Pollen dispersal and representation of the “Forest Island” within the Chinese desert-loess transitional zone

2019 ◽  
Vol 263 ◽  
pp. 134-146 ◽  
Author(s):  
Dandan Li ◽  
Yuzhen Ma ◽  
Hongwei Meng ◽  
Chao Guo ◽  
Caili Hu ◽  
...  
Keyword(s):  
Pollen Dispersal ◽  
Transitional Zone ◽  
Forest Island

Analysis and lattice imaging of a transitional event on garnets

1978 ◽  
Vol 36 (1) ◽  
pp. 270-271
Author(s):  
J.Y. Laval
Keyword(s):  
Yttrium Iron Garnet ◽  
Reciprocal Lattice ◽  
Transitional Zone ◽  
Lattice Imaging ◽  
Yttrium Iron ◽  
X Ray ◽  
Ionic Process ◽  
The Matrix ◽  
High Resolution Technique ◽  
Iron Garnet

The exsolution of magnetite from a substituted Yttrium Iron Garnet, containing an iron excess may lead to a transitional event. This event is characterized hy the formation of a transitional zone at the center of which the magnetite nucleates (Fig.1). Since there is a contrast between the matrix and these zones and since selected area diffraction does not show any difference between those zones and the matrix in the reciprocal lattice, it is of interest to analyze the structure of the transitional zones.By using simultaneously different techniques in electron microscopy, (oscillating crystal method microdiffraction and X-ray microanalysis)one may resolve the ionic process corresponding to the transitional event and image this event subsequently by high resolution technique.

Study on floral traits and seed setting in parental lines of hybrid rice during early ahu and kharif seasons

2018 ◽  
Vol 78 (3) ◽  
Author(s):  
Aradhana Phukan ◽  
P. K. Barua ◽  
D. Sarma ◽  
S. D. Deka
Keyword(s):  
Seed Set ◽  
Flag Leaf ◽  
Pollen Dispersal ◽  
Pollen Sterility ◽  
Leaf Length ◽  
Floral Traits ◽  
Opening Angle ◽  
Leaf Angle ◽  
Seed Setting ◽  
Parental Lines

Two CMS lines, IR 58025A and IR 68888A along with their maintainers and two fertility restorers, LuitR and IR 36R, were evaluated for flower and plant characters during early ahu (February-June) and kharif (July-November) seasons. IR 58025A showed longer stigmata and styles, and higher spikelet Length/Breadth (L/B) ratio while IR 68888A showed broader stigmata and wider glume opening angle in both the seasons. IR 68888A also exhibited higher pollen sterility during early ahu. IR 36R was characterized with broad anthers. LuitR showed longer and broader anthers with more pollen than others. Plant height, flag leaf length, flag leaf width and area were higher in IR 36R. Panicle exsertion was complete in pollen parents whereas it was 78-80% in CMS lines. The widest flag leaf angle was found in IR 58025B during early Ahu and in IR 36R during kharif. Kharif season was more favourable for growth of the plants with higher seed set percentage while floral traits of the CMS lines were better expressed in early Ahu. Manipulation of the seeding sequence of the parental lines in early Ahu is warranted for better seed set provided the seed crop escapes heavy premonsoon showers during reproductive stage. IR 68888A/LuitR was a good combination for pollen dispersal and seed setting.

scholarly journals Analysis of Genetic Structure and Dispersal Patterns in a Population of Sea Beet

Genetics ◽  
1998 ◽  
Vol 149 (4) ◽  
pp. 1975-1985
Author(s):  
Jarle Tufto ◽  
Alan F Raybould ◽  
Kjetil Hindar ◽  
Steinar Engen
Keyword(s):  
Equilibrium Distribution ◽  
Pollen Dispersal ◽  
Migration Pattern ◽  
Likelihood Ratio Tests ◽  
Frequency Data ◽  
Gene Frequencies ◽  
Dispersal Patterns ◽  
Parametric Bootstrapping ◽  
Estimated Parameters ◽  
Multivariate Stochastic Process

Abstract A model of the migration pattern in a metapopulation of sea beet (Beta vulgaris L. ssp. maritima), based on the continuous distributions of seed and pollen movements, is fitted to gene frequency data at 12 isozyme and RFLP loci by maximum likelihood by using an approximation of the simultaneous equilibrium distribution of the gene frequencies generated by the underlying multivariate stochastic process of genetic drift in the population. Several alternative restrictions of the general model are fitted to the data, including the island model, a model of complete isolation, and a model in which the seed and pollen dispersal variances are equal. Several likelihood ratio tests between these alternatives are performed, and median bias in the estimated parameters is corrected by using parametric bootstrapping. To assess the fit of the selected model, the predicted covariances are compared with covariances computed from the data directly. The dependency of estimated parameters on the ratio between effective and absolute subpopulation sizes, which is treated as a known parameter in the analysis, is also examined. Finally, we note that the data also appear to contain some information about this ratio.

