نتایج جستجو برای: vascular plants

تعداد نتایج: 414142  

Journal: :Nano letters 2014
Wei Gao Xiaomiao Feng Allen Pei Christopher R Kane Ryan Tam Camille Hennessy Joseph Wang

Plant-based bioinspired magnetically propelled helical microswimmers are described. The helical microstructures are derived from spiral water-conducting vessels of different plants, harnessing the intrinsic biological structures of nature. Geometric variables of the spiral vessels, such as the helix diameter and pitch, can be controlled by mechanical stretching for the precise fabrication and c...

Journal: :Sustainability 2021

Plant identification from images has become a rapidly developing research field in computer vision and is particularly challenging due to the morphological complexity of plants. The availability large databases plant images, advancements image processing, pattern recognition machine learning, have resulted number remarkably accurate reliable image-based techniques, overcoming time expertise req...

2014
Michael G. Simpson

BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commer...

Journal: :Proceedings. Biological sciences 2013
Alessandro Desirò Jeffrey G Duckett Silvia Pressel Juan Carlos Villarreal Martin I Bidartondo

Hornworts are considered the sister group to vascular plants, but their fungal associations remain largely unexplored. The ancestral symbiotic condition for all plants is, nonetheless, widely assumed to be arbuscular mycorrhizal with Glomeromycota fungi. Owing to a recent report of other fungi in some non-vascular plants, here we investigate the fungi associated with diverse hornworts worldwide...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2000
K E Holsinger

Differences in the frequency with which offspring are produced asexually, through self-fertilization and through sexual outcrossing, are a predominant influence on the genetic structure of plant populations. Selfers and asexuals have fewer genotypes within populations than outcrossers with similar allele frequencies, and more genetic diversity in selfers and asexuals is a result of differences ...

2016
Daniel E. Stanton Catherine Reeb

Morphometric analysis of organisms has undergone a dramatic renaissance in recent years, embracing a range of novel computational and imaging techniques to provide new approaches to phenotypic characterization. These innovations have often developed piece-meal, and may reflect the taxonomic specializations and biases of their creators. In this review, we aim to provide a brief introduction to a...

Journal: :Science 2009
Philippe Steemans Alain Le Hérissé John Melvin Merrell A Miller Florentin Paris Jacques Verniers Charles H Wellman

Colonization of the land by plants most likely occurred in a stepwise fashion starting in the Mid-Ordovician. The earliest flora of bryophyte-like plants appears to have been cosmopolitan and dominated the planet, relatively unchanged, for some 30 million years. It is represented by fossilized dispersed cryptospores and fragmentary plant remains. In the Early Silurian, cryptospore abundance and...

2017
Sharon A. Robinson Melinda J. Waterman

Whilst light is essential for photosynthesis and development of plants, both excess photosynthetically active radiation and certain wavelengths (e.g. high energy ultraviolet-B) radiation can be damaging. Plants in general possess a suite of mechanisms that act to either prevent absorption of damaging and excess radiation or to mitigate against the damage that such radiation can cause once it is...

Journal: :The Plant cell 2011
Toon Cools Anelia Iantcheva Annika K Weimer Shannah Boens Naoki Takahashi Sara Maes Hilde Van den Daele Gert Van Isterdael Arp Schnittger Lieven De Veylder

A sessile lifestyle forces plants to respond promptly to factors that affect their genomic integrity. Therefore, plants have developed checkpoint mechanisms to arrest cell cycle progression upon the occurrence of DNA stress, allowing the DNA to be repaired before onset of division. Previously, the WEE1 kinase had been demonstrated to be essential for delaying progression through the cell cycle ...

2013
Yujing Yan Xian Yang Zhiyao Tang

Large-scale patterns of species richness and the underlying mechanisms regulating these patterns have long been the central issues in biogeography and macroecology. Phylogenetic community structure is a result of combined effects of contemporary ecological interactions, environmental filtering, and evolutionary history, and it links community ecology with biogeography and trait evolution. The Q...

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