Charles Morrison Chairman, John Leahy, Alan Castle, Jakobovits, Frances Gibb, Legal Affairs Correspondent, Clifford Longley, Vivien Goldsmith Family Money Editor, Stuart Jones and Clive White, Rollo Maughfling, Juan Carlos Gumucio Ainab, Simon Barnes, Jane MacQuitty, Peter Philp, Gordon Allan, David Rhys Jones, Sheridan Morley, Philip Howard, Hilary Finch, Eric Sharpe, Michael Binyon, Jeremy Kingston, Harry James, George Sivell, H. C. Fitzer, Jean Corkish and Maria Scott, Jeremy Flint, Douglas Lowndes, Mario Modiano, Colin Narbrough, Jeremy Kingston and Irving Wardle, Gerald Davies, Vivien Goldsmith, Peter Brown, Peter Dyer, Francesca Greenoak, Henry Gee, Michael Tate, Hilary Doling, Jim McCue, Richard Evans, Philip Webster and Colin Narbrough, Colin Haycraft, Ian Murray, Bonn, and Charles Bremner, Richard Ford Political Correspondent, Mick Cleary, Peter Bills, Martin Cropper, Eamonn Butler, Michael McCarthy, Environment Correspondent, Philip Robinson, Michael Hamlyn, Sabine Durrant, Frances Bissell, David Hands, Barry Fantoni, Charles Bremner, John Percival, Rex Bellamy, Tennis Correspondent, Martin Fletcher Political Reporter, Humphrey Hawksley, Philip G. Turner (Director), Simon Tait, Alex McWhirter, Nicole Swengley, George Rae, David Cross, Sydney Friskin, Nicholas Harling, Cyril Restieaux, Shona Crawford Poole Travel Editor, David Smith, Economics Correspondent, David Miller, Nigel Andrew, Mitchell Platts Golf Correspondent, Philip Webster, Chief Political Correspondent, (Michael Phillips), Sandy Bisp, John Higgins, Richard Bassett and Dessa Trevisan, Christopher Goulding, Robin Oakley, Political Editor, Raymond Keene, W.J. Burroughs, Lesley Chamberlain, Peter Dear and Jane Rackham, Peter Stothard, Paul Griffiths, Tony Partington, Steve Acteson, Peter Bryan, W. J. Burroughs, A. Zenined, Stephen Thorpe, Robin Neillands, Martin Trew, Stewart Tendler, Crime Reporter, Irving Wardle, Peter Brimelow, David Sapsted, Richard Bassett, Brian Beel, Keith MacKlin, Simon Tait, Arts Correspondent, Deyan Sudjic, David Hands Rugby Correspondent, Kenneth Fleet, Pat Butcher, Athletics Correspondent, John Goodbody, Michael Tanner, Brian Alderson, Sam Kiley, Higher Education Reporter, Ahmed Fazl and Michael Hamlyn, Graham Searjeant Financial Editor, Clive White, Sarah Jane Checkland Art Market Correspondent, Michael Seely, David Gollob, Alan Lee, Jenny Gilbert, Peter Morris, Michael Clark and Geoffrey Foster, John Hoskyns, Director General, David Sinclair, Andrew Buckoke, Stephen Pettitt, Martin Waller, Tom Tickell, Michael Horsnell, Frances Gibb Legal Affairs Correspondent, R. A. Hendey, Chairman, Peter Hankey, Jonathan Meades, Hugh Thompson, David Nicholson-Lord, Michael Evans Defence Correspondent, Richard Morrison, Richard Ford, Political Correspondent, R. A. H. Morrow, Colin Campbell, Judy Froshaug, Vivien Goldsmith, Family Money Editor, Peter Evans, Home Affairs Correspondent, David Walker, Public Administration Correspondent, Anthony Kershaw, Stuart Jones, Football Correspondent,
... leader in Sri Lankan politics Rev Canon Harry Wittenbach Missionary work in East Asia Church news Weekend ...
