Die doppelte motorische Innervation des Scherenschliessers von Astacus fluviatilis

1937 ◽  
Vol 24 (3) ◽  
pp. 381-386
Author(s):  
C. A. G. Wiersma
Keyword(s):  
Astacus Fluviatilis

Sodium Regulation in the Crayfish Astacus Fluviatilis

1960 ◽  
Vol 37 (1) ◽  
pp. 83-99 ◽  
Author(s):  
G. W. BRYAN
Keyword(s):  
Tap Water ◽  
Sodium Concentration ◽  
The Body ◽  
Urine Sodium ◽  
Compartment System ◽  
Single Compartment ◽  
Blood And Urine Samples ◽  
Astacus Fluviatilis ◽  
Sodium Regulation ◽  
Total Sodium

1. In Bristol tap water containing 0.4 mM./l. sodium and artificial tap water containing 2 mM./l. sodium, Astacus maintains a blood sodium concentration of about 203 mM./l. This value was not markedly affected by starvation periods of up to a month. 2. Methods of taking small blood and urine samples from individual crayfish at intervals over several hundred hours have been described. 3. Under steady state conditions, curves for the uptake and loss of 22Na by the blood are described by equations derived for a one-compartment system. 4. The volume of this single compartment, which exchanges sodium with the medium, is larger than the actual blood volume by an amount roughly equivalent to the sodium in the tissues. Exchange of sodium between the blood and tissues is probably very rapid. 5. Sodium losses in the urine account for about 6% of the total sodium outflux found using 22Na. The urine sodium concentration of about 6 mM./l. was temporarily increased by conditions such as heavy feeding when the blood may have gained additional sodium. 6. Potential difference measurements across the body surface indicate that the high blood sodium concentration is maintained by active uptake of sodium.

Astacus fluviatilis. Flußkrebs

1914 ◽  
pp. 183-203
Author(s):  
Paul Röseler ◽  
Hans Lamprecht
Keyword(s):  
Astacus Fluviatilis

Amino acid sequence of crayfish (Astacus fluviatilis) trypsin If

Biochemistry ◽  
1983 ◽  
Vol 22 (6) ◽  
pp. 1459-1465 ◽  
Author(s):  
Koiti Titani ◽  
Tatsuru Sasagawa ◽  
Richard G. Woodbury ◽  
Lowell H. Ericsson ◽  
Herbert Dorsam ◽  
...  
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
Astacus Fluviatilis

Fine Structure of Statocyst Receptor of Astacus fluviatilis

Nature ◽  
1968 ◽  
Vol 220 (5163) ◽  
pp. 184-186 ◽  
Author(s):  
HERMANN SCHÖNE ◽  
R. ALEXANDER STEINBRECHT
Keyword(s):  
Fine Structure ◽  
Astacus Fluviatilis

scholarly journals I. Observations on the physiology of the nervous system of the crayfish (Astacus fluviatilis)

1879 ◽  
Vol 28 (190-195) ◽  
pp. 378-383
Keyword(s):  
Nervous System ◽  
Whole Body ◽  
Injured Side ◽  
Normal Manner ◽  
Astacus Fluviatilis

I. When one of the supra-œsophageal commissures is divided , the whole body of the crayfish on the injured side is more or less enfeebled, with he exception of the swimmerets and possibly the gnathites. The change is most marked in the antennæ and eye-stalks, which barely respond to considerable excitation; and after these perhaps in the abdomen, the power of swimming or turning over being generally entirely lost. The muscles connecting the abdominal segments on the injured side are relaxed, and the tail-fin appendages on that side are no longer spread out in the normal manner, but remain more or less overlapping and hang down like broken limbs.

scholarly journals MICROANATOMY OF THE ABDOMINAL STRETCH RECEPTORS OF THE CRAYFISH (ASTACUS FLUVIATILIS L.)

1955 ◽  
Vol 39 (1) ◽  
pp. 69-85 ◽  
Author(s):  
Elisabeth Florey ◽  
Ernst Florey
Keyword(s):  
Muscle Fibers ◽  
Stretch Receptor ◽  
Physiological Significance ◽  
Histological Findings ◽  
Efferent Innervation ◽  
Stretch Receptors ◽  
Astacus Fluviatilis ◽  
Relationship Of ◽  
The Relationship ◽  
Sensory Endings

Microanatomical studies on the abdominal stretch receptor organs of the crayfish Astacus fluviatilis L. have been carried out in order to establish a basis for the physiological work that has been, and is being carried out on stretch receptors of various species of crayfish. Important differences have been found between these organs and those previously described by Alexandrowicz for the lobsters Homarus vulgaris and Palinurus vulgaris. With the aid of silver-impregnated preparations the relationship of sensory endings and muscle fibers has been shown as well as the pattern of the efferent innervation. The physiological significance of the histological findings has been discussed.

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