scholarly journals Triplochiton scleroxylon K. Schum (Malvaceae-Sterculioideae): a key species of the Oro worship in Benin

2021 ◽  
Vol 22 ◽  
Author(s):  
Gabin Ganka ◽  
Adandé Belarmain Fandohan
Keyword(s):  
Key Species

On the Linear Geometry of Lanthanide Hydroxide (Ln—OH, Ln=La-Lu)

2019 ◽  
Author(s):  
Hassan Harb ◽  
Lee Thompson ◽  
Hrant Hratchian
Keyword(s):  
Triple Bond ◽  
Density Functional ◽  
Valence Electron ◽  
Density Functional Theory Calculations ◽  
Electron Configuration ◽  
Functional Theory ◽  
Key Species ◽  
Pi Orbitals ◽  
Lanthanide Hydroxide ◽  
Linear Geometry

Lanthanide hydroxides are key species in a variety of catalytic processes and in the preparation of corresponding oxides. This work explores the fundamental structure and bonding of the simplest lanthanide hydroxide, LnOH (Ln=La-Lu), using density functional theory calculations. Interestingly, the calculations predict that all structures of this series will be linear. Furthermore, these results indicate a valence electron configuration featuring an occupied sigma orbital and two occupied pi orbitals for all LnOH compounds, suggesting that the lanthanide-hydroxide bond is best characterized as a covalent triple bond.

On the Linear Geometry of Lanthanide Hydroxide (Ln—OH, Ln=La-Lu)

2019 ◽  
Author(s):  
Hassan Harb ◽  
Lee Thompson ◽  
Hrant Hratchian
Keyword(s):  
Triple Bond ◽  
Density Functional ◽  
Valence Electron ◽  
Density Functional Theory Calculations ◽  
Electron Configuration ◽  
Functional Theory ◽  
Key Species ◽  
Pi Orbitals ◽  
Lanthanide Hydroxide ◽  
Linear Geometry

Lanthanide hydroxides are key species in a variety of catalytic processes and in the preparation of corresponding oxides. This work explores the fundamental structure and bonding of the simplest lanthanide hydroxide, LnOH (Ln=La-Lu), using density functional theory calculations. Interestingly, the calculations predict that all structures of this series will be linear. Furthermore, these results indicate a valence electron configuration featuring an occupied sigma orbital and two occupied pi orbitals for all LnOH compounds, suggesting that the lanthanide-hydroxide bond is best characterized as a covalent triple bond.

scholarly journals Sensitivity of the Norwegian and Barents Sea Atlantis end-to-end ecosystem model to parameter perturbations of key species

PLoS ONE ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. e0210419 ◽  
Author(s):  
Cecilie Hansen ◽  
Kenneth F. Drinkwater ◽  
Anne Jähkel ◽  
Elizabeth A. Fulton ◽  
Rebecca Gorton ◽  
...  
Keyword(s):  
Barents Sea ◽  
Ecosystem Model ◽  
Key Species ◽  
Parameter Perturbations ◽  
End To End

Enzyme and osmotic adjustment compounds of key species can help explain shrub encroachment in a semiarid sandy grassland

2019 ◽  
Vol 101 ◽  
pp. 541-551 ◽  
Author(s):  
Liu Yang ◽  
Liming Lai ◽  
Jihua Zhou ◽  
Sangui Yi ◽  
Qinglin Sun ◽  
...  
Keyword(s):  
Osmotic Adjustment ◽  
Shrub Encroachment ◽  
Key Species ◽  
Sandy Grassland

Epibiosis on eggs and brooding care in the burrowing crab Chasmagnathus granulatus (Brachyura:Varunidae): comparison between mudflats and salt marshes

2007 ◽  
Vol 87 (4) ◽  
pp. 893-901 ◽  
Author(s):  
Paola V. Silva ◽  
Tomás A. Luppi ◽  
Eduardo D. Spivak
Keyword(s):  
Salt Marsh ◽  
Filamentous Fungi ◽  
Salt Marshes ◽  
Maternal Care ◽  
Spartina Densiflora ◽  
Incubation Chamber ◽  
Stage Of Development ◽  
Key Species ◽  
Burrowing Crab ◽  
Chasmagnathus Granulatus