1989 - Gale Group | TDA
Robert E. Pitts, James L. Wittenbach,
... on: Oxford Academic PubMed Google Scholar James L. Wittenbach James L. Wittenbach Search for other works by this author on: ...
Tópico(s): Taxation and Compliance Studies
1981 - Oxford University Press | Journal of Consumer Research
... loss of chlorophyll, soluble protein, and photosynthetic capacity (Wittenbach 1977 Plant Physiol. 59: 1039-1042). Senescence in ...
Tópico(s): Seed Germination and Physiology
1978 - Oxford University Press | PLANT PHYSIOLOGY
... were determined by rocket immunoelectrophoresis as described previously (Wittenbach 1978 Plant Physiol 62: 604-608). RuBPCase constituted ...
Tópico(s): Plant responses to elevated CO2
1979 - Oxford University Press | PLANT PHYSIOLOGY
M. J. Bukovac, F. Zucconi, Vernon A. Wittenbach, J. A. Flore, Hitoshi Inoue,
Abstract (2-Chloroethyl)phosphonic acid (ethephon) applied as a foliar spray to sweet cherry trees within 2 weeks of fruit maturity promoted fruit abscission at the lower (fruit:pedicel) zone, as indexed by a reduction in the fruit removal force (FRF). There was no significant effect, at the concn studied, on abscission at the upper (pedicel:peduncle) zone. Promotion of abscission with ethephon was time and concn dependent. Ethephon concn of 100 to 1000 ppm were effective with a greater response from ...
Tópico(s): Horticultural and Viticultural Research
1971 - American Society for Horticultural Science | Journal of the American Society for Horticultural Science
Vernon A. Wittenbach, M. J. Bukovac,
Abstract Abscission of maturing sweet cherry fruit ( Prunus avium L. cv. Windsor) occurred at 2 different abscission zones, depending on the stage of fruit development. Immature fruit abscised at the upper zone between the pedicel and peduncle; mature fruit abscised at the lower zone between the fruit and receptacle. Separation in the abscission layer began directly above the stony pericarp and resulted in the formation of a cavity. Later separation occurred at the fruit : pedicel indentation and extended ...
Tópico(s): Postharvest Quality and Shelf Life Management
1972 - American Society for Horticultural Science | Journal of the American Society for Horticultural Science
Intact wheat seedlings (Triticum aestivum L.) were induced to senesce by placing them in the dark and at various stages of senescence were placed back in the light and their recoverability observed. Seedlings demonstrated complete recovery of chlorophyll, protein, and rate of photosynthesis after 2 days in the dark, but were unable to recover fully after 4 days. This suggests the onset of an irreversible stage in senescence by day 4. Foliar applied cytokinins delayed senescence, and zeatin at 0.1 ...
Tópico(s): Silicon Effects in Agriculture
1977 - Oxford University Press | PLANT PHYSIOLOGY
Vernon A. Wittenbach, Martin J. Bukovac,
Initiation of abscission at the pedicel-fruit zone in the sour cherry (Prunus cerasus L. cv. Montmorency) occurs near the transition of Stage II to Stage III of fruit growth. The preinitiation phase is characterized by a high fruit removal force (FRF) and explants prepared from fruits during this period do not undergo abscission as indexed by a reduction in FRF. Ethylene does not cause a significant reduction in FRF either in attached fruit or in explants prepared during this period. By contrast, ...
Tópico(s): Postharvest Quality and Shelf Life Management
1974 - Oxford University Press | PLANT PHYSIOLOGY
Vernon A. Wittenbach, R. C. Ackerson, Robert T. Giaquinta, Richard R. Hebert,
Changes in photosynthesis, rlbulose bisphosphate carboxylase (RuBPCase), and proteolytic activity were followed in the leaves of field‐grown soybeans [ Glycine max (L.) Merr. cv. Kent] from flowering through senescence. These parameters were followed in relation to changes in leaf resistance, chlorophyll, protein, starch, total N levels, and seed development. In addition, changes in leaf ultrastructure were observed. The initial symptoms of senescence (evident 3 to 4 weeks after flowering) were a decline ...
