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Registros recuperados: 241
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Inter-Tunneling Mechanism of Colliding Population Waves Nature Precedings
Lev V. Kalmykov; Vyacheslav L. Kalmykov.
Here we show a new interaction mechanism of colliding population waves. It provides a stable coexistence of two similar but different species competing for the same limiting resource during their asexual propagation in a limited homogeneous environment under constant conditions. The revealed mechanism opens new opportunities in conservation biology.
Tipo: Manuscript Palavras-chave: Ecology; Bioinformatics; Plant Biology; Evolutionary Biology.
Ano: 2012 URL: http://precedings.nature.com/documents/6990/version/1
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Intra-specific variation in plant hydraulic sectoriality along a latitudinal gradient Nature Precedings
Angela Zeng; Roberto Salguero-Gomez; Agustin Santos-Alvarez; Amy Zanne; Brenda Casper.
High temperatures and nutrient limitations in deserts challenge plant survival. Large temperature oscillations and droughts typical of cold deserts can result in cavitation, the precipitation of dissolved air within a xylem vessel. If xylem vessels are closely packed, then a cavitation event may expand to neighboring vessels, resulting in runaway embolism, and potentially paralyze the vital functions of the plant.
 Hydraulic sectoriality, where the plant is functionally composed of independent hydraulic units, has been suggested as a strategy to decrease the risk associated with cavitation. This can occur by increasing xylem vessel isolation and/or increasing the physical modularity of the plant. Furthermore, hydraulic sectoriality...
Tipo: Poster Palavras-chave: Ecology; Plant Biology; Evolutionary Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/5277/version/1
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Is there a Weed Shift in Roundup Ready Maize? Nature Precedings
Arnd Verschwele.
The cultivation of transgenic glyphosate-resistant crop varieties can simplify weed control in crops such as maize and others. On the other hand, the repeated use of broadly effective herbicides like glyphosate, especially in the same crop, can have a negative effect on biodiversity. Additionally there is a risk for a spread of more tolerant or even resistant weed species.

It was the aim of a 6-years field study (2003-2008) to investigate weed effects of use of glyphosate in a continuous transgenic herbicide-resistant maize rotation at three sites in Germany. These sites differed significantly in terms of soil, climate and initial weed spectrum. The studies focussed on the comparison between local herbicide standards and...
Tipo: Poster Palavras-chave: Biotechnology; Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/4527/version/1
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Isolation of Acidic, Basic and Neutral Metalloproteins by QPNC-PAGE Nature Precedings
Bernd Kastenholz; David E. Garfin.
A standard protocol for isolating metalloproteins in complex biological samples is presented using quantitative preparative native continuous polyacrylamide gel electrophoresis (QPNC-PAGE)
Tipo: Manuscript Palavras-chave: Biotechnology; Chemistry; Pharmacology; Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/4617/version/1
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Isolation of new racemic sugar (D/L galacturonic acid) from leaves of Paederia foetida Linn. Nature Precedings
Vikas Kumar; Yadav Pankajkumar S; Udaya Pratap Singh; Hans Raj Bhatt; Kamaruz Zaman; Md. Ali.
New racemic sugars (D/L galacturonic acid) were isolate from the leaves of Paederia foetida Linn by the column chromatography. Identification of these isolated compound achieved by TLC, 1H-NMR, 13C-NMR, FTIR and Mass spectral data.
Tipo: Manuscript Palavras-chave: Chemistry; Plant Biology.
Ano: 2011 URL: http://precedings.nature.com/documents/5752/version/1
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Laboratory and field evaluation for the resistance of commonly used woods against _Coptotermes heimi_ (Wasmann). Nature Precedings
Farkhanda Manzoor; Nadeem Sheikh; Asma Zawar.
The current study was conducted to evaluate the resistance of four wood species (_Azadirachta indica_, _Pinus roxberghii_, _Dalbergia sissoo_ and _Populus deltoides_) against subterranean termite species _Coptotermes heimi_ by choice and no choice field and laboratory trials. Of these four wood species _P. roxberghii_ and _D. sissoo_ proved to be most resistant to termite attack. Taken together these results we can conclude that _D. sissoo_ is the least preferred and _P. deltoides_ is the most preferred wood by the _C. heimi_. The data obtained from the field choice and no-choice the woods are arranged in order of preference DS>PR>AI>PD whereas in laboratory choice and no-choice trials the order of preference was...
