Dimitri D Deheyn

Dimitri D Deheyn
University of California, San Diego | UCSD · Scripps Institution of Oceanography (SIO)

PhD in Marine Science

About

157
Publications
41,648
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Introduction
My research deals with light production (via bioluminescence, fluorescence) and light manipulation (via structural coloration, pigmentation) in organisms, embracing the full range of scientific opportunities, from fundamental biochemical exploration and mechanistic description of biophotonic processes to potential application for biomedical, bioengineering and/or biotechnological applications. Changes of light production and/or coloration are also used as early proxy for health (ecotoxicology).

Publications

Publications (157)
Article
Full-text available
Pollution – unwanted waste released to air, water, and land by human activity – is the largest environmental cause of disease in the world today. It is responsible for an estimated nine million premature deaths per year, enormous economic losses, erosion of human capital, and degradation of ecosystems.Ocean pollution is an important, but insufficie...
Article
Melanin is ubiquitous in living organisms across different biological kingdoms of life, making it an important, natural biomaterial. Its presence in nature from microorganisms to higher animals and plants is attributed to the many functions of melanin, including pigmentation, radical scavenging, radiation protection, and thermal regulation. General...
Article
Full-text available
As global production of textiles rapidly grows, there is urgency to understand the persistence of fabrics in the marine environment, particularly from the microfibers they shed during wearing and washing. Here, we show that fabrics containing polyester (one of the most common plastics) remained relatively intact (viz., with a limited biofilm) after...
Article
Although melanin is one of the most ubiquitous polymers in living systems, our understanding of its molecular structure, biosynthesis and biophysical properties has been limited to only a small number of organisms other than humans. This is in part due to the difficulty associated with isolating pure melanin. While purification methods exist, they...
Article
Full-text available
Photosynthetic microalgae are an attractive source of food, fuel, or nutraceuticals, but commercial production of microalgae is limited by low spatial efficiency. In the present study we developed a simple photosynthetic hydrogel system that cultivates the green microalga, Marinichlorella kaistiae KAS603, together with a novel strain of the bacteri...
Preprint
Full-text available
Photosynthetic microalgae are an attractive source of food, fuel or nutraceuticals, but commercial production of microalgae is limited by low spatial efficiency. In the present study, we developed a simple photosynthetic hydrogel system that cultivates the green microalga, Marinichlorella kaistiae KAS603, together with a novel strain of the bacteri...
Article
Full-text available
Skin color patterns are ubiquitous in nature, impact social behavior, predator avoidance, and protection from ultraviolet irradiation. A leading model system for vertebrate skin patterning is the zebrafish; its alternating blue stripes and yellow interstripes depend on light-reflecting cells called iridophores. It was suggested that the zebrafish's...
Article
Structurally colored supraparticles, formed from dispersed nanoparticle building blocks through self-assembly, have tremendous potential for applications in displays, coatings, paints, inks, and cosmetics. Mechanical stability and solvent compatibility of supraparticles is critical in these applications. Here, we describe the scalable synthesis of...
Article
Full-text available
Background: Pollution – unwanted waste released to air, water, and land by human activity – is the largest environmental cause of disease in the world today. It is responsible for an estimated nine million premature deaths per year, enormous economic losses, erosion of human capital, and degradation of ecosystems. Ocean pollution is an important, b...
Article
Full-text available
Background: Pollution – unwanted waste released to air, water, and land by human activity – is the largest environmental cause of disease in the world today. It is responsible for an estimated nine million premature deaths per year, enormous economic losses, erosion of human capital, and degradation of ecosystems. Ocean pollution is an important, b...
Article
Full-text available
Abstract Coral reefs are naturally exposed to daily and seasonal variations in environmental oxygen levels, which can be exacerbated in intensity and duration by anthropogenic activities. However, coral’s diel oxygen dynamics and fermentative pathways remain poorly understood. Here, continuous oxygen microelectrode recordings in the coral diffusive...
Article
The functions of secreted animal mucuses are remarkably diverse, and include lubricants, wet adhesives, protective barriers, and mineralizing agents. Although present in all animals, many open questions related to the hierarchical architectures, material properties, and genetics of mucus remain. Here we summarize what is known about secreted mucus...
