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Articles 1 - 30 of 62
Full-Text Articles in Life Sciences
Nuclear Behavior During Morphogenesis In Vaucheria, Donald Ott
Nuclear Behavior During Morphogenesis In Vaucheria, Donald Ott
Donald W. Ott
No abstract provided.
The Gallbladder Of Uranoscopus Scaber L. (Teleost Perciform Fish) Is Lined By Specialized Cholecystocytes, Donald Ott, J Gilloteaux, Carla Oldham-Ott
The Gallbladder Of Uranoscopus Scaber L. (Teleost Perciform Fish) Is Lined By Specialized Cholecystocytes, Donald Ott, J Gilloteaux, Carla Oldham-Ott
Donald W. Ott
The gallbladder of Uranoscopus exhibits a mucosal surface layer of simple columnar epithelium composed of specialized cholecystocytes. The apices show storage and mucous secretions, typical microvilli, and very apical projections extending deep into the luminal contents. Many organelles and heterogeneous vesicles of diverse size fill the cytoplasm, including neutral mucins, mitochondria, peroxisomes, lysosomal bodies, and lipid-rich deposits with cholesterol inclusions. The fibromuscular layer shows little blood supply and contains scattered lymph-like walls with minute cholesterol inclusions. The remaining muscular, subserosal, and serosal or adventitial layers of this species do not show any histologic differences to those of other vertebrates. It …
Oogenesis In Vaucheria Fontinalis (L.) Christensen, Donald Ott
Oogenesis In Vaucheria Fontinalis (L.) Christensen, Donald Ott
Donald W. Ott
No abstract provided.
The Identification Of A Fine Microfilament Network Using Rodamine Phalloidin In Vaucheria Longicaulis, Donald Ott
The Identification Of A Fine Microfilament Network Using Rodamine Phalloidin In Vaucheria Longicaulis, Donald Ott
Donald W. Ott
No abstract provided.
Fluorescence Studies Of Nuclear Behavior During Zoosporogensis In Vaucheria, Donald Ott
Fluorescence Studies Of Nuclear Behavior During Zoosporogensis In Vaucheria, Donald Ott
Donald W. Ott
No abstract provided.
Nuclear Cyclosis In Vaucheria. Optical Approaches To The Dynamics Of Cellular Motility Symposium, Donald Ott
Nuclear Cyclosis In Vaucheria. Optical Approaches To The Dynamics Of Cellular Motility Symposium, Donald Ott
Donald W. Ott
No abstract provided.
Ultrastructure Of Diplonema Ambulator Larsen & Patterson (Euglenozoa) And Its Relationship To Isonema, Donald Ott
Ultrastructure Of Diplonema Ambulator Larsen & Patterson (Euglenozoa) And Its Relationship To Isonema, Donald Ott
Donald W. Ott
The fine structure of a small phagotrophic protist, Diplonema ambulator, associated with deteriorating leaves of some species of the common fresh-water aquarium plant, Cryptocoryne is described. The organisms bear two short flagella which arise subapically and have a flexible cell surface often exhibiting pronounced changes in shape. Under the plasma membrane is a single layer of interconnected microtubules. Adjacent to the microtubules is a peripheral reticulate mitochondrion with plate-like cristae and numerous dense beaded inclusions. A large complex microtubular-based feeding apparatus extending to the cell surface is surrounded by several food vacuoles. Because the organism fits the light microscopic description …
Eustigmatophyceae, Raphidophyceae, And Tribophyceae, Donald Ott
Eustigmatophyceae, Raphidophyceae, And Tribophyceae, Donald Ott
Donald W. Ott
No abstract provided.
Androdioecy And Hermaphroditism In Five Species Of Clam Shrimp (Crustacea: Branchiopoda: Spinicaudata) From India And Thailand, Donald Ott, Stephen Weeks, Robert Duff, Justin Brantner
Androdioecy And Hermaphroditism In Five Species Of Clam Shrimp (Crustacea: Branchiopoda: Spinicaudata) From India And Thailand, Donald Ott, Stephen Weeks, Robert Duff, Justin Brantner
Donald W. Ott
Crustaceans in the order Spinicaudata display a broad range of reproductive strategies, ranging from pure hermaphroditism to pure dioecy (separate males and females), and intermediate combinations. One particularly interesting genus of these “clam shrimps” is Eulimnadia. Based on offspring sex ratios, it has been suggested that all members of the genus are androdioecious: populations consist of mixtures of males and hermaphrodites. However, only two of the ~40 species in this genus have been examined histologically to confirm the presence of ovotestes in the purported hermaphrodites of this group. Here, we report both sex ratio and histological evidence showing that populations …
Developmental Cytology Of The Genus Vaucheria Iv. Spermatogenesis, Donald Ott, R Brown
Developmental Cytology Of The Genus Vaucheria Iv. Spermatogenesis, Donald Ott, R Brown
Donald W. Ott
Spermatogenesis among several species of Vaucheria has been examined in sections prepared for light and electron microscopy. Early developmental stages of zoosporogenesis and spermatogenesis are identical; however, cytoplasmic cleavage progresses to completion in the antheridium, while incipient cleavage is rudimentary in the zoosporangium. During morphogenesis of the antheridium, nuclear cyclosis is inhibited and flagella develop from nucleusassociated basal bodies. The flagella project into internal membrane reservoirs (termed flagellar pools) which, unlike their counterparts in zoosporogenesis, fail to migrate to the surface of the antheridium, while chloroplasts are excluded from uninucleate protoplasmic segments by completion of cleavage furrow development.
