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- Title
- A comparison of the ontogeny of energy consumption in leatherback, Dermochelys coriacea and olive ridley, Lepidochelys olivacea sea turtle hatchlings.
- Creator
- Jones, T. Todd, Florida Atlantic University, Lutz, Peter L., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Changes in activity related oxygen consumption and energy partitioning were measured in leatherback and olive ridley sea turtle hatchlings over their first month after nest emergence. Leatherbacks emerge with about 75--90 KJ of energy in the residual yolk at their disposal for growth and movement. In comparison, the residual yolk energy reserves for the olive ridley are estimated to be much less (45 KJ). In leatherbacks resting specific oxygen consumption rates decreased by 53% over the first...
Show moreChanges in activity related oxygen consumption and energy partitioning were measured in leatherback and olive ridley sea turtle hatchlings over their first month after nest emergence. Leatherbacks emerge with about 75--90 KJ of energy in the residual yolk at their disposal for growth and movement. In comparison, the residual yolk energy reserves for the olive ridley are estimated to be much less (45 KJ). In leatherbacks resting specific oxygen consumption rates decreased by 53% over the first post-hatching month (0.0065 ml O2 min-1 g-1--0.0031 ml O2 min-1 g-1), while for ridleys the fall was 32% (0.0038 ml O2 min-1 g-1--0.0026 ml O2 min-1 g-1). Greater differences were seen in aerobic scope. For olive ridleys the factorial aerobic scope doubled over the first month but there was no significant increase in the leatherback's factorial aerobic scope. Leatherback hatchlings gained on average 33% body mass (10 g) over the first week however 70 to 80% of this increase was due to water accumulation. The differences in aerobic scope and energy reserves are related to differences in early life ecological stratagems of these species.
Show less - Date Issued
- 2004
- PURL
- http://purl.flvc.org/fcla/dt/13139
- Subject Headings
- Sea turtles--Ecology, Animal behavior, Ontogeny, Developmental biology, Adaptation (Physiology), Ecophysiology
- Format
- Document (PDF)
- Title
- Effects of upper respiratory tract disease on the demographics of a gopher tortoise (Gopherus polyphemus) population in south Florida.
- Creator
- Karlin, Melissa Lynn, Florida Atlantic University, Moore, Jon, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Upper Respiratory Tract Disease is a highly contagious bacteria observed in gopher tortoise populations in Florida as early as 1989. In this study, 40 plasma samples were collected from a population to determine the effects on different age classes and genders. Results suggest adults are more susceptible to the disease and there is not a significant difference in the number of infected males and females. All subadults tested in this population were free of the disease. The effect on growth...
Show moreUpper Respiratory Tract Disease is a highly contagious bacteria observed in gopher tortoise populations in Florida as early as 1989. In this study, 40 plasma samples were collected from a population to determine the effects on different age classes and genders. Results suggest adults are more susceptible to the disease and there is not a significant difference in the number of infected males and females. All subadults tested in this population were free of the disease. The effect on growth rate was negligible; seropositive and seronegative individuals did not exhibit statistically significant differences in growth rates. In addition, an analysis of home range size reveals that adult males have the greatest home range size, which may provide a route for disease transmission to other adults. The long-term effects of URTD are still unknown; however, this data suggests a zero known mortality rate due to URTD over a four-year period.
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/13258
- Subject Headings
- Gopher tortoise--Diseases, Mycoplasma diseases in animals--Florida
- Format
- Document (PDF)
- Title
- Specific dynamic action in hatchling and post-hatchling green (Chelonia mydas) and loggerhead (Caretta caretta ) sea turtles.
- Creator
- Kowalski, Amy, Florida Atlantic University, Milton, Sarah L., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Specific dynamic action (SDA) describes a post-feeding increase in oxygen consumption where most energy derived from food is allocated to post-absorptive processes, including growth and maintenance. SDA and growth in hatchling sea turtles is of special interest because they experience drastic changes in diet, oxygen availability and habitat during the first several months of life. This study investigated SDA variation between species and among age groups. SDA was quantified in two species of...
