Ultrastructural analysis of sporoderm development in megaspores ofSelaginella galeottii (Lycophyta)

1991 ◽  
Vol 174 (3-4) ◽  
pp. 171-182 ◽  
Author(s):  
W. A. Taylor
Keyword(s):  
Ultrastructural Analysis ◽  
Sporoderm Development

Contributions to the mechanisms of mitosis and roles of cytoplasmic microtubules from ultrastructural analyses of fungi

1978 ◽  
Vol 36 (2) ◽  
pp. 266-267
Author(s):  
I. Brent Heath
Keyword(s):  
Nuclear Envelope ◽  
Direct Application ◽  
Ultrastructural Analysis ◽  
General Interest ◽  
Research Results ◽  
Organelle Motility ◽  
Cytoplasmic Microtubules

Detailed ultrastructural analysis of fungal mitotic systems and cytoplasmic microtubules might be expected to contribute to a number of areas of general interest in addition to the direct application to the organisms of study. These areas include possibly fundamental general mechanisms of mitosis; evolution of mitosis; phylogeny of organisms; mechanisms of organelle motility and positioning; characterization of cellular aspects of microtubule properties and polymerization control features. This communication is intended to outline our current research results relating to selected parts of the above questions.Mitosis in the oomycetes Saprolegnia and Thraustotheca has been described previously. These papers described simple kinetochores and showed that the kineto- chores could probably be used as markers for the poorly defined chromosomes. Kineto- chore counts from serially sectioned prophase mitotic nuclei show that kinetochore replication precedes centriole replication to yield a single hemispherical array containing approximately the 4 n number of kinetochore microtubules diverging from the centriole associated "pocket" region of the nuclear envelope (Fig. 1).

Immunocytochemical Identification of Tubulin Containing Paracrystals in Allogromia Reticulopods

1985 ◽  
Vol 43 ◽  
pp. 486-487
Author(s):  
Gerald Rupp
Keyword(s):  
Light Microscopy ◽  
Ultrastructural Analysis ◽  
Circumstantial Evidence ◽  
Intermediate Form

The marine protozoan Allogromia sp, strain NF Lee extends an elaborate reticulopodial network (RN) which contains an elongate microtubule-(MT)-based cytoskeleton. The MTs are located primarily within cytoplasmic fibrils which are visible by light microscopy (LM) in highly flattened or “two dimensionalized” reticulopodia. It was shown previously that allogromiid RNs withdraw in response to hypertonic Mg2+-seawater. An ultrastructural analysis of this phenomenon indicated that large patches of paracrystalline (PC) material, composed of helical filament aggregates, form concomitant with a decrease in MT number. Similar large patches of PC aggregates are also found in juvenile Allogromia before they extend a RN, which disappear during RN formation. Finally, PC aggregates are occasionally seen near microtubules in normal untreated RNs. Thus there is circumstantial evidence to propose that PC aggregates in Allogromia represent an intermediate form of tubulin; however, more definitive biochemical or immunocytochemical data is not available.

Ultrastructural analysis of aminoglycoside-induced hair cell death in the zebrafish lateral line reveals an early mitochondrial response

2007 ◽  
Vol 502 (4) ◽  
pp. 522-543 ◽  
Author(s):  
Kelly N. Owens ◽  
Dale E. Cunningham ◽  
Glen Macdonald ◽  
Edwin W. Rubel ◽  
David W. Raible ◽  
...  
Keyword(s):  
Cell Death ◽  
Hair Cell ◽  
Lateral Line ◽  
Ultrastructural Analysis ◽  
Hair Cell Death
Sign in / Sign up

Export Citation Format

Share Document