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Avaliação da influência de tensoativos na pele de muda de cobra (Bothrops jararaca e Spilotis pullatus) por espectroscopia fatoacústica no infravermelho, calorimetria exploratória diferencial e espectroscopia Raman; Evaluation of the influence of surfactants on the stratum corneum of shed snake skin (Bothrops jararaca and Spilotis pullatus) by photoacoustic spectroscopy, differential scanning calorimetry and Raman spectroscopy

Lacerda, Aurea Cristina Lemos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 29/07/2004 PT
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A influência dos tensoativos lauril sulfato de sódio, cloreto de cetil trimetil amônio e álcool láurico etoxilado com 12 moles de óxido de etileno sobre o stratum corneum da pele de muda das cobras Bothrops jararaca e Spilotis pullatus foi avaliada através das técnicas biofísicas de PAS-FTIR, FT-Raman e DSC. Foram utilizadas soluções dos tensoativos em concentrações acima e abaixo da cmc e tratamentos por 4 e 8 horas (stratum corneum íntegro) e por 12 horas (stratum corneum após a remoção mecânica das camadas superficiais de células com fita adesiva). A presença do lauril sulfato de sódio e do cloreto de cetil trimetilamônio no stratum corneum foi detectada e a principal alteração observada para ambos foi o aumento do conteúdo hídrico do tecido; o álcool láurico etoxilado com 12 moles de óxido de etileno não promoveu aumento do conteúdo hídrico, apresentando ação de extração de lipídeos. A remoção mecânica das camadas superficiais de células com fita adesiva mostrou ser um procedimento útil para tratamento do stratum corneum da pele de muda de cobra, tornando a membrana mais adequada para estudos da ação de promotores de permeação.; The influence of the surfactants sodium lauryl sulfate...

Um sistema BASIC multiusuario para o COBRA-400

Maria Tereza Azevedo Cetolo
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em /11/1980 PT
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Neste trabalho é descrita a implementação de um sistema multi usuário ("Time sharing") em torno da linguagem BASIC escrito em linguagem de montagem do Intel 8080. São elaboradas as modificações no interpretador para torná-lo reentrante as estruturas de dados para compartilhamento de memória, o sistema de escalonamento do processador e as rotinas de Entrada/Saída para interface com o "hardware" e com o sistema de arquivos do COBRA 400; This paper describes an implementation of a BASIC time-sharing system an a COBRA-400. The system was developed starting from a BASIC Interpreter written in Intel 8080 Assembly/language. We describe the changes in the interpreter in order to make it reentrant, the data structures for sharing memory among user processes and the scheduler organization. Input/Output / routines were also rewritten for compatibility with the COBRA-400 hardware and file system

The photodynamic action of UV sensitized methylene blue on the venom of Thailand cobra Naja siamensis

GAWADE,S. P.
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2000 EN
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The photodynamic action of UV sensitized methylene blue (MB) was studied on the venom of Thailand cobra Naja siamensis. The reaction mixture comprising phosphate buffer (B), methylene blue (S), and venom protein (P) was exposed to UVR (ultra violet radiation) for 2 hours at 37°C. Stable excited species (S’) were generated by photodynamic action. These in B environment produced reduced substates SH2 and photooxidised products PO in the presence of atmospheric oxygen. Increased absorbance (OD) of the reaction mixture after UVR with a corresponding loss of protein was suggested to be due to the formation of photooxidised venom products. The detoxification profile of venom protein using visible radiation in the presence of MB and oxygen appeared similar to the profile using UVR.

