Reawakening of the beauty: Heliconia montana is distinct from H. venusta (Heliconiaceae)

Phytotaxa ◽  
2019 ◽  
Vol 400 (5) ◽  
pp. 279
Author(s):  
ÁNGELA MORALES-TRUJILLO ◽  
MARÍA DEL PILAR SEPÚLVEDA-NIETO ◽  
LUIS HERNANDO HURTADO TOBÓN ◽  
LILIANA KATINAS ◽  
MARÍA JOSÉ APODACA
Keyword(s):  
Tropical Forests ◽  
Principal Component ◽  
Central Andes ◽  
Morphological Features ◽  
Clear Cut ◽  
Hummingbird Pollination ◽  
Principal Component Analyses

Heliconia montana and H. venusta are endemic to the tropical forests of the Central Andes. They belong to Heliconiaceae, a family recognized by the showy inflorescences of its members and hummingbird pollination. Both species were already established in 1983 but, just a few years later, the name H. montana was synonymized under the name H. venusta. Observations of populations of both species show that they differ by features evident in the field. A floral morphometric and a Principal Component analyses yielded also a clear cut distinction between H. montana and H. venusta. Therefore, Heliconia montana is reinstated here. The morphological features that differentiate H. montana and H. venusta are discussed, presented in a key, and illustrated with photographs.

scholarly journals Fast diffusion kurtosis mapping of human brain at 7 Tesla with hybrid principal component analyses

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Fangrong Zong ◽  
Jiaxin Du ◽  
Xiaofeng Deng ◽  
Xubin Chai ◽  
Yan Zhuo ◽  
...  
Keyword(s):  
Human Brain ◽  
Principal Component ◽  
7 Tesla ◽  
Fast Diffusion ◽  
Principal Component Analyses ◽  
Diffusion Kurtosis

scholarly journals Dimension reduction of Malaria Box data allows efficient compound prioritization

F1000Research ◽  
2016 ◽  
Vol 5 ◽  
pp. 2701
Author(s):  
Gajinder Pal Singh
Keyword(s):  
Specific Activity ◽  
Rank Correlation ◽  
Artemisinin Resistance ◽  
Principal Component ◽  
Principal Component Analyses ◽  
Systematic Strategy ◽  
Positive Correlations ◽  
Further Development ◽  
Malaria Box

Background: New anti-malarial drugs are needed to meet the challenge of artemisinin resistance and to achieve malaria elimination and eradication. The new anti-malarial compounds are expected to have many desirable properties, such as activity against multiple stages of Plasmodium, low host cytotoxicity, and low propensity for resistance development, but whether and how these properties might be linked to each other is not clear. A better understanding of the relationship between activities of compounds against different stages of Plasmodium could help in the development of strategies to prioritize compounds with maximum potential for further development. Methods: We utilized the large amount of data that has recently been generated on 400 anti-malarial Malaria Box compounds and performed statistical analyses, such as rank correlation, hierarchical clustering, and principal-component analyses, to test associations between activities against different stages of Plasmodium, other pathogens, and human cells. Results: We found significant positive correlations between the activities of compounds against different stages of Plasmodium. Our results also show toxicity associated with assays conducted at higher compound concentrations. Principal-component analyses (PCA) of the data allowed differentiation of Plasmodium-specific activity from general toxicity and predicted success in in vitro evolution of resistance. We found that a single principal-component can capture most of the desirable properties of Malaria Box compounds and can be used to rank compounds from most desirable to least desirable activity-profile. Conclusions: Here, we provide a systematic strategy to prioritize Malaria Box compounds for further development. This approach may be applied for prioritization of anti-malarial compounds in general.

scholarly journals The Interaction of the Parent with the Young Child: Structure and Dynamics of Parental Responsiveness

2020 ◽  
Vol 16 (4) ◽  
pp. 72-86
Author(s):  
I.N. Galasyuk ◽  
O.V. Mitina
Keyword(s):  
Parental Behavior ◽  
Principal Component ◽  
Orthogonal Rotation ◽  
Method Evaluation ◽  
Theoretical Justification ◽  
Parental Responsiveness ◽  
Structure And Dynamics ◽  
Child Interaction ◽  
Principal Component Analyses ◽  
The Relationship

The article presents a theoretical justification of the concept of Parental Responsiveness (PR) based on the cultural and historical concept, the activity paradigm and the results of an empirical study, the purpose of which is to operationalize the psychological construct of parental responsiveness and build an explanatory model of the dynamic functioning of parental responsiveness. The study involved 55 mothers with children between the ages of 2.4 and 3.3 years, developing within the norm. The method "Evaluation of child-parent interaction (ECPI)", which provides video surveillance, was used. The data was processed using the Observer XT-14 computer program. The Principal component analyses the method with orthogonal rotation Varimax was used to identify generalizing categories that characterize PR and allows describing their variations. As a result, there were 4 categories (scales) that determine the manifestation of responsiveness by the parent: Dominance, Apathy, Sensitivity, and Support. Their stability was shown in the process of parent-child interaction. A profile of parental responsiveness is constructed for each parent, which determines the extend of each scale when interacting with the child. The developed dynamic multidimensional autoregressive model of Parental Responsiveness allows us to evaluate the dynamics of parental behavior and determine the nature of the relationship between scales during the session.

scholarly journals Not all that clear cut: intraspecific morphological variability inSqualus blainville(Risso, 1827) and implications for identification of the species

2015 ◽  
Vol 96 (8) ◽  
pp. 1585-1596 ◽  
Author(s):  
Juan José Bonello ◽  
Leanne Bonnici ◽  
Alice Ferrari ◽  
Alessia Cariani ◽  
Patrick J. Schembri
Keyword(s):  
Fisheries Management ◽  
Morphological Variability ◽  
Intraspecific Variability ◽  
Morphological Features ◽  
Cytochrome Oxidase Subunit ◽  
Clear Cut ◽  
Management Zone ◽  
Maltese Islands ◽  
Dorsal Fin ◽  
Mtdna Marker

Of the three species of the genusSqualusthat occur in the Mediterranean Sea,S. blainvilleandS. megalopsare very difficult to distinguish. This study assesses the variability in morphological features that have been used to differentiate between these species.Squaluswere collected from stations within the 25-nautical mile Fisheries Management Zone around the Maltese Islands; 349 specimens were dissected and categorized into male and female, mature and immature, and individuals were randomly selected from each category to make up a sample of 169 specimens. For each individual, total length and first dorsal fin parameters were measured, and morphology of denticles isolated from the laterodorsal area, of the upper and lower teeth and of the chondrocranium was analysed. The first dorsal spine was shorter that the fin base in 93% of the specimens, which is typical ofS. megalops; this character was not related to either gender or maturity. Chondrocrania with one lateral process (typical ofS. blainville) and two lateral processes (typical ofS. megalops) were present. Teeth from the same individuals showed morphological features that overlap betweenS. blainvilleandS. megalops. Both unicuspid (typical ofS. megalops) and tricuspid denticles (typical ofS. blainville) were observed on the same individuals. Twelve specimens (six having one and six having two lateral chondrocranial processes) were analysed genetically by sequencing of the mtDNA marker Cytochrome Oxidase Subunit I (COI). All resulted to beS. blainvilleshowing that intraspecific variability in supposedly diagnostic morphological features is large enough to render these unreliable to tell apart these two species, especially in the field.

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