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Search Results: 1 - 10 of 190204 matches for " G. Forster "
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Tumores em certos híbridos do gênero nicotiana
Brieger, F. G.;Forster, R.;
Bragantia , 1942, DOI: 10.1590/S0006-87051942000700002
Abstract: the present paper gives some observations on the tumour formation and other abnormalities observed in the interspecific hybrids, nicotiana glauca x n. langsdorffii and n. glauca x n. sanderae. without entering into a detailed discussion of the literature and the various speculations proposed by kostoff and whitaker about the causes of tumour formations or on the relations between "spontaneous" and pathogenic tumours (kostoff, levine and others), two new observations are described. 1) the abnormalities in the two above mentioned hybrids are quite different. as already reported by other authors, the hybrids n. glauca x n. langsdorffii are initially quite normal and vigorous, while tumours and other proliferations, on the stem, the stem base and the root appear more or less frequently in older plants. tumours on leaf are rare and flowers are normal (fig. 1,2,7 and 10). the hybrids n. glauca x n. sanderae are very different from the former. these remain either weak and rachitic, forming early large tumours at the stem base and on the root (fig. 5 and 6 right half). numerous shoots with more or less normal leaves may arise from these tumours (fig. 11 and 12). or the plants show an extremely vigorous and abnormal ramification with a number of serial axial shoots developing in each leaf axis (fig. 3 and 4). the leaves are frequently deformed and the flowers exhibit abnormally coloured patches. when crossing n. glauca with f1 (n. langsdorffii x n. sanderae) the offspring could clearly be divided into two groups : plants exactly as described for n. glauca x n. langsdorffii and others which correspond to the types of n. glauca x n. sanderae. thus it seems that we are dealing with a monogenic differences, each species, n. langsdorffii and n. sanderae, being homozygous for one allele each. these alleles have no phenotypic effect in either pure species, but only in hybrids when combined with the genom of n. glauca. the situation is somewhat similar to the sublethal genes reporte
Projeto e constru??o de uma barragem de terra
Barreto, G. B.;Forster, R.;
Bragantia , 1958, DOI: 10.1590/S0006-87051958000100008
Abstract: the purpose of this paper is to present a detailed project that may be helpful to others undertaking the building of an earth dam. results obtained in an impermeable earth dam are presented; the impermeability was attained by sodium hydroxide treatment of its central core; the effect on the impermeability of the dam was determined from undisturbed samples collected during and after the construction period. the position reached by the saturation line in the external slope was determined in order to evaluate the effect of the treatment on the impermeability of the dam.
Estudo da bacia hidrográfica da barragem "Monjolinho"
Barreto, G. B.;Forster, R.;Bertoni, J.;
Bragantia , 1962, DOI: 10.1590/S0006-87051962000100043
Abstract: in this paper the authors present the study of the "monjolinho" earth dam watershed with particular reference of its silting problem. the physical characteristics of the watershed, based on a plane - altimetric survey, are presented. a description of the soil type, vegetative cover, as well as of the changes that took place in the reservoir flood and in the upstream side slope after 7 years of use is given.
NGC7538S - a High-Mass Protostar with a Massive Rotating Disk
G. Sandell,M. Wright,J. R. Forster
Physics , 2003, DOI: 10.1086/376612
Abstract: We report the detection of a massive rotating disk around the high-mass Class 0 candidate NGC 7538S. The disk is well-resolved with BIMA (HPBW =3.7") in 3.4 mm continuum and in H13CN J = 1 - 0. It is seen nearly edge on and has a size of ~ 30,000 AU. A young, powerful outflow perpendicular to the rotating disk is mapped in SiO J = 2 - 1 and HCO+ J = 1 - 0. The dynamical age of the outflow is < 10,000 yr. The velocity gradient seen in H13CN is consistent with Keplerian rotation. Assuming that the gas is gravitationally bound, the mass of the central object is ~ 40 Msun. The mass of the continuum ``disk'' is <= 100 Msun and has a luminosity of 10^4 Lsun. H13CN gives a mass ~ 400 Msun for the rotating disk, and ~ 1000 Msun for the extended (20") envelope. Our observations confirm that this is an extremely massive protostar in its earliest stages.