Microscopic Observation Of Filter Cake Formation, Donald Ott, G Chase, J Steffen
Microscopic Observation Of Filter Cake Formation, Donald Ott, G Chase, J Steffen
Donald W. Ott
Particle collisions and filter cake collapse are observed through a microscope during the formation of filter cakes. Cake filtration is widely applied throughout industry for fluid-particle separations. Models and theories have been developed to describe and predict filter cake performance, but there is little literature on direct observation of particle packing and cake formation. A filter assembly the size of a microscope slide is placed on the microscope such that the slurry flow and cake formation is across the field of view. The cake formation is recorded on video tape. Photographs of the video image show particles in the slurry …
Vegetative Reduction In Epiphytic Bromeliaceae And Orchidaceae: Its Origin And Significance, Donald Ott, D Benzing
Vegetative Reduction In Epiphytic Bromeliaceae And Orchidaceae: Its Origin And Significance, Donald Ott, D Benzing
Donald W. Ott
Assays of the roots and leaves of nine leafy and three "shootless" orchids indicated that the roots of the latter, as well as those of leafy Kingidium taeniale, engaged in CAM metabolism and possessed relatively high chlorophyll contents. All leaves were similar on both counts. Except for those of K. taeniale, the roots of the leafy orchids assayed were pale green and incapable of exhibiting a net carbon gain during day or night runs. A labeling experiment with leafy Encyclia tampensis indicated that its green roots did fix small quantities of carbon dioxide and that some of the product was …
Fluorescence Studies Of Nuclear And Mitochondrial Behavior During Oogensis In Vaucheria Aversa, Donald Ott
Fluorescence Studies Of Nuclear And Mitochondrial Behavior During Oogensis In Vaucheria Aversa, Donald Ott
Donald W. Ott
No abstract provided.
Bed And Breakfast: The Parasitic Life Of Proales Werneckii (Ploimida: Proalidae) Within The Alga Vaucheria (Xanthophyceae: Vaucheriales), Donald Ott, Robert Wallace, Sheri Stiles, Carla Oldham-Ott
Bed And Breakfast: The Parasitic Life Of Proales Werneckii (Ploimida: Proalidae) Within The Alga Vaucheria (Xanthophyceae: Vaucheriales), Donald Ott, Robert Wallace, Sheri Stiles, Carla Oldham-Ott
Donald W. Ott
The unusual parasitic association between Proales werneckii (Ehrenberg, 1834) (Ploimida: Proalidae) and the psychrophilic, coenocytic, filamentous alga, Vaucheria De Candolle, 1801 (Xanthophyceae: Vaucheriales), is documented using light and electron microscopy. A young female rotifer colonizes a Vaucheria filament (ca. 80 m 10 cm) by gaining entrance to the cell at a growing region where the wall has not yet matured. After achieving access to the cell, it disrupts development of either a gametophore or an apical tip by inducing cell hypertrophy and formation of an excrescent gall (ca. 80–120 140–1500 m). Remaining within the vacuole of the gall for the …
Development Of The Carposporophyte Of Kallymenia Reniformis, Donald Ott, Max Hommersand
Development Of The Carposporophyte Of Kallymenia Reniformis, Donald Ott, Max Hommersand
Donald W. Ott
The development of the carposporophyte in Kallymenia reniformis involves an elaborate series of interactions between reproductive and vegetative tissues. Following fertilization, the inner cells of the carpogonial branches form processes that unite with the supporting cell and with each other, giving rise to a large fusion cell. A number of medullary filaments are enveloped and incorporated within the developing fusion cell. Secondary filaments may be produced from medullary cells outside the fusion cell after connecting filaments have been initiated. Connecting filaments are nonseptale and wind their way through the medulla. The presence of a connecting filament in the vicinity of …
The Stabilization Of A Labile Microfilament Network In Vaucheria Employing A New Fixative, Donald Ott
The Stabilization Of A Labile Microfilament Network In Vaucheria Employing A New Fixative, Donald Ott
Donald W. Ott
No abstract provided.
