Crescimento e produção da cultura de batata primor na região Oeste. I) Análise comparativa do crescimento e produção em três densidades de população

Parte Iinfo:eu-repo/semantics/publishedVersio

Crescimento e produção da cultura de batata primor na região do Oeste. II) Validação de campo do modelo POTATO.2

Parte IIinfo:eu-repo/semantics/publishedVersio

Estimation de la surface foliaire principale et secondaire d’un sarment de vigne

Dans ce travail on présente des modèles empiriques pour estimer, de façon directe et non destructive, la surface foliaire principale et secondaire d’un sarment de vigne pour quatre cépages portugaises. La surface d’une feuille a été estimée avec un modèle basé sur la forte corrélation entre la somme des longueurs des deux premières nervures latérales et la surface foliaire. Pour l’estimative de la surface foliaire principale d’un sarment on a développé un modèle a partir d’une régression multiple de quatre variables explicatives: longueur du sarment, nombre de feuilles principales et surface foliaire de la feuille majeure et mineure. Pour la surface foliaire secondaire on propose un modèle similaire mais en considérant chaque entrecoeur comme une feuille composé. Ce modèle utilise comme variables explicatives le nombre de feuilles secondaires, le nombre d’entrecoeurs et la surface foliaire et nombre de feuilles de l‘entrecoeur major et minore. La surface foliaire de chacun de ces deux entrecoeurs est estimé avec un modèle similaire a celui proposé pour les feuilles principales mais sans la longueur du rameau. Ces modèles ont été validés avec des données indépendants d’un échantillon de sarments prélevés périodiquement dans la saison. D’après les bons résultats de la validation on peut dire que, avec ces modèles, on peut estimer rapidement la surface foliaire total d’un sarment, de façon non destructive et avec une bonne précisioninfo:eu-repo/semantics/publishedVersio

Aplicação de um modelo de simulação do desenvolvimento da batateira à cultura da batata primor na região do Oeste

Apresenta-se um modelo de simulação do desenvolvimento da batateira aplicado ao caso particular da batata-primor na região do Oeste. Comparam-se os resultados do modelo com observações de campo efectuadas no concelho da Lourinhã, no ano de 1987, para a variedade Spunta em três densidades de plantação. Finalmente apresentam-se as potencialidades de utilização do modeloinfo:eu-repo/semantics/publishedVersio

Human and murine IFIT1 proteins do not restrict infection of negative-sense RNA viruses of the Orthomyxoviridae, Bunyaviridae, and Filoviridae families

UNLABELLED: Interferon-induced protein with tetratricopeptide repeats 1 (IFIT1) is a host protein with reported cell-intrinsic antiviral activity against several RNA viruses. The proposed basis for the activity against negative-sense RNA viruses is the binding to exposed 5\u27-triphosphates (5\u27-ppp) on the genome of viral RNA. However, recent studies reported relatively low binding affinities of IFIT1 for 5\u27-ppp RNA, suggesting that IFIT1 may not interact efficiently with this moiety under physiological conditions. To evaluate the ability of IFIT1 to have an impact on negative-sense RNA viruses, we infected Ifit1(-/-) and wild-type control mice and primary cells with four negative-sense RNA viruses (influenza A virus [IAV], La Crosse virus [LACV], Oropouche virus [OROV], and Ebola virus) corresponding to three distinct families. Unexpectedly, a lack of Ifit1 gene expression did not result in increased infection by any of these viruses in cell culture. Analogously, morbidity, mortality, and viral burdens in tissues were identical between Ifit1(-/-) and control mice after infection with IAV, LACV, or OROV. Finally, deletion of the human IFIT1 protein in A549 cells did not affect IAV replication or infection, and reciprocally, ectopic expression of IFIT1 in HEK293T cells did not inhibit IAV infection. To explain the lack of antiviral activity against IAV, we measured the binding affinity of IFIT1 for RNA oligonucleotides resembling the 5\u27 ends of IAV gene segments. The affinity for 5\u27-ppp RNA was approximately 10-fold lower than that for non-2\u27-O-methylated (cap 0) RNA oligonucleotides. Based on this analysis, we conclude that IFIT1 is not a dominant restriction factor against negative-sense RNA viruses. IMPORTANCE: Negative-sense RNA viruses, including influenza virus and Ebola virus, have been responsible for some of the most deadly outbreaks in recent history. The host interferon response and induction of antiviral genes contribute to the control of infections by these viruses. IFIT1 is highly induced after virus infection and reportedly has antiviral activity against several RNA and DNA viruses. However, its role in restricting infection by negative-sense RNA viruses remains unclear. In this study, we evaluated the ability of IFIT1 to inhibit negative-sense RNA virus replication and pathogenesis both in vitro and in vivo. Detailed cell culture and animal studies demonstrated that IFIT1 is not a dominant restriction factor against three different families of negative-sense RNA viruses

