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Articles 5431 - 5460 of 59392
Full-Text Articles in Entire DC Network
Transformation Of White Clover With A Gene Encoding A White Clover Mosaic Virus Coat Protein, Brigitta Dudas, R L.S Forster, C J. Van Dolleweerd, D.W R. White
Transformation Of White Clover With A Gene Encoding A White Clover Mosaic Virus Coat Protein, Brigitta Dudas, R L.S Forster, C J. Van Dolleweerd, D.W R. White
IGC Proceedings (1977-2023)
Genes encoding the white clover mosaic virus (WClMV) coat protein . have been introduced into white clover (Trifolimn repens L.) using Agrobacterium tumefaciens mediated T-DNA transfer. Integration of the coat protein gene in regenerated callus has been confirmed hy Southern blotting of polymerase chain reaction (PCR) amplification products generated using specific oligonucleotide primers. A polyclonal antibody, raised against purified WCIMV coal protein, recognised a polypeptide of c. 25 kDa after SOS-PAGE and Western blotting. The recogilised polypeptide co-migrates with the purified coat protein. Using ELISA, levels of coat protein accumulation in transgenic callus have been determined. The scope for …
Embryo Rescue And Somatic Hybridisation For The Production Of Interspecific Hybrids In The Genus Medicago, S Arcioni, F Damiani, M Piccirilli, F Pupilli
Embryo Rescue And Somatic Hybridisation For The Production Of Interspecific Hybrids In The Genus Medicago, S Arcioni, F Damiani, M Piccirilli, F Pupilli
IGC Proceedings (1977-2023)
T• broaden the germplasm sources available for the genetic improvement of alfalfa, new interspecific hybrids between Medlcago saliva L. and other Medicago species (M. coemlea, M. arborea and M. rugosa) hove been obtained. To • overcome lncompalibility barriers existing between alfalfa and the wild species, ovule-embryo culture and somatic hybridisation were used. Viable plants were obt11incd through the utilisation of both techniques Md their hybrid nature was demonstrated by analysis of morphological traits, by cylological investigations and by electrophorelic profiles of esterascs and peroxidases. Hybrids were fertile and In the fulure their backcross to alfalfa should allow the useful tr11i,s …
Use Of Molecular Markers In Alfalfa For Construction Of A Genetic Map And Studying Genetic Rearrangements In Non-Sexually Derived Hybrids, F Damiani, F Pupilli, M Piccirilli, S Arcioni
Use Of Molecular Markers In Alfalfa For Construction Of A Genetic Map And Studying Genetic Rearrangements In Non-Sexually Derived Hybrids, F Damiani, F Pupilli, M Piccirilli, S Arcioni
IGC Proceedings (1977-2023)
Two genomic libraries have been constructed from Medicago saliva DNA reslfictcd with both Pstl and EcoRT. The libraries have been screened and compared for the presence of highly repeated DNA sequences. Restriction fragment length polymorphism among 3 varieties of M. saliva (Rangelander, Adriana, CADL) and 3 species of the genus Medicago (M. coerulea, M. falcata, M. arborea) has been investigated using a large number of probe-enzyme combinations .. Four-and 6-base cutter restriction enzymes have been used. DNA electrophoresis has been performed with· 2 substrates (agarose and polyacrylamide) in order to detect polymorphism at a higher range of fragment lengths. About …
Use Of Allozyme Genetic Markers To Follow The Establishment Of White Clover Oversown Into Hill Country, K D. Adam, M E. Wedderburn, L A. Greaves
Use Of Allozyme Genetic Markers To Follow The Establishment Of White Clover Oversown Into Hill Country, K D. Adam, M E. Wedderburn, L A. Greaves
IGC Proceedings (1977-2023)
Allozyme marker loci Gpi-3,4 and Pgm-3,4 were used to monitor establishment of plants of the white clover (Trifolium repens L., cv. Grasslands Huia) oversown into 3 steep, north-facing hill country pastures. Comparisons of genotype frequencies in samples of the unimproved (resident) populations, the oversown populations 18 months after oversowing and Huia, provided information about changes in the genetic composition of the white clover populations after oversowing. In each case, oversowing brought about significant changes in allele frequencies but the estimated proportions of plants of cuhivar Huia were variable at 24.2%, 92.4% and 100%, indicating that establishment rates can vary not …
Tissue Culture Of Sainfoin, Nakashima Hiroshi, Yang Zhuomeng
Tissue Culture Of Sainfoin, Nakashima Hiroshi, Yang Zhuomeng
IGC Proceedings (1977-2023)
The effecls of 1-napthaleneacetic acid (NAA) and 6-benzylamino purine (BAP) on callus induction, callus proliferation and plant regeneration were examined ip sainfojn (011ob1ycl1is viciifo/ia Scop.) from differen! ex plant. Then the effects of indole-3-butyric acid (IBA) on root formation from differentiated shoot from calli were examined. The combinations of 1-10 µM ofNAA an4 BAP were better for sainfoin culture. For callus induction, there was no significant difference among 3 explants, but Chere were interactions between explant and media. For plant regeneration, hypocotyl and root are ��ter explants than cotyledon. The effects of NAA and BAP showed less effective on callus …
Use Of Allozyme Genetic Markers To Follow The Establishment Of White Clover Oversown Into Hill Country Pastures, K D. Adam, M E. Wedderburn, L A. Greaves
