1,723,131 research outputs found
Onobrychis caput-galli (L.) Lam., a new Fabaceae for the Portuguese flora
Full text linkIn 2021, the author observed and collected Onobrychis caput-galli (L.) Lam., a species of Fabacee previously unknown to the Portuguese vascular flora, according to the Checklist of Portuguese Flora (Sequeira et al., 2011). The species was found in Algarve, in a very restricted area, with several sites of occurrence, most of which sharing similar habitat conditions. All evidence suggests that the species is native in Portugal and should be added to Portuguese vascular flora.En 2021, el autor observó y recolectó Onobrychis caput-galli (L.) Lam., una especie de Fabacee previamente desconocida para la flora vascular portuguesa, según la Checklist de la Flora de Portugal (Sequeira et al., 2011). La especie se encontró en el Algarve, en un área muy restringida, con varios sitios de ocurrencia, la mayoría de los cuales comparten condiciones de hábitat similares. Toda la evidencia sugiere que la especie es nativa de Portugal y debe agregarse a la flora vascular portuguesa
Protura
No full textCheck-list dei Proturi italiani nell'ambito del progetto:
Bologna M.A., Zapparoli M., Oliverio M., Minelli A., Bonato L., Cianferoni F., Stoch F. (eds.), Checklist of the Italian Fauna. Version 1.0. Last update: 2021-05-31. Available at: https://www.lifewatchitaly.eu/en/initiatives/checklist-fauna-italia-en/checklist
Herbicidal Potential of Callistemon viminalis Essential Oil against Echinochloa crus-galli L., Amaranthus viridis and Phalaris minor
No full textExperimental studies were carried out under invitro conditions to examine the effect of Callistemon viminalis essential oil (EO) against the Echinochloa crus-galli L., Amaranthus viridis and Phalaris minor. EO composition was analysed by gas chromatography/mass spectrometry, revealing that EO was rich in monoterpenes and sesquiterpenes like eucalyptol, D-limonene, α-terpineol and caryophyllene oxide. EO applied in the concentration range of 0.5, 1, 2 and 4 μl against Amaranthus viridis, Echinochloa crus-galli L. and Phalaris minor drastically affected the germination of all test plants and inhibited root and shoot development. Not only seedling growth, even the chlorophyll content also reduced appreciably. This led to the demonstration that Callistemon viminalis EO was negatively affecting the photosynthetic process. Upregulation of antioxidant enzymes activities indicated that these enzymes were providing protection against Callistemon viminalis EO induced stress. Amaranthus viridis was reported to be more sensitive in comparison to Echinochloa crus-galli L. and Phalaris minor.</jats:p
Distinct techniques of rejuvenation in the stem rooting of Erythrina crista-galli L.
Full text linkErythrina crista-galli L. is a tree species native to wetlands and pioneerformations in Brazil, displaying significant ornamental and landscape potential due to itsvibrant clusters of red and pink flowers, which attract hummingbirds, bees, and otherpollinators. Additionally, the species exhibits medicinal properties and contributes to therecovery of degraded environments and soils contaminated by petroleum. However,seedlings of this species are not found in large-scale production or sale in nurseries andflower shops in Curitiba and surrounding areas. Studies indicate that only 6% of Erythrinacrista-galli L. flowers produce seeds, and there is limited information on the viability andgermination of these seeds, posing challenges to cultivation. Therefore, this study aimedto analyze the vegetative propagation of the species using different types of stem cuttings:non-rejuvenated (from year-old shoots), mini-cuttings (produced from epicormic shoots ofnon-rejuvenated material), and rejuvenated material cuttings (from matrix regrowth), withthe application of indole butyric acid (IBA) at different concentrations at the base of thecuttings. The highest rooting percentage and lowest mortality rate were observed in themini-cutting experiment without IBA application. The rooting rate was 62.86%, and themortality rate was 18.57%. Thus, it is concluded that the stem rooting of Erythrinacrista-galli L. is influenced by the type and age of the cuttings, and the application of IBA isirrelevant to the rooting percentage.Erythrina crista-galli L., conhecida popularmente como corticeira-do-banhado,é uma espécie arbórea nativa das áreas alagadiças e formações pioneiras do Brasil queapresenta um grande potencial ornamental e paisagístico devido aos seus vistososcachos de flores avermelhadas e róseas, que atraem beija-flores, abelhas e outrospolinizadores. Além disso, a corticeira ainda apresenta