Parsing a plethora of pollen: the role of pollen size and shape in the evolution of Boraginaceae

Cladistics ◽  
2021 ◽  
Author(s):  
Maryam Noroozi ◽  
Farrokh Ghahremaninejad ◽  
David Bogler ◽  
Jocelyn M. Witherspoon ◽  
Gillian L. Ryan ◽  
...  
Keyword(s):  
Pollen Size ◽  
Size And Shape

Superradiance from Two Dimensional Brick-Wall Aggregates of Dye Molecules: The Role of Size and Shape for the Temperature Dependence

2017 ◽  
Vol 119 (9) ◽  
Author(s):  
Alexander Eisfeld ◽  
Christian Marquardt ◽  
Alexander Paulheim ◽  
Moritz Sokolowski
Keyword(s):  
Temperature Dependence ◽  
Brick Wall ◽  
Two Dimensional ◽  
Dye Molecules ◽  
Size And Shape

Helichrysum × kani-isikii (Asteraceae), a new nothospecies from Turkey

Phytotaxa ◽  
2021 ◽  
Vol 507 (4) ◽  
Author(s):  
GÜRKAN SEMİZ ◽  
SERDAR GÖKHAN ŞENOL ◽  
BATIKAN GÜNAL ◽  
MEHMET ÇİÇEK ◽  
VOLKAN EROĞLU
Keyword(s):  
Pollen Size ◽  
Natural Hybrid ◽  
Size And Shape ◽  
First Time

In this study, Helichrysum × kani-isikii (Asteraceae), a new natural hybrid of H. compactum and H. unicapitatum from Babadağ (Denizli, Turkey), is described and investigated in detail for the first time. The new nothospecies is similar to H. compactum and H. unicapitatum, but it has some intermediate morphological and palynological properties that position it between the two putative parents. In the diagnosis of the hybrid, pollen size and shape were found as significant characteristics. Taxonomic, morphological, and palynological characteristics of H. × kani-isikii are compared with those of its putative parents, and some other details are presented with notes on the IUCN category and ecology of the nothospecies. In addition, a key to diagnosing the hybrid from its parental taxa is also provided.

Corrigendum: Dynamical stability of the one-dimensional rigid Brownian rotator: the role of the rotator’s spatial size and shape (2018 J. Phys.: Condens. Matter 30 195304)

2018 ◽  
Vol 30 (27) ◽  
pp. 279502
Author(s):  
Jasmina Jeknić-Dugić ◽  
Igor Petrović ◽  
Momir Arsenijević ◽  
Miroljub Dugić
Keyword(s):  
Dynamical Stability ◽  
One Dimensional ◽  
Size And Shape ◽  
Spatial Size ◽  
The One

Role of sexual and natural selection in evolution of body size and shape: a phylogenetic study of morphological radiation in grouse

2006 ◽  
Vol 19 (4) ◽  
pp. 1083-1091 ◽  
Author(s):  
S. V. DROVETSKI ◽  
S. ROHWER ◽  
N. A. MODE
Keyword(s):  
Body Size ◽  
Natural Selection ◽  
Phylogenetic Study ◽  
Size And Shape

The Role of the Chromophore Size and Shape on the SHG Stability of PMMA Films with Embebbed NLO Active Macrocyclic Chromophores Based on a Cyclotetrasiloxane Scaffold

2011 ◽  
Vol 115 (10) ◽  
pp. 4240-4246 ◽  
Author(s):  
Marco Ronchi ◽  
Alessio Orbelli Biroli ◽  
Daniele Marinotto ◽  
Maddalena Pizzotti ◽  
M. Chiara Ubaldi ◽  
...  
Keyword(s):  
Size And Shape

Pigment granule migration in crustacean photoreceptors requires calcium

1996 ◽  
Vol 13 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Christina King-Smith ◽  
Thomas W. Cronin
Keyword(s):  
Pigment Granule ◽  
Size And Shape ◽  
Pigment Granules ◽  
Gradual Loss ◽  
Light Stimuli ◽  
Pigment Granule Migration ◽  
Normal Calcium

