scholarly journals Specialized Adhesive Pad of a Climbing Pteridosperm from Permian Peat-Forming Forest (Wuda, Inner Mongolia)

2020 ◽  
Vol 54 (1-2) ◽  
pp. 23-28
Author(s):  
Zhukun Wang
Keyword(s):  
Inner Mongolia ◽  
Growth Habit ◽  
Coal Field ◽  
Chemical Substances ◽  
Form And Function ◽  
New Finding ◽  
Adhesive Pads ◽  
Cathaysia Flora ◽  
And Function ◽  
Physical Principles

AbstractCertain pteridosperm tendril adhesive pads are depicted from the Cathaysian flora of the Early Permian Taiyuan Formation of Wuda Coal-field in Inner Mongolia China. Specimens contain elliptical or rounded pads situating at the swollen tip of pinnule lobe tendrils which are highly comparable to those of the extant Parthenocissus tricuspidata in the way that both of them are similar in form and function. Specifically, information we have gained suggested that pteridosperms from the Permian might have performed a similar type of physiological process by producing some chemical substances which assisted them in climbing. The Wuda pteridosperm likely to climbed on Cordaites or Sigillaria trees. Moreover, physical principles such as the pressure difference between inside and outside of the pads also seems to play an important role in assisting climbing. The new finding indicates that some pteridosperms in the Permian Cathaysian flora possessed climbing growth habit as well as those in the Late Carboniferous Euramerica Flora, where climbing/scrambling growth habit is well known in the coal swamp forests. This finding shows one of the several earliest climbing habits in Cathaysia Flora and thus remarkably promotes our understanding of the growth habit of pteridosperm and the change in plant community structure in that area.

scholarly journals Notes on a Folio from the Gulshan Album in the Collection of the Náprstek Museum, Prague

2021 ◽  
Vol 42 (1) ◽  
pp. 49-65
Author(s):  
Adriana Stříbrná
Keyword(s):  
The Other ◽  
National Library ◽  
The Czech Republic ◽  
Mughal Empire ◽  
Form And Function ◽  
Introductory Part ◽  
Form Part ◽  
New Finding ◽  
And Function ◽  
The Relationship

In 2015 the Naprstek Museum, in cooperation with the National Library of the Czech Republic, carried out a conservation survey of two rare folios from the Gulshan Album of the Mughal emperor Jahāngīr which form part of the Naprstek Museum’s Indian collection. During the survey an unknown signature by the painter Āqā Rezā was discovered in the border of one of them. The new finding was the impetus for this study, looking at the folio in more detail. In addition to the introductory part, which looks at the form and function of illustrated albums in the Mughal Empire, the study describes in detail both a miniature on one side of the folio and the calligraphy and border with human figures on the other side, and explains the relationship between them.

scholarly journals Topological morphogenesis of neuroepithelial organoids

2021 ◽  
Author(s):  
Keisuke Ishihara ◽  
Arghyadip Mukherjee ◽  
Elena Gromberg ◽  
Jan Brugues ◽  
Elly Tanaka ◽  
...  
Keyword(s):  
Control Parameter ◽  
The Self ◽  
Self Organization ◽  
Quantitative Microscopy ◽  
Epithelial Surface ◽  
Form And Function ◽  
Organ Morphogenesis ◽  
Epithelial Fusion ◽  
And Function ◽  
Physical Principles

Animal organs exhibit complex topologies involving cavities and tubular networks, which underlie their form and function. However, how topology emerges during organ morphogenesis remains elusive. Here, we combine tissue reconstitution and quantitative microscopy to show that trans and cis epithelial fusion govern tissue topology and shape. These two modes of topological transitions can be regulated in neuroepithelial organoids, leading to divergent topologies. The morphological space can be captured by a single control parameter which is analogous to the reduced Gaussian rigidity of an epithelial surface. Finally, we identify a pharmacologically accessible pathway that regulates the frequency of trans and cis fusion, and demonstrate the control of organoid topology and shape. The physical principles uncovered here provide fundamental insights into the self-organization of complex tissues.

Scanning tunneling microscopy (STM) of DNA and RNA

1989 ◽  
Vol 47 ◽  
pp. 34-35
Author(s):  
Patricia G. Arscott ◽  
Gil Lee ◽  
Victor A. Bloomfield ◽  
D. Fennell Evans
Keyword(s):  
Molecular Structures ◽  
Inorganic Materials ◽  
Resolving Power ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Form And Function ◽  
Dna And Rna ◽  
Calf Thymus ◽  
And Function ◽  
The Relationship

STM is one of the most promising techniques available for visualizing the fine details of biomolecular structure. It has been used to map the surface topography of inorganic materials in atomic dimensions, and thus has the resolving power not only to determine the conformation of small molecules but to distinguish site-specific features within a molecule. That level of detail is of critical importance in understanding the relationship between form and function in biological systems. The size, shape, and accessibility of molecular structures can be determined much more accurately by STM than by electron microscopy since no staining, shadowing or labeling with heavy metals is required, and there is no exposure to damaging radiation by electrons. Crystallography and most other physical techniques do not give information about individual molecules.We have obtained striking images of DNA and RNA, using calf thymus DNA and two synthetic polynucleotides, poly(dG-me5dC)·poly(dG-me5dC) and poly(rA)·poly(rU).

Re-examining the form and function of superstition

2011 ◽  
Author(s):  
Scott Fluke ◽  
Russell J. Webster ◽  
Donald A. Saucier
Keyword(s):  
Form And Function ◽  
And Function

A New Form and Function for Personality

2013 ◽  
Author(s):  
Joshua Wilt ◽  
William Revelle
Keyword(s):  
Form And Function ◽  
New Form ◽  
And Function

Ausnahmesegment

2018 ◽  
Vol 48 (191) ◽  
Author(s):  
Barbara Schönig
Keyword(s):  
Welfare State ◽  
Social Housing ◽  
Integrated Approach ◽  
New Paradigm ◽  
Development Models ◽  
Form And Function ◽  
Institutional Organization ◽  
National Welfare ◽  
And Function ◽  
The Welfare State

Going along with the end of the “golden age” of the welfare state, the fordist paradigm of social housing has been considerably transformed. From the 1980s onwards, a new paradigm of social housing has been shaped in Germany in terms of provision, institutional organization and design. This transformation can be interpreted as a result of the interplay between the transformation of national welfare state and housing policies, the implementation of entrepreneurial urban policies and a shift in architectural and urban development models. Using an integrated approach to understand form and function of social housing, the paper characterizes the new paradigm established and nevertheless interprets it within the continuity of the specific German welfare resp. housing regime, the “German social housing market economy”.

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