Alec Maule, Ph.D.
Alec is a Research Physiologist Emeritus for the USGS, Columbia River Research Laboratory.
Science and Products
Filter Total Items: 65
Gas bubble disease in resident fish below Grand Coulee Dam
Abstract not available
Authors
D.A. Venditti, T.C. Robinson, J.W. Beeman, A.G. Maule
Phylogenetic sequence analysis, recombinant expression, and tissue distribution of a channel catfish estrogen receptor beta
An estrogen receptor β (ERβ) cDNA fragment was amplified by RT-PCR of total RNAextracted from liver and ovary of immature channel catfish. This cDNA fragment was used to screen an ovarian cDNA library made from an immature female fish. A clone was obtained that contained an open reading frame encoding a 575-amino-acid protein with a deduced molecular weight of 63.9 kDa. Maximum parsimony and Neig
Authors
Zhenfang Xia, William L. Gale, Xiaotian Chang, David Langenau, Reynaldo Patiño, Alec G. Maule, Llewellyn D. Densmore
Interaction of infection with Renibacterium salmoninarum and physical stress in juvenile chinook salmon: Physiological responses, disease progression, and mortality
We experimentally infected juvenile spring chinook salmon Oncorhynchus tshawytscha with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), in order to compare the physiological responses of Rs-infected and Rs-noninfected fish to a series of multiple, acute stressors and to determine whether exposure to these stressors worsens the infection and leads to increase
Authors
M.G. Mesa, A.G. Maule, C.B. Schreck
Preliminary study of gill NA+,K+-ATPase activity in juvenile spring chinook salmon following electroshock or handling stress
We compared gill Na+,K+-ATPase in subyearling and yearling spring chinook salmon Oncorhynchus tshawytscha 3 h, 24 h, and 7 d after exposure to either a short pulsed DC electroshock (300 V, 50 Hz, 8-ms pulse duration) or an acute handling stress. Mean gill Na+,K+-ATPase values ranged from 7.5 to 11.8 ??mol inorganic phosphate (Pi) ?? (mg protein)-1 ?? h-1. No significant differences were detected,
Authors
S. P. VanderKooi, William L. Gale, A.G. Maule
Assessment of smolt condition for travel time analysis. Summary report 1999
Abstract not available
Authors
R. M. Schrock, S. P. VanderKooi, A.G. Maule, J.W. Beeman, R.E. Reagan, K.M. Hans
Novel transcripts of the estrogen receptor α gene in channel catfish
Complementary DNA libraries from liver and ovary of an immature female channel catfish were screened with a homologous ERα cDNA probe. The hepatic library yielded two new channel catfish ER cDNAs that encode N-terminal ERα variants of different sizes. Relative to the catfish ERα (medium size; 581 residues) previously reported, these new cDNAs encode Long-ERα (36 residues longer) and Short-ERα (389
Authors
Reynaldo Patiño, Zhenfang Xia, William L. Gale, Chunfa Wu, Alec G. Maule, Xiaotian Chang
Progression and severity of gas bubble trauma in juvenile salmonids
We conducted laboratory experiments to assess the progression and to quantify the severity of signs of gas bubble trauma (GBT) in juvenile chinook salmon Oncorhynchus tshawytscha and steelhead Oncorhynchus mykiss exposed to different levels of total dissolved gas (TDG), and we attempted to relate these signs to the likelihood of mortality. When fish were exposed to 110% TDG for up to 22 d, no fish
Authors
M.G. Mesa, L.K. Weiland, A.G. Maule
Prevalence of Renibacterium salmoninarum in juvenile spring chinook salmon at Columbia and Snake river hatcheries, 1993-1996
We monitored the prevalence and severity of Renibacterium salmoninarum (RS) infections in juvenile hatchery spring chinook salmon Oncorhynchus tshawytscha at eight Columbia and Snake river hatcheries from 1993 through 1996. This study followed a prior study that monitored RS in the same hatcheries from 1988 through 1992. In the current study, we found that the prevalence of RS-positive fish declin
Authors
S. P. VanderKooi, A.G. Maule
Cloning, in Vitro expression, and novel phylogenetic classification of a channel catfish estrogen receptor
We obtained two channel catfish estrogen receptor (ccER) cDNA from liver of female fish using RT–PCR. The two fragments were identical in sequence except that the smaller one had an out-of-frame deletion in the E domain, suggesting the existence of ccER splice variants. The larger fragment was used to screen a cDNA library from liver of a prepubescent female. A cDNA was obtained that encoded a 581
Authors
Z. Xia, R. Patino, W.L. Gale, A.G. Maule, L.D. Densmore
Gas bubble trauma monitoring and research of juvenile salmonids
Abstract not available
Authors
A.G. Maule, J.W. Beeman, M.G. Mesa, K.M. Hans, T.C. Robinson, S. P. VanderKooi, P.V. Haner, L. Weiland
Gas bubble disease monitoring and research of juvenile salmonids, 1998
No abstract available.
