Magnetic properties of tunicate blood cells. I. Ascidia nigra.
Magnetic properties of tunicate blood cells. I. Ascidia nigra.
复制标题
被囊动物血细胞的磁性。
DOI：
10.1016/0162-0134(88)80048-5
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发表时间：
1988
影响因子：
3.9
通讯作者：
Spartalian,K
中科院分区：
文献类型：
--
作者：
Lee,S;Kustin,K;Robinson,WE;Frankel,RB;Spartalian,K
完整的和冷冻干燥的血细胞的被囊海鞘黑和模型钒（III）和（IV）化合物作为多晶固体和在水溶液中的磁性已被测量到50千奥斯特与SQUID磁强计。从数据的温度依赖性中提取了样品抗磁性的校正，而没有任何进一步的假设。对于钒（IV），在2-100 K的温度范围内的不同值的施加磁场的磁矩的测量值服从布里渊函数与自旋1 - 2。对于钒（III），磁矩数据不服从布里渊函数，并根据S= 1的自旋哈密顿量进行分析。全血和冻干血样的测量结果与钒（III）的主要物种一致。这些结果进行了讨论的机制，钒积累和使用钒的氧化态作为标准的海鞘分类。
The magnetic properties of intact and freeze-dried blood cells of the tunicate Ascidia nigra and of model vanadium (III) and (IV) compounds as polycrystalline solids and in aqueous solution have been measured up to 50 kOe with a SQUID susceptometer. Corrections for the samples' diamagnetism were extracted from the temperature dependence of the data without any further assumptions. For vanadium (IV), measured values of the magnetic moment at different values of the applied magnetic field over the temperature range 2–100 K obey a Brillouin function with spin 1 2. For vanadium (III), the magnetic moment data did not obey a Brillouin function and were analyzed in terms of a spin Hamiltonian with S= 1. Measurements on both whole and freeze-dried blood samples give consistent results with vanadium (III) the predominant species. These results are discussed in terms of the mechanisms of vanadium accumulation and the use of vanadium oxidation states as criteria of ascidian taxonomy.