scholarly journals Fine-scale spatial genetic dynamics over the life cycle of the tropical tree Prunus africana

Heredity ◽  
2014 ◽  
Vol 113 (5) ◽  
pp. 401-407 ◽  
Author(s):  
D G Berens ◽  
C Braun ◽  
S C González-Martínez ◽  
E M Griebeler ◽  
R Nathan ◽  
...  
Keyword(s):  
Life Cycle ◽  
Tropical Tree ◽  
Fine Scale ◽  
Prunus Africana

Human disturbance reduces genetic diversity of an endangered tropical tree, Prunus africana (Rosaceae)

2007 ◽  
Vol 9 (2) ◽  
pp. 317-326 ◽  
Author(s):  
Nina Farwig ◽  
Carsten Braun ◽  
Katrin Böhning-Gaese
Keyword(s):  
Genetic Diversity ◽  
Human Disturbance ◽  
Tropical Tree ◽  
Prunus Africana

scholarly journals Are patterns of fine-scale spatial genetic structure consistent between sites within tropical tree species?

PLoS ONE ◽  
2018 ◽  
Vol 13 (3) ◽  
pp. e0193501
Author(s):  
James R. Smith ◽  
Jaboury Ghazoul ◽  
David F. R. P. Burslem ◽  
Akira Itoh ◽  
Eyen Khoo ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Tree Species ◽  
Spatial Genetic Structure ◽  
Tropical Tree ◽  
Fine Scale ◽  
Tropical Tree Species

scholarly journals Fine-scale spatial genetic structure of eight tropical tree species as analysed by RAPDs

Heredity ◽  
2001 ◽  
Vol 87 (4) ◽  
pp. 497-507 ◽  
Author(s):  
Bernd Degen ◽  
Henri Caron ◽  
Eric Bandou ◽  
Laurent Maggia ◽  
Marie Héléne Chevallier ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Tree Species ◽  
Spatial Genetic Structure ◽  
Tropical Tree ◽  
Fine Scale ◽  
Tropical Tree Species

Fine-Scale Genetic Structure of Zamia furfuracea: Variation with Life-Cycle Stages

2017 ◽  
Vol 178 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Pablo Octavio-Aguilar ◽  
Lourdes Georgina Iglesias-Andreu ◽  
Francisco Federico Núñez de Cáceres-González ◽  
Dulce María Galván-Hernández
Keyword(s):  
Life Cycle ◽  
Genetic Structure ◽  
Fine Scale ◽  
Life Cycle Stages

Observations of tropical cyclone inner-core fine-scale structure, and its link to intensity variations

2021 ◽  
Author(s):  
Léo Vinour ◽  
Swen Jullien ◽  
Alexis Mouche ◽  
Clément Combot ◽  
Morgan Mangeas
Keyword(s):  
Life Cycle ◽  
High Resolution ◽  
Tropical Cyclone ◽  
Energy Distribution ◽  
Radial Profile ◽  
Statistical Prediction ◽  
Wave Number ◽  
Cycle Phase ◽  
Strong Wind ◽  
Fine Scale

AbstractTropical Cyclone (TC) internal dynamics have emerged over recent decades as a key to understand their intensity variations, but are difficult to observe, as they are sporadic, multi-scale, and occur in areas of very strong wind gradients. The present work aims at describing the internal structure of TCs, as observed with newly available satellite synthetic aperture radars (SARs) wind products, and at evaluating relations between this structure and the TC life cycle. It is based on a unique dataset of 188 SAR high-resolution (1 km) images, containing 15 to 47 by intensity category. An extraction method is designed to retrieve and characterize, the TC radial profile, its azimuthal degree of asymmetry, and the energy distribution in the eyewall and maximum wind areas. Vortex contraction and sharpening of the eyewall wind radial gradient with increasing TC intensity are observed, as well as a symmetrization of energy distribution around the vortex. Eyewall high wave number structures show a dependence on the life cycle phase, supporting previous findings discussing the vortex rapid evolution with onset and propagation of eyewall mesovortices and associated vortex Rossby wave generation. A machine learning approach finally highlights that the eye shape and eyewall radial wind gradient fine-scale dynamics have the potential to improve the statistical prediction of TC intensity variations, compared to the sole use of vortex averaged parameters and synoptic information. The high-resolution radial and azimuthal coverage provided by SARs make these acquisitions a very valuable tool for TC research and operational application.

scholarly journals A fine‐scale spatial analysis of fungal communities on tropical tree bark unveils the epiphytic rhizosphere in orchids

2021 ◽  
Author(s):  
Remi Petrolli ◽  
Conrado Augusto Vieira ◽  
Marcin Jakalski ◽  
Melissa F. Bocayuva ◽  
Clement Valle ◽  
...  
Keyword(s):  
Spatial Analysis ◽  
Tropical Tree ◽  
Fungal Communities ◽  
Tree Bark ◽  
Fine Scale

High Resolution Stereography of Complementary Freeze-Fracture Replicas Reveals the Presence of Depressions Opposite Membrane Associated Particles of Split Membranes

1971 ◽  
Vol 29 ◽  
pp. 442-443
Author(s):  
Russell L. Steere
Keyword(s):  
High Resolution ◽  
Cardiac Muscle ◽  
Electron Micrographs ◽  
Chromic Acid ◽  
Freeze Fracture ◽  
Distilled Water ◽  
Fine Scale ◽  
Acid Cleaning ◽  
Cleaning Solution

Complementary replicas have revealed the fact that the two common faces observed in electron micrographs of freeze-fracture and freeze-etch specimens are complementary to each other and are thus the new faces of a split membrane rather than the original inner and outer surfaces (1, 2 and personal observations). The big question raised by published electron micrographs is why do we not see depressions in the complementary face opposite membrane-associated particles? Reports have appeared indicating that some depressions do appear but complementarity on such a fine scale has yet to be shown.Dog cardiac muscle was perfused with glutaraldehyde, washed in distilled water, then transferred to 30% glycerol (material furnished by Dr. Joaquim Sommer, Duke Univ., and VA Hospital, Durham, N.C.). Small strips were freeze-fractured in a Denton Vacuum DFE-2 Freeze-Etch Unit with complementary replica tooling. Replicas were cleaned in chromic acid cleaning solution, then washed in 4 changes of distilled water and mounted on opposite sides of the center wire of a Formvar-coated grid.

Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

1989 ◽  
Vol 47 ◽  
pp. 962-963
Author(s):  
Betty Ruth Jones ◽  
Steve Chi-Tang Pan
Keyword(s):  
Nervous System ◽  
Life Cycle ◽  
Schistosoma Mansoni ◽  
Snail Host ◽  
Complex Life Cycle ◽  
Rational Approach ◽  
Effective Control ◽  
The Social ◽  
Social And Economic Development ◽  
Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

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