Tipo: Manuscript Palavras-chave: Ecology; Earth & Environment; Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/4485/version/1
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Ligand induced cleavage and nuclear localization of the rice XA21 immune receptor Nature Precedings
Chang-Jin Park; Pamela C. Ronald.
The rice XA21 receptor confers immunity to the Gram-negative bacterial pathogen, _Xanthomonas oryzae_ pv. _oryzae_ (_Xoo_) upon recognition of the conserved microbial signature AxY^S^22. Here, we demonstrate that the intracellular kinase domain of XA21 translocates to the nucleus upon AxY^S^22-mediated perception and that this translocation event is required for XA21-mediated immunity.
Tipo: Manuscript Palavras-chave: Plant Biology.
Ano: 2012 URL: http://precedings.nature.com/documents/6776/version/1
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Long-term Benefits of GM crops: Potential for Diabrotica Suppression in Europe using Bt Maize Nature Precedings
Nicholas P. Storer; Peter Schlotter; Kevin L. Steffey.
Transgenic crops producing insecticidal proteins from _Bacillus thuringiensis_ (Bt) have been widely adopted since 1996 in the United States of America to combat important pests of maize and cotton. There is growing evidence that several target pest populations have been dramatically reduced in areas where the Bt crops have been most intensively adopted over multiple years. The evidence is most dramatic for nonmigratory monophagous and oligophagous species that show high mortality on Bt crops, such as European corn borer (_Ostrinia nubilalis_), and tobacco budworm (_Heliothis virescens_). Bt cotton is currently being used in the southwestern USA as part of an area-wide eradication program for pink bollworm (_Pectinophora gossypiella_). Single, stacked, and...
Tipo: Poster Palavras-chave: Biotechnology; Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/4447/version/1
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Mass Cultivation of _Chroococcus turgidus_ and _Oscillatoria sp._ and Effective Harvesting of Biomass by Low-cost methods Nature Precedings
Mohan N; Hanumantha Rao P; Ranjith Kumar R; Sivasubramanian V.
The potential of microalgal biomasses for the production of biochemicals such as pigments, vitamins, antibiotics, polysaccharides, proteins, essential fatty acids, bio-flocculants, enzymes, etc. is well known. The purpose of this study was to cultivate two cyanobacterial species namely _Chroococcus turgidus_ and _Oscillatoria sp._, isolated from industrial effluents, using a suitable growth medium in a large-scale High Rate Algal (HRA) pond. The biomolecules such as total protein, total carbohydrate and total lipid, and the pigments chlorophyll, phycobilins, β-carotene, were analysed at regular intervals during cultivation. In addition, the total bacterial cell numbers were enumerated during the study and their influence on algal growth was...
Tipo: Manuscript Palavras-chave: Biotechnology; Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/4331/version/1
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Mechanisms of cadmium toxicity and tolerance in Populus Nature Precedings
Brahma Reddy Induri; Stephen DiFazio; Danielle Ellis; Gancho Slavov; Tong-Ming Yin; Gerald Tuskan.
Abstract ID#: 26642
Background and Methods:

Cadmium (Cd), ranked the 7th most hazardous substance, is one of the most widespread pollutants of soil and water in industrialized nations. Its increased movement in soil-plant systems is posing a serious threat to human health. Cd, without any known functions in plants, was found to be toxic even at minute concentrations, leading to the development of symptoms such as leaf roll, chlorosis and root and shoot growth reduction. Phytoremediation is an emerging cost-effective and environment friendly technology that utilizes high biomass producing plants including Populus plants to remove, transform or stabilize contaminants in soils. The objectives of our study...
Tipo: Presentation Palavras-chave: Genetics & Genomics; Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/5410/version/1
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Mechanisms to overcome ecosystem nitrogen and phosphorus limitation Nature Precedings
Rebecca Ostertag.
Nutrients limit plant growth in many ecosystems, and many species develop adaptations to either obtain more nutrients or to avoid losses. Much past ecological work has focused either on temperate nitrogen-limited systems or has addressed infertile soils as a single entity, rather than addressing the nature of the limitation. Although low nitrogen (N) and phosphorus (P) soils are found worldwide, the consequences of N and P limitation for plants may vary due to fundamental differences in the soil mobility, availability, uptake, and cellular uses of N and P. Using a well-studied chronosequence in the Hawaiian Islands, which contains both low N and P soils but which is dominated by similar plant communities, foliar N and P plant responses to fertilization...
