scholarly journals Mericarp micromorphology and anatomy of Salvia hedgeana Dönmez, S. huberi Hedge and S. rosifolia Sm. (section Salvia Hedge, Lamiaceae)

2011 ◽  
Vol 70 (1) ◽  
pp. 65-80 ◽  
Author(s):  
Hatice Büyükkartal ◽  
Ahmet Kahraman ◽  
Hatice Çölgeçen ◽  
Musa Doğan ◽  
Ersin Karabacak
Keyword(s):  
Width Ratio ◽  
Sem And Tem ◽  
Micromorphology And Anatomy

Mericarp micromorphology and anatomy ofSalvia hedgeanaDönmez,S. huberiHedge andS. rosifoliaSm. (sectionSalviaHedge, Lamiaceae)Mericarp (nutlet) micromorphology and pericarp structure of three morphologically similar endemicSalviaspecies;Salvia hedgeana, S. huberiandS. rosifoliawere investigated using LM, SEM and TEM.Salvia hedgeanahas larger mericarps and abscission scars thanS. huberiandS. rosifolia. Mericarp length to width ratio ranges from 1.11 inS. hedgeanato 1.60 inS. huberi. Mericarp shape is mainly ovoid, rarely broadly ovoid inS. hedgeana, and oblong inS. huberi. The mericarp surface sculpturing pattern in all species is colliculate. However, exocarp cells are pentangular-hexangular inS. hedgeana, irregular inS. huberiand rounded and smaller inS. rosifolia. InSalvia huberianticlinal walls are undulate whereas inS. hedgeanaandS. rosifoliaanticlinal walls are straight.Salvia hedgeanawas distinguished from the others by the thickest pericarp (146-185 μm). The sclerenchymatous region significantly varied between the species. It was 84-99 μm inS. hedgeana, 56-82 μm inS. huberiand 27-61 μm inS. rosifolia. The mesocarp was also thicker inS. hedgeana. The wetted mericarps produced mucilage, butS. huberidiffered from the others in having translucent-milky white opaque mucilage with fibres or radiating cordons.

SEM and TEM observations of sperm development in the testis of the freshwater fish Oreochromis mossambicus

1990 ◽  
Vol 48 (3) ◽  
pp. 58-59
Author(s):  
Daryl A. Cornish ◽  
George L. Smit
Keyword(s):  
Morphological Characteristics ◽  
Oreochromis Mossambicus ◽  
Breeding Cycle ◽  
Limited Information ◽  
North West ◽  
The North ◽  
Sem And Tem ◽  
Sperm Development ◽  
Ultrastructural Characteristics ◽  
The University

Oreochromis mossambicus is currently receiving much attention as a candidater species for aquaculture programs within Southern Africa. This has stimulated interest in its breeding cycle as well as the morphological characteristics of the gonads. Limited information is available on SEM and TEM observations of the male gonads. It is known that the testis of O. mossambicus is a paired, intra-abdominal structure of the lobular type, although further details of its characteristics are not known. Current investigations have shown that spermatids reach full maturity some two months after the female becomes gravid. Throughout the year, the testes contain spermatids at various stages of development although spermiogenesis appears to be maximal during November when spawning occurs. This paper describes the morphological and ultrastructural characteristics of the testes and spermatids.Specimens of this fish were collected at Syferkuil Dam, 8 km north- west of the University of the North over a twelve month period, sacrificed and the testes excised.

The morphology and ultrastructure of pollen grains of Scutasporites nanuki Utting (Sashiniaceae, Coniferales) from the Permian of the East-European Platform

Palaeobotany ◽  
2012 ◽  
Vol 3 ◽  
pp. 5-11
Author(s):  
A. V. Gomankov ◽  
V. F. Tarasevich
Keyword(s):  
East European Platform ◽  
Central Body ◽  
Pollen Grains ◽  
Irregular Shape ◽  
East European ◽  
Sem And Tem

Dispersed bisaccate pollen grains of Scutasporites nanuki were studied by means of LM, SEM and TEM. Sacci ultrastructure of these pollen grains was rather peculiar. Sacci were like a thin fi lmy fringe attached to the central body near the equator. They were fi lled with sporopollenin elements of irregular shape and various dimensions with equally various cavities between them. Such an ultrastructure is called as spongy. The morphology and ultrastructure of S. nanuki is discussed in the context of the evolution of early conifers.

