A proof of the Grothendieck-Serre conjecture on principal bundles over regular local rings containing infinite fields

Let R be a regular local ring, containing an infinite field. Let G be a reductive group scheme over R. We prove that a principal G-bundle over R is trivial, if it is trivial over the fraction field of R.Comment: Section "Formal loops and affine Grassmannians" is removed as this is now covered in arXiv:1308.3078. Exposition is improved and slightly restructured. Some minor correction

Riesgo de transfusión perioperatoria en la cirugía del fémur

Se analiza el riesgo perioperatorio de ser transfundido de los pacientes intervenidos de fémur a partir de los datos codificados de los informes de alta. Se han incluido los pacientes operados de fémur durante 1996, codificados según la Clasificación Internacional de Enfermedades (CIE-9-MC), recogiéndose la edad, sexo, los códigos de diagnósticos, de procedimientos, incluidas las transfusiones, y de las intervenciones quirúrgicas. Fueron operados 256 pacientes, de los que 64 (25%) fueron transfundidos. Mediante análisis univariante, el mayor riesgo transfusional, (con significación estadística), es en pacientes mayores de 70 años (29.5%), pacientes con fracturas de fémur (27.7%), y pacientes a los que se realizaron tres o más técnicas quirúrgicas durante la intervención (50%). Mediante regresión logística, la edad y el número de técnicas realizadas, son los factores asociados con el riesgo de transfusión, siendo la probabilidad de transfusión en los pacientes con mayores de 70 años 2.49 veces respecto a los mayores de 70 años (p:0.01), y de 4.03 veces cuando se realizan 3 o más técnicas respecto al grupo con 1 o 2 técnicas (p:0.015). La edad y la complejidad de la operación son los factores con carácter pronóstico del riesgo de transfusión en la cirugía de fémur.The purpose is to analyse the likelihood of perioperative transfusion in fémur surgery ping the data of the abstracted patient discharge records. Patients with femur surgical procedures patient performed during 1996 in the Central Hospital of Asturas were studied. The abstracted patient discharge records were codified according to the ICD-0 CM codes. Gender, age, diagnosis, procedures, among them the transfusions of blood derivates and the surgical procedures were analysed. Out of 256 operated patients, 64 (25%) were transfused. The groups of patients more frequently transfused were those more older than 70 years (29.5), femur fracture (27.7%) and patients undergoing three o more surgical techniques during the surgical intervention (50%). By multivariate logistic regression analysis, the age and the number of surgical techniques where factors independently related with the likelihood of being transfused. The adjusted odds ratio of perioperative transfusion in patients than 70 year in 2.49 times in relation with the rest of people (p:0.01), and in patients who undergoing three or more surgical techniques 4.03 times in relation to those with 1 or 2 surgeries (p:0.015). Among the variables studied, age and the number surgical techniques (as an indirect surgical complexity index) are factors independently related with the likelihood of being transfused

Witt groups of the punctured spectrum of a 3-dimensional regular local ring and a purity theorem

Let A be a regular local ring with quotient field K. Assume that 2 is invertible in A. Let W(A)→W(K) be the homomorphism induced by the inclusion A→K, where W( ) denotes the Witt group of quadratic forms. If dim A≤ 4, it is known that this map is injective [6,7]. A natural question is to characterize the image of W(A) in W(K). Let Spec1(A) be the set of prime ideals of A of height 1. For PεSpec1(A), let πP be a parameter of the discrete valuation ring AP and k(P)=AP/PAP. For this choice of a parameter πP, one has the second residue homomorphism ∂P:W(K)→W(k(P)) [9, p. 209]. Though the homomorphism πP depends on the choice of the parameter πP, its kernel and cokernel do not. We have a homomorphism ∂=∂P:W(K)→⊕PεSpec1(A)W(k(P)) A part of the so-called Gersten conjecture is the following question on 'purity'. Is the sequence W(A)→W(K)→∂⊕PεSpec1(A)W(k(P)) exact? This question has an affirmative answer for dim(A)≤2 [1; 3, p. 277]. There have been speculations by Pardon and Barge-Sansuc-Vogel on the question of purity. However, in the literature, there is no proof for purity even for dim(A)=3. One of the consequences of the main result of this paper is an affirmative answer to the purity question for dim(A)=3. We briefly outline our main result

Witt Groups of the Punctured Spectrum of a 3-Dimensional Regular Local Ring and a Purity Theorem

Let A be a regular local ring with quotient field K. Assume that 2 is invertible in A. Let W(A)→W(K) be the homomorphism induced by the inclusion A↪K, where W( ) denotes the Witt group of quadratic forms. If dim A≤4, it is known that this map is injective [6, 7]. A natural question is to characterize the image of W(A) in W(K). Let Spec1(A) be the set of prime ideals of A of height 1. For P∈Spec1(A), let πP be a parameter of the discrete valuation ring AP and k(P) = AP/PAP. For this choice of a parameter πP, one has the second residue homomorphism ∂P:W(K)→W(k(P)) [9, p. 209]. Though the homomorphism ∂P depends on the choice of the parameter πP, its kernel and cokernel do not. We have a homomorphism ∂=( ∂ P ) :W( K ) → ⊕ P∈Spe c 1 ( A )  W( K( P ) ) A part of the so-called Gersten conjecture is the following question on ‘purity'. Is the sequence W( A ) →W( K ) → ∂ ⊕ P∈Spe c 1 ( A )  W( K( P ) ) exact? This question has an affirmative answer for dim(A)≤2 [1; 3, p. 277]. There have been speculations by Pardon and Barge-Sansuc-Vogel on the question of purity. However, in the literature, there is no proof for purity even for dim(A) = 3. One of the consequences of the main result of this paper is an affirmative answer to the purity question for dim(A) = 3. We briefly outline our main resul

