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Peng B, Wei Y, Qin Y, Dai J, Li Y, Liu A, Tian Y, Han L, Zheng Y, Wen P. Machine learning-enabled constrained multi-objective design of architected materials. Nat Commun 2023; 14:6630. [PMID: 37857648 PMCID: PMC10587057 DOI: 10.1038/s41467-023-42415-y] [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: 06/23/2023] [Accepted: 10/10/2023] [Indexed: 10/21/2023] Open
Abstract
Architected materials that consist of multiple subelements arranged in particular orders can demonstrate a much broader range of properties than their constituent materials. However, the rational design of these materials generally relies on experts' prior knowledge and requires painstaking effort. Here, we present a data-efficient method for the high-dimensional multi-property optimization of 3D-printed architected materials utilizing a machine learning (ML) cycle consisting of the finite element method (FEM) and 3D neural networks. Specifically, we apply our method to orthopedic implant design. Compared to uniform designs, our experience-free method designs microscale heterogeneous architectures with a biocompatible elastic modulus and higher strength. Furthermore, inspired by the knowledge learned from the neural networks, we develop machine-human synergy, adapting the ML-designed architecture to fix a macroscale, irregularly shaped animal bone defect. Such adaptation exhibits 20% higher experimental load-bearing capacity than the uniform design. Thus, our method provides a data-efficient paradigm for the fast and intelligent design of architected materials with tailored mechanical, physical, and chemical properties.
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Affiliation(s)
- Bo Peng
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing, China
- Department of Mechanical Engineering, Tsinghua University, Beijing, China
| | - Ye Wei
- Institute for Interdisciplinary Information Science, Tsinghua University, Beijing, China.
| | - Yu Qin
- Department of Materials Science and Engineering, Peking University, Beijing, China.
| | - Jiabao Dai
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing, China
- Department of Mechanical Engineering, Tsinghua University, Beijing, China
| | - Yue Li
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
| | - Aobo Liu
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing, China
- Department of Mechanical Engineering, Tsinghua University, Beijing, China
| | - Yun Tian
- Department of Orthopaedics, Peking University Third Hospital, Beijing, China
| | - Liuliu Han
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
| | - Yufeng Zheng
- Department of Materials Science and Engineering, Peking University, Beijing, China
| | - Peng Wen
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing, China.
- Department of Mechanical Engineering, Tsinghua University, Beijing, China.
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2
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Margadant F, Almsherqi Z, Xu X, Deng Y. Optical Properties and Interference Effects of the Lens Mitochondrion. MEMBRANES 2023; 13:610. [PMID: 37367815 DOI: 10.3390/membranes13060610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 05/24/2023] [Accepted: 06/01/2023] [Indexed: 06/28/2023]
Abstract
The lens mitochondrion of the tree shrew, located along the optical pathway between the lens and photoreceptors, has been investigated. The results suggest that the lens mitochondrion acts as a quasi-bandgap or imperfect photonic crystal. Interference effects cause a shift in the focus and introduce wavelength-dependent behavior similar to dispersion. Optical channels within the mitochondrion form a mild waveguide, preferentially propagating light within certain compartments. The lens mitochondrion also functions as an imperfect UV-shielding interference filter. Overall, this study provides insights into the dual role of the lens mitochondrion and the complex behavior of light within biological systems.
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Affiliation(s)
- Felix Margadant
- Department of Molecular Cell Biology, Institute for Cancer Research, Radium University Hospital, 0379 Oslo, Norway
| | - Zakaria Almsherqi
- Department of Physiology, National University of Singapore, Singapore 117593, Singapore
| | - Xiaochun Xu
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Yuru Deng
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
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3
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Frenkel-Pinter M, Petrov AS, Matange K, Travisano M, Glass JB, Williams LD. Adaptation and Exaptation: From Small Molecules to Feathers. J Mol Evol 2022; 90:166-175. [PMID: 35246710 PMCID: PMC8975760 DOI: 10.1007/s00239-022-10049-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 01/26/2022] [Indexed: 11/27/2022]
Abstract
Evolution works by adaptation and exaptation. At an organismal level, exaptation and adaptation are seen in the formation of organelles and the advent of multicellularity. At the sub-organismal level, molecular systems such as proteins and RNAs readily undergo adaptation and exaptation. Here we suggest that the concepts of adaptation and exaptation are universal, synergistic, and recursive and apply to small molecules such as metabolites, cofactors, and the building blocks of extant polymers. For example, adenosine has been extensively adapted and exapted throughout biological evolution. Chemical variants of adenosine that are products of adaptation include 2' deoxyadenosine in DNA and a wide array of modified forms in mRNAs, tRNAs, rRNAs, and viral RNAs. Adenosine and its variants have been extensively exapted for various functions, including informational polymers (RNA, DNA), energy storage (ATP), metabolism (e.g., coenzyme A), and signaling (cyclic AMP). According to Gould, Vrba, and Darwin, exaptation imposes a general constraint on interpretation of history and origins; because of exaptation, extant function should not be used to explain evolutionary history. While this notion is accepted in evolutionary biology, it can also guide the study of the chemical origins of life. We propose that (i) evolutionary theory is broadly applicable from the dawn of life to the present time from molecules to organisms, (ii) exaptation and adaptation were important and simultaneous processes, and (iii) robust origin of life models can be constructed without conflating extant utility with historical basis of origins.
