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Search Results: 1 - 10 of 703 matches for " Onanchi; Hanson "
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A fly larva (Syrphidae: Ocyptamus) that preys on adult flies
Ure?a,Onanchi; Hanson,Paul;
Revista de Biología Tropical , 2010,
Abstract: predatory syrphid larvae feed on relatively immobile prey, but here we report the first case (as far as we are aware) of obligatory predation on very mobile prey. larvae of an undescribed species of ocyptamus (diptera: syrphidae) were found in whitefly (hemiptera: aleyrodidae) aggregations on the undersides of citrus leaves. however, instead of preying on the whitefly nymphs (as would be expected), the larvae preyed on adult flies (diptera) that were attracted to the honeydew. in the laboratory, larvae captured significantly more flies on whitefly infested leaves than on washed leaves, and generally abandoned leaves that lacked whiteflies. most cases of successful prey capture involved flies that probed the anterior part of the larva’s body with its proboscis (as if it were honeydew). the syrphid larva lashed out at the fly and entangled it in sticky oral secretion. the prey did not recover when they were removed from the larva, suggesting that this new predatory species also employs venom to subdue its prey. although the larvae consumed some honeydew, they were unable to complete their development on this diet. two parasitoids were reared from ocyptamus puparia, proaspicera sp. (hymenoptera: figitidae) and paracarotomus sp. (hymenoptera: pteromalidae), both of which are endoparasitic koinobionts. rev. biol. trop. 58 (4): 1157-1163. epub 2010 december 01.
A fly larva (Syrphidae: Ocyptamus) that preys on adult flies
Onanchi Ure?a,Paul Hanson
Revista de Biología Tropical , 2010,
Abstract: Predatory syrphid larvae feed on relatively immobile prey, but here we report the first case (as far as we are aware) of obligatory predation on very mobile prey. Larvae of an undescribed species of Ocyptamus (Diptera: Syrphidae) were found in whitefly (Hemiptera: Aleyrodidae) aggregations on the undersides of citrus leaves. However, instead of preying on the whitefly nymphs (as would be expected), the larvae preyed on adult flies (Diptera) that were attracted to the honeydew. In the laboratory, larvae captured significantly more flies on whitefly infested leaves than on washed leaves, and generally abandoned leaves that lacked whiteflies. Most cases of successful prey capture involved flies that probed the anterior part of the larva’s body with its proboscis (as if it were honeydew). The syrphid larva lashed out at the fly and entangled it in sticky oral secretion. The prey did not recover when they were removed from the larva, suggesting that this new predatory species also employs venom to subdue its prey. Although the larvae consumed some honeydew, they were unable to complete their development on this diet. Two parasitoids were reared from Ocyptamus puparia, Proaspicera sp. (Hymenoptera: Figitidae) and Paracarotomus sp. (Hymenoptera: Pteromalidae), both of which are endoparasitic koinobionts. Rev. Biol. Trop. 58 (4): 1157-1163. Epub 2010 December 01. Las larvas depredadoras de Syrphidae se alimentan de presas relativamente inmóviles, pero aquí reportamos el primer caso (hasta ahora conocido) de la depredación obligatoria en presas muy móviles. Se encontraron las larvas de una especie no descrita de Ocyptamus (Diptera: Syrphidae) juntas con ninfas de mosca blanca (Hemiptera: Aleyrodidae) en el envés de las hojas de cítricos. Sin embargo, en vez de alimentarse de las ninfas de mosca blanca (como debería esperarse), las larvas se alimentaron de moscas adultas (Diptera) que fueron atraídas a las excreciones azucaradas de la mosca blanca. En el laboratorio, las larvas capturaron más moscas cuando estaban en hojas con mosca blanca que cuando estaban en hojas lavadas, y generalmente abandonaron las hojas sin mosca blanca. La mayoría de las capturas exitosas de presas ocurrieron cuando la mosca extendió su proboscis y tocó la parte anterior de la larva del sírfido. La larva regurgita hilos pegajosos en el momento de capturar una presa y presas removidas de la larva no recuperaron su movibilidad, lo cual sugiere que el depredador utiliza un veneno para inmovilizar la presa. Aunque las larvas se alimentaron de excreciones azucaradas de mosca blanca, no pudie
Learning about Vegetarian Diets in School: Curricular Representations of Food and Nutrients in Elementary Health Education  [PDF]
Clara Hanson
Advances in Applied Sociology (AASoci) , 2012, DOI: 10.4236/aasoci.2012.21010
Abstract: This paper examines the way non-meat and plant based diets are discussed in four elementary curricula. The author used an open coding technique of grounded theory to understand the way food, nutrition and vegetarianism was discussed. The curricula relied heavily upon the USDA Food Pyramid and a related concept of “balance” for nutritional information. The curricula also discussed nutrition in terms of food and food groups, rather than in terms of nutrients. Although some of the curricula included information about the benefits of vegetarian diets, the high level of use of the Food Pyramid often overwhelmed the low level of information about vegetarianism.
