scholarly journals The effect of usnic acid supplementation on rabbit’s tissues surrounding implant apoptosis and some enzyme activities

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Fehmi Odabasoglu ◽  
Omer S. Yildirim ◽  
Zekai Halici ◽  
Hayati Aygun ◽  
Mesut Halici ◽  
...  
Keyword(s):  
Enzyme Activities ◽  
Usnic Acid ◽  
Acid Supplementation

High time resolution enzyme cytochemistry of rod outer segment

1990 ◽  
Vol 48 (3) ◽  
pp. 878-879
Author(s):  
Takuma Saito ◽  
Toshihiro Takizawa
Keyword(s):  
Enzyme Activities ◽  
Outer Segment ◽  
Rapid Change ◽  
High Time Resolution ◽  
Visual Cell ◽  
Enzyme Cytochemistry ◽  
Activation Effect ◽  
Rod Outer Segment ◽  
Enzymatic Cascades ◽  
Rapid Drop

Cells and tissues live on a number of dynamic metabolic pathways, which are made up of sequential enzymatic cascades.Recent biochemical and physiological studies of vision research showed the importance of cGMP metabolism in the rod outer segment of visual cell, indicat ing that the photon activated rhodopsin exerts activation effect on the GTP binding protein, transducin, and this act ivated transducin further activates phosphodiesterase (PDEase) to result in a rapid drop in cGMP concentration in the cytoplasm of rod outer segment. This rapid drop of cGMP concentration exerts to close the ion channel on the plasma membrane and to stop of inward current brings hyperpolarization and evokes an action potential.These sequential change of enzyme activities, known as cGMP cascade, proceeds quite rapidly within msec order. Such a rapid change of enzyme activities, such as PDEase in rod outer segment, was not a matter of conventional histochemical invest igations.

Tryptophan-Niacin Metabolism in Rat with Puromycin Aminonucleoside-Induced Nephrosis

2006 ◽  
Vol 76 (1) ◽  
pp. 28-33 ◽  
Author(s):  
Yukari Egashira ◽  
Shin Nagaki ◽  
Hiroo Sanada
Keyword(s):  
Body Weight ◽  
Urinary Excretion ◽  
Enzyme Activities ◽  
Treated Group ◽  
Control Group ◽  
Puromycin Aminonucleoside ◽  
Low Level ◽  
Key Enzyme

We investigated the change of tryptophan-niacin metabolism in rats with puromycin aminonucleoside PAN-induced nephrosis, the mechanisms responsible for their change of urinary excretion of nicotinamide and its metabolites, and the role of the kidney in tryptophan-niacin conversion. PAN-treated rats were intraperitoneally injected once with a 1.0% (w/v) solution of PAN at a dose of 100 mg/kg body weight. The collection of 24-hour urine was conducted 8 days after PAN injection. Daily urinary excretion of nicotinamide and its metabolites, liver and blood NAD, and key enzyme activities of tryptophan-niacin metabolism were determined. In PAN-treated rats, the sum of urinary excretion of nicotinamide and its metabolites was significantly lower compared with controls. The kidneyα-amino-β-carboxymuconate-ε-semialdehyde decarboxylase (ACMSD) activity in the PAN-treated group was significantly decreased by 50%, compared with the control group. Although kidney ACMSD activity was reduced, the conversion of tryptophan to niacin tended to be lower in the PAN-treated rats. A decrease in urinary excretion of niacin and the conversion of tryptophan to niacin in nephrotic rats may contribute to a low level of blood tryptophan. The role of kidney ACMSD activity may be minimal concerning tryptophan-niacin conversion under this experimental condition.

Effect of a constant supply of different nitrogen sources on protein and carbohydrate content and enzyme activities of Anabaena variabilis cells

1995 ◽  
Vol 95 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Andres P Sanz ◽  
Conrado Moreno-Vivian ◽  
Jose M. Maldonado ◽  
Agustin Gonzalez-Fontes
Keyword(s):  
Enzyme Activities ◽  
Nitrogen Sources ◽  
Carbohydrate Content ◽  
Anabaena Variabilis

An usnic acid derivative as new tweezer for non-covalent aromatic interaction complex

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
B Legouin ◽  
M Chollet-Krugler ◽  
S Tomasi ◽  
P Uriac ◽  
P van de Weghe
Keyword(s):  
Acid Derivative ◽  
Usnic Acid ◽  
Aromatic Interaction

d/l threo-methylphenidate enantiomers influence on catecholaminergic enzyme activities

2011 ◽  
Vol 44 (06) ◽  
Author(s):  
E Grünblatt ◽  
J Bartl ◽  
S Hofmann ◽  
A Borst ◽  
P Riederer ◽  
...  
Keyword(s):  
Enzyme Activities ◽  
Methylphenidate Enantiomers
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