Christine Densmore (Former Employee)
Science and Products
Filter Total Items: 44
Histopathology of repeated, intermittent exposure of chloramine-T to walleye (Sander vitreum) and (Ictalurus punctalus) channel catfish Histopathology of repeated, intermittent exposure of chloramine-T to walleye (Sander vitreum) and (Ictalurus punctalus) channel catfish
Chloramine-T (Cl-T) has been used safely and effectively to control bacterial gill disease in salmonids at a maximum exposure regimen of up to four consecutive, once-daily exposures administered for 60??min at 20??mg/L. However, data to document safe treatment concentrations of Cl-T are lacking for freshwater-reared fish other than salmonids. We report the histopathology resultant from...
Authors
M.P. Gaikowski, Christine L. Densmore, V. S. Blazer
Diseases of amphibians Diseases of amphibians
The development and refinement of amphibian medicine comprise an ongoing science that reflects the unique life history of these animals and our growing knowledge of amphibian diseases. Amphibians are notoriously fastidious in terms of captive care requirements, and the majority of diseases of amphibians maintained in captivity will relate directly or indirectly to husbandry and...
Authors
Christine L. Densmore, David E. Green
Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management
The purpose of this report is to present a synthesis of the USGS Chesapeake Bay science related to the 2001-06 goals and provide implications for environmental management. The report provides USGS findings that address the science needs of the Chesapeake Bay Program (CBP) restoration goals and includes summaries of 1. land-use change; 2. water quality in the watershed, including...
Authors
Scott W. Ator, Vicki S. Blazer, John W. Brakebill, Donald R. Cahoon, Peter R. Claggett, Thomas M. Cronin, Judith M. Denver, Christine L. Densmore, Allen C. Gellis, Cliff R. Hupp, Jurate M. Landwehr, Michael J. Langland, Christopher A. Ottinger, Milan J. Pavich, Matthew C. Perry, Scott W. Phillips, Stephen D. Preston, Jeff P. Raffensperger, Barnett A. Rattner, Nancy B. Rybicki, Debra A. Willard
Mycobacterial infections in striped bass from Delaware Bay Mycobacterial infections in striped bass from Delaware Bay
Eighty striped bass Morone saxatilis were obtained from Delaware Bay using commercial gill nets set adjacent to Woodland Beach (n = 70) and Bowers Beach (n = 10) in December 2003. Fish were examined for gross lesions. Total lengths (TLs) and eviscerated weights were determined to calculate condition factors (K). Portions of spleens were aseptically harvested for bacterial culture, and...
Authors
C. A. Ottinger, J.J. Brown, Christine L. Densmore, C. E. Starliper, V. S. Blazer, H.S. Weyers, K.A. Beauchamp, M. W. Rhodes, H. Kator, David T. Gauthier, W. K. Vogelbein
Mycobacteriosis in Chesapeake Bay Striped Bass (Morone saxatilis) Mycobacteriosis in Chesapeake Bay Striped Bass (Morone saxatilis)
No abstract available.
Authors
Christopher A. Ottinger, Vicki S. Blazer, Christine L. Densmore, David T. Gauthier, H. Kator, F. M. Panek, M. W. Rhodes, W. Vogelbein
Calcein AM release-based cytotoxic cell assay for fish leucocytes Calcein AM release-based cytotoxic cell assay for fish leucocytes
A non-specific cytotoxic cell assay for fish is presented that is based on the release of the activated fluorochrome calcein AM from lysed carp epithelioma papulosum cyprini (EPC) cells. To establish the suitability of treating EPC cells with calcein AM the uptake and spontaneous release of the calcein AM by the EPC cells was evaluated. Incubation of 5 μM calcein AM in culture medium...
Authors
Luke R. Iwanowicz, Christine L. Densmore, Christopher A. Ottinger
Comparative susceptibility of Atlantic salmon, lake trout and rainbow trout to Myxobolus cerebralis in controlled laboratory exposures Comparative susceptibility of Atlantic salmon, lake trout and rainbow trout to Myxobolus cerebralis in controlled laboratory exposures
The susceptibility of lake trout Salvelinus namaycush, rainbow trout Oncorhynchus mykiss and Atlantic salmon Salmo salar to Myxobolus cerebralis, the causative agent of whirling disease, was compared in controlled laboratory exposures. A total of 450 (225 for each dose) fry for each species were exposed to a low (200 spores per fish) or high (2000 spores per fish) dose of the infective
Authors
V. S. Blazer, Christine L. Densmore, W. B. Schill, Deborah D. Cartwright, S.J. Page
Immunomodulation and disease resistance in postyearling rainbow trout infected with Myxobolus cerebralis, the causative agent of whirling disease Immunomodulation and disease resistance in postyearling rainbow trout infected with Myxobolus cerebralis, the causative agent of whirling disease
Myxobolus cerebralis, the myxosporean parasite that causes whirling disease, has a number of deleterious effects on its salmonid host. Although it is well established that juvenile salmonids in the active stages of whirling disease mount an immune response to the pathogen, the occurrence and longevity of any related immunomodulatory effects are unknown. In this study, postyearling...