Authors
J.W. Beeman, T.C. Robinson, P.V. Haner, S. P. VanderKooi, A.G. Maule
Rate of disappearance of gas bubble trauma signs in juvenile salmonids
To assess the rate of disappearance of gas bubble trauma (GBT) signs in juvenile salmonids, we exposed spring chinook salmon Oncorhynchus tshawytscha and steelhead O. mykiss to water containing high levels of dissolved gas supersaturation (DGS) for a time period sufficient to induce signs of GBT, reduced the DGS to minimal levels, and then sampled fish through time to document changes in severity
Authors
K.M. Hans, M.G. Mesa, A.G. Maule
Science and Products
Filter Total Items: 65
Gas bubble disease in resident fish below Grand Coulee Dam
Abstract not available
Authors
D.A. Venditti, T.C. Robinson, J.W. Beeman, A.G. Maule
Phylogenetic sequence analysis, recombinant expression, and tissue distribution of a channel catfish estrogen receptor beta
An estrogen receptor β (ERβ) cDNA fragment was amplified by RT-PCR of total RNAextracted from liver and ovary of immature channel catfish. This cDNA fragment was used to screen an ovarian cDNA library made from an immature female fish. A clone was obtained that contained an open reading frame encoding a 575-amino-acid protein with a deduced molecular weight of 63.9 kDa. Maximum parsimony and Neig
Authors
Zhenfang Xia, William L. Gale, Xiaotian Chang, David Langenau, Reynaldo Patiño, Alec G. Maule, Llewellyn D. Densmore
Interaction of infection with Renibacterium salmoninarum and physical stress in juvenile chinook salmon: Physiological responses, disease progression, and mortality
We experimentally infected juvenile spring chinook salmon Oncorhynchus tshawytscha with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), in order to compare the physiological responses of Rs-infected and Rs-noninfected fish to a series of multiple, acute stressors and to determine whether exposure to these stressors worsens the infection and leads to increase
Authors
M.G. Mesa, A.G. Maule, C.B. Schreck
Preliminary study of gill NA+,K+-ATPase activity in juvenile spring chinook salmon following electroshock or handling stress
We compared gill Na+,K+-ATPase in subyearling and yearling spring chinook salmon Oncorhynchus tshawytscha 3 h, 24 h, and 7 d after exposure to either a short pulsed DC electroshock (300 V, 50 Hz, 8-ms pulse duration) or an acute handling stress. Mean gill Na+,K+-ATPase values ranged from 7.5 to 11.8 ??mol inorganic phosphate (Pi) ?? (mg protein)-1 ?? h-1. No significant differences were detected,
Authors
S. P. VanderKooi, William L. Gale, A.G. Maule
Assessment of smolt condition for travel time analysis. Summary report 1999
Abstract not available
Authors
R. M. Schrock, S. P. VanderKooi, A.G. Maule, J.W. Beeman, R.E. Reagan, K.M. Hans
Novel transcripts of the estrogen receptor α gene in channel catfish
Complementary DNA libraries from liver and ovary of an immature female channel catfish were screened with a homologous ERα cDNA probe. The hepatic library yielded two new channel catfish ER cDNAs that encode N-terminal ERα variants of different sizes. Relative to the catfish ERα (medium size; 581 residues) previously reported, these new cDNAs encode Long-ERα (36 residues longer) and Short-ERα (389
Authors
Reynaldo Patiño, Zhenfang Xia, William L. Gale, Chunfa Wu, Alec G. Maule, Xiaotian Chang
Progression and severity of gas bubble trauma in juvenile salmonids
We conducted laboratory experiments to assess the progression and to quantify the severity of signs of gas bubble trauma (GBT) in juvenile chinook salmon Oncorhynchus tshawytscha and steelhead Oncorhynchus mykiss exposed to different levels of total dissolved gas (TDG), and we attempted to relate these signs to the likelihood of mortality. When fish were exposed to 110% TDG for up to 22 d, no fish
Authors
M.G. Mesa, L.K. Weiland, A.G. Maule
Prevalence of Renibacterium salmoninarum in juvenile spring chinook salmon at Columbia and Snake river hatcheries, 1993-1996
We monitored the prevalence and severity of Renibacterium salmoninarum (RS) infections in juvenile hatchery spring chinook salmon Oncorhynchus tshawytscha at eight Columbia and Snake river hatcheries from 1993 through 1996. This study followed a prior study that monitored RS in the same hatcheries from 1988 through 1992. In the current study, we found that the prevalence of RS-positive fish declin
Authors
S. P. VanderKooi, A.G. Maule
Cloning, in Vitro expression, and novel phylogenetic classification of a channel catfish estrogen receptor
We obtained two channel catfish estrogen receptor (ccER) cDNA from liver of female fish using RT–PCR. The two fragments were identical in sequence except that the smaller one had an out-of-frame deletion in the E domain, suggesting the existence of ccER splice variants. The larger fragment was used to screen a cDNA library from liver of a prepubescent female. A cDNA was obtained that encoded a 581
Authors
Z. Xia, R. Patino, W.L. Gale, A.G. Maule, L.D. Densmore
Gas bubble trauma monitoring and research of juvenile salmonids
Abstract not available
Authors
A.G. Maule, J.W. Beeman, M.G. Mesa, K.M. Hans, T.C. Robinson, S. P. VanderKooi, P.V. Haner, L. Weiland
Gas bubble disease monitoring and research of juvenile salmonids, 1998
No abstract available.
Authors
J.W. Beeman, T.C. Robinson, P.V. Haner, S. P. VanderKooi, A.G. Maule
Rate of disappearance of gas bubble trauma signs in juvenile salmonids
To assess the rate of disappearance of gas bubble trauma (GBT) signs in juvenile salmonids, we exposed spring chinook salmon Oncorhynchus tshawytscha and steelhead O. mykiss to water containing high levels of dissolved gas supersaturation (DGS) for a time period sufficient to induce signs of GBT, reduced the DGS to minimal levels, and then sampled fish through time to document changes in severity
Authors
K.M. Hans, M.G. Mesa, A.G. Maule