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Search Results: 1 - 10 of 224085 matches for " Laerte R;Rohr "
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Desempenho agron?mico de clones elite de batata
Silva, Giovani O da;Castro, Caroline M;Terres, Laerte R;Rohr, Angela;Suinaga, Fábio A;Pereira, Arione da S;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000300034
Abstract: the aim of this work was to verify the growth cycle, yield components and specific gravity of advanced potato clones as compared to the main varieties grown in brazil. the experiment was carried on at the embrapa clima temperado experimental field, in pelotas, rio grande do sul state, brazil. eight advanced potato clones developed by the embrapa potato breeding program, and two commercial cultivars were evaluated in the autumn season of 2011. a randomized complete block design with four replications was used, the plots being constituted by a line of 20 plants. growth cycle was assessed 95 days after planting. plants of each plot were harvested at 110 days, followed by evaluation of yield components and specific gravity. after checking for normality of error distribution, the data were submitted to analysis of variance and to means grouping by the scott & knott test. cl02-05, cl69-05, cl27-05 and 2197-15 clones showed higher commercial tuber number, percentage of commercial tubers and average tuber weight than the check varieties. cl02-05 clone showed, besides, the highest yield potential of commercial tubers of all four clones. cl69-05 and 2197-15 presented specific gravity and growth cycle similar to asterix, but had higher yield potential and larger tuber size than it.
Full Configuration Interaction wave function as a formal solution to the Optimized Effective Potential and Kohn-Sham models in finite basis sets
Daniel R. Rohr,Andreas Savin
Physics , 2009, DOI: 10.1016/j.theochem.2009.10.037
Abstract: Using finite basis sets, it is shown how to construct a local Hamiltonian, such that one of its infinitely many degenerate eigenfunctions is the ground state full configuration interaction (FCI) wave function in that basis set. Formally, the local potential of this Hamiltonian is the optimized effective potential and the exact Kohn-Sham potential at the same time, because the FCI wave function yields the exact ground-state density and energy. It is not the aim of this paper to provide a new algorithm for obtaining FCI wave functions. A new potential is the goal.
Combining Density Functional Theory and Density Matrix Functional Theory
Daniel R. Rohr,Julien Toulouse,Katarzyna Pernal
Physics , 2010, DOI: 10.1103/PhysRevA.82.052502
Abstract: We combine density-functional theory with density-matrix functional theory to get the best of both worlds. This is achieved by range separation of the electronic interaction which permits to rigorously combine a short-range density functional with a long-range density-matrix functional. The short-range density functional is approximated by the short-range version of the Perdew-Burke-Ernzerhof functional (srPBE). The long-range density-matrix functional is approximated by the long-range version of the Buijse-Baerends functional (lrBB). The obtained srPBE+lrBB method accurately describes both static and dynamic electron correlation at a computational cost similar to that of standard density-functional approximations. This is shown for the dissociation curves of the H$_{2}$, LiH, BH and HF molecules.