Tipo: Manuscript Palavras-chave: Ecology; Plant Biology.
Ano: 2008 URL: http://precedings.nature.com/documents/1993/version/1
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Mechanistic mechanisms of competition and biodiversity Nature Precedings
Lev V. Kalmykov; Vyacheslav L. Kalmykov.
The nature of competition and biodiversity are open basic questions since Darwin. To investigate mechanisms of interspecific competition and their contribution in biodiversity as closely as possible we offer a white-box modelling method based on physically interpreted ecological axioms. These models are implemented as deterministic individual-based cellular automata and able to give a direct physico-mechanistic insight into studied phenomena. Competition of two trophically identical but fitness different species, competing for one limiting resource in one stable uniform habitat (which is closed for immigration, emigration, predation, herbivory and parasitism) has been investigated in conditions, which are the most unfavourable for their coexistence. The...
Tipo: Manuscript Palavras-chave: Ecology; Microbiology; Bioinformatics; Plant Biology; Evolutionary Biology.
Ano: 2012 URL: http://precedings.nature.com/documents/7105/version/1
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Mega- change gene copies are produced by reverse transcription of precursor RNA with replaced introns. Nature Precedings
Drew Schwartz.
This report describes the presence of copy genes in plants where the sequence similarity to their parental genes is almost completely limited to limited to the exons. Evidence is presented that indicates that they arose via a novel processing of transcribed precursor RNA during which the introns are replaced rather than excised, followed by reverse transcription and incorporation into the chromosomes. Intron replacement may play an important role in evolution as it results in megagene changes.
Tipo: Manuscript Palavras-chave: Genetics & Genomics; Bioinformatics; Plant Biology; Evolutionary Biology.
Ano: 2009 URL: http://precedings.nature.com/documents/3834/version/1
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Microbial ecosystem constructed in water for successful organic hydroponics Nature Precedings
Makoto Shinohara; Hiromi Ohmori; Yoichi Uehara.
Conventional hydroponics systems generally use only chemical fertilisers, not organic ones, since there are no microbial ecosystems present in such systems to mineralise organic compounds to inorganic nutrients. Addition of organic compounds to the hydroponic solution generally has phytotoxic effects and causes poor plant growth. We developed a novel hydroponic culture method using organic fertiliser. A microbial ecosystem was constructed in hydroponic solution by regulating the amounts of organic fertiliser and soil, with moderate aeration. The microbial ecosystem mineralised organic nitrogen to nitrate-nitrogen via ammonification and nitrification. A 97.6% efficiency of nitrate-nitrogen generation from the organic nitrogen in the organic fertiliser was...
Tipo: Manuscript Palavras-chave: Ecology; Microbiology; Earth & Environment; Plant Biology.
Ano: 2008 URL: http://precedings.nature.com/documents/2494/version/1
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Migration potential as a new predictor of long-distance dispersal rate for plants Nature Precedings
Tianhua He; Byron B. Lamont; Neal Enright; Siegy Krauss; Laura Merwin.
How biotic and abiotic factors interact to shape the overall pattern of dispersal of propagules is critical in understanding the evolution of dispersal mechanisms as well as predicting dispersal rates between patchily-distributed habitats. But which plant traits, demographic and/or habitat factors best predict the capacity for dispersal? We introduce the concept of migration potential (v), a readily interpretable parameter that combines recruitment efficiency (recruits per adult / seeds per adult per dispersal cycle) with level of habitat occupancy for predicting effective long-distance dispersal (LDD) of seeds. Using our empirical (genotype assignment) estimates of LDD and statistics on life-history traits and demographic features for contrasting...
Tipo: Manuscript Palavras-chave: Ecology; Earth & Environment; Plant Biology; Evolutionary Biology.
Ano: 2011 URL: http://precedings.nature.com/documents/5890/version/1
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Mitochondrial Molecular Adaptations and Life History Strategies Coevolve in Plants Nature Precedings
Neeraja M. Krishnan; Basuthkar J. Rao.
