4. A Controlled Study of the Extent and Types of Mold Growth Occurring on Treated and Untreated Wet Gypsum Wallboard in a Normal Office Environment

2004 ◽  
Author(s):  
C. Robbins ◽  
S. Swenson ◽  
M. Krause ◽  
W. Geer ◽  
P. Fallah
Keyword(s):  
Controlled Study ◽  
Mold Growth ◽  
Office Environment

Controlled Study of Mold Growth and Cleaning Procedure on Treated and Untreated Wet Gypsum Wallboard in an Indoor Environment

2006 ◽  
Vol 3 (8) ◽  
pp. 435-441 ◽  
Author(s):  
Michael Krause ◽  
William Geer ◽  
Lonie Swenson ◽  
Payam Fallah ◽  
Coreen Robbins
Keyword(s):  
Indoor Environment ◽  
Controlled Study ◽  
Mold Growth ◽  
Cleaning Procedure

Application of a Simple Cold Stub to the Direct Observation of Frozen Hydrated Sand

1973 ◽  
Vol 31 ◽  
pp. 212-213
Author(s):  
John M. Wehrung ◽  
Richard J. Harniman
Keyword(s):  
United States ◽  
Surface Water ◽  
Direct Observation ◽  
Controlled Study ◽  
Clay Particles ◽  
Organic Debris ◽  
Rock Formations ◽  
Water Tables ◽  
Permeable Rock ◽  
Natural Means

Water tables in aquifer regions of the southwest United States are dropping off at a rate which is greater than can be replaced by natural means. It is estimated that by 1985 wells will run dry in this region unless adequate artificial recharging can be accomplished. Recharging with surface water is limited by the plugging of permeable rock formations underground by clay particles and organic debris.A controlled study was initiated in which sand grains were used as the rock formation and water with known clay concentrations as the recharge media. The plugging mechanism was investigated by direct observation in the SEM of frozen hydrated sand samples from selected depths.

Studies on Ultrastructure and Cytochemistry of Right Ventricular Endomyocardial Biopsy

1990 ◽  
Vol 48 (3) ◽  
pp. 256-257
Author(s):  
Xia Mingyu ◽  
Ma Wengshu ◽  
Wu Xiangh ◽  
Chen Dong
Keyword(s):  
Light Microscopy ◽  
Right Ventricular ◽  
Dilated Cardiomyopathy ◽  
Endomyocardial Biopsy ◽  
Heart Diseases ◽  
Ultrastructural Localization ◽  
Controlled Study ◽  
Myocardial Biopsy ◽  
Morphological Assessment ◽  
Rheumatic Heart

This paper describes morphological and cytochemistry changes of endomyocardial biopsy in 94 patients. The samples of myoicardium were taken from 32 patients with dilated cardiomyopathy, and sdudied with light and electron microscop. The cytochemical studies in some of these patients were performed at histological and ultrastructure level. This paper also reported the result of myocardial biopsy in 33 patients with serious dysrythmia.The result of this controlled study indicates that morphological assessment in both cardiomyopathy and congenital or rheumatic heart diseases showed no special changes. In patients of dilated cardiomyopathy, the decreased activity of myosin ATPase was secondary to cardial failure. The change of succinate dehydrogenase (SDHase) was not significant with light microscopy. But ultrastructural localization of SDHase activity is valuable. Its activity was found to be localized in endomembrane and ridge of the mitochondria, the activity of this enzyme was decrease, normal, or increase. SDHase activity was more intense in cardial myocytes well-functioning, or ultrastructurally well preserved hearts.

Morphometric analysis of peroxisomes in hepatocytes of alcohol-fed rats

1989 ◽  
Vol 47 ◽  
pp. 1100-1101
Author(s):  
D.C. Dominguez ◽  
J.T. Ellzey
Keyword(s):  
Caloric Intake ◽  
Volume Density ◽  
Controlled Study ◽  
Control Group ◽  
Numerical Density ◽  
Cacodylate Buffer ◽  
Paired Control ◽  
Experimental Group ◽  
Liver Peroxisomes ◽  
Single Lesion

Peroxisomes which participate in 1ipid metabolism have been shown to be altered in several metabolic disorders and toxic conditions. In alcoholic liver disease, the single lesion most frequently found is lipid accumu1ation in hepatocytes. However, the mechanisms for this 1ipid accumu1ation are not clear. The occurrence of modifications of liver peroxisomes due to excess alcohol consumption has not been subjected to a controlled study. We utilized a combination of cytochemica1 and morphometrictechniques to study the size and number of liver peroxisomes in rats fed an alcohol-supplemented diet compared to those of matched-paired control animals.Male Sprague-Daw1ey rats (400-500 g) received a liquid diet. The experimental group (N = 5/group) was fed a diet containing 30% ethanol-derived calories (EDC) and the control group was fed an isocaloric diet to 30% EDC. A pair feeding procedure was employed to control for caloric intake. Small pieces of liver randomly selected, were fixed in 2.3% -glutaraldehyde in 0.1 M sodium cacodylate buffer, pH 7.2, incubated in a DAB medium and postfixed with. 2% aqueous osmium tetroxide. EM photographs were taken from sections of 3 tissue blocks from each sample (7,200X) with a Zeiss EM10-A (60 kV). With the use of a point counting method and a digital planimeter the volume density (Vv) and numerical density (Nv) were determined.

Myringotomy in acute otitis media. A controlled study

JAMA ◽  
1966 ◽  
Vol 197 (11) ◽  
pp. 849-853 ◽  
Author(s):  
O. F. Roddey
Keyword(s):  
Otitis Media ◽  
Acute Otitis Media ◽  
Controlled Study
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