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Affiliation(s)
- Moran Frenkel-Pinter
- NASA Center for the Origins of Life, Atlanta, GA, 30332-0400, USA.,NSF-NASA Center of Chemical Evolution, Atlanta, GA, 30332-0400, USA.,Institute of Chemistry, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
| | - Anton S Petrov
- NASA Center for the Origins of Life, Atlanta, GA, 30332-0400, USA.,NSF-NASA Center of Chemical Evolution, Atlanta, GA, 30332-0400, USA.,School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332-0400, USA
| | - Kavita Matange
- NASA Center for the Origins of Life, Atlanta, GA, 30332-0400, USA.,School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332-0400, USA
| | - Michael Travisano
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Jennifer B Glass
- NASA Center for the Origins of Life, Atlanta, GA, 30332-0400, USA.,School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, 30332-0400, USA
| | - Loren Dean Williams
- NASA Center for the Origins of Life, Atlanta, GA, 30332-0400, USA. .,NSF-NASA Center of Chemical Evolution, Atlanta, GA, 30332-0400, USA. .,School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332-0400, USA.
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4
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Kong D, Liu R, Liu J, Zhou Q, Zhang J, Li W, Bai H, Hai C. Cubic Membranes Formation in Synchronized Human Hepatocellular Carcinoma Cells Reveals a Possible Role as a Structural Antioxidant Defense System in Cell Cycle Progression. Front Cell Dev Biol 2021; 8:617406. [PMID: 33381509 PMCID: PMC7769198 DOI: 10.3389/fcell.2020.617406] [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: 10/14/2020] [Accepted: 11/23/2020] [Indexed: 11/29/2022] Open
Abstract
Cubic membranes (CMs) represent unique biological membrane structures with highly curved three-dimensional periodic minimal surfaces, which have been observed in a wide range of cell types and organelles under various stress conditions (e. g., starvation, virus-infection, and oxidation). However, there are few reports on the biological roles of CMs, especially their roles in cell cycle. Hence, we established a stable cell population of human hepatocellular carcinoma cells (HepG2) of 100% S phase by thymidine treatment, and determined certain parameters in G2 phase released from S phase. Then we found a close relationship between CMs formation and cell cycle, and an increase in reactive oxygen species (ROS) and mitochondrial function. After the synchronization of HepG2 cells were induced, CMs were observed through transmission electron microscope in G2 phase but not in G1, S and M phase. Moreover, the increased ATP production, mitochondrial and intracellular ROS levels were also present in G2 phase, which demonstrated a positive correlation with CMs formation by Pearson correlation analysis. This study suggests that CMs may act as an antioxidant structure in response to mitochondria-derived ROS during G2 phase and thus participate in cell cycle progression.
