1,507 research outputs found
Nonextensive Quantum H-Theorem
A proof of the quantum -theorem taking into account nonextensive effects
on the quantum entropy is shown. The positiveness of the time variation
of combined with a duality transformation implies that the nonextensive
parameter lies in the interval [0,2]. It is also shown that the equilibrium
states are described by quantum -power law extensions of the Fermi-Dirac and
Bose-Einstein distributions. Such results reduce to the standard ones in the
extensive limit, thereby showing that the nonextensive entropic framework can
be harmonized with the quantum distributions contained in the quantum
statistics theory.Comment: 5 pages, LaTe
Primary prophylaxis of neutropenia in women affected by breast cancer undergoing adjuvant chemotherapy with fec 100+/- docetaxel. Comparison of efficacy and tolerability between lenograstim and pegfilgrastim
Objectives: evaluate safety and toxicity of a single injection of pegfilgrastim compared
to daily administration of lenograstim in breast cancer patient undergoing adjuvant
chemotherapy
A Layman's guide to SUSY GUTs
The determination of the most straightforward evidence for the existence of
the Superworld requires a guide for non-experts (especially experimental
physicists) for them to make their own judgement on the value of such
predictions. For this purpose we review the most basic results of Super-Grand
unification in a simple and clear way. We focus the attention on two specific
models and their predictions. These two models represent an example of a direct
comparison between a traditional unified-theory and a string-inspired approach
to the solution of the many open problems of the Standard Model. We emphasize
that viable models must satisfy {\em all} available experimental constraints
and be as simple as theoretically possible. The two well defined supergravity
models, and , can be described in terms of only a few
parameters (five and three respectively) instead of the more than twenty needed
in the MSSM model, \ie, the Minimal Supersymmetric extension of the Standard
Model. A case of special interest is the strict no-scale
supergravity where all predictions depend on only one parameter (plus the
top-quark mass). A general consequence of these analyses is that supersymmetric
particles can be at the verge of discovery, lurking around the corner at
present and near future facilities. This review should help anyone distinguish
between well motivated predictions and predictions based on arbitrary choices
of parameters in undefined models.Comment: 25 pages, Latex, 11 figures (not included), CERN-TH.7077/93,
CTP-TAMU-65/93. A complete ps file (1.31MB) with embedded figures is
available by request from [email protected]
Metodologia do isolamento de embrião zigótico de cajueiro-anão precoce in vitro.
bitstream/item/55341/1/COT11016.pd
The interaction of native DNA with Zn(II) and Cu(II) complexes of 5-triethyl ammonium methyl salicylidene orto-phenylendiimine
The interaction of native calf thymus DNA with the Zn(II) and Cu(II) complexes of 5-triethyl ammonium methyl salicylidene ortophenylendiimine (ZnL2+ and CuL2+), in 1 mM Tris-HCl aqueous solutions at neutral pH, has been monitored as a function of the metal complex-DNA molar ratio by UV absorption spectro photometry, circular dichroism (CD) and fluorescence spectroscopy. The results support for an intercalative interaction of both ZnL2+ and CuL2+ with DNA, showing CuL2+ an affinity of approximately 10 times higher than ZnL2+. In particular, the values of the binding constant, determined by UV spectrophotometric titration, equal to 7.3 x 10(4) and 1.3 x 10(6) M-1. for ZnL2+ and CuL2+, respectively, indicate the occurrence of a marked interaction with a binding size of about 0.7 in base pairs. The temperature dependence of the absorbance at 258 nm suggests that both complexes strongly increase the DNA melting temperature (Tm) already at metal complex-DNA molar ratios equal to 0.1. As evidenced by the quenching of the fluorescence of ethidium bromide-DNA solutions in the presence of increasing amounts of metal complex, ZnL2+ and CuL2+ are able to displace the ethidium cation intercalated into DNA. A tight ZnL2+-DNA and CuL2+-DNA binding has been also proven by the appearance, in both metal complex-DNA solutions, of a broad induced CD band in the range 350-450 nm. In the case of the CuL2+-DNA system, the shape of the CD spectrum, at high CuL2+ content, is similar to that observed for psi-DNA solutions. Such result allowed us to hypothesize that CuL2+ induces the formation of supramolecular aggregates of DNA in aqueous solutions
Planck Scale Physics and the Testability of SU(5) Supergravity GUT
GUT scale threshold corrections in minimal SU(5) supergravity grand
unification are discussed. It is shown that predictions may be made despite
uncertainties associated with the high energy scale. A bound relating the
strong coupling constant to the mass scales associated with proton decay and
supersymmetry is derived, and a sensitive probe of the underlying theory is
outlined. In particular, low energy measurements can in principle determine the
presence of Planck scale () terms.Comment: 12 pages, REVTeX, 2 figures included in an uuencoded Z-compressed
PostScript file. Ready to print PostScript version (with figures) may be
picked up at ftp://phys.tamu.edu/urano/planck/paper_prep.p
Methadone Intoxication in a Child: Toxic Encephalopathy?
Methadone is used in the treatment of opioid addiction. Acute intoxication can lead to severe consequences and can even be lethal. In several case reports and small series, a presumably toxic leukoencephalopathy is described resulting from inhalation of heroin. We present the case of a 3-year-old boy who ingested methadone accidentally. In a coma with acute obstructive hydrocephalus owing to massive cerebellar edema and supratentorial lesions, he was successfully treated with methylprednisolone and cerebrospinal fluid external drainage. To our knowledge, this is the first report of an encephalopathy associated with synthetic opioid intoxication
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