IN VITRO ACTION OF COBRA VENOM ON GOAT SPERMATOZOA ULTRASTRUCTURE BY TRANSMISSION AND SCANNING ELECTRON MICROSCOPY

RAHMY,T. R.; AYOUB,M. A.
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2002 EN
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Goat spermatozoa were incubated in vitro in Tris-citrate buffer, pH 7.2, containing 0, 40, 80, or 160 mug of Naja haje venom/mL buffer for 4 hours. During incubation, the percentages of sperm motility were decreased, while percentages of dead spermatozoa were increased in a time and concentration-dependent manner. The effect of venom concentrations on the ultrastructure of incubated spermatozoa was examined hourly by scanning (SEM) and transmission (TEM) electron microscopy. SEM results showed plasma membrane wrinkling at heads of some spermatozoa after 2 h incubation with 40mug venom. Most spermatozoa suffered membrane wrinkling after 4 h incubation. However, incubation with 80 mug venom caused membrane fractures in most sperm heads after 1 h incubation. The extent and depth of these fractures were increased after 2-3 h incubation. After 4 h incubation, plasma membrane focal erosion of many spermatozoa heads was common. Incubation with 160 mg venom induced sperm head swollen plasma membranes after 1 h incubation. Ruptured and disintegrated membranes were seen after 2 h; lysis and removal of external surface of spermatozoa head plasma membranes were recorded after 3-4 h incubation. TEM indicated slightly swollen areas on the sperm head plasma membrane...

Restoration of adenosine deaminase, histamine, and IgE in organs of mice injected with cobra venom followed by specific treatment and reversal period

Lipps,B. V.
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2003 EN
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Adenosine deaminase (ADA), histamine, and IgE are endogenously present in animals. Research from this laboratory reported decreased levels of these substances in organs of mice as a consequence of sub-lethal injection of Naja kaouthia venom. This research reports that decreased ADA, histamine, and IgE levels were prevented by specific treatment and prolonged recovery periods. Adult Balb/c mice injected IM with sub-lethal venom dose were divided into five groups. Group 1 were injected with PBS; Group 2 with anti-cobra venom; and Group 3 with lethal toxin neutralizing factor (LTNF). Groups 4 and 5 were treated with IM or oral synthetic LT-10. After 24 hours, mice were sacrificed and organ homogenates were assayed for ADA, histamine, and IgE. Group 1 showed substantial reduction in levels of these substances. It was revealed that decreased levels were prevented by treatment with anti-cobra venom, LTNF, and LT-10. In a second series of experiments, venom-injected mice were sacrificed after 3, 7, and 10 days and organs assayed for ADA, histamine, and IgE levels. The recovery period to homeostasis for ADA, histamine, and IgE was 7 to 10 days.

Immunohistochemical investigation of neuronal injury in cerebral cortex of cobra-envenomed rats

Rahmy,T.R.; Hassona,I.A.
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2004 EN
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37.04%
The immunohistochemical expression of neuron-specific enolase, NSE (a cytoplasmic glycolytic enzyme of the neurons), synaptophysin, SYN (a major membrane glycoprotein of synaptic vesicles), and Bcl-2 (anti-apoptotic protein) were determined in cerebral cortex of rats envenomed with neurotoxic venom from Egyptian cobra. Male rats were intramuscularly (IM) injected with a single injection of either physiological saline solution or ½ LD50 or LD50 of cobra venom and sacrificed 24, 48, or 72 hr after envenoming. Formalin-fixed paraffin sections were immunohistochemically studied by avidin-biotin-peroxidase complex method. Neuron histological structure and isolation of genomic DNA were also detected. The results showed a dose and time-dependent increase in NSE and SYN immunoreactivity in cerebral cortex of envenomed rats except in 72 hr high dose envenoming, where decreased SYN was observed. On the other hand, low dose venom induced high Bcl-2 expression 24 hr after envenoming, while the high dose decreased Bcl-2 protein expression. Temporal and spatial Bcl-2 expression was accompanied by DNA fragmentation in cerebral cortex of all envenomed rats, although no serious histological alterations were noticed. These results suggest that cobra venom may lead to neuronal injury and impairment of axonal transport as ascertained by alterations in NSE and SYN immunoreactivity. It could also indicate that venom alters the molecular machinery of apoptosis by inhibiting Bcl-2 expression; however...

