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Title: Molecular and cellular events associated with damage to rat retinal ganglion cells: Effects of brain-derived neurotrophic factor on fast axonal transport and neuronal apoptosis.
Creator: Wodarczyk, Linda, Florida Atlantic University, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
Abstract/Description: The survival of rat retinal ganglion cells (RGCs) after axotomy has been shown to be enhanced by Brain Derived Neurotrophic Factor (BDNF). It was, therefore, of interest to determine whether previously observed changes in the differential regulation of fast axonally transported proteins (FTPs) occur in rat RGCs during the early response to axotomy or whether such changes are obviated by the action of BDNF at the cell body level. It was of further interest to determine whether these...
Show moreThe survival of rat retinal ganglion cells (RGCs) after axotomy has been shown to be enhanced by Brain Derived Neurotrophic Factor (BDNF). It was, therefore, of interest to determine whether previously observed changes in the differential regulation of fast axonally transported proteins (FTPs) occur in rat RGCs during the early response to axotomy or whether such changes are obviated by the action of BDNF at the cell body level. It was of further interest to determine whether these regeneration-associated changes are sustained during the period of BDNF-enhanced cell survival. It was found that, within 2 days of injury and BDNF injection, rat RGCs initiate a growth-like cellular response that includes the differential synthesis and transport of the same profile of FTPs found to be induced in axotomized animals following injection of a saline control solution. Thus, supplementation of rat RGCs with BDNF does not obviate the changes required to reinstate active cellular regrowth. It is, therefore, unlikely that the loss of a trophic factor, such as BDNF, is the signal for axotomy-induced changes. Although a single injection of BDNF at the time of injury prolongs cell survival to at least 5 days, it is not sufficient to sustain the elevation in FTPs. This result indicates that the regulatory mechanisms that promote cell growth are distinct and separate from those that promote cell survival. This study extended beyond the above findings to affirm that apoptosis of axotomized rat RGCs is mediated by the activation of the cysteine protease, caspase-3. Such activation was demonstrated within 12 hours of axotomy and appeared to become increasingly prevalent in a central to peripheral gradient, as might be anticipated by the loss of glial derived neurotrophic support. Such activation was completely prevented by intraocular injection of BDNF, indicating that BDNF acts upstream of caspase-3 to prevent the proteolytic cascade that leads to apoptosis.
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Date Issued: 1998
PURL: http://purl.flvc.org/fcla/dt/12586
Subject Headings: Biology, Neuroscience, Biology, Cell
Format: Document (PDF)

Title: Growth dynamics of the seagrass Halophila johnsonii from a subtropical estuarine lagoon in southeastern Florida, United States of America.
Creator: Bolen, Layne Elizabeth, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: Biomass, net production, turnover, and decomposition of the seagrass Halophila johnsonii were studied in the Lake Worth Lagoon, Palm Beach County, Florida, USA. Biomass and apical meristem density averaged 8.0 g dry wt/m^2 and 1122/m^2, respectively. Mean net productivity was 0.00154 g dry wt/shoot/day or 0.45cm/shoot/day with one new leaf pair for every 0.97 cm of shoot growth. Estimated turnover time was 4.6 days. Mean weight loss in plant material was 72% after three days and 88% after...
Show moreBiomass, net production, turnover, and decomposition of the seagrass Halophila johnsonii were studied in the Lake Worth Lagoon, Palm Beach County, Florida, USA. Biomass and apical meristem density averaged 8.0 g dry wt/m^2 and 1122/m^2, respectively. Mean net productivity was 0.00154 g dry wt/shoot/day or 0.45cm/shoot/day with one new leaf pair for every 0.97 cm of shoot growth. Estimated turnover time was 4.6 days. Mean weight loss in plant material was 72% after three days and 88% after seven days. No evidence was found of sexual reproduction. Halophila johnsonii's growth dynamics in the intertidal and shallow subtidal zones are characterized by low biomass, substantial apical meristem density, regular leaf pair production, rapid turnover, and rapid decomposition. Halophila johnsonii's growth in these zones provides an additional level of biomass and detritus to the shallow lagoon system.
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Date Issued: 1997
PURL: http://purl.flvc.org/fcla/dt/15413
Subject Headings: Biology, Botany, Biology, Ecology
Format: Document (PDF)

