Ramaswamy Premakumar

Works (13)

Updated: July 5th, 2023 16:01

2007 journal article

Fructans from oat and rye: Composition and effects on membrane stability during drying

BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES, 1768(6), 1611–1619.

By: D. Hincha *, D. Livingston n, R. Premakumar n, E. Zuther *, N. Obel*, C. Cacela*, A. Heyer *

author keywords: desiccation; fructan; liposome; oat (Avena sativa); rye (Secale cereale)
MeSH headings : Avena / chemistry; Cell Membrane / physiology; Chromatography, Gel; Chromatography, High Pressure Liquid; Dehydration; Fructans / chemistry; Fructans / isolation & purification; Liposomes / metabolism; Secale / chemistry; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
TL;DR: The data indicate that cereal fructan have the ability to stabilize membranes under stress conditions and that there are size and species dependent differences between the fructans. (via Semantic Scholar)
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Source: Web Of Science
Added: August 6, 2018

2006 journal article

Additional freeze hardiness in wheat acquired by exposure to-3 degrees C is associated with extensive physiological, morphological, and molecular changes

JOURNAL OF EXPERIMENTAL BOTANY, 57(14), 3601–3618.

By: E. Herman *, K. Rotter*, R. Premakumar n, G. Elwinger n, R. Bae, L. Ehler-King, S. Chen *, D. Livingston n

author keywords: aquaporin; cold acclimation; DNA array; electron microscopy; freeze hardiness; proteome; proteomics; transcriptome; wheat
MeSH headings : Acclimatization; Aquaporins / genetics; Aquaporins / metabolism; Electrophoresis, Gel, Two-Dimensional; Freezing; Gene Expression Profiling; Gene Expression Regulation, Plant; Golgi Apparatus / ultrastructure; Mass Spectrometry; Oligonucleotide Array Sequence Analysis; Plant Proteins / genetics; Plant Proteins / metabolism; RNA, Messenger / metabolism; Reverse Transcriptase Polymerase Chain Reaction; Triticum / genetics; Triticum / metabolism; Triticum / ultrastructure
TL;DR: Results indicate that the enhanced freezing tolerance of SZA is correlated with a wide diversity of changes, indicating that the additional freezing tolerance is the result of complex biological processes. (via Semantic Scholar)
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Added: August 6, 2018

2005 journal article

Carbohydrate concentrations in crown fractions from winter oat during hardening at sub-zero temperatures

ANNALS OF BOTANY, 96(2), 331–335.

By: D. Livingston n, R. Premakumar n & S. Tallury*

author keywords: freezing tolerance; crown tissue; oat; Avena sativa; carbohydrates; fructan; apical meristem
MeSH headings : Adaptation, Physiological; Analysis of Variance; Avena / growth & development; Avena / metabolism; Avena / physiology; Carbohydrate Metabolism; Freezing; Meristem / metabolism
TL;DR: Results support the hypothesis that carbohydrate change in mildly frozen plants is tissue specific within crowns and underscore the need to evaluate specific tissue within the crown when correlating the biochemistry of plants with freezing tolerance. (via Semantic Scholar)
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2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2005 journal article

Carbohydrate partitioning between upper and lower regions of the crown in oat and rye during cold acclimation and freezing

CRYOBIOLOGY, 52(2), 200–208.

By: D. Livingston n, R. Premakumar n & S. Tallury n

author keywords: cold acclimation.; oat (Avena sativa); rye (Secale cereale); freezing; apical ineristem; crown; carbohydrates; fructan; histology
MeSH headings : Acclimatization; Avena / chemistry; Carbohydrates / analysis; Carbohydrates / chemistry; Cold Temperature; Freezing; Fructans / analysis; Secale / chemistry
TL;DR: Results suggest that to understand how carbohydrates relate to freezing tolerance, regions of the crown that endure freezing stress differently should be compared. (via Semantic Scholar)
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2. Zero Hunger (Web of Science)
6. Clean Water and Sanitation (OpenAlex)
13. Climate Action (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2005 journal article

Changes in the histology of cold-hardened oat crowns during recovery from freezing

CROP SCIENCE, 45(4), 1545–1558.

By: D. Livingston n, S. Tallury n, R. Premkumar n, S. Owens* & C. Olien*

TL;DR: The initial freezing rate of the apical region was higher than that of the crown core, and the meristematic regions of the king's crown may provide in initial freezing rates. (via Semantic Scholar)
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2. Zero Hunger (Web of Science)
6. Clean Water and Sanitation (OpenAlex)
13. Climate Action (Web of Science)
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Added: August 6, 2018

2005 journal article

Registration of 'Doyce' hulless barley

CROP SCIENCE, 45(2), 792–793.

By: W. Brooks *, M. Vaughn, C. Griffey *, A. Price*, T. Pridgen*, W. Rohrer*, D. Brann*, E. Rucker * ...