Mindfulness and the Quality of Romantic Relationships: Is It All about Well-Being?  [PDF]
Peter M. Forster
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.55005
Abstract: Studies have shown that mindfulness is positively associated with a number of individual factors related to well-being, attention and awareness, and life satisfaction. Mindfulness has also been shown to be positively associated with the perceived quality of romantic relationships. However, the factors underlying the connection between mindfulness and relationship quality are not well understood. A study is reported in which the connection between mindfulness and perceived relationship quality was investigated when individual life satisfaction was controlled for. The results suggest that individual life satisfaction partially mediates the association between mindfulness and relationship quality but that other factors also contribute to that association. Possible additional mediating factors and ideas for possible future studies that could throw light on this connection are discussed.
Comportamento de variedades e progênies de fumo na resistência ao "vira-cabe?a"
Brieger, F. G.;Lima, A. Rodrigues;Forster, R.;
Bragantia , 1942, DOI: 10.1590/S0006-87051942000800001
Abstract: 1) the object of the experiment presented in this publication was a detailed comparison between progenies of the varieties virginia and sumatra of the collection of the instituto agron?mico de campinas. we intended to decide whether these strains were sufficiently heterogeneous to permit further selections or whether they were already so uniform as to allow a reduction in their number within our collection. 2) a preliminary experiment in 1939/40 showed clearly that some of the 7 types introduced as sumatra were less resistant than others, and the experiment was thus continued "with only four of them. 3) the lay-out of the final experiment was such as to permit both a complete analysis of soil heterogeneity and of differences between the genetically different lines. without confounding there were only 3 complete replications, but after confounding we may dispose of 8 degrees of freedom for replications. this method of decomposing the total variation was used in the analysis of the vegetative characters. 4) the analysis of disease resistance could follow the same lines only the case of the infection of sumatra by "spotted wilt" (2). there the main percentage of infected plants per plot was 60%, and the individual percentagens, without any further angular or other transformation, were used. in all other cases the number either of diseased or of not disease plants per plot was so small that these freguencies could only be compared with the corresponding poisson distribuition. for this propose either a x2 test was carried out or a comparison was only made between the error of a poisson distribuition and the error directly determined from the data. 5) the blocks were reasonably homogeneous, soil heterogeneity causing only minor variation. 6) the plant characters such as height of plant, number of leaves and their dimensions showed a variation which was statistically significant, but without any practical importance as the data on pg. 280 show. the mean height was found to
Technical note: The Lagrangian particle dispersion model FLEXPART version 6.2
A. Stohl, C. Forster, A. Frank, P. Seibert,G. Wotawa
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2005,
Abstract: The Lagrangian particle dispersion model FLEXPART was originally (about 8 years ago) designed for calculating the long-range and mesoscale dispersion of air pollutants from point sources, such as after an accident in a nuclear power plant. In the meantime FLEXPART has evolved into a comprehensive tool for atmospheric transport modeling and analysis. Its application fields were extended from air pollution studies to other topics where atmospheric transport plays a role (e.g., exchange between the stratosphere and troposphere, or the global water cycle). It has evolved into a true community model that is now being used by at least 25 groups from 14 different countries and is seeing both operational and research applications. A user manual has been kept actual over the years and was distributed over an internet page along with the model's source code. In this note we provide a citeable technical description of FLEXPART's latest version (6.2).
