Photoinitiated radical polymerization may be initiated by both α-cleavage (Type I) and H-abstraction (TypeII) initiators [ 1 ]. TypeII photoinitiators are a second class of photoinitiators and are based on
Authors:A. Mesterházy, B. Tóth, T. Bartók, and M. Varga
Buerstmayr, H., Lemmens, M., Hartl, L., Doldi, L., Steiner, B., Stierschneider, M., Ruckenbauer, P. 2002. Molecular mapping of QTL for Fusarium head blight resistance in spring wheat. I. Resistance to fungal spread (typeII resistance). Theor. Appl. Genet
Authors:J. Dweck, P. Ferreira da Silva, P. Büchler, and F. Cartledge
Thermogravimetry (TG) and derivative thermogravimetry (DTG) have been used by the authors as very effective tools to study hydration steps of cements used for solidification/stabilization of tanning wastes. The present paper presents a method which was applied to separate the peaks shown by DTG curves of type II Portland cement pastes, analyzed at different times during the first 4 weeks of setting. Through a specific software a more detailed study of the evolution of the cement hydration may be done, which allows the measurement of the amount of hydrated water present in tobermorite gel as well as in ettringite, which are the main phases formed from the original components of the cement. The number of moles of water present in the ettringite phase calculated by the method is in very good agreement with the values found in the literature, validating the method to calculate the same parameter in tobermorite gel. In the latter case the water content decreases significantly during the first day of hydration, then remains at a constant value over the rest of the analyzed period.
Authors:Uppuluri Mallavadhani, Satyabrata Mohapatra, and Anita Mahapatra
An HPTLC method has been established for rapid and simple quantitative determination of corosolic acid, a type-II (non-insulin dependant) anti-diabetic agent found in the plant
. To identify the high-yielding parts of the plant, different tissues, for example leaf, stem, stem bark, root, heartwood, calyx, and fruit were extracted with 80% ethanol. The extracts were chromatographed on aluminum plates coated with silica gel 60F
, with chloroform-methanol 8.5:1.5 (
) as mobile phase. Densitometric quantification of corosolic acid was performed in absorbance mode at 366 nm after derivatization. Amounts of corosolic acid in the different samples were calculated by use of the regression equations (
= 0.99603) of calibration plots, which showed there was a good linear relationship between peak area and amount of corosolic acid in the range 0.5–4.5 μg. The limits of detection (LOD) and quantitation (LOQ) were 6 and 16 ng, respectively. The method was validated for precision, repeatability, and accuracy. Recovery was determined by spiking samples with corosolic acid standard before and after extraction and found to be in the range 95.80–97.13%. The maximum corosolic acid content (0.89%) was found in the leaves.
Authors:A. Cherem da Cunha, J. Gonçalves, P. Büchler, and J. Dweck
The cement industry is one which most emits polluting gases to the environment, due to the calcium carbonate calcination,
as well as to the burning of fossil fuels during the manufacturing process. Metakaolin (MK), in partial substitution to cement
in its applications, is having a special worldwide growing role, for the technological increment due to its pozzolanic activity
and mainly to the reduction of those emissions. In the present paper, the effect of pozzolanic activity of metakaolin was
analyzed by thermal analysis in pastes and mortars of type II Portland cement in the first three days of the hydration, during
which, relevant initial stages of the hydration process occur.
By non-conventional differential thermal analysis (NCDTA), paste and mortar samples containing 0, 10, 20, 30 and 40% of metakaolin
in cement mass substitution and using a 0.5 water/(total solids) mass ratio, were evaluated. The NCDTA curves, after normalization
on cement mass basis and considering the heat capacity of each reactant, indicate that the pozzolanic activity behavior of
metakaolin is different in pastes and mortars. Through the deconvolution of the normalized NCDTA curve peaks, it can be seen
that ettringuite formation increases as cement substitution degree (CSD) increases, in both cases. Tobermorite formation is
more enhanced in mortars than in pastes by MK, with a maximum formation at 30% of CSD. In the pastes, tobermorite formation
increases as CSD increases but it is practically the same at 30 and 40% of CSD.
A study was conducted on erythrocytes in order to determine the composition and concentration of elements from patients undergoing coronary artery bypass grafting (CABG) surgery with and without type II diabetes. Samples were taken at various timeperiods and analyzed by means of proton induced X-ray emission (PIXE) analysis. Elements detected reliably were P, S, Cl, K, Ca, Fe, Cu, Zn, Br and Rb. In particular, elements worthy of note are S, Cl and Ca, which have strong implications in surgical procedures and aftercare.
This paper extends previous work for decision levels to detection limits. After transforming the net count to an integer,
the probability density function for the transformed net count can be readily determined when the transformed net count is
greater than zero. The right tail of the distribution is summed and the detection limit is determined to four decimal places.
The code under discussion works well when the product of the ratio of the blank count time to the sample count time with the expected blank count in the sample count time is not greater than 100.0.
Plopper CG, St George JA, Read LC: Acceleration of alveolar typeII cell differentiation in fetal rhesus monkey lung by administration of EGF. Am. J. Physiol. 262, 313-321 (1999)
Acceleration of alveolar typeII cell
Buerstmayr, H., Lemmens, M., Hartl, L., Doldi, L., Steiner, B., Stierschneider, M., Ruckenbauer, P. 2002. Molecular mapping of QTL for Fusarium head blight resistance in spring wheat. I. Resistance to fungal spread (TypeII resistance). Theor. Appl. Genet