Laser-induced breakdown spectra (LIBS) were collected on a diverse suite of ∼2,600 geological standards using four laser energies (2.4–7.2 mJ) to assess how variations in irradiance from stand-off distance affect prediction accuracy. Mismatches and plasma temperatures between training datasets introduce substantial uncertainty major element predictions. For example, 2.4 mJ predict 7.2 data resu...

This study was aimed at investigating the effects of 0%, 20%, 40%, 60%, 80% and 100% load powdered Khaya ivorensis [heartwood] on proximate analysis, elemental analysis calorific value coal briquette results were compared with that blank samples. Ignition combustion properties determined using standard methods. The for pulverized showed moisture content (%) 6.8 12.3: ash 16.8 1.73: volatile mat...

This paper describes the findings of selenium measurement in three types of soil (semigley, pseudogley and hypogley) and in wheat grain cultivated in these types of soil in the vicinity of Koprivnica using hydrid atomic absorption spectrometry. The results showed relatively low selenium levels in all three types of soil (145-333 micrograms Se/kg dry weight) as well as the wheat grain (22-62 mic...

background: atherosclerosis is the most common cause for heart attack and stroke. in the last decade, several epidemiological studies have found an association between periodontal infection and atherosclerosis. the aim of this research was to determine the possible association between chronic periodontal disease and severity of atherosclerosis. materials and methods: eighty‑two subjects that we...

Glycerol is an attractive renewable building block for the synthesis of polyglycerols, which find application in the cosmetic and pharmaceutical industries. The selective etherification of glycerol to higher oligomers was studied in the presence of CaO colloids and the data are compared with those obtained from NaOH and CaO. The materials were prepared by dispersing CaO, CaCO3 , or Ca(OH)2 onto...

The genome of the ascomycete Neurospora crassa encodes CAO-1 and CAO-2, two members of the carotenoid cleavage oxygenase family that target double bonds in different substrates. Previous studies demonstrated the role of CAO-2 in cleaving the C40 carotene torulene, a key step in the synthesis of the C35 apocarotenoid pigment neurosporaxanthin. In this work, we investigated the activity of CAO-1,...

calcite and possibly other carbonates which coat he surfaces of cleats. If the calcite is not removed by washing then it adds CaO lo that already in the ash. If the ash concentration is low then this addition of CaO can cause the concentration in the ash to rise markedly. The mineralogy of the ash ensures that it also contains some CaO. The concentration of this component of the CaO probably...