438 research outputs found
Mulheres mils impact assessment : building research capacity across nations; a reflection paper for the 2013 IDRC Canadian Learning Forum
Given the distinction between knowledge for understanding and knowledge for action, it is arguable that additional criteria should be considered in defining and promoting research excellence in development contexts. Research excellence for development is, or should be, rigorous, adhering to foundational standards of ethics, and as well, include knowledge for action – enhancing capacity building, and helping communities to create the capacity to act. The Mulheres Mil program (meaning a thousand strong women) successfully worked to improve women’s quality of family life, economic opportunities and greater participation in the political process
Physical work capacity of athletes with different types of adaptation of the cardiorespiratory system
Indices of physical work capacity in athletes with different types of adaptation of the cardiorespiratory system that are engaged in various kinds of sports and have sports ranks from Master of Sports to Grade 2 have been studied. It has been shown that the highest physical work capacity is typical of athletes that have the inotropic type of adaptation, and the lowest, of athletes with the chronotropic type of adaptation. High indices of physical work capacity were recorded in athletes with the respiratory type of adaptation. Types of adaptation affect the indices of physical work capacity, and it is possible to forecast sports results on their basis. © MAIK Nauka 2008
Nucleotide composition of the DNA of Listeria (Russian)
The nucleotide composition of the DNA of various L. monocytogenes and L. grayi strains was studied by means of paper cromatography. The GC content of the bases varied from 38.6 to 43.6 mol%. The minor bases (5 methylcytosine and N6 mathyladenine) were not detected. Strain differences in respect of the DNA composition were found in L. monocytogenes cultures belonging both to one and to various serologic types. Similarly to the DNA of other bacteria, DNA of Listeria possessed a low degree of pyrimidine blocking. As regards the distribution of pyrimidine blocks of various length, the DNA of Listeria differed from the DNA of Arthrobacter citreus. The data on the nucleotide composition and the character of pyrimidine distribution in the DNA of Listeria pointed to a marked difference between Listeria and other Corynebacteriaceae
Adequate hemodynamic response threshold in athletes at graduated physical loads
Objective of the study was to identify the adequate hemodynamic response threshold in athletes grouped by different cardiorespiratory system adaptation types and exposed to graduated physical loads. Graduated intensity (50 W to 200 W) cycle ergometer tests were used to apply the varying physical loads, with no rest breaks in the process. The subject athletes were grouped by different cardiorespiratory adaptation types, with the loads up to 200 W in the cycle ergometer step tests being applied for the above athletes' grouping. Based on the tests, the subjects were grouped into 5 groups based on the following cardiorespiratory system adaptation types: chronotopic, inotropic, respiratory, chronotropicrespiratory and the inotropic-respiratory type. Subject to the study were 18-35 years old men athletes (n=59) engaged in different sports and having a variety of sport qualifications from Sport Masters down to mass Class Athletes. The adequate hemodynamic response threshold was found to depend on the cardiorespiratory system adaptation types and load intensities. The higher was the adequate hemodynamic response threshold, the higher were the functional and reserve capacities of the athletes as verified by the SBV (specific blood volume) rate variations under the graduated loads. Therefore, the adequate hemodynamic response threshold may be applied as a body functional and reserve capacity indicator
Subcellular reorganization of mitochondria producing heavy DNA in aging wheat coleoptiles