Biochemical and morphological analysis of cell death induced by Egyptian cobra (Naja haje) venom on cultured cells

Omran,M. A. A.; Fabb,S. A.; Dickson,G.
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2004 EN
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We investigated the in vitro process of cell death caused by Egyptian cobra venom on primary human embryonic kidney (293T) and mouse myoblast (C2C12) cell lines. The aim of these studies was to provide further information about triggering cell death, and suggest methods for eliminating unwanted cells, such as tumour cells. Both cell lines were treated with 10, 20, and 50 m g/ml of Egyptian cobra (Naja haje) venom in serum free media (SFM) and incubated for 8 hours. Total activities of the lactate dehydrogenase (LDH) and creatine kinase (CK) released in the culture during venom incubation were used as an indicator of the venom in vitro cytotoxicity. Cell injury was morphologically recognized and apoptosis determined by a Fluorescing Apoptosis Detection System and confirmed by staining nuclear DNA with DAPI. Our data clearly demonstrated marked cytotoxic effects and acute cell injury for both cell lines. Release of LDH and CK into the culture media induced by the venom correlates well with the morphological changes and extent of cell death. Mostly, these consequences were time and dose-dependent in both cell lines. The results obtained from this study indicated that cobra venom cause cell death by two different mechanisms: necrosis and induction of apoptosis. The apoptotic mechanism...

Consecutive bites on two persons by the same cobra: a case report

Amin,MR; Mamun,SMH; Chowdhury,NH; Rahman,M; Ghose,A; Al Hasan,A; Faiz,MA
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2008 EN
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In tropical countries like Bangladesh, persons are bitten by snakes every day and a considerable number of patients die en route to the hospital. An event of consecutive neurotoxic bites on two men by a single snake was observed in the Snake Bite Study Clinic (SBSC) of the Chittagong Medical College Hospital (CMCH). Two brothers, working in their semi-pucca restaurant, were successively bitten by the same cobra on their lower limbs. Within an hour, they were taken to the CMCH. Few minutes after admission, both developed symptoms of neurotoxicity: ptosis, nasal voice, dysphagia, broken neck sign, etc. They received polyvalent antivenom (Haffkine Bio-Pharmaceuticals Company, India) and other auxiliary treatment immediately. Within few hours, neurotoxic features were completely absent. Later, the snake was captured in the restaurant kitchen and identified as monocellate cobra (Naja kauthia) by the SBSC. The elder brother developed significant antivenom reactions and both presented necrosis and ulceration at the bite sites. In these cases, immediate arrival to the hospital and early administration of antivenom resulted in successful recoveries.

Purification and antibacterial activities of an L-amino acid oxidase from king cobra (Ophiophagus hannah) venom

Phua,CS; Vejayan,J; Ambu,S; Ponnudurai,G; Gorajana,A
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2012 EN
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Some constituents of snake venom have been found to display a variety of biological activities. The antibacterial property of snake venom, in particular, has gathered increasing scientific interest due to antibiotic resistance. In the present study, king cobra venom was screened against three strains of Staphylococcus aureus [including methicillin-resistant Staphylococcus aureus (MRSA)], three other species of gram-positive bacteria and six gram-negative bacteria. King cobra venom was active against all the 12 bacteria tested, and was most effective against Staphylococcus spp. (S. aureus and S. epidermidis). Subsequently, an antibacterial protein from king cobra venom was purified by gel filtration, anion exchange and heparin chromatography. Mass spectrometry analysis confirmed that the protein was king cobra L-amino acid oxidase (Oh-LAAO). SDS-PAGE showed that the protein has an estimated molecular weight of 68 kDa and 70 kDa under reducing and non-reducing conditions, respectively. The minimum inhibitory concentrations (MIC) of Oh-LAAO for all the 12 bacteria were obtained using radial diffusion assay method. Oh-LAAO had the lowest MIC value of 7.5 µg/mL against S. aureus ATCC 25923 and ATCC 29213, MRSA ATCC 43300, and S. epidermidis ATCC 12228. Therefore...

