Bedford College

About: Bedford College is a education organization based out in Bedford, United Kingdom. It is known for research contribution in the topics: Sieve tube element & Metamorphism. The organization has 656 authors who have published 839 publications receiving 25538 citations.

A study of the yellow astaxanthin-proteins of lobster carapace

Abstract: 1. 1. Astaxanthin-proteins absorbing in the 400 nm region, larger in size than yellow pigment (λmax 409 nm), are present in extracts of lobster carapace. The subunits of the pigments are of the same size as those of the blue pigment, α-crustacyanin. 2. 2. The subunit composition of yellow pigment (λmax 409 nm), is studied. The pigment is polydisperse in electrophoresis and is composed of two different types of subunit, one type of which is common to α-crustacyanin.

Frost Action in Superficial Deposits, Iceland

Abstract: The object of this article is to draw attention to the patterns found in surface deposits of Iceland which are attributable to frost action and alternating frost and thaw, and to point out that such structures may be preserved in sediments, as valuable indicators of ancient climates.

Hypothalamo-hypophyseal system in the minnow, Phoxinus phoxinus L. with a note on the effects of hypophysectomy.

Abstract: The developmental differentiation of the hypothalamo-hypophyseal system and its disposition in the adult normal minnow is described. Neurosecretory stainable material is present either as granules or droplets in the nucleus preopticus and it is suggested that they are related with one another and follow a sequence in their developmental appearance. This differentiation of the neuorsecretory material and its distribution along the preoptico-hypophyseal tract suggests a strong basis in support of the “transport-hypothesis” of Bargmann and Scharrer ('51). The presences of the Herring bodies and peripheral movement of the neurosecretory material along the axon is suggestive of the functional role performed by the tract in the process of storage and release of hormone into the circulation. The presence of intrathalamic branches of the optic nerve and their close association with neurosecretory fibers of the tract seem to be of significance in the important problem of retina-pituitary relationship. Injections of synthetic oxytocin, synthetic lysine vasopressin and a suspension of acetone-dried hypothalmus containing nucleus preopticus and the neurosecretory material have no effect on the color response in the minnow. The effect of hypophysectomy clearly confirms that the axons of the nucleus preopticus pass down to the neurohypophysis. After severe operational interruptions of the fibers, their trophic centers (the cell bodies of the nucleus preopticus) degenerate. The accumulation of the neurosecretory material in the stalk region after hypophysectomy supports the “transport-hypothesis.”