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Affiliation(s)
- Deqin Kong
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China
| | - Rui Liu
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China
| | - Jiangzheng Liu
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China
| | - Qingbiao Zhou
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China
| | - Jiaxin Zhang
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China
| | - Wenli Li
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China
| | - Hua Bai
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China.,Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, Xi'an, China
| | - Chunxu Hai
- Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, The Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Department of Toxicology, School of Public Health, Air Force Medical University (Fourth Military Medical University), Xi'an, China
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5
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Cui C, Deng Y, Han L. Bicontinuous cubic phases in biological and artificial self-assembled systems. SCIENCE CHINA MATERIALS 2020; 63:686-702. [PMID: 32219007 PMCID: PMC7094945 DOI: 10.1007/s40843-019-1261-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 01/28/2020] [Indexed: 06/10/2023]
Abstract
Nature has created innumerable life forms with miraculous hierarchical structures and morphologies that are optimized for different life events through evolution over billions of years. Bicontinuous cubic structures, which are often described by triply periodic minimal surfaces (TPMSs) and their constant mean curvature (CMC)/parallel surface companions, are of special interest to various research fields because of their complex form with unique physical functionalities. This has prompted the scientific community to fully understand the formation, structure, and properties of these materials. In this review, we summarize and discuss the formation mechanism and relationships of the relevant biological structures and the artificial self-assembly systems. These structures can be formed through biological processes with amazing regulation across a great length scales; nevertheless, artificial construction normally produces the structure corresponding to the molecular size and shape. Notably, the block copolymeric system is considered to be an applicable and attractive model system for the study of biological systems due to their versatile design and rich phase behavior. Some of the phenomena found in these two systems are compared and discussed, and this information may provide new ideas for a comprehensive understanding of the relationship between molecular shape and resulting interface curvature and the self-assembly process in living organisms. We argue that the co-polymeric system may serve as a model to understand these biological systems and could encourage additional studies of artificial self-assembly and the creation of new functional materials.
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Affiliation(s)
- Congcong Cui
- School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 China
| | - Yuru Deng
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325001 China
| | - Lu Han
- School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 China
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6
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Mezzenga R, Seddon JM, Drummond CJ, Boyd BJ, Schröder-Turk GE, Sagalowicz L. Nature-Inspired Design and Application of Lipidic Lyotropic Liquid Crystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1900818. [PMID: 31222858 DOI: 10.1002/adma.201900818] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 04/16/2019] [Indexed: 05/20/2023]
Abstract
Amphiphilic lipids aggregate in aqueous solution into a variety of structural arrangements. Among the plethora of ordered structures that have been reported, many have also been observed in nature. In addition, due to their unique morphologies, the hydrophilic and hydrophobic domains, very high internal interfacial surface area, and the multitude of possible order-order transitions depending on environmental changes, very promising applications have been developed for these systems in recent years. These include crystallization in inverse bicontinuous cubic phases for membrane protein structure determination, generation of advanced materials, sustained release of bioactive molecules, and control of chemical reactions. The outstanding diverse functionalities of lyotropic liquid crystalline phases found in nature and industry are closely related to the topology, including how their nanoscopic domains are organized. This leads to notable examples of correlation between structure and macroscopic properties, which is itself central to the performance of materials in general. The physical origin of the formation of the known classes of lipidic lyotropic liquid crystalline phases, their structure, and their occurrence in nature are described, and their application in materials science and engineering, biology, medical, and pharmaceutical products, and food science and technology are exemplified.
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Affiliation(s)
- Raffaele Mezzenga
- ETH Zurich Department of Health Sciences and Technology, Schmelzbergstrasse 9, LFO E23, Zurich, 8092, Switzerland
- ETH Zurich Department of Materials, Wolfgang-Pauli-Strasse 10, Zurich, 8093, Switzerland
| | - John M Seddon
- Chemistry Department, Imperial College London, MSRH, Wood Lane, London, W12 0BZ, UK
| | - Calum J Drummond
- School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria, 3000, Australia
| | - Ben J Boyd
- Drug Delivery, Disposition and Dynamics and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Parade, Parkville, Victoria, 3052, Australia
| | - Gerd E Schröder-Turk
- College of Science, Health, Engineering and Education, Murdoch University, 90 South St, Murdoch, WA, 6150, Australia
- Department of Food Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
- Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, Lund, 22100, Sweden
| | - Laurent Sagalowicz
- Institute of Materials Science, Nestlé Research Center, CH-1000, Lausanne 26, Switzerland
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7
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Park JH, Lee JC. Peculiar elastic behavior of mechanical metamaterials with various minimal surfaces. Sci Rep 2019; 9:2941. [PMID: 30814531 PMCID: PMC6393440 DOI: 10.1038/s41598-019-38660-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 01/02/2019] [Indexed: 11/09/2022] Open
Abstract
Molecular dynamics simulations were performed on nanostructured metamaterials (NMs) with gyroid, diamond, and primitive structures to evaluate their mechanical behavior, especially elastic properties. Unlike the constant nature of Young's (E) and shear (μ) moduli of bulk materials, the values of both E and μ of NMs change with relative density and cell size but at different rates depending on the morphologies of the structure. This is particularly the case for μ; for a given relative density and cell size of NMs, the μ values differ greatly, depending on the types of structure, causing the NMs to display differing μ/E values and thus resistance to shear deformation. The mechanistic origin of this observation was analyzed by resolving the morphologies of the NMs in terms of the numbers and orientations of the fundamental structural motifs for constructing metamaterials.
