scholarly journals VLIV LITOLOGIE A MORFOLOGIE VYSOKOGRADIENTOVÝCH KORYT NA DNOVÉ SEDIMENTY: PŘÍKLADOVÁ STUDIE VODNÍHO TOKU KOBYLSKÁ (VSETÍNSKÉ VRCHY, ČESKÁ REPUBLIKA)

2018 ◽  
Vol 25 (1-2) ◽  
Author(s):  
Tereza Macurová ◽  
Václav Škarpich ◽  
Tomáš Galia
Keyword(s):  
Inverse Correlation ◽  
Bank Failures ◽  
Bed Sediment ◽  
Fluvial Systems ◽  
High Gradient ◽  
Control Structures ◽  
Grain Sizes ◽  
Steep Part ◽  
Outer Western Carpathians ◽  
Mountainous Landscapes

High-gradient streams are integral parts of the fluvial systems, which connect the mountainous landscapes with lowland rivers in the sense of water and sediment transport. We analysed downstream grain-size characteristics of bed sediments and sphericity of grains with respect to the local flysch lithology and channel geometry in the 5.4 km long reach of the high-gradient Kobylská Stream (the Vsetín highlands, Outer Western Carpathians, Czech Republic). Results showed a high variability of bed-sediment sizes in the longitudinal course of the Kobylská stream. This condition is given by the occurrence of anthropogenic impact in the studied channel (local bank stabilisations, grade-control structures) and lateral sediment input from the adjacent landslides and bank failures. The lithology of the flysch nappe structure of the basin significantly influenced variations of bed sediment grain-sizes. Different bedrock resistance resulted into inverse correlation between the local river gradient and related bed grain-sizes. Especially the mudstone bedrock layers had significant impact on the fining of bed sediment in the upper steep part of the basin (D50 ≤ 40 mm) and by contrast, sandstone bedrock caused the coarsening of the bed sediment in the middle and lower parts (D50 up to 50 mm) characterised by lower bed gradients.

Grain sizes retained by diatom biofilms during erosion on tidal flats linked to bed sediment texture

2015 ◽  
Vol 104 ◽  
pp. 37-44 ◽  
Author(s):  
Jessica C. Garwood ◽  
Paul S. Hill ◽  
Hugh L. MacIntyre ◽  
Brent A. Law
Keyword(s):  
Tidal Flats ◽  
Bed Sediment ◽  
Sediment Texture ◽  
Grain Sizes

scholarly journals Ash leachates from some recent eruptions of Mount Etna (Italy) and Popocatépetl (Mexico) volcanoes and their impact on amphibian living freshwater organisms

2015 ◽  
Vol 12 (16) ◽  
pp. 13241-13282 ◽  
Author(s):  
M. D'Addabbo ◽  
R. Sulpizio ◽  
M. Guidi ◽  
G. Capitani ◽  
P. Mantecca ◽  
...  
Keyword(s):  
Grain Size ◽  
Xenopus Laevis ◽  
Inverse Correlation ◽  
The Other ◽  
Mount Etna ◽  
Lake Ohrid ◽  
Grain Sizes ◽  
Freshwater Organisms ◽  
High Dilutions ◽  
Leaching Experiments

Abstract. Leaching experiments were carried out on fresh ash samples from Popocatépetl 2012, Etna 2011 and 2012 eruptions, in order to investigate the release of compounds in both double-deionised and lake (Ohrid lake, FYR of Macedonia) waters. The experiments were carried out using different grain sizes and variable time of stirring (from 30 min to 7 days). Results were discussed in the light of changing pH and release of compounds for the different leachates. In particular, Etna samples induced alkalinisation and Popocatépetl samples induced acidification of the corresponding leachates. The release of different elements does not show correlation with time of stirring, with the measured maximum concentrations reached in the first hours of washing. General inverse correlation with grain size was observed only for Na+, K+, Cl−, Ca2+, Mg2+, SO42−, and Mn2+, while the other analysed elements show complex, scattering relationship with grain size. Geochemical modelling highlights leachates saturation only for F and Si, with Popocatépetl samples sometimes showing saturation in Fe. The analysed leachates are classified as undrinkable for humans on the basis of Italian laws, due to excess in F−, Mn2+, Fe, and SO42− (the latter only for Popocatépetl samples). Finally, the Etna 2012 and Popocatépetl leachates were used for toxicity experiments on living biota (Xenopus laevis). They are mild toxic, and no significant differences exist between the toxic profiles of the two leachates. In particular, no significant embryo mortality was observed, while even at high dilutions the leachates produced more than 20 % of malformed larvae.

scholarly journals Ash leachates from some recent eruptions of Mount Etna (Italy) and Popocatépetl (Mexico) volcanoes and their impact on amphibian living freshwater organisms

