1,720,963 research outputs found
BIOCONTROL OF THE BACTERIAL BLIGHT OF WALNUT: IS THERE A CHANCE TO REDUCE COPPER INPUTS INTO WALNUT GROVES?
No full textThe bacterial blight is a re-emerging disease, severely affecting
the productivity of walnut groves. Disease symptoms are observed
on all aerial parts of the host plant, but the most damaging are the
necrotic spots developing on fruits, leading to massive fruit drops,
mainly before endocarp hardening. The causal agent is Xanthomonas
arboricola pv. juglandis (Xaj), a gram-negative rod with a worldwide
distribution. The population structure of Xaj includes several morphotypes,
at least five sequence types, and other features confirming
its genomic heterogeneity. Copper resistance is widespread and very
effective among Xaj populations: therefore, disease management
based on copper sprays is not particularly effective, even in cases
of 10-14 treatments during the growing season. The recent, severe
outbreaks reported in Italy are due to two concomitant events: i) the
rapid increase of walnut acreage, especially in the northern part of
the Country and ii) the development of Xaj populations showing
high resistance to copper. Since most of the cultivated walnut varieties
are either highly susceptible or susceptible to the disease, we
tried to implement control strategies based on the use of a single antagonist
or the field application of microbial consortia. Additionally,
innovative agrochemicals, with a reduced copper content, have also
been used. Results showed that: i) microbial biocontrol agents were
able to significantly reduce the disease in the field; ii) innovative
agrochemicals may reduce the bacterial blight, but might enhance
phytotoxicity; iii) a significant reduction of copper inputs is possible,
coupled with an effective disease control in walnut groves
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Optical camera communications for indoor positioning: high accuracy, low cost, and low power consumption
No full text10 Gbit/s OWC System for Intra-Data Centers links
No full textWe design and experimentally demonstrate a 10 Gbit/s Optical Wireless Communication (OWC) system that can be quickly deployed and effectively used in Data Centers (DCs) networks. It is realized by means of Commercial Offthe- Shelf (COTS) components, does not need active alignment, and its 8 mm tolerance allows for simple passive alignment. We successfully tested the system from 1.5 to 3 m link distance with a target Bit Error Ratio (BER) of 10..9. Its features can allow to realize an array of transceivers to further increase the capacity. Finally, the system power consumption (10 pJ/bit) is much lower than its alternatives. These results demonstrate that the proposed OWC system can be a viable solution for future DC networks
Preliminary Study On CAN-bus Transmission Over Optical Wireless For Satellite Applications
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Revolutionizing spacecraft communication: optical wireless technology for reduced weight and cost
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