Article
The clingfish attaches to rough surfaces with considerable strength using an intricate suction disc, which displays complex surface geometries from structures called papillae. However, the exact role of these structures in adhesion is poorly understood. To investigate the relationship between papillae geometry and adhesive performance, we developed...
Article
The silica cell walls of diatoms, the abundant microalga 1-100 μm in size, show a highly ordered hierarchical porosity and are widely available through their fossilized form known as diatomite. The goal of this research was to use this cost-effective source of porous silica in a unidirectional freezing process called ice-templating, or freeze casti...
Article
Previous research in biology and physics speculates that high-frequency electromagnetic fields may be an unexplored method of cellular and subcellular communication. The predominant theory for generating electric fields in the cell is mechanical vibration of charged or polar biomolecules such as cell membranes or microtubules. The challenge to this...
Article
Full-text available
Corals have evolved as optimized photon augmentation systems, leading to space-efficient microalgal growth and outstanding photosynthetic quantum efficiencies. Light attenuation due to algal self-shading is a key limiting factor for the upscaling of microalgal cultivation. Coral-inspired light management systems could overcome this limitation and f...
Preprint
Skin color patterns are ubiquitous in nature, evolve rapidly, and impact social behavior, predator avoidance, and protection from ultraviolet irradiation. A leading model system for vertebrate skin patterning is the zebrafish; its alternating blue stripes and yellow interstripes depend on guanine crystal-containing cells called iridophores that ref...
Article
Full-text available
Ferritin protein is involved in biological tissues in the storage and management of iron - an essential micro-nutrient in the majority of living systems. While there are extensive studies on iron-loaded ferritin, its functionality in iron delivery is not completely clear. Here, for the first time, differential pulse voltammetry (DPV) has been succe...
Article
Full-text available
This is a peer-reviewed commentary on the various issues associated with the different types of plastics found throughout our ecosystems. We review the difference between plastic debris, microplastics and microfibers, and discuss the various means by which these problems are addressed. We especially highlight the use or need of new technology to he...
Article
Adhesion is difficult to achieve on rough surfaces both in air and underwater. In nature, the northern clingfish (Gobiesox maeandricus) has evolved the impressive ability to adhere onto substrates of various shapes and roughnesses, while subject to strong intertidal surges. The suction disc of the clingfish relies on suction and friction to achieve...
Article
Full-text available
Microtubules are tubular proteins that form part of the cytoskeleton in eukaryotic cells. Because of their unique mechanical properties, many studies have theorized microtubules could show high-frequency mechanical vibrations. Others have further suggested these vibrations of the electrically polar microtubules could be a source of electric fields...
Article
Deep-sea fishes living in darkness have evolved unique predation and communication mechanisms involving bioluminescence and other stratagems. Another adaptation is the transparency of the teeth of several species, which is hypothesized to provide stealth for predation. We investigated the transparent teeth of the dragonfish and discovered that it i...
Article
Full-text available
Understanding genetic and cellular bases of adult form remains a fundamental goal at the intersection of developmental and evolutionary biology. The skin pigment cells of vertebrates, derived from embryonic neural crest, are a useful system for elucidating mechanisms of fate specification, pattern formation, and how particular phenotypes impact org...
Preprint
Full-text available
Understanding genetic and cellular bases of adult form remains a fundamental goal at the intersection of developmental and evolutionary biology. The skin pigment cells of vertebrates, derived from embryonic neural crest, are a useful system for elucidating mechanisms of fate specification, pattern formation, and how particular phenotypes impact org...
Article
Full-text available
Theory suggests that the direct transmission of beneficial endosymbionts (mutualists) from parents to offspring (vertical transmission) in animal hosts is advantageous and evolutionarily stable, yet many host species instead acquire their symbionts from the environment (horizontal acquisition). An outstanding question in marine biology is why some...
Article
Full-text available
Corals and humans represent two extremely disparate metazoan lineages and are therefore useful for comparative evolutionary studies. Two lipid-based molecules that are central to human immunity, platelet-activating factor (PAF) and Lyso-PAF were recently identified in scleractinian corals. To identify processes in corals that involve these molecule...
