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Kato Y, Ha W, Zheng Z, Negishi L, Kawano J, Kurita Y, Kurumizaka H, Suzuki M. Tropomyosin induces the synthesis of magnesian calcite in sea urchin spines. J Struct Biol 2024; 216:108074. [PMID: 38432597 DOI: 10.1016/j.jsb.2024.108074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 02/09/2024] [Accepted: 02/28/2024] [Indexed: 03/05/2024]
Abstract
Calcium carbonate is present in many biominerals, including in the exoskeletons of crustaceans and shells of mollusks. High Mg-containing calcium carbonate was synthesized by high temperatures, high pressures or high molecular organic matter. For example, biogenic high Mg-containing calcite is synthesized under strictly controlled Mg concentration at ambient temperature and pressure. The spines of sea urchins consist of calcite, which contain a high percentage of magnesium. In this study, we investigated the factors that increase the magnesium content in calcite from the spines of the sea urchin, Heliocidaris crassispina. X-ray diffraction and inductively coupled plasma mass spectrometry analyses showed that sea urchin spines contain about 4.8% Mg. The organic matrix extracted from the H. crassispina spines induced the crystallization of amorphous phase and synthesis of magnesium-containing calcite, while amorphous was synthesized without SUE (sea urchin extract). In addition, aragonite was synthesized by SUE treated with protease-K. HC tropomyosin was specifically incorporated into Mg precipitates. Recombinant HC-tropomyosin induced calcite contained 0.1-2.5% Mg synthesis. Western blotting of sea urchin spine extracts confirmed that HC tropomyosin was present in the purple sea urchin spines at a protein weight ratio of 1.5%. These results show that HC tropomyosin is one factor that increases the magnesium concentration in the calcite of H. crassispina spines.
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Affiliation(s)
- Yugo Kato
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, the University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Woosuk Ha
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, the University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Zehua Zheng
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, the University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Lumi Negishi
- Institute for Quantitative Biosciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Jun Kawano
- Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University, N10 W8, Kita-ku, Sapporo 060-0810, Japan
| | - Yoshihisa Kurita
- Graduate School of Agricultural Science, Kyushu University, 4-46-24 Tsuyazaki, Fukutsu-shi, Fukuoka 811-3304, Japan
| | - Hitoshi Kurumizaka
- Institute for Quantitative Biosciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Michio Suzuki
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, the University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
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Skedros AJ, Skedros JG, Richards BW, Cronin JT. Sea Urchin Spine Embedded in the Sole of the Foot: Eight-Year Radiographic Follow-Up Without Removal. Cureus 2024; 16:e56261. [PMID: 38623121 PMCID: PMC11017367 DOI: 10.7759/cureus.56261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2024] [Indexed: 04/17/2024] Open
Abstract
When sea urchin puncture injuries occur during coastal recreation or work activities, they often affect extremities, such as hands and feet. There is a plethora of information on treatments for these puncture injuries, with the most common among medical professionals being the removal of all partially embedded spines and the removal of as many fully embedded spines as possible. When the spines are deeply embedded and/or fragmented, they might not be removed, especially when they are not located in critical areas such as tendons or joints. This reflects the generally held notion that smaller spines and spine fragments will eventually dissolve or be absorbed. Here we report an unusual case where the tip of a sea urchin spine became embedded in the soft tissue of the sole of the foot of a 21-year-old male after he stepped on one after falling off a kayak off the coast of Oahu, Hawai'i. The deeply embedded spine was not removed. By three weeks after the injury, the patient did not have any symptoms, and eight years later, he was still symptom-free. Radiographs taken one year after the injury showed that the spine had fragmented into two pieces. The smaller piece was about 15% of the size of the original embedded spine, and it had apparently been absorbed (it was not seen on final radiographs eight years later). Analysis of radiographs eight years after the injury showed that the main or large spine fragment was still distinctly detectable in the soft tissue; there was no visible evidence that it had undergone significant absorption or migrated from the original location. The absence of any obvious radiographic rarefaction over eight years is contrary to the lore that sea urchin spines that remain in human soft tissue will exhibit significant, or complete, absorption or dissolution over months to a few years.
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Affiliation(s)
| | - John G Skedros
- Orthopaedic Surgery, Utah Orthopaedic Specialists, Salt Lake City, USA
| | - Brett W Richards
- Orthopaedic Surgery, Utah Orthopaedic Specialists, Salt Lake City, USA
| | - John T Cronin
- Orthopaedic Surgery, Utah Orthopaedic Specialists, Salt Lake City, USA
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Shapkin NP, Khalchenko IG, Drozdov AL, Fedorets AN, Buravlev IY, Andrasyuk AA, Maslova NV, Pervakov KA, Papynov EK. Silica-Containing Biomimetic Composites Based on Sea Urchin Skeleton and Polycalcium Organyl Silsesquioxane. Biomimetics (Basel) 2023; 8:300. [PMID: 37504188 PMCID: PMC10807377 DOI: 10.3390/biomimetics8030300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 06/27/2023] [Accepted: 07/08/2023] [Indexed: 07/29/2023] Open
Abstract
The paper presents an original approach to the synthesis of polycalciumorganyl silsesquioxanes through the reaction of polyorganyl silsesquioxanes [RSiO1.5]n (where R is an ethyl and phenyl radical) with sea urchin skeleton under the conditions of mechanochemical activation. The novelty and practical significance of the present study lies in the use of an available natural raw source as a source of calcium ions to initiate the reaction of calcium silicate formation and create a matrix for the formation of a porous inorganic composite framework. The thermal stability of the introduced silicates, i.e., the ability to maintain a porous structure at high temperatures, is key to the production of an ordered porous material. The reaction scheme was proposed to be based on the interaction of calcium carbonate with the siloxane bond. FTIR, XRD, GPC, and TGA were used to study the composition and structure of the obtained materials. The cross-sectional area of the polymer chain and the volumes of the coherent scattering regions of the polymers obtained were calculated from the XRD data. To prepare the composites, the sea urchin skeleton was further modified with polycalciumorganyl silsesquioxanes in a toluene solution. To remove the sea urchin skeleton, the obtained biomimetic composites were treated with hydrochloric acid. The results of the morphological and surface composition studies are reported. The method proposed in the paper could be of fundamental importance for the possibility of obtaining structured porous composite materials for a wide range of practical applications, including for the purpose of creating a composite that may be a promising carrier for targeted delivery of chemotherapy agents.
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Affiliation(s)
- Nikolay P. Shapkin
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
| | - Irina G. Khalchenko
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
| | - Anatoliy L. Drozdov
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch of the Russian Academy of Sciences, St. 17 Palchevsky, 690041 Vladivostok, Russia;
| | - Aleksander N. Fedorets
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
| | - Igor Yu Buravlev
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
| | - Anna A. Andrasyuk
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
| | - Natalya V. Maslova
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
| | - Kirill A. Pervakov
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
| | - Evgeniy K. Papynov
- Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, Russia; (N.P.S.); (I.G.K.); (A.N.F.); (A.A.A.); (N.V.M.); (K.A.P.); (E.K.P.)
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Deng Z, Chen L, Li L. Comparative nanoindentation study of biogenic and geological calcite. J Mech Behav Biomed Mater 2023; 137:105538. [PMID: 36343519 DOI: 10.1016/j.jmbbm.2022.105538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 10/17/2022] [Accepted: 10/19/2022] [Indexed: 11/06/2022]
Abstract
Biogenic minerals are often reported to be harder and tougher than their geological counterparts. However, quantitative comparison of their mechanical properties, particularly fracture toughness, is still limited. Here we provide a systematic comparison of geological and biogenic calcite (mollusk shell Atrina rigida prisms and Placuna placenta laths) through nanoindentation under both dry and 90% relative humidity conditions. Berkovich nanoindentation is used to reveal the mechanical anisotropy of geological calcite when loaded on different crystallographic planes, i.e., reduced modulus Er{104} ≥ Er{108} > Er{001} and hardness H{001} ≥ H{104} ≥ H{108}, and biogenic calcite has comparable modulus but increased hardness than geological calcite. Based on conical nanoindentation, we elucidate that plastic deformation is activated in geological calcite at the low-load regime (<20 mN), involving r{104} and f{012} dislocation slips as well as e{018} twinning, while cleavage fracture dominates under higher loads by cracking along {104} planes. In comparison, biogenic calcite tends to undergo fracture, while the intercrystalline organic interfaces contribute to damage confinement. In addition, increased humidity does not show a significant influence on the properties of geological calcite and the single-crystal A. rigida prisms, however, the laminate composite of P. placenta laths (layer thickness, ∼250-300 nm) exhibits increased toughness and decreased hardness and modulus. We believe the results of this study can provide a benchmark for future investigations on biominerals and bio-inspired materials.
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Affiliation(s)
- Zhifei Deng
- Department of Mechanical Engineering, Virginia Polytechnic Institute of Technology and State University, Blacksburg, VA, 24060, USA
| | - Liuni Chen
- Department of Mechanical Engineering, Virginia Polytechnic Institute of Technology and State University, Blacksburg, VA, 24060, USA
| | - Ling Li
- Department of Mechanical Engineering, Virginia Polytechnic Institute of Technology and State University, Blacksburg, VA, 24060, USA.
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High strength and damage-tolerance in echinoderm stereom as a natural bicontinuous ceramic cellular solid. Nat Commun 2022; 13:6083. [PMID: 36241635 PMCID: PMC9568512 DOI: 10.1038/s41467-022-33712-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 09/26/2022] [Indexed: 12/24/2022] Open
Abstract
Due to their low damage tolerance, engineering ceramic foams are often limited to non-structural usages. In this work, we report that stereom, a bioceramic cellular solid (relative density, 0.2-0.4) commonly found in the mineralized skeletal elements of echinoderms (e.g., sea urchin spines), achieves simultaneous high relative strength which approaches the Suquet bound and remarkable energy absorption capability (ca. 17.7 kJ kg-1) through its unique bicontinuous open-cell foam-like microstructure. The high strength is due to the ultra-low stress concentrations within the stereom during loading, resulted from their defect-free cellular morphologies with near-constant surface mean curvatures and negative Gaussian curvatures. Furthermore, the combination of bending-induced microfracture of branches and subsequent local jamming of fractured fragments facilitated by small throat openings in stereom leads to the progressive formation and growth of damage bands with significant microscopic densification of fragments, and consequently, contributes to stereom's exceptionally high damage tolerance.
