122,431 research outputs found
Mating behavior and vibrational communication of the meadow spittlebug Philaenus spumarius
No full textAdieu au faux paradis, Film germano-turc de Tevfik Baser
No full textVideau André. Adieu au faux paradis, Film germano-turc de Tevfik Baser. In: Hommes et Migrations, n°1132, mai 1990. Les Africains Noirs en France. Deuxième partie : La vie culturelle. pp. 69-70
The effect of distance between parasitoid and host on the parasitism of Psyttalia concolor (Szépligeti) in organic olive orchards
No full textBactrocera oleae (Rossi) is a major pest of olive fruits. Biological control of olive fruit fly mainly relies on the activity of the Braconid species Psyttalia concolor (Szépligeti), which parasitizes Bactrocera oleae at the larval stage. Parasitism tests have been carried out at the insect growing facility (insectariums) of the Mediterranean Agronomic Institute of Bari (C.I.H.E.A.M.). The critical point of the use of P. concolor as a biological control agent in organic olive crop is the assessment of its effectiveness against B. oleae. Its lower presence in fruits of cultivated olives rather than in small fruits of wild olives suggests an influence of the size of the fruit, and of the thickness of its pulp on the parasitization of P. concolor. Therefore, the aim of this research was to investigate the capacity of the females of P. concolor to lay their eggs into the target host according to the distance existing between the female and the host larva. In these tests, the substitution host Ceratitis capitata was used and parasitism of P. concolor was tested at different distances (0, 0.5, 1, 1.5, 2, 2.5 and 3 mm) to the host larvae at different times (7 min, 15 min, 30 min and 60 min) of interaction.
Predetermined distances between the parasitoids and the target larvae were arranged by locating the flying females into cubical cages of 40x40x40 cm with Plexiglas walls and the open roof covered with a tulle tissue in order to avoid that any insects from outside may enter the cages, and to allow the females to protrude their ovipositors. On these roofs, plastic cylinders containing the target larvae were placed with the open bases arranged with a tulle tissue, to allow the contact with the parasitoid females. Considering the width of the tissues negligible, distances were set by metal separators with increasing thickness.
Parasitism level at 7 min was not significantly different at 2, 2.5 and 3 mm distances. Parasitism level was the highest at 0, 0.5, and 1 mm distances with no significant changes. Parasitism at 15 min showed a high variability according to the distances. The highest level resulted at 0.5 and 1 mm distances, the lowest at 3 mm distance. At 30 min interaction, the highest level of parasitism was at 0 mm distance, whilst at 1 and 1.5 mm the level was lower with no significant changes. Again, parasitism level was the lowest at 3 mm distance. The highest level of parasitism at 60 min was detected at 1.5 mm distance and was as lower as the distance increased.
In conclusion, the study showed that the females of P. concolor were not able to parasite the target larvae at distances higher than 2.5 mm. Generally, the parasitism level decreases with the increase of the distance between target larvae and parasitoid females. At the lowest distances (0, 0.5 and 1 mm) hyper parasitism occurred and the target pupae were killed, but also the development of the parasitoids into adults was very difficult for nutrient unavailability. Biological control of P. concolor against B. oleae larvae may give satisfactory results only if the depth at which the target larvae are located into the olive drupes is not higher than 2 or 2.5 mm from the surfac
Influenza delle caratteristiche chimico-fisiche del suolo e della gestione fitosanitaria sulla concentrazione di solfati in oliveti e vigneti biologici della Puglia
No full textKaurane diterpenoids from three Sideritis species
No full textSome kaurane diterpenoids were isolated from 3 species of the genus Sideritis (Lamiaceae) growing in the Eastern Mediterranean region. Sideritis libanotica subsp. libanotica contained siderol 2 and sideridiol 3. Sideritis erythrantha var. erythrantha yielded sideridiol 3. Sideritis perfoliata gave siderol 2, sideridiol 3 and sideritriol 4. The products are known as they occur in another species of Sideritis growing in Italy and in other species growing also in Turkey. The products are isolated for the first time from these 3 species. The taxonomic significance of these results is discussed
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Composition of the essential oils of four endemic Sideritis species from Turkey
No full textSideritis phlomoides Boiss. & Bal., S. vulcanica Hub.-Mor,. S. vuralii Duman & Baser and S. caesarea Duman, Aytac & Baser are endemic species in Turkey. Water-distilled essential oils from the flowering spike of these plants were analysed by GCMS. beta -Pinens (35%). 1,8-cineole (15%) and alpha -pinene (15%) were the main component in the oil of S. vuralii. while beta -caryophyllene (8%) and caryophyllene oxide (7%) were the major constitutents in the oil of S.. caesarea. The oils from S. phlomoides and S. vulcanica tr were found to contain beta -caryophyllene (31% and 10%) as major constituents. alpha -Bisabolol (16%) was also found as a major component in the oil of Sideritis phlomoides. Copyright (C) 1999 John Wiley & Sons, Ltd
The vanishing author in computer-generated works: a critical analysis of recent Australian case law
No full textAbstract
The use of software is ubiquitous in the creation of many copyright works, yet the requirement in copyright law that every work have a human author who engages in independent intellectual effort means that its use may prevent copyright subsistence. Several recent Australian cases have refocused attention on authorship as an essential criterion of copyright subsistence, and these cases suggest that much computer-produced output may be authorless and thus lack copyright protection. This article, the first in a two-part series, analyses how each case deals with the question of authorship of computer-produced works and why the use of software diminishes copyright protection for a significant number of computer-generated works. The article critiques the application of conventional notions of human authorship developed in the pre-computer age to modern productions and suggests alternative approaches to authorship that satisfy both the major objectives of copyright policy and the need to adapt to the computer age. The article argues that, without a broader judicial approach to authorship of computer-generated works, Parliament must remedy the lacuna in protection for these ‘authorless’ works. Possible solutions for reform are suggested. In a forthcoming article, the author comprehensively examines those reform proposals
Behavioural responses of the egg parasitoid Trissolcus mitsukurii to the footprints of Halyomorpha halys and Nezara viridula
No full textTrissolcus mitsukurii is Asian egg parasitoids associated to different pentatomids such as Halyomorpha halys. Adventive populations of T. mitsukurii were found in Northern Italy showing a great impact on this pest, suggesting its exploitation as a biological control agent (BCA) against H. halys. Releasing an exotic parasitoid requires investigating the interaction BCA/environment, to avoid negative impacts on the entomofauna of the new habitat. Trissolcus mitsukurii is mainly associated to Nezara viridula in its native area, hence, we investigated the female parasitoid’s ability to distinguish between naturally released cues of H. halys and N. viridula and compared it with the foraging behaviour of Trissolcus japonicus. A single female parasitoid was exposed to contact kairomones of both pests, to evaluate its modifications in orthokinetic and locomotory behaviour. Additionally, for T. mitsukurii, synthetic compounds simulating the cues of the two pentatomids were used. The results confirmed the preference of T. japonicus for H. halys while T. mitsukurii preferred N. viridula’s cues. The significance and consequences of these results in the biological control of H. halys in invaded areas are discusse
- …
