scholarly journals Distribution et habitats de Newbouldia laevis (P.Beauv.) Seemann ex Bureau et de Dracaena arborea (Willd.) Link dans les zones bioclimatiques du Bénin

2020 ◽  
Vol 14 (8) ◽  
pp. 2903-2927
Author(s):  
Jhonn Logbo ◽  
Paul Yedomonhan ◽  
Brice Tente ◽  
Akpovi Akoegninou
Keyword(s):  
Wide Distribution ◽  
Average Recovery ◽  
Bioclimatic Zone ◽  
The Matrix ◽  
Sacred Forests ◽  
Potential Habitats ◽  
Geographic Distributions ◽  
A Priority

Cette étude a permis de déterminer la distribution et les habitats potentiels de Newbouldia laevis et de Dracaena arborea dans les zones bioclimatiques du Bénin en vue de leur gestion durable. Trente relevés phytosociologiques ont été effectués dans les formations végétales. La matrice obtenue a permis de discriminer les forêts sacrées (74 genres ; 46 familles ; Richesse spécifique=130 ; H=5,92 bits; R=0,97) des champs/jachères (42 genres ; 28 familles ; Richesse spécifique =69; H=3,40 bits; R=0,62). Les densités moyennes de tiges sont passées en forêts sacrées de 64 à 31 et à 0 tiges.ha-1; puis de 28 à 16 tiges.ha-1 dans les champs/jachères chez D. arborea. Chez N. laevis, ces densités sont passées de 30 à 15 puis à 09 tiges.ha-1 en forêts sacrées et de 89 à 56 et à 13 tiges.ha-1 dans les champs/jachères respectivement en zones guinéo-congolaise, soudano-guinéenne et soudanienne. Les phanérophytes et les espèces guinéo-congolaises sont les plus dominants. D. arborea et N. laevis se conservent mieux respectivement en forêts sacrées et en champs/jachères. Leur introduction dans les programmes de reboisement et la protection de leurs habitats potentiels seraient un atout pour leur meilleure conservation et contribueront à formuler des recommandations soutenues pour leur valorisation au Bénin.Mots clés : Bénin, Distribution, Zones bioclimatiques, Newbouldia laevis, Dracaena arborea.   English Title: Distribution and habitats of Newbouldia laevis (P.Beauv.) Seemann ex Bureau and Dracaena arborea (Willd.) Link in the bioclimatic zones of BeninThis study carried out in the three bioclimatic zones of Benin aims to determine the potential habitats and the geographic distributions of Newbouldia laevis and Dracaena arborea, two anthropophilic agroforestry species in order to conserve them sustainably. Thirty phytosociological surveys were sampled and the matrix gotten was subjected to an analysis of the adjusted correspondences (DCA) to discriminate the sacred forests with great diversity (Rf = 130; H = 5.92; R = 0.97) of the fields/fallows of medium diversity (Rf = 69; H = 3.40; R = 0.62) and balanced. The average densities of stems went from 64, 31 and 0 stems.ha-1 in D. arborea to 30, 15 and 09 stems.ha-1 in N. laevis in sacred forests and in fields/fallows from 28, 16 and 0 stems.ha-1 in D. arborea at 89, 56 and 13 stems.ha-1 in N. laevis respectively in guinean-congolese, sudano-guinean and sudanian zones. Phanerophytes constitute 85% of the average recovery in number and occupation of space. Guinean-congolese species are dominant and have a wide distribution spectrum. D. arborea and N. laevis keep better in sacred forests and fields / fallows respectively. The protection of potential habitats and the introduction of species into national reforestation programs as a priority would be an asset for better conservation.Keywords : Benin, Distribution, bioclimatic zone, Newbouldia laevis, Dracaena arborea.    

scholarly journals Experimental study of the construction o tom, čto as a clausal complement of verbs and nouns in non-standard Russian

2020 ◽  
Vol 17 (4) ◽  
pp. 650-671
Author(s):  
Mikhail Yu. Knyazev ◽  
◽  
Valeria S. Zarembo ◽  
◽  
Keyword(s):  
Experimental Study ◽  
Wide Distribution ◽  
Prepositional Phrase ◽  
Prepositional Phrases ◽  
The Matrix ◽  
The Status ◽  
Complement Clauses ◽  
Clausal Complements ◽  
Judgment Data ◽  
Acceptability Judgment