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Affiliation(s)
- Jun-Hyoung Park
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, South Korea
| | - Jae-Chul Lee
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, South Korea.
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8
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Mocan M, Kamperman M, Leermakers FAM. Microphase Segregation of Diblock Copolymers Studied by the Self-Consistent Field Theory of Scheutjens and Fleer. Polymers (Basel) 2018; 10:polym10010078. [PMID: 30966118 PMCID: PMC6414839 DOI: 10.3390/polym10010078] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 01/08/2018] [Accepted: 01/09/2018] [Indexed: 11/24/2022] Open
Abstract
We used the self-consistent field (SCF) formalism of Scheutjens and Fleer (SF-SCF) to complement existing theoretical investigations on the phase behavior of block copolymer melts. This method employs the freely jointed chain (FJC) model for finite chain length and systematic differences exist compared to the classical SCF predictions. We focus on the critical and hexagonal (HEX) to lamellar (LAM) phase transition region at intermediate and strong segregations. Chain length (N) dependence of the critical point (χcr) was found to be χcrN=10.495(1+4/N). The characteristic spacing (D) of LAM was found as D=4/3N at the critical conditions. We present SF-SCF predictions for the phases single gyroid (SG), double gyroid (DG) and hexagonally perforated lamellar (HPL), in the region where HEX and LAM compete. At χN=30, N=300; we found SG and HPL were metastable with respect to LAM or HEX, DG was stable in a narrow region of the asymmetry ratio. In contrast to the latest predictions, at strong segregation χN=120, DG was found to be metastable. From the structural evolution of HPL, we speculate that this may be an intermediate phase that allows the system to go through various connectivity regimes between minority and majority blocks.
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Affiliation(s)
- Merve Mocan
- Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands.
| | - Marleen Kamperman
- Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands.
| | - Frans A M Leermakers
- Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands.
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9
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Sun Y, Padmanabhan P, Misra M, Escobedo FA. Molecular dynamics simulation of thermotropic bolaamphiphiles with a swallow-tail lateral chain: formation of cubic network phases. SOFT MATTER 2017; 13:8542-8555. [PMID: 29095474 DOI: 10.1039/c7sm01819c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
T-shaped bolaamphiphiles (TBA) with a swallow-tail lateral chain have been found to provide a fertile platform to produce complex liquid crystalline phases that are accessible through changes of temperature and lateral chain length and design. In this work, we use molecular simulations of a simple coarse-grained model to map out the phase behavior of this type of molecules. This model is based on the premise that the crucial details of the fluid structure stem from close range repulsions and the strong directional forces typical of hydrogen bonds. Our simulations confirm that TBAs exhibit a rich phase behavior upon increasing the length of their lateral chain. The simulations detect a double gyroid phase and an axial-bundle columnar phase which bear some structural resemblance to those found in the experiment. In addition, simulations predict two cocontinuous phases with 3D-periodicity: the "single" diamond and the "single" plumber's nightmare phase. Our analysis of energetic and entropic contributions to the free energy of phases formed by TBA with either swallow-tail or linear side-chains suggest that the 3D-periodic network phases formed by the former are stabilized by the large conformation entropy of the side-chains.
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Affiliation(s)
- Yangyang Sun
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, USA.
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10
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Park JH, Lee JC. Unusually high ratio of shear modulus to Young's modulus in a nano-structured gyroid metamaterial. Sci Rep 2017; 7:10533. [PMID: 28874740 PMCID: PMC5585398 DOI: 10.1038/s41598-017-10978-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 08/17/2017] [Indexed: 11/09/2022] Open
Abstract
Unlike the constant nature of elastic coefficients of isotropic bulk materials, the Young's (E) and shear (μ) moduli of nano-structured (NS) gyroid metamaterials change with relative density (ρ), but at different rates depending on the cell size of the structure. These elastic behaviors displayed by E and μ cause crossover/inversion of these two moduli, such that μ of the NS gyroid metamaterials is greater than E for the structures with ρ < 0.23. This peculiar elastic behavior causes NS gyroid metamaterials to display high μ/E values (~1.0), which are more than 250% larger than the typical values of the bulk material (~0.38), indicating that the NS gyroid metamaterial, even if it is light, is resistant to shear deformation. Here, we report the results of molecular dynamics simulations performed to elucidate the reason for unusually high μ/E values in NS gyroid metamaterials.
