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Effective transboundary corridors play a crucial role in jaguar Panthera onca conservation. Local residents reported jaguar sightings along the Baritú–Tariquía Biological Corridor, which prompted us to carry out this camera-trap survey. We surveyed an area of 1,243 km2 across the corridor to confirm jaguar presence. We used 50 single camera stations, with cameras placed c. 5 km apart. We placed the cameras along trails, streams and mountain ridges. We recorded jaguars at seven sites across the Corridor; at least three different individuals were identified. These records confirm the presence of the jaguar in the Baritú–Tariquía Biological Corridor between Argentina and Bolivia, a trans-frontier area of the Austral Yungas facing multiple threats but hosting one of the southernmost jaguar populations. Conservation efforts in border regions can promote collaboration and synergies between agencies and other conservation stakeholders, with important implications for wide-ranging predators such as jaguars and their habitats.
The present 28th ECLIM in Rome is a continuation of the series of
conferences that started in Frascati, Italy in 1966. These conferences
deal with the interdisciplinary subjects of laser interaction with matter,
related not only to basic science but also to a wide range of
applications. ECLIM is an independent scientific conference, free of any
institutional or political influence, keeping science without
Introduction. Chlorophyll fluorescence (chl-fluorescence) has been used in postharvest studies as a non-destructive technique for evaluating fruit ripening. Since there are no available studies using chl-fluorescence in guava fruit, the aim of this work was to verify the relations between chl-fluorescence parameters and fruit quality attributes, such as skin color and fruit firmness, and to measure the chl-fluorescence during ripening of guava fruit. Materials and methods. Firstly, maximal (Fm), minimal (Fo), variable (Fv), and variable to maximal [Fv/Fm] fluorescence yields, skin color (Hº) and fruit firmness were evaluated in guava fruit harvested at three ripeness stages: dark-green (I), light-green (II) and yellowish-green (III). Secondly, changes in the above chl-fluorescence parameters and Hº were measured during 7 days of ripening. Relations between the evaluated parameters were also studied. Results and discussion. The three ripeness stages were well segregated using the Hº, Fm and fruit firmness parameters. Fo was insensible to early changes in fruit ripening, maintaining relatively stable values until fruit firmness of 20 N. When considering changes in chl-fluorescence and Hº during ripening, there were no significant differences between guava fruit harvested at stages II or III. The [Fv/Fm] value decline was only evident on the fifth day of ripening, whereas Fv, Fm and Hº began to decrease on the first day. Regardless of [Fv/Fm], the relations between chl-fluorescence parameters and Hº tended to increase from ripeness stages I to III, with Fm having the highest correlation with Hº. The results show that chl-fluorescence can be used to evaluate the ripening and senescence of guava fruit, with Fm being a good ripening indicator.
This issue of Laser and Particle Beams
(LPB) includes only a portion of the more than
200 papers presented to the XXV European Conference on
Laser Interaction with Matter (ECLIM), organized by the
Frascati ICF Physics and Technology Laboratory of the Associazione
EURATOM-ENEA, in Formia (Italy), on May 4-8, 1999.
In energy-oriented ICF, a nondeterministic ignition process can be acceptable, provided the ignition probability be large enough. We present fuel gain calculations for D-T assemblies ignited by a supercritical spark, statistically created within a cluster of many subcritical ones, at the end of an implosion process. It is assigned the total number of sparks and the probability of having at least one of them supercritical. Comparatively to the central, single-spark approach, the multi-spark scheme is characterized by relaxed symmetry requirements. This allows to consider as realistic the achievement of higher fuel densities and gains comparable (or higher) to those typical of the single-spark approach, as evaluated for currently accepted spark convergence ratios.
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