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2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
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Added: August 6, 2018

2005 journal article

Registration of 'Price' barley

CROP SCIENCE, 45(2), 791–792.

By: W. Brooks *, M. Vaughn, C. Griffey *, A. Price*, T. Pridgen*, W. Rohrer*, D. Brann*, E. Rucker * ...

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UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2005 journal article

Registration of 'Thoroughbred' barley

CROP SCIENCE, 45(2), 789–790.

By: W. Brooks *, M. Vaughn, C. Griffey *, A. Price*, T. Pridgen*, W. Rohrer*, D. Brann*, E. Rucker * ...

UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2002 journal article

Apoplastic carbohydrates do not account for differences in freezing tolerance of two winter-oat cultivars that have been second phase cold-hardened

Cereal Research Communications, 30(3-4), 375–381.

By: D. Livingston & R. Premakumar

Source: NC State University Libraries
Added: August 6, 2018

2000 journal article

Thermal effect of CO2 on apoplastic ice in rye and oat during freezing

PLANT PHYSIOLOGY, 122(3), 861–865.

By: D. Livingston n, C. Olien* & R. Premakumar n

MeSH headings : Avena / drug effects; Avena / metabolism; Calorimetry, Indirect; Carbon Dioxide / pharmacology; Carbon Dioxide / toxicity; Ethylene Glycol; Freezing; Ice; Pressure; Secale / drug effects; Secale / metabolism; Water
TL;DR: It is proposed that CO(2) from respiration had dissolved in the water in the plants and caused melting of ice (heat absorption) due to the colligative properties of solutions and the water froze (heat evolution). (via Semantic Scholar)
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UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
6. Clean Water and Sanitation (OpenAlex)
13. Climate Action (Web of Science)
Source: Web Of Science
Added: August 6, 2018

1996 journal article

Phenotypic characterization of a tungsten-tolerant mutant of Azotobacter vinelandii

JOURNAL OF BACTERIOLOGY, 178(3), 691–696.

By: R. Premakumar n, S. Jacobitz n, S. Ricke n & P. Bishop n

MeSH headings : Azotobacter vinelandii / drug effects; Azotobacter vinelandii / enzymology; Azotobacter vinelandii / growth & development; Drug Resistance; Genes, Bacterial; Molybdenum / metabolism; Mutation; Nitrogenase / genetics; Phenotype; Transcription, Genetic; Tungsten / pharmacology
TL;DR: Results from growth experiments suggest that both nitrogenases 1 and 3 are utilized when CA6 grows in N-free medium containing Na2MoO4, and are consistent with the possibility that the tungsten tolerance mutation carried by CA6 is in a Mo transport system. (via Semantic Scholar)
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Added: August 6, 2018

1994 article

EFFECT OF AMINO-ACID SUBSTITUTIONS IN A POTENTIAL METAL-BINDING SITE OF ANFA ON EXPRESSION FROM THE ANFH PROMOTER IN AZOTOBACTER-VINELANDII

PREMAKUMAR, R., LOVELESS, T. M., & BISHOP, P. E. (1994, October). JOURNAL OF BACTERIOLOGY, Vol. 176, pp. 6139–6142.

By: R. Premakumar*, T. Loveless* & P. Bishop*

MeSH headings : Azotobacter / enzymology; Azotobacter / genetics; Azotobacter / growth & development; Bacterial Proteins; Base Sequence; DNA Mutational Analysis; DNA-Binding Proteins / genetics; Gene Expression Regulation, Bacterial; Molecular Sequence Data; Molybdenum / metabolism; Nitrogenase / biosynthesis; Nitrogenase / genetics; Promoter Regions, Genetic / genetics; Recombinant Fusion Proteins / biosynthesis; Trans-Activators / genetics; Transcription, Genetic; Vanadium / metabolism
TL;DR: AnfA, an activator required for transcription of the structural genes encoding nitrogenase 3 (anfHDGK) in Azotobacter vinelandii, has a potential metal-binding site [(S19)H(C21)FTGE(C26)R] in its N terminus]. (via Semantic Scholar)
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Added: August 6, 2018

1984 journal article

EVIDENCE FOR 2 DINITROGENASE REDUCTASES UNDER REGULATORY CONTROL BY MOLYBDENUM IN AZOTOBACTER-VINELANDII

BIOCHIMICA ET BIOPHYSICA ACTA, 797(1), 64–70.

By: R. Premakumar n, E. Lemos & P. Bishop*

TL;DR: Results with the Nif− strains provide evidence for the existence of two reductase activities, one of which is expressed in the presence of Mo (dinitrogenase reduct enzyme) and the other in the absence ofMo (alternative reduCTase). (via Semantic Scholar)
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Source: Web Of Science
Added: August 6, 2018

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