Title: Statistical analysis of dynamic interdependence patterns in the cortex.
Creator: Truccolo-Filho, Wilson A., Florida Atlantic University, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
Abstract/Description: This dissertation is an investigation of the sources of commonly observed event-related transients in statistical measures of interdependence: variance, cross-correlation, power spectrum density and coherence spectrum density time functions. These measures are often employed in the analysis of spatio-temporal interdependence patterns in neural activity. In order to understand the phenomenon, the origins of the variability of event-related responses are revisited. The time series of single...
Show moreThis dissertation is an investigation of the sources of commonly observed event-related transients in statistical measures of interdependence: variance, cross-correlation, power spectrum density and coherence spectrum density time functions. These measures are often employed in the analysis of spatio-temporal interdependence patterns in neural activity. In order to understand the phenomenon, the origins of the variability of event-related responses are revisited. The time series of single trial cortical event-related potentials typically have a random appearance, and their trial-to-trial variability is commonly explained by the classic signal-plus-noise model, in which random ongoing background noise activity is linearly combined with a stereotyped evoked response. Here, we demonstrate that more realistic models, challenging both the linear superposition and the trial-to-trial stationarity of the event-related responses, can account for such event-related transients. In particular, two effects are considered: the nonlinear gain modulation in neural networks coupled through sigmoid functions and the trial-to-trial variability in amplitude and latency of the event phase-locked responses. An extensive analysis and characterization of both effects in interdependence measures is carried out through both analytical and numerical simulations in Chapter 2. Chapter 3 presents the outcome of testing the predicted effects on UP data recorded from implanted intracortical electrodes in monkeys performing a visuo-motor pattern discrimination task. Overall, the results point to a large contribution of the trial-to-trial variability of event phase-locked responses on the observed event-related transient in statistical interdependence measures. Because variability of the event-related responses is commonly ignored, event-related modulations in power spectral density, cross-correlation, and spectral coherence are often attributed to dynamic changes in functional connectivity within and among neural populations. It becomes then crucial the separation or removal of the trial-to-trial amplitude and latency variability effect from the statistical measures. In order to achieve this goal, the reconstruction of the single trial event phase-locked potentials is required. In Chapter 4, we approach this problem from a Bayesian inference perspective. The posterior probability density is derived for a specified number of event phase-locked components using data from single or multiple sensors. The Maximum A Posteriori solution is used to obtain the phase-locked component waveforms and their single trial parameters. The outcome is a further and definitive support for predominance of the effect of the nonstationarity of the phase-locked responses on the statistical quantities. Based on the theoretical and experimental analysis conducted in Chapters 2, 3 and 4, a framework for the statistical analysis of dynamic spatio-temporal interdependence patterns in Local Field Potential data is articulated.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/11975
Subject Headings: Biology, Biostatistics, Biology, Neuroscience
Format: Document (PDF)

Title: Analyzing connectivity patterns and their application to genetic networks.
Creator: Shehadeh, Lina A., Florida Atlantic University, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
Abstract/Description: The connectivity underlying a complex system determines its global dynamics and its observable functional patterns. Examples are found in a variety of disciplines such as social networks, the Internet, the central nervous system including the cortex, as well as electronic circuits. Novel computational methods from fractal mathematics and "small world" networks provide an entry point to the understanding of the connectiyity and the interaction of its microscopic components from the study of...
Show moreThe connectivity underlying a complex system determines its global dynamics and its observable functional patterns. Examples are found in a variety of disciplines such as social networks, the Internet, the central nervous system including the cortex, as well as electronic circuits. Novel computational methods from fractal mathematics and "small world" networks provide an entry point to the understanding of the connectiyity and the interaction of its microscopic components from the study of the observable variables on the macroscopic system level. As an example of such an approach, we try to understand the underlying connectivity of the genome by analyzing the observable patterns of gene expression profiles made available by cDNA microarrays technology. We start by formulating different models of genetic interactions on a genomic scale and then we compute the statistics of gene expression levels produced from each model. By these means tire obtain a dictionary relating different connection topologies on the microscopic level to corresponding gene expression profiles on the macroscopic system level. To allow for comparison between theory and experiment, we compute the equivalent statistics of experimental cDNA microarrays data obtained from the public domain. Reading the theoretical dictionary backwards and applying it to the statistics of the experimental data, we are able to rule out improbable genetic connectivity patterns and identify the most promising candidates of genetic networks. Our results show that the most promising candidate of genetic network is the "small world" heterogeneous network where the value of the scaling exponent in g(k) = Ak-a is between three halves and six, 3/2 < a < 6. This conclusion is quantitatively supported by the measures of goodness of fit of the models to the experimental data. This would imply that some genes are regulated by the input from a few other genes, while some genes are regulated by the input from many other genes. However, all the genes have a similar pattern of regulatory output onto other genes. We also find that in our genetic interaction models the clustering of the input pattern of the structural connectivity matrices is reflected in the correlation pattern of the functional connectivity matrices. Hence, the model predicts a direct connection between the regulatory links among genes and the co-expression of these genes.
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Date Issued: 2002
PURL: http://purl.flvc.org/fau/fd/FADT12007
Subject Headings: Biology, Biostatistics
Format: Document (PDF)