Chasmagnathus granulatus is a semiterrestrial intertidal burrowing crab that inhabits both the unvegetated mudflats and the cordgrass (Spartina densiflora) salt marshes in Mar Chiquita Lagoon (Argentina), where it is considered the ecologically key species. The mass of C. granulatus eggs incubated by females is colonized by epibiotic micro-organisms and accumulates detritus. The type of epibionts that use eggs as a substrate, the infestation degree, the maternal care behaviour and the protection of the incubation chamber were compared between females living on mudflats and on Spartina-dominated areas. In both places, the epibiosis by bacteria and filamentous fungi and peritrichid colonial ciliate was significantly higher in the periphery than in the centre of the brood mass. The accumulation of detritus was higher in the periphery in mudflat females but not in salt marsh females. Moreover, the level of detritus was significantly higher in mudflat than in salt marsh females only in the periphery of the brood. The infestation level of bacteria and fungi, and peritrichids, increased throughout the embryonic development only in mudflat females. The periphery of the brood mass was significantly more contaminated in mudflat than in marsh females, while the central region of the brood mass did not differ between habitats. The pleopods were significantly more contaminated by bacteria and filamentous fungi and peritrichid colonial ciliates in premoult females than in postmoult females, independently from the collection site. The percentage of females with abnormal embryos was significantly higher in mudflats (26.7%) than in marshes (12.3%). Females with late embryos spent more time flapping the abdomen and probing the embryos with the chela. Non-ovigerous females did not perform specific maternal care activities. The volume of brood mass both in early or late stage of development is greater than that of the incubation chamber and, consequently, peripheral embryos are more exposed.

scholarly journals The story of NCN as a key species in prompt-NO formation

2021 ◽  
Vol 87 ◽  
pp. 100940
Author(s):  
Nathalie Lamoureux ◽  
Pascale Desgroux ◽  
Matthias Olzmann ◽  
Gernot Friedrichs
Keyword(s):  
No Formation ◽  
Key Species

scholarly journals Microphytoplankton structure from the neritic and oceanic regions of Pernambuco State - Brazil

2009 ◽  
Vol 69 (4) ◽  
pp. 1037-1046 ◽  
Author(s):  
ML. Koening ◽  
BE. Wanderley ◽  
SJ. Macedo
Keyword(s):  
Principal Component ◽  
Mesh Size ◽  
Species Number ◽  
Phytoplankton Diversity ◽  
Trichodesmium Erythraeum ◽  
Species Association ◽  
Tropical Water ◽  
Key Species ◽  
Distribution And Ecology ◽  
Planktonic Species

This research was carried out to assess phytoplankton diversity, distribution and ecology on the Pernambuco Continental Shelf and Oceanic region (lat. 7º 33' 00" S to 8º 41' 50" S and long. 34º 04' 47" W to 35º 01' 20" W). Samples were collected during the Joint Oceanographics Projects (JOPS II-Leg 5) by double oblique hauls with a baby bongo net 64 µm mesh size at depth between 14 and 150 m in inshore and offshore waters respectively, in seven transects, totaling 34 stations. The temperature and salinity characterised the tropical water masses. The dissolved oxygen was oversaturated in all stations. The nutrient-low concentrations showed an oligothrophic pattern in the whole area. 173 specific and infraspecific taxa were identified: Dinophyta (103 taxa), Bacillariophyta (61 taxa), Cyanobacteria (7 taxa), Chlorophyta and Chrysophyta (1 taxon). The family Ceratiaceae presented the highest species number (47 taxa). The cyanobacteria Trichodesmium erythraeum Ehrenberg, Oscillatoria spp. and the diatom Leptocylindrus danicus Cleve had higher frequence of occurrence and abundance. Species diversity varied from 0.71 to 3.46 bits.cell-1 and this low index was due to Trichodesmium erythraeum bloom and evenness from 0.14 to 0.65, showing an unstable pattern. The oceanic planktonic species were responsible for the higher richness with 78 taxa, corresponding to 58.39% of the total microphytoplankton. The species association presented two groups. The first one divided in two subgroups: one associated to the neritic/oceanic and oceanic planktonic species and the other to the oligotrophic indicator species. The second group was composed of some key species which were the most abundant and frequent in the area. The first three Principal Component Analyses (PCAs) explained 50.91% of the data variance showing that the area is structured by two groups: one offshore composed by oligotrophic indicators, and another nearshore influenced by continental fluxes.

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