Show moreSpecific dynamic action (SDA) describes a post-feeding increase in oxygen consumption where most energy derived from food is allocated to post-absorptive processes, including growth and maintenance. SDA and growth in hatchling sea turtles is of special interest because they experience drastic changes in diet, oxygen availability and habitat during the first several months of life. This study investigated SDA variation between species and among age groups. SDA was quantified in two species of sea turtle (Chelonia mydas, Caretta caretta) at 7, 30, 60, & 90 days post-hatching. Turtles were fed a known amount of food, and oxygen consumption was monitored using a metabolic chamber. SDA percentage of total energy did not increase with age (species pooled), although magnitude of SDA was higher in C. mydas when compared to C. caretta (ages pooled). These results imply that SDA does not increase proportionally with age, and that hatchling C. mydas use more absolute energy for SDA than C. caretta .
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/13283
- Subject Headings
- Adaptation (Biology), Sea turtles--Feeding and feeds, Physiology, Comparative, Sea turtles--Ecology
- Format
- Document (PDF)
- Title
- The role of chemical and visual cues by two Sargassum shrimps in locating and selecting habitats.
- Creator
- Jobe, Corrine F., Florida Atlantic University, Brooks, W. Randy, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
The Sargassum community is comprised of a unique and diverse assemblage of organisms. Habitat detection by two of the most common invertebrates, Latreutes fucorum and Leander tenuicornis , was investigated. Results of this study do not support that either L. fucorum or L. tenuicornis respond to chemical cues released by the Sargassum habitat in the absence of other information. Habitat selection of both shrimp species was examined as well. Both L. fucorum and L. tenuicornis selected live...
Show moreThe Sargassum community is comprised of a unique and diverse assemblage of organisms. Habitat detection by two of the most common invertebrates, Latreutes fucorum and Leander tenuicornis , was investigated. Results of this study do not support that either L. fucorum or L. tenuicornis respond to chemical cues released by the Sargassum habitat in the absence of other information. Habitat selection of both shrimp species was examined as well. Both L. fucorum and L. tenuicornis selected live Sargassum over artificial Sargassum . Moreover, L. fucorum selected Sargassum natans over Sargassum fluitans when only visual cues were available, whereas large-sized L. tenuicornis selected S. fluitans under the same conditions. Conversely, habitat selection trials combining both chemical and visual cues resulted in no preference between the two Sargassum species by either shrimp species. Additional ecological factors that possibly influence habitat location and selection are discussed as well as the importance of Sargassum in terms of pelagic fisheries management.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13381
- Subject Headings
- Habitat (Ecology), Sargassum, Marine chemical ecology, Animal behavior
- 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.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13391
- Subject Headings
- Biology, Cell, Biology, Physiology, Health Sciences, Oncology
- Format
- Document (PDF)
- Title
- THE EFFECT OF TEMPERATURE, HYDROGEN ION AND CERTAIN GROWTH SUBSTRATES ON THE ACTIVITY OF THE CELLULOLYTIC ENZYME COMPLEX IN SELECTED MARINE FUNGI.
- Creator
- JENSEN, JAMES ROBERT, Florida Atlantic University, Sguros, Peter L., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Halosphaeria mediosetigera and Culcitalna achraspora have been studied to elucidate the mechanism by which they degrade cellulosic materials in the sea. H. mediosetigera (700 LC 1), a C1-less variant, was also employed in this work. Standardized shake-cultures were grown on cellulose and cellulose derivatives supplemented with NH4N03, tris(hydroxymethyl)aminomethane and yeast extract in artificial sea water (Lyman and Fleming), pH 7.5, at 25 C. Induced C1 and Cx enzyme and cellobiase...
Show moreHalosphaeria mediosetigera and Culcitalna achraspora have been studied to elucidate the mechanism by which they degrade cellulosic materials in the sea. H. mediosetigera (700 LC 1), a C1-less variant, was also employed in this work. Standardized shake-cultures were grown on cellulose and cellulose derivatives supplemented with NH4N03, tris(hydroxymethyl)aminomethane and yeast extract in artificial sea water (Lyman and Fleming), pH 7.5, at 25 C. Induced C1 and Cx enzyme and cellobiase activities were determined calorimetrically by correlation with cotton fiber weight loss, by the formation of reducing sugars from carboxymethylcellulose and by Glucostat, respectively. Optimum pH values for both Cx enzyme and cellobiase of C. achraspora were 6.0 at 37 C while those for H. mediosetigera (700 LC 1) were 5.0 and 6.0, respectively, at 37 C. In both cultures, Cx enzymes had a variable optimum temperature ( 37-50 C) at pH 6.0, depending on the length of the incubation period, while cellobiases had the same optimum temperature (50 C) at pH 6.0. Thermostability observations on Cx enzyme and cellobiase of C. achraspora showed almost complete deactivation at 100 C in 15 min for the former and 50 C in 15 min for the latter. Thermostability observations on Cx enzyme and cellobiase of H. mediosetigera (700 LC 1) showed almost complete deactivation at 45 C in 15 min for the former and at 50 C in 15 min for the latter. Data indicate that at least three enzymatic functions are involved in cellulose breakdown by these cultures.