Title: Identification of influenza type A virus using a fluorogenic neuraminidase assay.
Creator: Fields, Sarah E., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: Influenza virus type A neuraminidase (NA) was detected in the supernatant of virus infected monkey kidney (Vero) and canine kidney (MDCK) cell cultures utilizing isoelectric focusing (IEF) techniques and a fluorogenic substrate, 4-methylumbelliferol-alpha-N-neuraminic acid (4-MUN). Lipids were extracted from the virus infected cells by phase separation in the organic solvent Lipo-clean. The aqueous phase was sonicated in the presence of the detergent NP-40 in order to solubilize the proteins....
Show moreInfluenza virus type A neuraminidase (NA) was detected in the supernatant of virus infected monkey kidney (Vero) and canine kidney (MDCK) cell cultures utilizing isoelectric focusing (IEF) techniques and a fluorogenic substrate, 4-methylumbelliferol-alpha-N-neuraminic acid (4-MUN). Lipids were extracted from the virus infected cells by phase separation in the organic solvent Lipo-clean. The aqueous phase was sonicated in the presence of the detergent NP-40 in order to solubilize the proteins. Concentration of proteins by ultrafiltration and separation by IEF on the PhastSystem (Pharmacia) followed. Proteins from the IEF gel were blotted to nitrocellulose which had been soaked in the 4-MUN substrate solution. Fluorescent bands specific for influenza type A viral NA were detected with a long range UV light. This technique may have applications for use with clinical respiratory specimens since it has the capability to distinguish between bacterial and viral neuraminidases, including type A and B influenza and parainfluenza viruses.
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Date Issued: 1989
PURL: http://purl.flvc.org/fcla/dt/14571
Subject Headings: Biology, Microbiology
Format: Document (PDF)

Title: Mechanism of taurine as a neuroprotector.
Creator: Wu, Heng, Florida Atlantic University, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
Abstract/Description: Taurine is one of the most abundant amino acids in mammals and several functions of taurine have been reported. One important function of taurine is its neuroprotection against the glutamate-induced neuronal damage. It was shown that the glutamate-induced neurotoxicity is caused by overexcitation of glutamate receptors and intracellular calcium, [Ca2+]i, elevation. In this dissertation, the mechanism underlying the action of taurine as a neuroprotector was investigated. It was found that...
Show moreTaurine is one of the most abundant amino acids in mammals and several functions of taurine have been reported. One important function of taurine is its neuroprotection against the glutamate-induced neuronal damage. It was shown that the glutamate-induced neurotoxicity is caused by overexcitation of glutamate receptors and intracellular calcium, [Ca2+]i, elevation. In this dissertation, the mechanism underlying the action of taurine as a neuroprotector was investigated. It was found that taurine protected neurons against glutamate or Bay K 8644-induced neurotoxicity only at the concentration that inhibits the calcium influx induced by those two compounds. Furthermore, taurine couldn't protect neurons against sodium nitroprusside, a NO free radical donor, induced neurotoxicity. These results indicate that taurine exerts its neuroprotection by reducing the glutamate-induced [Ca2+]i elevation. Besides necrosis, apoptosis is another major way that glutamate induces neuronal cell death. The effect of taurine on the glutamate-induced apoptosis was investigated. It was found that taurine prevented the glutamate-induced DNA fragmentation, indicating taurine prevents the glutamate-induced apoptosis. We found that anti-apoptotic proteins (BCL-2 and BCL-X) were down-regulated by glutamate treatment and this down-regulation was prevented by taurine. No difference in pro-apoptotic proteins (BAX and BAD) was found. It was found that the down-regulation of BCL-2 and BCL-X was through calpain-mediated proteolysis, and taurine may exert its anti-apoptotic function by preventing the activation of calpain, which is due to the prevention of [Ca2+]i elevation. Furthermore, it was found that pre-treatment with taurine inhibited the glutamate-induced calcium influx through L-, P/Q-, N-type voltage-gated calcium channels and NMDA receptor. Surprisingly, taurine had no effect on calcium influx through the NMDA receptor when neurons were treated with NMDA in Mg 2+-free medium. The effect of taurine is unlikely through GABA A, or glycine receptors, since bicuculline and picrotoxin (GABA A receptor antagonists), and strychnine (glycine receptor antagonist), failed to block taurine's inhibitory effect on the glutamate-induced calcium influx. Since taurine was found to prevent the glutamate-induced membrane depolarization, we propose that taurine protects neurons against the glutamate excitotoxicity by preventing the glutamate-induced membrane depolarization, probably through the opening of chloride channels, therefore preventing the glutamate-induced calcium influx and the downstream events.
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Date Issued: 2005
PURL: http://purl.flvc.org/fcla/dt/12183
Subject Headings: Biology, Neuroscience
Format: Document (PDF)

