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| Registros recuperados: 241 | |
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| Kaushal Kumar Bhati; Vijay Kumar Singh. |
| Glycine Betaine is a quaternary amino compound that accumulates in stress conditions, mainly abiotic stresses like drought and salinity & synthesized by the two-step oxidation of choline via the intermediate betaine aldehyde, catalyzed by Choline monooxygenase and Betaine aldehyde dehydrogenase (BADH).
The sequence analysis of key enzymes of Glycine betaine biosynthesis i.e. BADH was carried out using various online proteomic tools available on Expasy and EBL, and then homologous modeling of this enzyme was performed using automated mode SWISS-MODEL & GENO 3D and models were analyzed on QMEAN. This was an attempt to find the possible model of BADH, because no physical model of BADH is yet available on... |
| Tipo: Manuscript |
Palavras-chave: Bioinformatics; Plant Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6360/version/1 |
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| Daniel R. Taub. |
| I performed a meta-analysis of studies examining the relationships among nutrient availability, plant growth rate and allocation to roots vs. shoots. Species characteristic of high fertility habits grew faster than species characteristic of less fertile habitats. While species were highly plastic in root/shoot ratio, there was a strong correlation in root/shoot across fertility levels when plants were grown across fertility gradients. This suggests that the proportional mass allocation to roots is a consistent characteristic of individual species relative to other species. There was no consistent relationship between allocation to roots and either growth rate or the fertility of habitats that species typically are found in. |
| Tipo: Manuscript |
Palavras-chave: Ecology; Plant Biology. |
| Ano: 2007 |
URL: http://precedings.nature.com/documents/185/version/1 |
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| Sierra Rayne; Giuseppe Mazza. |
| Sumac is the common name for a genus (Rhus) that contains over 250 individual species of flowering plants in the family Anacardiaceae. These plants are found in temperate and tropical regions worldwide, often grow in areas of marginal agricultural capacity, and have a long history of use by indigenous peoples for medicinal and other uses. The research efforts on sumac extracts to date indicate a promising potential for this plant family to provide renewable bioproducts with the following reported desirable bioactivities: antifibrogenic, antifungal, antiinflammatory, antimalarial, antimicrobial, antimutagenic, antioxidant, antithrombin, antitumorigenic, antiviral, cytotoxic, hypoglycaemic, and leukopenic. As well, the bioactive components can be extracted... |
| Tipo: Manuscript |
Palavras-chave: Chemistry; Pharmacology; Plant Biology. |
| Ano: 2007 |
URL: http://precedings.nature.com/documents/631/version/1 |
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| 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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| Manoj K. Rajput; Kailash C. Upadhyaya. |
| Retrotransposons constitute a major fraction of plant genomes and these elements may have played a significant role in evolution and sequence organization of genomes. In order to access the diversity of Ty1-copia group of retroelements, reverse transcriptase (RT) sequences were amplified from chickpea genome, using the primers derived from two conserved domains of RT region. Thirty-six RT regions from independent amplicons were cloned and sequenced. On the basis of homology of deduced amino acids, the RT sequences could be grouped into three major families. The intra-family divergence at amino acid level ranges from 2 to 19%. Though intra-family RT sequences were conserved but no two sequences were identical. The results indicate a high degree of... |
| Tipo: Manuscript |
Palavras-chave: Biotechnology; Genetics & Genomics; Bioinformatics; Plant Biology. |
| Ano: 2007 |
URL: http://precedings.nature.com/documents/697/version/1 |
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| Vincent Obade; Eva Clercq. |
| Monitoring the distribution of wild animals using appropriate methods and survey techniques is essential not only for sustainable management but also to avoid wastage of resources. This study applied remote sensing to investigate the factors influencing the distribution of herbivores in Nairobi National Park, Kenya. Impala was selected as indicator specie for the herbivores within the park, because the population of impala had drastically reduced over time. The influence of food availability, water and disturbance on herbivore presence was investigated. A positive significant statistical relationship between impala population density and feed availability was observed. However, the correlation between impala population density and water distance was... |
