Pure spin current manipulation in antiferromagnetically exchange coupled heterostructures

We present a model to describe the spin currents generated by ferromagnet/spacer/ferromagnet exchange coupled trilayer systems and heavy metal layers with strong spin-orbit coupling. By exploiting the magnitude of the exchange coupling (oscillatory RKKY-like coupling) and the spin-flop transition in the magnetization process, it has been possible to produce spin currents polarized in arbitrary directions. The spin-flop transition of the trilayer system originates pure spin currents whose polarization vector depends on the exchange field and the magnetization equilibrium angles. We also discuss a protocol to control the polarization sign of the pure spin current injected into the metallic layer by changing the initial conditions of magnetization of the ferromagnetic layers previously to the spin pumping and inverse spin Hall effect experiments. The small differences in the ferromagnetic layers lead to a change in the magnetization vector rotation that permits the control of the sign of the induced voltage components due to the inverse spin Hall effect. Our results can lead to important advances in hybrid spintronic devices with new functionalities, particularly, the ability to control microscopic parameters such as the polarization direction and the sign of the pure spin current through the variation of macroscopic parameters, such as the external magnetic field or the thickness of the spacer in antiferromagnetic exchange coupled systems.Fil: Avilés Félix, L.. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Butera, Alejandro Ricardo. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Resonancias Magnéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: González Chávez, D. E.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: Sommer, R. L.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: Gomez, Javier Enrique. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Resonancias Magnéticas; Argentin

Detection of magnetic moment in thin films with a home-made vibrating sample magnetometer

This paper explores the optimization of an array of pick-up coils in a home-made vibrating sample magnetometer for the detection of magnetic moment in thin films. Sensitivity function of a 4-coils Mallinson configuration was numerically studied for the determination of the physical dimensions that enhance the sensitivity of the magnetometer. By performing numerical simulations using the Biot-Savart law combined with the principle of reciprocity we were able to determine the maximum values of sensitivity and the influence of the separation of the coils on the sensitivity function. After the optimization of the pick-up coils, the vibrating sample magnetometer was able to detect the magnetic moment of a 100 nm-thickness Fe19Ni81 magnetic thin film along and perpendicular to the in-plane anisotropy easy axis. The implemented vibrating sample magnetometer is able to detect changes in the magnetic moment of ∼2 × 10-4 emu.Fil: Jordán, D.. Universidad Nacional de Ingeniería. Facultad de Ciencias; PerúFil: González Chávez, D.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: Laura, D.. Universidad Nacional de Ingeniería. Facultad de Ciencias; PerúFil: Leon Hilario, Ludwin Misael. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Ingeniería. Facultad de Ciencias; PerúFil: Monteblanco, E.. Universite de Lorraine; FranciaFil: Gutarra Espinoza, Abel. Universidad Nacional de Ingeniería. Facultad de Ciencias; PerúFil: Aviles Felix, Luis Steven. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Resonancias Magnéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Caracterización del mercado de suelo baldío en Colima y Villa de Álvarez

El presente documento hace un estudio sobre los baldíos urbanos en la Ciudad de Colima y Villa de Álvarez Colima, México, se divide en tres vertientes principales: mercado de suelo, economía de suelo y suelo baldío. El fenómeno de baldíos es muy poco estudiado y más en el ámbito económico razón por la cual nuestro documento hace un análisis de lo global a lo particular, generando las herramientas que permitirán el estudio de dicho fenómeno más a detalle. Aunado a la teoría de la renta y a estudios de mercado.This paper makes a study of urban wasteland in the city of Colima and Villa de Alvarez Colima, Mexico, is divided into three main areas: land market, economy and ground floor vacant. The phenomenon is vacant and little studied in the economic reason our paper makes an analysis of the global to the particular generating tools that allow the study of this phenomenon more in detail. In addition to the theory of income and market research.Eje 2: Forma y estructura urbana, organización del territorio, orientación del crecimiento.Facultad de Arquitectura y Urbanism