scholarly journals Hide-and-Seek with Tiny Neotenic Beetles in One of the Hottest Biodiversity Hotspots: Towards an Understanding of the Real Diversity of Jurasaidae (Coleoptera: Elateroidea) in the Brazilian Atlantic Forest

Biology ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 420
Author(s):  
Gabriel Biffi ◽  
Simone Policena Rosa ◽  
Robin Kundrata
Keyword(s):  
Atlantic Forest ◽  
Field Research ◽  
Transitional Zone ◽  
Biodiversity Hotspot ◽  
Biodiversity Hotspots ◽  
Brazilian Atlantic Forest ◽  
Life Stages ◽  
Adult Males ◽  
Undescribed Species ◽  
First Time

Jurasaidae are a family of neotenic elateroid beetles which was described recently from the Brazilian Atlantic Forest biodiversity hotspot based on three species in two genera. All life stages live in the soil, including the larviform females, and only adult males are able to fly. Here, we report the discovery of two new species, Jurasai miraculum sp. nov. and J. vanini sp. nov., and a new, morphologically remarkable population of J. digitusdei Rosa et al., 2020. Our discovery sheds further light on the diversity and biogeography of the group. Most species of Jurasaidae are known from the rainforest remnants of the Atlantic Forest, but here for the first time we report a jurasaid species from the relatively drier Atlantic Forest/Caatinga transitional zone. Considering our recent findings, minute body size and cryptic lifestyle of all jurasaids, together with potentially high numbers of yet undescribed species of this family from the Atlantic Forest and possibly also other surrounding ecoregions, we call for both field research in potentially suitable localities as well as for a detailed investigation of a massive amount of already collected but still unprocessed materials deposited in a number of Brazilian institutes, laboratories and collections.

scholarly journals High Cortico-Trabecular Transitional Zone Porosity and Reduced Trabecular Density in Men and Women with Stress Fractures

2021 ◽  
Vol 10 (5) ◽  
pp. 1123
Author(s):  
Afrodite Zendeli ◽  
Minh Bui ◽  
Lukas Fischer ◽  
Ali Ghasem-Zadeh ◽  
Wolfgang Schima ◽  
...  
Keyword(s):  
Lower Limb ◽  
Quantitative Computed Tomography ◽  
Distal Tibia ◽  
Transitional Zone ◽  
Peripheral Quantitative Computed Tomography ◽  
Stress Fractures ◽  
Cross Sectional ◽  
Men And Women ◽  
Trabecular Microstructure ◽  
Trabecular Density

To determine whether stress fractures are associated with bone microstructural deterioration we quantified distal radial and the unfractured distal tibia using high resolution peripheral quantitative computed tomography in 26 cases with lower limb stress fractures (15 males, 11 females; mean age 37.1 ± 3.1 years) and 62 age-matched healthy controls (24 males, 38 females; mean age 35.0 ± 1.6 years). Relative to controls, in men, at the distal radius, cases had smaller cortical cross sectional area (CSA) (p = 0.012), higher porosity of the outer transitional zone (OTZ) (p = 0.006), inner transitional zone (ITZ) (p = 0.043) and the compact-appearing cortex (CC) (p = 0.023) while trabecular vBMD was lower (p = 0.002). At the distal tibia, cases also had a smaller cortical CSA (p = 0.008). Cortical porosity was not higher, but trabecular vBMD was lower (p = 0.001). Relative to controls, in women, cases had higher distal radial porosity of the OTZ (p = 0.028), ITZ (p = 0.030) not CC (p = 0.054). Trabecular vBMD was lower (p = 0.041). Distal tibial porosity was higher in the OTZ (p = 0.035), ITZ (p = 0.009), not CC. Stress fractures are associated with compromised cortical and trabecular microstructure.

The Urban Spatial Pattern of the Pseudo-Colonial City in Southeast Asia: A Case Study of the Eastern Area of Bangkok, Thailand, during the Thai-Imperialism Period (1855-1932)

2021 ◽  
pp. 009614422110129
Author(s):  
Nicha Tantivess ◽  
David J. Edelman
Keyword(s):  
Rural Communities ◽  
Educational Development ◽  
Transitional Zone ◽  
Administrative Reform ◽  
Urban Transformation ◽  
Urban Spaces ◽  
Eastern Area ◽  
Commercial Center ◽  
Administrative Center

This article discusses the urban spaces of the pseudo-colonial city via the urban transformation in the eastern area of Bangkok between 1855 and 1932. During this period, the Thai royal government was under pressure from colonialism in the Southeast Asian region. To prevent colonization of the country, the kings aimed to strengthen their economic and political powers through administrative reform, educational development, infrastructure construction, and land commodification Thus, the urban spaces in Bangkok were significantly transformed. The eastern area became a transitional zone between the administrative center of the royal government and the commercial center where foreign traders resided. Furthermore, this transitional zone continued expanding into the area of rural communities, and, consequently, the traditional settlements of the local people gradually lost population.

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