| Tipo: Manuscript |
Palavras-chave: Ecology; Plant Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3799/version/1 |
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| Steven J. Wagstaff; Ilse Breitwieser; Christopher Quinn; Motomi Ito. |
| Biogeographic relationships in the southern hemisphere have puzzled biologists for the last two centuries. Once joined to form the supercontinent Gondwana, Africa, Antarctica, Australia, New Zealand and South America are widely separated by the Pacific and Indian oceans. Sir Joseph Hooker was the first to suggest that Antarctica served as a corridor for plant migration not unlike the land-bridges in the northern hemisphere. While the Antarctic flora was largely erased by glaciation during the Pleistocene, at least some of these Antarctic plant communities found refuge on the subantarctic islands. Here we provide support for the hypothesis that giant herbs persisted in the subantactic islands prior to the onset of Pleistocene glaciation, then dispersed... |
| Tipo: Manuscript |
Palavras-chave: Ecology; Plant Biology; Evolutionary Biology. |
| Ano: 2007 |
URL: http://precedings.nature.com/documents/1272/version/1 |
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| Jeff Ollerton; Louise Cranmer; Ralph Stelzer; Steve Sullivan; Lars Chittka. |
| The Canary Islands are home to a guild of endemic, threatened bird pollinated plants. Previous work has suggested that these plants evolved floral traits as adaptations to pollination by flower specialist sunbirds, but subsequently they appear to be have co-opted passerine birds as sub-optimal pollinators. To test this idea we carried out a quantitative study of the pollination biology of three of the bird pollinated plants, Canarina canariensis (Campanulaceae), Isoplexis canariensis (Veronicaceae) and Lotus berthelotii (Fabaceae), on the island of Tenerife. Using colour vision models, we predicted the detectability of flowers to bird and bee pollinators. We measured pollinator visitation rates, nectar standing crops, as well as seed set and pollen... |
| Tipo: Manuscript |
Palavras-chave: Ecology; Plant Biology. |
| Ano: 2008 |
URL: http://precedings.nature.com/documents/1977/version/1 |
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| 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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| Doina M. Costescu; I. C. Baianu. |
| NMR, NIR and EM techniques are suitable methods of measuring protein and oil content in soybeans. After completion of a measurement with NMR or NIR, a soybean sample could be either replanted or consummated. NMR techniques involved in the present work are based on the response of nuclei, as nuclear spin flips, when set in a 7.05T magnetic field and excited with rf pulses of 300 MHz. NIR spectroscopy is based on outer electron molecular vibrations, when excited with radiation of frequency 1012 -4×1014Hz, and =2.5Om-750 nm. 
TEM and ESEM techniques are bulk and surface analysis techniques, respectively, working with electron beams of 15KV, and image resolution in the range of nm’s. ESEM is based on the... |
| Tipo: Presentation |
Palavras-chave: Biotechnology; Chemistry; Developmental Biology; Genetics & Genomics; Molecular Cell Biology; Plant Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6192/version/1 |
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| Sierra Rayne; Kaya Forest. |
| Saskatchewan, Canada, with a total land area of 651,900 km^2^, is one of the world’s most productive agricultural cropping regions. Approximately 44% of Canada's total cultivated farmland is in the province. In 2008, the total export value of crops was CAD$8.34 billion. Over the past century, changing industry economics and advances in scientific, technical, and engineering knowledge and practices have affected the amount and type of crops produced. The current work examines time trends for agricultural crop production since Saskatchewan was created in 1905. While yields of all crops have generally increased over time, total production trends vary widely by crop, warranting more detailed investigations into the socio-economical and... |
| Tipo: Poster |
Palavras-chave: Earth & Environment; Plant Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6712/version/1 |
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| Keisuke Saito; Hiroshi Ishikita. |