AbstractUnusual closed membrane vesicles containing one or more mitochondria were isolated from homogenates of aging wheat coleoptiles. Very similar (or the same) bodies were shown to exist in situ in vacuoles of undividing cells in the apical part of intact senescent coleoptiles. Vesicles isolated from coleoptile homogenate free of nuclei by 10 min centrifugation at 1700×g and traditional mitochondria (sedimented at between 4300×g and 17 400×g) are similar in respiration rate, composition and content of cytochromes and sensitivity to respiration inhibitors. However, vesicles contain about 2-fold more Ca2+ ions than free mitochondria do. The specific feature of vesicles containing mitochondria in aging coleoptiles is an intensive synthesis of heavy (ρ=1.718 g/cm3) mitochondrial DNA (H-mtDNA). Thus, aging in plants is accompanied by an increased selective H-mtDNA production and change in subcellular organization of mitochondria
One-step synthesis of γ-Fe₂ O₃/Fe₃ O₄ nanocomposite for sensitive electrochemical detection of hydrogen peroxide
Maghemite/magnetite nanocomposite ( γ-Fe₂ O₃/Fe₃ O₄ ) was prepared via an electrochemical method using pulse alternating current and applied for electrocatalytic reduction and sensing of hydrogen peroxide. The structural and compositional analysis of the γ-Fe₂ O₃/Fe₃ O₄ was characterized by XRD, SEM, TEM and XPS. Its thermal decomposition behavior was studied using TG/DSC. The mechanism for γ- Fe₂ O₃/Fe₃ O₄ nanocomposite formation was propose
Search for EC and ECEC processes in Sn and decay of Sn to the excited states of Te
Limits on EC and ECEC processes in Sn and on
decay of Sn to the excited states of Te have
been obtained using a 380 cm HPGe detector and an external source
consisting of natural tin. A limit with 90% C.L. on the Sn half-life of
y for the ECEC(0) transition to the excited
state in Cd (1871.0 keV) has been established. This transition is
discussed in the context of a possible enhancement of the decay rate by several
orders of magnitude given that the ECEC process is nearly degenerate
with an excited state in the daughter nuclide. Prospects for investigating such
a process in future experiments are discussed. The decay
limits for Sn to the excited states of Te were obtained on the
level of y at the 90% C.L.Comment: 17 pages, 5 figure
Study of 2 beta-decay of Mo-100 and Se-82 using the NEMO3 detector
After analysis of 5797 h of data from the detector NEMO3, new limits on neutrinoless double beta decay of Mo-100 (T-1/2 > 3.1 x 10(23) y, 90% CL) and Se-82 (T-1/2 > 1.4 x 10(23) y, 90% CL) have been obtained. The corresponding limits on the effective majorana neutrino mass are: 1.4 x 10(22) y (90% CL) for Mo-100 and T-1/2 > 1.2 x 10(22) y (90% CL) for Se-82. Corresponding bounds on the Majoron-neutrino coupling constant are < (0.5-0.9) x 10(- 4) and <(0.7-1.6) x 10(- 4). Two-neutrino 2beta-decay half-lives have been measured with a high accuracy, (T1/2Mo)-Mo-100 = [7.68 +/- 0.02(stat) +/- 0.54(syst)] x 10(18) y and (T1/2Se)-Se-82 = [10.3 +/- 0.3(stat) +/- 0.7(syst)] x 10(19) y. (C) 2004 MAIK "Nauka/Interperiodica"
Possible background reductions in double beta decay experiments
The background induced by radioactive impurities of and
in the source of the double beta experiment NEMO-3 has been
investigated. New methods of data analysis which decrease the background from
the above mentioned contamination are identified. The techniques can also be
applied to other double beta decay experiments capable of measuring
independently the energies of the two electrons.Comment: 15 pages, 13 figures, accepted in the Nuclear Instruments and Methods
Nanostructured luminescently labeled nucleic acids
Important and emerging trends at the interface of luminescence, nucleic acids and nanotechnology
are: (i) the conventional luminescence labeling of nucleic acid nanostructures (e.g. DNA tetrahedron);
(ii) the labeling of bulk nucleic acids (e.g. single‐stranded DNA, double‐stranded DNA) with
nanostructured luminescent labels (e.g. copper nanoclusters); and (iii) the labeling of nucleic acid
nanostructures (e.g. origami DNA) with nanostructured luminescent labels (e.g. silver
nanoclusters). This review surveys recent advances in these three different approaches to the
generation of nanostructured luminescently labeled nucleic acids, and includes both direct and
indirect labeling methods
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