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Search Results: 1 - 10 of 223850 matches for " R. Kothe "
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HISTóRIA COMO IDEOLOGIA: A CONQUISTA DA AMéRICA NO TEATRO DO SIGLO DE ORO HISTORY AS IDEOLOGY: THE CONQUEST OF AMERICA THEATER OF THE SIGLO DE ORO
Flávio R. Kothe
Signótica , 1987, DOI: 10.5216/sig.v1i1.7182
Abstract: HISTóRIA COMO IDEOLOGIA: A CONQUISTA DA AMéRICA NO TEATRO DO SIGLO DE ORO HISTORY AS IDEOLOGY: THE CONQUEST OF AMERICA THEATER OF THE SIGLO DE ORO
A Comparative Study Of The Effect Of Isotonic And Isometric Exercises On Minimum Muscular Fitness Among Physical Education Students
R. P. Tuppekar,Chaya.Kothe
Indian Streams Research Journal , 2012,
Abstract: A lack of conclusive evidence concerning cross-transfer in isometric strength training is apparent. Information resulting from this study can help determine the nature of isometric strength gains in both ipsilateral (trained) and contralateral (untrained) limbs. This study is needed to help answer the prevailing question concerning isometric training, to add to previous research in this area, and possibly to present new thought and concepts to isometric training techniques.
Influence of Physical Education Academic Program on Personality Charities among Physical Education Students
Dr. Rajendra Tuppekar,Chaya Kothe
Indian Streams Research Journal , 2012,
Abstract: The primary objective of the study was to Influence of physical education academic program on personality characteristics among physical education students. Total 40 physical education students treated as a experimental group were selected as a subject for the presented studies & their age ranged from 22 to 30 years. No control group had been taken. Questionnaires were given to the 40 physical education Students. The instructions were given to the students before filling these questionnaires by the researcher. For the present study, MPI was used for data collection before & after physical education academic program to the students through questionnaires.
Entanglement quantification through local observable correlations
Christian Kothe,Gunnar Bj?rk
Physics , 2006, DOI: 10.1103/PhysRevA.75.012336
Abstract: We present a significantly improved scheme of entanglement detection inspired by local uncertainty relations for a system consisting of two qubits. Developing the underlying idea of local uncertainty relations, namely correlations, we demonstrate that it's possible to define a measure which is invariant under local unitary transformations and which is based only on local measurements. It is quite simple to implement experimentally and it allows entanglement quantification in a certain range for mixed states and exactly for pure states, without first obtaining full knowledge (e.g. through tomography) of the state.
The fungus Neurospora crassa displays telomeric silencing mediated by multiple sirtuins and by methylation of histone H3 lysine 9
Kristina M Smith, Gregory O Kothe, Cindy B Matsen, Tamir K Khlafallah, Keyur K Adhvaryu, Melissa Hemphill, Michael Freitag, Mohammad R Motamedi, Eric U Selker
Epigenetics & Chromatin , 2008, DOI: 10.1186/1756-8935-1-5
Abstract: The selectable marker, hph, was inserted at the subtelomere of Linkage Group VR in an nst-1 (neurospora sir two-1) mutant and was silenced when nst-1 function was restored. We show that NST-1 is an H4-specific histone deacetylase. A second marker, bar, tested at two other subtelomeres, was similarly sensitive to nst-1 function. Mutation of three additional SIR2 homologues, nst-2, nst-3 and nst-5, partially relieved silencing. Two genes showed stronger effects: dim-5, which encodes a histone H3 K9 methyltransferase and hpo, which encodes heterochromatin protein-1. Subtelomeres showed variable, but generally low, levels of DNA methylation. Elimination of DNA methylation caused partial derepression of one telomeric marker. Characterization of histone modifications at subtelomeric regions revealed H3 trimethyl-K9, H3 trimethyl-K27, and H4 trimethyl-K20 enrichment. These modifications were slightly reduced when telomeric silencing was compromised. In contrast, acetylation of histones H3 and H4 increased.We demonstrate the presence of telomeric silencing in Neurospora and show a dependence on histone deacetylases and methylation of histone H3 lysine 9. Our studies also reveal silencing functions for DIM-5 and HP1 that appear independent of their role in de novo DNA methylation.Linear chromosomes pose a problem for replication of the terminal section of the DNA strand with a 5' end. The problem is solved in most eukaryotes by the addition of repeated sequences to the chromosome ends [1]. Thus the budding yeast Saccharomyces cerevisiae sports TG1–3 repeats on the ends of its chromosomes [2], while telomeres of both the filamentous fungus Neurospora crassa and humans comprise TTAGGG repeats [3,4]. Drosophila's chromosome ends are capped by arrays of retrotransposons and the adjacent subtelomeric DNA consists of repetitive elements called telomere-associated sequences (TAS) [4]. TAS appear cytologically condensed (that is, heterochromatic) [5] and confer silencing on nearby g
Assessing the Effect of Disturbances on Ectomycorrhiza Diversity
Virgil Iordache,Felicia Gherghel,Erika Kothe
International Journal of Environmental Research and Public Health , 2009, DOI: 10.3390/ijerph6020414
Abstract: Ectomycorrhiza (ECM) communities can be described on a species level or on a larger scale at an ecosystem level. Here we show that the species level approach of successional processes in ECM communities is not appropriate for understanding the diversity patterns of ECM communities at contaminated sites. An ecosystem based approach improves predictability since different biotic and abiotic factors are included. However, it still does not take into account the hierarchical structure of the ecosystem. We suggest that diversity patterns of ECMs communities in forests can best be investigated at three levels. This hypothetical approach for investigation can be tested at sites of secondary succession in areas contaminated with metals. Once the diversity patterns are appropriately described by a hierarchical ecosystem approach, to the species level is used to explain these patterns by populational and ecotoxicological mechanisms.