Silurian Bivalvia from Chichagof Island, Southeast Alaska (Alexander terrane)
K?í? J,Blodgett R B,Rohr D M
Bulletin of Geosciences , 2011, DOI: 10.3140/bull.geosci.1277
Abstract: The new Silurian Bivalvia Goniophora thula-Mytilarca boucoti Community from a new locality east of the Hoonah Airport on Chichagof Island, Southeast Alaska, U.S.A. is composed of 9 species [?Colpomya aff. hugini Liljedahl, 1994 and ?Colpomya aff. audae Liljedahl, 1994 (Colpomyidae); Modiolopsis aff. modiolaris Conrad, 1838 (Modiolopsidae); Mytilarca boucoti sp. nov. (Ambonychiidae); ?Schizodus sp. A and ?Schizodus sp. B (Schizodidae); Sanguinolites sp. (Sanguinolitidae); ?Modiomorpha sp. and Goniophora thula sp. nov. (Modiomorphinae)]. In this paper two new species are described. The Goniophora thula-Mytilarca boucoti Community most probably occupied a gently inclined upper slope environment lying seaward of a cyanobacterial reef front which marked the outer edge of a late Silurian carbonate platform (represented by the Kennel Creek Limestone). The fauna of this locality consists of a rich benthos, especially rich in brachiopods, but secondarily dominated by bivalves and gastropods. Cephalopods are rare, favositid tabulate corals are also present, but form only a very minor component. The new community is most closely related to the homologous and analogous late Wenlock Bivalvia community described from Gotland, Sweden, Baltica. Similar biotic ties are with the shallow water early Ludlow Janicula potens Community from the Prague Basin, Bohemia, Perunica. Cosmopolitanism is characteristic for the Silurian Bivalvia genera, which were dispersed in most regions of the world due to their relatively long pelagic larval life and relatively small distances between the basins, islands and continents in the Silurian. For the distribution of Bivalvia during the Silurian were more limiting physical factors like temperature, salinity, substrate, food, oxygen content, light, and depth. The fauna described here is from the Alexander terrane, an accreted terrane which appears to represent a rifted block of the eastern Siberian palaeocontinent. The latter interpretation is based on faunal affinities, notably brachiopods, but suggested by other groups such as gastropods and sponges, as well as on the basis of similarities in sedimentary succession.
Do Parasitic Trematode Cercariae Demonstrate a Preference for Susceptible Host Species?
Brittany F. Sears, Andrea D. Schlunk, Jason R. Rohr
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0051012
Abstract: Many parasites are motile and exhibit behavioural preferences for certain host species. Because hosts can vary in their susceptibility to infections, parasites might benefit from preferentially detecting and infecting the most susceptible host, but this mechanistic hypothesis for host-choice has rarely been tested. We evaluated whether cercariae (larval trematode parasites) prefer the most susceptible host species by simultaneously presenting cercariae with four species of tadpole hosts. Cercariae consistently preferred hosts in the following order: Anaxyrus ( = Bufo) terrestris (southern toad), Hyla squirella (squirrel tree frog), Lithobates ( = Rana) sphenocephala (southern leopard frog), and Osteopilus septentrionalis (Cuban tree frog). These host species varied in susceptibility to cercariae in an order similar to their attractiveness with a correlation that approached significance. Host attractiveness to parasites also varied consistently and significantly among individuals within a host species. If heritable, this individual-level host variation would represent the raw material upon which selection could act, which could promote a Red Queen “arms race” between host cues and parasite detection of those cues. If, in general, motile parasites prefer to infect the most susceptible host species, this phenomenon could explain aggregated distributions of parasites among hosts and contribute to parasite transmission rates and the evolution of virulence. Parasite preferences for hosts belie the common assumption of disease models that parasites seek and infect hosts at random.
Strophatrypa, a new genus of Brachiopoda (Atrypidae), from upper Silurian strata of the Alexander terrane, northeast Chichagof Island, Alaska
Boucot A J,Blodgett R B,Rohr D M
Bulletin of Geosciences , 2012, DOI: 10.3140/bull.geosci.1285
Abstract: The atrypid brachiopod Strophatrypa skaflestadi gen. et sp. nov. occurs in unnamed upper Silurian strata exposed near the town of Hoonah on northeast Chichagof Island, Southeast Alaska. The new genus represents the first strophic atrypoid with many characters otherwise similar to those of the Atrypidae. Although this genus is known from only a single bed at one Alaskan locality, its unique morphology is worth noting in anticipation that similar forms may be discovered elsewhere in the Alexander terrane, or especially somewhere in Siberia where other taxa restricted to the Silurian of the Alexander terrane are shared. This paper represents a further contribution to our limited knowledge of the Silurian brachiopods of the Alexander terrane of Southeast Alaska.