Show less - Date Issued
- 1971
- PURL
- http://purl.flvc.org/fcla/dt/13434
- Subject Headings
- Marine fungi, Cellulose--Biodegradation
- Format
- Document (PDF)
- Title
- EASTERN PACIFIC FISHES OF THE GENUS HAEMULON (POMADASYIDAE).
- Creator
- HONG, SUSAN LEE, Florida Atlantic University, Courtenay, Walter R. Jr., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Five eastern Pacific species of the genus Haemulon Cuvier are described, their color pattern and dentition illustrated, and a key presented for their identification. Lythrulon Jordan and Swain and Orthostoechus Gill are synonymized with Haemulon. Haemulon scudderi Gill, Haemulon sexfasciatum Gill, Haemulon flavigattatum Gill, and Haemulon maculicauda (Gill) are found exclusively in the Pacific while Haemulon steindachneri (Jordan and Gilbert) is found both in the Atlantic and the Pacific.
- Date Issued
- 1974
- PURL
- http://purl.flvc.org/fcla/dt/13676
- Subject Headings
- Grunts (Fishes)
- Format
- Document (PDF)
- Title
- A SURVEY OF THE FISH FAUNA IN THE SHALLOW MARINE WATERS OF CLAM LAGOON, ADAK, ALASKA.
- Creator
- HANCOCK, MAX JAY., Florida Atlantic University, Courtenay, Walter R. Jr., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
A seasonal sampling of fishes was collected by seine from the sand-gravel areas of Clam Lagoon, Adak, Alaska. The community structure was compared to the structure of communities described from surveys of other areas. The seasonality of the fish fauna was examined for possible relationships with three exogenous factors; salinity, temperature and wind velocity. Length frequency histograms and substrate preferences are presented for seven species. The shallow-water seasonality of 13 species is...
Show moreA seasonal sampling of fishes was collected by seine from the sand-gravel areas of Clam Lagoon, Adak, Alaska. The community structure was compared to the structure of communities described from surveys of other areas. The seasonality of the fish fauna was examined for possible relationships with three exogenous factors; salinity, temperature and wind velocity. Length frequency histograms and substrate preferences are presented for seven species. The shallow-water seasonality of 13 species is presented. The ontogenetic and seasonal diets of seven species are discussed.
Show less - Date Issued
- 1975
- PURL
- http://purl.flvc.org/fcla/dt/13711
- Subject Headings
- Fish populations--Alaska--Clam Lagoon, Adak
- Format
- Document (PDF)
- Title
- AN EXPERIMENT IN TEACHING TECHNIQUE: TRADITIONAL INSTRUCTION COMPARED TO STUDENT INVOLVEMENT IN THE LEARNING PROCESS (SECONDARY SCIENCE).
- Creator
- JANES, SHELLEY KING, Florida Atlantic University, Adams, Ralph M., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
The history of the public high school is discussed including characterization of the slow learner, the culturally disadvantaged and the problem student. Two identical groups of students participated in the experiment; one group actively and physically involved in the educational process; the other less actively and physically involved. The raw score data were statistically analyzed. The mean, median and ninety-five percent confidence interval were similar for both groups. Thus, attempts to...
Show moreThe history of the public high school is discussed including characterization of the slow learner, the culturally disadvantaged and the problem student. Two identical groups of students participated in the experiment; one group actively and physically involved in the educational process; the other less actively and physically involved. The raw score data were statistically analyzed. The mean, median and ninety-five percent confidence interval were similar for both groups. Thus, attempts to physically involve these students will not increase their achievement. The current methods of teaching, curricula and building designs are discussed.
Show less - Date Issued
- 1976
- PURL
- http://purl.flvc.org/fcla/dt/13784
- Subject Headings
- Botany--Study and teaching (Secondary), Slow learning children, Children with social disabilities--Education (Secondary)
- 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.
Show less - Date Issued
- 1976
- PURL
- http://purl.flvc.org/fcla/dt/13795
- Subject Headings
- Biology, General
- Format
- Document (PDF)
- Title
- ANTENNULAR CHEMOSENSITIVITY TO FEEDING STIMULI IN THE SPINY LOBSTER PANULIRUS ARGUS.
