scholarly journals Research of Soil Intrusion Depth of Crude Oil upon Emergency Spills of Oil Products

2021 ◽  
Vol 133 (2) ◽  
pp. 47-49
Author(s):  
H. M. Nasirov ◽  
Keyword(s):  
Crude Oil ◽  
Oil Products ◽  
Time Interval ◽  
Method Of Averaging ◽  
Optimum Temperature ◽  
Liquid Hydrocarbons ◽  
The Mean ◽  
Intrusion Depth

The task regarding determination of optimum temperature upon which the oil products soil intrusion depth reaches minimum is formulated and solved. It is noted that increase of temperature enhance vaporization of liquid hydrocarbons from one side which leads to decrease of intrusion depth and from another side increase speed of intrusion into soil which increase the intrusion depth. As a result the mean depth of intrusion calculated using method of averaging these factors effects has a minimum in some value of temperature. It is shown that this minimum is proportional to logarithm of time interval passed after spill event.

Determination of the Distribution Patterns and Abundances of Trace Elements in Nigerian Crude Oil Using the AAS Technique

2011 ◽  
Vol 5 ◽  
pp. 64-73
Author(s):  
O.D. Nworgu ◽  
O.D. Osahon
Keyword(s):  
Trace Elements ◽  
Crude Oil ◽  
Distribution Patterns ◽  
American Petroleum Institute ◽  
Oil Wells ◽  
Oil Well ◽  
Analytical Technique ◽  
The Mean ◽  
Atomic Absorption Spectrometric

Crude oil samples from four oil wells in Nigeria were analyzed for the following seven trace elements: V, Cr, Mn, Fe, Co, Ni and Pb using Atomic Absorption Spectrometric (AAS) analytical technique. The mean concentrations of these elements on a weight to weight basis were found to range from 0.017 ± 0.005 to 1.977 ± 0.397ppm. The results also show that V was the most abundant metal with Ovia 1 Long String (OLS) Oil well containing the highest concentration of V. The V/Ni ratio from the method used shows that Ovia 1 Long String (OLS) and Ovia 1 Short String (OSS) were the most and the least matured oil wells respectively. All the samples had comparably the same V/Ni ratio (1.16—1.77) implying identical source for all the oils. Furthermore, the calculated values of American Petroleum Institute (°API) gravity determined using the measurement of specific gravity (S.G.) of the crude oil samples range from 47.80 to 55.50. This suggests that the samples fall into one category of crude oil classification which in this case is light crude.

Kontinuierliche Sensitivitätssteigerung in der Schilddrüsenkarzinom-Nachsorge im Verlauf dreier Thyreoglobulin-IMA-Generationen

2003 ◽  
Vol 42 (04) ◽  
pp. 157-166 ◽  
Author(s):  
K. Brandt-Mainz ◽  
L. Freudenberg ◽  
A. Frilling ◽  
W. Grimm ◽  
A. Bockisch ◽  
...  
Keyword(s):  
Close Correlation ◽  
Differentiated Thyroid Carcinoma ◽  
Time Interval ◽  
Serum Samples ◽  
The Past ◽  
Ultrasensitive Assay ◽  
Reference Preparation ◽  
The Mean