Messenger RNA secondary structure prevents mutations at functionally important sites. Mutations at exposed sites would cause micro-adaptations, niche-specialization, and therefore, can be thought to promote K-strategists. Exposing, rather than protecting, conserved sites, is also potentially adaptive because they probably promote macro-adaptive changes. This presumably fits r-strategists: their population dynamics tolerate decreased survival. We found that helix-forming tendencies are greater at evolutionary conserved sites of plant mitochondrial mRNAs than at evolutionary variable sites in a majority (73%) of species–gene combinations. K-strategists preferentially protect conserved sites in short genes, r-strategists protect them most in larger...
Tipo: Manuscript Palavras-chave: Bioinformatics; Plant Biology; Evolutionary Biology.
Ano: 2008 URL: http://precedings.nature.com/documents/1922/version/1
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Mizoribin as a inhibitor for leukocyte immunoglobulin receptor sub family A member3 Nature Precedings
Varala Sravani; I Vani Priyadarshini; Amineni Umamaheswari.
The Leukocyte Immunoglobulin-like Receptors (LILRs) are a family of receptors that was broadly expressed on all leukocytes and have the ability to regulate their function. The increased levels of human LILRA3 in rheumatoid arthritis patients leads to stroke. In quest of designing novel inhibitors against LILRA3 an accurate homology model for the protein was based on crystal structures of 1GOX and 3P2T using Modeller 9V9. The use of multiple templates for structure prediction led us to propose a structure comprising all 439 amino acids of human LILRA3 for the first time. The best model was selected based on GA341 and DOPE score and further assessed through ProSA and PROCHECK. The validated structure was subjected to CASTp analysis ligand binding site...
Tipo: Presentation Palavras-chave: Bioinformatics; Plant Biology.
Ano: 2011 URL: http://precedings.nature.com/documents/6532/version/1
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Mobile Image Ratiometry for the Detection of Botrytis cinerea (Gray Mold) Nature Precedings
Donald C. Cooper.
Mobile Platform Informatics (MPI) and Smartphone Informatics (SPI) methods like Mobile Image Ratiometry (MIR) are potentially transformative point-of-use instantaneous analysis tools that are useful across a variety of industries. In agriculture, MIR-compatible immuno test strips allow early detection of a number of biotic stressors before devastating crop losses occur. Here we describe a low-cost and easy-to-use Smartphone and/or tablet-based protocol (Mobile Assay Inc., www.mobileassay.com) for the detection and on-sight instantaneous analysis of B. cinerea, a fungus that causes significant damage to a variety of plants and flowers. Early detection and tracking of the B. cinerea fungus before the visible gray mold appears has the potential to increase...
Tipo: Manuscript Palavras-chave: Biotechnology; Ecology; Earth & Environment; Plant Biology.
Ano: 2012 URL: http://precedings.nature.com/documents/6989/version/1
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Modelling predicts that heat stress and not drought will limit wheat yield in Europe Nature Precedings
Mikhail A. Semenov; Peter R. Shewry.
Global warming is characterised by shifts in weather patterns and increases in extreme weather events. New crop cultivars with specific physiological traits will therefore be required if climate change is not to result in losses of yield and food shortages. However, the intrinsic uncertainty of climate change predictions poses a challenge to plant breeders and crop scientists who have limited time and resources and must select the most appropriate traits for improvement. Modelling is, therefore, a powerful tool to identify future threats to crop production and hence targets for improvement. Wheat is the most important crop in temperate zones, including Europe, and is the staple food crop for many millions of humans and their livestock. However, its...
Tipo: Manuscript Palavras-chave: Earth & Environment; Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/4335/version/1
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Modulation of iron responsive gene expression and enzymatic activities in response to changes of the iron nutritional status in _Cucumis sativus_ L. Nature Precedings
Patrizia De Nisi; Gianpiero Vigani; Graziano Zocchi.
Regulation exerted by the iron status of the plant on the iron deficiency responses was investigated in cucumber roots (_Cucumis sativus_ L.) both at the biochemical and molecular level. Absence of iron induced the expression of the CsFRO1, CsIRT1, CsHA1 and the Cspepc1 transcripts that was followed by an increase in the corresponding enzymatic activities. Supply of iron repressed gene expression, in particular those of the Fe(III)-chelate reductase and for the high affinity iron transporter and reduce the enzymatic activities. Our results confirm and extend the hypothesis of a coordinate regulation of these responses. Besides these two activities strictly correlated with iron deficiency adaptation, we considered also the H+-ATPase and the...
Tipo: Manuscript Palavras-chave: Plant Biology.
Ano: 2010 URL: http://precedings.nature.com/documents/4658/version/1
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