Frequency discrimination in the goldfish (Carassius auratus): Effects of roving intensity, sensation level, and the direction of frequency change

1989 ◽  
Vol 85 (1) ◽  
pp. 503-505 ◽  
Author(s):  
Richard R. Fay
Keyword(s):  
Carassius Auratus ◽  
Frequency Discrimination ◽  
Frequency Change ◽  
Sensation Level ◽  
Goldfish Carassius Auratus

Low-Frequency Vowel Formant Discrimination in Hearing-Impaired Listeners

1970 ◽  
Vol 13 (2) ◽  
pp. 347-359 ◽  
Author(s):  
J. M. Pickett ◽  
J. Mártony
Keyword(s):  
Low Frequency ◽  
Discrimination Performance ◽  
Frequency Discrimination ◽  
Auditory Discrimination ◽  
Frequency Change ◽  
Adaptive Procedure ◽  
Sensation Level ◽  
Formant Frequency ◽  
Vowel Formant ◽  
Measure Of Discrimination

Measurements of vowel formant discrimination were made on 6 listeners with severe-to-profound sensorineural hearing losses and compared with discrimination in 4 normal listeners. The measure of discrimination was the size of the threshold for a frequency change in the formant of a synthetic vowel. An adaptive procedure was used to locate threshold. Results indicated that, at two low formant locations, 205 and 275 Hz, sensorineural discrimination was equal to normal; at 400 and 875 Hz, however, the sensorineural subjects had less discrimination than normal. Learning to maximum discrimination performance was slow for the sensorineural subjects at the two higher formant locations. Formant frequency discrimination appeared to be insensitive to changes in sensation level. Tactual discrimination tests with the vowel stimuli indicated that the obtained performance levels for very poor discrimination may have reflected tactual discrimination rather than auditory discrimination.

SEM of Hepatocytes and Biliary Passages in Goldfish Liver

1977 ◽  
Vol 35 ◽  
pp. 556-557
Author(s):  
Waykin Nopanitaya ◽  
Joe W. Grisham ◽  
Johnny L. Carson
Keyword(s):  
Carassius Auratus ◽  
Cell Layer ◽  
Three Dimensional ◽  
Cell Types ◽  
Biliary System ◽  
Fish Food ◽  
Commercial Fish ◽  
Goldfish Carassius Auratus ◽  
Commercial Fish Food

An interesting feature of the goldfish liver is the morphology of the hepatic plate, which is always formed by a two-cell layer of hepatocytes. Hepatic plates of the goldfish liver contain an infrequently seen second type of cell, in the centers of plates between two hepatocytes. A TEH study by Yamamoto (1) demonstrated ultrastructural differences between hepatocytes and centrally located cells in hepatic plates; the latter were classified as ductule cells of the biliary system. None of the previous studies clearly showed a three-dimensional organization of the two cell types described. In the present investigation we utilize SEM to elucidate the arrangement of hepatocytes and bile ductular cells in intralobular plates of goldfish liver.Livers from young goldfish (Carassius auratus), about 6-10 cm, fed commercial fish food were used for this study. Hepatic samples were fixed in 4% buffered paraformaldehyde, cut into pieces, fractured, osmicated, CPD, mounted Au-Pd coated, and viewed by SEM at 17-20 kV. Our observations were confined to the ultrastructure of biliary passages within intralobular plates, ductule cells, and hepatocytes.

Induction of Gynogenesis and Androgenesis in Goldfish Carassius auratus (var. oranda)

2001 ◽  
Vol 36 (3-4) ◽  
pp. 195-198 ◽  
Author(s):  
I Paschos ◽  
L Natsis ◽  
C Nathanailides ◽  
I Kagalou ◽  
E Kolettas
Keyword(s):  
Carassius Auratus ◽  
Goldfish Carassius Auratus

Toxicity and deleterious impacts of selenium nanoparticles at supranutritional and imbalance levels on male goldfish (Carassius auratus) sperm

2021 ◽  
Vol 66 ◽  
pp. 126758
Author(s):  
Javad Seyedi ◽  
Mohammad Reza Kalbassi ◽  
Milad Esmaeilbeigi ◽  
Mohammad Behzadi Tayemeh ◽  
Jamshid Amiri Moghadam
Keyword(s):  
Carassius Auratus ◽  
Selenium Nanoparticles ◽  
Goldfish Carassius Auratus
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