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Perricone V, Grun TB, Rendina F, Marmo F, Candia Carnevali MD, Kowalewski M, Facchini A, De Stefano M, Santella L, Langella C, Micheletti A. Hexagonal Voronoi pattern detected in the microstructural design of the echinoid skeleton. JOURNAL OF THE ROYAL SOCIETY, INTERFACE 2022; 19:20220226. [PMID: 35946165 PMCID: PMC9363984 DOI: 10.1098/rsif.2022.0226] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Repeated polygonal patterns are pervasive in natural forms and structures. These patterns provide inherent structural stability while optimizing strength-per-weight and minimizing construction costs. In echinoids (sea urchins), a visible regularity can be found in the endoskeleton, consisting of a lightweight and resistant micro-trabecular meshwork (stereom). This foam-like structure follows an intrinsic geometrical pattern that has never been investigated. This study aims to analyse and describe it by focusing on the boss of tubercles—spine attachment sites subject to strong mechanical stresses—in the common sea urchin Paracentrotus lividus. The boss microstructure was identified as a Voronoi construction characterized by 82% concordance to the computed Voronoi models, a prevalence of hexagonal polygons, and a regularly organized seed distribution. This pattern is interpreted as an evolutionary solution for the construction of the echinoid skeleton using a lightweight microstructural design that optimizes the trabecular arrangement, maximizes the structural strength and minimizes the metabolic costs of secreting calcitic stereom. Hence, this identification is particularly valuable to improve the understanding of the mechanical function of the stereom as well as to effectively model and reconstruct similar structures in view of future applications in biomimetic technologies and designs.
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Affiliation(s)
- Valentina Perricone
- Department of Engineering, University of Campania Luigi Vanvitelli, Via Roma 29, Aversa 81031, Italy
| | - Tobias B Grun
- Division of Invertebrate Paleontology, Florida Museum of Natural History, University of Florida, Gainesville, FL 32618, USA
| | - Francesco Rendina
- Department of Science and Technology, University of Naples 'Parthenope', URL CoNISMa, Centro Direzionale Is.4, Naples 80143, Italy
| | - Francesco Marmo
- Department of Structures for Engineering and Architecture, University of Naples Federico II, Via Claudio 21, Naples 80125, Italy
| | | | - Michal Kowalewski
- Division of Invertebrate Paleontology, Florida Museum of Natural History, University of Florida, Gainesville, FL 32618, USA
| | - Angelo Facchini
- IMT school for advanced studies Lucca, Piazza S. Ponziano 6, 55100, Lucca, Italy
| | - Mario De Stefano
- Department of Environmental, Biological and Pharmaceutical Science and Technology University of Campania 'L. Vanvitelli', Via Vivaldi 43, Caserta 80127, Italy
| | - Luigia Santella
- Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples 80121, Italy
| | - Carla Langella
- Department of Architecture and Industrial Design, University of Campania Luigi Vanvitelli, Via San Lorenzo, 81031, Aversa, Italy
| | - Alessandra Micheletti
- Department of Environmental Science and Policy, University of Milano, Via Celoria 26, Milan 20133, Italy
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Understanding the crystallographic and nanomechanical properties of bryozoans. J Struct Biol 2022; 214:107882. [PMID: 35850322 DOI: 10.1016/j.jsb.2022.107882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 07/08/2022] [Accepted: 07/12/2022] [Indexed: 11/23/2022]
Abstract
This study examines how microscale differences in skeletal ultrastructure affect the crystallographic and nanomechanical properties of two related bryozoan species: (i) Hornera currieae, which is found at relatively quiescent depths of c. 1000 m, and (ii) Hornera robusta, which lives at depths of 50-400 m where it is exposed to currents and storm waves. Microstructural and Electron Backscatter Diffraction (EBSD) observations show that in both species the secondary walls are composed of low-Mg calcite crystallites that grow with their c-axes perpendicular to the wall. Branches in H. currieae develop a strong preferred orientation of the calcite c-axes, while in H. robusta the c-axes are more scattered. Microstructural observations suggest that the degree of scattering is controlled by the underlying morphology of the skeletons: in H. currieae the laminated branch walls are smooth and relatively uninterrupted, whereas the wall architecture of H. robusta is modified by numerous deflections, forming pustules and ridges associated with microscopic tubules. Modelling of the Young's modulus and measurements of nanoindentation hardness indicate that the observed scattering of the crystallite c-axes affects the elastic modulus and nanohardness of the branches, and therefore controls the mechanical properties of the skeletal walls. At relatively high pressure in deep waters, the anisotropic skeletal architecture of H. currieae is aimed at concentrating elasticity normal to the skeleton wall. In comparison, in the relatively shallow and active hydrographic regime of the continental shelf, the elastically isotropic skeleton of H. robusta is designed to increase protection from external predators and stronger omni-directional currents.
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Deng Z, Jia Z, Li L. Biomineralized Materials as Model Systems for Structural Composites: Intracrystalline Structural Features and Their Strengthening and Toughening Mechanisms. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103524. [PMID: 35315243 PMCID: PMC9108615 DOI: 10.1002/advs.202103524] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 01/09/2022] [Indexed: 05/02/2023]
Abstract
Biomineralized composites, which are usually composed of microscopic mineral building blocks organized in 3D intercrystalline organic matrices, have evolved unique structural designs to fulfill mechanical and other biological functionalities. While it has been well recognized that the intricate architectural designs of biomineralized composites contribute to their remarkable mechanical performance, the structural features within and corresponding mechanical properties of individual mineral building blocks are often less appreciated in the context of bio-inspired structural composites. The mineral building blocks in biomineralized composites exhibit a variety of salient intracrystalline structural features, such as, organic inclusions, inorganic impurities (or trace elements), crystalline features (e.g., amorphous phases, single crystals, splitting crystals, polycrystals, and nanograins), residual stress/strain, and twinning, which significantly modify the mechanical properties of biogenic minerals. In this review, recent progress in elucidating the intracrystalline structural features of three most common biomineral systems (calcite, aragonite, and hydroxyapatite) and their corresponding mechanical significance are discussed. Future research directions and corresponding challenges are proposed and discussed, such as the advanced structural characterizations and formation mechanisms of intracrystalline structures in biominerals, amorphous biominerals, and bio-inspired synthesis.
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Affiliation(s)
- Zhifei Deng
- Department of Mechanical EngineeringVirginia Polytechnic Institute of Technology and State UniversityBlacksburgVA24060USA
| | - Zian Jia
- Department of Mechanical EngineeringVirginia Polytechnic Institute of Technology and State UniversityBlacksburgVA24060USA
| | - Ling Li
- Department of Mechanical EngineeringVirginia Polytechnic Institute of Technology and State UniversityBlacksburgVA24060USA
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High-Mg calcite nanoparticles within a low-Mg calcite matrix: A widespread phenomenon in biomineralization. Proc Natl Acad Sci U S A 2022; 119:e2120177119. [PMID: 35412906 PMCID: PMC9169743 DOI: 10.1073/pnas.2120177119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Biominerals are extraordinarily intricate and possess superior mechanical properties compared with their synthetic counterparts. In this study, we show that the presence of high-Mg calcite nanoparticles within a low-Mg calcite matrix is a widespread phenomenon among marine organisms whose skeletons are composed of high-Mg calcite. It seems most likely that formation of such a complex structure is possible because of the phase separation that occurs as a result of spinodal decomposition of an amorphous Mg–calcium carbonate precursor and is followed by crystallization. We demonstrate that the basis of such phase separation stems from chemical composition rather than from biological similarities. The presence of high-Mg calcite nanoparticles increases the skeletons’ toughness and hardness. During the process of biomineralization, organisms utilize various biostrategies to enhance the mechanical durability of their skeletons. In this work, we establish that the presence of high-Mg nanoparticles embedded within lower-Mg calcite matrices is a widespread strategy utilized by various organisms from different kingdoms and phyla to improve the mechanical properties of their high-Mg calcite skeletons. We show that such phase separation and the formation of high-Mg nanoparticles are most probably achieved through spinodal decomposition of an amorphous Mg-calcite precursor. Such decomposition is independent of the biological characteristics of the studied organisms belonging to different phyla and even kingdoms but rather, originates from their similar chemical composition and a specific Mg content within their skeletons, which generally ranges from 14 to 48 mol % of Mg. We show evidence of high-Mg calcite nanoparticles in the cases of six biologically different organisms all demonstrating more than 14 mol % Mg-calcite and consider it likely that this phenomenon is immeasurably more prevalent in nature. We also establish the absence of these high-Mg nanoparticles in organisms whose Mg content is lower than 14 mol %, providing further evidence that whether or not spinodal decomposition of an amorphous Mg-calcite precursor takes place is determined by the amount of Mg it contains. The valuable knowledge gained from this biostrategy significantly impacts the understanding of how biominerals, although composed of intrinsically brittle materials, can effectively resist fracture. Moreover, our theoretical calculations clearly suggest that formation of Mg-rich nanoprecipitates greatly enhances the hardness of the biomineralized tissue as well.
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Voulgaris K, Varkoulis A, Zaoutsos S, Stratakis A, Vafidis D. Mechanical defensive adaptations of three Mediterranean sea urchin species. Ecol Evol 2021; 11:17734-17743. [PMID: 35003635 PMCID: PMC8717311 DOI: 10.1002/ece3.8247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 11/29/2022] Open
Abstract
In the Mediterranean, Paracentrotus lividus and Sphaerechinus granularis are important drivers of benthic ecosystems, often coexisting in sublittoral communities. However, the introduction of the invasive diadematoid Diadema setosum, which utilizes venomous spines, may affect these communities. To describe the mechanical properties of the test and spines of these three species, specimens were collected in winter of 2019 from the sublittoral zone of the Dodecanese island complex, southeastern Aegean Sea. This region serves as a gateway for invasive species to the Mediterranean Sea. Crushing test was conducted on live individuals, while 3-point bending test was used to estimate spine stiffness. Porosity and mineralogy of the test and spine, thickness of the test, and breaking length of the spine were measured and compared, while the microstructural architecture was also determined. The test of S. granularis was the most robust (194.35 ± 59.59 N), while the spines of D. setosum (4.76 ± 2.13 GPa) exhibited highest flexibility. Increased porosity and thickness of the test were related to increased robustness, whereas increased flexibility of the spine was attributed to high porosity, indicating that porosity in the skeleton plays a key role in preventing fracture. The spines of S. granularis exhibited highest length after fracture % (71.54 ± 5.5%). D. setosum exhibited higher values of Mg concentration in the test (10%) compared with the spines (4%). For the first time, the mineralogy of an invasive species is compared with its native counterpart, while a comparison of the mechanical properties of different species of the same ecosystem also takes place. This study highlights different ways, in which sea urchins utilize their skeleton and showcases the ecological significance of these adaptations, one of which is the different ways of utilization of the skeleton for defensive purposes, while the other is the ability of D. setosum to decrease the Mg % of its skeleton degrading its mechanical properties, without compromising its defense, by depending on venomous bearing spines. This enables this species to occupy not only tropical habitats, where it is indigenous, but also temperate like the eastern Mediterranean, which it has recently invaded.