Title: Instability and pattern formation in the human brain during complex sensorimotor and auditory tasks as revealed by magnetoencephalography.
Creator: Holroyd, Tom, Florida Atlantic University, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
Abstract/Description: Following Kelso et al. (1991a; 1992), Wallenstein et al. (1995), Tuller et al. (1994), and Case et al. (1995); see also Fuchs et al. (1992), the experiments described in this research all used a dynamical methodology designed to produce a coherent brain state and then lead that brain state through a spontaneous reorganization via the influence of a parametric change. Magnetoencephalographic (MEG) recordings made during the spontaneous behavioral and perceptual transitions were analyzed by...
Show moreFollowing Kelso et al. (1991a; 1992), Wallenstein et al. (1995), Tuller et al. (1994), and Case et al. (1995); see also Fuchs et al. (1992), the experiments described in this research all used a dynamical methodology designed to produce a coherent brain state and then lead that brain state through a spontaneous reorganization via the influence of a parametric change. Magnetoencephalographic (MEG) recordings made during the spontaneous behavioral and perceptual transitions were analyzed by decomposition of the brain's high-dimensional magnetic field into a few task-relevant components. The analysis showed that the dynamics of the MEG signal, including the reorganization which occured as a result of the parametric manipulation, could be accounted for by the dynamics of the individual components. This supports the idea that the task requirements in each case placed the brain into a (relatively) low-dimensional state through the cooperative interactions among the many neuronal elements involved in the task. The experiments included two coordination experiments in which subjects were required to produce index finger flexions in time to an auditory metronome in an anti-phase pattern while the metronome rate was increased. Increases in the variability of both the behavior and the motor-associated magnetic field components prior to the transition to an in-phase pattern support the hypothesis that a dynamic instability mechanism exists for pattern formation and change during those tasks. In the third experiment a perceptual instability was explored by systematically scaling a parameter known to influence categorization of speech stimuli: biasing the transition created stimuli that were perceived in two different ways. The design of the experiment allowed the investigation of neural correlates of the physical properties of the stimuli, perceptual invariance, bistability, and perceptual reorganization. Analysis of the MEG signals suggests that presentation of a bistable stimulus places the brain into a highly sensitive, unstable state that can be influenced by ongoing activity.
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Date Issued: 1997
PURL: http://purl.flvc.org/fcla/dt/12522
Subject Headings: Biology, Neuroscience
Format: Document (PDF)

