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1999 (2)
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1Author    G. TripathiRequires cookie*
 Title    Thyroid Hormone-Induced Changes in Cytoplasmic and Mitochondrial Proteins of a Teleost  
 Abstract    The effect of triiodothyronine (T 3) on the cytoplasmic and mitochondrial protein contents were studied in the liver and skeletal muscle of a freshwater teleost. The fish exposed to thiouracil for 28 days showed 1 .5 -2 times reduction in the total protein contents of cyto­ plasmic and mitochondrial fractions. A single injection of T 3 to thiouracil exposed fish caused 
  Reference    Z. Naturforsch. 53c, 120 (1998); received June 2/Novem ber 18 1997 
  Published    1998 
  Keywords    Triiodothyronine, Protein, Liver, Skeletal Muscle, Fish 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0120.pdf 
 Identifier    ZNC-1998-53c-0120 
 Volume    53 
2Author    G. TripathiRequires cookie*
 Title    Kinetics of Thyroid Hormone Induced Changes in Liver and Skeletal Muscle Enzymes of Clarias batrachus  
 Abstract    Kinetics of triiodothyronine (T 3) induced changes were studied in cytoplasmic malate dehydrogenase (cM DH), mitochondrial malate dehydrogenase (mMDH) and lactate dehydrogenase (LD H) of the liver and skeletal muscle of a catfish, Clarias batrachus. The rates of gradual inductions in the activities of all the three metabolic enzymes were faster in skeletal muscle than those of the liver. These time-dependent and tissue-specific inductions may be due to the possible differ­ ences in the rates of different enzymic syntheses. The maximum inductions in the activities of cMDH, mMDH and LD H were recorded around 19 hr after T 3 treat­ ment. Thereafter, the activities of all the enzymes grad­ ually declined to their half levels within the next 12 hr which reflected the physiological half-life of these meta­ bolic enzymes in the freshwater catfish. 
  Reference    Z. Naturforsch. 54c, 458 (1999); received December 28 1998/March 1 1999 
  Published    1999 
  Keywords    Triiodothyronine, MDH, LDH, Liver, Skeletal Muscle 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0458_n.pdf 
 Identifier    ZNC-1999-54c-0458_n 
 Volume    54 
3Author    Ghanashyam TripathiRequires cookie*
 Title    Scaling of Some Metabolic Enzymes in Liver of a Freshwater Teleost: An Adaptive Mechanism  
 Abstract    The activities of mitochondrial malate dehydrogenase (m M DH) and the total mito­ chondrial proteins increase as a function of body mass in the freshwater catfish, Clarias batrachus. It clearly indicates an increase in energy production in larger-sized individuals for various purposes including prey-predator interactions. The higher activity of lactate dehydro­ genase (LDH) in larger fish may indicate more production of lactate for gluconeogenesis in the liver to meet emergency requirements of increased energy demand. However, the activity of cytoplasmic malate dehydrogenase (cMDH) decreases with the increasing body mass of the fish which reflects reduction in N ADPH production and, in turn, reduced lipogenesis in liver of larger individuals. Thus, the present observations suggest an adaptive mechanism dealing with the higher energy budget, and reduced synthetic activities (lipogenesis) in the liver of larger-sized freshwater catfish. This type of biochemical scaling might be also support­ ing other metabolic pathways in order to adjust some physiological functions for survival in the aquatic environment. 
  Reference    Z. Naturforsch. 54c, 1103—1106 (1999); received July 12/September 1 1999 
  Published    1999 
  Keywords    Teleost, Liver, Scaling, Lactate Dehydrogenase, Malate Dehydrogenase 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-1103.pdf 
 Identifier    ZNC-1999-54c-1103 
 Volume    54 
4Author    Rolf Schulte-Hermann, Hanna LandgrafRequires cookie*
 Title    Circadiane Rhythm of Cell Proliferation in Rat Liver: Synchronization by Feeding Habits  
 Abstract    A diurnal rhythm of cell proliferation exists in the liver of young rodents and in the growing liver of rats treated with a-hexachlorocyclohexane (a-HCH). The timing of the rhythm is dependent on the time of feeding but independent from the lighting regimen. This suggests that under natural circumstances the light-dark rhythm synchronizes the rhythm of hepatocyte proliferation by con­ trolling the animals' feeding habits. 
  Reference    (Z. Naturforsch. 29c, 421 [1974]; received March 25 1974) 
  Published    1974 
  Keywords    Liver, Cell Proliferation, Circadiane Rhythm, Controlled Feeding Schedule, Xenobiotic Compounds 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0421.pdf 
 Identifier    ZNC-1974-29c-0421 
 Volume    29