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Osmoregulation in the axolotl, Ambys...

Ellis, Tamir M.,

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Osmoregulation in the axolotl, Ambystoma mexicanum /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Osmoregulation in the axolotl, Ambystoma mexicanum // Tamir M Ellis.
作者:	Ellis, Tamir M.,
面頁冊數:	1 electronic resource (109 pages)
附註:	Source: Dissertations Abstracts International, Volume: 52-12, Section: B.
Contained By:	Dissertations Abstracts International52-12B.
標題:	Anatomy & physiology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9116685
ISBN:	9798208328279

Osmoregulation in the axolotl, Ambystoma mexicanum /
Ellis, Tamir M.,

Osmoregulation in the axolotl, Ambystoma mexicanum /Tamir M Ellis. - 1 electronic resource (109 pages)

Source: Dissertations Abstracts International, Volume: 52-12, Section: B.

The influence of temperature and salinity on Na regulation and nitrogen excretion was examined in Ambystoma mexicanum. Changes in plasma and urine Na, NH$\\sb4$, and urea concentration, and the rates of Na influx, efflux and N elimination were measured after acclimation to eight combinations of temperature (5, 15, 25$\\sp\\circ$C) and salinity (1, 10, 100 mM NaCl). Na flux at 15$\\sp\\circ$C is 2.5 $\\mu$Mol/10g.h. Na fluxes at 5 and 25$\\sp\\circ$C are less than the rates at 15$\\sp\\circ$C and increase with salinity. Little Na is lost across the animals' surface at 5$\\sp\\circ$C; and Na permeability tends to be lower in dilute media than in more saline solutions. Na permeability is greatest at 15$\\sp\\circ$C in 100 mM NaCl; but the gradient for Na efflux is small and only ca. 20% of the efflux is via the epithelium. Urine volume has Q$\\sb{10}$s of about 2 over the 5-25$\\sp\\circ$C range. Renal Na loss increases with temperature in 1 and 100 mM NaCl, but is relatively constant in 10 mM. Rates of N excretion increase rapidly from 5 to 15$\\sp\\circ$C with Q$\\sb{10}$s of 3-4; and is less sensitive to temperatures from 15 to 25$\\sp\\circ$C with Q$\\sb{10}$s of 1-2. Ammonium is the chief nitrogenous waste when water turnover is rapid, accounting for ca. 60% of the excreted N. When water turnover is low, axolotls become ureotelic and accumulate urea. The roles of the gills, skin and kidneys in excreting NH$\\sb4$ and urea were examined. Branchial N excretion is 20-30% of the total, and generally slightly more urea than NH$\\sb4$ is excreted at the gills. The skin eliminates from 30-40% of the waste N and appears to be relatively impermeable to urea. The urinary contribution to the total efflux decreases from 30-40% at 5$\\sp\\circ$C, to a small percentage at 25$\\sp\\circ$C when the medium is dilute. Renal excretion of NH$\\sb4$ is always less than 10% of the N efflux.

English

ISBN: 9798208328279Subjects--Topical Terms:

3434423
Anatomy & physiology.
Subjects--Index Terms:

sodium balance

Osmoregulation in the axolotl, Ambystoma mexicanum /
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245 1 0 $a Osmoregulation in the axolotl, Ambystoma mexicanum / $c Tamir M Ellis.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1990
300 $a 1 electronic resource (109 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 52-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisors: Shoemaker, Vaughan H.
502 $b Ph.D. $c University of California, Riverside $d 1990.
520 $a The influence of temperature and salinity on Na regulation and nitrogen excretion was examined in Ambystoma mexicanum. Changes in plasma and urine Na, NH$\\sb4$, and urea concentration, and the rates of Na influx, efflux and N elimination were measured after acclimation to eight combinations of temperature (5, 15, 25$\\sp\\circ$C) and salinity (1, 10, 100 mM NaCl). Na flux at 15$\\sp\\circ$C is 2.5 $\\mu$Mol/10g.h. Na fluxes at 5 and 25$\\sp\\circ$C are less than the rates at 15$\\sp\\circ$C and increase with salinity. Little Na is lost across the animals' surface at 5$\\sp\\circ$C; and Na permeability tends to be lower in dilute media than in more saline solutions. Na permeability is greatest at 15$\\sp\\circ$C in 100 mM NaCl; but the gradient for Na efflux is small and only ca. 20% of the efflux is via the epithelium. Urine volume has Q$\\sb{10}$s of about 2 over the 5-25$\\sp\\circ$C range. Renal Na loss increases with temperature in 1 and 100 mM NaCl, but is relatively constant in 10 mM. Rates of N excretion increase rapidly from 5 to 15$\\sp\\circ$C with Q$\\sb{10}$s of 3-4; and is less sensitive to temperatures from 15 to 25$\\sp\\circ$C with Q$\\sb{10}$s of 1-2. Ammonium is the chief nitrogenous waste when water turnover is rapid, accounting for ca. 60% of the excreted N. When water turnover is low, axolotls become ureotelic and accumulate urea. The roles of the gills, skin and kidneys in excreting NH$\\sb4$ and urea were examined. Branchial N excretion is 20-30% of the total, and generally slightly more urea than NH$\\sb4$ is excreted at the gills. The skin eliminates from 30-40% of the waste N and appears to be relatively impermeable to urea. The urinary contribution to the total efflux decreases from 30-40% at 5$\\sp\\circ$C, to a small percentage at 25$\\sp\\circ$C when the medium is dilute. Renal excretion of NH$\\sb4$ is always less than 10% of the N efflux.
546 $a English
590 $a School code: 0032
650 4 $a Anatomy & physiology. $3 3434423
650 4 $a Animals. $2 fast $3 518809
650 4 $a Biology. $3 522710
653 $a sodium balance
690 $a 0306
690 $a 0719
710 2 $a University of California, Riverside. $e degree granting institution. $3 3819579
720 1 $a Shoemaker, Vaughan H. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 52-12B.
790 $a 0032
791 $a Ph.D.
792 $a 1990
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9116685