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Affiliation(s)
- Konstantinos Voulgaris
- Department of Ichthyology and Aquatic EnvironmentNea Ionia, University of ThessalyVolosGreece
| | - Anastasios Varkoulis
- Department of Ichthyology and Aquatic EnvironmentNea Ionia, University of ThessalyVolosGreece
| | | | - Antonios Stratakis
- School of Mineral Resources EngineeringCrete Technical University of CreteChaniaGreece
| | - Dimitris Vafidis
- Department of Ichthyology and Aquatic EnvironmentNea Ionia, University of ThessalyVolosGreece
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Bianco-Stein N, Polishchuk I, Lang A, Atiya G, Villanova J, Zaslansky P, Katsman A, Pokroy B. Structural and chemical variations in Mg-calcite skeletal segments of coralline red algae lead to improved crack resistance. Acta Biomater 2021; 130:362-373. [PMID: 34087436 DOI: 10.1016/j.actbio.2021.05.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 05/20/2021] [Accepted: 05/21/2021] [Indexed: 11/24/2022]
Abstract
The calcareous alga Jania sp. is an articulated coralline red seaweed that is abundant in the shallow waters of oceans worldwide. We have previously demonstrated that its structure is highly intricate and exhibits hierarchical organization across multiple length scales from the macro to the nano scale. Moreover, we have proven that the inner pores of its structure are helical, conveying the alga greater compliance as compared to a cylindrical configuration. Herein, we reveal new insights into the structure of Jania sp., particularly, its crystallographic variations and the internal elemental distribution of Mg and Ca. We show that the high-Mg calcite cell wall nanocrystals of Jania sp. are arranged in layers with alternating Mg contents. Moreover, we show that this non-homogenous elemental distribution assists the alga in preventing fracture caused by crack propagation. We further reveal that each one of the cell wall nanocrystals in Jania sp. is not a single crystal as was previously thought, but rather comprises Mg-rich calcite nanoparticles demonstrating various crystallographic orientations, arranged periodically within the layered structure. We also show that these Mg-rich nanoparticles are present in yet another species of the coralline red algae, Corallina sp., pointing to the generality of this phenomenon. To the best of our knowledge this is a first report on the existence of Mg-rich nanoparticles in algal mineralized tissue. We envisage that our findings on the bio-strategy found in the algae to enhance their fracture toughness will have an impact on the design of structures with superior mechanical properties. STATEMENT OF SIGNIFICANCE: Understanding the structure-property relation in biomineralized tissues is of great importance in unveiling Nature's material design strategies, which form the basis for the development of novel structural materials. Crystallographic and elemental variations in the skeletal parts of the coralline red algae and their cumulative contribution to prevention of mechanical failure are yet poorly studied. Herein, we reveal that the high-Mg calcite cell wall nanocrystals of Jania sp. are arranged in layers with alternating Mg concentrations and that this organization facilitates crack deflection, thereby preventing catastrophic fracture. We further discovered that the nanocrystals contain incoherent Mg-rich nanoparticles and suggest that they form via spinodal decomposition of the Mg-ACC precursor and self-arrange periodically throughout the alga's mineralized cell wall, a phenomenon most likely to be widespread in high-Mg calcite biomineralization.
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Coccolith crystals: Pure calcite or organic-mineral composite structures? Acta Biomater 2021; 125:83-89. [PMID: 33631395 DOI: 10.1016/j.actbio.2021.02.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 11/20/2022]
Abstract
The localization of organic material within biominerals is central to developing biomineral formation mechanisms. Coccoliths, morphologically sophisticated calcite platelets of intracellularly calcifying coccolithophores, are not only eco-physiologically important, but also influence biogeochemical cycles through mass production. Despite their importance and over a century of research, the formation mechanism of coccoliths is still poorly understood. Crucial unsolved questions include the localization of organic material within coccoliths. In extracellular calcifiers the discovery of an organics-containing nano-structure within seemingly single crystals has led to the formulation of a two-step crystallization mechanism. Coccoliths are traditionally thought of as being formed by a different mechanism, but it is unclear whether coccolith crystals possess a nano-structure. Here we review the evidence for and against such a nano-structure. Current SXPD analyses suggest a nano-structure of some kind, while imaging methods (SEM, TEM, AFM) provide evidence against it. We suggest directions for future research which should help solve this puzzle. STATEMENT OF SIGNIFICANCE: Coccolithophores, unicellular calcifying algae, are important primary producers and contribute significantly to pelagic calcium carbonate export. Their calcite platelets, the coccoliths, are amongst the most sophisticated biomineral structures. Understanding the crystallization mechanism of coccolith crystals is not only central to coccolithophore cell biology but also lies at the heart of biomineralization research more generally. The crystallization mechanism of coccoliths has remained largely elusive, not least because it is still an open question whether the micron sized coccolith crystals are pure calcite, or contain organic material. Here we review the state of the art and suggest a way to solve this central problem.
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Asnaghi V, Chindris A, Leggieri F, Scolamacchia M, Brundu G, Guala I, Loi B, Chiantore M, Farina S. Decreased pH impairs sea urchin resistance to predatory fish: A combined laboratory-field study to understand the fate of top-down processes in future oceans. MARINE ENVIRONMENTAL RESEARCH 2020; 162:105194. [PMID: 33126114 DOI: 10.1016/j.marenvres.2020.105194] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 10/07/2020] [Accepted: 10/11/2020] [Indexed: 06/11/2023]
Abstract
Changing oceans represent a serious threat for a wide range of marine organisms, with severe cascading effects on ecosystems and their services. Sea urchins are particularly sensitive to decreased pH expected for the end of the century and their key ecological role in regulating community structure and functioning could be seriously compromised. An integrated approach of laboratory and field experiments has been implemented to investigate the effects of decreased pH on predator-prey interaction involving sea urchins and their predators. Our results suggest that under future Ocean Acidification scenarios adult sea urchins defence strategies, such as spine length, test robustness and oral plate thickness, could be compromised together with their survival chance to natural predators. Sea urchins represent the critical linkage between top-down and bottom-up processes along Mediterranean rocky reefs, and the cumulative impacts of global and local stressors could lead to a decline producing cascading effects on benthic ecosystems.
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Affiliation(s)
- V Asnaghi
- DISTAV, University of Genoa, C.so Europa 26, 16132, Genoa, Italy.
| | - A Chindris
- IMC - International Marine Centre, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy
| | - F Leggieri
- IMC - International Marine Centre, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy; CNR - National Research Council, IAS - Institute of Anthropic Impacts and Sustainability in Marine Environment, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy
| | - M Scolamacchia
- IMC - International Marine Centre, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy; CNR - National Research Council, IAS - Institute of Anthropic Impacts and Sustainability in Marine Environment, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy
| | - G Brundu
- IMC - International Marine Centre, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy
| | - I Guala
- IMC - International Marine Centre, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy
| | - B Loi
- IMC - International Marine Centre, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy
| | - M Chiantore
- DISTAV, University of Genoa, C.so Europa 26, 16132, Genoa, Italy
| | - S Farina
- IMC - International Marine Centre, Loc. Sa Mardini, Torre Grande, 09170, Oristano, Italy
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14
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Perricone V, Grun TB, Marmo F, Langella C, Candia Carnevali MD. Constructional design of echinoid endoskeleton: main structural components and their potential for biomimetic applications. BIOINSPIRATION & BIOMIMETICS 2020; 16:011001. [PMID: 32927446 DOI: 10.1088/1748-3190/abb86b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 09/14/2020] [Indexed: 06/11/2023]
Abstract
The endoskeleton of echinoderms (Deuterostomia: Echinodermata) is of mesodermal origin and consists of cells, organic components, as well as an inorganic mineral matrix. The echinoderm skeleton forms a complex lattice-system, which represents a model structure for naturally inspired engineering in terms of construction, mechanical behaviour and functional design. The sea urchin (Echinodermata: Echinoidea) endoskeleton consists of three main structural components: test, dental apparatus and accessory appendages. Although, all parts of the echinoid skeleton consist of the same basic material, their microstructure displays a great potential in meeting several mechanical needs according to a direct and clear structure-function relationship. This versatility has allowed the echinoid skeleton to adapt to different activities such as structural support, defence, feeding, burrowing and cleaning. Although, constrained by energy and resource efficiency, many of the structures found in the echinoid skeleton are optimized in terms of functional performances. Therefore, these structures can be used as role models for bio-inspired solutions in various industrial sectors such as building constructions, robotics, biomedical and material engineering. The present review provides an overview of previous mechanical and biomimetic research on the echinoid endoskeleton, describing the current state of knowledge and providing a reference for future studies.
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Affiliation(s)
- Valentina Perricone
- Dept. of Engineering, University of Campania Luigi Vanvitelli, Aversa, Italy
| | - Tobias B Grun
- Dept. of Invertebrate Paleontology, University of Florida, Florida Museum, Gainesville, Florida, United States of America
| | - Francesco Marmo
- Dept. of Structures for Engineering and Architecture, University of Naples Federico II, Napoli, Italy
| | - Carla Langella
- Dept. of Architecture and Industrial Design, University of Campania Luigi Vanvitelli, Aversa, Italy
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15
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Righi S, Savioli M, Prevedelli D, Simonini R, Malferrari D. Unravelling the ultrastructure and mineralogical composition of fireworm stinging bristles. ZOOLOGY 2020; 144:125851. [PMID: 33227649 DOI: 10.1016/j.zool.2020.125851] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 09/30/2020] [Accepted: 10/02/2020] [Indexed: 10/23/2022]
Abstract
Amphinomid fireworms are notorious for their stinging dorsal bristles (notochaetae), but it is still unclear whether the irritation they cause is merely mechanical or if the notochaetae contain toxins. Furthermore, although fireworm chaetae have always been described as calcareous, their composition has never been investigated to date and strong debates are ongoing on their internal structure. Unravelling the native ultrastructure and composition of fireworm chaetae is the first crucial step to assess whether the hypothesis of toxin vehiculation could be fully considered. We examined for the first time the chemical and mineralogical composition, the ultrastructure and the external structure of the dorsal and ventral chaetae of the large species Hermodice carunculata. All the measurements were carried out on samples prepared without the use of chemical reagents, except for those targeted to investigate if decalcification altered the ultrastructure of the chaetae. A crystal-chemical strategy, combining chemical, diffraction and thermal analyses clearly showed the occurrence of crystalline calcium carbonate and clusters of phosphatic amorphous material. Scanning electron micrographs and energy dispersive X-ray measurements showed that the dorsal chaetae have an extremely shallow insertion point in the body respect to the ventral chaetae, that could facilitate the release of the notochaetae in the environment. Their proximal part is characterized by canals with a hexagonal pattern rich in Ca and P, followed by a large cavity upwards. The harpoon-shaped ends and the central canals of the notochaetae completely disappeared after exposure to EDTA. The notochaetae are hollow and may be able to vehicle toxins. The absence of the honeycomb pattern in the distal part of the notochaetae and their slenderness probably contribute to their brittleness and high sensitivity to breakage on contact. These observations constitute keystone understandings to shed light on fireworm defensive and offensive capacities and their ecological success.
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Affiliation(s)
- Sara Righi
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 213/D, 41125 Modena, Italy; Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125 Modena, Italy.
| | - Martina Savioli
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125 Modena, Italy.
| | - Daniela Prevedelli
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 213/D, 41125 Modena, Italy.
| | - Roberto Simonini
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 213/D, 41125 Modena, Italy.
| | - Daniele Malferrari
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125 Modena, Italy.