The spread of the complementation construction o tom, čto in non-standard Russian in recent decades has been attested in previous work. It has been established that the construction has a wide distribution and can replace not only ordinary complement clauses introduced by the complementizer čto (so-called čto-clauses), cf. podtverždat’ o tom, čto + p ‘confirm that p’ instead of podtverždat’, čto + p, but also so-called to, čto-clauses (čto-clauses preceded by a demonstrative), including those embedded in prepositional phrases introduced by a preposi- tion other than o, cf. ostanovit’sja o tom, čto + p ‘settle on the fact that p’ instead of ostanovit’sja na tom, čto + p. The construction can also appear as a clausal complement of nouns, cf. podtverždenie o tom, čto + p ‘confirmation that p’ instead of podtverždenie togo, čto + p. The latter uses have been reported to lead to a milder violation, compared to the uses of the con- struction with verbs. The present study tested the latter hypothesis experimentally by using acceptability judgment data. The experiment tested the effect of the subcategorization of the matrix predicate (in standard Russian), i. e., whether it takes a direct object/čto-clause or a prepositional phrase (embedding a to, čto-clause). The findings suggest that there is a contrast in the status of clausal complements of verbs and nouns, specifically, that the latter are not genuine complements as has been earlier suggested in literature.

scholarly journals XXX.—Note on some Fossils from Seymour Island, in the Antarctic Regions, obtained by Dr Donald

1895 ◽  
Vol 37 (4) ◽  
pp. 707-709 ◽  
Author(s):  
G. Sharman ◽  
E. T. Newton
Keyword(s):  
Hydrochloric Acid ◽  
Wide Distribution ◽  
The Other ◽  
Sandy Rock ◽  
The Matrix ◽  
Sandy Material ◽  
Coniferous Wood ◽  
The Antarctic ◽  
Seymour Island

These fossils are especially interesting on account of their having been obtained from a more southerly point than any hitherto recorded. The number of specimens is nine; five of these are referable to the genus Cucullœa, one to Cytherea, one probably to Natica, and two are fragments of Coniferous Wood. With the Cytherea are other small shells which may indicate the presence of Crassatella (?) and Donax (?). Two of the pieces of Cucullœa are entirely free from matrix, while three show in their interiors a fine sandy rock which effervesces when treated with hydrochloric acid. The shells themselves have a calcedonic appearance, but, like the matrix, they effervesce strongly with acid; they are much denuded, having apparently been long exposed to the weather. The matrix within the Cytherea is coarser than that in the Cucullœa, containing, besides fragments of quartz and of a black rock, numerous fragments of shells. The Natica (?) is almost free from matrix, and is much denuded, but in some of the crevices sandy material may be seen very like the matrix of the other shells. All these genera have a wide distribution in time, and are now living, consequently they give but little clue to the age of the rocks in which they were found. Cucullœa is rare at the present day, and the few known species occur in the Mauritius, Nicobar, and China; but as a fossil it is very common and widely distributed.

Atomic Absorption Spectrophotometry of Iron and Aluminum in Baking Powders

1970 ◽  
Vol 53 (4) ◽  
pp. 877-879
Author(s):  
Walter Holak
Keyword(s):  
Organic Matter ◽  
Atomic Absorption ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Method ◽  
Average Recovery ◽  
Absorption Spectrophotometry ◽  
Aluminum Recovery ◽  
Relative Standard ◽  
The Matrix ◽  
Analytical Range

Abstract In an atomic absorption method for iron and aluminum in baking powders, organic matter is destroyed with a mixture of H2SO4-30% H2O2, the sample is diluted to within analytical range, and absorption of each element is measured. Concentrations are obtained from calibration curves prepared from standards diluted in the presence of H2SO4 and alarge amount of alkali; the former compensates for the matrix differences and the latter suppresses the ionization of aluminum. Recovery studies with commercially manufactured baking powders to which known amounts of the elements were added indicate that the method is free of interferences for these products. Average recovery and the relative standard deviation for iron and aluminum are 100.4±1.3% and 98.7±1.8%, respectively.

scholarly journals Multicriteria choice based on a matrix of criteria in assessing the software efficiency of information systems

2020 ◽  
Vol 23 (4) ◽  
pp. 40-44
Author(s):  
A. I. Isakova ◽  
◽  
A. M. Korikov ◽  
S. M. Levin ◽  
◽  
...  
Keyword(s):  
Information Systems ◽  
Efficiency Analysis ◽  
Multicriteria Choice ◽  
The Matrix ◽  
A Priority ◽  
And Control ◽  
Software Efficiency

