Falcon Research Articles

Investigation of the dose enhancement effect due to gold nanoparticles at 18 MV radiotherapy using MAGIC-f and Monte Carlo methods Thoraco-Lumbar spinal cord fMRI in 3T Magnetic field

Introduction: Normoxic MAGIC-f polymer gels are established dosimeters used for three dimensional dos uantifications in radiotherapy. The high atomic number nanoparticles such as gold are nov adiosensitizers used to enhance doses delivered to tumors. The aim of this study was t vestigate the effect of gold nanoparticles (GNPs) in enhancing percentage depth doses (PDD ithin the MAGIC-f gel exposed to linac high energy photon beams (18MV). Materials and methods: The MAGIC-f gel was fabricated based on its standard composition with some modifications an oured into falcon tubes. The PDDs in the tubes containing the gel were calculated using a commo onte Carlo code (MCNPX) followed by experimental verifications. Then, the GNPs with a verage diameter of 15 nm and a concentration of 0.1 mM were embedded in the gel, poured int milar falcon tubes and irradiated to 18 MV beams of a Varian 2100 linac. Finally, simila xperimental and Monte Carlo (MC) calculations were conducted to determine the effect of usin e GNPs on some dosimetric parameters of interest. Results: The results of experimental measurements and simulated MC calculations showed a dos nhancement factor (DEF) of 1.12±0.07 and 1.13±0.06 respectively due to the use of the GNP hen exposed to 18 MV linac energies. Conclusion: The results indicated that the fabricated MAGIC-f gel could be recommended as a suitable tool fo ree dimensional dosimetric investigations at high energy radiotherapy procedures wherein th NPs are used.

Análisis Epidemiológico de la anisakiasis y sus vinculaciones económicas y familiares en Venezuela y Latinoamérica

Recibido: 17 de mayo del 2018Aprobado: 19 de junio del 2018Para evaluar la situación epidemiológica de la enfermedad parasitaria “anisakiasis” a nivel mundial, en Latinoamérica y en Venezuela, través de la prevalencia de parásitos de la familia Anisakidae, en peces capturados en la costa occidental del Istmo de Médanos, estado Falcón, el efecto de la situación económica del país, así como, de las condiciones de las familias de los pescadores, habitantes del sector Pantano Abajo, municipio Miranda de Coro, quienes hacen frente a una situación de riesgo sanitario inminente. Se realizó una investigación descriptiva documental. Se encontró: alta prevalencia del parásito anisakis en el caribe venezolano y colombiano; la situación económica del país condiciona la explotación de pesquería artesanal asociada comercio informal en deplorables condiciones higiénico sanitarias, elevando el riesgo de: pescadores, su familia y consumidores a exponerse a la infestación.Probablementepescadores y consumidores sean huéspedes accidentales del parásito, por no contar recursos económicos que dificultan niveles de prevención.

Falcon fidelity and a fluke discovery

Falcon fidelity and a fluke discovery

Peregrine falcon egg pollutants: Mirror Stockholm POPs list including methylmercury

The role of the peregrine falcon (Falco peregrinus) as a bioindicator for the accumulation of organohalogen compounds and other persistent organic pollutants has been established in field studies. Biometric indices for damage caused by pollutants such as the shell thickness and the shell index were determined and the egg contents were analyzed for various pollutants by gas chromatography/mass spectrometry. A wide range of chemically activated luciferase expression (CALUX®) bioassays were performed on subsamples of the eggs.The following organohalogen compounds were found in the eggs of 2009: dichlorodiphenyltrichloroethane (DDT) and dichlorodiphenyldichloroethane, heptachlor epoxide, hexachlorobenzene, dieldrin, hexachlorocyclohexane, polychlorobiphenyls and polychlorodibenzodioxins and polychlorodibenzofurans, polybromodiphenyl ethers, hexabromocyclododecane, tetrabromobisphenyl A, perfluoro compounds, and mercury. The DDT metabolite, dichlorodiphenyldichloroethene (DDE) (11,800 ng/g dry matter),...