Title: AN IN VITRO COMPARISON OF LYMPHOCYTE AND MACROPHAGE ACTIVITY AGAINST ROUSSARCOMA VIRUS TRANSFORMED TUMOR CELLS.
Creator: STEPHENSON, SUSAN ELIZABETH, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: The effects of rat peritoneal macrophages and peripheral blood lymphocytes on syngeneic Rous sarcoma virus-transformed tumor cells were studied. Normal lymphocytes and peptoneinduced macrophages of non-tumor bearing Wistar rats prevented tumor cell incorporation of 3H-thymidine by 50-78%. Macrophages of rats which had been injected with 1 x 10^6 ultraviolet inactivated tumor cells lost their original antitumor activity (60% inhibition) by day 10 (20% inhibition) and appeared to regain it...
Show moreThe effects of rat peritoneal macrophages and peripheral blood lymphocytes on syngeneic Rous sarcoma virus-transformed tumor cells were studied. Normal lymphocytes and peptoneinduced macrophages of non-tumor bearing Wistar rats prevented tumor cell incorporation of 3H-thymidine by 50-78%. Macrophages of rats which had been injected with 1 x 10^6 ultraviolet inactivated tumor cells lost their original antitumor activity (60% inhibition) by day 10 (20% inhibition) and appeared to regain it slightly by day 17. Lymphocytes from immunized animals did not exhibit anti-tumor activity but instead enhanced the incorporation of thymidine into the tumor cells by 25%. By day 17, all anti-tumor activity returned to lymphocytes, whereas macrophage activity only slightly increased. A possible explanation of the phenomenon was presented. Parameters affecting the incorporatidn of 3H-thymidine by and ultraviolet inactivation of tumor cells were delineated.
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Date Issued: 1976
PURL: http://purl.flvc.org/fcla/dt/13795
Subject Headings: Biology, General
Format: Document (PDF)

Title: Expression of tear lipocalin and MMPs in the lacrimal gland and their implication in dry eye disease.
Creator: Kota, Smitha J., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: Tear lipocalin is a member of the lipocalin superfamily. Homologues have been identified in different species. In this study 18kDa lipocalin protein was identified in lacrimal fluid from New Zealand white rabbits. Densitometric analysis revealed that lacrimal fluid from sexually mature female showed significantly higher expression of lipocalin than the sexually mature male. The sexually mature rabbits had higher expression of lipocalin compared to the juveniles. However no significant...
Show moreTear lipocalin is a member of the lipocalin superfamily. Homologues have been identified in different species. In this study 18kDa lipocalin protein was identified in lacrimal fluid from New Zealand white rabbits. Densitometric analysis revealed that lacrimal fluid from sexually mature female showed significantly higher expression of lipocalin than the sexually mature male. The sexually mature rabbits had higher expression of lipocalin compared to the juveniles. However no significant differences in expression of lipocalin was detected between the juvenile male and female rabbits. Matrix metalloproteinses are members of the metzincin family. Gelatinases (MMP-2 & MMP-9) are known to degrade the extracellular matrix. Sexually mature female animals showed the highest expression of gelatinases. Higher expression of MMP-9 was detected in the epithelial (acinar) cell culture supernatants. Higher expression of MMP-2 was detected in the interstitial (lymphocyte) cell culture supernatants from the lacrimal gland.
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Date Issued: 2003
PURL: http://purl.flvc.org/fcla/dt/13101
Subject Headings: Biology, Molecular
Format: Document (PDF)

Title: THERMALLY INDUCED VARIATIONS IN VERTEBRAL NUMBER IN LUCANIA PARVA BAIRD (ANTHERINIFORMES: CYPRINODONTIDAE) REARED IN THE LABORATORY.
Creator: MCCARTHY, LINDA J., Florida Atlantic University, Courtenay, Walter R. Jr., Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: Embryos of Lucania parva Baird from two sites in the Florida Keys were raised in four temperature regimes, 18°, 22°, 26°, and 30°C to determine the response of vertebral numbers to different incubation temperatures. The result was in inverse linear relationship, with vertebral numbers increasing with decreasing temperature. Temperature modified the developmental rates, causing the embryos in the warm temperatures to hatch earlier than those in the cold temperatures.
Date Issued: 1978
PURL: http://purl.flvc.org/fcla/dt/13951
Subject Headings: Biology, Zoology
Format: Document (PDF)

Title: A marine biological sampling device (MBSD).
Creator: Clark, A. M.
Date Issued: 1985-10-28
PURL: http://purl.flvc.org/fcla/dt/3358982
Subject Headings: Sampling, Marine biology, Marine biology--Research
Format: Document (PDF)

