920 research outputs found
Induced Polyakov supergravity on Riemann surfaces of higher genus
An effective action is obtained for the , induced supergravity on a
compact super Riemann surface (without boundary) of genus ,
as the general solution of the corresponding superconformal Ward identity. This
is accomplished by defining a new super integration theory on
which includes a new formulation of the super Stokes theorem and residue
calculus in the superfield formalism. Another crucial ingredient is the notion
of polydromic fields. The resulting action is shown to be well-defined and free
of singularities on \sig. As a by-product, we point out a morphism between
the diffeomorphism symmetry and holomorphic properties.Comment: LPTB 93-10, Latex file 20 page
On the holomorphic factorization for superconformal fields
For a generic value of the central charge, we prove the holomorphic
factorization of partition functions for free superconformal fields which are
defined on a compact Riemann surface without boundary. The partition functions
are viewed as functionals of the Beltrami coefficients and their fermionic
partners which variables parametrize superconformal classes of metrics.Comment: 5 pages, LATEX, MPI-Ph/92-7
The Polyakov action on the supertorus
A consistent method for obtaining a well-defined Polyakov action on the
supertorus is presented. This method uses the covariantization of derivative
operators and enables us to construct a Polyakov action which is globally
defined.Comment: 15 pages LaTe
d=2, N=2 Superconformal Symmetries and Models
We discuss the following aspects of two-dimensional N=2 supersymmetric
theories defined on compact super Riemann surfaces: parametrization of (2,0)
and (2,2) superconformal structures in terms of Beltrami coefficients and
formulation of superconformal models on such surfaces (invariant actions,
anomalies and compensating actions, Ward identities).Comment: 43 pages, late
Response of Broiler Chickens in the Starter and Finisher Phases to 3 Sources of Microbial Phytase
A broiler chicken study was conducted for 42 D to evaluate their responses to 3 commercially available microbial phytases. Growth performance, nutrient digestibility, and bone mineralization at days 21 and 42 posthatching were used as parameters of evaluation. The study was a randomized complete block design with 12 treatments, 8 replicate pens, and 25 birds per pen. Treatments included a positive control (PC), a negative control (NC) with crude protein (CP), nonphytate phosphorus (P), and calcium (Ca) reduced by 18, 1.5, and 1.8 g/kg, respectively; the NC + 4 levels of phytase A (250, 500, 750, 1,000 FTU/kg), 3 levels of phytase B (250, 500, 750 FTU/kg), and 3 levels of phytase C (500, 750, 1,000 FTU/kg). Broilers fed the NC diet had reduced (P \u3c 0.05) performance and digestibility measures at days 21 and 42 relative to the PC. All phytase enzymes improved (P \u3c 0.05) BW, gain, feed efficiency, and tibia ash weight and percent. Inclusion of phytase at the highest levels improved (P \u3c 0.05) tibia ash weight by an average of 18.5 and 22% at days 21 and 42, respectively, over the NC. Phytase A linearly improved (P \u3c 0.05) the apparent ileal digestibility (AID) of DM, Ca, P, copper, and sodium at day 21, and the AID of energy, nitrogen, and all amino acid (AA) digestibility at day 42 posthatching. Phytase B linearly (P \u3c 0.05) improved BW gain and feed efficiency of birds at day 21 and quadratically improved (P \u3c 0.05) the AID of nitrogen and all AA in birds at day 42. Supplementation of birds fed the NC with phytase C linearly improved (P \u3c 0.05) the BW gain, feed intake, feed efficiency, and AID of DM, energy, nitrogen, all AA, and all minerals except manganese at day 42. In conclusion, all 3 phytase products improved the growth performance, nutrient and mineral digestibility, and bone mineralization of birds fed diets deficient in nitrogen, Ca, and P similar to or more than birds fed diet adequate in P and CP
W-algebras from symplectomorphisms
It is shown how -algebras emerge from very peculiar canonical
transformations with respect to the canonical symplectic structure on a compact
Riemann surface. The action of smooth diffeomorphisms of the cotangent bundle
on suitable generating functions is written in the BRS framework while a
-symmetry is exhibited. Subsequently, the complex structure of the symmetry
spaces is studied and the related BRS properties are discussed. The specific
example of the so-called -algebra is treated in relation to some other
different approaches.Comment: LaTex, 25 pages, no figures, to appear in Journ. Math. Phy
Supersymmetric structure of the induced W gravities
We derive the supersymmetric structure present in W-gravities which has been
already observed in various contexts as Yang-Mills theory, topological field
theories, bosonic string and chiral W_{3}-gravity. This derivation which is
made in the geometrical framework of Zucchini, necessitates the introduction of