Freeing the Land, Rebuilding Our Movements: Reflections on the Legacies of Chokwe Lumumba and Luis Nieves Falcon

Freeing the Land, Rebuilding Our Movements: Reflections on the Legacies of Chokwe Lumumba and Luis Nieves Falcon

Jean Falcon (1491-1541), a great surgeon and anatomist of the 16th century.

Jean Falcon, an Aragon native, became a famous surgeon at the Faculty of Montpellier. He was a Royal physician, wealthy enough to live a luxurious life and treat influential patients. His lectures were legendary, and his works gave him fame among the surgeons' class. Of all his manuscripts stands the "Guidon", which became an anatomical surgeons' handbook, worthy of reference from the scientific community for centuries.

Morphological studies of the stomach of falcon

A morphological study of the stomach of the falcon was carried out, grossly and under light microscopy. Anatomically, the stomach of the falcon is constituted by two externally distinguishable chambers: a cranial chamber, the proventriculus ( pars glandularis ), which is cranially connected to the esophagus and caudally, to the gizzard ( ventriculus or pars muscularis ). There is no papilla on the gastric epithelium surface of the proventricular. Both, the mucous tunic of the proventriculus and of the gizzard present folds lined by simple columnar epithelium. The tunica mucosa of the proventriculus is extensively folded due to the presence of well-developed longitudinal muscle bundles. There is no intermediate zone (isthmus) between the proventriculus and the gizzard. The luminal surface of the ventriculus have cuticle, which is sloughed and shed small fine area (around the pyloric opening) and very thin membrane and highly closely adherent to the lining surface of gizzard.

SP-0407: Update on FALCON

SP-0407: Update on FALCON

Anatomy and art.

Leonardo da Vinci, Jean Falcon, Andreas Vesalius, Henry Gray, Henry Vandyke Carter and Frank Netter created some of the best atlases of anatomy. Their works constitute not only scientific medical projects but also masterpieces of art.

The meeting of Hadji Bektash and Hadji Toghrul: Appearance in a pigeon and a falcon form

The meeting of Hadji Bektash and Hadji Toghrul: Appearance in a pigeon and a falcon form

Proteolytic response of Zea mays L. hybrids to citric acid treatment.

Hybrids of Zea mays L. (Buffalo, Falcon, H360 y HV313) were treated with citric acid (2000 ppm). The gr ain yield, the soluble protein and the proteolytic activity were monitored in the physiological maturity stage of the crop. The citric acid was applied before the appearance of the flag leaf, induced an increase in the production of the grain from 540 to 945 kg·ha -1 , in the soluble protein from 1.39 to 4.2 mg·mg d·w -1 and into the proteolytic activity from 2 to 12 times in the Falcon, H360 and HV313 hybrids, while the Buffalo hybrid responded with less intensity to the treatment with citric acid. In the H360 hybrid treated with citric acid, an increase in the proteolytic activity of aspartyl serine proteases was observed. The results indicate that citric acid induces differentially, the proteolytic activity and the vigor of the corn hybrids analyzed.

Palaeodiversity of Caribbean echinoids including new material from the Venezuelan Neogene

The extensive Venezuelan coastline is very important for understanding the evolution of the Caribbean marine fauna. We report new fossil material collected from three Neogene fossil sites in the Falcon Basin and present the first diversity analysis of the known fossil echinoids from Venezuela and other Caribbean regions. Five species are reported for the first time from Venezuela. Each of the three fossil sites shows a different taxonomic composition, which may be a consequence of differing palaeoecological conditions during the Neogene. Furthermore, the environmental changes caused by the closure of the Central American Isthmus may also have played a role. The analysis of the Venezuelan echinoid fossil record, including the new herein described material, reveals three major diversity decreases and a maximal diversity peak in the Middle Miocene instead of the Eocene as it is the case in other Caribbean echinoid faunas. The first diversity decrease at the end of the Early Cretaceous, recognised by a gap in the fossil record, unfolds new research potential. The second one, around the Eocene-Oligocene boundary, is interpreted as an extinction event, as has been recognized for other echinoid and invertebrate faunas throughout the Caribbean. In contrast to other Caribbean invertebrate faunas, the cause of the third diversity decrease of echinoids throughout the Caribbean appears to be the beginning, instead of the end, of the closure of the Central American Isthmus. Although Venezuela plays a special ecological role in the Caribbean due to its seasonal upwellings, this study provides (1) a basis to better understand the fossil Venezuelan echinoid fauna, (2) a contrast to other Caribbean regions, and (3) insights into the Caribbean echinoid evolutionary patterns.