Use Of Allozyme Genetic Markers To Follow The Establishment Of White Clover Oversown Into Hill Country Pastures, K D. Adam, M E. Wedderburn, L A. Greaves
IGC Proceedings (1977-2023)
Allozyme marker loci Gpi-3,4 and Pgm-3,4 were used to monitor establishment of plants of the white clover (Trifolum repens L., cv. Grasslands Huia) oversown into 3 steep, north-facing hill country pastures. Comparisons of genotype frequencies in samples of the unimproved (resident) populations, the oversown populations 18 months after oversowing and Huia, provided information about changes in the genetic composition of the white clover populations after oversowing. In each case, oversowing brought about significant changes in allele frequencies but the estimated proportions of plants of cuhivar Huia were variable at 24.2%, 92.4% and 100%, indicating that establishment rates can vary …
Application Of The Somaclone Method In Fertility Restoration Of The Partially Sterile Hybrid Of Agropyron Repens X Bromus Inermis: Callus Initiation And Plant Regeneration, L E. Heszky, J Janovsky, G Gyulai, E Kiss, L T. Hangyel
Application Of The Somaclone Method In Fertility Restoration Of The Partially Sterile Hybrid Of Agropyron Repens X Bromus Inermis: Callus Initiation And Plant Regeneration, L E. Heszky, J Janovsky, G Gyulai, E Kiss, L T. Hangyel
IGC Proceedings (1977-2023)
. Callus initiation and plant regeneration from the new intergeneric hybrid of Agropyron repens L., Beauv, x Bromus inermis.1 Leyss. cv. Nanus (Agromus) was carried out. For callus initiation, the inflorescence primordia were incubated on an optimised nutritive medium designated medium-F, supplemented with 2,4-dichlorophenoxyacetic acid (0.5 mg/ I). Within 21 days of plating, embryogenic callus with globular structures were developed, From the 21st day of culture, one-step plant regeneration occurred from callus without subculture. Non-regenerative calli were subcultured to medium-F supplemented with different cytokinins. The cytological analysis of the calli showed wide genetic:il variability in chromosome number with …
Dairying Farming In New Zealand, Bryan Guy
Dairying Farming In New Zealand, Bryan Guy
IGC Proceedings (1977-2023)
Dairy farming in New Zealand is primarily an export industry based almost entirely on the use of perennial ryegrass and while clover. A low cost dairy farming system has been developed and it is this system which enables the New Zealand dairy farmer to survive on returns from the international marketplace. Milk marketing in New Zealand is controlled by a single producer organisation, the New Zealand Dairy Board, which also provides breeding services lo some 14 700 dairy farmers. The industry aims to maximise the net income of dairy farmers. Emphasis is on efficient production and is often measured on …
Sheep And Beef Farming On The West Coast Of The North Island Of New Zealand, R A. Neeley, T G. Parminter
Sheep And Beef Farming On The West Coast Of The North Island Of New Zealand, R A. Neeley, T G. Parminter
IGC Proceedings (1977-2023)
Over 40% of New Zealand's occupied land area is devoted to hill country farming. The forms are typically owned, managed and ·worked by a single family with some help from seasonal labour. The properly owned by L.D. and R.A. Neeley is a typical example of the type of hill country farms found on the west coast of the North Island. It has an effective area of 520 ha and carries 5000 stock units, 30% of which are cattle. The sheep policy is to finish 60-100% of lambs produced from an improved Romney breed flock (with a 90-100% lambing rate). Friesian …
Policy Developments And Trade Prospects For Grassland-Based Products, Graeme H. Tie, Jayantha P. Kottege, Brian S. Fisher
Policy Developments And Trade Prospects For Grassland-Based Products, Graeme H. Tie, Jayantha P. Kottege, Brian S. Fisher
IGC Proceedings (1977-2023)
The economic outlook for grassland-based products over the next decade will be influenced by a range of factors. Important among these will be the outcome of the agricultural negotiations in the Uruguay Round of the General Agreement on Tariffs and Trade. Failure to achieve satisfactory agricultural reform in the Uruguay Round could result in an acceleration in the trend toward the formation of regional trading arrangements. This could, in turn, lead to increased fragmentation of the international trading system. Such fragmentation reduces the global economic gains available from trade which stem from specialisation and the associated exercise of comparative advantage. …
European Grassland Farming: Future Prospects, David R. Harvey, Caroline Saunders
European Grassland Farming: Future Prospects, David R. Harvey, Caroline Saunders
IGC Proceedings (1977-2023)
The paper reviews recent policy reforms and current pressures in Europe, including the CAP reforms, GATT considerations, the potential for European and CIS integration, and the environmental pressures on policy. The possible consequences of these reforms are then considered, illustrated by estimates of European grassland product market conditions in the event of multilateral free trade in form products. Finally, the implications of these trends for farming practices are considered, with special reference to the UK and European Community. In spite of rather glacial progress towards trade liberalisation, Che conclusions are: i) that future· strategic planning at both national and farm …