an appropriate new basis of variables which replace the canonical fields and
their derivatives. This construction is used, in the W_{2}-case, to deduce from
the Chern-Simons action the Wess-Zumino-Polyakov action.Comment: 17 pages, Latex. To appear in Class. Quantum. Gravit
PROBIÓTICOS NA ALIMENTAÇÃO DE LEITÕES DO DESMAME AOS 63 DIAS DE IDADE
O objetivo do experimento foi avaliar o desempenho de leitões recebendo
antibiótico ou probiótico, em uso isolado ou associado. O projeto foi conduzido na granja de
suínos da UFPR, em Pinhais - Pr. Foram utilizados 112 leitões mestiços Landrace x Large
White, distribuídos num delineamento experimental em blocos casualizados com sete
repetições por tratamento. O probiótico testado continha 5 x 10 esporos viáveis de Bacillus
toyoi por grama. As rações continham 3.350 Kcal/EM/Kg; 21,8 e 20% de proteína bruta e 0,2
e 0,1% de inclusão do probiótico nas rações pré-inicial e inicial, respectivamente. Os
tratamentos utilizados foram: T1 - ração à base de soja e milho (basal); T2 - basal +
probiótico; T3 - basal + antibiótico e T4 - basal + antibiótico + probiótico. Foram avaliados os
pesos ao desmame, 37, 51 e 63 dias; consumo de ração (CR); ganho de peso diário (GPD)
e conversão alimentar (CA) nos tratamentos e suas interações fatoriais foram analisados
pelo SAEG e as médias comparadas por Newman Keuls, a 5%. Os pesos aos 51 e 63 dias e
o GPD foram superiores para T3 e T4. A CA foi superior em T4. A adição ou não de
probiótico não apresentou melhora para nenhuma das variáveis. A presença de antibiótico
apresentou melhores pesos aos 51 e 63 dias, GPD, CR e CA. O uso de probióticos piorou
as características de desempenho dos leitões quando comparado ao antibiótico; o probiótico
associado ao antibiótico melhorou a eficiência alimentar.
Probiotcs in the pigs food from weaning to 63 days
Abstract
The main aim of the present experiment was to carry on an evaluation of the
performance of pigs using antibiotic or probiotic either isolated or in association. The experiment
took place at the UFPR pig farm , Pinhais, Pr. A total of 112 crossbreed Landrace x Large White
pigs were used in the experiment. The animals were distributed in casual blocks according to the
experimental outline with seven repetitions for each treatment. The tested probiotic contained 5
x10 viable spores of Bacillus toyoi per gram. The rations contained 3,350 Kcal/EM/kg; 21.8,
20% of raw protein and 0.2 and 0.1 % of inclusion of the probiotic in the preinitial and initial
rations, respectively.The treatments were as follows: T1 of soy and corn (basal) ; T2 - basal +
probiotic; T3 - basal + antibiotic ; T4 - basal + probiotic + antibiotic. At each treatment and its
factorial interactions the following parameters were then considered: weight at the weaning and
at 37, 51 and 63 days of age; rations consumption (CR); daily wining of weight (GPD); and
alimentary conversion (CA). The data obtained were then analyzed by SAEG and the averages
compared by Newman Keuls, at 5%. The weights at 51 and 63 days and the GPD were
superiors for T3 and T4. Alimentary conversion - CA - showed to be superior for T4. The
addition or not of probiotic did not show weight improvement for none of the variables. Pig
weights at 51 and 63 days, GPD, CR and CA values were positively influenced by the addition of
antibiotic to the ration. Compared to the antibiotic, the use of probiotic worsened the pigs
performance characteristics, however, the association of probiotic and antibiotic improved the
alimentary efficiency
Chronic pneumonia with Pseudomonas aeruginosa and impaired alveolar fluid clearance
BACKGROUND: While the functional consequences of acute pulmonary infections are widely documented, few studies focused on chronic pneumonia. We evaluated the consequences of chronic Pseudomonas lung infection on alveolar function. METHODS: P. aeruginosa, included in agar beads, was instilled intratracheally in Sprague Dawley rats. Analysis was performed from day 2 to 21, a control group received only sterile agar beads. Alveolar-capillary barrier permeability, lung liquid clearance (LLC) and distal alveolar fluid clearance (DAFC) were measured using a vascular ((131)I-Albumin) and an alveolar tracer ((125)I-Albumin). RESULTS: The increase in permeability and LLC peaked on the second day, to return to baseline on the fifth. DAFC increased independently of TNF-α or endogenous catecholamine production. Despite the persistence of the pathogen within the alveoli, DAFC returned to baseline on the 5(th )day. Stimulation with terbutaline failed to increase DAFC. Eradication of the pathogen with ceftazidime did not restore DAFC response. CONCLUSIONS: From these results, we observe an adequate initial alveolar response to increased permeability with an increase of DAFC. However, DAFC increase does not persist after the 5(th )day and remains unresponsive to stimulation. This impairment of DAFC may partly explain the higher susceptibility of chronically infected patients to subsequent lung injury
- …