Authors
Christine L. Densmore, Christopher A. Ottinger, Vicki S. Blazer, Luke R. Iwanowicz, D. R. Smith
Effects of water temperature and substrate type on spore production and release in eastern Tubifex tubifex worms infected with Myxobolus cerebralis Effects of water temperature and substrate type on spore production and release in eastern Tubifex tubifex worms infected with Myxobolus cerebralis
Eastern Tubifex tubifex worms were exposed to Myxobolus cerebralis spores at 9, 13, 17, and 20 C in 1-L jars that contained sand, mud, or leaf litter as substrata. Beginning 60 days after exposure, water from each jar was filtered daily and examined for the presence of waterborne triactinomyxon spores (TAMs). On discovering a single TAM from an experimental jar, 48 T. tubifex worms from...
Authors
V. S. Blazer, T.B. Waldrop, W. B. Schill, Christine L. Densmore, D. Smith
Measurement of in vitro leucocyte mitogenesis in fish: ELISA based detection of the thymidine analogue 5'-bromo-2'-deoxyuridine Measurement of in vitro leucocyte mitogenesis in fish: ELISA based detection of the thymidine analogue 5'-bromo-2'-deoxyuridine
In this study we present a method for the measurement of in vitro mitogenesis in fish leucocytes that is based on the incorporation of the thymidine analogue 5′-bromo-2′-deoxyuridine (BrdU) into the DNA of replicating cells, followed by ELISA-based detection. This technique, adapted from methods developed for mammalian cells, operates on a similar biological principle to 3H-thymidine...
Authors
David T. Gauthier, Deborah D. Cartwright, Christine L. Densmore, Vicki Blazer, Christopher A. Ottinger
Aphanomyces invadans in Atlantic Menhaden along the East Coast of the United States Aphanomyces invadans in Atlantic Menhaden along the East Coast of the United States
The cause of deeply penetrating ulcers of Atlantic menhaden Brevoortia tyrannus has been the subject of significant research efforts in recent years. These lesions and the associated syndrome termed ulcerative mycosis have been observed along the East Coast of the United States since at least the early 1980s. Although Aphanomyces spp. were isolated from these lesions in the mid to late...
Authors
Vicki S. Blazer, J. H. Lilley, W. B. Schill, Y. Kiryu, Christine L. Densmore, V. Panyawachira, S. Chinabut
Reproductive biomarkers Reproductive biomarkers
No abstract available at this time
Authors
Gross T. S. McDonald K, N. D. Denslow, Christine L. Densmore, V. S. Blazer, B.S. Arnold
Science and Products
Filter Total Items: 44
Histopathology of repeated, intermittent exposure of chloramine-T to walleye (Sander vitreum) and (Ictalurus punctalus) channel catfish Histopathology of repeated, intermittent exposure of chloramine-T to walleye (Sander vitreum) and (Ictalurus punctalus) channel catfish
Chloramine-T (Cl-T) has been used safely and effectively to control bacterial gill disease in salmonids at a maximum exposure regimen of up to four consecutive, once-daily exposures administered for 60??min at 20??mg/L. However, data to document safe treatment concentrations of Cl-T are lacking for freshwater-reared fish other than salmonids. We report the histopathology resultant from...
Authors
M.P. Gaikowski, Christine L. Densmore, V. S. Blazer
Diseases of amphibians Diseases of amphibians
The development and refinement of amphibian medicine comprise an ongoing science that reflects the unique life history of these animals and our growing knowledge of amphibian diseases. Amphibians are notoriously fastidious in terms of captive care requirements, and the majority of diseases of amphibians maintained in captivity will relate directly or indirectly to husbandry and...
Authors
Christine L. Densmore, David E. Green
Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management
The purpose of this report is to present a synthesis of the USGS Chesapeake Bay science related to the 2001-06 goals and provide implications for environmental management. The report provides USGS findings that address the science needs of the Chesapeake Bay Program (CBP) restoration goals and includes summaries of 1. land-use change; 2. water quality in the watershed, including...
Authors
Scott W. Ator, Vicki S. Blazer, John W. Brakebill, Donald R. Cahoon, Peter R. Claggett, Thomas M. Cronin, Judith M. Denver, Christine L. Densmore, Allen C. Gellis, Cliff R. Hupp, Jurate M. Landwehr, Michael J. Langland, Christopher A. Ottinger, Milan J. Pavich, Matthew C. Perry, Scott W. Phillips, Stephen D. Preston, Jeff P. Raffensperger, Barnett A. Rattner, Nancy B. Rybicki, Debra A. Willard
Mycobacterial infections in striped bass from Delaware Bay Mycobacterial infections in striped bass from Delaware Bay
Eighty striped bass Morone saxatilis were obtained from Delaware Bay using commercial gill nets set adjacent to Woodland Beach (n = 70) and Bowers Beach (n = 10) in December 2003. Fish were examined for gross lesions. Total lengths (TLs) and eviscerated weights were determined to calculate condition factors (K). Portions of spleens were aseptically harvested for bacterial culture, and...