AbstractWe have investigated the role of calcium in the regulation of pigment granule migration in photoreceptors of the semi-terrestrial crab, Sesarma cinereum. Isolated crab eyes (eyecup plus eyestalk) were maintained in crustacean Ringer either prepared normally or calcium-free plus 50 mM EGTA. Pigment granule movement was indirectly observed by monitoring reflectance from the eye during light stimuli using intracellular optical physiological techniques. Electroretinograms (ERGs) were also measured during light stimuli. EGTA treatment caused gradual loss of centripetal migration of pigment granules (normally leading to pupillary closure), and photoreceptors eventually became locked in the open-pupil, dark-adapted state despite repeated stimuli. In contrast, ERG responses continued throughout EGTA treatment, although the size and shape ofthe response was altered. Normal ERG responses and pigment granule movements returned after replacing EGTA-Ringer with normal-calcium medium. These results suggest that centripetal migration of pigment granules in crustacean photoreceptors requires calcium.

Modern Role of the Electron Microscope in Rubber Research

1961 ◽  
Vol 34 (2) ◽  
pp. 697-704 ◽  
Author(s):  
W. A. Ladd ◽  
M. W. Ladd
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Chain Structure ◽  
Main Role ◽  
Size And Shape ◽  
Carbon Gel ◽  
Electron Microscopes ◽  
Particle Size And Shape

Abstract Until recently, the main role of the electron microscope in rubber research was the determination of particle size and shape of reinforcing pigments and fillers. The electron microscope proved its value in its first industrial problem in 1940 when it showed the particle size of Micronex to be 28 mµ. In 1942 it established the correlation between particle size of carbon and rubber properties. The next contribution was the establishment of reticulate chain structure, in 1945, using stereo-photomicrography. The electron microscope led the way to the carbon gel concept when carbons producing different road wear results were shown to have equal particle size and structure. Micrographs of carbon gel were published in 1951. Studies of rubber latexes, various pigments and fillers were also applications of the electron microscope in which the determination of particle size and shape was involved. Today, improvements in resolution, development of new techniques and accessory equipment have greatly expanded the application of the electron microscope. This paper is concerned mainly with describing these new developments ; first, as a help to electron microscopists in the rubber field; second, to illustrate what can be done with the electron microscope, so that research and production men can recognize possible applications of this discerning tool to the solution of their problems. Electron microscopes have come a long way in the short 20-year period. Figure 1 shows the microscope used in our laboratories. This instrument is currently resolving detail as fine as 10 A or 1 mµ in routine daily operation. Its design makes possible the development of special holders and thereby increases its value as a research tool. Another piece of equipment that is as important in microscope research as the electron microscope itself is the evaporating unit shown in Figure 2. This is used for shadowing and forming replication films under vacuum, thus making possible studies of rubber surfaces and surfaces of pigments and other rubber ingredients. In shadowing, detail is made visible by coating the specimen with metal evaporated at an angle from the tungsten basket at A. Carbon can be evaporated by the arc at B, forming a replicating film or mold of the specimen. This will be discussed under “preparation”. Today, the proper preparation of specimens is the most important step in successful microscopy. The various preparations used are as follows.

Interaction of imidazolium based ionic liquids with Triton X-100 micelles: investigating the role of the counter ion and chain length

RSC Advances ◽  
2016 ◽  
Vol 6 (43) ◽  
pp. 36314-36326 ◽  
Author(s):  
Khushbu Thakkar ◽  
Vijay Patel ◽  
Debes Ray ◽  
Haridas Pal ◽  
Vinod K. Aswal ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Chain Length ◽  
Size And Shape ◽  
Counter Ion ◽  
Triton X ◽  
Selection Of

Size and shape of Triton X-100 micelles can easily be controlled by the appropriate selection of ionic liquids with varying hydrophobicity.

scholarly journals Role of lncRNAs in health and disease--size and shape matter

2014 ◽  
Vol 14 (2) ◽  
pp. 115-129 ◽  
Author(s):  
V. Mohanty ◽  
Y. Gokmen-Polar ◽  
S. Badve ◽  
S. C. Janga
Keyword(s):  
Size And Shape ◽  
Health And Disease
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