HETEROGENEITY OF BRAIN OXYGENATION

由于某些未知的原因，LiPc晶体在 一些特定的条件。例如，众所周知，这些晶体 在纯净水和大脑中几个月后对氧气敏感 但在肌肉中，它们在几天内就会对氧气失去敏感性。Dr。 Sutcliffe观察到LiPc在使用时明显不稳定，但它 不清楚这是否只是由于LiPC的质量所致 他。在英国食品研究所的研究中，它是 发现了锂酞菁的氧敏性质 当放置在不同类型的 石油。因此，系统地研究了LiPc晶体的稳定性 在葵花籽油中使用了具有良好特性的LiPc。五 来自两个不同批次的晶体被放置在特氟龙试管中 装满了葵花籽油。三个晶体(来自一批)具有 在第一天和第二天，对氧气的敏感度相同 几个月后。两个LiPc晶体(来自不同的批次)只有 第一天的敏感度减半，完全没有敏感度 两个月后。这项实验表明，我们还没有完全 了解影响人民币汇率稳定的因素 LiPc晶体的氧敏特性。虽然这是 有问题，这也带来了希望，有了这样的理解，我们可能 能够进一步提高它们在肌肉等组织中的稳定性 目前，它们不能超过几天的使用。

For some unknown reasons LiPc crystals are not very stable under certain conditions. For example it is well known that these crystals are sensitive to oxygen after a few months in pure water and in brain but in a muscle lose their sensitivity to oxygen in a few days. Dr. Sutcliffe observed apparent instability of LiPc when in use but it was not clear if this was due only to the quality of the LiPc available to him. In studies at the Institute of Food Research in the U.K., it was found that the oxygen sensitive properties of lithium phthalocyanine appeared to vary more than expected when placed in different types of oils. Therefore a systematic study of the stability of LiPc crystals in sunflower oil was undertaken using well characterized LiPc. Five crystals from two different batches were placed in a Teflon tube filled with sunflower oil. Three crystals (from one batch) had the same and the usual sensitivity to oxygen on the first day and two months later. Two LiPc crystals (from a different batch) had only half of the sensitivity on the first day and no sensitivity at all after two months. This experiment indicates that we do not yet fully understand the factors which affect the stability of the oxygen-sensitive properties of LiPc crystals. While this is problematic, it also raises hope that with such understanding, we may be able to improve further their stability in tissues such as muscles where currently they cannot be used for more than a few days.