propriedades medicinais e derecuperação de ambientes degradados e de solos contaminados por petróleo. Aindaassim, não são encontradas mudas da espécie em viveiros, ou em floriculturas deCuritiba-PR e região. Estudos mostram que apenas 6% das flores de Erythrina crista-galliL. produzem sementes, e existem poucas informações sobre a viabilidade e germinaçãodestas, o que dificulta seu cultivo. Sendo assim, este estudo teve como objetivo analisar apropagação vegetativa da espécie com o uso de diferentes tipos de estacas caulinares:não rejuvenescidas (oriundas das brotações do ano), miniestacas (produzidas a partir debrotações epicórmicas de material não rejuvenescido) e estacas de materialrejuvenescido (provenientes da rebrota das matrizes) em associação à aplicação de ácidoindol butírico (IBA) em diferentes concentrações na base das estacas. A maiorporcentagem de enraizamento (62,86%) e menor taxa de mortalidade (18,57%) foiobservada na miniestaquia sem a aplicação de IBA. Assim, conclui-se que oenraizamento caulinar de Erythrina crista-galli L. é influenciado pelo tipo de estaca a serutilizado, e que a aplicação de IBA não se faz necessária para aumento da induçãoradicial
The Pycnogonids (Arthropoda, Pycnogonida) of Torrevaldaliga (Tyrrhenian Sea), Italy, with data on Endeis biseriata, new record for the Mediterranean Sea
No full textNew data about the Mediterranean pycnogonids are given. For this contribution, we analysed 315 samples that until now had remained unidentified, collected in 1979–1980 in the Tyrrhenian Sea close to Torrevaldaliga, Italy. We found six species: Ammothella appendiculata, Anoplodactylus californicus, Endeis biseriata, Endeis spinosa, Nymphon gracile and Tanystylum conirostre. Two of them are the subject of taxonomical and faunal remarks: morphological features of Anoplodactylus californicus specimens are reported and discussed, and the first record of Endeis biseriata for the Mediterranean Sea is reported
Valid inequalities for quadratic optimisation with domain constraints
Full text linkIn 2013, Buchheim and Wiegele introduced a quadratic optimisation problem, in which the domain of each variable is a closed subset of the reals. This problem includes several other important problems as special cases. We study some convex sets and polyhedra associated with the problem, and derive several families of strong valid inequalities. We also present some encouraging computational results, obtained by applying our inequalities to (a) integer quadratic programs with box constraints and (b) portfolio optimisation problems with semi-continuous variables
On upper bounds for the multiple knapsack assignment problem
Full text linkThe Multiple Knapsack Assignment Problem is a strongly NP-hard combinatorial optimisation problem, with several applications. We show that an upper bound for the problem, due to Kataoka and Yamada, can be computed in linear time. We then show that some bounds due to Martello and Monaci dominate the Kataoka-Yamada bound. Finally, we define an even stronger bound, which turns out to be particularly effective when the number of knapsacks is not a multiple of the number of item classes
ON AN ANOMALOUS SPECIMEN OF ACERENTOMON DODEROI SILVESTRI, 1907 (PROTURA: ACERENTOMIDAE)
No full textA praeimago specimen belonging to genus Acerentomon - doderoi group collected in Sestri Levante (NW-Italy) shows a set of morphological characters that led us to attribute it to an hypothetic new species. In this note we compare such specimen with others from the same locality and with the other species belonging to genus Acerentomon, concluding that it must be considered an anomalous Acerentomon doderoi with additional setae (d6) on the head
A separation algorithm for the simple plant location problem
Full text linkThe Simple Plant Location Problem (SPLP) is a well-known NP-hard optimisation problem with applications in logistics. Although many families of facet-defining inequalities are known for the associated polyhedron, very little work has been done on separation algorithms. We present the first ever polynomial-time separation algorithm for the SPLP that separates exactly over an exponentially large family of facet-defining inequalities. We also present some promising computational results
Pycnogonida
No full textCheck-list online dei Picnogonidi italiani nell'ambito del seguente progetto.
Bologna M.A., Zapparoli M., Oliverio M., Minelli A., Bonato L., Cianferoni F., Stoch F. (eds.), Checklist of the Italian Fauna. Version 1.0. Last update: 2021-05-31. Available at: https://www.lifewatchitaly.eu/en/initiatives/checklist-fauna-italia-en/checklist
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