393 research outputs found
Lateralized courtship in a parasitic wasp
No full textLateralization (i.e. left-right asymmetries in the brain and behaviour) of courtship
displays has been examined in a growing number vertebrate species, while
evidence for invertebrates is limited. In this study, we investigated lateralization
of courtship and mating displays in the parasitic wasp Leptomastidea abnormis.
Results showed a population-level lateralization of male courtship displays.
Male antennal tapping on the female’s head was right-biased. However, rightbiased
male courtship acts were not characterized by higher male antennal
tapping frequencies, nor success in mating although antennal tapping
frequency was higher in males with mating success with respect to
unsuccessful males. Overall, our results add basic knowledge to the
behavioural ecology of insect parasitoids. To the best of our knowledge, this is
the first report of behavioural lateralization in parasitic Hymenoptera
Early adult learning affects host preferences in the tephritid parasitoid Psyttalia concolor (Hymenoptera: Braconidae)
No full textParasitic wasps rely on a hierarchy of stimuli to
locate their hosts. Olfactory cues from the natal host complex
affect parasitoid preferences and can be learned by
parasitoids during larval stages and the early adult stage.
While the existence of pre-imaginal conditioning has been
documented in several braconid aphid parasitoids, no evidence
has yet been provided for parasitic wasps attacking
Tephritidae. Psyttalia concolor (Hymenoptera: Braconidae)
is a koinobiont larval–pupal endoparasitoid of tephritid flies.
In this study, we evaluated the influence of larval and early
adult experience on subsequent host seeking in P. concolor
females. Parasitoids were reared using Ceratitis capitata or
Bactrocera oleae larvae as hosts, and emerging wasp adults
were tested for host preferences in two-choice bioassays. P.
concolor females preferred to oviposit in, and had higher
oviposition success rates on the natal host. When P. concolor
females were excised from their host puparia, preventing
them from chewing emergence holes, they lost their
natal host preference, solidifying the evidence of early adult
learning for host selection. This study adds to the growing
body of basic knowledge on braconid host-location behavior.
From an applied point of view, training procedures for
early adult learning has potential for use in mass rearing of
parasitoids employed in biological control programs against
tephritid flies
Benjamin Russel Hanby - Author of Darling Nelly Gray
No full text“Benjamin Russel Hanby - Author of ‘Darling Nelly Gray’,” was first published in April, 1905 as an article in the “Quarterly,” the publication of the Ohio State Archaeological and Historical Society. Author Charles Burleigh Galbreath was an Ohio educator and librarian who twice served as the State Librarian (1896-1911 and 1915-18) and was the secretary and librarian of the Ohio Archaeological and Historical Society (today known as the Ohio History Connection) from 1920 until his death in 1934. Burleigh published numerous articles, pamphlets, and books on Ohio history. This book contains correspondence not published in any other account of Benjamin Hanby’s life.https://digitalcommons.otterbein.edu/archives_hanby/1004/thumbnail.jp
Hope in Africa : the role of universities in times of political transition
No full textThe original publication is available at http://www.sun.ac.za/university/Management/rektor/speeches.htmlProf H Russel Botman, Rektor en VisekanselierPaper presented at Talloires Network Leaders Conference, June 2011, Madrid, Spain, author examining the role of universities in times of political transition
Improving the piezoelectric properties of thick-film PZT: the influence of paste composition, powder milling process and electrode material
No full textThis paper details improvements of the d33 coefficient for thick-film Lead–Zirconate–Titanate (PZT) layers. In particular, the effect that the powder milling process has on particle size, shape and distribution has been investigated. Ball milled, jet milled and attritor milled powders were obtained from Morgan Electro-Ceramics Ltd. These powders were mixed with various ratios of lead borosilicate glass in the range of 5–20% by weight and an appropriate quantity of Electro-Science Laboratories (ESL) 400 solvent to formulate a screen printable thixotropic paste. The use of a polymer top electrode to reduce the number of firing cycles the PZT layer is subjected to was also investigated. The results show that the highest values of d33 were obtained from the ball milled powder with 10% glass content, but the most consistent results were obtained from the attritor milled samples. The samples printed with a polymer top electrode have shown an average increase of around 15% in the value of d33
Goebbels And Der Angriff
No full textThe Berlin newspaper Der Angriff (The Attack), founded by Joseph Goebbels in 1927, was a significant instrument for arousing support for Nazi ideas. Berlin was the center of the political life of the Weimar Republic, and Goebbels became an actor upon this frenetic stage in 1926, becoming Gauleiter of Berlin’s Nazis. Focusing on the period from 1927 to 1933, a time the Nazis later called “the blood years, Russel Lemmons examines how Der Angriff was used to promote support for Nazism. Some of the most important propaganda motifs of the Third Reich first appeared in the pages of this newspaper. Horst Wessel, murdered by the German Communist Party in 1930, became the archetypal Nazi hero; much of his legend began on the pages of Der Angriff. Other Nazi propaganda themes—the “Unknown SA man and the “myth of resurrection and return”—made their first appearances in this newspaper. How could the Germans, seemingly among the most cultured people in Europe, hand over their fate to the Nazis? As this book demonstrates, Der Angriff had much to do with the rise of National Socialism in Berlin and the cataclysmic results.