Arbitrarily High Super-Resolving Phase Measurements at Telecommunication Wavelengths
Christian Kothe,Gunnar Bj?rk,Mohamed Bourennane
Physics , 2010, DOI: 10.1103/PhysRevA.81.063836
Abstract: We present two experiments that achieve phase super-resolution at telecommunication wavelengths. One of the experiments is realized in the space domain and the other in the time domain. Both experiments show high visibilities and are performed with standard lasers and single-photon detectors. The first experiment uses six-photon coincidences, whereas the latter needs no coincidence measurements, is easy to perform, and achieves, in principle, arbitrarily high phase super-resolution. Here, we demonstrate a 30-fold increase of the resolution. We stress that neither entanglement nor joint detection is needed in these experiments, demonstrating that neither is necessary to achieve phase super-resolution.
A luminosity monitor for the A4 parity violation experiment at MAMI
T. Hammel,P. Achenbach,S. Baunack,L. Capozza,J. Diefenbach,K. Grimm,D. vonHarrach,Y. Imai,E. Kabuss,R. Kothe,J. H. Lee,A. LopesGinja,F. E. Maas,A. SanchezLorente,E. Schilling,G. Stephan,C. Weinrich,I. Altarev
Physics , 2005, DOI: 10.1016/j.nima.2006.03.028
Abstract: A water Cherenkov luminosity monitor system with associated electronics has been developed for the A4 parity violation experiment at MAMI. The detector system measures the luminosity of the hydrogen target hit by the MAMI electron beam and monitors the stability of the liquid hydrogen target. Both is required for the precise study of the count rate asymmetries in the scattering of longitudinally polarized electrons on unpolarized protons. Any helicity correlated fluctuation of the target density leads to false asymmetries. The performance of the luminosity monitor, investigated in about 2000 hours with electron beam, and the results of its application in the A4 experiment are presented.
A high power liquid hydrogen target for the Mainz A4 parity violation experiment
I. Altarev,E. Schilling,S. Baunack,L. Capozza,J. Diefenbach,K. Grimm,Th. Hammel,D. vonHarrach,Y. Imai,E. M. Kabuss,R. Kothe,J. H. Lee,A. LopesGinja,F. E. Maas,A. SanchezLorente,G. Stephan,C. Weinrich
Physics , 2005, DOI: 10.1016/j.nima.2006.03.022
Abstract: We present a new powerful liquid hydrogen target developed for the precise study of parity violating electron scattering on hydrogen and deuterium. This target has been designed to have minimal target density fluctuations under the heat load of a 20$\mu$A CW 854.3 MeV electron beam without rastering the electron beam. The target cell has a wide aperture for scattered electrons and is axially symmetric around the beam axis. The construction is optimized to intensify heat exchange by a transverse turbulent mixing in the hydrogen stream, which is directed along the electron beam. The target is constructed as a closed loop circulating system cooled by a helium refrigerator. It is operated by a tangential mechanical pump with an optional natural convection mode. The cooling system supports up to 250 watts of the beam heating removal. Deeply subcooled liquid hydrogen is used for keeping the in-beam temperature below the boiling point. The target density fluctuations are found to be at the level 10$^{-3}$ at a beam current of 20 $\mu$A.
Plant breeding in the turn of the millennium
Borém, Aluízio;Milach, Sandra Cristina Kothe;
Brazilian Archives of Biology and Technology , 1998, DOI: 10.1590/S1516-89131998000300001
Abstract: the transition from hunting and gathering to farming happened about 10,000 years ago, independently and diffusely in several places in the world. plant breeders were responsible for genetic progress in a number of crop species. it included hybrids, the introgression of wild species genes and also the green revolution, which started in the 1960's with the cereals. the varieties developed by breeding, along with the use of new crop technology (fertilization, soil tillage, etc.) changed the status of some countries from importers to exporters of food. in the turn of the millennium,, plant breeding, faces new challenges in a globalized world, but it has new tools to deal with them. notwithstanding the present contributions of plant breeding and crop management, its future contributions may be even greater. the partnership being developed between plant breeding and biotechnology will assure a more consistent and predictable genetic progress. current contributions of biotechnology have arrived for many crops in different places of the world. varieties developed by transformation are grown in large acreage in some countries. some concerns have also arisen from the use of gmos. for example, the introgression of a gene for insect resistance 4 into many different species could result in an undesirable endemic risk, here called interespecific biotechnological vulnerability. another concern is that biotechnology race may create yield plateaus in programs using genes pyramiding for all new traits made available by biotechnology, resulting in what is called genetic gridlock. nevertheless, the benefits of using biotechnology will substantially enhance the contributions of plant breeding to human life
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