A SIMPLIFIED ANALYTICAL PROCEDURE FOR SEISMIC ANALYSIS OF TIMBER LIGHT-FRAME SHEAR WALLS

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 173-180
Author(s):  
Giorgia Di Gangi ◽  
Giorgio Monti ◽  
Giuseppe Quaranta ◽  
Marco Vailati ◽  
Cristoforo Demartino
Keyword(s):  
Analytical Procedure ◽  
Seismic Analysis ◽  
Shear Walls ◽  
Element Model ◽  
Sensitivity Analyses ◽  
Width Ratio ◽  
Damping Factor ◽  
Equivalent Viscous Damping ◽  
Design Variables ◽  
Depth Analysis

The seismic performance of timber light-frame shear walls is investigated in this paper with a focus on energy dissipation and ductility ensured by sheathing-to-framing connections. An original parametric finite element model has been developed in order to perform sensitivity analyses. The model considers the design variables affecting the racking load-carrying capacity of the wall. These variables include aspect ratio (height-to-width ratio), fastener spacing, number of vertical studs and framing elements cross-section size. A failure criterion has been defined based on the observation of both the global behaviour of the wall and local behaviour of fasteners in order to identify the ultimate displacement of the wall. The equivalent viscous damping has been numerically assessed by estimating the damping factor which is in use in the capacity spectrum method. Finally, an in-depth analysis of the results obtained from the sensitivity analyses led to the development of a simplified analytical procedure which is able to predict the capacity curve of a timber light-frame shear wall.

Seed Width to Pod Width Ratio for Identification of Green Soybean Pods that have Attained Maximum Length and Width 1

Crop Science ◽  
1982 ◽  
Vol 22 (3) ◽  
pp. 463-466
Author(s):  
S. Rodriguez de Cianzio ◽  
S. J. Frank ◽  
W. R. Fehr
Keyword(s):  
Maximum Length ◽  
Width Ratio ◽  
Seed Width

Flexural-Torsional Buckling of Pultruded Fiber-Reinforced Polymer Angle Beams under Eccentric Loading

2020 ◽  
Vol 982 ◽  
pp. 201-206
Author(s):  
Jaksada Thumrongvut ◽  
Natthawat Pakwan ◽  
Samaporn Krathumklang
Keyword(s):  
Buckling Load ◽  
Fiber Reinforced Polymer ◽  
Width Ratio ◽  
Fiber Reinforced ◽  
Torsional Buckling ◽  
Eccentric Load ◽  
Buckling Loads ◽  
Reinforced Polymer ◽  
Cross Sectional Dimension ◽  
Flexural Torsional Buckling

In this paper, the experimental study on the pultruded fiber-reinforced polymer (pultruded FRP) angle beams subjected to transversely eccentric load are presented. A summary of critical buckling load and buckling behavior for full-scale flexure tests with various span-to-width ratios (L/b) and eccentricities are investigated, and typical failure mode are identified. Three-point flexure tests of 50 pultruded FRP angle beams are performed. The E-glass fibre/polyester resin angle specimens are tested to examine the effect of span-to-width ratio of the beams on the buckling responses and critical buckling loads. The angle specimens have the cross-sectional dimension of 76x6.4 mm with span-to-width ratios, ranging from 20 to 40. Also, four different eccentricities are investigated, ranging from 0 to ±2e. Eccentric loads are applied below the horizontal flange in increments until beam buckling occurred. Based upon the results of this study, it is found that the load and mid-span vertical deflection relationships of the angle beams are linear up to the failure. In contrast, the load and mid-span lateral deflection relationships are geometrically nonlinear. The general mode of failure is the flexural-torsional buckling. The eccentrically loaded specimens are failed at critical buckling loads lower than their concentric counterparts. Also, the quantity of eccentricity increases as buckling load decreases. In addition, it is noticed that span-to-width ratio increases, the buckling load is decreased. The eccentric location proved to have considerable influence over the buckling load of the pultruded FRP angle beams.

scholarly journals SEM and TEM Cross-section films Study of Chrysanthemum leucanthemum (Asteraceae) Pollen from Costa Rica

2021 ◽  
Vol 27 (S1) ◽  
pp. 1722-1723
Author(s):  
Guillermina González-Mancera ◽  
Laura E. Gómez-Lizarraga ◽  
Joaquin Morales-García
Keyword(s):  
Costa Rica ◽  
Cross Section ◽  
Sem And Tem ◽  
Chrysanthemum Leucanthemum

scholarly journals SEM and TEM for identification of capsular fibrosis and cellular behavior around breast implants – a descriptive analysis

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Britta Kuehlmann ◽  
Isabel Zucal ◽  
Clark Andrew Bonham ◽  
Lydia-Marie Joubert ◽  
Lukas Prantl
Keyword(s):  
Descriptive Analysis ◽  
Breast Implants ◽  
Foreign Body Response ◽  
Future Research ◽  
Cellular Mechanisms ◽  
Tem Analysis ◽  
Capsular Fibrosis ◽  
Sem And Tem ◽  
Post Operation ◽  
Bacterial Accumulation