- Creator
- JOHNSON, BRUCE RAYMOND, Florida Atlantic University, Ache, Barry W., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Antennular chemoreceptors of P. argus were surveyed electro-physiologically to determine their relative sensitivity to low molecular weight components of the shrimp, Penaeus duorarum. An ultrafiltrate (less than 1,000 molecular weight) of shrimp extract did not differ significantly in stimulus value from the total extract itself. A mixture of the 19 amino acids present in the ultrafiltrate was slightly less stimulatory than the total extract. Taurine alone approximated the stimulus value of...
Show moreAntennular chemoreceptors of P. argus were surveyed electro-physiologically to determine their relative sensitivity to low molecular weight components of the shrimp, Penaeus duorarum. An ultrafiltrate (less than 1,000 molecular weight) of shrimp extract did not differ significantly in stimulus value from the total extract itself. A mixture of the 19 amino acids present in the ultrafiltrate was slightly less stimulatory than the total extract. Taurine alone approximated the stimulus value of the amino acid mixture at its component concentration. Taurine was also the most stimulatory of the 19 amino acids when compared at the homogeneous 10^-3 M concentration. Taurine is the major individual stimulant of shrimp extract but a contribution is also made from other non-amino acid low molecular weight compounds.
Show less - Date Issued
- 1976
- PURL
- http://purl.flvc.org/fcla/dt/13805
- Subject Headings
- Caribbean spiny lobster, Spiny lobsters, Chemoreceptors
- Format
- Document (PDF)
- Title
- LARVAL DEVELOPMENT OF THE SNOOK, CENTROPOMUS UNDECIMALIS (PISCES: CENTROPOMIDAE), REARED IN THE LABORATORY.
- Creator
- LAU, STEPHEN R., Florida Atlantic University, Courtenay, Walter R. Jr., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Advanced embryos, larval and early juvenile snook, Centropomus undecimalis, are described from laboratory reared specimens. This description includes details of advanced embryos, changes in body shape, pigmentation, and osteological development. Eggs ranged from 0.68 to 0.73 mm in diameter with a single oil globule. Larvae were between 1.4 and 1.5 mm standard length at hatching. The yolk sac was absorbed by 2.2 mm and adult pigmentation began to appear on the head and fins by 7.0 mm....
Show moreAdvanced embryos, larval and early juvenile snook, Centropomus undecimalis, are described from laboratory reared specimens. This description includes details of advanced embryos, changes in body shape, pigmentation, and osteological development. Eggs ranged from 0.68 to 0.73 mm in diameter with a single oil globule. Larvae were between 1.4 and 1.5 mm standard length at hatching. The yolk sac was absorbed by 2.2 mm and adult pigmentation began to appear on the head and fins by 7.0 mm. Ossification had commenced by 5.5 mm and all bones, except the ethmoid and preyomer, had at least begun to ossify by 21.9 mm. Illustrations of snook eggs and larvae, including details of the caudal skeleton, are presented to show changes that occurred during development.
Show less - Date Issued
- 1977
- PURL
- http://purl.flvc.org/fcla/dt/13894
- Subject Headings
- Centropomidae
- 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
- HABITAT PREFERENCES AND ASSOCIATIONS OF A UNISEXUAL-BISEXUAL COMPLEX OF POECILIA (PISCES: POECILIIDAE) FROM NORTHEASTERN MEXICO.
- Creator
- KUCHARSKI, KRISTINE MARIE., Florida Atlantic University, Courtenay, Walter R. Jr., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Two gynogenetically reproducing unisexuals, the diploid Poecilia formosa and its associated triploid are sympatric to P. mexicana, a bisexual species, in northeastern Mexico. All compete for sperm from P. mexicana males. Field and laboratory experiments studied habitat. preferences and associations as mechanisms of reducing competition. A new tagging method was developed. Laboratory results (Phase One) indicated habitat preferences of each female type. Further studies (Phase Two) showed the...
