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1.
On the occurrence and significance of annulate lamellae in gastrodermal cells of regenerating planarians.
Coward, S J.
Cell Biol Int Rep ; 3(2): 101-6, 1979 Mar.
Article in English | MEDLINE | ID: mdl-455490

ABSTRACT

Cytoplasmic annulate lamellae have been observed to occur only in a subset of the gastrodermal cell population of regenerating planarians. They have not been found in the gastrodermal cells of intact, non-injured worms, nor in any other somatic cell type. These observations plus the presence of numerous chromatoid bodies in the same cells are consistent with the hypothesis that these cells are altering their state of differentiation and are preparing for division. It is further suggested that these cells are the precursors to the definitive somatic stem cells, the beta cells.


Subject(s)
Digestive System/ultrastructure , Planarians/anatomy & histology , Turbellaria/anatomy & histology , Animals , Cell Differentiation , Cytoplasm/ultrastructure , Digestive System/cytology , Organoids/ultrastructure , Planarians/physiology , Regeneration
2.
Fine structure studies on the planarian, Dugesia. I. Nature of the "neoblast" and other cell types in noninjured worms.
Hay, E D; Coward, S J.
J Ultrastruct Res ; 50(1): 1-21, 1975 Jan.
Article in English | MEDLINE | ID: mdl-1113364

Subject(s)
Planarians/ultrastructure , Turbellaria/ultrastructure , Animals , Cell Count , Cell Differentiation , Microscopy, Electron , Mitosis , Muscles/cytology , Muscles/ultrastructure , Planarians/cytology , Skin/ultrastructure
3.
Chromatoid bodies in somatic cells of the planarian: observations on their behavior during mitosis.
Coward, S J.
Anat Rec ; 180(3): 533-45, 1974 Nov.
Article in English | MEDLINE | ID: mdl-4371241

Subject(s)
Inclusion Bodies , Mitosis , Animals , Cell Membrane/ultrastructure , Cell Nucleus/ultrastructure , Chromatin , Chromosomes/ultrastructure , Cytoplasm/ultrastructure , Inclusion Bodies/ultrastructure , Microscopy, Electron , Microtubules/ultrastructure , Mitochondria/ultrastructure , Planarians/cytology
4.
Lysosomes and lysosomal enzyme activity in the regenerating planarian; evidence in support of dedifferentiation.
Coward, S J; Bennett, C E; Hazlehurst, B L.
J Exp Zool ; 189(2): 133-46, 1974 Aug.
Article in English | MEDLINE | ID: mdl-4853064

Subject(s)
Acid Phosphatase/analysis , Cell Differentiation , Lysosomes/enzymology , Regeneration , Turbellaria/physiology , Animals , Histocytochemistry , Microscopy, Electron , Spectrophotometry , Turbellaria/cytology , Turbellaria/enzymology
5.
On the minimal size of a planarian capable of regeneration.
Montgomery, J R; Coward, S J.
Trans Am Microsc Soc ; 93(3): 386-91, 1974 Jul.
Article in English | MEDLINE | ID: mdl-4853459

Subject(s)
Regeneration , Turbellaria/physiology , Animals , Culture Media , Morphogenesis
6.
Nihilistic effect of 2 positive chemical stimuli.
Coward, S J; Johannes, R E.
Naturwissenschaften ; 56(4): 217, 1969 Apr.
Article in English | MEDLINE | ID: mdl-5360108

Subject(s)
Behavior, Animal/drug effects , Chemotaxis , Glutamine/pharmacology , Lysine/pharmacology , Turbellaria/drug effects , Animals , Drug Synergism , Stimulation, Chemical
7.
The relation of surface and volume to so-called physiological gradients in planaria.
Coward, S J.
Dev Biol ; 18(6): 590-601, 1968 Dec.
Article in English | MEDLINE | ID: mdl-5710081

Subject(s)
Turbellaria/metabolism , Amino Acids/metabolism , Carbon Isotopes , Permeability , Protein Biosynthesis , Regeneration , Surface Properties , Turbellaria/growth & development , Turbellaria/physiology
8.
Effects of actinomycin D on regeneration give evidence of sequential gene activation.
Coward, S J.
Nature ; 219(5160): 1257-8, 1968 Sep 21.
Article in English | MEDLINE | ID: mdl-4971121

Subject(s)
Dactinomycin/pharmacology , Genes , Regeneration/drug effects , Animals , Cell Differentiation , Eye Abnormalities , Heart Atria/embryology , Turbellaria
9.
The equivalence of DNA from developing frog embryos.
Coward, S J; Rollins, E; Flickinger, R A.
Exp Cell Res ; 42(1): 42-9, 1966 Apr.
Article in English | MEDLINE | ID: mdl-5929572

Subject(s)
DNA , Embryo, Nonmammalian/metabolism , Adenine Nucleotides/metabolism , Animals , Anura , Cytosine Nucleotides/metabolism , Guanine Nucleotides/metabolism , In Vitro Techniques , Liver , Micrococcus , Nucleotidyltransferases , Proteins/metabolism , RNA/biosynthesis , Ribonucleases , Temperature , Ultracentrifugation , Uracil Nucleotides/metabolism
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