Biogenic Iron Preserves Structures during Fossilization: A Hypothesis: Iron from Decaying Tissues May Stabilize Their Morphology in the Fossil Record.

It is hypothesized that iron from biological tissues, liberated during decay, may have played a role in inhibiting loss of anatomical information during fossilization of extinct organisms. Most tissues in the animal kingdom contain iron in different forms. A widely distributed iron-bearing molecule is ferritin, a globular protein that contains iron crystallites in the form of ferrihydrite minerals.

Author Correction: Collective behaviour in 480-million-year-old trilobite arthropods from Morocco.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Collective behaviour in 480-million-year-old trilobite arthropods from Morocco.

Interactions and coordination between conspecific individuals have produced a remarkable variety of collective behaviours. This co-operation occurs in vertebrate and invertebrate animals and is well expressed in the group flight of birds, fish shoals and highly organized activities of social insects. How individuals interact and why they co-operate to constitute group-level patterns has been extensively studied in extant animals through a variety mechanistic, functional and theoretical approaches.

Breast Reconstruction: A Century of Controversies and Progress.

Breast cancer treatment has dramatically changed over the past century. Since Halsted's first description of radical mastectomy in 1882, breast reconstruction has evolved slowly from being considered as a useless or even dangerous procedure by surgeons to the possibility nowadays of reconstructing almost any kind of defect. In this review on the development of breast reconstruction, we outline the historical milestone innovations that led to the current management of the mastectomy defect in an attempt to understand the economic, social and psychological factors, which contributed to slow down its acceptance for several decades.