Show moreTwo gynogenetically reproducing unisexuals, the diploid Poecilia formosa and its associated triploid are sympatric to P. mexicana, a bisexual species, in northeastern Mexico. All compete for sperm from P. mexicana males. Field and laboratory experiments studied habitat. preferences and associations as mechanisms of reducing competition. A new tagging method was developed. Laboratory results (Phase One) indicated habitat preferences of each female type. Further studies (Phase Two) showed the fishes remained together but each female type associated with its own kind. Shade and a gravel substrate were important habitat parameters. Specific habitat preferences may not be adaptive due to seasonal water fluctuations but there are different ecological preferences by each female type. Associations could account for Phase One laboratory results and ecological differences. Combined data indicate associations are the likely mechanism, but habitat preferences are possible. Seasonal factors and artificial conditions may have caused diverse results.
Show less - Date Issued
- 1979
- PURL
- http://purl.flvc.org/fcla/dt/13960
- Subject Headings
- Ichthyology--Research
- Format
- Document (PDF)
- Title
- FLICKING ENHANCES THE RESPONSE OF ANTENNULAR CHEMORECEPTORS IN THE SPINY LOBSTER, PANULIRUS ARGUS.
- Creator
- SCHMITT, BRIAN CHRISTOPHER, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Periodic movements of the olfactory organs in the spiny lobster known as antennular "flicking" temporally enhance the response of the olfactory receptors to changes in the odor environment. The temporally enhanced response onsets as a series of transient discharges phase locked with the flick. This response pattern results from superimposed increases in stimulus concentration at the receptor sites due to flicking modulated permeability of a chemical diffusion barrier surrounding the receptors...
Show morePeriodic movements of the olfactory organs in the spiny lobster known as antennular "flicking" temporally enhance the response of the olfactory receptors to changes in the odor environment. The temporally enhanced response onsets as a series of transient discharges phase locked with the flick. This response pattern results from superimposed increases in stimulus concentration at the receptor sites due to flicking modulated permeability of a chemical diffusion barrier surrounding the receptors, presumably created by the densely packed nature of the receptor hair tuft. It is concluded that flicking provides the lobster with a physiological mechanism to compensate for the indiscrete temporal nature of chemical stimumi.
Show less - Date Issued
- 1979
- PURL
- http://purl.flvc.org/fcla/dt/13963
- Subject Headings
- Caribbean spiny lobster, Spiny lobsters, Chemoreceptors
- Format
- Document (PDF)
- Title
- THE EFFECTS OF LIGHT ON THE BIORHYTHM OF ROOT PRESSURE EXUDATION IN HELIANTHUS ANNUS.
- Creator
- Miller, Albert R., Florida Atlantic University, Boss, Manley L., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Intact sunflower plants were exposed to various lighting conditions, then detopped and the exudation rate determined at 1 hr intervals. The rhythm responded to the "lights-off" signal as evidenced when plants were cultured under different daylengths. A brief exposure given just before the cycle mini mum (circadian time 21) caused maximum phase shift. When irradiated with white light, a dosage of 7.5 min at 2500 fc was calculated to cause a minimum phase shift, while a dosage of 60 min at 2500...
Show moreIntact sunflower plants were exposed to various lighting conditions, then detopped and the exudation rate determined at 1 hr intervals. The rhythm responded to the "lights-off" signal as evidenced when plants were cultured under different daylengths. A brief exposure given just before the cycle mini mum (circadian time 21) caused maximum phase shift. When irradiated with white light, a dosage of 7.5 min at 2500 fc was calculated to cause a minimum phase shift, while a dosage of 60 min at 2500 fc caused a maximum phase shift. The time necessary f or the stimulus messenger to travel from the receptor area (leaves) to the effector area (roots) was determined to be 1-2 hrs. Exposure to far-red or red light was found to be more effective for shifting the phase than blue or green light. This suggests that the rhythm may be governed by the High Energy Reaction of phytochrome.
Show less - Date Issued
- 1979
- PURL
- http://purl.flvc.org/fcla/dt/13974
- Subject Headings
- Biological rhythms in plants
- Format
- Document (PDF)
- Title
- AN ECOLOGICAL STUDY OF THE FLORIDA ROYAL PALM, ROYSTONEA ELATA (BARTRAM) F. HARPER.
- Creator
- JONES, JULIE LYNN, Florida Atlantic University, Austin, Daniel F., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
The object of this study was to determine habitat preference (seedlings) and adults) and the population status of the Florida Royal Palm (Roystonea elata (Bartram) F. Harper], in the Fakahatchee Strand State Preserve. Associated species, seedling establishment and germination, growth rates, size class ratios and elevation of establishment (epiphytic nature) were examined. The palm showed a preference for high ground as indicated by the increasing colonization of elevated logging tramways....