Caracterización del mercado de suelo baldío en Colima y Villa de Álvarez

El presente documento hace un estudio sobre los baldíos urbanos en la Ciudad de Colima y Villa de Álvarez Colima, México, se divide en tres vertientes principales: mercado de suelo, economía de suelo y suelo baldío. El fenómeno de baldíos es muy poco estudiado y más en el ámbito económico razón por la cual nuestro documento hace un análisis de lo global a lo particular, generando las herramientas que permitirán el estudio de dicho fenómeno más a detalle. Aunado a la teoría de la renta y a estudios de mercado.This paper makes a study of urban wasteland in the city of Colima and Villa de Alvarez Colima, Mexico, is divided into three main areas: land market, economy and ground floor vacant. The phenomenon is vacant and little studied in the economic reason our paper makes an analysis of the global to the particular generating tools that allow the study of this phenomenon more in detail. In addition to the theory of income and market research.Eje 2: Forma y estructura urbana, organización del territorio, orientación del crecimiento.Facultad de Arquitectura y Urbanism

Caracterización del mercado de suelo baldío en Colima y Villa de Álvarez

El presente documento hace un estudio sobre los baldíos urbanos en la Ciudad de Colima y Villa de Álvarez Colima, México, se divide en tres vertientes principales: mercado de suelo, economía de suelo y suelo baldío. El fenómeno de baldíos es muy poco estudiado y más en el ámbito económico razón por la cual nuestro documento hace un análisis de lo global a lo particular, generando las herramientas que permitirán el estudio de dicho fenómeno más a detalle. Aunado a la teoría de la renta y a estudios de mercado.This paper makes a study of urban wasteland in the city of Colima and Villa de Alvarez Colima, Mexico, is divided into three main areas: land market, economy and ground floor vacant. The phenomenon is vacant and little studied in the economic reason our paper makes an analysis of the global to the particular generating tools that allow the study of this phenomenon more in detail. In addition to the theory of income and market research.Eje 2: Forma y estructura urbana, organización del territorio, orientación del crecimiento.Facultad de Arquitectura y Urbanism

Regulon-Specific Control of Transcription Elongation across the Yeast Genome

Transcription elongation by RNA polymerase II was often considered an invariant non-regulated process. However, genome-wide studies have shown that transcriptional pausing during elongation is a frequent phenomenon in tightly-regulated metazoan genes. Using a combination of ChIP-on-chip and genomic run-on approaches, we found that the proportion of transcriptionally active RNA polymerase II (active versus total) present throughout the yeast genome is characteristic of some functional gene classes, like those related to ribosomes and mitochondria. This proportion also responds to regulatory stimuli mediated by protein kinase A and, in relation to cytosolic ribosomal-protein genes, it is mediated by the silencing domain of Rap1. We found that this inactive form of RNA polymerase II, which accumulates along the full length of ribosomal protein genes, is phosphorylated in the Ser5 residue of the CTD, but is hypophosphorylated in Ser2. Using the same experimental approach, we show that the in vivo–depletion of FACT, a chromatin-related elongation factor, also produces a regulon-specific effect on the expression of the yeast genome. This work demonstrates that the regulation of transcription elongation is a widespread, gene class–dependent phenomenon that also affects housekeeping genes

Past and recent effects of livestock activity on the genetic diversity and population structure of native guanaco populations of arid patagonia

Extensive livestock production and urbanization entail modifications of natural landscapes, including installation of fences, development of agriculture, urbanization of natural areas, and construction of roads and infrastructure that, together, impact native fauna. Here, we evaluate the diversity and genetic structure of endemic guanacos (Lama guanicoe) of the Monte and Patagonian Steppe of central Argentina, which have been reduced and displaced by sheep ranching and other impacts of human activities. Analyses of genetic variation of microsatellite loci and d-loop revealed high levels of genetic variation and latitudinal segregation of mitochondrial haplotypes. There were indications of at least two historical populations in the Monte and the Patagonian Steppe based on shared haplotypes and shared demographic history among localities. Currently, guanacos are structured into three groups that were probably reconnected relatively recently, possibly facilitated by a reduction of sheep and livestock in recent decades and a recovery of the guanaco populations. These results provide evidence of the genetic effects of livestock activity and urbanization on wild herbivore populations, which were possibly exacerbated by an arid environment with limited productive areas. The results highlight the importance of enacting conservation management plans to ensure the persistence of ancestral and ecologically functional populations of guanacos.Fil: Mesas, Andrés. Universidad del Bio Bio; ChileFil: Baldi, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. South American Camelids Specialist Group; Chile. Wildlife Conservation Society; ArgentinaFil: González, Benito A.. South American Camelids Specialist Group; Chile. Universidad de Chile; ChileFil: Burgi, Maria Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. South American Camelids Specialist Group; Chile. Wildlife Conservation Society; ArgentinaFil: Chávez, Alexandra. Universidad del Bio Bio; ChileFil: Johnson, Warren E.. Smithsonian Conservation Biology Institute; Estados UnidosFil: Marín, Juan C.. Universidad del Bio Bio; Chil

