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1
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The use of ultrasonic treatment for improvement of metrological performance of sorption atomic absorption determination of lead(II) and cadmium(II) traces

100%
Alemasova A., Belova E.
Open Chemistry
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2010
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vol. 8
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issue 1
58-64
EN
The optimal parameters for ultrasonic treatment (frequency 200–300 kHz, intensity 2–4 W cm−2) were obtained to intensify Pb(II) and Cd(II) sorption concentration by carbon sorbent from apricot pit. The combined action of ultrasonic frequency of 18 kHz and 1 MHz on concentrate slurry increases its sedimentation stability from 3 to 180 minutes and decreases Sr value up to 7% at Pb(II), Cd(II) hybrid sorption atomic absorption determination in natural waters, brines, common salt. [...]
2
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Sono-extraction as a pretreatment approach for the screening evaluation of element mobility of sediment samples

80%
Blašková J., Vojteková V., Nováková J., Mackových D., Bazeľ Y., Lapčík L., Poperníková Z., Abusenaina A.
Open Chemistry
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2013
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vol. 11
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issue 7
1201-1212
EN
Application of economically important and time saving pretreatment for the screening element mobility evaluation of contaminated sediments is presented. Ultrasonically-assisted single-step extraction (USAE) was carried out by EDTA solution. The extraction time of USAE was optimized and obtained results were compared with results estimated by conventional (EDTA extraction) and by sequential extraction (modified BCR protocol). The original three step BCR protocol was modified by addition of the first step (water leaching) and the fifth step, total digestion of sediment residue (acid mixture with HF). Zn, Cu and Pb have been determined in extracts by ICP-OES. Good conformity of the ultrasonically-extracted element contents and sum of contents, extracted during first three steps (water-soluble, acid-extractable, reducible - i.e., the most mobile fractions) of sequential extraction, was found. The sono-extraction reduced operating time of the first three steps of sequential extraction from 48 h to 15 min. Thus, USAE can serve as a rapid screening assessment of the mobile and potentially mobile element portions in sediments and other similar solid state environmental media. Analytical quality control was realized by comparison of the sums of element contents obtained at individual (five) extraction steps. Total element contents were also determined by an independent method (XRF).
3
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Analytical sonochemistry; developments, applications, and hyphenations of ultrasound in sample preparation and analytical techniques

80%
Seidi S., Yamini Y.
Open Chemistry
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2012
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vol. 10
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issue 4
938-976
EN
Ultrasonic assistance is one of the great successes of modern analytical chemistry, which uses this energy for a variety of purposes in relation to sample preparation and development of methods for the analysis of numerous contaminants including organic and inorganic compounds. This review will attempt to provide an overview of more recent applications of ultrasound in different environmental and biological samples such as food, soil and water as well as a brief description of the theoretical understanding of this method. Also, the possibility of coupling ultrasound with other analytical techniques will be discussed. [...]
4
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The value of transabdominal ultrasound for assessment of the severity of liver steatosis as compared to liver biopsy

80%
Sporea I., Şirli R., Başa E., Cornianu M., Popescu A., Dănilă M., Focşa M.
Open Medicine
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2009
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vol. 4
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issue 4
490-495
EN
The purpose of our paper was to evaluate the performance of ultrasound (US) for assessment of the severity of liver steatosis as compared to a pathological examination, which is presently considered to be the gold standard, in patients that have undergone liver biopsy for various reasons. We performed echo-assisted liver biopsy in 161 patients with chronic hepatitis with the US aspect of “bright liver” with “posterior attenuation”, using modified Menghini needles. Following the US examination, the severity of liver steatosis was estimated as minimal, mild, moderate. or severe according to the Hepburn classification: absent (affecting 0% to 2% of the hepatocytes), minimal (2% to 10%), mild (10% to 30%), moderate (30% to 60%), and severe (more than 60% of the hepatocytes). The results of this study showed that the sensitivity of US for the prediction of histological steatosis of at least moderate severity was 0.64, with 0.77 specificity, 0.55 positive predictive value, and 0.94 negative predictive value. The overall accuracy was 0.75. This study showed that the transabdominal ultrasound evaluation of the fatty liver is a quite good predictor, perhaps sufficient for most purposes, for the estimation of the severity of liver steatosis in the moderate to severe range.
5
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ZrOCl2 · 8H2O: An efficient catalyst for rapid one-pot synthesis of 3-carboxycoumarins under ultrasound irradiation in water

80%
Bardajee G., Jafarpour F., Afsari H.
Open Chemistry
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2010
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vol. 8
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issue 2
370-374
EN
In this report, a rapid, efficient and environmental friendly synthesis of 3-carboxycoumarins under ultrasound irradiation in water media is described. The Knoevenagel condensation of Meldrum’s acid with substituted benzaldehydes in the presence of zirconium oxide chloride (ZrOCl2·8H2O) and ultrasonic irradiation in water gave the corresponding 3-carboxycoumarins in good to excellent yields. [...]
6
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Ultrasonography of the uterus within 6 weeks following Cesarean section

70%
Dosedla E., Kvasnička T., Calda P.
Open Medicine
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2012
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vol. 7
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issue 2
235-240
7
Content available remote

Paraurethral cyst: a case report

70%
Ceyhan M., Nural M., Oztas T., Bayrak İ., Rizalar R.
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EN
Paraurethral or Skene’s duct cyst is a rare cause of masses located in the inter-labial genitor-urinary region and their etiology is not fully known. These congenital cysts may be diagnosed easily by inspection in the initial physical examination of the new-borne. Radiological evaluation is helpful for differential diagnosis and in determining the proximal extension of the cystic pathology. Treatment alternatives are needle aspiration and non-surgical follow-ups leading to a spontaneous regression and surgery. In this report the radiological findings of a female newborn diagnosed with paraurethral cyst in US and MR examinations have been discussed.
8
Content available remote

An overview on the application of ultrasound in extraction, separation and purification of plant polysaccharides

70%
Ebringerová A., Hromádková Z.
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EN
In view of the recent emphasis on non-conventional chemistry, application of ultrasound in isolation of plant polysaccharides represents a viable alternative to traditional extraction processes. This review presents an extensive literature survey of ultrasound-assisted extraction of polysaccharides from different plant materials, particularly herbal plants and secondary agricultural plant sources. Targeted, multistep methods were applied with respect to differences in the types of polysaccharides and their location in plant cell walls. The effectiveness of the methods was evaluated according to yield and properties of the isolated polysaccharides in comparison to classical extraction methods. Substantial shortening of extraction time, reduction of reagent consumption and/or extraction temperature are the most important advantages of the ultrasonic treatment. In combination with sequential extraction steps using different solvents, sonication was shown to be effective in separation and/or purification of polysaccharides. The disadvantages of the sonication treatment, such as degradation and compositional changes of the polysaccharide preparations are discussed as well.
9
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The Influence of Using Different Types of Risers or Chills on Shrinkage Production for Different Wall Thickness for Material EN-GJS-400-18LT

61%
Vasková I., Hrubovčáková M., Conev M.
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issue 2
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