Reação de genótipos de abacaxizeiro ao nematoide Pratylenchus Brachyurus.

Os fitonematoides são considerados um dos principais fatores limitantes ao cultivo do abacaxizeiro. Estes patógenos causam danos consideráveis às raízes das plantas, diminuindo a eficiência das adubações pela redução da absorção de nutrientes. As plantas apresentam sistema radicular reduzido, folhas cloróticas, estreitas e de tamanho reduzido. Consequentemente, a produção é retardada e com frutos de baixo peso e valor comercial reduzido (Arieira et al., 2008)

Generalised Hong-Ou-Mandel Experiments with Bosons and Fermions

The Hong-Ou-Mandel (HOM) dip plays an important role in recent linear optics experiments. It is crucial for quantum computing with photons and can be used to characterise the quality of single photon sources and linear optics setups. In this paper, we consider generalised HOM experiments with $N$ bosons or fermions passing simultaneously through a symmetric Bell multiport beam splitter. It is shown that for even numbers of bosons, the HOM dip occurs naturally in the coincidence detection in the output ports. In contrast, fermions always leave the setup separately exhibiting perfect coincidence detection. Our results can be used to verify or employ the quantum statistics of particles experimentally.Comment: 11 pages, 2 figures, more references adde

Repetibilidade da idade ao primeiro parto, intervalo de partos e peso ao parto em bovinos da Rraça Nelore.

Utilizaram-se 407 observações de idade ao primeiro parto, 971 de intervalo de partos e 587 de peso ao parto de vacas da raça Nelore, para avaliar os efeitos de alguns fatores sobre essas características e estimar seus coeficientes de repetibilidade

Geodesic motion in the space-time of a cosmic string

We study the geodesic equation in the space-time of an Abelian-Higgs string and discuss the motion of massless and massive test particles. The geodesics can be classified according to the particles energy, angular momentum and linear momentum along the string axis. We observe that bound orbits of massive particles are only possible if the Higgs boson mass is smaller than the gauge boson mass, while massless particles always move on escape orbits. Moreover, neither massive nor massless particles can ever reach the string axis for non-vanishing angular momentum. We also discuss the dependence of light deflection by a cosmic string as well as the perihelion shift of bound orbits of massive particles on the ratio between Higgs and gauge boson mass and the ratio between symmetry breaking scale and Planck mass, respectively.Comment: 20 pages including 14 figures; v2: references added, discussion on null geodesics extended, numerical results adde

Analogue peptides for the immunotherapy of human acute myeloid leukemia

Accepted manuscript. The final publication is available at: http://link.springer.com/article/10.1007%2Fs00262-015-1762-9The use of peptide vaccines, enhanced by adjuvants, has shown some efficacy in clinical trials. However, responses are often short-lived and rarely induce notable memory responses. The reason is that self-antigens have already been presented to the immune system as the tumor develops, leading to tolerance or some degree of host tumor cell destruction. To try to break tolerance against self-antigens, one of the methods employed has been to modify peptides at the anchor residues to enhance their ability to bind major histocompatibility complex molecules, extending their exposure to the T-cell receptor. These modified or analogue peptides have been investigated as stimulators of the immune system in patients with different cancers with variable but sometimes notable success. In this review we describe the background and recent developments in the use of analogue peptides for the immunotherapy of acute myeloid leukemia describing knowledge useful for the application of analogue peptide treatments for other malignancies

Reliability of the tuck jump injury risk screening assessment in elite male youth soccer players

Altered neuromuscular control has been suggested as a mechanism for injury in soccer players. Ligamentous injuries most often occur during dynamic movements, such as decelerations from jump-landing maneuvers where high risk movement patterns are present. The assessment of kinematic variables during jump-landing tasks as part of a pre-participation screen is useful in the identification of injury risk. An example of a field-based screening tool is the repeated tuck jump assessment. The purpose of this study was to analyze the within-subject variation of the tuck jump screening assessment in elite male youth soccer players. 25 pre and 25 post-peak height velocity (PHV) elite male youth soccer players from the academy of a professional English soccer club completed the assessment. A test, re-test design was used to explore the within-subject inter-session reliability. Technique was graded retrospectively against the 10-point criteria set out in the screening protocol using two-dimensional video cameras. The typical error range reported for tuck jump total score (0.90 – 1.01 in pre and post-PHV players respectively) was considered acceptable. When each criteria was analyzed individually, Kappa coefficient determined that knee valgus was the only criterion to reach substantial agreement across the two test sessions for both groups. The results of this study suggest that although tuck jump total score may be reliably assessed in elite male youth soccer players, caution should be applied in solely interpreting the composite score due to the high within-subject variation in a number of the individual criteria. Knee valgus may be reliably used to screen elite youth male soccer players for this plyometric technique error and for test, re-test comparison

Comment to "ultrasonic assessment of females with carpal tunnel syndrome proved by nerve conduction study"

Letter to the Edito

Teachers' digital competence to assist students with functional diversity: Identification of factors through logistic regression methods

We are experiencing a serious health crisis due to COVID-19 that has a major impact on the field of education. The educational system therefore needs to be updated and innovated, with the addition of digital resources, to adapt the teaching and learning processes to students with disabilities. To meet the goal of high quality education, teachers must have adequate digital competence to face the educational demands that are placed on them. Therefore, the purposes of this study are: to know the teachers' knowledge about digital resources to support students with disabilities (O1); at each educational stage (O2), identify the variables that have a significant impact on the acquisition of teacher competence (O3); propose a selection of useful ICT resources for each type of disability (O4). An ex post facto design was used with 1194 teachers from Andalusia (Spain). The results showed the medium-low level of the teaching staff, especially in the higher education stage. In addition, gender, motivation, attitude and having students with special needs are determining factors in the development of teacher knowledge. The results highlight the urgent need for teachers to be trained in digital resources. We hope that the range of resources proposed in this study will help teachers enhance their teaching practic

Digital Competence of university students with disabilities and factors that determine it. A descriptive, inferential and multivariate study

Taking into account that 15% of the world population suffers from some type of disability, few investigations have been concerned with knowing the level of digital competenceDigital Competence that students with functional diversity have. This research is based on an initial sample of 17,301 newly enrolled university students from the Andrés Bello University (Chile), of which 650 are selected for having some type of disability. Its main objective is to know the level of self-perception in the digital competenceDigital Competence of university students with disabilities and the variables that explain it. To do this, an evaluation instrument consisting of 6 dimensions (technological literacy, information search and processing, critical thinking, problem solving and decision making, communication and collaboration, digital citizenship, and communication and collaboration) is designed and applied. To calculate the validity of the instrument, the partial least squares (PLS) method is applied through structural equation modeling. Next, data is provided regarding the level of Digital CompetenceDigital Competence of the students and if there are differences between the types of disability. Finally, the data is subjected to a logistic regression to estimate the relationship between the dependent variable (digital competenceDigital Competence) and a set of independent variables (sociodemographic variables). The results reveal that the instrument used shows high levels of reliability, which guarantees its use in students with disabilities. Likewise, the average level of digital competenceDigital Competence is medium low. Finally, tThe factors that affect this variable are discussed and the necessary structuring of digital literacy plans is highlighted. Finally, this paper discusses new techniques for diagnosing students' digital skills