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Full-Text Articles in Life Sciences
The Occurrence Of Fish Remains In Modern Lake Systems : A Test Of The Stratified-Lake Mode, Douglas R. Britton
The Occurrence Of Fish Remains In Modern Lake Systems : A Test Of The Stratified-Lake Mode, Douglas R. Britton
Loma Linda University Electronic Theses, Dissertations & Projects
Theories regarding the taphonomy of fishes in lacustrine environments have traditionally relied on an anoxic water column to explain the excellent preservation. This concept has never been directly tested in modern lacustrine environments that are thought to be analogous to the lacustrine environments predicted by the Stratified-lake Model. This research tested that model by searching for fish remains in 38 collected bottom samples of six modern lacustrine analogues, including Fayetteville Green Lake, New York. The bottom sediments of a warm, holomictic, shallow, and saline lake (Salton Sea, California) were also examined. Although laminated sediments were found in all of the …
The Neural Organization Of The Lamina Ganglionaris In The Crab Hemigrapsus Nudus A Light And Electron Microscope Study, Hsu-Cheng Huang
The Neural Organization Of The Lamina Ganglionaris In The Crab Hemigrapsus Nudus A Light And Electron Microscope Study, Hsu-Cheng Huang
Loma Linda University Electronic Theses, Dissertations & Projects
The gross structure and the neural arrangements in the optic lamina of crab Hemigrapsus nudus have been studied by light microscopy Golgi techniques and by electron microscopy. The lamina from distal to proximal is composed of a distinct cell layer, a fibular synaptic region, the plexiform layer, a spares cell layer, and the first optic chiasma. Golgi preparation of the lamina reveal four types of cells contributing to the lamina synaptic layer. Retinula cell axons and terminations, monopolar neurons with perikarya in the distal cell layer, tangential cells, neurons whose primary process enters from the chiasma with secondary processes branching …
A Light And Electron Microscopic Study Of Visual Neurons In The Medulla Externa Of The Crab Hemigrapsus Nudus, Yu Cheng Liao
A Light And Electron Microscopic Study Of Visual Neurons In The Medulla Externa Of The Crab Hemigrapsus Nudus, Yu Cheng Liao
Loma Linda University Electronic Theses, Dissertations & Projects
The decapod crustacean with a relatively well-defined visual system have contributed significantly to our understanding of visual neuron morphology and physiology. The general morphology of the optic lobes of several decapods were initially described by Parker (1897) and Hanstrom (1924). In the past few years, several light and electron microscope studies have been made on the lamina ganglionaris: the first optic ganglion, of the lobster (Hamori and Horridge, 1966a); the crayfish (Hafner, 1974; Nassel, 1976a), and the crab (Stowe et al., 1977; Rafuse et al., in preparation). As yet, no adequate description has been made of the visual neurons in …