Observations on the blood of Certain Ascidians, with Special Reference to the Biochemistry of Vanadium
Observations on the blood of Certain Ascidians, with Special Reference to the Biochemistry of Vanadium
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对某些海鞘类血液的观察，特别是钒的生物化学
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发表时间：
1939
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影响因子：
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通讯作者：
D. A. Webb
中科院分区：
文献类型：
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作者：
D. A. Webb
本文根据Henze所描述的钒色原的存在，对海鞘科几种海鞘的血液进行了检查，并结合其他作者提供的数据对结果进行了讨论。色原总是和硫酸一起包含在一种特殊类型的细胞中，称为钒细胞。这些钒只在hcidiidae和Perophoridae中发现，尽管某些其他家族的成员含有其他形式的钒。还讨论了硫酸在血液和试验的泡状细胞中的组内分布。没有理由认为海鞘的色素，除了色原本身，是钒化合物。本文描述了一种奇特的从海鞘的橙子色素细胞中分离出的细胞内含物。提出了钒色原不是呼吸色素的实验证据和理论依据。它不是蛋白质或卟啉化合物，但似乎由钒与吡咯环的直链复合物组成，可能与胆色素相当。海水似乎可能提供了足够丰富的钒源来解释吸收的量。这些事实的系统发育方面被认为是与贝里尔最近的分类海鞘。钒的存在是一种原始的特征，在更专门的家族中已经消失了。
The blood of a number of species of Ascidiacea has been examined with reference to the presence of the vanadium chromogen described by Henze, and the results are discussed in connexion with the data available from other authors. The chromogen is always contained, together with sulphuric acid, in a special type of cell described as a vanadocyte. These are found only in the hcidiidae and Perophoridae, though members of certain other families contain vanadium in some other form. The distribution within the group of sulphuric acid in vesicular cells of the blood and test is also discussed. There is no reason to suppose that the pigments of Ascidians, other than the chromogen itself, are vanadium compounds. A curious type of cell inclusion from the orange pigment cells of Ascidia mentula is described. Experimental evidence and theoretical considerations are brought forward to show that the vanadium chromogen is not in any sense a respiratory pigment. At present no function can be ascribed to it. I t is not a protein or porphyrin compound, but seems to consist of vanadium in association with a straight chain complex of pyrrol rings, comparable perhaps to a bile pigment. It seems possible that sea water provides a sufficiently rich source of vanadium to account for the amounts absorbed. The phylogenetic aspects of these facts are considered in relation to Berrill9s recentre-classification of the Ascidiacea. The presence of vanadium is a primitive character which has been lost in the more specialized families.