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16
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Deng Z, Chen H, Yang T, Jia Z, Weaver JC, Shevchenko PD, De Carlo F, Mirzaeifar R, Li L. Strategies for simultaneous strengthening and toughening via nanoscopic intracrystalline defects in a biogenic ceramic. Nat Commun 2020; 11:5678. [PMID: 33173053 PMCID: PMC7655841 DOI: 10.1038/s41467-020-19416-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 10/07/2020] [Indexed: 12/15/2022] Open
Abstract
While many organisms synthesize robust skeletal composites consisting of spatially discrete organic and mineral (ceramic) phases, the intrinsic mechanical properties of the mineral phases are poorly understood. Using the shell of the marine bivalve Atrina rigida as a model system, and through a combination of multiscale structural and mechanical characterization in conjunction with theoretical and computational modeling, we uncover the underlying mechanical roles of a ubiquitous structural motif in biogenic calcite, their nanoscopic intracrystalline defects. These nanoscopic defects not only suppress the soft yielding of pure calcite through the classical precipitation strengthening mechanism, but also enhance energy dissipation through controlled nano- and micro-fracture, where the defects' size, geometry, orientation, and distribution facilitate and guide crack initialization and propagation. These nano- and micro-scale cracks are further confined by larger scale intercrystalline organic interfaces, enabling further improved damage tolerance.
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Affiliation(s)
- Zhifei Deng
- Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA
| | - Hongshun Chen
- Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA
| | - Ting Yang
- Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA
| | - Zian Jia
- Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA
| | - James C Weaver
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 60 Oxford Street, Cambridge, MA, 02138, USA
| | - Pavel D Shevchenko
- Advanced Photon Source, Argonne National Laboratory, 9700S Cass Ave, Lemont, IL, 60439, USA
| | - Francesco De Carlo
- Advanced Photon Source, Argonne National Laboratory, 9700S Cass Ave, Lemont, IL, 60439, USA
| | - Reza Mirzaeifar
- Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA
| | - Ling Li
- Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, VA, 24061, USA.
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Kołbuk D, Di Giglio S, M'Zoudi S, Dubois P, Stolarski J, Gorzelak P. Effects of seawater Mg 2+ /Ca 2+ ratio and diet on the biomineralization and growth of sea urchins and the relevance of fossil echinoderms to paleoenvironmental reconstructions. GEOBIOLOGY 2020; 18:710-724. [PMID: 32772500 DOI: 10.1111/gbi.12409] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 07/17/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
It has been argued that skeletal Mg/Ca ratio in echinoderms is mostly governed by Mg2+ and Ca2+ concentrations in the ambient seawater. Accordingly, well-preserved fossil echinoderms were used to reconstruct Phanerozoic seawater Mg2+ /Ca2+ ratio. However, Mg/Ca ratio in echinoderm skeleton can be affected by a number of environmental and physiological factors, the effects of which are still poorly understood. Notably, experimental data supporting the applicability of echinoderms in paleoenvironmental reconstructions remain limited. Here, we investigated the effect of ambient Mg2+ /Ca2+ seawater ratio and diet on skeletal Mg/Ca ratio and growth rate in two echinoid species (Psammechinus miliaris and Prionocidaris baculosa). Sea urchins were tagged with manganese and then cultured in different Mg2+ /Ca2+ conditions to simulate fluctuations in the Mg2+ /Ca2+ seawater ratios in the Phanerozoic. Simultaneously, they were fed on a diet containing different amounts of magnesium. Our results show that the skeletal Mg/Ca ratio in both species varied not only between ossicle types but also between different types of stereom within a single ossicle. Importantly, the skeletal Mg/Ca ratio in both species decreased proportionally with decreasing seawater Mg2+ /Ca2+ ratio. However, sea urchins feeding on Mg-enriched diet produced a skeleton with a higher Mg/Ca ratio. We also found that although incubation in lower ambient Mg2+ /Ca2+ ratio did not affect echinoid respiration rates, it led to a decrease or inhibition of their growth. Overall, these results demonstrate that although skeletal Mg/Ca ratios in echinoderms can be largely determined by seawater chemistry, the type of diet may also influence skeletal geochemistry, which imposes constraints on the application of fossil echinoderms as a reliable proxy. The accuracy of paleoseawater Mg2+ /Ca2+ calculations is further limited by the fact that Mg partition coefficients vary significantly at different scales (between species, specimens feeding on different types of food, different ossicle types, and stereom types within a single ossicle).
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Affiliation(s)
- Dorota Kołbuk
- Institute of Paleobiology, Polish Academy of Sciences, Warsaw, Poland
| | - Sarah Di Giglio
- Laboratoire de Biologie Marine, Faculté des Sciences, Université Libre de Bruxelles, Bruxelles, Belgium
| | - Saloua M'Zoudi
- Laboratoire de Biologie Marine, Faculté des Sciences, Université Libre de Bruxelles, Bruxelles, Belgium
| | - Philippe Dubois
- Laboratoire de Biologie Marine, Faculté des Sciences, Université Libre de Bruxelles, Bruxelles, Belgium
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18
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Chemical Composition and Microstructural Morphology of Spines and Tests of Three Common Sea Urchins Species of the Sublittoral Zone of the Mediterranean Sea. Animals (Basel) 2020; 10:ani10081351. [PMID: 32759777 PMCID: PMC7460165 DOI: 10.3390/ani10081351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/31/2020] [Accepted: 08/02/2020] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Arbacia lixula, Paracentrotus lividus and Sphaerechinus granularis play a key role in many sublittoral biocommunities of the Mediterranean Sea. However, their skeletons seem to differ, both morphologically and in chemical composition. Thus, the skeletal elements display different properties, which are affected not only by the environment, but also by the vital effect of each species. We studied the microstructural morphology and crystalline phase of the test and spines, while also examining the effect of time on their elemental composition. Results showed morphologic differences among the three species both in spines and tests. They also seem to respond differently to possible time-related changes. The mineralogical composition of P. lividus appears to be quite different compare to the other two species. The results of the present study may contribute to a better understanding of the skeletal properties of these species, this being especially useful in predicting the effects of ocean acidification. More specifically, since the skeleton plays a key role for the survival of sea urchins in general, a potential change in any skeletal structure, either morphologically or chemically, may affect these organisms directly while also affecting their ecosystem indirectly. Abstract In the Mediterranean Sea, the species Arbacia lixula, Paracentrotus lividus and Sphaerechinus granularis often coexist, occupying different subareas of the same habitat. The mechanical and chemical properties of their calcitic skeletons are affected both by their microstructural morphology and chemical composition. The present study describes the main morphologic features and the possible temporal differences in elemental composition of the test and spines of the three species, while also determining the molar ratio of each element of their crystalline phase. Scanning electron microscopy showed major differences in the ultrastructure of the spines, while minor differences in the test were also noticed. More specifically, the spines of all three sea urchins possess wedges, however A. lixula exhibits bridges connecting each wedge, while barbs are observed in the wedges of S. granularis. The spines of P. lividus are devoid of both microstructures. Secondary tubercles are absent in the test of A. lixula, while the tests and spines of all three species are characterized by different superficial stereom. Energy dispersive x-ray spectroscopy detected that Ca, Mg, S, Na and Cl were present in all specimen. Mg and Mg/Ca showed significant differences between species both in test and spines with S. granularis having the highest concentration. The spines of P. lividus exhibited lowest values between all species. Differences between spines and test were observed in all elements for P. lividus except S. A. lixula exhibited different concentrations between test and spines for Ca, Mg and Mg/Ca, whereas S. granularis for Mg, Cl and Mg/Ca. Finally, temporal differences for Ca were observed in the test of P. lividus and the spines of S. granularis, for Mg in test of S. granularis, for S in the spines of A. lixula and the test and spine of S. granularis, for Na in the test of P. lividus and A. lixula and for Cl and Mg/Ca in the test P. lividus. Powder X-ray diffractometry determined that, out of all three species, the spines of P. lividus contained the least Mg, while the test of the same species exhibited higher Mg concentration compared to A. lixula and S. granularis. The current study, although not labeling the specimens attempts to estimate potential time-related elemental differences among other results. These may occur due to changes in abiotic factors, probably water temperature, salinity and/or pH. Divergence in food preference and food availability may also play a key role in possible temporal differences the skeletons of these species
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Bianco‐Stein N, Polishchuk I, Seiden G, Villanova J, Rack A, Zaslansky P, Pokroy B. Helical Microstructures of the Mineralized Coralline Red Algae Determine Their Mechanical Properties. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:2000108. [PMID: 32537417 PMCID: PMC7284203 DOI: 10.1002/advs.202000108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 03/01/2020] [Accepted: 03/04/2020] [Indexed: 05/07/2023]
Abstract
Through controlled biomineralization, organisms yield complicated structures with specific functions. Here, Jania sp., an articulated coralline red alga that secretes high-Mg calcite as part of its skeleton, is in focus. It is shown that Jania sp. exhibits a remarkable structure, which is highly porous (with porosity as high as 64 vol%) and reveals several hierarchical orders from the nano to the macroscale. It is shown that the structure is helical, and proven that its helical configuration provides the alga with superior compliance that allows it to adapt to stresses in its natural environment. Thus, the combination of high porosity and a helical configuration result in a sophisticated, light-weight, compliant structure. It is anticipated that the findings on the advantages of such a structure are likely to be of value in the design or improvement of lightweight structures with superior mechanical properties.
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Affiliation(s)
- Nuphar Bianco‐Stein
- Department of Materials Science and Engineering and the Russell Berrie Nanotechnology InstituteTechnion−Israel Institute of TechnologyHaifa32000Israel
| | - Iryna Polishchuk
- Department of Materials Science and Engineering and the Russell Berrie Nanotechnology InstituteTechnion−Israel Institute of TechnologyHaifa32000Israel
| | - Gabriel Seiden
- Moriah Scientific ConsultingYehiel Paldi St 11Rehovot7624811Israel
| | | | - Alexander Rack
- The European SynchrotronCS 40220Grenoble Cedex 938043France
| | - Paul Zaslansky
- Department of Restorative and Preventive DentistryInstitute for Dental and Craniofacial SciencesCharité–Universitätsmedizin BerlinBerlin14197Germany
| | - Boaz Pokroy
- Department of Materials Science and Engineering and the Russell Berrie Nanotechnology InstituteTechnion−Israel Institute of TechnologyHaifa32000Israel
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20
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Yang T, Wu Z, Chen H, Zhu Y, Li L. Quantitative 3D structural analysis of the cellular microstructure of sea urchin spines (I): Methodology. Acta Biomater 2020; 107:204-217. [PMID: 32109599 DOI: 10.1016/j.actbio.2020.02.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 02/19/2020] [Accepted: 02/21/2020] [Indexed: 11/29/2022]
Abstract
The mineralized skeletons of echinoderms are characterized by their complex, open-cell porous microstructure (also known as stereom), which exhibits vast variations in pore sizes, branch morphology, and three-dimensional (3D) organization patterns among different species. Quantitative description and analysis of these cellular structures in 3D are needed in order to understand their mechanical properties and underlying design strategies. In this paper series, we present a framework for analyzing such structures based on high-resolution 3D tomography data and utilize this framework to investigate the structural designs of stereom by using the spines from the sea urchin Heterocentrotus mamillatus as a model system. The first paper here reports the proposed cellular network analysis framework, which consists of five major steps: synchrotron-based tomography and hierarchical convolutional neural network-based reconstruction, machine learning-based segmentation, cellular network registration, feature extraction, and data representation and analysis. This framework enables the characterization of the porous stereom structures at the individual node and branch level (~10 µm), the local cellular level (~100 µm), and the global network level (~1 mm). We define and quantify multiple structural descriptors at each level, such as node connectivity, branch length and orientation, branch profile, ring structure, etc., which allows us to investigate the cellular network construction of H. mamillatus spines quantitatively. The methodology reported here could be tailored to analyze other natural or engineering open-cell porous materials for a comprehensive multiscale network representation and mechanical analysis. STATEMENT OF SIGNIFICANCE: The mechanical robustness of the biomineralized porous structures in sea urchin spines has long been recognized. However, quantitative cellular network representation and analysis of this class of natural cellular solids are still limited in the literature. This constrains our capability to fully understand the mechanical properties and design strategies in sea urchin spines and other similar echinoderms' porous skeletal structures. Combining high-resolution tomography and computer vision-based analysis, this work presents a multiscale 3D network analysis framework, which allows for extraction, registration, and quantification of sea urchin spines' complex porous structure from the individual branch and node level to the global network level. This 3D structural analysis is relevant to a diversity of research fields, such as biomineralization, skeletal biology, biomimetics, material science, etc.