Article
Dielectric elastomer actuators (DEAs) are a promising enabling technology for a wide range of emerging applications, including robotics, artificial muscles, and microfluidics. This is due to their large actuation strains, rapid response rate, low cost and low noise, high energy density, and high efficiency when compared with alternative actuators....
Preprint
Full-text available
Marine worms of the genus Odontosyllis (Syllidae, Annelida) are well known for their spectacular bioluminescent courtship rituals. During the reproductive period, the benthic marine worms leave the ocean floor and swim to the surface to spawn, using bioluminescent light for mate attraction. The behavioral aspects of the courtship ritual have been e...
Article
The use of light and colors in nature has been fascinating many people from all ages, all classes and from all over the world. Not surprisingly, a considerable community of researchers, scientists and engineers exists, trying to reveal these secrets and even trying to mimick those natural methods to produce light and color in modern technologies. T...
Article
Full-text available
Colour produced by wavelength-dependent light scattering is a key component of visual communication in nature and acts particularly strongly in visual signalling by structurally-coloured animals during courtship. Two miniature peacock spiders (Maratus robinsoni and M. chrysomelas) court females using tiny structured scales (~ 40 × 10 μm2) that refl...
Article
Ferritin, a multimeric cage-like enzyme, is integral to iron metabolism across all phyla through the sequestration and storage of iron through efficient ferroxidase activity. While ferritin sequences from around 900 species have been identified, crystal structures from only 50 species have been reported, the majority from bacterial origin. We recen...
Article
This article is a News and Views for the article of Moyroud et al. 2017 (doi:10.1038/nature24285) The petals of a range of flowers harbour repeated patterns of nanostructures that show similar levels of disorder across species. This degree of disorder produces a blue halo of scattered light that helps bees to find flowers.
Article
We characterize the lengthscale-dependent rheological properties of mucus from the ubiquitous Chaetopterus marine worm. We use optically trapped probes (2–10 μm) to induce microscopic strains and measure the stress response as a function of oscillation amplitude. Our results show that viscoelastic properties are highly dependent on strain scale (l)...
Data
Distributions of trapped probe positions for varying probe sizes in water (left) and mucus (right). Each distribution is the cumulative laser deflection data for 10 different trapped stationary probes (color scheme as in S1 Fig), recorded at 2 kHz with a PSD for ~20 s for each probe. Each distribution is fit to a Gaussian curve with a variance σ2 t...
Data
Diffusion coefficients of coated microspheres in mucus as compared to water. 2 μm (green) and 6 μm (blue) probes embedded in mucus and in water were imaged and tracked over time to determine the mean-squared displacements in the x and y directions. The resulting diffusion coefficients, Dmucus and Dwater, calculated via the Einstein relation <Δx2> =...
Data
Active microrheology measurements of water viscosity measured for different probe sizes and different oscillation amplitudes. Measurement techniques and instrumentation were identical to those shown in Fig 3 and described in Methods. As shown the measured viscosity of water is largely independent of probe size and oscillation amplitude as expected...
Article
Full-text available
Cryptic colouration in crustaceans, important for both camouflage and visual communication, is achieved through physiological and morphological mechanisms that are sensitive to changes in environmental conditions. Consequently, ocean warming and ocean acidification can affect crustaceans' biophotonic appearance and exoskeleton composition in ways t...
Chapter
Full-text available
Coral reefs are built by colonial cnidarians that establish a symbiotic relationship with dinoflagellate algae of the genus Symbiodinium. The processes of photosynthesis, calcification, and general metabolism require the transport of diverse ions across several cellular membranes and generate waste products that induce acid/base and oxidative stres...
Article
Calcified marine organisms typically experience increased oxidative stress and changes in mineralization in response to ocean acidification and warming conditions. These effects could hinder the potency of animal weapons, such as the mantis shrimp’s raptorial appendage. The mechanical properties of this calcified weapon enable extremely powerful pu...
Article
Full-text available
We performed an experiment in a laboratory flume to test the effects of water flow speed and the concentration of aqueaous copper on the feeding behavior, growth rate, and accumulation of copper in the tissues of juvenile polychaetes Polydora cornuta. The experiment included two flow speeds (6 or 15 cm/s) and two concentrations of added copper (0 o...
