Blood perfusion of the kidney of<i>Lophius piscatorius</i>L. IV. Magnesium excretion

Brull, L; Cuypers, Y

doi:10.1017/s0025315400008857

Cited by 5 publications

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“…On this basis the serum Mg of Latimeria would be of the order of 7.3 meq/ liter, giving a ratio of 1:4 for hemolyzed serum Mg to aqueous-humor Mg. Even Itheln the concentration is high, either for an elasmobranch oar for a teleost, although very high values have been reported in stressed specimens of the gooslefish Lophius piscatorius(13).…”

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Serum Osmolality in the Coelacanth, Latimeria chalumnae : Urea Retention and Ion Regulation

Pickford

Grant

1967

Science

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Samples of blood (hemolyzed) were obtained from the renal vein, the hepatic portal vein, and the heart of a freshly thawed specimen of Latimeria chalumnae. The coelacanth uses high concentrations of urea to maintain its serum osmolality at approximately that of sea water. The mean value for the total osmolality was 1181 milliosmoles per liter. The mean values (milliequivalents per liter) were: for sodium, 181; for potassium, 51.3; for calcium, 6.9; for magnesium, 28.7; for chloride, 199; and for bicarbonate, 4.7. The mean urea concentration was 355 millimoles per liter, and the mean nonprotein nitrogen was 1343 milligrams percent. Heart blood showed significantly lower values for osmolality (921 milliosmoles per liter) and nonprotein nitrogen (1030 mg percent) and was probably less severely contaminated with products of protein breakdown. Fluid from the anterior chamber of the eye showed values of 952 milliosmole/liter; the urea value for this fluid was 303 mmole/liter, and the magnesium was 7.3 meq/liter. The magnesium value for the aqueous humor was used to correct the abnormally high concentrations in the hemolyzed serum. The high level of serum potassium also was attributed to hemolysis.

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Serum Osmolality in the Coelacanth, Latimeria chalumnae : Urea Retention and Ion Regulation

Pickford

Grant

1967

Science

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Excretion and ultrastructure of the antennal gland of the fiddler crab Uca mordax

Schmidt‐Nielsen

Gertz

Davis

1968

Journal of Morphology

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Function and ultrastructure of the excretory organs (antennal glands) of the shore crab U c a m o r d a x were investigated. The crabs were maintained at three different salinities: 50%, 100% and 200% seawater. In spite of previous reports to the contrary, the investigation showed that the powerful osmoregulatory ability found in Uca m o r d a x is not due to participation of the antennal glands. Freezing point depression of urine under all conditions was found to be slightly less than that of the hemolymph, indicating a slightly hypoosmotic urine. It was further found that the antennal gland is extremely effective in resorbing sodium from the filtrate. The higher the salinity to which the crabs were acclimated the lower the sodium concentration in the urine. No water was resorbed from the filtrate as shown by the fact that the inulin U / P ratio remained unity regardless of the salinity to which the crabs were adapted. Electronmicroscopy of the antennal glands revealed that the coelomosac cells are similar to the podocytes described in the crayfish by Kummel ('64), and the coelomosac appears to be a typical filtration organ. The cells of the labyrinth showed brush border and very elaborate basal infoldings with numerous mitochondria. The deep cytoplasmic infoldings which represent interdigitations with neighboring cells may be correlated with the effective sodium reabsorption in the labyrinth, but apparently not with water movement.The combination of physiologic with electron microscopic investigations have become increasingly important in the current attempts to understand how solutes and water are transported across biological membranes. The purpose of the present investigation was to compare the structuralfunctional relationship of the excretory organ, the antennal gland, of a shore crab, Uca, with that of the excretory organs of other invertebrates and vertebrates. Uca, and other shore crabs were of particular interest mainly because of the claim that the urine, under certain conditions was hyperosmotic to the hemolymph. Riegel and Lockwood ('61), found that the urine osmolality of Carcinus maenas exceeded the hemolymph osmolality by about 3% after four days of dehydration. In Uca p u g n a x the urine osmolality was 10 to 20% higher than the hemolymph when the crabs had been exposed for 2 to 3 days to 100 or 175% seawater (Green et al., '59). The fiddler crab Uca. mordax was selected for the present study, because it lives in salt pools in which the salinity for several months of the year is 2 to 3 times the salinity of seawater. Therefore it seemed J. MORPH., 125: 473-496. that if relatives of Uca mordax were able to produce a hyperosmotic urine, this animal should be at least as effective.Each of the paired antennal glands of the crabs consists of a coelomosac followed by a labyrinth, or single tubule which leads into the bladder ( fig. 1 ) . In the crayfish a nephridial canal is found between the labyrinth and the bladder. According to Grobben (1880) a nephridial canal is present only in fres...

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Physiology of the kidney

Wesson¹

1965

Handbuch Der Urologie / Encyclopedia of Urology / Encyclopédie D’urologie

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Blood perfusion of the kidney ofLophius piscatoriusL. IV. Magnesium excretion

Cited by 5 publications

References 4 publications

Serum Osmolality in the Coelacanth, Latimeria chalumnae : Urea Retention and Ion Regulation

Serum Osmolality in the Coelacanth, Latimeria chalumnae : Urea Retention and Ion Regulation

Excretion and ultrastructure of the antennal gland of the fiddler crab Uca mordax

Physiology of the kidney

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