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Affiliation(s)
- Ting Yang
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24060, USA
| | - Ziling Wu
- Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24060, USA
| | - Hongshun Chen
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24060, USA
| | - Yunhui Zhu
- Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24060, USA.
| | - Ling Li
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24060, USA.
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21
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Magnabosco G, Papiano I, Aizenberg M, Aizenberg J, Falini G. Beyond biotemplating: multiscale porous inorganic materials with high catalytic efficiency. Chem Commun (Camb) 2020; 56:3389-3392. [DOI: 10.1039/d0cc00651c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biotemplating makes it possible to prepare materials with complex structures by taking advantage of nature's ability to generate unique morphologies.
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Affiliation(s)
- Giulia Magnabosco
- Department of Chemistry “Giacomo Ciamician”
- University of Bologna
- 40126 Bologna
- Italy
| | - Irene Papiano
- Department of Chemistry “Giacomo Ciamician”
- University of Bologna
- 40126 Bologna
- Italy
| | - Michael Aizenberg
- Wyss Institute for Biologically Inspired Engineering
- Harvard University
- Cambridge
- USA
| | - Joanna Aizenberg
- Wyss Institute for Biologically Inspired Engineering
- Harvard University
- Cambridge
- USA
- John A. Paulson School of Engineering and Applied Sciences
| | - Giuseppe Falini
- Department of Chemistry “Giacomo Ciamician”
- University of Bologna
- 40126 Bologna
- Italy
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22
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Tsao C, Yu PT, Wang CC, Chan JCC. Formation of nano-magnesite in the calcareous spicules prepared under ambient conditions. Chem Commun (Camb) 2020; 56:6925-6928. [DOI: 10.1039/d0cc02961k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanocrystallites of magnesite were found in calcareous spicules prepared under ambient conditions.
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Affiliation(s)
- Chieh Tsao
- Department of Chemistry
- National Taiwan University
- Taipei
- Taiwan
| | - Pao-Tao Yu
- Department of Chemistry
- National Taiwan University
- Taipei
- Taiwan
| | - Chun-Chieh Wang
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
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Albéric M, Stifler CA, Zou Z, Sun CY, Killian CE, Valencia S, Mawass MA, Bertinetti L, Gilbert PUPA, Politi Y. Growth and regrowth of adult sea urchin spines involve hydrated and anhydrous amorphous calcium carbonate precursors. JOURNAL OF STRUCTURAL BIOLOGY-X 2019; 1:100004. [PMID: 32647811 PMCID: PMC7337052 DOI: 10.1016/j.yjsbx.2019.100004] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 01/27/2019] [Accepted: 01/28/2019] [Indexed: 01/25/2023]
Abstract
In various mineralizing marine organisms, calcite or aragonite crystals form through the initial deposition of amorphous calcium carbonate (ACC) phases with different hydration levels. Using X-ray PhotoEmission Electron spectroMicroscopy (X-PEEM), ACCs with varied spectroscopic signatures were previously identified. In particular, ACC type I and II were recognized in embryonic sea urchin spicules. ACC type I was assigned to hydrated ACC based on spectral similarity with synthetic hydrated ACC. However, the identity of ACC type II has never been unequivocally determined experimentally. In the present study we show that synthetic anhydrous ACC and ACC type II identified here in sea urchin spines, have similar Ca L2,3-edge spectra. Moreover, using X-PEEM chemical mapping, we revealed the presence of ACC-H2O and anhydrous ACC in growing stereom and septa regions of sea urchin spines, supporting their role as precursor phases in both structures. However, the distribution and the abundance of the two ACC phases differ substantially between the two growing structures, suggesting a variation in the crystal growth mechanism; in particular, ACC dehydration, in the two-step reaction ACC-H2O → ACC → calcite, presents different kinetics, which are proposed to be controlled biologically.
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Affiliation(s)
- Marie Albéric
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - Cayla A Stifler
- Department of Physics, University of Wisconsin, Madison, WI 53706, USA
| | - Zhaoyong Zou
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany.,State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, China
| | - Chang-Yu Sun
- Department of Physics, University of Wisconsin, Madison, WI 53706, USA.,Materials Science Program, University of Wisconsin, Madison, WI 53706, USA
| | - Christopher E Killian
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Sergio Valencia
- Helmholtz-Zentrum Berlin für Materialen & Energie, 12489 Berlin, Germany
| | | | - Luca Bertinetti
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - Pupa U P A Gilbert
- Department of Physics, University of Wisconsin, Madison, WI 53706, USA.,Departments of Chemistry, Geoscience, Materials Science and Engineering, University of Wisconsin, Madison, WI 53706, USA
| | - Yael Politi
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
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Asnaghi V, Collard M, Mangialajo L, Gattuso JP, Dubois P. Bottom-up effects on biomechanical properties of the skeletal plates of the sea urchin Paracentrotus lividus (Lamarck, 1816) in an acidified ocean scenario. MARINE ENVIRONMENTAL RESEARCH 2019; 144:56-61. [PMID: 30591257 DOI: 10.1016/j.marenvres.2018.12.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 12/14/2018] [Accepted: 12/15/2018] [Indexed: 06/09/2023]
Abstract
Sea urchins, ecologically important herbivores of shallow subtidal temperate reefs, are considered particularly threatened in a future ocean acidification scenario, since their carbonate structures (skeleton and grazing apparatus) are made up of the very soluble high-magnesium calcite, particularly sensitive to a decrease in pH. The biomechanical properties of their skeletal structures are of great importance for their individual fitness, because the skeleton provides the means for locomotion, grazing and protection from predators. Sea urchin skeleton is composed of discrete calcite plates attached to each other at sutures by organic ligaments. The present study addressed the fate of the sea urchin Paracentrotus lividus (Lamarck, 1816) skeleton in acidified oceans, taking into account the combined effect of reduced pH and macroalgal diet, with potential cascading consequences at the ecosystem level. A breaking test on individual plates of juvenile specimens fed different macroalgal diets has been performed, teasing apart plate strength and stiffness from general robustness. Results showed no direct short-term effect of a decrease in seawater pH nor of the macroalgal diet on single plate mechanical properties. Nevertheless, results from apical plates, the ones presumably formed during the experimental period, provided an indication of a possible diet-mediated response, with sea urchins fed the more calcified macroalga sustaining higher forces before breakage than the one fed the non-calcified algae. This, on the long term, may produce bottom-up effects on sea urchins, leading to potential shifts in the ecosystem equilibrium under an ocean acidified scenario.
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Affiliation(s)
- Valentina Asnaghi
- Department of Earth, Environment and Life Science, DiSTAV, University of Genoa, Italy.
| | - Marie Collard
- Laboratoire de Biologie marine CP160/15, Université Libre de Bruxelles, Av F.D. Roosevelt, 50, B-1050, Bruxelles, Belgium
| | - Luisa Mangialajo
- Université de Nice-Sophia Antipolis, EA 4228 ECOMERS, Nice, France
| | - Jean-Pierre Gattuso
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, F 06230, Villefranche-sur-mer, France; Institute for Sustainable Development and International Relations, Sciences Po, 27 rue Saint Guillaume, F75007, Paris, France
| | - Philippe Dubois
- Laboratoire de Biologie marine CP160/15, Université Libre de Bruxelles, Av F.D. Roosevelt, 50, B-1050, Bruxelles, Belgium
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Seknazi E, Pokroy B. Residual Strain and Stress in Biocrystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707263. [PMID: 29766594 DOI: 10.1002/adma.201707263] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 03/07/2018] [Indexed: 06/08/2023]
Abstract
The development of residual strains within a material is a valuable engineering technique for increasing the material's strength and toughness. Residual strains occur naturally in some biominerals and are an important feature that is recently highlighted in biomineral studies. Here, manifestations of internal residual strains detected in biominerals are reviewed. The mechanisms by which they develop, as well as their impact on the biominerals' mechanical properties, are described. The question as to whether they can be utilized in multiscale strengthening and toughening strategies for biominerals is discussed.
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Affiliation(s)
- Eva Seknazi
- Department of Materials Science and Engineering and the Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, 32000, Haifa, Israel
| | - Boaz Pokroy
- Department of Materials Science and Engineering and the Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, 32000, Haifa, Israel
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26
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Stifler CA, Wittig NK, Sassi M, Sun CY, Marcus MA, Birkedal H, Beniash E, Rosso KM, Gilbert PUPA. X-ray Linear Dichroism in Apatite. J Am Chem Soc 2018; 140:11698-11704. [DOI: 10.1021/jacs.8b05547] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cayla A. Stifler
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Nina Kølln Wittig
- Department of Chemistry and iNANO, Aarhus University, Aarhus, 8000, Denmark
| | - Michel Sassi
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Chang-Yu Sun
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Matthew A. Marcus
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Henrik Birkedal
- Department of Chemistry and iNANO, Aarhus University, Aarhus, 8000, Denmark
| | - Elia Beniash
- Departments of Oral Biology and Bioengineering, Center for Craniofacial Regeneration, McGowan Institute for Regenerative Medicine, School of Dental Medicine, UPitt, Pittsburgh, Pennsylvania 15261, United States
| | - Kevin M. Rosso
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Pupa U. P. A. Gilbert
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, United States
- Departments of Chemistry, Materials Science, and Geoscience, University of Wisconsin, Madison, Wisconsin 53706, United States
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Dery A, Tran PD, Compère P, Dubois P. Cidaroids spines facing ocean acidification. MARINE ENVIRONMENTAL RESEARCH 2018; 138:9-18. [PMID: 29625789 DOI: 10.1016/j.marenvres.2018.03.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 03/23/2018] [Accepted: 03/27/2018] [Indexed: 06/08/2023]
Abstract
When facing seawater undersaturated towards calcium carbonates, spines of classical sea urchins (euechinoids) show traces of corrosion although they are covered by an epidermis. Cidaroids (a sister clade of euechinoids) are provided with mature spines devoid of epidermis, which makes them, at first sight, more sensitive to dissolution when facing undersaturated seawater. A recent study showed that spines of a tropical cidaroid are resistant to dissolution due to the high density and the low magnesium concentration of the peculiar external spine layer, the cortex. The biofilm and epibionts covering the spines was also suggested to take part in the spine protection. Here, we investigate the protective role of these factors in different cidaroid species from a broad range of latitude, temperature and depth. The high density of the cortical layer and the cover of biofilm and epibionts were confirmed as key protection against dissolution. The low magnesium concentration of cidaroid spines compared to that of euechinoid ones makes them less soluble in general.
