The relationship between peroxidase activity in potato leaves and resistance toPhytophthora infestans

1959 ◽  
Vol 36 (4) ◽  
pp. 124-131 ◽  
Author(s):  
Vilhelm Umaerus
Keyword(s):  
Peroxidase Activity ◽  
The Relationship

scholarly journals Peroxidase activity in human cutaneous mast cells: an ultrastructural demonstration.

1984 ◽  
Vol 32 (6) ◽  
pp. 573-578 ◽  
Author(s):  
L M Escribano ◽  
L C Gabriel ◽  
T Sainz ◽  
A Rocamora ◽  
J M Arrazola ◽  
...  
Keyword(s):  
Mast Cell ◽  
Enzyme Activity ◽  
Mast Cells ◽  
Peroxidase Activity ◽  
Ultrastructural Level ◽  
Prostaglandin Synthesis ◽  
Cell Disease ◽  
Mast Cell Disease ◽  
Cytochemical Technique ◽  
The Relationship

An intense and reproducible peroxidase staining in the cutaneous mast cells of two patients with systemic mast cell disease and urticaria pigmentosa is demonstrated at the ultrastructural level. This enzyme activity was demonstrated by use of a cytochemical technique employing 3,3'- diaminobenzicine (DAB) as an oxidizable substrate, after fixation by a tannic acid-aldehyde mixture. Enzyme activity was localized in the perinuclear cisterna and strands of endoplasmic reticulum. Granules appeared unreactive. This peroxidase activity appears sensitive to fixation by aldehydes; it is inhibited by 3-amino-1,2,4-triazole (AMT) and by lack of H2O2 or DAB in the incubation medium. These characteristics are fundamentally different from the peroxidase activity of basophils, and the demonstration of this enzyme is therefore not a further argument for a common ontogenetic origin of both cells. On the other hand, the cytochemical characteristics of this enzyme are very similar to those of platelet peroxidase (P-PO), which has been connected to the synthesis by platelets of prostaglandins. Since the mast cell is known to generate prostaglandins, the relationship between the enzyme described and prostaglandin synthesis by mast cells is discussed.

scholarly journals Studies on Wheat Peroxidase

1969 ◽  
Vol 22 (1) ◽  
pp. 261 ◽  
Author(s):  
RW Parish
Keyword(s):  
Peroxidase Activity ◽  
Tobacco Leaf ◽  
The Relationship ◽  
Leaf Disks

Recently, workers in this laboratory have studied the increased synthesis of peroxidase in senescing tobacco leaf disks (Parish 1968a, 1968b) and the relationship between lignification and peroxidase activity in wheat internodes (Parish and Miller 1968). The present paper reports four simple experiments designed to further clarify the interrelationships between lignification, maturation, and peroxidase activity.

scholarly journals Morphogenesis in vitro and peroxidase activity in barley cv. Steptoe and its ABA-deficient mutant AZ34: effects of inhibitors of ABA synthesis and auxin transport

2020 ◽  
Author(s):  
O. A. Seldimirova ◽  
G. R. Kudoyarova ◽  
I. R. Galin ◽  
D. S. Veselov ◽  
N. N. Kruglova
Keyword(s):  
Peroxidase Activity ◽  
Auxin Transport ◽  
Deficient Mutant ◽  
Barley Mutant ◽  
Morphogenesis In Vitro ◽  
The Relationship ◽  
Aba Synthesis

The relationship between the effect of ABA on morphogenesis in vitro and auxin transport, as well as the role of peroxidases in the action of ABA on morphogenesis in vitro in the ABA-deficient barley mutant AZ34 and its parent form cv. Steptoe was studied.

Glutathione peroxidase and selenium in sheep. II.* The relationship between glutathione peroxidase and selenium-responsive unthriftiness in Merino lambs

1979 ◽  
Vol 30 (4) ◽  
pp. 703 ◽  
Author(s):  
DI Paynter ◽  
JW Anderson ◽  
JW McDonald
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Glutathione Peroxidase ◽  
Peroxidase Activity ◽  
Body Weight Gain ◽  
Selenium Status ◽  
Glutathione Peroxidase Activity ◽  
Central Victoria ◽  
Selenium Treatment ◽  
The Relationship

Low erythrocyte activities of the selenium-containing enzyme glutathione peroxidase were found in Merino lambs in an area of the Strathbogie Ranges in central Victoria where selenium-responsive conditions have previously been reported. Body weight gain trials conducted over 10 properties in the above area demonstrated that the severity of selenium-responsive unthriftiness was significantly correlated with the erythrocyte glutathione peroxidase activity (r = – 0.95, P <: 0.001). Positive body weight responses to selenium treatment were only observed in lambs with erythrocyte glutathione peroxidase activities less than 30 U/g Hb prior to selenium treatment. These findings indicate that measurement of erythrocyte glutathione peroxidase activity provides a convenient index of the selenium status in sheep. ________________ *Part I, Aust. J. Agric. Res., 30: 695 (1979).

Why no simple relationship between thyroid peroxidase activity-inhibiting immunoglobulins and thyroid function in autoimmune thyroid disease?

1991 ◽  
Vol 124 (4) ◽  
pp. 442-448 ◽  
Author(s):  
Yasuyuki Okamoto ◽  
Noboru Hamada ◽  
Toshimichi Fujisawa ◽  
Jaeduk Noh ◽  
Junichi Yamakawa ◽  
...  
Keyword(s):  
Thyroid Function ◽  
Peroxidase Activity ◽  
Immunoglobulin G ◽  
Enzyme Histochemistry ◽  
Follicular Epithelium ◽  
Thyroid Peroxidase ◽  
Simple Relationship ◽  
Autoimmune Thyroid ◽  
The Relationship

Abstract. We have reported that some anti-thyroid peroxidase antibodies inhibit the activity of thyroid peroxidase in vitro. These thyroid peroxidase activity-inhibiting immunoglobulins seem to inhibit thyroid function in some patients, but the relationship between thyroid peroxidase activity-inhibiting immunoglobulins and thyroid function is not simple. We designed this study to explore this lack of a simple relationship. We stained immunoglobulin G deposits by immunofluorescence staining or the peroxidase-antiperoxidase method, and stained endogenous thyroid peroxidase activity by enzyme histochemistry in thyroid sections. When cryostat thyroid sections were incubated with thyroid peroxidase activity-inhibiting immunoglobulins, immunoglobulin G deposits were seen as lines of stain on the apical border and as intracellular staining, and endogenous thyroid peroxidase activity was inhibited. In paraffin-embedded thyroid sections from 5 Hashimoto's patients and 6 Graves' patients, immunoglobulin G deposits were not found on the apical border of the follicular epithelium. In frozen thyroid sections from 22 Graves' patients, no clear deposits of immunoglobulin G on this apical border were seen. In organ-cultured thyroid slices incubated with thyroid peroxidase activity-inhibiting immunoglobulins, endogenous thyroid peroxidase activity was not inhibited. In conclusion, thyroid peroxidase activity-inhibiting immunoglobulins may reach its antigen only with difficulty. This is one of the reasons why no simple relationship is observed between thyroid peroxidase activity-inhibiting immunoglobulins and thyroid function.

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