Stumpf H F
I. Zoologisches Institut der Universität Göttingen, Deutschland.
Wilhelm Roux Arch Entwickl Mech Org. 1967 Sep;158(3):315-330. doi: 10.1007/BF00573402.
Evidence for the existence of a concentration gradient in the segments ofGalleria mellonella and ofRhodnius prolixus has been reported elsewhere. InGalleria it is possible to determine the functional form of the gradient by measuring the deviation of the scales from their normal direction after the transplantation of a piece of the intersegmental integument from the anterior or the posterior margin into the segment. The calculated values indicate the "force" with which the scales are oriented in an axial direction. This "force" corresponds to the slope of the concentration gradient.Different curves are found for the forces depending on the origin of the graft (anterior or posterior margin). This seems to be the result of unequal shrinking of the grafts. The geometrical mean of the average of the forces for anterior grafts and that for posterior grafts is nearly constant all over the segment (only the parts near the segment margins could not be included in the measurement). Thus the concentration gradient declines almost linearly. Linearly declining concentrations are expected between two different but constant concentrations which may be assumed to be located in the anterior and the posterior margin of the segment.
蜡螟（Galleria mellonella）和南美锥蝽（Rhodnius prolixus）各体节中存在浓度梯度的证据已在其他地方报道过。在蜡螟中，可以通过测量将一段节间体壁从前缘或后缘移植到体节后鳞片偏离其正常方向的程度来确定梯度的函数形式。计算值表明鳞片沿轴向排列的“力”。这个“力”对应于浓度梯度的斜率。根据移植片的来源（前缘或后缘），发现力的曲线不同。这似乎是移植片收缩不均的结果。前移植片和后移植片力的平均值的几何平均值在整个体节中几乎是恒定的（仅体节边缘附近的部分未包含在测量中）。因此，浓度梯度几乎呈线性下降。在两个不同但恒定的浓度之间预计会有线性下降的浓度，这两个浓度可假定位于体节的前缘和后缘。
