The synaptic ribbons of the guinea-pig pineal gland under normal and experimental conditions

1973 ◽  
Vol 139 (3) ◽  
pp. 417-429 ◽  
Author(s):  
L. Vollrath ◽  
H. Huss
Keyword(s):  
Guinea Pig ◽  
Pineal Gland ◽  
Synaptic Ribbons ◽  
Experimental Conditions

Prenatal development of ?synaptic? ribbons in the guinea pig pineal gland

1990 ◽  
Vol 187 (1) ◽  
pp. 39-54 ◽  
Author(s):  
Z. R. Luo ◽  
R. L. Schultz ◽  
E. F. Whitter ◽  
L. Vollrath
Keyword(s):  
Guinea Pig ◽  
Pineal Gland ◽  
Prenatal Development ◽  
Synaptic Ribbons

?Synaptic? ribbons and spherules of the guinea pig pineal gland: Inverse day/night differences in number

1983 ◽  
Vol 168 (1) ◽  
pp. 67-74 ◽  
Author(s):  
L. Vollrath ◽  
R. L. Schultz ◽  
P. J. McMillan
Keyword(s):  
Guinea Pig ◽  
Pineal Gland ◽  
Synaptic Ribbons

Postnatal development of ?Synaptic? ribbons and spherules in the guinea pig pineal gland

1985 ◽  
Vol 173 (1) ◽  
pp. 43-53 ◽  
Author(s):  
J. C. Banks ◽  
A. E. Dalgleish ◽  
L. Vollrath
Keyword(s):  
Guinea Pig ◽  
Pineal Gland ◽  
Postnatal Development ◽  
Synaptic Ribbons

Effect of pinealectomy on the testicular response of the freshwater snake Natrix piscator to different environmental factors

1989 ◽  
Vol 67 (10) ◽  
pp. 2352-2357 ◽  
Author(s):  
C. Haldar ◽  
R. Pandey
Keyword(s):  
High Temperature ◽  
Pineal Gland ◽  
High Humidity ◽  
Testicular Function ◽  
Experimental Conditions ◽  
Gland Weight ◽  
Tropical Water ◽  
Water Snake ◽  
Temperature Regimes ◽  
Testicular Weight

The effects of different humidity, photoperiod, and temperature regimes on the testicular function of the tropical water snake Natrix piscator were investigated in both sham-operated and pinealectomized snakes. Moderate humidity (50 ± 5%) had no effect on the testis, but high humidity (85 ± 5%) increased the testicular weight and activity of sham-operated snakes after 3, 6, and 9 weeks. Exposures to 14L:10D or 24L:0D and high temperature (42 ± 2 °C) inhibited testicular weight and activity in sham-operated snakes, whereas exposure to 10L:14D or 0L:24D and a low temperature (20 ± 2 °C) had no effect. Pinealectomized snakes did not respond to any of these experimental conditions, but their testicular weight remained the same as that of the pinealectomized controls under natural environmental conditions. The pineal gland showed an opposite response to that of the testes. Pineal gland weight decreased under high humidity and increased under 14L:10D, 24L:0D, and high temperature. These findings suggest that the ecofactors humidity, photoperiod, and temperature play a role in the regulation of testicular function in this snake, and that the pineal gland is implicated in the mediation of these factors.

Delayed rectification in single cells isolated from guinea pig sinoatrial node

1992 ◽  
Vol 262 (3) ◽  
pp. H921-H925 ◽  
Author(s):  
J. M. Anumonwo ◽  
L. C. Freeman ◽  
W. M. Kwok ◽  
R. S. Kass
Keyword(s):  
Guinea Pig ◽  
Sinoatrial Node ◽  
Single Cells ◽  
Equilibrium Potential ◽  
Delayed Rectifier ◽  
Experimental Conditions ◽  
Whole Cell ◽  
Voltage Range ◽  
Whole Cell Patch Clamp ◽  
Delayed Rectification

We have studied delayed rectifier K+ currents (IK) in cells isolated from the sinoatrial node (SAN) region of the guinea pig. Using whole cell patch-clamp procedures, we measured the voltage dependence of IK activation and IK kinetics and the IK equilibrium potential in 4.8 mM extracellular K concentration solutions. Experiments were designed to contrast properties of guinea pig SAN IK with those of IK recorded from SAN cells of the rabbit. We find that guinea pig SAN IK differs from IK recorded from single rabbit SAN cells in its activation threshold, and in the absence of inactivation of whole cell currents recorded over a wide voltage range. These results, along with the relative insensitivity of guinea pig SAN IK to E-4031 and lanthanum, suggest that under our experimental conditions, a strongly rectifying IK component (IK,r) is not the major component of delayed rectification in the guinea pig SAN, as it appears to be in SAN cells of the rabbit.

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