Rumikiru, n. gen. (Scorpiones: Bothriuridae), a new scorpion genus from the Atacama Desert

Rumikiru, n. gen., a new bothriurid scorpion genus from the coastal Atacama Desert, Chile, is described. This is the first scorpion genus endemic to northern Chile. It is most closely related to Pachakutej Ochoa, 2004, from the inter-Andean valleys of Peru. Orobothriurus lourencoi Ojanguren-Affilastro, 2003, is transferred to the new genus and redescribed, creating Rumikiru lourencoi (Ojanguren-Affilastro, 2003), n. comb., and a second species of the genus, Rumikiru atacama, n. sp., is described.Fil: Ojanguren Affilastro, Andres Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Mattoni, Camilo Ivan. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Cátedra de Diversidad Animal I; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ochoa, José A.. Universidade de Sao Paulo; Brasil. Universidad Nacional de San Antonio Abad del Cusco. Museo de Historia Natural; PerúFil: Prendini, Lorenzo. American Museum Of Natural History; Estados Unido

Epigean Insects of Chañaral Island (Pingüino de Humboldt National Reserve, Atacama, Chile)

The Pingüino de Humboldt National Reserve in Chile is an area of biodiversity conservation in arid island ecosystems. The reserve is located both in the Atacama and Coquimbo regions and is composed of the Choros (29º 15’ S, 71º 32’ W), Damas (29º 13’ S, 71º 31’ W) and Chañaral (29°02’ S, 71°36’ W) islands. Pitfall traps were used to study the taxonomic diversity of epigean insects in Chañaral Island. The study area was divided into 3 vegetationally contrasting ecotopes: E1 represented by a subdesert steppe, E2 represented by a xeric shrubland and E3 represented by a xeric shrub steppe. A total of 730 specimens were captured, belonging to 40 species arranged in 34 genera and 17 families. Four insect orders were recorded, of which the most diverse were Coleoptera, with 29 species, and Hymenoptera, with 7 species. Coleoptera was the most represented group, with 24 genera grouped in 11 families. The richest families were Curculionidae (9 species) and Tenebrionidae (8 species). The highest species richness was recorded in E1 (28 species), followed by E2 (21 species) and E3 (19 species). The number of exclusive species varied between habitats, with E1 showing the highest number (14), and E2 and E3 being represented by 5 and 3 species, respectively. On the other hand, 10 species were common to all three sampled sites. The differences in vegetation between the sites were clearly reflected in the relative abundance and species richness of epigean insects. We did not record the presence of Gyriosomus granulipennis, an endemic species of Choros Island, which confirms that this species is restricted to a specific area of the reserve. This work is the first biological inventory of epigean insects on Chañaral Island.Fil: Pizarro Araya, Jaime. Universidad de la Serena; ChileFil: Alfaro, Fermin M.. Universidad de la Serena; Chile. Universidad de Chile; ChileFil: Cortes Contreras, Maximiliano. Universidad de la Serena; ChileFil: Rivera, Cristian. Reserva Nacional Pingüino de Humboldt; ChileFil: Vargas Talciani, Paola. Centro de Estudios Avanzados en Zonas Áridas; ChileFil: Ojanguren Affilastro, Andres Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

Criptococosis pulmonar que simula un cáncer de pulmón

Cryptococcosis; Pulmonary malignancyCriptococcosi; Càncer de pulmóCriptococosis; Cáncer de pulmó

Are anti-ganglioside antibodies detectable in serum from patients with critical illness myopathy and polyneuropathy?

Introduction: Critical illness myopathy (CIM) and polyneuropathy (CIP) are the most common cause of acquired weakness in intensive care units (ICU). However, its exact pathogenesis remains unclear. Abnormal excitability of muscle due to a sodium channelopathy is one of the mechanisms proposed. The aim of this study is to test for the presence of anti-ganglioside antibodies in serum from patients with CIM or both combined CIM/CIP, since there is evidence that they can cause reversible dysfunction of voltage-gated sodium channels.Methods: In a prospective way, we studied 35 patients admitted in ICU by weekly EMG. When positive spontaneous activity (PSA) was detected, a muscle biopsy was performed. Twenty patients met criteria of CIM; five of them also developed overlapping CIP. We did not detect any kind of abnormality in 10 patients during the follow up period. Sera were analyzed for the presence of anti-ganglioside antibodies (Ganglioside-profile 2 Euroline, Euroimmun). Results: Overall, positive reactivity against anti-GT1b was found in one patient with CIM, representing 2.8% (1/35) of the total sample.Conclusion: Reduced percentage of patients affected of CIM or CIM/CIP exhibits positive reactive against anti-ganglioside antibodies. Thus, it could be suggested they do not play a primary role in their pathogenesis. Key words: Critical illness myopathy, critical illness polineuropathy, difficult weaning, channelopathy, muscle fiber inexcitability, anti-ganglioside antibodies  DOI: http://dx.doi.org/10.17268/rmt.2020.v15i01.0