LWR core thermal-hydraulic analysis : assessment and comparison of the range of applicability of the codes COBRA IIIC/MIT and COBRA IV-I

Kelly, J. E.; Loomis, James N.; Wolf, Lothar
Fonte: MIT Energy Laboratory Publicador: MIT Energy Laboratory
Tipo: Relatório Formato: 7751688 bytes; application/pdf
EN_US
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This report summarizes the result of studies concerning the range of applicability of two subchannel codes for a variety of thermal-hydraulic analyses. The subchannel codes used include COBRA IIIC/MIT and the newly developed code, COBRA IV-I which is considered the benchmark code for the purpose of this report. Hence, through the comparisons of the two codes, the applicability of COBRA IIIC/MIT is assessed with respect to COBRA IV-I. A variety of LWR thermal-hydraulic analyses are examined. Results of both codes for steady-state and transient analyses are compared. The types of analysis include BWR bundle-wide analysis, a simulated rod ejection and loss of flow transients for a PWR. The system parameters were changed drastically to reach extreme coolant conditions, thereby establishing upper limits. In addition to these cases, both codes are compared to experimental data including measured coolant exit temperatures in a core, interbundle mixing for inlet flow upset cases and two-subchannel flow blockage measurements. The comparisons showed that, overall, COBRA IIIC/MIT predicts most thermal-hydraulic parameters quite satisfactorily. However, the clad temperature predictions differ from those calculated by COBRA IV-I and appear to be in error. These incorrect predictions are caused by the discontinuity in the heat transfer coefficient at the start of boiling. Hence...

Literatura feminina no início do século XX : o caso de Ercília Nogueira Cobra

Bechara Lapa, Alcina; Gonçalves Licari, Luzilá (Orientador)
Fonte: Universidade Federal de Pernambuco Publicador: Universidade Federal de Pernambuco
Tipo: Outros
PT_BR
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Visamos a analisar, na presente pesquisa, as obras de Ercília Nogueira Cobra, escritora e pensadora que viveu na virada do século XIX e defendeu, através de seus dois livros Virgindade Inutil Novela de Uma Revoltada (romance) e Virgindade Anti-Higiênica Preconceitos e Convenções Hipócritas (ensaio), baseada numa proposta pedagógica, uma nova maneira de olhar e educar as mulheres para a sua realização profissional e sexual. Pelos títulos já se tem uma idéia do escandâlo que eles provocaram no início do século XX, numa sociedade repressora e conservadora em que a mulher não tinha a menor visibilidade, tendo sua obra sido recolhida pela polícia, motivo pelo qual foi presa e cognominada de pornográfica

Clonagem, expressão e estudo de alguns cDNAs codificando proteínas estruturalmente relacionadas às alfa neurotoxinas da glândula de veneno da cobra coral Micrurus corallinus (Serpentes, Elapidae).; Cloning, expression and study of some cDNAs codifying proteins structurally related to the alpha neurotoxins of the venom gland from coral snake Micrurus corallinus (Serpentes, Elapidae).

Silva, Alvaro Rossan de Brandão Prieto da
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 28/01/2002 PT
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De uma biblioteca de cDNA da glândula de veneno da cobra coral brasileira Micrurus corallinus foi isolada uma seqüência denominada NXH8. Esta seqüência de cDNA apresenta similaridade estrutural com a família de toxinas de serpentes em 'três dígitos' ricas em pontes dissulfeto. A subclasse melhor conhecida nesta família, são as alfa neurotoxinas. Uma outra seqüência distinta, denominada NXH1 e suas isoformas NXH3 e NXH7, foram isoladas anteriormente. Pertencem à mesma família de toxinas e estão presentes na mesma biblioteca. Alguns resultados da caracterização de NXH1, são utilizados neste estudo, em comparação com NXH8. Algumas características estruturais tornam a seqüência NXH8 diferente da classe usual das alfa neurotoxinas, vindo a constituir possivelmente uma nova subclasse da família. A proteína NXH8 foi expressa em diversos vetores de expressão em Escherichia coli. A proteína recombinante, expressa pelo vetor pRSET C - NXH8 foi utilizada para imunizar camundongos. O soro contra NXH8, assim como o soro anti - elapídico do Instituto Butantan, reconhece a toxina recombinante em ELISA e Western blot. O soro anti - NXH8 detecta apenas uma banda do veneno de M. corallinus em Western blot, mas apresenta reatividade cruzada com componentes do veneno de alguns elapídeos neotropicais e do velho mundo. Em contraste...

