Protospacer Adjacent Motif (PAM)

In cell biology, hydrogen peroxide is not just a damaging byproduct of metabolism but also a crucial second messenger in redox signaling pathways. At low, controlled concentrations, it can reversibly oxidize specific cysteine residues on proteins, such as phosphatases and transcription factors. This modification alters protein activity, thereby regulating processes like cell growth, differentiation, and immune responses.

Biomimicry is an innovation approach that seeks sustainable solutions to human challenges by emulating nature's time-tested patterns and strategies. The core idea is that nature, through 3.8 billion years of evolution, has already solved many of the problems we are grappling with. It involves observing and learning from the designs and processes of organisms and ecosystems to create more sustainable designs.

Geckos can climb smooth vertical surfaces due to the unique structure of their toe pads. These pads are covered in millions of microscopic hairs called setae, which are further split into hundreds of even smaller spatulae. This hierarchical structure maximizes surface area, allowing for adhesion through weak intermolecular van der Waals forces, collectively generating a strong adhesive force.

Gene co-option, or gene recruitment, is the evolutionary process where a gene or network of genes is employed for a new function, often in a different developmental context. This is a primary mechanism for the evolution of novel traits without requiring the creation of new genes. For example, crystallins, the transparent structural proteins of the eye lens, were co-opted from metabolic enzymes.

In some organisms like the jellyfish Aequorea victoria, the initial bioluminescent reaction produces blue light. This energy is then transferred to a secondary protein, the Green Fluorescent Protein (GFP), via Förster resonance energy transfer (FRET). GFP absorbs the blue light and re-emits it as green light, effectively shifting the color of the luminescence.

Deep homology describes cases where morphologically disparate features in different species, long considered analogous, are found to be controlled by the same conserved "toolkit" genes. A classic example is the PAX6 gene, which initiates eye development in species as different as mice and fruit flies, despite their eyes having vastly different structures and independent evolutionary origins.

A chemical process that mimics natural rock weathering to permanently store CO2. It involves reacting carbon dioxide with minerals containing metal oxides, such as magnesium oxide (MgO) and calcium oxide (CaO), to form stable carbonate minerals like magnesite (\(MgCO_3\)) and calcite (\(CaCO_3\)). This method offers very secure, long-term storage with a low risk of leakage.