Sertolinoma maligno en un canino criptórquido con hiperplasia prostática benigna quística: reporte de caso

The case of an 8-year-old Beagle canine, who was attended at the ASMEVET veterinary hospital in the city of Tunja, Colombia, is presented. The owner reported that in recent months he has been losing hair, has increased water consumption, has not been neutered, and more recently is depressed, lack of appetite and with signs of dysuria. On physical examination, generalized alopecia and gynecomastia were observed, and the prostate was enlarged and asymmetric. Transabdominal ultrasonography revealed an enlarged prostate, with heteroechogenic parenchyma and microcysts, and the testicles were retained at the level of the apex of the bladder. Enrofloxacin was administered for 5 days, and meloxicam for 4 days, and then the patient underwent celiotomy to remove the retained testicles. The histopathological study reported malignant sertolinoma. Fine needle aspiration of prostate tissue revealed cells consistent with benign prostatic hyperplasia. After 90 days of bilateral orchiectomy, remission of alopecia was observed and ultrasound evaluation showed a decrease in the size of the prostate.Se presenta el caso de un canino de 8 años, raza Beagle, que fue atendido en el hospital veterinario ASMEVET de la ciudad de Tunja, Colombia. El propietario informó que en los últimos meses ha estado perdiendo, ha aumentado el consumo de agua, no ha sido castrado, y que recientemente se encuentra deprimido, inapetente y con signos de disuria. Al examen físico se observa alopecia generalizada y ginecomastia, y la próstata se encuentra aumentada de tamaño y asimétrica. La ultrasonografía transabdominal revela próstata aumentada de tamaño, con parénquima heteroecogénico y microquistes, y los testículos se encontraban retenidos a la altura del vértice de la vejiga. Se administró enrofloxacina por 5 días, y meloxicam por 4 días, y luego se sometió a celiotomía para extirpar los testículos retenidos. El estudio histopatológico reportó sertolinoma maligno. La muestra del tejido prostático mediante aspiración con aguja fina reveló células compatibles con hiperplasia prostática benigna. Después de los 90 días de la orquiectomía bilateral se observó la remisión de la alopecia y la ecografía control mostró disminución del tamaño de la próstata

Extracción de un cuerpo extraño en esófago torácico mediante esofagotomía en un canino: Reporte de caso

The case of a 22-month-old female canine, Bernese Mountain breed, treated at the AsMeVet veterinary hospital in the city of Tunja, Colombia, diagnosed with partial esophageal obstruction is presented. The owner reported that the patient ate a pig bone the day before, of which she vomited several pieces, but she ate them again. However, from that time on she did not eat again but she drank water normally. On clinical examination, he is found to be depressed, dehydrated, and reluctant to eat. The chest X-ray revealed a radiopaque foreign body between the seventh and ninth rib. A left caudal lateral thoracotomy was performed to remove the bone by esophagotomy. The patient was medical discharged 72 hours after surgery.Se presenta el caso de una hembra canina de 22 meses de edad, raza Bernés de la Montaña, atendida en el hospital veterinario AsMeVet de la ciudad de Tunja, Colombia, a la cual se le diagnosticó una obstrucción parcial esofágica. La propietaria reportó que la paciente comió un hueso de cerdo el día anterior, del cual vomitó varios pedazos que los volvió a ingerir. De allí en adelante no volvió a comer, pero bebía agua con normalidad. Al examen clínico se encuentra depresión, deshidratación y renuencia a comer. En la radiografía de tórax se observó un cuerpo extraño radiopaco entre la séptima y novena costilla. Se realizó una toracotomía lateral caudal izquierda para extraer el hueso mediante esofagotomía. Se le dio de alta médica a la paciente a las 72 horas de la cirugía