Entre colegas no se cobra

Alegria Mera, Lina Fernanda
Fonte: Medicina Narrativa Publicador: Medicina Narrativa
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artículo Formato: application/pdf
SPA
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Debido a mi cirugía gástrica para bajar de peso he quedado con muchas comorbilidades, sobre todo con una anemia crónica que me tiene con muy poca energía, cansancio, sudoración, ortostatismo, entre otros tantos padecimientos. En la búsqueda de alguien que diera solución a mi problema, un amigo me recomendó un médico internista, profesor de la Facultad de Medicina de la Universidad del Cauca, muy prestigioso por cierto. Aproveché la estancia en mi casa en Popayán para acudir a tan nombrado médico. Preparándome para ahorrarle trabajo, con mis pocos conocimientos, le llevé un cuadro hemático que me tomé previamente con niveles de ferritina y tranferrina.

Cobra Judy II Conversion

Gregor, Jeffrey; Hootman, John; Price, David; Psillidas, Kostas; Whalen, Todd
Fonte: MIT - Massachusetts Institute of Technology Publicador: MIT - Massachusetts Institute of Technology
Formato: 1330168 bytes; application/pdf
EN_US
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The strategic community relies heavily on the Cobra Judy (CJ1) instrumentation to provide high-quality radar and telemetry data for ballistic missile system testing and development. The current CJ1 platform, USNS Observation Island (T-AGM 23), will be 50 years old in 2003, and the CJ1 system requires an upgrade in technology. This report investigates the feasibility of converting an existing ship to a Mobile Test Range Asset in order to field a platform carrying the Cobra Judy II (CJ2) system on a much newer ship. Based on a review of available hull forms and prior research, the Henry J. Kaiser class oiler (T-AO 187) was found to be the most suitable conversion candidate. All equipment pertaining to underway replenishment (UNREP) was removed and replaced with components of the CJ2 system. Additionally, systems to provide ballast and electrical power were evaluated and installed, as necessary. The Advanced Surface Ship Evaluation Tool (ASSET), Program of Ships Salvage and Engineering (POSSE), and Ship Wave Analysis (SWAN) software tools were used to evaluate the converted ship's general, structural/stability, and seakeeping characteristics, respectively. The MIT Cost Model was used to estimate conversion costs, excluding acquisition costs of CJ2 sensors. The following table summarizes the characteristics of the CJ2 ship conversion design. CJ2 Conversion Design Summary LBP 650 ft B 98 ft T 31 ft Full Load Displacement 35161 ltons KG 32.6 ft GMT/B 0.093 Max. Speed 20 knots Range 9300 nm (at 15 kts) Seakeeping Operable in Sea State 5 Conversion Cost 179 MDo; PMS 426...

Biochemical and toxinological characterization of Naja sumatrana (Equatorial spitting cobra) venom

Yap,MKK; Tan,NH; Fung,SY
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2011 EN
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The lethal and enzymatic activities of venom from Naja sumatrana (Equatorial spitting cobra) were determined and compared to venoms from three other Southeast Asian cobras (Naja sputatrix, Naja siamensis and Naja kaouthia). All four venoms exhibited the common characteristic enzymatic activities of Asiatic cobra venoms: low protease, phosphodiesterase, alkaline phosphomonoesterase and L-amino acid oxidase activities, moderately high acetylcholinesterase and hyaluronidase activities and high phospholipase A2. Fractionation of N. sumatrana venom by Resource® S cation exchange chromatography (GE Healthcare, USA) yielded nine major protein peaks, with all except the acidic protein peak being lethal to mice. Most of the protein peaks exhibit enzymatic activities, and L-amino acid oxidase, alkaline phosphomonoesterase, acetylcholinesterase, 5'-nucleotidase and hyaluronidase exist in multiple forms. Comparison of the Resource® S chromatograms of the four cobra venoms clearly indicates that the protein composition of N. sumatrana venom is distinct from venoms of the other two spitting cobras, N. sputatrix (Javan spitting cobra) and N. siamensis (Indochinese spitting cobra). The results support the revised systematics of the Asiatic cobra based on multivariate analysis of morphological characters. The three spitting cobra venoms exhibit two common features: the presence of basic...

