宏观检测中摩尔浓度盲区的实验探究
Experimental access to molarity's blind spot in macroscopic assays
AI总结：
该研究揭示宏观检测中摩尔浓度的盲区，通过实验台兼容界面分离整体剂量与局部几何，发现微摩尔级亲和力下抑制作用由局部空间形状而非结合强度决定，为结构化空间中分子相互作用的重新测量提供了实验途径。
AI中文摘要：
化学动力学长期以来通过烧瓶与摩尔浓度的配对来推断局部分子行为，其中充分混合的浓度作为实验读数。然而许多生物反应发生在结构化环境中，研究人员早已认识到，浓度在这类环境中可能不具有相同的操作意义，但即使是有效摩尔浓度这类局部概念，通常也会将局部效应转换回单一的浓度单位值。目前缺失的是一条互补路径：一种适用于实验台的方法，可将局部结构作为实验变量，而非仅作为摩尔浓度的校正项。本文展示了一种烧瓶与摩尔浓度界面无法观测到的化学-几何交叉效应：在微摩尔或更弱的亲和力范围内，抑制作用会从熟悉的“浓度-亲和力”模式急剧切换，此时化学结合强度不再决定响应，而是由靶点的局部空间形状决定。一种适用于实验台的界面通过将整体剂量与局部几何分离，使该切换可测量。该盲区源于一个隐含前提：宏观汇聚使结构化局部状态可作为单一局部浓度读取。化学-几何交叉打破了这一前提：在结构化靶点环境中，宏观检测仍可对局部状态的概率分布敏感，因此将该分布压缩为一个浓度数值会从读数中移除几何控制轴。通过在实验中保留该轴，该界面绕过了摩尔浓度的隐藏瓶颈，为在结构化空间中重新测量和解释分子相互作用提供了常规实验途径。
英文摘要：
Chemical kinetics has long inferred local molecular behaviour through the flask-and-molarity pairing, where well-mixed concentrations serve as the experimental readout. Yet many biological reactions occur in structured environments. Researchers have long recognized that concentration may not carry the same operational meaning in such environments, but even local concepts such as effective molarity usually translate local effects back into a single value with units of concentration. What has been missing is the complementary path: a bench-compatible way to make local structure an experimental variable, rather than only a correction to molarity. Here we show a chemistry-geometry crossover that the flask-and-molarity interface could not make visible. In the micromolar-or-weaker affinity regime, inhibition can switch sharply out of the familiar concentration-and-affinity mode: chemical binding strength no longer determines the response, and the shape of the target's local space does. A bench-compatible interface made this switch measurable by separating bulk dose from local geometry. This blind spot arose from the hidden premise that macroscopic pooling makes a structured local state readable as a single local concentration. The chemistry-geometry crossover breaks that premise: in a structured target environment, a macroscopic assay can remain sensitive to the probability distribution of local states, so collapsing that distribution to one concentration-valued number removes the geometric control axis from the readout. By preserving that axis in the experiment, the interface bypasses molarity's hidden bottleneck and provides a routine experimental route to remeasure and reinterpret molecular interactions in structured space.