2015 ◽  
Vol 12 (23) ◽  
pp. 7087-7106 ◽  
Author(s):  
M. D'Addabbo ◽  
R. Sulpizio ◽  
M. Guidi ◽  
G. Capitani ◽  
P. Mantecca ◽  
...  
Keyword(s):  
Grain Size ◽  
Inverse Correlation ◽  
The Other ◽  
Mount Etna ◽  
Lake Ohrid ◽  
Grain Sizes ◽  
Freshwater Organisms ◽  
Stirring Time ◽  
High Dilutions ◽  
Leaching Experiments

Abstract. Leaching experiments were carried out on fresh ash samples from Popocatépetl 2012, Etna 2011, and Etna 2012 eruptions, in order to investigate the release of compounds in both double-deionized and lake (Lake Ohrid, FYR of Macedonia) waters. The experiments were carried out using different grain sizes and variable stirring times (from 30 min to 7 days). Results were discussed in the light of changing pH and release of compounds for the different leachates. In particular, Etna samples induced alkalinization, and Popocatépetl samples induced acidification of the corresponding leachates. The release of different elements does not show correlation with the stirring time, with the measured maximum concentrations reached in the first hours of washing. General inverse correlation with grain size was observed only for Na+, K+, Cl−, Ca2+, Mg2+, SO42−, and Mn2+, while the other analysed elements show a complex, scattering relationship with grain size. Geochemical modelling highlights leachates' saturation only for F and Si, with Popocatépetl samples sometimes showing saturation in Fe. The analysed leachates are classified as undrinkable for humans on the basis of European laws, due to excess in F−, Mn2+, Fe, and SO42− (the latter only for Popocatépetl samples). Finally, the Etna 2012 and Popocatépetl leachates were used for toxicity experiments on living biota (Xenopus laevis). They are mildly toxic, and no significant differences exist between the toxic profiles of the two leachates. In particular, no significant embryo mortality was observed; while even at high dilutions, the leachates produced more than 20 % of malformed larvae.

Reflection electron microscopy of as-grown diamond surfaces

1993 ◽  
Vol 51 ◽  
pp. 1006-1007
Author(s):  
Z.L. Wang ◽  
J. Bentley ◽  
R.E. Clausing ◽  
L. Heatherly ◽  
L.L. Horton
Keyword(s):  
Electron Microscopy ◽  
Synthetic Diamond ◽  
High Energy ◽  
Dark Field ◽  
Reverse Direction ◽  
Diamond Surfaces ◽  
Grain Sizes ◽  
Synthetic Diamonds ◽  
De Beers ◽  
Reflection Electron Microscopy

It has been found that the abrasion of diamond-on-diamond depends on the crystal orientation. For a {100} face, the friction coefficient for sliding along <011> is much higher than that along <001>. For a {111} face, the abrasion along <11> is different from that in the reverse direction <>. To interpret these effects, a microcleavage mechanism was proposed in which the {100} and {111} surfaces were assumed to be composed of square-based pyramids and trigonal protrusions, respectively. Reflection electron microscopy (REM) has been applied to image the microstructures of these diamond surfaces.{111} surfaces of synthetic diamond:The synthetic diamonds used in this study were obtained from the De Beers Company. They are in the as-grown condition with grain sizes of 0.5-1 mm without chemical treatment or mechanical polishing. By selecting a strong reflected beam in the reflection high-energy electron diffraction (RHEED) pattern, the dark-field REM image of the surface is formed (Fig. 1).

Clinical factors correlated with vitamin D deficiency in patients with obesity scheduled for bariatric surgery: A single center experience

2020 ◽  
Vol 90 (3-4) ◽  
pp. 346-352
Author(s):  
Vincenzo Pilone ◽  
Salvatore Tramontano ◽  
Carmen Cutolo ◽  
Federica Marchese ◽  
Antonio Maria Pagano ◽  
...  
Keyword(s):  
Bariatric Surgery ◽  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Serum Vitamin ◽  
Inverse Correlation ◽  
Model Assessment ◽  
Cross Sectional ◽  
Serum Vitamin D ◽  
Female Sex ◽  
Vitamin D Levels