| Photosystem I (PSI) and II (PSII) possess chlorophyll pairs P~A~/P~B~ and P~D1~/P~D2~, respectively. These chlorophylls are the primary electron donors in the light-induced electron transfer. After the electron transfer, the radical cation remains on these chlorophyll pairs, forming [P~A~/P~B~]^·+^ and [P~D1~/P~D2~]^·+^. The positive charge distributions over the two chlorophylls were reported to be 10/90-50/50 for P~A~^·+^/P~B~^·+^ [1,2] and 70/30-80/20 for P~D1~^·+^/P~D2~^·+^ [3,4]. To clarify the origin of the distributions, we calculated ratios of P~A~^·+^/P~B~^·+^ and P~D1~^·+^/P~D2~^·+^ with a quantum mechanical/molecular mechanical (QM/MM) approach and the... |
| Tipo: Poster |
Palavras-chave: Chemistry; Bioinformatics; Plant Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6486/version/1 |
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| Evgenii Levites. |
| There is an attempt to explain some evolutionary processes in plants such as saltatory changes on the base of multidimensionality of plant inherited information coding. According to the suggested hypothesis, inherited information is coded by not only a nucleotide sequence but also by chromosome differential endoreduplication. It is supposed that chromosomes compete among each other for the contact with the nuclear membrane, but a change in the endoreduplication degree of various chromosome sites can result in a change of a competition ability for the contact with a nuclear membrane. A simultaneous increase of chromosome endoreduplication degree of many sites can lead to an increase of nuclear membrane surface and to a change in chromosome competitive... |
| Tipo: Manuscript |
Palavras-chave: Genetics & Genomics; Plant Biology; Evolutionary Biology. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/4405/version/1 |
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| Kunwar Awaneesh Singh; Chandan Singh; G.R.K. Rao; M.V. Jagannatham. |
| Crinumin, a glycosylated serine protease with chymotrypsin like catalytic specificity was purified from a medicinally important plant _Crinum asiaticum_ of family _Amaryllidaceae_. Ethno-botanical information and Pharmacological studies confirming about the presence of active bio- molecules in the _Crinum_ played crucial role in injury, inflamed joint, local pain and arthritis. Biomedical research suggests chymotrypsin was not only used as digestive aid but also helpful in the above disease. These findings support towards the crinumin may be the active bio-molecule. Crinumin shows activity over a wide range of pH (4.5-11.5 and optimum at 8.5), temperature (75 °C and optimum at 70 °C) and is also functional against chaotrophs, organic... |
| Tipo: Poster |
Palavras-chave: Pharmacology; Plant Biology. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/4339/version/1 |
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| David LeBauer; Dan Wang; Xiaohui Feng; Michael Dietze. |
| *Background/Question/Methods* Ecosystem models use physiological traits and environmental data to model land-air carbon exchange. Such models can integrate heterogeneous ecological and environmental data, but rarely account for the contribution of each input to the overall uncertainty in model output. Quantifying uncertainty in each model input and propagating uncertainty through model ensembles directly estimates overall uncertainty in model output. Identification of data that would most effectively constrain uncertainty can also be directly inferred by processing output. Real-time data assimilation and forecasting benefits from a method that is transparent, scalable, and adaptable. A tool that manages these steps while tracking the provenance of data... |
| Tipo: Presentation |
Palavras-chave: Ecology; Bioinformatics; Earth & Environment; Plant Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/5533/version/1 |
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| Suresh Gopalan. |
| One form of plant immunity against pathogens involves a rapid host programmed cell death at the site of infection accompanied by resistance, termed the hypersensitive response (HR). Here it is shown that the HR programmed cell death program initiated by the bacterial type III secretion system dependent proteinaceous elicitor harpin from Erwinia amylovora can be reversed till very late in the process by the plant growth regulator auxin. Early inhibition or late reversal of this cell death program does not affect marker genes tightly correlated with local and systemic resistance. Cross-regulation between cell death programs and growth regulators is prevalent in different kingdoms. Thus, the concept that cell death program can be reversed till late provides a... |
| Tipo: Manuscript |
Palavras-chave: Biotechnology; Microbiology; Molecular Cell Biology; Plant Biology. |
| Ano: 2007 |
URL: http://precedings.nature.com/documents/1347/version/1 |
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| Registros recuperados: 241 | |
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