Abstract Background Capsular fibrosis (CF) is the most common long-term complication in implant-based breast augmentation. It is well accepted that the foreign body response (FBR) instigates the development of fibrotic disease. Our study aims to compare murine and human samples of CF and describe the cellular and extracellular matrix (ECM) composition using scanning and transmission electron microscopy (SEM and TEM). Results Miniature microtextured silicone breast implants were implanted in mice and subsequently harvested at days 15, 30, and 90 post-operation. Isolated human capsules with the most aggravated form of CF (Baker IV) were harvested post-operation. Both were analyzed with SEM and TEM to assess cellular infiltration and ECM structure. An architectural shift of collagen fiber arrangement from unidirectional to multidirectional was observed at day 90 when compared to days 15 and 30. Fibrosis was observed with an increase of histiocytic infiltration. Moreover, bacterial accumulation was seen around silicone fragments. These findings were common in both murine and human capsules. Conclusions This murine model accurately recapitulates CF found in humans and can be utilized for future research on cellular invasion in capsular fibrosis. This descriptive study helps to gain a better understanding of cellular mechanisms involved in the FBR. Increases of ECM and cellularity were observed over time with SEM and TEM analysis.

scholarly journals Utilisation of distally based sural fasciocutaneous flaps in lower extremity reconstruction: a single-centre experience with 88 paediatric patients

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Zhaobiao Luo ◽  
Jiangdong Ni ◽  
Guohua Lv ◽  
Jianwei Wei ◽  
Lihong Liu ◽  
...  
Keyword(s):  
Risk Factors ◽  
Potential Risk ◽  
Donor Site ◽  
Width Ratio ◽  
Partial Necrosis ◽  
Paediatric Patients ◽  
Skin Island ◽  
Potential Risk Factors ◽  
Lower Extremity Reconstruction ◽  
Distally Based

Abstract Background No large series have analysed distally based sural fasciocutaneous (DBSF) flaps in paediatric patients. The aims of this study were to assess the reliability and analyse the potential risk factors for these flaps and to describe complications in the donor site and the functional follow-up results. Methods Between June 2002 and November 2017, 88 DBSF flaps were used to reconstruct soft tissue defects in paediatric patients. Potential risk factors, reconstruction outcomes, and complications in the donor site of the flaps were analysed. Results Among the 88 flaps, partial necrosis developed in 8 flaps (9.1%). The partial necrosis rate was significantly higher in flaps with the top edge located in the 9th zone (26.1%), with a length-width ratio (LWR) ≥ 5:1 (28.6%), and with a dimension of the skin island ≥ 100 cm2 (22.7%). Partial necrosis did not occur in flaps with a dimension of the skin island < 80.0 cm2 or with a skin-island width < 7.0 cm. The reconstruction outcomes in most paediatric patients were evaluated as “excellent” or “good”. The incidence of obvious scarring was higher in the donor site. Conclusions Partial necrosis of DBSF flaps will significantly increase when the top edge of the flap is located in the 9th zone, when the LWR of the flap is ≥ 5:1, or when the dimension of the skin island is ≥ 100.0 cm2. Flaps with a skin-island width < 7.0 cm or with a dimension of the skin island < 80 cm2 are relatively safe and reliable.

scholarly journals Diversity of Pod Shape in Pisum

Diversity ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 203
Author(s):  
Thomas Henry Noel Ellis ◽  
Julie M. I. Hofer ◽  
Eleni Vikeli ◽  
Michael J. Ambrose ◽  
Paola Higuera-Poveda ◽  
...  
Keyword(s):  
Allelic Variation ◽  
Size Variation ◽  
Width Ratio ◽  
Negative Regulators ◽  
Wide Range ◽  
Yield Determination ◽  
Organ Specific ◽  
Length Width ◽  
End Use ◽  
Pod Length

The seed-containing pod is the defining structure of plants in the legume family, yet pods exhibit a wide range of morphological variation. Within a species pod characters are likely to be correlated with reproductive strategy, and within cultivated forms will correspond to aspects of yield determination and/or end use. Here variation in pod size, described as pod length: pod width ratio, has been analyzed in pea germplasm represented by 597 accessions. This pod size variation is discussed with respect to population structure and to known classical pod morphology mutants. Variability of the pod length: width ratio can be explained by allelic variation at two genetic loci that may correspond to organ-specific negative regulators of growth.

Sign in / Sign up

Export Citation Format

Share Document