Title: In memoriam: John Hood Ryther 1922-2006.
Creator: Mann, Roger, Yentsch, Charles S., Lapointe, Brian E.
Date Issued: 2007
PURL: http://purl.flvc.org/FCLA/DT/3174063
Subject Headings: Plankton, Marine plankton, Marine biology, Biological oceanography
Format: Document (PDF)

Title: Phytochemical-induced apoptotic cell death in breast cancer cells.
Creator: Hörmann, Vanessa P., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: Breast cancer is the most common malignant cancer and leading cause of death in women between the ages of 40 and 55. Among dietary phytochemicals with demonstrated anti-tumor activities are genistein (4', 5', 7-trihydroxyisoflavone) and pomegranate (punica granatum). The present study was to demonstrate the potential anticancer activities of genistein and pomegranate and the mechanism of action in human breast cancer cells. Study design. MCF-7 cells were grown in RPMI medium and then seeded...
Show moreBreast cancer is the most common malignant cancer and leading cause of death in women between the ages of 40 and 55. Among dietary phytochemicals with demonstrated anti-tumor activities are genistein (4', 5', 7-trihydroxyisoflavone) and pomegranate (punica granatum). The present study was to demonstrate the potential anticancer activities of genistein and pomegranate and the mechanism of action in human breast cancer cells. Study design. MCF-7 cells were grown in RPMI medium and then seeded in 48-well MTP, and cultured at 37C, 5% CO2 for 36hr to achieve 80-90% confluence. The cells were then exposed to varying concentrations of genistein and pomegranate for 24 and 48hr. The treated cells were tested for (i) post-treatment sensitivity using MTT and Trypan Blue exclusion assay, and (ii) treatment-induced apoptosis using Rh123, Acridine Orange-Ethidium Bromide nuclear stains and Caspase binding assay. Results. Data indicated that both compounds effectively killed cancer cells mostly via apoptosis induction.
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Date Issued: 2006
PURL: http://purl.flvc.org/fcla/dt/13391
Subject Headings: Biology, Cell, Biology, Physiology, Health Sciences, Oncology
Format: Document (PDF)

Title: Phosphorus uptake rates of a Ceratophyllum/periphyton community in a southern Florida freshwater marsh.
Creator: Pietro, Kathleen C., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description: Net uptake rates of soluble reactive phosphate (SRP) of Ceratophyllum demersum and the dense periphyton mat associated with the macrophyte were calculated by measuring the disappearance of stable phosphorus (30, 50, 100, or 200 μg P/L) from the water column over a one-hour period each month for one year. Two seasonal periods were established based on average photosynthetically active radiation (PAR) and length of daylight through the year. ANOVA showed that the uptake rates were significantly...
Show moreNet uptake rates of soluble reactive phosphate (SRP) of Ceratophyllum demersum and the dense periphyton mat associated with the macrophyte were calculated by measuring the disappearance of stable phosphorus (30, 50, 100, or 200 μg P/L) from the water column over a one-hour period each month for one year. Two seasonal periods were established based on average photosynthetically active radiation (PAR) and length of daylight through the year. ANOVA showed that the uptake rates were significantly affected (P < 0.05) by the amount of SRP added and were greater during the period of increased irradiance. Uptake rates continued to increase, even at spike concentrations equal to 10,000 μg P/L, indicating that maximum uptake was not achieved and that this plant complex is able to sequester even greater amounts of SRP. Estimates of the yearly uptake capabilities of the plant complex for a 525 ha wetland for the 30, 50, 100, 200 μg P/L spike treatments were 27, 55, 103, and 182 kg P/yr, respectively.
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Date Issued: 1998
PURL: http://purl.flvc.org/fcla/dt/15601
Subject Headings: Biology, Ecology, Biogeochemistry, Biology, Plant Physiology
Format: Document (PDF)

