Publications by authors named "Davidian E"

A new species of the aphidiine parasitoid Binodoxys yunnanicus Davidian, sp. nov. is described and illustrated from Yunnan Province, China.

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A new species of aphid parasitoid, Ephedrus carsteni Davidian, sp. nov. (Braconidae: Aphidiinae), is described and illustrated from Late Eocene Baltic amber.

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The descriptions of two new species from the genus Binodoxys Mackauer characterised by short prongs on the posterior margin of the last metasomal sternite are provided from the north-western territory of the European part and Eastern Siberia of Russia. Binodoxys crataegi sp. nov.

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When and where animals reproduce influences the social, demographic and genetic properties of the groups and populations they live in. We examined the extent to which male spotted hyenas () coordinate their breeding-group choice. We tested whether their propensity to settle in the same group is shaped by passive processes driven by similarities in their socio-ecological background and genotype or by an adaptive process driven by kin selection.

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The ultimate payoff of behaviours depends not only on their direct impact on an individual, but also on the impact on their relatives. Local relatedness-the average relatedness of an individual to their social environment-therefore has profound effects on social and life history evolution. Recent work has begun to show that local relatedness has the potential to change systematically over an individual's lifetime, a process called kinship dynamics.

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The rate of adaptive evolution, the contribution of selection to genetic changes that increase mean fitness, is determined by the additive genetic variance in individual relative fitness. To date, there are few robust estimates of this parameter for natural populations, and it is therefore unclear whether adaptive evolution can play a meaningful role in short-term population dynamics. We developed and applied quantitative genetic methods to long-term datasets from 19 wild bird and mammal populations and found that, while estimates vary between populations, additive genetic variance in relative fitness is often substantial and, on average, twice that of previous estimates.

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In animal societies, control over resources and reproduction is often biased towards one sex. Yet, the ecological and evolutionary underpinnings of male-female power asymmetries remain poorly understood. We outline a comprehensive framework to quantify and predict the dynamics of male-female power relationships within and across mammalian species.

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Identifying how dominance within and between the sexes is established is pivotal to understanding sexual selection and sexual conflict. In many species, members of one sex dominate those of the other in one-on-one interactions. Whether this results from a disparity in intrinsic attributes, such as strength and aggressiveness, or in extrinsic factors, such as social support, is currently unknown.

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Two different anesthesia models were compared in terms of surgical duration, safer outcomes, and economic implications. Third molar surgeries performed with and without a separate dentist anesthesiologist were evaluated by a retrospective data analysis of the surgical operative times. For more difficult surgeries, substantially shorter operative times were observed with the dentist anesthesiologist model, leading to a more favorable surgical outcome.

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Dispersal is a key driver of ecological and evolutionary processes. Despite substantial efforts to explain the evolution of dispersal, we still do not fully understand why individuals of the same sex of a species vary in their propensity to disperse. The dominant hypothesis emphasizes movements and assumes that leaving home (dispersal) and staying at home (philopatry) are two alternative strategies providing different fitness.

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We report an unexpected failed laryngeal mask airway in a patient with unrecognized lingual tonsil hypertrophy (LTH). A 19-year-old obese woman presented for extraction of multiple teeth via intravenous general anesthesia. Surgery was interrupted due to a laryngospasm midway through the procedure.

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In order to determine if dentist anesthesiologists (DAs) actively contribute to research in the field of anesthesiology, and thus contribute new knowledge to the field, an extensive literature search was accomplished. DAs make up only 1.5% of dentists who actively contribute to anesthesia research but account for 10% of publications.

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The effects of viral and cellular oncogenes on a human erythroleukemic cell line (TF-1) were investigated. The TF-1 cell line required granulocyte/macrophage-colony stimulating factor (GM-CSF) for growth but this factor-dependency was abrogated by the constitutive expression of either viral (v-fms, v-Ha-ras and v-src) or cellular oncogenes (BCR-ABL and Delta N-raf). Furthermore the overexpression of the human insulin-like growth factor-1 (IGF-1) receptor could substitute the dependency on GM-CSF with a requirement for either IGF-1 or insulin as a proliferative signal.

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The effects of different viral and cellular oncogenes on the cytokine-dependency of murine hematopoietic cell lines were compared. The myeloid FDC-P1 cell line was sensitive to abrogation of growth factor-dependency by the constitutive expression of viral oncogenes (v-abl, v-src, v-Ha-ras, and v-fms) and the activated cellular oncogene BCR-ABL and Delta Nraf. The Delta Nraf encoded serine-threonine kinase was approximately 100-fold less efficient in relieving the factor-dependency of FDC-P1 cells than the other oncogenes examined.

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