Quantitative Measurement of Parkinsonian Tremor Before and After Stereotactic Operation

1979 ◽  
pp. 197-202 ◽  
Author(s):  
F. Brandt ◽  
F. Oppel
Keyword(s):  
Quantitative Measurement ◽  
Parkinsonian Tremor ◽  
Stereotactic Operation ◽  
Before And After

Comparison of Unilateral and Bilateral ECT: Evidence for Selective Memory Impairment

1982 ◽  
Vol 141 (6) ◽  
pp. 608-613 ◽  
Author(s):  
Delee Fromm-Auch
Keyword(s):  
Verbal Memory ◽  
Affective Disorders ◽  
Memory Impairment ◽  
Quantitative Measurement ◽  
Memory Functions ◽  
Relative Lack ◽  
The Past ◽  
Treatment Of Depression ◽  
Before And After ◽  
Verbal Functions

SummaryReview of studies from the past 16 years employing quantitative measurement of memory functions before and after ECT revealed the following trends: impairment of non-verbal memory functions after less than five unilateral non-dominant ECTs; improvement of non-verbal memory functions after five or more unilateral non-dominant ECTs; no change or improvement of verbal memory functions with unilateral non-dominant ECT; consistent impairment of verbal functions with unilateral dominant ECT, and impairment of both verbal and nonverbal functions with bilateral ECT. The relative lack of impairment in memory functions with unilateral non-dominant ECT is consistent with the theory of asymmetrical hemispheric disorganization in affective disorders, and supports the choice of unilateral non-dominant ECT over bilateral or unilateral dominant ECT in the treatment of depression.

Objective Evaluation Method for Chlorine Detector Tubes

2016 ◽  
Vol 66 (2) ◽  
pp. 107
Author(s):  
Tomas Rozsypal ◽  
Zbynek Kobliha
Keyword(s):  
Response Time ◽  
Quantitative Measurement ◽  
Evaluation Method ◽  
Limit Of Detection ◽  
Objective Evaluation ◽  
Time Limit ◽  
Before And After ◽  
Detection Response ◽  
Quantitative Detector

<p>A tristimulus colourimetric method for the evaluation of detection response of chlorine detector tubes has been developed. The method is based on the suction of chlorine through the respective tube, followed by objective evaluation of the colouration change by means of a reflectance spectrophotometer. This eliminates errors in evaluation and allows identification of further positive attributes of detector tubes (e.g. response time, limit of detection). The method is suitable for tubes produced by various manufacturers. Oritest, Dräger and Gastec tubes were selected and measured. The response time of tubes lasted up to 30 s. The limit of detection was lowered up to four times. Reflectance curves of tubes before and after colouration change were recorded. The method also created the possibility of quantitative measurement by non-quantitative detector tubes.</p>

scholarly journals Detection and elimination of signal errors due to unintentional movements in biomedical magnetic induction tomography spectroscopy (MITS)

2018 ◽  
Vol 9 (1) ◽  
pp. 163-175 ◽  
Author(s):  
S. Issa ◽  
H. Scharfetter
Keyword(s):  
Image Reconstruction ◽  
Quantitative Measurement ◽  
The Novel ◽  
Dispersion Frequency ◽  
Single Turn ◽  
Before And After ◽  
Magnetic Induction Tomography ◽  
The One ◽  
Reference Measurements ◽  
Soft Ferrite

Abstract In biomedical MITS, slight unintentional movements of the patient during measurement can contaminate the aimed images to a great extent. This study deals with measurement optimization in biomedical MITS through the detection of these unpredictable movements during measurement and the elimination of the resulting movement artefacts in the images to be reconstructed after measurement. The proposed detection and elimination (D&E) methodology requires marking the surface of the object under investigation with specific electromagnetically perturbing markers during multi-frame measurements. In addition to the active marker concept already published, a new much simpler passive marker concept is presented. Besides the biological signal caused by the object, the markers will perturb the primary magnetic field inducing their own signals. The markers' signals will be used for the detection of any unwanted object movements and the signal frames corrupted thereby. The corrupted signal frames will be then excluded from image reconstruction in order to prevent any movement artefacts from being imaged with the object. In order to assess the feasibility of the developed D&E technique, different experiments followed by image reconstruction and quantitative analysis were performed. Hereof, target movements were provoked during multifrequency, multiframe measurements in the β-dispersion frequency range on a saline phantom of physiological conductivity. The phantom was marked during measurement with either a small single-turn coil, an active marker, or a small soft-ferrite plate, a passive marker. After measurement, the erroneous phantom signals were corrected according to the suggested D&E strategy, and images of the phantom before and after correction were reconstructed. The corrected signals and images were then compared to the erroneous ones on the one hand, and to other true ones gained from reference measurements wherein no target movements were provoked on the other hand. The obtained qualitative and quantitative measurement and image reconstruction results showed that the erroneous phantom signals could be accurately corrected, and the movement artefacts could be totally eliminated, verifying the applicability of the novel D&E technique in measurement optimization in biomedical MITS and supporting the proposed aspects.