Correlation potentials for molecular bond dissociation within the self-consistent random phase approximation
M. Hellgren,D. R. Rohr,E. K. U. Gross
Physics , 2011, DOI: 10.1063/1.3676174
Abstract: Self-consistent correlation potentials for H$_2$ and LiH for various inter-atomic separations are obtained within the random phase approximation (RPA) of density functional theory. The RPA correlation potential shows a peak at the bond midpoint, which is an exact feature of the true correlation potential, but lacks another exact feature: the step important to preserve integer charge on the atomic fragments in the dissociation limit. An analysis of the RPA energy functional in terms of fractional charge is given which confirms these observations. We find that the RPA misses the derivative discontinuity at odd integer particle numbers but explicitly eliminates the fractional spin error in the exact-exchange functional. The latter finding explains the accurate total energy in the dissociation limit.
The emergence of superconductivity in BaNi2(Ge1-xPx)2 at a structural instability
Daigorou Hirai,F. von Rohr,R. J. Cava
Physics , 2012, DOI: 10.1103/PhysRevB.86.100505
Abstract: The physical properties and structural evolution of the 122-type solid solution BaNi2(Ge1-xPx)2 are reported. The in-plane X-X (X = Ge1-xPx) dimer formation present in the end member BaNi2Ge2, which results in a structural transition to orthorhombic symmetry, is completely suppressed to zero temperature on P substitution near x = 0.7, and a dome-shape superconducting phase with a maximum Tc = 2.9 K emerges. Clear indications of phonon softening and enhanced electron-phonon coupling are observed at the composition of the structural instability. Our findings show that dimer breaking offers new possibilities as a tuning parameter of superconductivity.
stradiol-Plasmaspiegel in postmenopausalen Frauen und ihre Bedeutung für die Therapie
Rohr UD
Journal für Menopause , 2000,
Abstract: In der Pubert t sind bei Jungen und M dchen mit dem Einsetzen der Hormonproduktion in den Geschlechtsorganen zirkadiane Hormonrhythmen im Blutplasma nachzuweisen. In beiden Geschlechtern, obwohl je nach Geschlecht in ihren Maximalwerten unterschiedlich, erreicht 17-Beta- stradiol (E2) einen Spitzenwert am Nachmittag, w hrend in der Nacht E2 erniedrigt und relativ konstant ist. Zirkadiane Hormonrhythmen bleiben bei der Frau bis zur Pr menopause bestehen und sind in der Postmenopause nicht mehr nachzuweisen. Als Erg nzung zu den bekannten Vorteilen der transdermalen Applikation von 17-Beta- stradiol (Umgehung der Leberpassage, Reduktion der Dosis, Verbesserung der Compliance) wird aufgezeigt, da natürliche zirkadiane Hormonrhythmen mit neuen Matrixpflastern wieder so eingestellt werden, wie sie in der Pr menopause zu sehen sind. Mit den neuen Matrixpflastern lassen sich zum mechanistischen Verst ndnis von zirkadianen E2-Plasmarhythmen sowie ihrer physiologischen Bedeutung systematische Untersuchungen durchführen. Zirkadiane E2-Plasmarhythmen erlauben physiologisch generell eine bessere Anpassung an u ere Bedingungen des Menschen und korrelieren im speziellen mit Symptomen, die mit der Menopause unbehandelter postmenopausaler Frauen in Verbindung gebracht werden. Als Folge k nnen diese Symptome, wie z. B. Hitzewallungen, gest rtes Schlafverhalten und Bluthochdruck, besser unterdrückt werden. Nicht-zirkadiane E2-Rhythmen kommen beim Menschen nur bei extremen Stre situationen vor, und es braucht Tage, bis sich diese Rhythmen nach Belastung wieder einstellen.
De cuando la razón entra en conflicto con la sensorialidad física Los roles femenino y masculino en el marco de la investigación antropológica
Elisabeth Rohr
Espiral , 1997,
Abstract:
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