Mechanism of pellet egestion in great-horned owls (Bubo virginianus)

To study the mechanism of oral pellet egestion in great-horned owls, bipolar electrodes and strain-gauge transducers were chronically implanted in the esophagus, muscular stomach, and duodenum of six owls. Recordings from conscious owls plus simultaneous radiographic observations revealed characteristic gastrointestinal motility patterns associated with egestion. Beginning at about 12 min before egestion, gastric contractions formed the final shape of the pellet and pushed it into the lower esophagus. The pellet was moved out of the esophagus by antiperistalsis during the last 8--10 s before egestion. During pellet egestion, contractions of abdominal muscles were not detected. Pellet egestion appears to be unlike either emesis in mammals with a simple stomach or regurgitation in ruminants.

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An experimental study of the gastrointestinal motility in conscious dogs with strain gauge force transducers.

Japanese Journal of Smooth Muscle Research ◽

10.1540/jsmr1965.25.97 ◽

1989 ◽

Vol 25 (3) ◽

pp. 97-111

Author(s):

Kenzo KOH

Keyword(s):

Experimental Study ◽

Gastrointestinal Motility ◽

Strain Gauge ◽

Conscious Dogs ◽

Force Transducers

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New Telemetry Device for the Measurement of Gastrointestinal Motility in Rats and Comparison With Standard Equipment

International Surgery ◽

10.9738/intsurg-d-14-00078.1 ◽

2015 ◽

Vol 100 (4) ◽

pp. 755-760

Author(s):

Tobias Meile ◽

Derek Zieker ◽

Alfred Königsrainer ◽

Jörg Glatzle

Keyword(s):

Gastrointestinal Motility ◽

Strain Gauge ◽

Linear Calibration ◽

Standard Equipment ◽

Freely Moving Rats ◽

Calibration Curves ◽

Significant Difference ◽

Freely Moving

To perform stress-free recording of gastrointestinal motility in rats with strain gauge transducers, telemetry equipment had to be developed. We developed, programmed, and tested a new telemetry device that records gastrointestinal motility in freely moving rats using strain gauge transducers. The device can collect and transmit data in freely moving rats. Data are received and stored for later analysis with a regular PC. Linear calibration curves were obtained for the strain gauge transducers used. We compared data obtained with the new telemetry device with data gathered with standard equipment and could not find any statistically significant difference. Wired gastric and colonic contraction frequencies were 4.6 ± 0.3 per minute and 1.5 ± 0.3 per minute, whereas telemetric contraction frequencies were 4.4 ± 0.1 per minute and 1.25 ± 0.1 per minute. The new telemetry device is a very useful tool for the measurement of gastrointestinal motility in rats.

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Effect of denervation on initiation and coordination of gastroduodenal motility in turkeys

AJP Gastrointestinal and Liver Physiology ◽

10.1152/ajpgi.1988.255.1.g1 ◽

1988 ◽

Vol 255 (1) ◽

pp. G1-G6

Author(s):

S. B. Chaplin ◽

G. E. Duke

Keyword(s):

Strain Gauge ◽

Gastric Motility ◽

Sympathetic Nerve ◽

Glandular Stomach ◽

Extrinsic Denervation ◽

Proximal Duodenum ◽

Cephalic Phase ◽

Gastroduodenal Motility ◽

Gastric Contractions ◽

Contraction Cycle

The effect of total extrinsic denervation of the stomach on the rhythmicity and coordination of the gastroduodenal cycle was determined in domestic turkeys. The vagus and two gastric branches of the sympathetic nerve were sectioned at the level of the glandular stomach. Motilities of the glandular stomach, proximal duodenum, and caudal thin muscle of the muscular stomach were monitored via implanted strain gauge transducers for 1 h every other day. Denervation had no significant effect on initiation of contractions or frequency of gastric contractions in fed birds, but fasted birds whose stomachs were extrinsically denervated exhibited significantly slower contractions than controls. In addition, denervation uncoupled the coordination of the duodenal and gastric contractions in the gastroduodenal cycle. Moreover, birds with extrinsically denervated stomachs exhibited a cephalic phase of gastric motility that was significantly delayed in onset compared with controls. These results suggest the existence of both a neural and endocrine component in the avian gastric response to the sight of food. Extrinsic input seems to be an important modulator of gastric motility in birds and is essential for the normal coordination of the gastroduodenal contraction cycle.

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Clinical and experimental studies on gastrointestinal motility following total colectomy: Direct measurement(strain gauge force transducer method, barium method) and indirect measurement(hydrogen breath test, acetaminophen method).

Journal of Smooth Muscle Research ◽

10.1540/jsmr.27.97 ◽

1991 ◽

Vol 27 (2) ◽

pp. 97-114 ◽

Cited By ~ 3

Author(s):

Hitoshi KAYAMA ◽

Kenzo KOH

Keyword(s):

Direct Measurement ◽

Gastrointestinal Motility ◽

Strain Gauge ◽

Breath Test ◽

Total Colectomy ◽

Experimental Studies ◽

Indirect Measurement ◽

Force Transducer ◽

Hydrogen Breath Test ◽

Strain Gauge Force Transducer

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Flexible gastrointestinal motility pressure sensors based on aluminum thin-film strain-gauge arrays

Journal of Micromechanics and Microengineering ◽

10.1088/0960-1317/25/7/074007 ◽

2015 ◽

Vol 25 (7) ◽

pp. 074007 ◽

Cited By ~ 1

Author(s):

L R Silva ◽

P J Sousa ◽

L M Goncalves ◽

G Minas

Keyword(s):

Thin Film ◽

Gastrointestinal Motility ◽

Strain Gauge ◽

Pressure Sensors ◽

Aluminum Thin Film

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The ultrastructure of the abdominal musculature of an orchestid amphipod

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100159862 ◽

1990 ◽

Vol 48 (3) ◽

pp. 464-465

Author(s):

Martin A. Levin ◽

Lisa L. Cale ◽

Valerie Lynch-Holm

Keyword(s):

Intertidal Zone ◽

High Water ◽

Abdominal Muscles ◽

Abdominal Musculature ◽

Dorsal Muscle ◽

High Water Mark ◽

Thoracic Legs ◽

Orchestia Cavimana

Orchestia is a genus of amphipod in the crustacean class Malacostraca. The order Amphipoda contains over 6000 species commonly called side swimmers, scuds and beach fleas(1). Most are marine bottom-dwellers utilizing their thoracic legs and posterior abdominal uropods for walking, crawling and swimming. However, some, like those in the genera Orchestia and Hyale are semiterrestrial. These amphipods, commonly referred to as “beach fleas,' “beach hoppers” or “sand fleas” can hop vigorously for great distances (up to 50 times their length) by extending their abdomens and telsons against the sand(2).In our study, the ultrastructure of the dorsal muscle cord of Orchestia grillus was examined. Vogel(3) described the abdominal muscles of Orchestia cavimana as consisting of two groups of muscles: a strong, complex, dorsal muscle cord used mainly for hopping and a group of weaker, ventral, longitudinal and oblique muscles.The specimens were collected in clumps of decaying seaweed and other detritus from the intertidal zone near the high water mark at Avery Point Beach, Connecticut.

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