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Affiliation(s)
- Jun-Hyoung Park
- Department of Materials Science and Engineering, Korea University, Seoul, 136-713, South Korea
| | - Jae-Chul Lee
- Department of Materials Science and Engineering, Korea University, Seoul, 136-713, South Korea.
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11
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Zhan T, Lv W, Deng Y. Multilayer gyroid cubic membrane organization in green alga Zygnema. PROTOPLASMA 2017; 254:1923-1930. [PMID: 28176001 DOI: 10.1007/s00709-017-1083-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 01/25/2017] [Indexed: 05/26/2023]
Abstract
Biological cubic membranes (CM), which are fluid membranes draped onto the 3D periodic parallel surface geometries with cubic symmetry, have been observed within subcellular organelles, including mitochondria, endoplasmic reticulum, and thylakoids. CM transition tends to occur under various stress conditions; however, multilayer CM organizations often appear associated with light stress conditions. This report is about the characterization of a projected gyroid CM in a transmission electron microscopy study of the chloroplast membranes within green alga Zygnema (LB923) whose lamellar form of thylakoid membrane started to fold into multilayer gyroid CM in the culture at the end of log phase of cell growth. Using the techniques of computer simulation of transmission electron microscopy (TEM) and a direct template matching method, we show that these CM are based on the gyroid parallel surfaces. The single, double, and multilayer gyroid CM morphologies are observed in which space is continuously divided into two, three, and more subvolumes by either one, two, or several parallel membranes. The gyroid CM are continuous with varying amount of pseudo-grana with lamellar-like morphology. The relative amount and order of these two membrane morphologies seem to vary with the age of cell culture and are insensitive to ambient light condition. In addition, thylakoid gyroid CM continuously interpenetrates the pyrenoid body through stalk, bundle-like, morphologies. Inside the pyrenoid body, the membranes re-folded into gyroid CM. The appearance of these CM rearrangements due to the consequence of Zygnema cell response to various types of environmental stresses will be discussed. These stresses include nutrient limitation, temperature fluctuation, and ultraviolet (UV) exposure.
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Affiliation(s)
- Ting Zhan
- Institute of Biomaterials and Engineering, Wenzhou Medical University, Zhejiang, 325035, People's Republic of China
- Wenzhou Institute of Biomaterials and Engineering, CNITECH, Chinese Academy of Sciences, Zhejiang, 325001, People's Republic of China
| | - Wenhua Lv
- Wenzhou Institute of Biomaterials and Engineering, CNITECH, Chinese Academy of Sciences, Zhejiang, 325001, People's Republic of China
| | - Yuru Deng
- Institute of Biomaterials and Engineering, Wenzhou Medical University, Zhejiang, 325035, People's Republic of China.
- Wenzhou Institute of Biomaterials and Engineering, CNITECH, Chinese Academy of Sciences, Zhejiang, 325001, People's Republic of China.
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12
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Knabe W, Washausen S. Early development of the nervous system of the eutherian <i>Tupaia belangeri</i>. Primate Biol 2015. [DOI: 10.5194/pb-2-25-2015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Abstract. The longstanding debate on the taxonomic status of Tupaia belangeri (Tupaiidae, Scandentia, Mammalia) has persisted in times of molecular biology and genetics. But way beyond that Tupaia belangeri has turned out to be a valuable and widely accepted animal model for studies in neurobiology, stress research, and virology, among other topics. It is thus a privilege to have the opportunity to provide an overview on selected aspects of neural development and neuroanatomy in Tupaia belangeri on the occasion of this special issue dedicated to Hans-Jürg Kuhn. Firstly, emphasis will be given to the optic system. We report rather "unconventional" findings on the morphogenesis of photoreceptor cells, and on the presence of capillary-contacting neurons in the tree shrew retina. Thereafter, network formation among directionally selective retinal neurons and optic chiasm development are discussed. We then address the main and accessory olfactory systems, the terminal nerve, the pituitary gland, and the cerebellum of Tupaia belangeri. Finally, we demonstrate how innovative 3-D reconstruction techniques helped to decipher and interpret so-far-undescribed, strictly spatiotemporally regulated waves of apoptosis and proliferation which pass through the early developing forebrain and eyes, midbrain and hindbrain, and through the panplacodal primordium which gives rise to all ectodermal placodes. Based on examples, this paper additionally wants to show how findings gained from the reported projects have influenced current neuroembryological and, at least partly, medical research.