Tópico(s): Cassava research and cyanide
1980 - Wiley | Crop Science
Vernon A. Wittenbach, M. J. Bukovac,
Abstract Physiological parameters of abscission at the zone between the pedicel and fruit of the sour ( Prunus cerasus L. ‘Montmorency’) and sweet ( Prunus avium L. ‘Windsor’) cherry were investigated using fruit explants. 3-Indoleacetic acid, 2-(chloroethyl)phosphonic acid (ethephon), gibberellin A 3 , and abscisic acid hastened abscission (during Stage III) in sour cherry, while only ethephon enhanced abscission in the sweet cherry. Cycloheximide blocked abscission in both sour and sweet cherry and negated ...
Tópico(s): Postharvest Quality and Shelf Life Management
1973 - American Society for Horticultural Science | Journal of the American Society for Horticultural Science
Vernon A. Wittenbach, Willy Lin, Richard R. Hebert,
Mesophyll protoplasts isolated from primary leaves of wheat seedlings were used to follow the localization of proteases and the breakdown of chloroplasts during dark-induced senescence. Protoplasts were readily obtained from leaf tissue, even after 80% of the chlorophyll and protein had been lost. Intact chloroplasts and vacuoles could be isolated from the protoplasts at all stages of senescence. All the proteolytic activity associated with the degradation of ribulose bisphosphate carboxylase in ...
Tópico(s): Plant Stress Responses and Tolerance
1982 - Oxford University Press | PLANT PHYSIOLOGY
Depodding soybean (Glycine max [L] Merr. cv Wye) plants results in an apparent inhibition of senescence as indicated by leaf chlorophyll and soluble protein retention. However, leaf photosynthesis and ribulose bisphosphate carboxylase (Rubisco) levels begin to decline earlier in depodded than in control, podded plants. The initial decline in photosynthesis is correlated with a decrease in leaf transpiration, while the latter decline is associated with the loss of Rubisco. Total soluble protein remains ...
Tópico(s): Seed Germination and Physiology
1982 - Oxford University Press | PLANT PHYSIOLOGY
Willy Lin, Vernon A. Wittenbach,
Mesophyll protoplasts were isolated from the leaves of wheat and corn seedlings. After purification the protoplasts were judged to be free of contaminating proteases in the isolation enzymes based on specific activity of the proteases in comparison to leaf tissue and their response to inhibitors that "differentiated" between leaf and isolation enzyme proteases. Wheat protoplasts showed rates of photosynthesis of 95 to 100 micromoles O(2) per milligram chlorophyll per hour, while corn exhibited rates ...
Tópico(s): Enzyme Production and Characterization
1981 - Oxford University Press | PLANT PHYSIOLOGY
Vincent R. Franceschi, Vernon A. Wittenbach, Robert T. Giaquinta,
Immunohistochemical staining was used to determine the cellular distribution of two glycosylated polypeptides (molecular weights of 27 and 29 kilodaltons) which are normally present at low levels in soybean (Glycine max var ;Wye') leaves but which markedly accumulate after depodding. These polypeptides, which comprise a substantial portion of the total leaf soluble protein of depodded plants, were exclusively located in the vacuoles of paraveinal mesophyll and associated bundle sheath cells. These ...
Tópico(s): Plant nutrient uptake and metabolism
1983 - Oxford University Press | PLANT PHYSIOLOGY
Well nodulated, field-grown soybeans (Glycine max [L.] Merr. var Williams) were depodded just prior to seed development and near mid pod-fill. Both treatments caused a considerable increase in leaf dry weight, suggesting continued photosynthate production following pod removal. Moreover, depodding had a marked effect on leaf soluble protein without affecting total proteolytic activity. Early depodding caused a 50% increase in leaf protein, and both early and late depodding caused the retention of ...