Entwicklung eines Fragebogens zur Erfassung von Kompetenzen in der Medizin: Ergebnisse zur Reliabilit t und Validit t [Development of a questionnaire to assess medical competencies: Reliability and validity of the Questionnaire]
Giesler, Marianne,Forster, Johannes,Biller, Silke,Fabry, G?tz
GMS Zeitschrift für Medizinische Ausbildung , 2011, DOI: 10.3205/zma000743
Abstract: [english] Introduction: While preparing a graduate survey for medical education in 2008 we realized that no instrument existed that would be suitable to evaluate whether the learning outcomes outlined in the Medical Licensure Act ( AppO) would be met. Therefore we developed the (Freiburger Fragebogen zur Erfassung von Kompetenzen in der Medizin, FKM) which has been revised and extended several times since then.Currently the FKM includes 45 items which are assigned to nine domains that correspond to the CanMEDS roles: medical expertise, communication, team-work, health and prevention, management, professionalism, learning, scholarship, and personal competencies.Methods: In order to test the reliability and validity of the questionnaire we have repeatedly surveyed medical students and residents since May 2008. In this article we report on the results of a cross-sectional study with 698 medical students from the preclinical and clinical years. In addition, we report the results of a survey of 514 residents who were up to two years into their residency.Results and conclusions: In summary, results show that the scales of the FKM are reliable (Cronbach’s α between .68 and .97). Significant differences in means between selected groups of students support the measure’s construct validity. Furthermore, there is evidence that the FKM might be used as a screening tool e.g. in graduate surveys to identify weaknesses in the medical education curriculum. [german] Einführung: Bei der Vorbereitung einer Absolventenbefragung im Fach Humanmedizin wurde deutlich, dass ein Verfahren fehlte, mit dem erfasst werden kann, ob die in der AppO aufgeführten Lehr- und Lernziele erreicht werden. Aus diesem Grund wurde der von einer Arbeitsgruppe an der Medizinischen Fakult t der Universit t Freiburg entwickelt. Der FKM wurde seitdem mehrmals überarbeitet und erweitert. Er umfasst derzeit 45 Items, die neun Kompetenzbereichen zugeordnet werden. Diese Kompetenzbereiche stimmen im Wesentlichen mit den CanMEDS-Rollen überein. Methode: Um die Reliabilit t und Validit t des Fragebogens zu überprüfen, wurden seit Mai 2008 mehrfach Studierende und Assistenz rzte befragt. In dem vorliegenden Beitrag werden die Ergebnisse einer Querschnittsstudie berichtet, in der 698 Studierende des ersten und zweiten Studienabschnitts den FKM beantwortet haben. Des Weiteren werden die Ergebnisse von 514 Assistenz rzten mit bis zu zwei Jahren Berufserfahrung beschrieben, die den FKM im Rahmen einer Absolventenbefragung ausgefüllt haben.Ergebnisse und Schlussfolgerungen: Die bisherigen Ergebnisse zeigen, da
Medizinische Ausbildung und der Bologna-Prozess [Medical Education and the Bologna-Process]
Gerke, Wolfgang,Breipohl, Winrich,Forster, Johannes,Hahn, Eckhart G.
GMS Zeitschrift für Medizinische Ausbildung , 2006,
Abstract:
Perturbed phase-space dynamics of hard-disk fluids
Christina Forster,Robin Hirschl,Harald A. Posch,William G. Hoover
Physics , 2002,
Abstract: The Lyapunov spectrum describes the exponential growth, or decay, of infinitesimal phase-space perturbations. The perturbation associated with the maximum Lyapunov exponent is strongly localized in space, and only a small fraction of all particles contributes to the perturbation growth at any instant of time. This fraction converges to zero in the thermodynamic large-particle-number limit. For hard-disk and hard-sphere systems the perturbations belonging to the small positive and large negative exponents are coherently spread out and form orthogonal periodic structures in space, the ``Lyapunov modes''. There are two types of mode polarizations, transverse and longitudinal. The transverse modes do not propagate, but the longitudinal modes do with a speed about one third of the sound speed. We characterize the symmetry and the degeneracy of the modes. In the thermodynamic limit the Lyapunov spectrum has a diverging slope near the intersection with the abscissa. No positive lower bound exists for the positive exponents. The mode amplitude scales with the inverse square root of the particle number as expected from the normalization of the perturbation vectors.
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