Radiation response of energy-deficient yeast mutants: the relationship of radioresistance to respiratory and catalase activities as measured by oxygen polarography

1974 ◽  
Vol 20 (4) ◽  
pp. 587-593
Author(s):  
Alan K. Bruce ◽  
John H. Parker
Keyword(s):  
Respiratory System ◽  
Catalase Activity ◽  
Radiation Sensitivity ◽  
Radiation Response ◽  
Respiratory Capacity ◽  
Yeast Cultures ◽  
Yeast Mutants ◽  
Relationship Of ◽  
The Relationship

The radiation response of a group of respiration-deficient mutants of yeast was determined. Respiration and catalase activity was measured by a polarographic technique. Radiation response, as measured by D0, is correlated with both respiratory and catalase activities. Cultures grown in chloramphenicol were also examined. In these cultures, radiation response (D0) and respiration were both markedly decreased while catalase activity was generally increased. From these data we conclude that respiratory capacity may be involved in determining the radiation sensitivity of yeast cultures whereas catalase activity does not participate. Further, although the enzymes of the respiratory system and those generally associated with the peroxisome are similar chemically and functionally, they are controlled by different regulation systems.

The Relationship of Air Pollution and Economic Status to Total Mortality and Selected Respiratory System Mortality in Men

1968 ◽  
Vol 16 (3) ◽  
pp. 401-405 ◽  
Author(s):  
Warren Winkelstein ◽  
Seymour Kantor ◽  
Edward W. Davis ◽  
Charles S. Maneri ◽  
William E. Mosher
Keyword(s):  
Air Pollution ◽  
Respiratory System ◽  
Economic Status ◽  
Total Mortality ◽  
Relationship Of ◽  
The Relationship

THE RELATIONSHIP OF YELLOW COLOR ON MILK SEDIMENT PADS TO MASTITIS1

1966 ◽  
Vol 29 (2) ◽  
pp. 53-56 ◽  
Author(s):  
Sung S. Choi ◽  
T. L. Forster
Keyword(s):  
Catalase Activity ◽  
Esterase Activity ◽  
Leucocyte Count ◽  
The Other ◽  
Dairy Herds ◽  
Milk Samples ◽  
California Mastitis Test ◽  
Yellow Color ◽  
Relationship Of ◽  
The Relationship

Summary In a study of the relationship of yellow-colored material on milk sediment disks to mastitis, representative milk samples were examined from 400 individual quarters of 144 different cows in 7 dairy herds. Observations made included (a) California Mastitis Test (CMT) reaction, (b) yield of milk per quarter at one experimental milking, (c) leucocyte count, (d) catalase activity, (e) A-esterase activity, and (f) evaluation of a sediment disk for degree of yellow-colored material present. These observations revealed that the yellow-colored material was closely related to the other indices of mastitis. It was concluded that the yellow-colored material (a) is particulate in nature, (b) originates in the udder, and (c) the amount appearing on milk sediment disks is, in general, directly proportional to the severity of mastitis.

The Relationship of Air Pollution and Economic Status to Total Mortality and Selected Respiratory System Mortality in Men

1967 ◽  
Vol 14 (1) ◽  
pp. 162-171 ◽  
Author(s):  
Warren Winkelstein ◽  
Seymour Kantor ◽  
Edward W. Davis ◽  
Charles S. Maneri ◽  
William E. Mosher
Keyword(s):  
Air Pollution ◽  
Respiratory System ◽  
Economic Status ◽  
Total Mortality ◽  
Relationship Of ◽  
The Relationship

The Relationship of Blood Catalase Activity and Periodontal Disease

1955 ◽  
Vol 26 (3) ◽  
pp. 233-235
Author(s):  
Harold R. Englander ◽  
Irving L. Shklair ◽  
R. Quentin Blackwell ◽  
Leonard S. Fosdick
Keyword(s):  
Periodontal Disease ◽  
Catalase Activity ◽  
Relationship Of ◽  
The Relationship

On the relationship of indicators of pulmonary gas exchange in patients with rheumatic heart disease

1985 ◽  
Vol 66 (4) ◽  
pp. 298-299
Author(s):  
B. M. Andreev ◽  
E. F. Pichugina
Keyword(s):  
Heart Disease ◽  
Respiratory Failure ◽  
Gas Exchange ◽  
Rheumatic Heart Disease ◽  
Respiratory System ◽  
Heart Diseases ◽  
External Respiration ◽  
Relationship Of ◽  
The Relationship ◽  
Rheumatic Heart

Numerous studies have been devoted to the study of the function of external respiration in heart diseases, however, there are practically no works establishing the relationship between various links of the respiratory system and the dependence of external respiration on clinical forms of heart disease, which is important for elucidating the mechanisms of respiratory failure.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

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