The problems and methods of multicriteria selection are discussed using the example of software efficiency analysis. The matrix of criteria (priorities) and methods of its construction are considered. The application of a matrix of criteria (priorities) for evaluating the effectiveness of software is proposed. The analysis results for the analogues of software to account and control contracts at an enterprise using a priority matrix are presented.

scholarly journals A Novel low power 2-D to 3-D Array Priority Encoder using Split-Logic Technique for Data Path Applications

2022 ◽  
Vol 17 ◽  
pp. 42-49
Author(s):  
D. S. Shylu Sam ◽  
P. Sam Paul ◽  
Jennifer , Elizah ◽  
Nithyasri Nithyasri ◽  
Snehitha Snehitha ◽  
...  
Keyword(s):  
Low Power ◽  
High Performance ◽  
Matrix Form ◽  
Data Path ◽  
Input File ◽  
Synthesis Tool ◽  
The Matrix ◽  
Simulation Results ◽  
A Priority ◽  
Priority Encoder

In this work, an ascendable low power 64-bit priority encoder is designed using a two-directional array to three-directional array conversion, and Split-logic technique and 6-bit is obtained as the output. By using this method, the high performance priority encoder can be achieved. In the conventional priority encoder, a single bit is set as an input, but for a priority encoder with 3-Darray, every input are specified in the matrix form. The I-bit input file is split hooked on M × N bits, similar to 2-D Matrix. In priority encoder with 3-Darray, three directional output comes out, unlike traditional priority encoder, where the output is received from one direction. The development can be achieved by implementing the two-directional array to three-directional array technique. Simulation results show that the proposed 2-D and 3-D priority encoder consumes 0.087039mW and 0.184014mW which is less when compared with the conventional priority encoder. The priority encoders are simulated and synthesized using VHDL in Xilinx Vivado version 2019.2 and the Oasys synthesis tool.

Crystalloid Inclusions in Hepatocyte Mitochondria and Their Similarity to Cytoplasmic Crystalloids

1974 ◽  
Vol 32 ◽  
pp. 198-199
Author(s):  
Odell T. Minick ◽  
Hidejiro Yokoo
Keyword(s):  
Liver Disease ◽  
Alcoholic Liver Disease ◽  
Special Interest ◽  
Structural Variations ◽  
Mitochondrial Alterations ◽  
The Matrix ◽  
Crystalloid Inclusions ◽  
Liver Biopsies

Mitochondrial alterations were studied in 25 liver biopsies from patients with alcoholic liver disease. Of special interest were the morphologic resemblance of certain fine structural variations in mitochondria and crystalloid inclusions. Four types of alterations within mitochondria were found that seemed to relate to cytoplasmic crystalloids.Type 1 alteration consisted of localized groups of cristae, usually oriented in the long direction of the organelle (Fig. 1A). In this plane they appeared serrated at the periphery with blind endings in the matrix. Other sections revealed a system of equally-spaced diagonal lines lengthwise in the mitochondrion with cristae protruding from both ends (Fig. 1B). Profiles of this inclusion were not unlike tangential cuts of a crystalloid structure frequently seen in enlarged mitochondria described below.

Immune Electron Microscopy (IEM) of a Canine Adeno-Associated Virus

1974 ◽  
Vol 32 ◽  
pp. 256-257
Author(s):  
Gunter F. Thomas ◽  
M. David Hoggan
Keyword(s):  
Electron Microscopy ◽  
Cell Cultures ◽  
Complement Fixation ◽  
Hepatitis Virus ◽  
Wide Distribution ◽  
Immune Electron Microscopy ◽  
Adeno Associated Virus ◽  
Virus Like Particle ◽  
Dog Kidney ◽  
Green Monkeys

In 1968, Sugimura and Yanagawa described a small 25 nm virus like particle in association with the Matsuda strain of infectious canine hepatitis virus (ICHV). Domoto and Yanagawa showed that this particle was dependent on ICHV for its replication in primary dog kidney cell cultures (PDK) and was resistant to heating at 70°C for 10 min, and concluded that it was a canine adeno-associated virus (CAAV). Later studies by Onuma and Yanagawa compared CAAV with the known human serotypes (AAV 1, 2, 3) and AAV-4, known to be associated with African Green Monkeys. Using the complement fixation (CF) test, they found that CAAV was serologically related to AAV-3 and had wide distribution in the dog population of Japan.