Tópico(s): Agronomic Practices and Intercropping Systems
1983 - Oxford University Press | PLANT PHYSIOLOGY
Removing the pods from soybean (Glycine max [L.] Merr. cv Wye) plants induces a change in leaf function which is characterized by a change in the leaf soluble protein pattern. The synthesis of at least four polypeptides ( approximately 27, 29, 54, and 80 kilodaltons) is enhanced, and these polypeptides accumulate to levels comprising over 50% of the soluble protein. Heat girdling the petiole also causes the accumulation of these polypeptides, suggesting that the signal for changing leaf function may ...
Tópico(s): Plant nutrient uptake and metabolism
1983 - Oxford University Press | PLANT PHYSIOLOGY
Vincent R. Franceschi, Maurice S. B. Ku, Vernon A. Wittenbach,
Tópico(s): Plant nutrient uptake and metabolism
1984 - Elsevier BV | Plant Science Letters
Steven J. Crafts‐Brandner, Frederick E. Below, Vernon A. Wittenbach, James E. Harper, Richard H. Hageman,
In conjunction with a study of the effects of ear removal on the senescence of whole maize (Zea mays L.) plants, visual symptoms and associated changes in constituent contents and activities of a selected leaf (first leaf above the ear) were determined. Leaves were sampled from field-grown eared and earless Pioneer brand 3382, B73 x Mo17, and Farm Services brand 854 maize hybrids at nine times during the grainfilling period.VISUAL SYMPTOMS INDICATED THE FOLLOWING SEQUENCE AND RATE OF SENESCENCE: earless ...
Tópico(s): Silicon Effects in Agriculture
1984 - Oxford University Press | PLANT PHYSIOLOGY
U. D. Havelka, R. C. Ackerson, M. G. Boyle, Vernon A. Wittenbach,
Soybeans [ Glycine max (L.) Merr. ‘Kent’ and ‘Ware’], grown under field conditions, were exposed to a CO 2 ‐enriched atmosphere (1232 μL L −1 ) from 22 days after planting to maturity. Seed yield increased 81% in Kent and 56% in Ware in response to CO 2 enrichment. Plants grown at high CO 2 concentrations maintained higher rates of apparent photosynthesis and lower leaf conductances throughout ontogeny than those grown at low CO 2 concentrations. Carbon dioxide‐enriched plants accumulated larger pools of ...
Tópico(s): Legume Nitrogen Fixing Symbiosis
1984 - Wiley | Crop Science
Hugh M. Brown, Vernon A. Wittenbach, D. Raymond Forney, Stephen Strachan,
Tópico(s): Pesticide and Herbicide Environmental Studies
1990 - Elsevier BV | Pesticide Biochemistry and Physiology
Vernon A. Wittenbach, P. W. Teaney, Wayne S. Hanna, Dennis R. Rayner, John V. Schloss,
Isopropylmalate dehydrogenase (IPMDH) is the third enzyme specific to leucine biosynthesis. It catalyzes the oxidative decarboxylation of 3-isopropylmalate (3-IPM) to 2-ketoisocaproic acid. The partially purified enzyme from pea (Pisum sativum L.) shows a broad pH optimum of 7.8 to 9.1 and has Km values for 3-IPM and NAD of 18 and 40 [mu]M, respectively. O-Isobutenyl oxalylhydroxamate (O-IbOHA) has been discovered to be an excellent inhibitor of the pea IPMDH, with an apparent inhibitor constant of 5 ...
Tópico(s): Plant responses to water stress
1994 - Oxford University Press | PLANT PHYSIOLOGY
Vernon A. Wittenbach, Mary K. Koeppe, Francis T. Lichtner, William T. Zimmerman, R. W. Reiser,
Triflusulfuron methyl (methyl 2-[[[[[4-(dimethylamino)-6-(2,2,2-triftuoroethoxy)-1,3,5-triazin-2-yl]amino]carbonyl]amino]sulfonyl]-3-methylbenzoate), formerly DPX-66037, is a new selective postemergence sulfonylurea herbicide for the control of annual and perennial broadleaf weeds and grasses in sugar beets (Beta vulgaris). Similar to other sulfonylureas, the site of action of triflusulfuron methyl is acetolactate synthase (ALS), an enzyme in branched-chain amino acid biosynthesis. This herbicide is ...
