A rapid method for monitoring low levels of di-(2-ethylhexyl) phthalate in solutions

The Analyst ◽  
1975 ◽  
Vol 100 (1197) ◽  
pp. 857 ◽  
Author(s):  
E. Weisenberg ◽  
Y. Schoenberg ◽  
N. Ayalon
Keyword(s):  
Rapid Method ◽  
Low Levels ◽  
Ethylhexyl Phthalate

Comparison of Broth and Filtration Methods for Culturing of Intravenous Fluids

1982 ◽  
Vol 3 (5) ◽  
pp. 397-400 ◽  
Author(s):  
Jenice N. Longfield ◽  
Patricia Charache ◽  
Earl L. Diamond ◽  
Timothy R. Townsend
Keyword(s):  
Rapid Method ◽  
Microbial Contamination ◽  
Membrane Filter ◽  
Intravenous Fluid ◽  
Intravenous Fluids ◽  
Filtration Method ◽  
E Coli ◽  
Membrane Filters ◽  
Valuable Adjunct ◽  
Low Levels

AbstractNinety-six specimens of intravenous fluid solutions (D5/025 NS) were inoculated with S. aureus, E. coli, P. aeruginosa, K. pneumoniae, E. agglomerans, or C. albicans in concentrations of .1, 1, 10, or 102 organisms/ml. They were cultured in tubes containing 5 ml of double enriched broth and after passage through a .45 μ pore membrane filter. After 24 hours of incubation, broth cultures were 68% as sensitive as the filter cultures (p<.001). At the lowest concentration (.1 organism/ml) broth cultures were only 45% as sensitive as the membrane filter technique after 24 hours of growth (p<.001). Membrane filters provide a rapid method to accurately detect and quantitate the presence of microbial contamination even at very low levels of concentration. The simplicity and accuracy of the filtration method offers the clinician a valuable adjunct in managing suspected cases of intravenous fluid related sepsis.

scholarly journals Assessment of the Arterial Input Curve for [99mTc]-d,l-HM-PAO by Rapid Octanol Extraction

1988 ◽  
Vol 8 (1_suppl) ◽  
pp. S23-S30 ◽  
Author(s):  
Allan R. Andersen ◽  
Hans Friberg ◽  
Niels A. Lassen ◽  
K. Kristensen ◽  
Rudi D. Neirinckx
Keyword(s):  
Rapid Method ◽  
Half Life ◽  
Quantitative Measurements ◽  
Arterial Blood ◽  
Conversion Rates ◽  
Low Levels ◽  
Blood Cell And Plasma ◽  
The One

The in vitro conversion of the lipophilic molecule [99mTc]– d,l-hexamethylpropyleneamine oxime ([99mTc]– d,l-HM-PAO) to a hydrophilic form was studied in saline, plasma, and blood at 37°C by paper chromatography and by octanol extraction. The octanol:saline ratio was 79.9. From this value and the corresponding octanol: plasma and octanol:blood partitioning values, an estimate of the transport of the lipophilic compound by various components of blood was made: 20% is carried in hemoglobin, 53% by the plasma proteins and 27% by the water phases of the red blood cell and plasma. Octanol extraction provided a rapid method for measuring the radiochemical purity (RCP) of lipophilic [99mTc]– d,l-HM-PAO. In saline, the RCP declined with a half-life of more than 1 h. In human plasma and whole blood, the conversion of [99mTc]– d,l-HM-PAO was biexponential due to the differences in the conversion rates of the d and l isomeric forms. The initial half-life representing the conversion rate of the l form was 1.7 min in blood and 1.4 min in plasma, while the conversion half-life of the d form was 7.4 and 24.4 min, respectively. In vivo, the RCP of arterial blood sampled after an i.v. bolus injection showed an initial peak value of 75% (68–79%) during the initial, first passage of the bolus. It declined to approximately 35% (29–40%) after 1.5 min and reached very low levels (about 1%) at 6 to 10 min. Quantitative measurements of cerebral blood flow using [99mTc]– d,l-HM-PAO necessitates a rapid method for RCP determination in arterial blood such as the one described here.

Texture measurements in Al2O3 using BEKP

1994 ◽  
Vol 52 ◽  
pp. 608-609
Author(s):  
M. D. Vaudin ◽  
J. P. Cline
Keyword(s):  
Neutron Diffraction ◽  
Rapid Method ◽  
Crystallographic Orientation ◽  
Specimen Surface ◽  
X Ray Diffraction ◽  
Anisotropic Crystal ◽  
X Ray ◽  
Verification Method ◽  
Crystal Properties ◽  
Backscattered Electron

The study of preferred crystallographic orientation (texture) in ceramics is assuming greater importance as their anisotropic crystal properties are being used to advantage in an increasing number of applications. The quantification of texture by a reliable and rapid method is required. Analysis of backscattered electron Kikuchi patterns (BEKPs) can be used to provide the crystallographic orientation of as many grains as time and resources allow. The technique is relatively slow, particularly for noncubic materials, but the data are more accurate than any comparable technique when a sufficient number of grains are analyzed. Thus, BEKP is well-suited as a verification method for data obtained in faster ways, such as x-ray or neutron diffraction. We have compared texture data obtained using BEKP, x-ray diffraction and neutron diffraction. Alumina specimens displaying differing levels of axisymmetric (0001) texture normal to the specimen surface were investigated.BEKP patterns were obtained from about a hundred grains selected at random in each specimen.

Many Migraineurs Have Low Levels of Vitamin D

2008 ◽  
Vol 41 (18) ◽  
pp. 16
Author(s):  
DIANA MAHONEY
Keyword(s):  
Vitamin D ◽  
Low Levels

Social Motives Predict Loneliness During a Developmental Transition

2017 ◽  
Vol 76 (4) ◽  
pp. 145-153 ◽  
Author(s):  
Jana Nikitin ◽  
Alexandra M. Freund
Keyword(s):  
Social Relationships ◽  
Well Being ◽  
Social Avoidance ◽  
Social Approach ◽  
Social Motives ◽  
Developmental Transitions ◽  
Avoidance Motivation ◽  
Negative Effect ◽  
Low Levels

Abstract. Establishing new social relationships is important for mastering developmental transitions in young adulthood. In a 2-year longitudinal study with four measurement occasions (T1: n = 245, T2: n = 96, T3: n = 103, T4: n = 85), we investigated the role of social motives in college students’ mastery of the transition of moving out of the parental home, using loneliness as an indicator of poor adjustment to the transition. Students with strong social approach motivation reported stable and low levels of loneliness. In contrast, students with strong social avoidance motivation reported high levels of loneliness. However, this effect dissipated relatively quickly as most of the young adults adapted to the transition over a period of several weeks. The present study also provides evidence for an interaction between social approach and social avoidance motives: Social approach motives buffered the negative effect on social well-being of social avoidance motives. These results illustrate the importance of social approach and social avoidance motives and their interplay during developmental transitions.

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