constrained by detailed study of intervals of rapid warming …

The carbon and nitrogen isotopic signatures of chloropigments and porphyrins from the
sediments of redox‐stratified lakes and marine basins reveal details of past biogeochemical …

Heme B is an iron-coordinated tetrapyrrole molecule that acts as a cofactor in hemoproteins.
It is expected to be ubiquitous in the environment, as b-type hemoproteins catalyze a variety …

A method is described for the identification and quantification of Cu, Ni, VO, Zn and Mn
metalloporphyrins in geological samples using a high performance liquid chromatography …

Nitrogen isotope analysis of chloropigments provides information on the sources of
nitrogenous nutrients assimilated by phytoplankton. The abundant, ubiquitous chlorophyll a …