Authors
C. A. Ottinger, J.J. Brown, Christine L. Densmore, C. E. Starliper, V. S. Blazer, H.S. Weyers, K.A. Beauchamp, M. W. Rhodes, H. Kator, David T. Gauthier, W. K. Vogelbein
Mycobacteriosis in Chesapeake Bay Striped Bass (Morone saxatilis) Mycobacteriosis in Chesapeake Bay Striped Bass (Morone saxatilis)
No abstract available.
Authors
Christopher A. Ottinger, Vicki S. Blazer, Christine L. Densmore, David T. Gauthier, H. Kator, F. M. Panek, M. W. Rhodes, W. Vogelbein
Calcein AM release-based cytotoxic cell assay for fish leucocytes Calcein AM release-based cytotoxic cell assay for fish leucocytes
A non-specific cytotoxic cell assay for fish is presented that is based on the release of the activated fluorochrome calcein AM from lysed carp epithelioma papulosum cyprini (EPC) cells. To establish the suitability of treating EPC cells with calcein AM the uptake and spontaneous release of the calcein AM by the EPC cells was evaluated. Incubation of 5 μM calcein AM in culture medium...
Authors
Luke R. Iwanowicz, Christine L. Densmore, Christopher A. Ottinger
Comparative susceptibility of Atlantic salmon, lake trout and rainbow trout to Myxobolus cerebralis in controlled laboratory exposures Comparative susceptibility of Atlantic salmon, lake trout and rainbow trout to Myxobolus cerebralis in controlled laboratory exposures
The susceptibility of lake trout Salvelinus namaycush, rainbow trout Oncorhynchus mykiss and Atlantic salmon Salmo salar to Myxobolus cerebralis, the causative agent of whirling disease, was compared in controlled laboratory exposures. A total of 450 (225 for each dose) fry for each species were exposed to a low (200 spores per fish) or high (2000 spores per fish) dose of the infective
Authors
V. S. Blazer, Christine L. Densmore, W. B. Schill, Deborah D. Cartwright, S.J. Page
Immunomodulation and disease resistance in postyearling rainbow trout infected with Myxobolus cerebralis, the causative agent of whirling disease Immunomodulation and disease resistance in postyearling rainbow trout infected with Myxobolus cerebralis, the causative agent of whirling disease
Myxobolus cerebralis, the myxosporean parasite that causes whirling disease, has a number of deleterious effects on its salmonid host. Although it is well established that juvenile salmonids in the active stages of whirling disease mount an immune response to the pathogen, the occurrence and longevity of any related immunomodulatory effects are unknown. In this study, postyearling...
Authors
Christine L. Densmore, Christopher A. Ottinger, Vicki S. Blazer, Luke R. Iwanowicz, D. R. Smith
Effects of water temperature and substrate type on spore production and release in eastern Tubifex tubifex worms infected with Myxobolus cerebralis Effects of water temperature and substrate type on spore production and release in eastern Tubifex tubifex worms infected with Myxobolus cerebralis
Eastern Tubifex tubifex worms were exposed to Myxobolus cerebralis spores at 9, 13, 17, and 20 C in 1-L jars that contained sand, mud, or leaf litter as substrata. Beginning 60 days after exposure, water from each jar was filtered daily and examined for the presence of waterborne triactinomyxon spores (TAMs). On discovering a single TAM from an experimental jar, 48 T. tubifex worms from...
Authors
V. S. Blazer, T.B. Waldrop, W. B. Schill, Christine L. Densmore, D. Smith
Measurement of in vitro leucocyte mitogenesis in fish: ELISA based detection of the thymidine analogue 5'-bromo-2'-deoxyuridine Measurement of in vitro leucocyte mitogenesis in fish: ELISA based detection of the thymidine analogue 5'-bromo-2'-deoxyuridine
In this study we present a method for the measurement of in vitro mitogenesis in fish leucocytes that is based on the incorporation of the thymidine analogue 5′-bromo-2′-deoxyuridine (BrdU) into the DNA of replicating cells, followed by ELISA-based detection. This technique, adapted from methods developed for mammalian cells, operates on a similar biological principle to 3H-thymidine...
Authors
David T. Gauthier, Deborah D. Cartwright, Christine L. Densmore, Vicki Blazer, Christopher A. Ottinger
Aphanomyces invadans in Atlantic Menhaden along the East Coast of the United States Aphanomyces invadans in Atlantic Menhaden along the East Coast of the United States
The cause of deeply penetrating ulcers of Atlantic menhaden Brevoortia tyrannus has been the subject of significant research efforts in recent years. These lesions and the associated syndrome termed ulcerative mycosis have been observed along the East Coast of the United States since at least the early 1980s. Although Aphanomyces spp. were isolated from these lesions in the mid to late...
Authors
Vicki S. Blazer, J. H. Lilley, W. B. Schill, Y. Kiryu, Christine L. Densmore, V. Panyawachira, S. Chinabut
Reproductive biomarkers Reproductive biomarkers
No abstract available at this time
Authors
Gross T. S. McDonald K, N. D. Denslow, Christine L. Densmore, V. S. Blazer, B.S. Arnold
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government