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Affiliation(s)
- Aurélie Dery
- Laboratoire de Biologie Marine, Université Libre de Bruxelles, avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium.
| | - Phuong Dat Tran
- Laboratoire de Biologie Marine, Université Libre de Bruxelles, avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium
| | - Philippe Compère
- Laboratoire de Morphologie Fonctionnelle et Evolutive, Morphologie ultrastructurale, allée du 6 Août 15, 4000 Liège, Belgium
| | - Philippe Dubois
- Laboratoire de Biologie Marine, Université Libre de Bruxelles, avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium
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Morphology and porosity of the spines of the sea urchin Heterocentrotus mamillatus and their implications on the mechanical performance. ZOOMORPHOLOGY 2017. [DOI: 10.1007/s00435-017-0385-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Su FY, Bushong EA, Deerinck TJ, Seo K, Herrera S, Graeve OA, Kisailus D, Lubarda VA, McKittrick J. Spines of the porcupine fish: Structure, composition, and mechanical properties. J Mech Behav Biomed Mater 2017; 73:38-49. [DOI: 10.1016/j.jmbbm.2017.02.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 02/04/2017] [Accepted: 02/26/2017] [Indexed: 10/20/2022]
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30
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Merino M, Vicente E, Gonzales KN, Torres FG. Ageing and degradation determines failure mode on sea urchin spines. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 78:1086-1092. [DOI: 10.1016/j.msec.2017.04.155] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 12/28/2016] [Accepted: 04/27/2017] [Indexed: 11/16/2022]
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Iglikowska A, Najorka J, Voronkov A, Chełchowski M, Kukliński P. Variability in magnesium content in Arctic echinoderm skeletons. MARINE ENVIRONMENTAL RESEARCH 2017; 129:207-218. [PMID: 28624116 DOI: 10.1016/j.marenvres.2017.06.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/02/2017] [Accepted: 06/03/2017] [Indexed: 05/27/2023]
Abstract
In this study, 235 measurements of magnesium concentration in echinoderm's skeletons were compiled, including 30 species and 216 specimens collected from northern and western Barents Sea. We aimed to reveal the scale of Mg variation in the skeletons of Arctic echinoderms. Furthermore, we attempted to examine whether the Mg concentration in echinoderm skeletons is determined primarily by biological factors or is a passive result of environmental influences. We found that the Mg concentration in echinoderm skeletons was characteristic for particular echinoderm classes or was even species-specific. The highest Mg contents were observed in asteroids, followed by ophiuroids, crinoids, and holothuroids, with the lowest values in echinoids. These results strongly imply that biological factors play an important role in controlling the incorporation of Mg into the skeletons of the studied individuals.
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Affiliation(s)
- A Iglikowska
- Marine Ecology Department, Institute of Oceanology Polish Academy of Sciences, Powstańców Warszawy 55, 81-712, Sopot, Poland.
| | - J Najorka
- Core Research Laboratories, The Natural History Museum, Cromwell Road, London, SW7 5BD, UK.
| | - A Voronkov
- Institute of Marine Research, N-9294, Tromsø, Norway.
| | - M Chełchowski
- Marine Ecology Department, Institute of Oceanology Polish Academy of Sciences, Powstańców Warszawy 55, 81-712, Sopot, Poland.
| | - P Kukliński
- Marine Ecology Department, Institute of Oceanology Polish Academy of Sciences, Powstańców Warszawy 55, 81-712, Sopot, Poland.
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Labonte D, Lenz AK, Oyen ML. On the relationship between indentation hardness and modulus, and the damage resistance of biological materials. Acta Biomater 2017; 57:373-383. [PMID: 28546134 DOI: 10.1016/j.actbio.2017.05.034] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/20/2017] [Accepted: 05/15/2017] [Indexed: 12/28/2022]
Abstract
The remarkable mechanical performance of biological materials is based on intricate structure-function relationships. Nanoindentation has become the primary tool for characterising biological materials, as it allows to relate structural changes to variations in mechanical properties on small scales. However, the respective theoretical background and associated interpretation of the parameters measured via indentation derives largely from research on 'traditional' engineering materials such as metals or ceramics. Here, we discuss the functional relevance of indentation hardness in biological materials by presenting a meta-analysis of its relationship with indentation modulus. Across seven orders of magnitude, indentation hardness was directly proportional to indentation modulus. Using a lumped parameter model to deconvolute indentation hardness into components arising from reversible and irreversible deformation, we establish criteria which allow to interpret differences in indentation hardness across or within biological materials. The ratio between hardness and modulus arises as a key parameter, which is related to the ratio between irreversible and reversible deformation during indentation, the material's yield strength, and the resistance to irreversible deformation, a material property which represents the energy required to create a unit volume of purely irreversible deformation. Indentation hardness generally increases upon material dehydration, however to a larger extent than expected from accompanying changes in indentation modulus, indicating that water acts as a 'plasticiser'. A detailed discussion of the role of indentation hardness, modulus and toughness in damage control during sharp or blunt indentation yields comprehensive guidelines for a performance-based ranking of biological materials, and suggests that quasi-plastic deformation is a frequent yet poorly understood damage mode, highlighting an important area of future research. STATEMENT OF SIGNIFICANCE Instrumented indentation is a widespread tool for characterising the mechanical properties of biological materials. Here, we show that the ratio between indentation hardness and modulus is approximately constant in biological materials. A simple elastic-plastic series deformation model is employed to rationalise part of this correlation, and criteria for a meaningful comparison of indentation hardness across biological materials are proposed. The ratio between indentation hardness and modulus emerges as the key parameter characterising the relative amount of irreversible deformation during indentation. Despite their comparatively high hardness to modulus ratio, biological materials are susceptible to quasiplastic deformation, due to their high toughness: quasi-plastic deformation is hence hypothesised to be a frequent yet poorly understood phenomenon, highlighting an important area of future research.
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Emerson CE, Reinardy HC, Bates NR, Bodnar AG. Ocean acidification impacts spine integrity but not regenerative capacity of spines and tube feet in adult sea urchins. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170140. [PMID: 28573022 PMCID: PMC5451823 DOI: 10.1098/rsos.170140] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 04/19/2017] [Indexed: 05/15/2023]
Abstract
Increasing atmospheric carbon dioxide (CO2) has resulted in a change in seawater chemistry and lowering of pH, referred to as ocean acidification. Understanding how different organisms and processes respond to ocean acidification is vital to predict how marine ecosystems will be altered under future scenarios of continued environmental change. Regenerative processes involving biomineralization in marine calcifiers such as sea urchins are predicted to be especially vulnerable. In this study, the effect of ocean acidification on regeneration of external appendages (spines and tube feet) was investigated in the sea urchin Lytechinus variegatus exposed to ambient (546 µatm), intermediate (1027 µatm) and high (1841 µatm) partial pressure of CO2 (pCO2) for eight weeks. The rate of regeneration was maintained in spines and tube feet throughout two periods of amputation and regrowth under conditions of elevated pCO2. Increased expression of several biomineralization-related genes indicated molecular compensatory mechanisms; however, the structural integrity of both regenerating and homeostatic spines was compromised in high pCO2 conditions. Indicators of physiological fitness (righting response, growth rate, coelomocyte concentration and composition) were not affected by increasing pCO2, but compromised spine integrity is likely to have negative consequences for defence capabilities and therefore survival of these ecologically and economically important organisms.
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Affiliation(s)
- Chloe E. Emerson
- Bermuda Institute of Ocean Sciences, 17 Biological Station, St George's GE 01, Bermuda
| | - Helena C. Reinardy
- Bermuda Institute of Ocean Sciences, 17 Biological Station, St George's GE 01, Bermuda
| | - Nicholas R. Bates
- Bermuda Institute of Ocean Sciences, 17 Biological Station, St George's GE 01, Bermuda
- Department of Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton, UK
| | - Andrea G. Bodnar
- Bermuda Institute of Ocean Sciences, 17 Biological Station, St George's GE 01, Bermuda
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Dery A, Collard M, Dubois P. Ocean Acidification Reduces Spine Mechanical Strength in Euechinoid but Not in Cidaroid Sea Urchins. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:3640-3648. [PMID: 28267915 DOI: 10.1021/acs.est.6b05138] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Echinoderms are considered particularly sensitive to ocean acidification (OA) as their skeleton is made of high-magnesium calcite, one of the most soluble forms of calcium carbonate. Recent studies have investigated effects of OA on the skeleton of "classical" sea urchins (euechinoids), but the impact of etching on skeleton mechanical properties is almost unknown. Furthermore, the integrity of the skeleton of cidaroids has never been assessed, although their extracellular fluid is under-saturated with respect to their skeleton, and the skeleton of their primary spines is in direct contact with seawater. In this study, we compared the dissolution of test plates and spines as well as the spine mechanical properties (two-points bending tests) in a cidaroid (Eucidaris tribuloides) and a euechinoid (Tripneustes ventricosus) submitted to a 5 week acidification experiment (pHT of 8.1, 7.7, and 7.4). Test plates of both species were not affected by dissolution. The spines of E. tribuloides showed no mechanical effects at pHSW-T 7.4 despite having traces of corrosion on secondary spines. On the contrary, spines of the T. ventricosus were significantly etched at both pHSW-T 7.7 and 7.4 and their fracture force reduced by 16 to 35%, respectively. This increased brittleness is probably of little significance with regards to predation protection but has consequences in terms of energy allocation.
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Affiliation(s)
- Aurélie Dery
- Université Libre de Bruxelles , Laboratoire de Biologie Marine, avenue F.D. Roosevelt 50 CP 160/15 1050, Bruxelles, France
| | - Marie Collard
- Université Libre de Bruxelles , Laboratoire de Biologie Marine, avenue F.D. Roosevelt 50 CP 160/15 1050, Bruxelles, France
| | - Philippe Dubois
- Université Libre de Bruxelles , Laboratoire de Biologie Marine, avenue F.D. Roosevelt 50 CP 160/15 1050, Bruxelles, France
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Cao L, Li X, Zhou X, Li Y, Vecchio KS, Yang L, Cui W, Yang R, Zhu Y, Guo Z, Zhang X. Lightweight Open-Cell Scaffolds from Sea Urchin Spines with Superior Material Properties for Bone Defect Repair. ACS APPLIED MATERIALS & INTERFACES 2017; 9:9862-9870. [PMID: 28252933 DOI: 10.1021/acsami.7b01645] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Sea urchin spines (Heterocentrotus mammillatus), with a hierarchical open-cell structure similar to that of human trabecular bone and superior mechanical property (compressive strength ∼43.4 MPa) suitable for machining to shape, were explored for potential applications of bone defect repair. Finite element analyses reveal that the compressive stress concentrates along the dense growth rings and dissipates through strut structures of the stereoms, indicating that the exquisite mesostructures play an important role in high strength-to-weight ratios. The fracture strength of magnesium-substituted tricalcium phosphate (β-TCMP) scaffolds produced by hydrothermal conversion of urchin spines is about 9.3 MPa, comparable to that of human trabecular bone. New bone forms along outer surfaces of β-TCMP scaffolds after implantation in rabbit femoral defects for one month and grows into the majority of the inner open-cell spaces postoperation in three months, showing tight interface between the scaffold and regenerative bone tissue. Fusion of beagle lumbar facet joints using a Ti-6Al-4V cage and β-TCMP scaffold can be completed within seven months with obvious biodegradation of the β-TCMP scaffold, which is nearly completely degraded and replaced by newly formed bone ten months after implantation. Thus, sea urchin spines suitable for machining to shape have advantages for production of biodegradable artificial grafts for bone defect repair.
