Renormalization group approach of itinerant electron systems near the Lifshitz point

Using the renormalization approach proposed by Millis for the itinerant electron systems we calculated the specific heat coefficient $\gamma(T)$ for the magnetic fluctuations with susceptibility $\chi^{-1}\sim |\delta+\omega|^\alpha+f(q)$ near the Lifshitz point. The constant value obtained for $\alpha=4/5$ and the logarithmic temperature dependence, specific for the non-Fermi behavior, have been obtained in agreement with the experimental dat.Comment: 6 pages, Revte

Universal corrections to the Fermi-liquid theory

We show that the singularities in the dynamical bosonic response functions of a generic 2D Fermi liquid give rise to universal, non-analytic corrections to the Fermi-liquid theory. These corrections yield a $T^2$ term in the specific heat, $T$ terms in the effective mass and the uniform spin susceptibility $\chi_s (Q=0,T)$, and $|Q|$ term in $\chi_s (Q,T=0)$. The existence of these terms has been the subject of recent controversy, which is resolved in this paper. We present exact expressions for all non-analytic terms to second order in a generic interaction $U(q)$ and show that only U(0) and $U(2p_F)$ matter.Comment: references added, a typo correcte

Withdrawal of maintenance therapy for cytomegalovirus retinitis in AIDS patients exhibiting immunological response to HAART

BACKGROUND: Before the introduction of highly active antiretroviral therapy (HAART), CMV retinitis was a common complication in patients with advanced HIV disease and the therapy was well established; it consisted of an induction phase to control the infection with ganciclovir, followed by a lifelong maintenance phase to avoid or delay relapses. METHODS: To determine the safety of CMV maintenance therapy withdrawal in patients with immune recovery after HAART, 35 patients with treated CMV retinitis, on maintenance therapy, with CD4+ cell count greater than 100 cells/mm³ for at least three months, but almost all patients presented these values for more than six months and viral load < 30000 copies/mL, were prospectively evaluated for the recurrence of CMV disease. Maintenance therapy was withdrawal at inclusion, and patients were monitored for at least 48 weeks by clinical and ophthalmologic evaluations, and by determination of CMV viremia markers (antigenemia-pp65), CD4+/CD8+ counts and plasma HIV RNA levels. Lymphoproliferative assays were performed on 26/35 patients. RESULTS: From 35 patients included, only one had confirmed reactivation of CMV retinitis, at day 120 of follow-up. No patient returned positive antigenemia tests. No correlation between lymphoproliferative assays and CD4+ counts was observed. CONCLUSION: CMV retinitis maintenance therapy discontinuation is safe for those patients with quantitative immune recovery after HAART

Pore-Scale Distribution of Mucilage Affecting Water Repellency in the Rhizosphere

The physical properties of the rhizosphere are strongly influenced by root-exuded mucilage, and there is increasing evidence that mucilage affects the wettability of soils on drying. We introduce a conceptual model of mucilage deposition during soil drying and its impact on soil wettability. We hypothesized that as soil dries, water menisci recede and draw mucilage toward the contact region between particles. At low mucilage contents (milligrams per gram of soil), mucilage deposits have the shape of thin filaments that are bypassed by infiltrating water. At higher contents, mucilage deposits occupy a large fraction of the pore space and make the rhizosphere hydrophobic. This hypothesis was confirmed by microscope images and contact angle measurements. We measured the initial contact angle of quartz sand (0.5–0.63- and 0.125–0.2-mm diameter), silt (36–63-μm diameter), and glass beads (0.1–0.2-mm diameter) mixed with varying amounts of chia ( L.) seed mucilage (dry content range 0.2–19 mg g) using the sessile drop method. We observed a threshold-like occurrence of water repellency. At low mucilage contents, the water drop infiltrated within 300 ms. Above a critical mucilage content, the soil particle–mucilage mixture turned water repellent. The critical mucilage content decreased with increasing soil particle size. Above this critical content, mucilage deposits have the shape of hollow cylinders that occupy a large fraction of the pore space. Below the critical mucilage content, mucilage deposits have the shape of thin filaments. This study shows how the microscopic heterogeneity of mucilage distribution impacts the macroscopic wettability of mucilage-embedded soil particles

Guideliness In Paracoccidioidomycosis [consenso Em Paracoccidioidomicose]

[No abstract available]393297310Coutinho, Z.F., Silva, D., Lazera, M., Petri, V., Oliveira, R.M., Sabroza, P.C., Wanke, B., Paracoccidioidomycosis mortality in Brazil (1980-1995) (2002) Cadernos de Saúde Publica, 18, pp. 1441-1454. , Rio de JaneiroLacaz, C.S., Porto, E., Martins, J.E.C., Heins-Vaccari, E.M., Melo, N.T., Paracoccidioidomicose (2002) Tratado de Micologia Médica Lacaz, pp. 639-729. , Lacaz CS, Porto E, Martins JEC, Heins-Vaccari EM, Melo NT (eds) Sarvier Editora de Livros Médicos Ltda., São PauloRestrepo-Moreno, A., Ecology of Paracoccidioides brasiliensis (1994) Paracoccidioidomycosis, 1 st Edition, pp. 121-130. , Franco MF, Lacaz CS, Restrepo-Moreno A, Del Negro G (eds) CRC Press, Boca RatonValle, A.C.F., Wanke, B., Wanke, N., Peixoto, T.C., Perez, M., Tratamento da paracoccidioidomicose: Estudo retrospectivo de 500 casos. 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Tratamento Com Itraconazol. 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