Nueva especie de <i>Mastigoproctus</i> Pocock, 1894 (Thelyphonida, Thelyphonidae) de Venezuela noroccidental

Una nueva especie del genero Mastigoproctus Pocock, 1894 es descrita para el estado Falcon, en el tramo occidental de la Cordillera de la Costa, Venezuela. Es la tercera especie del genero registrada para el pais, siendo el registro mas al norte del genero en el continente suramericano y el primero del orden para el estado Falcon.

Change in the Winter Occurrence of Merlins at a Western Washington Estuary Following Recovery of Peregrine Falcon Populations

Resumen El riesgo potencial de la competencia o la depredacion por parte de individuos coespecificos o congeneres podria influenciar el comportamiento de las aves y moldear la estructura de las comunidades de rapaces. Compare la tasa de presencia de Falco columbarius en la ensenada de Totten, Washington, en dos periodos de tiempo: en la decada de 1980 (cuando F. peregrinus era una especie rara) y entre 1999 y 2005 (cuando la abundancia de F. peregrinus habia aumentado). Registre siete veces mas a F. columbarius en las visitas realizadas entre 1980 y 1988 que en las realizadas entre 1999 y 2005. En contraste, no vi ningun F. peregrinus entre 1980 y 1988, pero entre 1999 y 2005 observe a esta especie con una frecuencia un poco mayor en comparacion con la de F. columbarius en el mismo periodo. El cambio en la presencia de F. columbarius coincidio con un incremento en la abundancia de F. peregrinus. Propongo la hipotesis de que la presencia de F. peregrinus ha influenciado el comportamiento de F. columbarius,...

Summer Diet of the Peregrine Falcon in Faunistically Rich and Poor Zones of Arizona Analyzed with Capture-Recapture Modeling

AbstractWe collected prey remains from 25 Peregrine Falcon (Falco peregrinus) territories across Arizona from 1977 to 1988 yielding 58 eyrie-years of data. Along with 793 individual birds (107 species and six additional genera), we found seven mammals and nine insects. In addition, two nestling peregrines were consumed. We found a larger dependence upon White-throated Swifts (Aeronautes saxatalis) and birds on migration in northern Arizona, while in southeastern and central Arizona average prey mass was greater and columbiforms formed the largest dietary component. In northern, central, and southeastern Arizona, 74, 66, and 56 avian prey taxa, respectively, were recorded. We used capture-recapture modeling to estimate totals of 111 ± 9.5, 113 ± 10.5, and 86 ± 7.9 (SE) avian taxa taken in these same three areas. These values are counterintuitive inasmuch as the southeast has the richest avifauna. For the entire study area, 156 ± 9.3 avian taxa were estimated to be taken by peregrines.Dieta Estival de Falco peregrinus en Arizona Comparando Zonas Ricas y Pobres en Avifauna Mediante un Modelo de Captura-RecapturaResumen. Desde 1977 a 1988 colectamos restos de presas en 58 nidos de Falco peregrinus a través de Arizona. Conjuntamente con 793 aves individuales (107 especies y seis géneros adicionales), encontramos siete mamíferos y nueve insectos. Además, fueron consumidos dos pichones de Falco peregrinus. En la zona norte encontramos una mayor dependencia sobre Aeronautes saxatalis y aves en migración, mientras que en las zonas sureste y central la masa promedio de presa fue más grande y los columbiformes constituyeron el componente principal de la dieta de Falco peregrinus. En las zonas norte, central y sureste se registraron 74, 66 y 56 taxa de aves presa, respectivamente. Para estimar el número total de taxa capturados por Falco peregrinus usamos un modelo de captura-recaptura. Los valores calculados fueron 111 ± 9.5, 113 ± 10.5 y 86 ± 7.9 (EE) taxa para las zonas norte, central y sureste, respectivamente. Estos valores no reflejan los que esperábamos, ya que la zona sureste tuvo una avifauna más rica. Se estimó que 156 ± 9.3 taxa fueron capturados por Falco peregrinus en la totalidad del área de estudio.

