Estudio de la pausa espiratoria en pacientes con enfermedades obstructivas en proceso de desconexión de la ventilación mecánica

In this work, the flow signal Expiratory Pause (EP) temporal analysis is used in 18 patients with obstructive lung diseases going through spontaneous breathing trial at weaning process. The main objective was to identify the patients who were successfully disconnected (success group: 9 patients), and those who were not (failure and reintubated group: 9 patients). A variable selection stage was done by mean group comparison and step wise variable inclusion, leading to a 3 parameters set: EP time median; cycle time mean; and median absolute deviation of the EP maxima local number. Next, this set was used in a classifier based on linear discriminant analysis, which results in 17 patients (94.4%) correctly classified, with 88.9% of specificity (Sp) and 100% of sensitivity (Se). Finally, applying the leave-one-out cross validation method, results were 88.9% of correctly classified patients (Sp=77.8% and Se=100%). In conclusion, the proposed parameters showed a good performance and could be used to help therapists to wean patients with obstructive diseases.Postprint (published version

Resposta da figueira (Ficus carica L.) ao uso da irrigação e nitrogênio na região de Ilha Solteira

The study had the purpose of evaluating the effects of irrigation and nitrogen fertilization levels upon fig-tree orchards (harvest 1991/1992). A randomized split-plot block design was installed with six irrigation levels (0, 25, 50, 75,100 and 125% of Class A Pan Evaporation) and six nitrogen levels (0, 150, 300, 450, 600 and 750 g/plant), with four repetitions. According to the statistical analysis, significant effects of water supply were verified on ripe fruit harvest, total productivity, branch lenght and ripe fruit heigth and diameter. Nitrogen fertilization effects on ripe fruit harvest and branch lenght were also detected.Com o objetivo de avaliar a resposta da cultura da figueira (safra 91/92) à aplicação de lâminas de irrigação e adubação nitrogenada realizou-se um experimento com seis lâminas de irrigação (O, 25, 50, 75,100 e 125% da evaporação do Tanque Classe A) e seis níveis de nitrogênio (0,150,300,450,600 e 750 g/planta), instalado de acordo com um delineamento de blocos casualizados, em um esquema de parcelas sub-divididas, com quatro repetições. Com base na análise estatística realizada, verificou-se efeito significativo da irrigação sobre a produtividade de frutos maduros, produtividade total, comprimento de ramos e altura e diâmetro de frutos maduros. A adubação nitrogenada mostrou efeito significativo sobre a produtividade de frutos maduros e comprimento de ramos

Zero Modes and the Atiyah-Singer Index in Noncommutative Instantons

We study the bosonic and fermionic zero modes in noncommutative instanton backgrounds based on the ADHM construction. In k instanton background in U(N) gauge theory, we show how to explicitly construct 4Nk (2Nk) bosonic (fermionic) zero modes in the adjoint representation and 2k (k) bosonic (fermionic) zero modes in the fundamental representation from the ADHM construction. The number of fermionic zero modes is also shown to be exactly equal to the Atiyah-Singer index of the Dirac operator in the noncommutative instanton background. We point out that (super)conformal zero modes in non-BPS instantons are affected by the noncommutativity. The role of Lorentz symmetry breaking by the noncommutativity is also briefly discussed to figure out the structure of U(1) instantons.Comment: v3: 24 pages, Latex, corrected typos, references added, to appear in Phys. Rev.

Testing spatial noncommutativiy via the Aharonov-Bohm effect

The possibility of detecting noncommutative space relics is analyzed using the Aharonov-Bohm effect. We show that, if space is noncommutative, the holonomy receives non-trivial kinematical corrections that will produce a diffraction pattern even when the magnetic flux is quantized. The scattering problem is also formulated, and the differential cross section is calculated. Our results can be extrapolated to high energy physics and the bound $\theta \sim [ 10 {TeV}]^{-2}$ is found. If this bound holds, then noncommutative effects could be explored in scattering experiments measuring differential cross sections for small angles. The bound state Aharonov- Bohm effect is also discussed.Comment: 16 pp, Revtex 4, 2 fig, new references added. To appear in PR

Propagators in Noncommutative Instantons

We explicitly construct Green functions for a field in an arbitrary representation of gauge group propagating in noncommutative instanton backgrounds based on the ADHM construction. The propagators for spinor and vector fields can be constructed in terms of those for the scalar field in noncommutative instanton background. We show that the propagators in the adjoint representation are deformed by noncommutativity while those in the fundamental representation have exactly the same form as the commutative case.Comment: 28 pages, Latex, v2: A few typos correcte

Controle das parasitoses gastrintestinais em ovinos e caprinos na região semiárida do Nordeste do Brasil

Neste artigo são revisados alguns conceitos importantes a serem considerados para o controle de parasitas gastrintestinais em caprinos e ovinos. Descrevem-se as características epidemiológicas desta parasitose no semiárido e o aparecimento de resistência aos anti-helmínticos na região. São propostas alternativas para o controle da doença levando em consideração, principalmente, a adoção de técnicas de controle integrado de parasitas com uma mudança nos sistemas de tratamento preventivo para sistemas que permitam a sobrevivência de parasitas susceptíveis na refugia. São discutidas as diferenças entre caprinos e ovinos, considerando que os caprinos são mais susceptíveis e que para maioria das drogas devem ser tratados com doses maiores

Studies on the mineral nutrition of the rice plant: IX. time course on the uptake of macronutrients by the variety IAC-47

Rice plants, variety IAC-47, were grown in the nº 2 nutrient solution of HOAGLAND & ARNON (1950) until the end of the life cycle. Plants were sampled at well defined physiological periods for analyses. It was verified that trends for levvelling off occurred in the case of accumulation of N, K and Ca. Translocation from leaves to grain was observed with respect to N, P and K. Maximum rates of uptake of all elements took place from 50 to 100 days after germination.Foram estudadas, em condições controladas, a acumulação de matéria seca e a de macronutrientes na variedade de arroz IAC-47. Ambos os processos em geral são descritos por sigmóides típicas; picos para os valores totais de produção de matéria seca e de acumulação de elementos entre: 100 e 140 dias depois da germinação