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Affiliation(s)
- Lei Cao
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , Shenyang, Liaoning 110016, China
| | - Xiaokang Li
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, Shaanxi 710032, China
| | - Xiaoshu Zhou
- Department of Orthopedics, The First Hospital of China Medical University , Shenyang, Liaoning 110001, China
| | - Yong Li
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, Shaanxi 710032, China
| | - Kenneth S Vecchio
- NanoEngineering Department, University of California, San Diego , La Jolla, California 92093, United States
| | - Lina Yang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , Shenyang, Liaoning 110016, China
| | - Wei Cui
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , Shenyang, Liaoning 110016, China
| | - Rui Yang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , Shenyang, Liaoning 110016, China
- School of Materials Science, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Yue Zhu
- Department of Orthopedics, The First Hospital of China Medical University , Shenyang, Liaoning 110001, China
| | - Zheng Guo
- Department of Orthopedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, Shaanxi 710032, China
| | - Xing Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , Shenyang, Liaoning 110016, China
- School of Materials Science, University of Science and Technology of China , Hefei, Anhui 230026, China
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Drozdov AL, Sharmankina VV, Zemnukhova LA, Polyakova NV. Chemical composition of spines and tests of sea urchins. BIOL BULL+ 2017. [DOI: 10.1134/s1062359016060078] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Rodríguez-Navarro C, Ruiz-Agudo E, Harris J, Wolf SE. Nonclassical crystallization in vivo et in vitro (II): Nanogranular features in biomimetic minerals disclose a general colloid-mediated crystal growth mechanism. J Struct Biol 2016; 196:260-287. [DOI: 10.1016/j.jsb.2016.09.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 09/05/2016] [Accepted: 09/07/2016] [Indexed: 12/20/2022]
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Naleway SE, Taylor JR, Porter MM, Meyers MA, McKittrick J. Structure and mechanical properties of selected protective systems in marine organisms. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 59:1143-1167. [DOI: 10.1016/j.msec.2015.10.033] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 09/29/2015] [Accepted: 10/12/2015] [Indexed: 12/18/2022]
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39
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Zhang Y, Chai S, Ma Y, Qi L. Investigations on the microstructures of sea urchin spines via selective dissolution. CrystEngComm 2016. [DOI: 10.1039/c6ce02074g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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40
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Puri T, Chalkidou A, Henley-Smith R, Roy A, Barber PR, Guerrero-Urbano T, Oakley R, Simo R, Jeannon JP, McGurk M, Odell EW, O'Doherty MJ, Marsden PK. A method for accurate spatial registration of PET images and histopathology slices. EJNMMI Res 2015; 5:64. [PMID: 26576995 PMCID: PMC4648832 DOI: 10.1186/s13550-015-0138-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 10/16/2015] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Accurate alignment between histopathology slices and positron emission tomography (PET) images is important for radiopharmaceutical validation studies. Limited data is available on the registration accuracy that can be achieved between PET and histopathology slices acquired under routine pathology conditions where slices may be non-parallel, non-contiguously cut and of standard block size. The purpose of this study was to demonstrate a method for aligning PET images and histopathology slices acquired from patients with laryngeal cancer and to assess the registration accuracy obtained under these conditions. METHODS Six subjects with laryngeal cancer underwent a (64)Cu-copper-II-diacetyl-bis(N4-methylthiosemicarbazone) ((64)Cu-ATSM) PET computed tomography (CT) scan prior to total laryngectomy. Sea urchin spines were inserted into the pathology specimen to act as fiducial markers. The specimen was fixed in formalin, as per standard histopathology operating procedures, and was then CT scanned and cut into millimetre-thick tissue slices. A subset of the tissue slices that included both tumour and fiducial markers was taken and embedded in paraffin blocks. Subsequently, microtome sectioning and haematoxylin and eosin staining were performed to produce 5-μm-thick tissue sections for microscopic digitisation. A series of rigid registration procedures was performed between the different imaging modalities (PET; in vivo CT-i.e. the CT component of the PET-CT; ex vivo CT; histology slices) with the ex vivo CT serving as the reference image. In vivo and ex vivo CTs were registered using landmark-based registration. Histopathology and ex vivo CT images were aligned using the sea urchin spines with additional anatomical landmarks where available. Registration errors were estimated using a leave-one-out strategy for in vivo to ex vivo CT and were estimated from the RMS landmark accuracy for histopathology to ex vivo CT. RESULTS The mean ± SD accuracy for registration of the in vivo to ex vivo CT images was 2.66 ± 0.66 mm, and the accuracy for registration of histopathology to ex vivo CT was 0.86 ± 0.41 mm. Estimating the PET to in vivo CT registration accuracy to equal the PET-CT alignment accuracy of 1 mm resulted in an overall average registration error between PET and histopathology slices of 3.0 ± 0.7 mm. CONCLUSIONS We have developed a registration method to align PET images and histopathology slices with an accuracy comparable to the spatial resolution of the PET images.
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Affiliation(s)
- Tanuj Puri
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK.
- Present address: Department of Oncology, University of Oxford, Oxford, UK.
| | - Anastasia Chalkidou
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK.
| | | | - Arunabha Roy
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK.
| | - Paul R Barber
- Department of Oncology, Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, University of Oxford, Oxford, UK.
- Institute for Mathematical and Molecular Biomedicine, King's College London, London, UK.
| | | | - Richard Oakley
- Department of Head & Neck Surgery, Guy's & St Thomas' NHS Foundation Trust, London, UK.
| | - Ricard Simo
- Department of Head & Neck Surgery, Guy's & St Thomas' NHS Foundation Trust, London, UK.
| | - Jean-Pierre Jeannon
- Department of Head & Neck Surgery, Guy's & St Thomas' NHS Foundation Trust, London, UK.
| | - Mark McGurk
- Department of Head & Neck Surgery, Guy's & St Thomas' NHS Foundation Trust, London, UK.
| | - Edward W Odell
- Oral Pathology Department, King's College London, London, UK.
| | - Michael J O'Doherty
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK. michael.o'
| | - Paul K Marsden
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK.
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41
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Kanold JM, Lemloh ML, Schwendt P, Burghard Z, Baier J, Herbst F, Bill J, Marin F, Brümmer F. In vivo enrichment of magnesium ions modifies sea urchin spicule properties. BIOINSPIRED BIOMIMETIC AND NANOBIOMATERIALS 2015. [DOI: 10.1680/bbn.14.00023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Sea urchin embryos produce an endoskeleton composed of two symmetric spicules that consist of calcite, containing approximately 5% magnesium. The function of magnesium ions in mineral formation in vivo and the consequence of their incorporation into the mineral on mechanical properties are largely unknown. The authors investigated the in vivo effects of excess magnesium ion concentrations in the medium on skeletal development of Arbacia lixula. Morphological deformations of pluteus larval spicules were observed after cultivation in Mg2+-enriched sea water. Energy dispersive X-ray spectroscopy showed that magnesium ions were homogeneously distributed for complete larvae and spicule cross-sections. Magnesium ion content was quantified by inductively coupled plasma optical emission spectrometry, which revealed a considerable increased incorporation of magnesium ions into spicules of larvae from Mg2+-enriched sea water. However, no change in crystal polymorph formation was observed by X-ray diffraction. Mechanical properties of spicule cross-sections were analysed by nanoindentation and revealed significantly higher stiffness values for spicules from Mg2+-enriched sea water compared to the control, whereas no significant change in hardness values was obtained. This in vivo study shows that increased magnesium ion incorporation into sea urchin larval spicules modifies the mineral properties and supports this model to investigate the effect of minor ions on biomineralisation.
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Affiliation(s)
- Julia Maxi Kanold
- Institute of Biomaterials and Biomolecular Systems, Department of Zoology, University of Stuttgart, Pfaffenwaldring, Stuttgart, Germany
| | - Marie-Louise Lemloh
- Institute of Biomaterials and Biomolecular Systems, Department of Zoology, University of Stuttgart, Pfaffenwaldring, Stuttgart, Germany
- INM – Leibniz Institute for New Materials, Biomineralization Group, Campus D2 2, Saarbrücken, Germany
| | - Peggy Schwendt
- Institute of Biomaterials and Biomolecular Systems, Department of Zoology, University of Stuttgart, Pfaffenwaldring, Stuttgart, Germany
| | - Zaklina Burghard
- Institute for Materials Science, University of Stuttgart, Heisenbergstrasse, Stuttgart, Germany
| | - Johannes Baier
- Institute for Materials Science, University of Stuttgart, Heisenbergstrasse, Stuttgart, Germany
| | - Frédéric Herbst
- ICB, UMR 5209 – DAI, Université de Bourgogne, UFR Sciences et Techniques, Dijon, France
| | - Joachim Bill
- Professor, Institute for Materials Science, University of Stuttgart, Heisenbergstrasse, Stuttgart, Germany
| | - Frédéric Marin
- UMR CNRS 6282 Biogéosciences, Université de Bourgogne, Dijion, France
| | - Franz Brümmer
- Professor, Institute of Biomaterials and Biomolecular Systems, Department of Zoology, University of Stuttgart, Pfaffenwaldring, Stuttgart, Germany
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42
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Echinoderms: Hierarchically Organized Light Weight Skeletons. BIOLOGICALLY-INSPIRED SYSTEMS 2015. [DOI: 10.1007/978-94-017-9398-8_8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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43
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Byrne M, Smith AM, West S, Collard M, Dubois P, Graba-landry A, Dworjanyn SA. Warming influences Mg2+ content, while warming and acidification influence calcification and test strength of a sea urchin. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:12620-12627. [PMID: 25252045 DOI: 10.1021/es5017526] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We examined the long-term effects of near-future changes in temperature and acidification on skeletal mineralogy, thickness, and strength in the sea urchin Tripneustes gratilla reared in all combinations of three pH (pH 8.1, 7.8, 7.6) and three temperatures (22 °C, 25 °C, 28 °C) from the early juvenile to adult, over 146 days. As the high-magnesium calcite of the echinoderm skeleton is a biomineral form highly sensitive to acidification, and influenced by temperature, we documented the MgCO3 content of the spines, test plates, and teeth. The percentage of MgCO3 varied systematically, with more Mg2+ in the test and spines. The percentage of MgCO3 in the test and teeth, but not the spines increased with temperature. Acidification did not change the percentage MgCO3. Test thickness increased with warming and decreased at pH 7.6, with no interaction between these factors. In crushing tests live urchins mostly ruptured at sutures between the plates. The force required to crush a live urchin was reduced in animals reared in low pH conditions but increased in those reared in warm conditions, a result driven by differences in urchin size. It appears that the interactive effects of warming and acidification on the Mg2+ content and protective function of the sea urchin skeleton will play out in a complex way as global climatic change unfolds.
