✦ LIBER ✦

Proportioning and regeneration in fissioned and unfissioned individuals of the planarianDugesia tigrina

✍ Scribed by Mead, Robert W.

Publisher: John Wiley and Sons
Year: 1985
Tongue: English
Weight: 773 KB
Volume: 235
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402350107

No coin nor oath required. For personal study only.

✦ Synopsis

Regeneration was examined in fissioned and unfssioned planarians (Dugesia tigrina) in terms of regenerative success and body proportioning. Regenerative success was determined in terms of percent of abnormal regenerates and number of abnormalities per abnormal regenerate. Sections from unfissioned animals were less successful at regeneration than were those from fissioned animals, and body regions located immediately behind the pharynx represented those segments which formed fewer abnormal regenerates as a result of fissioning. Body proportioning was measured as a function of size of head and prepharygeal region to overall body length. A direct correlation was seen in the proportional size of these two parameters, which varied significantly among regenerates. Results suggest that body proportioning is not constant from one excised piece to another but is predictable and dependent on several variables including interval between fission and sectioning, region from which the segment was obtained, andor original length of the segment.

📜 SIMILAR VOLUMES

Proportioning of body regions in the pla

Proportioning of body regions in the planarianDugesia tigrina as a function of the length: Width ratio of the regenerating fragment

✍ Mead, Robert W. 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 877 KB

## Abstract Regeneration was examined in different regions of planaria __(Dugesia tigrina)__ in order to determine the effect that the shape of a section exerts on proportion regulation during regeneration. Length: width ratios were used as an index of section shape and experiments utilized section

Stimulation of cellular proliferation an

Stimulation of cellular proliferation and differentiation in the intact and regenerating planarianDugesia(G) tigrina by the neuropeptide substance P

✍ Saló, Emili ;Baguñà, Jaume 📂 Article 📅 1986 🏛 John Wiley and Sons 🌐 English ⚖ 635 KB

The neuropeptide substance P (SP) is shown to be a potent mitogen for intact and regenerating planarians. At nanomolar concentrations, SP markedly enhances cellular proliferation causing an increase in the mitotic index and in the number of blastema cells. Moreover, albeit to a lower extent,

Abnormal regeneration in the planarianDu

Abnormal regeneration in the planarianDugesia tigrina as a function of the length: Width ratio of the regenerating fragment

✍ Mead, Robert W. ;Krump, Martha A. 📂 Article 📅 1986 🏛 John Wiley and Sons 🌐 English ⚖ 900 KB

Effect of weak static and low-frequency

Effect of weak static and low-frequency alternating magnetic fields on the fission and regeneration of the planarian dugesia (Girardia) tigrina

✍ Vadim V. Novikov; Inna M. Sheiman; Evgeny E. Fesenko 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 129 KB 👁 2 views

## Abstract The effect of weak static (DC) and alternating (AC) magnetic fields (MFs), as well as combined (AC/DC) collinear MFs on the intensity of morphogenesis processes in the planarian __Dugesia (Girardia) tigrina__ has been studied. It was found that combined MFs produce a stimulating effect

Influence of the nutritional state on re

Influence of the nutritional state on repeated head regeneration, growth, and fission in the planarian,Dugesia dorotocephala

✍ Nentwig, M. Ruth ;Schauble, Muriel K. 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 641 KB

## Abstract Starved and fed animals were repeatedly decapitated to determine the influence of nutritional state on regeneration rate and capacity, growth in length, fission, and formation of abnormal heads in __Dugesia dorotocephala__. Animals fed at the end of each regenerative period were able to

Can differences in limb regeneration abi

Can differences in limb regeneration ability between individuals within certain amphibian species be explained by differences in the quantity of innervation?

✍ Scadding, Steven R. 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 English ⚖ 557 KB

## Abstract In some species of amphibians, the regenerative response to limb amputation is not uniform. For example, regenerative ability varies from one individual to another within the species __Xenopus laevis, Ambystoma maculatum__, and __Amphiuma tridactylum__. In many species, limb regenerativ