Cartilage Curvature Reshaping: A Quantitative Assessment

2021 ◽  
Author(s):  
Kamran As’adi ◽  
Seyed Jafar Hashemian ◽  
Seyed Hamid Salehi ◽  
Seyed Jaber Mousavi
Keyword(s):  
Quantitative Methods ◽  
Quantitative Measurement ◽  
Radius Of Curvature ◽  
Mattress Suture ◽  
First Order ◽  
New Zealand White Rabbits ◽  
Before And After ◽  
Ear Cartilage ◽  
Cartilage Reshaping ◽  
Horizontal Mattress Suture

Abstract Background Horizontal mattress suture is frequently performed procedure during Rhinoplasty and Otoplasty to control the curvature of the cartilages. Despite the popularity of mattress technique, there are no quantitative methods to determine the suture effects in cartilage reshaping. Objectives The aim of the present experimental study was to quantify the straightening effect of mattress suture on convexity of ear cartilage in rabbit models. Methods Eleven young adult male New Zealand white rabbits were used in this study. Horizontal mattress suture with spacing 3×6 mm was used in rectangle demarcated on left ear in area with maximum convexity. Preoperative and postoperative photographers were done before and immediately after surgery respectively. The Radius of curvature (ROC), first order deviation (FOD) and second order deviation (SOD) were calculated to quantify net cartilage reshaping, each point changes and homogeneity of new shaped cartilage respectively. Results The means for ROC were 1.112 and 2.169 before and after surgery respectively. ROC as indicator of net overall changing increased statistically significant. The means of FOD as each point slope index was statistically lower after surgery. (0.269 before surgery, 0.135 after surgery) The means for SOD also significantly decreased after surgery. (0.007 before surgery, 0.003 after surgery) The values of SOD remained positive after surgery that indicate changes in curve were homogenous. Conclusions A quantitative measurement method was introduced to directly quantify the controlling effect of suture. This quantifying method seems to be mandatory to compare the effect of horizontal mattress suture with other techniques in cartilage reshaping.

scholarly journals Determination By Liquid Chromatography With Electrochemical Detection Of Cysteamine And Cysteine, Possible Precursors Of /V-Nitrosothiazolidine

1987 ◽  
Vol 70 (6) ◽  
pp. 1033-1035
Author(s):  
John W Pensabene ◽  
Robert C Doerr ◽  
Walter Fiddler
Keyword(s):  
Liquid Chromatography ◽  
Electrochemical Detection ◽  
Quantitative Measurement ◽  
Mercury Electrode ◽  
Meat Products ◽  
Meat Sample ◽  
Ground Meat ◽  
Before And After ◽  
Sulfhydryl Compounds ◽  
Food Substrate

Abstract A method is described that is selective, sensitive, rapid, and accurate for the quantitative measurement in meat products of both cysteamine and cysteine, potential precursors for TV-nitrosothiazolidine (NTHZ) and Ar-nirrosothiazolidine-4-carboxylic acid (NTHZC), respectively. In general, a ground meat sample is homogenized with acetonitrileformate buffer in the presence of dithiothreitol, and then is centrifuged, filtered, and recentrifuged in a disposable microfilter. The thiols are quantitated by liquid chromatography using an amperometric detector equipped with a gold/mercury electrode operated in the oxidative mode. Cysteamine was found in 6 of 20 samples of raw pork belly in concentrations ranging from 150 to 450 ppb, and cysteine was found in all samples in concentrations ranging from 2.4 to 36.5 ppm. Analysis for the thiols and their corresponding nitrosamines— NTHZ and NTHZC—of bacon before and after processing showed no correlation between cysteamine and cysteine levels before processing nor with nitrosamine levels after processing. Liquid chromatography with electrochemical detection was found to be an extremely selective technique to measure the 2 free sulfhydryl compounds in a complex food substrate.

Deformation Replication

1970 ◽  
Vol 28 ◽  
pp. 280-281
Author(s):  
J. Temple Black
Keyword(s):  
Cutting Speed ◽  
Machining Process ◽  
Depth Of Cut ◽  
Rake Face ◽  
Orthogonal Machining ◽  
Aluminum Chips ◽  
Before And After ◽  
Materials Used ◽  
Glass Knife ◽  
Very High

Tool materials used in ultramicrotomy are glass, developed by Latta and Hartmann (1) and diamond, introduced by Fernandez-Moran (2). While diamonds produce more good sections per knife edge than glass, they are expensive; require careful mounting and handling; and are time consuming to clean before and after usage, purchase from vendors (3-6 months waiting time), and regrind. Glass offers an easily accessible, inexpensive material ($0.04 per knife) with very high compressive strength (3) that can be employed in microtomy of metals (4) as well as biological materials. When the orthogonal machining process is being studied, glass offers additional advantages. Sections of metal or plastic can be dried down on the rake face, coated with Au-Pd, and examined directly in the SEM with no additional handling (5). Figure 1 shows aluminum chips microtomed with a 75° glass knife at a cutting speed of 1 mm/sec with a depth of cut of 1000 Å lying on the rake face of the knife.

The Clinical, Roentgenological and Morphological Effects of an Acute Exposure of Phosgene on the Lungs of Dogs

1971 ◽  
Vol 29 ◽  
pp. 236-237
Author(s):  
R. F. Bils ◽  
W. F. Diller ◽  
F. Huth
Keyword(s):  
Latent Period ◽  
Chemical Industry ◽  
Toxic Substance ◽  
Lung Edema ◽  
X Rays ◽  
Beagle Dogs ◽  
Male And Female ◽  
Morphological Alterations ◽  
Before And After ◽  
Electron Microscopes

Phosgene still plays an important role as a toxic substance in the chemical industry. Thiess (1968) recently reported observations on numerous cases of phosgene poisoning. A serious difficulty in the clinical handling of phosgene poisoning cases is a relatively long latent period, up to 12 hours, with no obvious signs of severity. At about 12 hours heavy lung edema appears suddenly, however changes can be seen in routine X-rays taken after only a few hours' exposure (Diller et al., 1969). This study was undertaken to correlate these early changes seen by the roengenologist with morphological alterations in the lungs seen in the'light and electron microscopes.Forty-two adult male and female Beagle dogs were selected for these exposure experiments. Treated animals were exposed to 94.5-107-5 ppm phosgene for 10 min. in a 15 m3 chamber. Roentgenograms were made of the thorax of each animal before and after exposure, up to 24 hrs.

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