Trends in U.S. Voting Attitudes with a Consideration of Variation by Gender and Race/Ethnicity  [PDF]
Sandra L. Hanson
Open Journal of Political Science (OJPS) , 2016, DOI: 10.4236/ojps.2016.64038
Abstract: Low turnout rates and discussions of disaffected voters are receiving considerable attention as we approach the 2016 U.S. presidential elections. Do trends in American’s attitudes about voting and correlates of these attitudes (political involvement, efficacy, and social connectedness) confirm the pessimistic assessments and do voters across gender and race/ethnic groups think similarly? Data from the American National Election Studies (ANES) provide some reason for optimism. Trends over the past few presidential election periods show a majority of Americans intend to vote and this majority is increasing. Trends show increases or stability on numerous correlates of voting attitudes including political involvement and social connectedness. Trends in voting attitudes by gender and race/ethnicity show considerable variation. Women and race/ethnic minorities (especially African Americans) are an important element of the positive trends shown here. Findings on external efficacy are an exception to the generally optimistic trends with data showing a majority of respondents don’t believe public officials care what people like the respondent think. However, trends do not show an increase in negative attitudes about public officials. Implications of the findings are considered.
Fifty years of entomological publications in the Revista de Biología Tropical
Hanson,Paul;
Revista de Biología Tropical , 2002,
Abstract: over its fifty year history nearly twenty percent of the papers published in the revista de biología tropical have been about inseets and arachnids. in the 1950's papers on arthropods of medical importance were dominant, in the 1960's there was a poliferation of papers on bees, and in more recent years the subjects have become incresingly diverse. in terms of nationality of contributing authors, the journal appears to have become increasingly international in later years.
Toxicants and physicochemical characteristics of the seeds of African black pear (Dacryodes edulis).
I Hanson
African Journal of Food, Agriculture, Nutrition and Development , 2009,
Abstract: This experiment investigated the antinutrients content and functional properties of the seeds of African black pear (Dacryodes edulis). The study derived its importance from the environmental problem posed by the seeds of this highly cherished fruit. The aim of the project was to determine through empirical means the possible recycling potential that might be inherent in the seeds of the African black pear. Three seed varieties of the same sample categorized as Small (S), Medium (M) and Large (L) were used for this study. Standard experimental protocols were employed in the estimation of all indices. Data obtained indicate that the seed samples contained phytic acid: 12.13 + 1.14; 12.37 + 1.82 and 13.37 + 0.65g/100g sample on dry matter basis (DMB), respectively for Small, Medium and Large. Trypsin inhibitory activities (TIA) were determined as 546.67 + 30.55; 520.00 + 20.00; and 473.33 + 23.10g/100g sample on DMB in the same order, respectively. High amounts of oxalate 0.24 + 0.02 g-1100g for Small; 0.35 + 0.03 g-1100g for Medium and 0.37 + 0.03 g-1100g for Large while tannins were also found to be (5.07 + 0.14; 5.16 + 0.08; 5.02 + 0.16)g- 1100g for Small; Medium; and Large, respectively in the seeds. Water and oil absorption capacity as well as foam capacity and bulk density for all the samples did not differ significantly (P>0.05). The Medium seed flour, however, showed significantly (P<0.05) higher values in emulsion activity (40.82 + 1.52)% and foam stability (6.20 + 0.33)% as compared to foam stability of the Large seed (5.80 + 0.08)% variety. It may, therefore, be concluded from the strength of this novel results, that the seeds of Dacryodes edulis contained high amounts of phytic acid, oxalate, TIA and tannins. Physicochemical data on the other hand suggest the seeds of Dacryodes edulis to have valuable functional attributes of industrial interest.
Encyclopedia of Psychology and Religion
Mark Hanson
Theological Librarianship , 2010,
Abstract:
Fifty years of entomological publications in the Revista de Biología Tropical
Paul Hanson
Revista de Biología Tropical , 2002,
Abstract: Over its fifty year history nearly twenty percent of the papers published in the Revista de Biología Tropical have been about inseets and arachnids. In the 1950's papers on arthropods of medical importance were dominant, in the 1960's there was a poliferation of papers on bees, and in more recent years the subjects have become incresingly diverse. In terms of nationality of contributing authors, the journal appears to have become increasingly international in later years. A través de su historia de cincuenta a os, casi veinte porciento de los artículos publicados en la Revista de Biología Tropical trataron de insectos y arácnidos. En los aiíos cincuenta dominaron los artículos sobre artrópodos de importancia médica, en los a os sesenta hubo una proliferación de artículos sobre abejas, y en los últimos a os los temas incluidos se hicieron más diversos. En términos de la nacionalidad de los autores contribuyentes, parece que la revista se ha vuelto más internacional en los últimos a os.
Down from the Ivory Tower: Climate Science Faces the Real World
Howard Hanson
The Scientific World Journal , 2003, DOI: 10.1100/tsw.2003.27
Abstract:
Drift-Diffusion in Mangled Worlds Quantum Mechanics
Robin Hanson
Physics , 2003, DOI: 10.1098/rspa.2005.1640
Abstract: In Everett's many worlds interpretation, where quantum measurements are seen as decoherence events, inexact decoherence may let large worlds mangle the memories of observers in small worlds, creating a cutoff in observable world size. I solve a growth-drift-diffusion-absorption model of such a mangled worlds scenario, and show that it reproduces the Born probability rule closely, though not exactly. Thus deviations from exact decoherence can allow the Born rule to be derived in a many worlds approach via world counting, using a finite number of worlds and no new fundamental physics.
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