reverse redistribution pattern is defined as decreased activity in the myocardium in the rest phase of the myocardial perfusion scan in comparison with the stress images. there are many studies concerning the etiology and clinical significant of this phenomenon in nuclear medicine literature. the dominant idea about etiology of reverse redistribution is early wash out of the radiotracer from th...

statement of the problem periodontitis is a common infectious disease that can be affected by different factors.periodontal conditions can be influenced by systemic diseases and they also can act as risk factors for some systemic diseases. several studies have been carried out on the relationship between cardiovascular disease and periodontal disease. purpose the purpose of our study was to eva...

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A radioisotopic assay for adenosine deaminase (EC 3.5.4.4) is described together with its application in investigating the activity of the enzyme in rat cerebral cortex. Activity of the adenosine deaminase was determined to be 115nmol/min per g of tissue, measured in isoosmotic sucrose dispersions of the neocortex, and to be 170nmol/min per g of tissue after treatment with Triton X-100. The enz...

We have shown that the combination of freeze-fracture with electron microscope autoradiography can be developed into a technique for correlating the molecular structure of the biological membrane with its chemical and functional characteristics. Within the limits of electron microscope autoradiographic resolution, FARG has the potential to detect the relative distribution of molecules in each h...

l. Radioisotopic studies with 22Na were conducted in vitro on nerve cords of the grasshopper Melanoplus differentialis. 2. The total uptake of 22Na by nerve cords is significantly decreased by the presence of 5 mM azide in the incubation medium. 3. Six components were extracted from desaturation curves of nerve cords, after which some residual radioactivity remained in the majority of cases. 4....

Sucrose and glucose catabolism by seven strains of Streptococcus mutans belonging to six serotypes was assayed at pH's 6.5, 5.0, 4.5, and 4.0 with a radioisotopic tracer assay. The strains differed in their patterns of metabolic stimulation and inhibition at the different pH levels, falling into groups corresponding to the genetic groups described by Coykendall. The genogroup I (serotypes c and...

Investigations of splenic size have been hampered in part by a lack of suitable methodologies. During the past several years, radiographic and radioisotopic procedures have begun to provide techniques for studying the size of the spleen in vivo. When data gathered by these procedures are combined with the results of in vitro studies, an improved (albeit still incomplete) picture of splenic grow...