Summary: Aim of our study was to evaluate the increasing sensitivity within three generations of thyroglobulin (Tg) as-says, which were available during the past decade, and its clinical impact for patients with differentiated thyroid carcinoma. Methods: Determination of Tg using the IRMA introduced in 1989 (Dynotest®Tg, Henning Berlin, Berlin; assay A) and 1994 (Selco®Tg, Medipan Diagnostica, Selchow; assay B), as well as the IEMA available recently (Medizym®Tg Rem, Medipan Diagnostica, Selchow; assay C). Results: We found a close correlation between the measurable Tg values of assay A and B (r = 0.985; p <0.001) as well as assay B and C (r = 0.978; p <0.001). Assay B (lowest detection limit: 0.3 ng/ml) was more than twice as sensitive as assay A and did not show quite as many disturbances of recovery (in 0.5% versus 4% of our patients). Due to its strict calibration to the European reference preparation CRM 457, Tg values determined by assay C were in the mean 1.9-fold higher than by assay B. Thus, with its functional sensitivity of 0.03 ng/ml assay C is nearly 20-fold more sensitive than assay B. Whereas the proportion of measurable Tg values was only 22% in a selected group of patients (criterion of inclusion: Tg in assay B ≤1 ng/ml with TSH-suppressive conditions; n = 317 serum samples from 103 patients), it was 68% in assay C, with good intraindividual reproducibility of these values in the course. Conclusion: The ultrasensitive assay C is especially suitable for the follow-up of treated thyroid cancer patients being considered as cured, and may shorten the time interval until the detection of a recurrence markedly: the gain of time calculated from the Tg courses in patients with a gradually progressive tumor relapse ranged from 5 to 15 months.

scholarly journals Screening for patients with Gaucher’s disease using routine pathology results: PATHFINDER (ferritin, alkaline phosphatase, platelets) study

2021 ◽  
Author(s):  
Tim Reynolds ◽  
Anthony Wierzbicki ◽  
Volha Skrahina ◽  
Christian Beetz
Keyword(s):  
Alkaline Phosphatase ◽  
Gaucher Disease ◽  
Clinical Biochemistry ◽  
Mean Value ◽  
Time Interval ◽  
Pathogenic Variants ◽  
Gba Gene ◽  
The Mean ◽  
Laboratory Biomarkers

Aims: Lysosomal β-glucocerebrosidase (GBA) deficiency causes Gaucher disease (GD), a recessive disorder caused by bi-allelic mutations in GBA. The prevalence of GD is associated with ethnicity, but largely unknown and potentially underestimated in many countries. GD may manifest with organomegaly, bone involvement and neurological symptoms as well as abnormal laboratory biomarkers. This study attempted to screen for GD in patients using abnormal platelet, alkaline phosphatase (ALP) and ferritin results from laboratory databases. Methods: Electronic laboratory databases were interrogated using a 2-4 year time interval to identify from clinical biochemistry records patients with a phenotype of reduced platelets (<150x109/L) and either elevated ALP (>130iu/L) or ferritin (>150 (female) or >250µg/L(male)). The mean value over the screening window was used to reduce variability in results. A dried blood spot sample was collected for the determination of GBA activity in patients meeting these criteria. If low GBA activity was found then the concentration of the GD-specific biomarker glucosyl-sphingosine (lyso-GB1) was assayed, and the GBA gene sequenced. Results: Samples were obtained from 1058 patients; 232 patients had low GBA activity triggering further analysis. No new cases of GD with homozygosity for pathogenic variants were identified but 12 patients (1%) were identified to be carriers of a pathogenic variant in GBA. Conclusions: Pathology databases hold routine information that can be used to screen for patients with inherited errors of metabolism. However, biochemical screening using mean platelets, ALP and ferritin has a low yield for unidentified cases of Gaucher Disease.

Detection of Circulating Tissue Factor and Factor VII in a Normal Population

1996 ◽  
Vol 75 (05) ◽  
pp. 772-777 ◽  
Author(s):  
Sybille Albrecht ◽  
Matthias Kotzsch ◽  
Gabriele Siegert ◽  
Thomas Luther ◽  
Heinz Großmann ◽  
...  
Keyword(s):  
Tissue Factor ◽  
Normal Population ◽  
Mean Value ◽  
Factor Vii ◽  
Significant Difference ◽  
Age Dependent ◽  
The Mean ◽  
Highly Correlated ◽  
And Gender

SummaryThe plasma tissue factor (TF) concentration was correlated to factor VII concentration (FVIIag) and factor VII activity (FVIIc) in 498 healthy volunteers ranging in age from 17 to 64 years. Immunoassays using monoclonal antibodies (mAbs) were developed for the determination of TF and FVIIag in plasma. The mAbs and the test systems were characterized. The mean value of the TF concentration was 172 ± 135 pg/ml. TF showed no age- and gender-related differences. For the total population, FVIIc, determined by a clotting test, was 110 ± 15% and the factor VIlag was 0.77 ± 0.19 μg/ml. FVII activity was significantly increased with age, whereas the concentration demonstrated no correlation to age in this population. FVII concentration is highly correlated with the activity as measured by clotting assay using rabbit thromboplastin. The ratio between FVIIc and FVIIag was not age-dependent, but demonstrated a significant difference between men and women. Between TF and FVII we could not detect a correlation.