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Affiliation(s)
- Maria Byrne
- Schools of Medical and Biological Science, University of Sydney , Sydney, New South Wales 2006, Australia
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44
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Goetz AJ, Griesshaber E, Abel R, Fehr T, Ruthensteiner B, Schmahl W. Tailored order: the mesocrystalline nature of sea urchin teeth. Acta Biomater 2014; 10:3885-98. [PMID: 24937138 DOI: 10.1016/j.actbio.2014.06.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 05/27/2014] [Accepted: 06/09/2014] [Indexed: 11/26/2022]
Abstract
We investigated the pattern of crystal co-orientation at different length scales, together with variations in chemical composition and nanomechanical properties in the teeth of the modern sea urchin Paracentrotus lividus with electron backscatter diffraction (EBSD), electron probe microanalysis, energy-dispersive X-ray spectroscopy and nanoindentation testing. Modern sea urchin teeth are Mg-dominated calcite composite materials. They are distinctly harder than inorganically precipitated calcite. Some parts exceed even the hardness of dolomite. The teeth show a structuring of their mechanical properties that can be correlated to variations in major element chemical composition, such that their hardness is positively correlated to their magnesium contents. Mg/Ca ratio in Paracentrotus lividus varies between 10 and 26mol.%. Nanohardness of the tooth scatters between 3.5 and >8GPa compared to values of 3.0±0.2, 7.3±0.1 and 9.2±0.9GPa measured on the (104) planes of inorganic calcite, dolomite and magnesite, respectively. High-resolution EBSD shows that major structural units and subunits of the tooth of Paracentrotus lividus are tilted to each other by ∼3-5° and 1-2°, respectively. This indicates that the tooth is not a single crystal. With EBSD we can show that the tooth of the sea urchin Paracentrotus lividus is a hierarchically assembled biological mesocrystal with a mosaic texture. In comparison to the misorientation spread of 0.5° of calcite grown from solution, misorientation in the tooth varies between 2° and 4°. Thus, the self-sharpening feature of the tooth is enabled by a close interplay of its highly evolved micro- to nanostructure, structural unit size variations with a varying degree of crystal orientation, chemical structuring of the mineral component and a gradation of incorporated organic polymers.
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45
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Dubois P. The skeleton of postmetamorphic echinoderms in a changing world. THE BIOLOGICAL BULLETIN 2014; 226:223-36. [PMID: 25070867 DOI: 10.1086/bblv226n3p223] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Available evidence on the impact of acidification and its interaction with warming on the skeleton of postmetamorphic (juvenile and adult) echinoderms is reviewed. Data are available on sea urchins, starfish, and brittle stars in 33 studies. Skeleton growth of juveniles of all sea urchin species studied so far is affected from pH 7.8 to 7.6 in seawater, values that are expected to be reached during the 21st century. Growth in adult sea urchins (six species studied) is apparently only marginally affected at seawater pH relevant to this century. The interacting effect of temperature differed according to studies. Juvenile starfish as well as adults seem to be either not impacted or even boosted by acidification. Brittle stars show moderate effects at pH below or equal to 7.4. Dissolution of the body wall skeleton is unlikely to be a major threat to sea urchins. Spines, however, due to their exposed position, are more prone to this threat, but their regeneration abilities can probably ensure their maintenance, although this could have an energetic cost and induce changes in resource allocation. No information is available on skeleton dissolution in starfish, and the situation in brittle stars needs further assessment. Very preliminary evidence indicates that mechanical properties in sea urchins could be affected. So, although the impact of ocean acidification on the skeleton of echinoderms has been considered as a major threat from the first studies, we need a better understanding of the induced changes, in particular the functional consequences of growth modifications and dissolution related to mechanical properties. It is suggested to focus studies on these aspects.
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Affiliation(s)
- Philippe Dubois
- Laboratoire de Biologie marine CP160/15, Université Libre de Bruxelles, av F.D. Roosevelt, 50, B-1050 Bruxelles, Belgium
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46
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Shir IB, Kababya S, Schmidt A. Molecular-Level StructureProperty Relationships in Biogenic Calcium Carbonates: The Unique Insights of Solid-State NMR Spectroscopy. Isr J Chem 2014. [DOI: 10.1002/ijch.201300121] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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47
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Long X, Ma Y, Qi L. Biogenic and synthetic high magnesium calcite - a review. J Struct Biol 2013; 185:1-14. [PMID: 24291472 DOI: 10.1016/j.jsb.2013.11.004] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 09/23/2013] [Accepted: 11/05/2013] [Indexed: 10/26/2022]
Abstract
Systematic studies on the Mg distributions, the crystal orientations, the formation mechanisms and the mechanical properties of biogenic high-Mg calcites in different marine organisms were summarized in detail in this review. The high-Mg calcites in the hard tissues of marine organisms mentioned generally own a few common features as follows. Firstly, the Mg distribution is not uniform in most of the minerals. Secondly, high-Mg calcite biominerals are usually composed of nanoparticles that own almost the same crystallographic orientations and thus they behave like single crystals or mesocrystals. Thirdly, the formation of thermodynamically unstable high-Mg calcites in marine organisms under mild conditions is affected by three key factors, that is, the formation of amorphous calcium (magnesium) carbonate precursor, the control of polymorph via biomolecules and the high Mg/Ca ratios in modern sea. Lastly, the existence of Mg ions in the Mg-containing calcite may improve the mechanical properties of biogenic minerals. Furthermore, the key progress in the synthesis of high-Mg calcites in the laboratory based on the formation mechanisms of the biogenic high-Mg calcites was reviewed. Many researchers have realized the synthesis of high-Mg calcites in the laboratory under ambient conditions with the help of intermediate amorphous phase, mixed solvents, organic/inorganic surfaces and soluble additives. Studies on the structural analysis and formation mechanisms of thermodynamically unstable biogenic high-Mg calcite minerals may shed light on the preparation of functional materials with enhanced mechanical properties.
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Affiliation(s)
- Xia Long
- Beijing National laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University, Beijing 100871, PR China
| | - Yurong Ma
- Beijing National laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University, Beijing 100871, PR China.
| | - Limin Qi
- Beijing National laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University, Beijing 100871, PR China
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48
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Chan VBS, Thiyagarajan V, Lu XW, Zhang T, Shih K. Temperature dependent effects of elevated CO2 on shell composition and mechanical properties of Hydroides elegans: insights from a multiple stressor experiment. PLoS One 2013; 8:e78945. [PMID: 24265732 PMCID: PMC3827122 DOI: 10.1371/journal.pone.0078945] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Accepted: 09/16/2013] [Indexed: 11/23/2022] Open
Abstract
The majority of marine benthic invertebrates protect themselves from predators by producing calcareous tubes or shells that have remarkable mechanical strength. An elevation of CO2 or a decrease in pH in the environment can reduce intracellular pH at the site of calcification and thus interfere with animal’s ability to accrete CaCO3. In nature, decreased pH in combination with stressors associated with climate change may result in the animal producing severely damaged and mechanically weak tubes. This study investigated how the interaction of environmental drivers affects production of calcareous tubes by the serpulid tubeworm, Hydroides elegans. In a factorial manipulative experiment, we analyzed the effects of pH (8.1 and 7.8), salinity (34 and 27‰), and temperature (23°C and 29°C) on the biomineral composition, ultrastructure and mechanical properties of the tubes. At an elevated temperature of 29°C, the tube calcite/aragonite ratio and Mg/Ca ratio were both increased, the Sr/Ca ratio was decreased, and the amorphous CaCO3 content was reduced. Notably, at elevated temperature with decreased pH and reduced salinity, the constructed tubes had a more compact ultrastructure with enhanced hardness and elasticity compared to decreased pH at ambient temperature. Thus, elevated temperature rescued the decreased pH-induced tube impairments. This indicates that tubeworms are likely to thrive in early subtropical summer climate. In the context of climate change, tubeworms could be resilient to the projected near-future decreased pH or salinity as long as surface seawater temperature rise at least by 4°C.
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Affiliation(s)
- Vera B. S. Chan
- Swire Institute of Marine Sciences and School of Biological Sciences, The University of Hong Kong, Hong Kong SAR
| | - Vengatesen Thiyagarajan
- Swire Institute of Marine Sciences and School of Biological Sciences, The University of Hong Kong, Hong Kong SAR
- * E-mail:
| | - Xing Wen Lu
- Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR
| | - Tong Zhang
- Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR
| | - Kaimin Shih
- Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR
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49
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Olson IC, Metzler RA, Tamura N, Kunz M, Killian CE, Gilbert PUPA. Crystal lattice tilting in prismatic calcite. J Struct Biol 2013; 183:180-90. [PMID: 23806677 DOI: 10.1016/j.jsb.2013.06.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 05/26/2013] [Accepted: 06/09/2013] [Indexed: 10/26/2022]
Abstract
We analyzed the calcitic prismatic layers in Atrina rigida (Ar), Haliotis iris (Hi), Haliotis laevigata (HL), Haliotis rufescens (Hrf), Mytilus californianus (Mc), Pinctada fucata (Pf), Pinctada margaritifera (Pm) shells, and the aragonitic prismatic layer in the Nautilus pompilius (Np) shell. Dramatic structural differences were observed across species, with 100-μm wide single-crystalline prisms in Hi, HL and Hrf, 1-μm wide needle-shaped calcite prisms in Mc, 1-μm wide spherulitic aragonite prisms in Np, 20-μm wide single-crystalline calcite prisms in Ar, and 20-μm wide polycrystalline calcite prisms in Pf and Pm. The calcite prisms in Pf and Pm are subdivided into sub-prismatic domains of orientations, and within each of these domains the calcite crystal lattice tilts gradually over long distances, on the order of 100 μm, with an angle spread of crystal orientation of 10-20°. Furthermore, prisms in Pf and Pm are harder than in any other calcite prisms analyzed, their nanoparticles are smaller, and the angle spread is strongly correlated with hardness in all shells that form calcitic prismatic layers. One can hypothesize a causal relationship of these correlated parameters: greater angle spread may confer greater hardness and resistance to wear, thus providing Pf and Pm with a structural advantage in their environment. This is the first structure-property relationship thus far hypothesized in mollusk shell prisms.
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Affiliation(s)
- Ian C Olson
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706, USA
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50
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Comparative morphological and structural analysis of selected cidaroid and camarodont sea urchin spines. ZOOMORPHOLOGY 2013. [DOI: 10.1007/s00435-013-0192-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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