Tópico(s): Plant Disease Resistance and Genetics
1994 - Elsevier BV | Pesticide Biochemistry and Physiology
Clio Andris, David Cowen, Jason D. Wittenbach,
Abstract Large, multivariate geographic datasets have been used to characterize geographic space with the help of spatial data mining tools. In our study, we explore the sufficiency of the S upport V ector M achine ( SVM ), a popular machine‐learning technique for unsupervised classification and clustering, to help recognize hidden patterns in a college admissions dataset. Our college admissions dataset holds over 10,000 students applying to an undisclosed university during one undisclosed year. Students ...
Tópico(s): Advanced Statistical Methods and Models
2012 - Wiley | Transactions in GIS
Michael H. Howard, Teodorica Cenizal, Steven Gutteridge, Wayne S. Hanna, Yong Tao, Maxim Totrov, Vernon A. Wittenbach, Ya‐Jun Zheng,
Peptide deformylase (PDF) has been identified as a promising antibacterial and herbicide target. A structurally novel class of inhibitors containing a 2-thioxo-thiazolidin-4-one heterocycle substituted by an arylidene group at the 5-position and a hexanoic acid side chain at the 3-position was discovered independently via high-throughput screening and virtual ligand screening. Data mining and analogue synthesis established a structure−activity relationship for the side chain region that is consistent ...
Tópico(s): Chemical Synthesis and Analysis
2004 - American Chemical Society | Journal of Medicinal Chemistry
Ayelet Nudelman, Dana Marcovici-Mizrahi, Abraham Nudelman, Dennis H. Flint, Vernon A. Wittenbach,
Tópico(s): Molecular Junctions and Nanostructures
2004 - Elsevier BV | Tetrahedron
... Brandner, S.J., F.E. Below, V.A Wittenbach, J.E. Harper, and R.H. Hageman. 1984b. ...
Tópico(s): Agriculture, Soil, Plant Science
2013 - | Agronomy monograph/Agronomy
... Acids Research 13, 7327– 7339. Franceschi, V. R., Wittenbach, V. A. & Giaquinta, R. T. (1983). Paraveinal mesphyll ...
Tópico(s): Seed Germination and Physiology
1995 - Wiley | Biological reviews/Biological reviews of the Cambridge Philosophical Society
Jason D. Wittenbach, Kristofer E. Bouchard, Michael S. Brainard, Dezhe Z. Jin,
Consecutive repetition of actions is common in behavioral sequences. Although integration of sensory feedback with internal motor programs is important for sequence generation, if and how feedback contributes to repetitive actions is poorly understood. Here we study how auditory feedback contributes to generating repetitive syllable sequences in songbirds. We propose that auditory signals provide positive feedback to ongoing motor commands, but this influence decays as feedback weakens from response ...
Tópico(s): Marine animal studies overview
2015 - Public Library of Science | PLoS Computational Biology
Yisi Zhang, Jason D. Wittenbach, Dezhe Z. Jin, Alexay A. Kozhevnikov,
Variable motor sequences of animals are often structured and can be described by probabilistic transition rules between action elements. Examples include the songs of many songbird species such as the Bengalese finch, which consist of stereotypical syllables sequenced according to probabilistic rules (song syntax). The neural mechanisms behind such rules are poorly understood. Here, we investigate where the song syntax is encoded in the brain of the Bengalese finch by rapidly and reversibly manipulating ...
Tópico(s): Marine animal studies overview
2017 - Society for Neuroscience | Journal of Neuroscience
Nikita Vladimirov, Chen Wang, Burkhard Höckendorf, Avinash Pujala, Masashi Tanimoto, Yu Mu, Chao-Tsung Yang, Jason D. Wittenbach, Jeremy Freeman, Stephan Preibisch, Minoru Koyama, Philipp Keller, Misha B. Ahrens,
Tópico(s): Neural dynamics and brain function
2018 - Nature Portfolio | Nature Methods