Title: A neuroanatomical investigation of the median raphe nucleus, supramammillary nucleus, and nucleus reuniens: Possible implications for the modulation of the hippocampal EEG.
Creator: McKenna, James Timothy, Florida Atlantic University, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
Abstract/Description: The theta rhythm of the hippocampus, present in area CA1 of Ammon's horn and the dentate gyrus, is thought to serve a role in short-term memory processing. Rhythmically bursting cells of the medial septum projecting to the hippocampus are responsible for pacing theta. Further anatomical investigation of limbic-related circuitry in the rat, particularly connections of the medial septum and hippocampus, will lead to a better understanding of the pathways which influence the hippocampal EEG. Our...
Show moreThe theta rhythm of the hippocampus, present in area CA1 of Ammon's horn and the dentate gyrus, is thought to serve a role in short-term memory processing. Rhythmically bursting cells of the medial septum projecting to the hippocampus are responsible for pacing theta. Further anatomical investigation of limbic-related circuitry in the rat, particularly connections of the medial septum and hippocampus, will lead to a better understanding of the pathways which influence the hippocampal EEG. Our first study examined single and collateral projections from the supramammillary nucleus to the medial septum and hippocampus, employing the retrograde fluorescent tracers FluoroGold and FluoroRuby. The supramammillary nucleus neurons we identified with collateral projections to the medial septum and hippocampus may be directly involved in generation of the theta rhythm. The second study examined single and collateral projections from the median raphe nucleus to the medial septum and hippocampus, employing the retrograde tracers FluoroGold and FluoroRuby. It has been proposed that the median raphe nucleus serves a direct role in desynchronization of the hippocampal EEG, or blockade of theta. The median raphe nucleus neurons we identified with collateral projections to the medial septum and hippocampus may be directly involved in the termination of theta, in turn modulating hippocampal memory processing. The third study examined afferent projections to the nucleus reuniens of the thalamus, employing the retrograde tracer FluoroGold, combined with a primary-antibody immunohistochemical procedure, in order to identify FluoroGold labeled cells by means of bright-field microscopy. RE afferents originate from widespread regions of the brain, providing multi-sensory and limbic input to RE. The fourth study examined efferents of the nucleus reuniens, employing the anterograde tracer PHA-L (Phaseolus vulgaris-leucoagglutinin). RE efferents terminated largely in regions of the telencephalon, and may influence working memory and sensorimotor systems. Investigations have linked the theta rhythm of the hippocampus to memory processing. The activity of the supramammillary nucleus, median raphe nucleus, and nucleus reuniens may influence the hippocampal EEG, particularly theta, and hence hippocampal mnemonic processing, by means of the pathways described in this dissertation.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/11971
Subject Headings: Biology, Anatomy, Biology, Neuroscience, Psychology, Psychobiology
Format: Document (PDF)

Title: Ultrastructure of oogenesis in the holopelagic polychaetes Rhynchonerella angelini and Alciopa reynaudii ( Polychaeta: Alciopidae).
Creator: Eckelbarger, Kevin J., Rice, Stanley A., Harbor Branch Oceanographic Institute
Date Issued: 1988
PURL: http://purl.flvc.org/FCLA/DT/3333108
Subject Headings: Polychaeta, Oogenesis, Reproductive biology
Format: Document (PDF)

Title: Population biology and larval development of the terebellid polychaete Nicolea zostericola.
Creator: Eckelbarger, Kevin J., Harbor Branch Oceanographic Institute
Date Issued: 1974
PURL: http://purl.flvc.org/FCLA/DT/3176679
Subject Headings: Polychaeta, Population biology, Terebellida
Format: Document (PDF)

Title: Primary production in three subtropical seagrass communities: a comparison of four autotrophic components.
Creator: Jensen, P. R., Gibson, R. A., Harbor Branch Oceanographic Institute
Date Issued: 1986
PURL: http://purl.flvc.org/fau/fd/FA00007492
Subject Headings: Seagrasses, Primary productivity (Biology)
Format: Document (PDF)

Title: Ultrastructural Studies on some Mastogloia (Baccilariophyceae) species belonging to the group ellipticae.
Creator: Stephens, F. C., Gibson, R. A., Harbor Branch Oceanographic Institute
Date Issued: 1979
PURL: http://purl.flvc.org/fau/fd/FA00007003
Subject Headings: Ultrastructure (Biology), Bacillariophyceae, Diatoms
Format: Document (PDF)

Title: Valve structure in Mastogloia Rostrata with a comparison of intercalary band internal construction in two dissimilardiatom species.
Creator: Gibson, R. A., Stephens, F. C., Harbor Branch Oceanographic Institute
Date Issued: 1985
PURL: http://purl.flvc.org/fau/fd/FA00007169
Subject Headings: Diatoms, Ultrastructure (Biology)
Format: Document (PDF)

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