203 research outputs found

    Efeito de glifosato em lipoxigenase de semente de caupi (Vigna unguiculata (L.) Walp.).

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    A atividade máxima de lipoxigenase em sementes de caupi (Vigna unguiculata (L.) Walp.) foi obtida com cálcio a 0,68 mM e pH 7.5. Sementes foram analisadas durante a germinação e a atividade especifica de lipoxigenase diminuiu durante o processo. Sementes de plantas tratadas com o herbicida glifosato [N - (fosofonometil) glicina] como dessecante, mostraram significante aumento da atividade especifica de lipooxigenase. Isto pode ser resultado do efeito do herbicida nas plantas. Tal conclusao e baseada no fato de que lipoxigenase, que teve sua atividade especifica aumentada pelo glifosato, pode promover a formação do ácido 12-oxo-fitodienoico que por sua vez É um possível precursor do acido jasmônico, um regulador de crescimento que promove senescência em plantas, explicando desta maneira a ação do herbicida nas mesmas. Pelo método utilizado, não foi encontrada a enzima em folhas ou outras partes verdes das plantas

    Five-loop renormalisation of QCD in covariant gauges

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    We present the complete set of vertex, wave function and charge renormalisation constants in QCD in a general simple gauge group and with the complete dependence on the covariant gauge parameter ξ\xi in the minimal subtraction scheme of conventional dimensional regularisation. Our results confirm all already known results, which were obtained in the Feynman gauge, and allow the extraction of other useful gauges such as the Landau gauge. We use these results to extract the Landau gauge five-loop anomalous dimensions of the composite operator A2A^2 as well as the Landau gauge scheme independent gluon, ghost and fermion propagators at five loops.Comment: 17 pages; FORM and Mathematica result files available with the source; corrected minor typos, added references, journal ref, 1 remark, 1 note and 1 additional result fil

    Multicentre evaluation of the Boehringer Mannheim / Hitachi 911 Analysis System

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    The analytical performance and practicability of the Boehringer Mannheim (BM)/mtaci 91 analysis system have been assessed in a multicentre evaluation, which involved six laboratories from European countries. Analytes commonly used in classical clinical chemistry were tested in a core programme, which mainlyfollowed lhe ECCLS guidelines. In addition, a satellite programme covered other analytes, such as proteins, drugs and urine analytes. In total, the study comprised more than 100 000 data items collected over a three-month period. The evaluation was supported with 'Computer Aided Evaluation' (CAEv) and telecommunications. Acceptance criteria for the results were established at the beginning ofthe study. Nearly all ofthe analytes met the imprecision limits.' within-run imprecision (as CVs) was 2l/ofor enzyme and substrate assays, l%for ISE methods and 5l/o for immunoassays; between-day imprecision was 3l/ofor enzyme and substrate assays, 2o//o for ISE methods and 10% for immunoassays

    Looking through the QCD conformal window with perturbation theory

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    We study the conformal window of QCD using perturbation theory, starting from the perturbative upper edge and going down as much as we can towards the strongly coupled regime. We do so by exploiting the available five-loop computation of the overlinemMSoverline{{m MS}} etaeta-function and employing Borel resummation techniques both for the ordinary perturbative series and for the Banks-Zaks conformal expansion. Large-nfn_f results are also used. We argue that the perturbative series for the overlinemMSoverline{{m MS}} etaeta-function is most likely asymptotic and non-Borel resummable, yet Borel resummation techniques allow to improve on ordinary perturbation theory. We find substantial evidence that QCD with nf=12n_f=12 flavours flows in the IR to a conformal field theory. Though the evidence is weaker, we find indications that also nf=11n_f=11 might sit within the conformal window. We also compute the value of the mass anomalous dimension gammagamma at the fixed point and compare it with the available lattice results. The conformal window might extend for lower values of nfn_f, but our methods break down for n_f<11, where we expect that non-perturbative effects become important. A similar analysis is performed in the Veneziano limit

    Free will and mental disorder: Exploring the relationship

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    A link between mental disorder and freedom is clearly present in the introduction of the fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV). It mentions “an important loss of freedom” as one of the possible defining features of mental disorder. Meanwhile, it remains unclear how “an important loss of freedom” should be understood. In order to get a clearer view on the relationship between mental disorder and (a loss of) freedom, in this article, I will explore the link between mental disorder and free will. I examine two domains in which a connection between mental disorder and free will is present: the philosophy of free will and forensic psychiatry. As it turns out, philosophers of free will frequently refer to mental disorders as conditions that compromise free will and reduce moral responsibility. In addition, in forensic psychiatry, the rationale for the assessment of criminal responsibility is often explained by referring to the fact that mental disorders can compromise free will. Yet, in both domains, it remains unclear in what way free will is compromised by mental disorders. Based on the philosophical debate, I discuss three senses of free will and explore their relevance to mental disorders. I conclude that in order to further clarify the relationship between free will and mental disorder, the accounts of people who have actually experienced the impact of a mental disorder should be included in future research

    Exploring the similarities and differences between medical assessments of competence and criminal responsibility

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    The medical assessments of criminal responsibility and competence to consent to treatment are performed, developed and debated in distinct domains. In this paper I try to connect these domains by exploring the similarities and differences between both assessments. In my view, in both assessments a decision-making process is evaluated in relation to the possible influence of a mental disorder on this process. I will argue that, in spite of the relevance of the differences, both practices could benefit from the recognition of this similarity. For cooperative research could be developed directed at elucidating exactly how various mental disturbances can affect decision-making processes
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