Russel Lemmons, professor of history at Jacksonville State University, is the author of Hitler\u27s Rival.
A thoughtful and highly informative book. —New York Review of Books
The best examination of the \u27fighting years\u27 of der Angriff available and provides valuable insight into the success of the NSDAP in Berlin during its rise to power. —The Historianhttps://uknowledge.uky.edu/upk_european_history/1008/thumbnail.jp
Alfred Russel Wallace Notes 14: Background for Wallace\u27s 1845 Kington Essay
No full text‘An Essay, On the Best Method of Conducting the Kington Mechanic\u27s Institution’ is one of the earliest written works by Alfred Russel Wallace (1823−1913) known to have reached print. The circumstances of its writing are still not clear, though I here review pertaining facts and theories that seem to indicate Wallace actually was the author of the essay, which had been questioned
Alfred Russel Wallace, antropólogo: contribuciones a la antropología física
No full textThe figure of Alfred Russel Wallace as an anthropologist has scarcely been recognised in the history of the discipline. An important point is to place the author within the anthropological discussions of the Victorian era, from his early interest as a naturalist in historicizing human beings, to his institutional work as the first president of an anthropology department in England. In this context, the paper seeks to present Wallace’s perspective on physical anthropology, based on his anthropological work, which includes references to the origin of human races in naturalistic terms, the development of distinctive physical characteristics of human beings, or the evolutionary relationship between primates. With this, perspective on the development of physical anthropology in the nineteenth century is broadened, opening up the spectrum to authors who contributed significantly to its development.La figura de Alfred Russel Wallace dentro de la antropología ha sido escasamente reconocida dentro de la historia de la disciplina. Un punto importante es ubicar al autor dentro de las discusiones antropológicas de la época victoriana, desde su interés temprano como naturalista por historizar a los seres humanos, hasta su labor institucional como el primer presidente de un departamento de antropología en Inglaterra. En ese contexto, el objetivo del trabajo es presentar la visión de Wallace respecto a la antropología física, a partir de su obra antropológica, que incluye referencias al origen de las razas humanas en términos naturalistas, al desarrollo de características físicas distintivas de los seres humanos o a la relación evolutiva entre primates. Con esto, se amplía la perspectiva sobre el desarrollo de la antropología física en el siglo XIX, al abrir el abanico a autores que contribuyeron de manera importante a su desarrollo
Living conditions and subjective well-being of farmers - An ordered response analysis of regional differences and changes over time
No full textThe liberalisation of trade with building down of tariffs and quotas, and with subsequently lower output prices, has enforced considerable structural changes in the agricultural sector. In Norway, both naturally given factors such as climate and topography, and social conditions such as a tradition for small family farms and strong governmental regulations, contribute in making this process even harder on the individual farmer. So how do the farmers respond? National farm statistics show that the amount of cultivated land stays approximately the same even though the number of farm units and agricultural employment falls annually. This implies that both farm size and productivity have increased. In this paper we utilise sample survey data on living conditions in agricultural households to examine whether we can observe changes in farmers ’experienced utility. Have contentment dropped and are there any obvious regional differences in contentment? The data consists of non-overlapping cross-sections for the years 1995 and 2002 and we make use of a standard ordered probability model in the estimations.
Old School, San Antonio
No full textThis collection of stories is based on the author’s experiences as a middle school teacher at an alternative campus in south Texas, in a district whose population was largely comprised of Mexican-American and low-income families. The Eagle School is based on a program that existed in the 1990s to address the special needs of “bubble” students, children who were failing in elementary school because of factors such as poverty, neglect, and violence at home. Students were selected for the program based on recommendations from their counselors, with the hope that the small campus of twelve teachers would provide its 150 sixth, seventh, and eighth graders with a safe haven, allowing them to focusing on their studies. The ultimate goals of the program were to prevent students from dropping out of school and to engage them in interdisciplinary projects that would advance them academically, preparing them to return to their appropriate grade levels in high school. Ms. Russel, a character based on the author, recounts stories of her efforts to help students at the Eagle School, as well as stories of her own friendships, aspirations, and disappointments off campus. Each story represents a distinct moment during the six years that she teaches at the Eagle School, and each focuses on a specific student or group of students whose conflicts complicate her own
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