Determination of Plasminogen in Clots and Thrombi

1966 ◽  
Vol 16 (01/02) ◽  
pp. 038-050 ◽  
Author(s):  
Ulla Hedner ◽  
Inga Marie Nilsson ◽  
B Robertson
Keyword(s):  
Mean Value ◽  
Main Mechanism ◽  
Clot Lysis ◽  
Post Mortem ◽  
Digestion Time ◽  
Normal Volunteers ◽  
Casein Solution ◽  
The Mean

SummaryThe plasminogen content was determined by a casein method in plasma and serum from 20 normal volunteers. The mean plasminogen content was found to be 10.1 ACU (the arbitrary caseinolytic unit defined in such a way that using a 3% casein solution and a digestion time of 20 min. at 37°C, 10 ACU gave an extinction of 0.300). No difference between serum and plasma regarding the plasminogen content was found.Plasminogen was determined in drained and drained plus washed clots prepared from 2 ml plasma. The highest values found in the drained clots were 0.9 ACU/clot and 0.2 ACU/clot in the drained plus washed clots.Plasminogen was also determined in drained and drained plus washed clots prepared from plasma with added purified plasminogen. The plasminogen was recovered in the washing fluid. According to these tests, then, purified added plasminogen is washed out of the clots.The plasminogen content of 20 thrombi obtained post mortem was also determined. The mean value was found to be 0.7 ACU/cm thrombus. Judging from our results, the “intrinsic clot lysis theory” is not the main mechanism of clot dissolution.

SERUM TRIIODOTHYRONINE DETERMINATION BY SATURATION ANALYSIS

1973 ◽  
Vol 72 (4) ◽  
pp. 714-726 ◽  
Author(s):  
A. Burger ◽  
B. Miller ◽  
C. Sakoloff ◽  
M. B. Vallotton
Keyword(s):  
Ionic Strength ◽  
Limit Of Detection ◽  
Improved Method ◽  
Accuracy Of Measurement ◽  
Tracer Amount ◽  
The Mean ◽  
Physiological Values ◽  
Hyperthyroid Patients ◽  
Solvent Blank

ABSTRACT An improved method for the determination of serum triiodothyronine (T3) has been developed. After addition of a tracer amount of the hormone, T3 was extracted from 1 ml serum under conditions of pH and ionic strength which favoured T3 extraction (89%) over thyroxine (T4) extraction (58%). Chromatography of the extracted material on Sephadex LH-20 separated T3 completely from residual T4. The T3 eluate was dried, then re-dissolved in 0.5 ml NaOH 0.04 n. To 0.2 ml duplicate aliquots, a standard amount of TBG was added for the competitive protein analysis. After one hour incubation at 4°C, separation of bound from free T3 was achieved on small Sephadex G-25 columns. Overall recovery was 67 ± 10.8% and correction for the loss was made. The solvent blank was 37 ± 27 (sd) ng/100 ml. Accuracy of measurement of known quantities of T3 added to serum was 98.4%. The coefficient of variation within the assay was 6.2% and between the assays it was 11.4%. The limit of detection (0.1 ng) corresponded to a concentration of 25 ng/100 ml. T4 added to serum did not interfere with T3 determination until high non-physiological values were reached. The mean ± sd serum T3 in 54 euthyroid subjects was 153 ± 58 ng/100 ml and in 24 hyperthyroid patients it was 428 ±186 ng/100 ml; 4 out of the 24 hyperthyroid values were within 2 sd of the mean euthyroid group. All the values found in the euthyroid group were well above the limit of detection of the method.

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