Coherency loss in γ' precipitates in nickel-base superalloy

1983 ◽  
Vol 41 ◽  
pp. 244-245
Author(s):  
R. A. Ricks ◽  
Angus J. Porter
Keyword(s):  
Lattice Mismatch ◽  
Lattice Parameter ◽  
Nickel Base Superalloy ◽  
Large Size ◽  
The Matrix ◽  
Nimonic 80A ◽  
Interfacial Dislocations ◽  
Nickel Base ◽  
Coherency Loss ◽  
Nimonic 115

During a recent investigation concerning the growth of γ' precipitates in nickel-base superalloys it was observed that the sign of the lattice mismatch between the coherent particles and the matrix (γ) was important in determining the ease with which matrix dislocations could be incorporated into the interface to relieve coherency strains. Thus alloys with a negative misfit (ie. the γ' lattice parameter was smaller than the matrix) could lose coherency easily and γ/γ' interfaces would exhibit regularly spaced networks of dislocations, as shown in figure 1 for the case of Nimonic 115 (misfit = -0.15%). In contrast, γ' particles in alloys with a positive misfit could grow to a large size and not show any such dislocation arrangements in the interface, thus indicating that coherency had not been lost. Figure 2 depicts a large γ' precipitate in Nimonic 80A (misfit = +0.32%) showing few interfacial dislocations.

Influence of Heat Treatments on Microstructures in an Fe-Co-V Alloy

1974 ◽  
Vol 32 ◽  
pp. 512-513
Author(s):  
S. Mahajan ◽  
M. R. Pinnel ◽  
J. E. Bennett
Keyword(s):  
Single Phase ◽  
Alloy Composition ◽  
Supersaturated Solid Solution ◽  
Cell Formation ◽  
Heat Treatments ◽  
Air Cooling ◽  
Iced Brine ◽  
Transmission Electron ◽  
The Matrix ◽  
Bcc Structure

The microstructural changes in an Fe-Co-V alloy (composition by wt.%: 2.97 V, 48.70 Co, 47.34 Fe and balance impurities, such as C, P and Ni) resulting from different heat treatments have been evaluated by optical metallography and transmission electron microscopy. Results indicate that, on air cooling or quenching into iced-brine from the high temperature single phase ϒ (fcc) field, vanadium can be retained in a supersaturated solid solution (α2) which has bcc structure. For the range of cooling rates employed, a portion of the material appears to undergo the γ-α2 transformation massively and the remainder martensitically. Figure 1 shows dislocation topology in a region that may have transformed martensitically. Dislocations are homogeneously distributed throughout the matrix, and there is no evidence for cell formation. The majority of the dislocations project along the projections of <111> vectors onto the (111) plane, implying that they are predominantly of screw character.

Heterogeneity of Size and Distribution of Intramembrane Particles in the Plasma Membrane of Yeast

1977 ◽  
Vol 35 ◽  
pp. 596-597
Author(s):  
E. Keyhani
Keyword(s):  
Plasma Membrane ◽  
Candida Utilis ◽  
Synthetic Medium ◽  
Freeze Fracture ◽  
Translational Diffusion ◽  
Yeast Cells ◽  
Distilled Water ◽  
Intramembrane Particles ◽  
The Matrix ◽  
Water Cell

The matrix of biological membranes consists of a lipid bilayer into which proteins or protein aggregates are intercalated. Freeze-fracture techni- ques permit these proteins, perhaps in association with lipids, to be visualized in the hydrophobic regions of the membrane. Thus, numerous intramembrane particles (IMP) have been found on the fracture faces of membranes from a wide variety of cells (1-3). A recognized property of IMP is their tendency to form aggregates in response to changes in experi- mental conditions (4,5), perhaps as a result of translational diffusion through the viscous plane of the membrane. The purpose of this communica- tion is to describe the distribution and size of IMP in the plasma membrane of yeast (Candida utilis).Yeast cells (ATCC 8205) were grown in synthetic medium (6), and then harvested after 16 hours of culture, and washed twice in distilled water. Cell pellets were suspended in growth medium supplemented with 30% glycerol and incubated for 30 minutes at 0°C, centrifuged, and prepared for freeze-fracture, as described earlier (2,3).

Sign in / Sign up

Export Citation Format

Share Document