The COBRA demonstrator at the LNGS underground laboratory

The COBRA collaboration; Ebert, J.; Fritts, M.; Gehre, D.; Gößling, C.; Göpfert, T.; Hagner, C.; Heidrich, N.; Klingenberg, R.; Köttig, T.; Kröninger, K.; Michel, T.; Neddermann, T.; Nitsch, C.; Oldorf, C.; Quante, T.; Rajek, S.; Rebber, H.; Reinecke
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
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The COBRA demonstrator, a prototype for a large-scale experiment searching for neutrinoless double beta-decay, was built at the underground laboratory Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It consists of an array of 64 monolithic, calorimetric CdZnTe semiconductor detectors with a coplanar-grid design and a total mass of 380g. It is used to investigate the experimental challenges faced when operating CdZnTe detectors in low-background mode, to identify potential background sources and to show the long-term stability of the detectors. The first data-taking period started in 2011 with a subset of the detectors, while the demonstrator was completed in November 2013. To date, more than 250kg d of data have been collected. This paper describes technical details of the experimental setup and the hardware components.; Comment: 8 pages, 10 figures, submitted to NIM A

First results on double beta decay modes of Cd, Te and Zn isotopes with the COBRA experiment

The COBRA collaboration; Bloxham, T.; Boston, A.; Dawson, J.; Dobos, D.; Fox, S. P.; Freer, M.; Fulton, B. R.; Gößling, C.; Harrison, P. F.; Junker, M.; Kiel, H.; McGrath, J.; Morgan, B.; Münstermann, D.; Nolan, P.; Oehl, S.; Ramachers, Y.; Reeve, C.;
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 18/07/2007
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Four 1cm^3 CdZnTe semiconductor detectors were operated in the Gran Sasso National Laboratory to explore the feasibility of such devices for double beta decay searches as proposed for the COBRA experiment. The research involved background studies accompanied by measurements of energy resolution performed at the surface. Energy resolutions sufficient to reduce the contribution of two-neutrino double beta decay events to a negligible level for a large scale experiment have already been achieved and further improvements are expected. Using activity measurements of contaminants in all construction materials a background model was developed with the help of Monte Carlo simulations and major background sources were identified. A total exposure of 4.34 kg.days of underground data has been accumulated allowing a search for neutrinoless double beta decay modes of seven isotopes found in CdZnTe. Half-life limits (90% C.L.) are presented for decays to ground and excited states. Four improved lower limits have been obtained, including zero neutrino double electron capture transitions of Zn64 and Te120 to the ground state, which are 1.19*10^{17} years and 2.68*10^{15} years respectively.; Comment: 8 pages, 7 figures

Developing Engineering Model Cobra fiber positioners for the Subaru Telescope Prime Focus Spectrometer