MAXIMUM NUMBER OF REPETITIONS, TOTAL WEIGHT LIFTED AND NEUROMUSCULAR FATIGUE IN INDIVIDUALS WITH DIFFERENT TRAINING BACKGROUNDS

The aim of this study was to evaluate the performance, as well as neuromuscular activity, in a strength task in subjects with different training backgrounds. Participants (n = 26) were divided into three groups according to their training backgrounds (aerobic, strength or mixed) and submitted to three sessions: (1) determination of the maximum oxygen uptake during the incremental treadmill test to exhaustion and familiarization of the evaluation of maximum strength (1RM) for the half squat; (2) 1RM determination; and (3) strength exercise, four sets at 80�0of the 1RM, in which the maximum number of repetitions (MNR), the total weight lifted (TWL), the root mean square (RMS) and median frequency (MF) of the electromyographic (EMG) activity for the second and last repetition were computed. There was an effect of group for MNR, with the aerobic group performing a higher MNR compared to the strength group (P = 0.045), and an effect on MF with a higher value in the second repetition than in the last repetition (P = 0.016). These results demonstrated that individuals with better aerobic fitness were more fatigue resistant than strength trained individuals. The absence of differences in EMG signals indicates that individuals with different training backgrounds have a similar pattern of motor unit recruitment during a resistance exercise performed until failure, and that the greater capacity to perform the MNR probably can be explained by peripheral adaptations

Controlling a leaky tap

We apply the Ott, Grebogy and Yorke mechanism for the control of chaos to the analytical oscillator model of a leaky tap obtaining good results. We exhibit the robustness of the control against both dynamical noise and measurement noise.A possible way of controlling experimentally a leaky tap using magnetic-field-produced variations in the viscosity of a magnetorheological fluid is suggested.Comment: 14 pages, 12 figures. Submitted to Physics Letters

Higher Order Evaluation of the Critical Temperature for Interacting Homogeneous Dilute Bose Gases

We use the nonperturbative linear \delta expansion method to evaluate analytically the coefficients c_1 and c_2^{\prime \prime} which appear in the expansion for the transition temperature for a dilute, homogeneous, three dimensional Bose gas given by T_c= T_0 \{1 + c_1 a n^{1/3} + [ c_2^{\prime} \ln(a n^{1/3}) +c_2^{\prime \prime} ] a^2 n^{2/3} + {\cal O} (a^3 n)\}, where T_0 is the result for an ideal gas, a is the s-wave scattering length and n is the number density. In a previous work the same method has been used to evaluate c_1 to order-\delta^2 with the result c_1= 3.06. Here, we push the calculation to the next two orders obtaining c_1=2.45 at order-\delta^3 and c_1=1.48 at order-\delta^4. Analysing the topology of the graphs involved we discuss how our results relate to other nonperturbative analytical methods such as the self-consistent resummation and the 1/N approximations. At the same orders we obtain c_2^{\prime\prime}=101.4, c_2^{\prime \prime}=98.2 and c_2^{\prime \prime}=82.9. Our analytical results seem to support the recent Monte Carlo estimates c_1=1.32 \pm 0.02 and c_2^{\prime \prime}= 75.7 \pm 0.4.Comment: 29 pages, 3 eps figures. Minor changes, one reference added. Version in press Physical Review A (2002

Cirurgia Bariátrica: Caderno Educativo para Pacientes em tratamento da Obesidade Grave

E-bookEstudo de técnicas cirúrgica

SIAMVITI – Viticultura portuguesa num cenário de alterações climáticas: Impactos e medidas de adaptação

info:eu-repo/semantics/publishedVersio