Preliminary Report of a Parasitic Infection of the Brain and Eyes of a Peregrine Falcon Falco peregrinus and Nankeen Kestrels Falco cenchroides in Western Australia

"Preliminary Report of a Parasitic Infection of the Brain and Eyes of a Peregrine Falcon Falco peregrinus and Nankeen Kestrels Falco cenchroides in Western Australia." Emu - Austral Ornithology, 99(4), pp. 291–292

Validation of a Falcon Model with a Synthetic Ore

A synthetic feed was used to validate a model proposed for the Falcon batch concentrator, a centrifuge unit for gravity recovery. Tungsten was used to mimic gold content, magnetite for sulphides, and silica sand for silicates. The size distribution of the feed was kept constant, but magnetite content in the feed was varied from 0 to 20%.Test results validated the proposed model, and showed that an increase in the amount of magnetite in the feed caused a significant decrease in tungsten recovery, especially when the mass treated was increased. Fitting the model parameters showed that increasing magnetite content significantly increased the concentrate bed erosion rate constant, particularly for tungsten finer than 25 um, and slightly decreased the capture rate constant. © 1997 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved.RésuméNous avons utilisé une alimentation synthétique pour valider un modèle du Concentrateur Falcon en discontinu. La phase or a été remplacée par du tungstène, de même densité, et la phase sulfures par de la magnétite. Nous avons utilise du sable de quartz pour représenter la phase silicates. La granulométrie de chacune des phases a été maintenue constante, mais nous avons varié la teneur en magnétite de 0 à 20%.Les resultats experimentaux ont valide le modele, tout en demontrant qu'une augmentation de la teneur de magnetite dans l'alimentation fait baisser la recuperation de tung stene, surtout si une masse importante est traitee. Vne estimation des parametres du modele a etablie que la con stante cinetique d'erosion augmentait alors considerablement, surtout au-dessous de 25 pm; quant a elle, la constante cinetique de capture diminuait legerement.Les résultats expérimentaux ont validé le modèle, tout en démontrant qu'une augmentation de la teneur de magnétite dans l'alimentation fait baisser la récupération de tungstène, surtout si une masse importante est traitée. Une estimation des paramètres du modèle a établie que la constante cinétique d'érosion augmentait alors considérablement, surtout au-dessous de 25 μm; quant à elle, la constante cinétique de capture diminuait légèrement.

Return of the Falcons: Peregrine Falcon Populations . Their Management and Recovery. Tom J. Cade, James H. Enderson, Carl G. Thelander, and Ciayron M. White, Eds. The Peregrine Fund, Boise, ID, 1988. xviii, 949 pp., illus., + plates. $45. From a conference, Sacramento, CA, Nov. 1985.

Return of the Falcons: <i>Peregrine Falcon Populations</i> . Their Management and Recovery. Tom J. Cade, James H. Enderson, Carl G. Thelander, and Ciayron M. White, Eds. The Peregrine Fund, Boise, ID, 1988. xviii, 949 pp., illus., + plates. $45. From a conference, Sacramento, CA, Nov. 1985.

WHAT ROUGH BEAST: NEO-AFRICAN LITERATURE AND THE FORCE OF SOCIAL CHANGE

Turning and turning in the widening gyre The falcon cannot hear the falconer; Things fall apart; the centre cannot hold; Mere anarchy is loosed upon the world, The blood-dimmed tide is loosed, and everywhere 5 The ceremony of innocence is drowned; The best lack all conviction, while the worst Are full of passionate intensity. Surely some revelation is at hand; Surely the Second Coming is at hand. 10 The Second Coming! Hardly are those words out When a vast image out of Spiritus Mundi Troubles my sight: somewhere in sands of the desert A shape with lion body and the head of a man, A gaze blank and pitiless as the sun, 15 Is moving its slow thighs, while all about it Reel shadows of the indignant desert birds. The darkness drops again; but I know That twenty centuries of stony sleep Were vexed to nightmare by a rocking cradle, 20 And what rough beast, its hour come round at last, Slouches towards Bethlehem to be born? William Butler Yeats'

Fight for the falcon

Fight for the falcon