发表机构
Smithsonian Astrophysical Observatory Center for Astrophysics | Harvard & Smithsonian; PLEX Corporation（史密森尼天体物理台哈佛与史密森中心; PLEX公司）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出太空来源的甘氨酸聚合物 Hemoglycin 通过铁硅晶格及二价阳离子分布编码信息，其低能钙取代态可维持长期化学修饰，作为永久记忆候选材料。
AI 中文摘要
源自太空的甘氨酸聚合物 Hemoglycin 以铁和硅为端基，形成具有高密度硅四面体顶点的三维规则晶格。二价阳离子桥绕过顶点，促进电子沿晶格轴向逐层传导。原则上，每个顶点周围镁或钙离子的精确分布可以编码大量信息。在聚合物形成于分子云中的太空环境中，由光子输入产生的电流会逐渐衰减，但在宜居行星（如地球）上的生命形式中，落入的 Hemoglycin 可被封闭在神经系统神经元或胶质细胞的脂质电子屏障之后。对镁或钙占据排列的能量最小化计算显示，钙主导构型的结合更深。一个具有两次独立镁到钙取代的低能态似乎是维持长期化学修饰的关键。该状态可通过脉冲序列读取，该脉冲序列诱导匹配的钙空间分布，使相邻的绝缘晶格区域变得导电，并提供完整的传导路径，从而发出识别信号。信息的写入可能涉及脂质膜内钠/钙交换体的空间调节。
英文摘要
The Hemoglycin polymer of glycine derived from space is terminated by iron and silicon to form a three-dimensional regular lattice with a high density of silicon tetrahedral vertices. Divalent cation bridges bypass vertices to facilitate electron conduction axially from layer to layer of the lattice. In principle, the exact distribution of Mg or Ca ions around each vertex can encode a very large amount of information. In space where the polymer forms in a molecular cloud the current derived from photon input will fade but in-fall hemoglycin in life forms on habitable planets like Earth, could be contained behind lipid electronic barriers of the nervous system in neurons or glia. Energy minimization of the permutations for magnesium or calcium occupancy showed deeper binding for calcium-dominated configurations. A low energy state with two independent magnesium to calcium substitutions appears to be key to the maintenance of long-term chemical modification. This state could be read via a pulse train that induced the matching spatial distribution of calcium to render adjacent insulating lattice regions conductive and provide a completed conduction path, signaling recognition. Writing of information may involve spatial modulation of the Na/Ca exchanger within the lipid membrane.
Comments17 pages,9 Figures, 1 Table