Oogenesis In Vaucheria Litorea Hofman Ex. C. Agardh, Donald Ott
Oogenesis In Vaucheria Litorea Hofman Ex. C. Agardh, Donald Ott
Donald W. Ott
No abstract provided.
Interaction Of Blood With Fatiquing Substrates, Donald Ott
Interaction Of Blood With Fatiquing Substrates, Donald Ott
Donald W. Ott
No abstract provided.
Electron Microscopy Of The Mature Spermatozoids Of Vaucheria, Donald Ott
Electron Microscopy Of The Mature Spermatozoids Of Vaucheria, Donald Ott
Donald W. Ott
No abstract provided.
Nuclear Movement In Vaucheria Longicaulis, Donald Ott
Nuclear Movement In Vaucheria Longicaulis, Donald Ott
Donald W. Ott
No abstract provided.
Control Of Nuclear Movement By Microtubules In Vaucheria, Donald Ott
Control Of Nuclear Movement By Microtubules In Vaucheria, Donald Ott
Donald W. Ott
No abstract provided.
Tem Of Isolated Microtubule Bundles From Vaucheria Longicaulis, Donald Ott
Tem Of Isolated Microtubule Bundles From Vaucheria Longicaulis, Donald Ott
Donald W. Ott
No abstract provided.
Description Of An Isonema-Like Flagellate Associated With Cryptocorne Disease, Donald Ott
Description Of An Isonema-Like Flagellate Associated With Cryptocorne Disease, Donald Ott
Donald W. Ott
No abstract provided.
Comparative Studies Of Nuclear Translocation In The Vegetative Filaments Of Vaucheria, Donald Ott
Comparative Studies Of Nuclear Translocation In The Vegetative Filaments Of Vaucheria, Donald Ott
Donald W. Ott
No abstract provided.
New Records Of Vaucheria Species (Xanthophyceae) With Associated Proales Werneckii (Rotifera) From North America, Donald Ott, Robert Wallace, Morgan Vis, Robert Verb
New Records Of Vaucheria Species (Xanthophyceae) With Associated Proales Werneckii (Rotifera) From North America, Donald Ott, Robert Wallace, Morgan Vis, Robert Verb
Donald W. Ott
The presence of galls on species of Vaucheria was investigated both seasonally and in a number of locations in North America. These galls are induced by the rotifer, Proales werneckii. In an Ohio stream, Vaucheria bursata and V. geminata were found to have galls throughout their growing season; September to January. Galls were most abundant in October and ranged in size from 90–260 μm in width and 140–790 μm in length. New records of Vaucheria with galls from locations in Alabama, California, Georgia, Louisiana, North Carolina, Ohio and Tennessee are reported. Three of the five taxa collected were not previously …
Video Enhanced Microscopy Of Organellar Streaming In Vaucheria Longicaulis, Donald Ott
Video Enhanced Microscopy Of Organellar Streaming In Vaucheria Longicaulis, Donald Ott
Donald W. Ott
No abstract provided.
Midsummer Plankton Communities Of Select Ohio Wetlands, Donald Ott
Midsummer Plankton Communities Of Select Ohio Wetlands, Donald Ott
Donald W. Ott
No abstract provided.
Mitosis In Sphaeroplea, Donald Ott
The Gallbladder Of The Electric Ray Torpedo Marmorata Risso Deplays Excrescent Cholecystocytes With Merocrine And Apocrine-Like Secretions, Donald Ott, J Gilloteaux, Carla Oldham-Ott
The Gallbladder Of The Electric Ray Torpedo Marmorata Risso Deplays Excrescent Cholecystocytes With Merocrine And Apocrine-Like Secretions, Donald Ott, J Gilloteaux, Carla Oldham-Ott
Donald W. Ott
The gallbladder of Torpedo marmorata exhibits a mucosal surface layer of simple columnar epithelium with very tall cholecystocytes. The apical domain of each cell has few microvilli, but many mucous vesicles that are secreted by exocytosis at the cell apices. The apical regions may also elongate and undergo self-excision while shedding mucus and cell debris into the gallbladder lumen in a manner similar to that described in mammals as a result of sex steroid treatment to induce gallstones and to that found in the cholecystitis associated with cholelithiasis. Numerous small mitochondria, spherical to elongated, are distributed throughout the cells, while …
Cell Structure And Cell Division In Pedinomonas, Donald Ott
Cell Structure And Cell Division In Pedinomonas, Donald Ott
Donald W. Ott
No abstract provided.