Show moreThe object of this study was to determine habitat preference (seedlings) and adults) and the population status of the Florida Royal Palm (Roystonea elata (Bartram) F. Harper], in the Fakahatchee Strand State Preserve. Associated species, seedling establishment and germination, growth rates, size class ratios and elevation of establishment (epiphytic nature) were examined. The palm showed a preference for high ground as indicated by the increasing colonization of elevated logging tramways. Seeds germinated under low light conditions in 17-22 days. Seedlings had an escalating growth rate from 4.2 em/year for seedlings to approximately 50 em/year for adults. Each size class was well represented in the Fakahatchee Strand, suggesting that reproduction was not being hindered by changes in water level, cold and area urbanization. Elevation of seedling establishment was a function of water level during that particular year and did not correlate year to year. These data indicate a stabilization of the Royal Palm population in the Fakahatchee Strand.
Show less - Date Issued
- 1983
- PURL
- http://purl.flvc.org/fcla/dt/14154
- Subject Headings
- Palms--Florida
- Format
- Document (PDF)
- Title
- OLD FIELD SUCCESSION IN EVERGLADES NATIONAL PARK.
- Creator
- KRAUSS, PAMELA, Florida Atlantic University, Austin, Daniel F., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
A characterization of successional vegetation patterns on abandoned farmland in the Hole-in-the-Donut area of Everglades National Park was performed. Vegetative community composition and structure were examined in detail in twenty-one study plots located throughout the study site. Successional assemblages are described qualitatively and quantitatively. Distinct community types are defined using methods that emphasize site-to-site comparisons. The relationship between vegetation and substrate,...
Show moreA characterization of successional vegetation patterns on abandoned farmland in the Hole-in-the-Donut area of Everglades National Park was performed. Vegetative community composition and structure were examined in detail in twenty-one study plots located throughout the study site. Successional assemblages are described qualitatively and quantitatively. Distinct community types are defined using methods that emphasize site-to-site comparisons. The relationship between vegetation and substrate, farming history, hydroperiod, and spatial arrangement was examined. Results were used to summarize and predict trends of old field succession on abandoned farmland in southern Florida. Post-farming vegetation patterns do not resemble prefarming conditions. Successional forest, frequently dominated by exotic species, is a relatively new community in southern Florida. It is likely a final stage in secondary succession on abandoned farmland.
Show less - Date Issued
- 1983
- PURL
- http://purl.flvc.org/fcla/dt/14180
- Format
- Document (PDF)
- Title
- EFFECT OF N-METHYL-N'-NITRO-N-NITROSOGUANIDINE (MNNG) ON DNA OF CULTURED RAT HEPATOMA CELLS.
- Creator
- JHABVALA, PERSEUS, Florida Atlantic University, Stein, Abraham, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
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The objective of this study was to elucidate the interaction of the carcinogen MNNG with nuclear DNA of Rat Hepatoma cells. The effect of a range of MNNG concentrations on RH cell DNA was studied by an analysis of the DNA fragments obtained in linear alkaline sucrose gradients. A macromolecular analysis of the sedimentation profile for 0.06 mM MNNG (Experiment I), and 0.1 mM MNNG (Experiment III), suggested that the system was paucidisperse and contained at least three components. The major...
Show moreThe objective of this study was to elucidate the interaction of the carcinogen MNNG with nuclear DNA of Rat Hepatoma cells. The effect of a range of MNNG concentrations on RH cell DNA was studied by an analysis of the DNA fragments obtained in linear alkaline sucrose gradients. A macromolecular analysis of the sedimentation profile for 0.06 mM MNNG (Experiment I), and 0.1 mM MNNG (Experiment III), suggested that the system was paucidisperse and contained at least three components. The major component Max 1 has a molecular weight comparable to that known for the mammalian replicon. Max 2 has a molecular weight twice that of Max 1 and Max 3 has a molecular weight half that of Max 1. The size of the replicon is comparable to that obtained by others. Inferences were drawn regarding the structure of chromatin and the role of the distribution of sites hypersensitive to methylation with respect to the oncogenes.
Show less - Date Issued
- 1985
- PURL
- http://purl.flvc.org/fcla/dt/14260
- Subject Headings
- Carcinogenicity testing, Cancer--Genetic aspects, DNA
- 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
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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.
Show less - Date Issued
- 1989
- PURL
- http://purl.flvc.org/fcla/dt/14571
- Subject Headings
- Biology, Microbiology
- Format
- Document (PDF)