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Angelova A, Angelov B, Mutafchieva R, Lesieur S. Biocompatible Mesoporous and Soft Nanoarchitectures. J Inorg Organomet Polym Mater 2014. [DOI: 10.1007/s10904-014-0143-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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14
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Angelov B, Angelova A, Filippov SK, Drechsler M, Štěpánek P, Lesieur S. Multicompartment lipid cubic nanoparticles with high protein upload: millisecond dynamics of formation. ACS NANO 2014; 8:5216-26. [PMID: 24742149 DOI: 10.1021/nn5012946] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Membrane shapes, produced by dynamically assembled lipid/protein architectures, are crucial for both physiological functions and the design of therapeutic nanotechnologies. Here we investigate the dynamics of lipid membrane-neurotrophic BDNF protein complexes formation and ordering in nanoparticles, with the purpose of innovation in nanostructure-based neuroprotection and biomimetic nanoarchitectonics. The kinetic pathway of membrane states associated with rapidly occurring nonequilibrium self-assembled lipid/protein nanoarchitectures was determined by millisecond time-resolved small-angle X-ray scattering (SAXS) at high resolution. The neurotrophin binding and millisecond trafficking along the flexible membranes induced an unusual overlay of channel-network architectures including two coexisting cubic lattices epitaxially connected to lamellar membrane stacks. These time-resolved membrane processes, involving intercalation of discrete stiff proteins in continuous soft membranes, evidence stepwise curvature control mechanisms. The obtained three-phase liquid-crystalline nanoparticles of neurotrophic composition put forward important advancements in multicompartment soft-matter nanostructure design.
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Affiliation(s)
- Borislav Angelov
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky Sq. 2, CZ-16206 Prague, Czech Republic
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Saba M, Wilts BD, Hielscher J, Schröder-Turk GE. Absence of Circular Polarisation in Reflections of Butterfly Wing Scales with Chiral Gyroid Structure. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.matpr.2014.09.023] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Design and Applications of Multiscale Organic–Inorganic Hybrid Materials Derived from Block Copolymer Self-Assembly. ADVANCES IN POLYMER SCIENCE 2013. [DOI: 10.1007/12_2013_246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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Tschierske C. Entwicklung struktureller Komplexität durch Selbstorganisation in flüssigkristallinen Systemen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201300872] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Tschierske C. Development of structural complexity by liquid-crystal self-assembly. Angew Chem Int Ed Engl 2013; 52:8828-78. [PMID: 23934786 DOI: 10.1002/anie.201300872] [Citation(s) in RCA: 354] [Impact Index Per Article: 32.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Indexed: 11/09/2022]
Abstract
Since the discovery of the liquid-crystalline state of matter 125 years ago, this field has developed into a scientific area with many facets. This Review presents recent developments in the molecular design and self-assembly of liquid crystals. The focus is on new exciting soft-matter structures distinct from the usually observed nematic, smectic, and columnar phases. These new structures have enhanced complexity, including multicompartment and cellular structures, periodic and quasiperiodic arrays of spheres, and new emergent properties, such as ferroelctricity and spontaneous achiral symmetry-breaking. Comparisons are made with developments in related fields, such as self-assembled monolayers, multiblock copolymers, and nanoparticle arrays. Measures of structural complexity used herein are the size of the lattice, the number of distinct compartments, the dimensionality, and the logic depth of the resulting supramolecular structures.
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Affiliation(s)
- Carsten Tschierske
- Institut für Chemie, Organische Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle Saale, Germany.
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Hyde ST, Schröder-Turk GE. Geometry of interfaces: topological complexity in biology and materials. Interface Focus 2012. [DOI: 10.1098/rsfs.2012.0035] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Stephen T. Hyde
- Department of Applied Mathematics, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - Gerd E. Schröder-Turk
- Theoretische Physik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7B, 91058 Erlangen, Germany
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