Abstract. We aim to assess the prevalence of vitamin D deficiency (VDD) in patients scheduled for bariatric surgery (BS), and to identify factors that might be associated with VDD. We conducted a cross-sectional observational study involving all consecutive patients scheduled for BS from 2017 to 2019. The exclusion criteria were missing data for vitamin D levels, intake of vitamin D supplements in the 3 months prior to serum vitamin D determination, and renal insufficiency. A total of 206 patients (mean age and body mass index [BMI] of 34.9 ± 10.7 years, and 44.3 ± 6.99 kg/m2, respectively) met the inclusion criteria and were enrolled for data analysis. VDD (<19.9 ng/mL), severe VDD (<10 ng/mL), and vitamin D insufficiency (20–29.9 ng/mL) were present in 68.8 %, 12.5 %, and 31.2 % of patients, respectively. A significant inverse correlation was found between vitamin D levels and initial BMI, parathyroid hormone, and homeostatic model assessment of insulin resistance (r = −0.280, p < 0.05; r = −0.407, p = 0.038; r = −0.445, p = 0.005), respectively. VDD was significantly more prevalent in patients with higher BMI [−0.413 ± 0.12, CI95 % (−0.659; −0.167), p = 0.006], whereas no significant association between hypertension [−1.005 ± 1.65, CI95 % (−4.338; 2.326), p = 0.001], and diabetes type 2 (T2D) [−0.44 ± 2.20, CI95 % (−4.876; 3.986), p = 0.841] was found. We observed significant association between female sex and levels of vitamin D [6.69 ± 2.31, CI95 % (2.06; 11.33), p = 0.006]. The present study shows that in patients scheduled for BS, VDD deficiency is common and was associated with higher BMI, and female sex.

Early Warning Models for Bank Failures: Lessons from the Late 2000s Great Recession

2012 ◽  
Author(s):  
Xiaofei Li ◽  
Cesar L. Escalante ◽  
James E. Epperson ◽  
Lewell F. Gunter
Keyword(s):  
Early Warning ◽  
Great Recession ◽  
Bank Failures

Nativer 99mTc-Uptake in der Differentialdiagnostik von unauffälliger Schilddrüse, Struma mit Euthyreose und Schilddrüsenautonomie in einem Jodmangelgebiet

1990 ◽  
Vol 29 (03) ◽  
pp. 113-119
Author(s):  
C. R. Pickardt ◽  
K. Horn ◽  
G. Bechtner ◽  
C. Vaitl ◽  
C. M. Kirsch ◽  
...  
Keyword(s):  
Urinary Iodine ◽  
Inverse Correlation ◽  
Iodine Concentration ◽  
Urinary Iodine Excretion ◽  
Large Scatter ◽  
Spot Urine ◽  
Iodine Supply ◽  
Iodine Contamination ◽  
Iodine Excretion ◽  
Overt Hyperthyroidism

Global TcTU was determined in 568 patients without any specific thyroid drug intake - 54 with normal thyroid, 274 with goitre and euthyroidism and 240 with thyroid autonomy. 57 patients with autonomy and overt hyperthyroidism were the only group with TcTU values significantly higher than normals. Common to all groups was a large scatter of the TcTU values. In 332, the effects of individual iodine supply were studied by measuring the iodine concentration in spot urine samples. There was a significant inverse correlation between the TcTU values and the urinary iodine excretion in the groups of normal thyroids and of goitres with euthyroidism. In the group with autonomy an effect of iodine supply could only be seen in cases of greatly increased urinary iodine excretion, resulting in very low TcTU values. Out of 20 patients with autonomy and iodine contamination, only 4 showed overt hyperthyroidism. The large scatter of TcTU values in all groups may be explained by the persistent iodine deficiency as well as by the frequent exposure to unknown amounts of iodine in patients with thyroid disease. Therefore, the spontaneous TcTU alone cannot identify a small group of patients with autonomy and high risk of iodine-induced hyperthyroidism, from a very large group of patients with goitre.

High Levels of Plasma Protein C in Nephrotic Syndrome

1985 ◽  
Vol 53 (01) ◽  
pp. 005-007 ◽  
Author(s):  
I Pabinger-Fasching ◽  
K Lechner ◽  
H Niessner ◽  
P Schmidt ◽  
E Balzar ◽  
...  
Keyword(s):  
Nephrotic Syndrome ◽  
Plasma Protein ◽  
Protein C ◽  
Inverse Correlation ◽  
Elevated Plasma ◽  
Significant Inverse Correlation ◽  
At Iii ◽  
Thrombotic Tendency ◽  
Protein C Activity

SummaryIn patients with severe nephrotic syndrome determinations of plasma protein C : Ag levels (8 patients: 5 adults, 3 children) and protein C activity (3 out of 8 patients) revealed significantly elevated plasma protein C concentrations. Furthermore we observed a significant inverse correlation of protein C : Ag to AT III : Ag levels. No protein C : Ag could be detected in the urine of two patients studied. We conclude from our data, that changes of plasma protein C do not contribute to the high thrombotic tendency in nephrotic syndrome.

Sign in / Sign up

Export Citation Format

Share Document