Fisher, Charles; Morantz, Chaz; Braun, David; Seiffert, Michael; Aghazarian, Hrand; Partos, Eamon; King, Matthew; Hovland, Larry; Schwochert, Mark; Kaluzny, Joel; Capocasale, Christopher; Houck, Andrew; Gross, Johannes; Reiley, Dan; Mao, Peter; Riddle, Re
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 12/08/2014
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The Cobra fiber positioner is being developed by the California Institute of Technology (CIT) and the Jet Propulsion Laboratory (JPL) for the Prime Focus Spectrograph (PFS) instrument that will be installed at the Subaru Telescope on Mauna Kea, Hawaii. PFS is a fiber fed multi-object spectrometer that uses an array of Cobra fiber positioners to rapidly reconfigure 2394 optical fibers at the prime focus of the Subaru Telescope that are capable of positioning a fiber to within 5um of a specified target location. A single Cobra fiber positioner measures 7.7mm in diameter and is 115mm tall. The Cobra fiber positioner uses two piezo-electric rotary motors to move a fiber optic anywhere in a 9.5mm diameter patrol area. In preparation for full-scale production of 2550 Cobra positioners an Engineering Model (EM) version was developed, built and tested to validate the design, reduce manufacturing costs, and improve system reliability. The EM leveraged the previously developed prototype versions of the Cobra fiber positioner. The requirements, design, assembly techniques, development testing, design qualification and performance evaluation of EM Cobra fiber positioners are described here. Also discussed is the use of the EM build and test campaign to validate the plans for full-scale production of 2550 Cobra fiber positioners scheduled to begin in late-2014.

A cobra-de-duas-cabeças na percepção dos moradores do povoado de Itatiaia, Minas Gerais

Mateus, Michelle Barbosa; Universidade Federal de Ouro Preto; Pinto, Lorena Cristina Lana; Universidade Federal de Ouro Preto; de Moura, Mário Ribeiro; Universidade Federal de Viçosa; Pires, Maria Rita Silvério; Universidade Federal de Ouro Preto
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 14/06/2011 POR
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http://dx.doi.org/10.5007/2175-7925.2011v24n3p111Os anfisbenídeos são répteis Squamata de hábito fossorial, conhecidos popularmente como cobra-de-duas-cabeças. São animais pouco conhecidos no meio urbano, embora sejam presentes no cotidiano da população rural. Com o objetivo de registrar o conhecimento popular, bem como lendas e crendices relativas a estes animais, desenvolveu-se um estudo etnobiológico no povoado de Itatiaia, Minas Gerais.  Aspectos ecológicos e biológicos dos anfisbenídeos foram abordados em entrevistas semi-estruturadas aplicadas a 48 moradores do povoado, entre os meses de abril a novembro de 2009. Foram entrevistados apenas os indivíduos que permitiram acesso aos seus conhecimentos e crenças. Os dados foram analisados segundo o modelo de união das diversas competências individuais. De acordo com o número de moradores que foram entrevistados, é possível afirmar que a população classifica os anfisbenídeos como serpentes, os consideram como animais perigosos, favorecendo a morte desses sempre que encontrados. A etnozoologia pode ser utilizada como uma importante ferramenta para se obter informações sobre os anfisbenídeos e, se associada a atividades educativas, pode também contribuir para a conservação destes animais.

Predação da cobra d’água Helicops infrataeniatus (Serpentes, Colubridae) pela maria-faceira Syrigma sibilatrix (Aves, Ardeidae) no sul do Brasil.; .

Franz, Ismael; Laboratório de Zoologia, Centro Universitário Feevale; Ghizoni-Jr, Ivo Rohling; Associação Montanha Viva – Florianópolis – SC; Albuquerque, Jorge Luiz Berger; Associação Montanha Viva – Florianópolis – SC; Barcellos, André;
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/01/2007 POR
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È relatado um evento de predação da cobra d’água (Helicops infrataeniatus) pela maria-faceira (Syrigma sibilatrix) em área úmida (açude de pouca profundidade com vegetação aquática) no estado de Santa Catarina, sul do Brasil. Tal item da dieta da maria-faceira ainda não havia sido reportado pela literatura.; Predation of the water snake Helicops infrataeniatus (Serpentes, Colubridae) by the Whistling Heron Syrigma sibilatrix (Aves, Ardeidae) in southern Brazil. In this work, we describe the predation of the water snake (Helicops infrataeniatus) by the Whistling Heron (Syrigma sibilatrix) in a wetland of Santa Catarina state, southern Brazil. This particular item of the Whistling Heron diet had not been reported previously in the scientific literature.