Poster
Full-text available
This poster summarizes the interesting properties of swell sharks, including their ability to produce fluorescence. This poster is used to provide a quick snapshot of interesting properties from these animals to the lay person. Efficient public outreach via Squidtoons (http://www.squidtoons.com).
Article
The blue glow of the mucus from Chaetopterus involves a photoprotein, iron and flavins. Identity and respective role of these components remain, however, largely unresolved today, likely because of viscosity issues and inhibition of this system by oxidizers conventionally used to track bioluminescence activity. Here, we used gentle centrifugation t...
Article
Full-text available
Snow algae and green algae living in aeroterrestrial habitats are ideal objects to study adaptation to high light irradiation. Here,we used a detailed description of the spectral properties as a proxy for photo-acclimation/protection in snow algae (Chlamydomonas nivalis, Chlainomonas sp. and Chloromonas sp.) and charophyte green algae (Zygnema sp.,...
Article
Full-text available
Green Fluorescent Protein (GFP) was originally found in cnidarians, and later in copepods and cephalochordates (amphioxus) (Branchiostoma spp). Here, we looked for GFP-encoding genes in Asymmetron, an early-diverged cephalochordate lineage, and found two such genes closely related to some of the Branchiostoma GFPs. Dim fluorescence was found throug...
Article
Full-text available
We characterize the scale-dependent rheological properties of mucus from the Chaetopterus marine worm and determine the intrinsic lengthscales controlling distinct rheological and structural regimes. Mucus produced by this ubiquitous filter feeder serves a host of roles including filtration, protection and trapping nutrients. The ease of clean mucu...
Article
Full-text available
Biofluorescence has recently been found to be widespread in marine fishes, including sharks. Catsharks, such as the Swell Shark (Cephaloscyllium ventriosum) from the eastern Pacific and the Chain Catshark (Scyliorhinus retifer) from the western Atlantic, are known to exhibit bright green fluorescence. We examined the spectral sensitivity and visual...
Article
The ultrastructure of the self-constructed tube housing of the bioluminescent marine worm, Chaetopterus sp. re- veals that the bio-nanocomposite tube comprises of multiple non-woven plies of multi-axially oriented organic nanofilaments (ø 50–1100 nm) cemented together by an unstructured organic matrix binder. The thin-walled, impermeable tubes are...
Article
Full-text available
Slight shifts in arrangement within biological photonic nanostructures can produce large color differences, and sexual selection often leads to high color diversity in clades with structural colors. We use phylogenetic reconstruction, electron microscopy, spectrophotometry, and optical modeling to show an opposing pattern of nanostructural diversif...
Article
Nature provides remarkable examples of mass-produced microscale particles with structures and chemistries optimized by evolution for particular functions. Synthetic chemical tailoring of such sustainable biogenic particles may be used to generate new multifunctional materials. Herein, we report a facile method for the development of bioenabled core...
Research
Full-text available
I am organizing this cross-disciplinary conference to bring together biologists, chemists, physicists, and engineers with interests in light production, fluorescence, light scattering and polarization, and optics and biophotonics in general. The conference will include fundamental aspects of these topics as well as more directed applications, and w...
Article
The global nature of ocean acidification transcends habitats, ecosystems, regions, and science disciplines. The science community has recognized that the biggest challenge in proceeding to the next stage in understanding the mechanisms by which past, current, and future OA conditions impact ecosystems and the societies that depend on them goes beyo...
Article
Structural colors arising from interactions of light with submicron scale periodic structures, have been found in many species across all taxa, serving multiple biological functions including sexual signaling, camouflage and aposematism. Directly inspired by the extensive use of self-assembled melanosomes to produce colors in avian feathers, we set...
Conference Paper
Brittlestars (Echinoderms) are a large group of marine invertebrates, from which many species are able to produce bioluminescence. The light is used for ecological functions associated with defense. Hence, the larger and more intense the bioluminescent display the more effective it would be. Here, we report on our study to determine whether ossicle...
Data
Full-text available