A Traditional Exporter's Perspective Of Trade Reforms, N R. Mitchell
A Traditional Exporter's Perspective Of Trade Reforms, N R. Mitchell
IGC Proceedings (1977-2023)
The agriculture and trade policies which governments commonly have pursued over the last three decades, particularly governments in the large developed countries, have had a major impact on world patterns of production and trade in livestock and livestock products. This has been especially so for milk and dairy products where government involvement in markets has been most pervasive. One effect has been that the comparative advantages derived from the production of livestock products based on pasture feeding of animals \lave been suppressed or overridden. Reform of the international trading system for agricultural products now being developed in the GATT, and …
Impact Of Changing Trade Opportunities On Livestock Production In Developing Countries, J K. Camoens
Impact Of Changing Trade Opportunities On Livestock Production In Developing Countries, J K. Camoens
IGC Proceedings (1977-2023)
For the lesser developed countries (LDCs) and advanced countries (ACs), the paper identifies the determinants of "free" trade, analyses protectionism, examines the global trade picture with respect lo "free" trade, relates trade to production and the structure of demand, and finally predicts the impact of trade reforms. The analysis concludes that: (i) trade policies per se do not impact in any significant manner on domestic production or imports in the LDCs since world trade constitutes a small fraction of production; (ii) demand, and hence supply, of animal products are determined primarily by GNP, income distribution and price; (iii) grassland farming …
Development Of Grain-Saving, High Efficiency Pasture Animal Industry, Han Gui Qing
Development Of Grain-Saving, High Efficiency Pasture Animal Industry, Han Gui Qing
IGC Proceedings (1977-2023)
Grain-saving, high efficiency pasture-sustained (GSHEPS) animal industry, with its final purpose of profitable industry, is forage-orientated. This is a new fonn of operation based on advanced feeding management.
A Call For Better Understanding Household Complexity In Environmental Social Science, Rebecca Nixon, Brooke Mcwherter, Anna Erwin, Jonathan Bauchet, Zhao Ma
A Call For Better Understanding Household Complexity In Environmental Social Science, Rebecca Nixon, Brooke Mcwherter, Anna Erwin, Jonathan Bauchet, Zhao Ma
School of Earth, Environmental, & Marine Sciences Faculty Publications
No abstract provided.
An Automated Machine Learning Approach To The Retrieval Of Daily Soil Moisture In South Korea Using Satellite Images, Meteorological Data, And Digital Elevation Model, Nari Kim, Soo-Jin Lee, Eunha Sohn, Mija Kim, Seonkyeong Seong, Seung Hee Kim, Yangwon Lee
An Automated Machine Learning Approach To The Retrieval Of Daily Soil Moisture In South Korea Using Satellite Images, Meteorological Data, And Digital Elevation Model, Nari Kim, Soo-Jin Lee, Eunha Sohn, Mija Kim, Seonkyeong Seong, Seung Hee Kim, Yangwon Lee
Institute for ECHO Articles and Research
Soil moisture is a critical parameter that significantly impacts the global energy balance, including the hydrologic cycle, land–atmosphere interactions, soil evaporation, and plant growth. Currently, soil moisture is typically measured by installing sensors in the ground or through satellite remote sensing, with data retrieval facilitated by reanalysis models such as the European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis 5 (ERA5) and the Global Land Data Assimilation System (GLDAS). However, the suitability of these methods for capturing local-scale variabilities is insufficiently validated, particularly in regions like South Korea, where land surfaces are highly complex and heterogeneous. In contrast, artificial intelligence …
The Aimag Project: Using Machine Learning To Predict Crustal Magnetic Anomaly Values, Xavier Gobble, Marlie Mollett, Dr. Dawn King, Dr. Cory Reed, Erin Knese
The Aimag Project: Using Machine Learning To Predict Crustal Magnetic Anomaly Values, Xavier Gobble, Marlie Mollett, Dr. Dawn King, Dr. Cory Reed, Erin Knese
Undergraduate Research Symposium
A detailed model of the Earth’s total magnetic field is important for acquiring the means for GPS-alternative, magnetic anomaly-based navigation. The Earth’s total magnetic field is an amalgam of 5 mechanisms: the geodynamo generated by the rotation of the Earth’s molten iron core, the fields induced by the flows of electric current in the atmosphere and oceans, the disturbance of the ionosphere by solar wind, and local anomalies attributable to ferromagnetic minerals present in the crust; the lattermost compose the crustal magnetic field. The EMAG2v3 dataset comprises a compilation of satellite, shipborne, and airborne magnetic measurements differenced from the Comprehensive …
The Environment Of Glaciovolcanic Caves And Their Value As Planetary Analogues, Christian Stenner, Lee J. Florea, Linda Sobolewski, Andreas Pflitsch, Morgan Cable, Roberto Anitori, Richard E. Davis, Kathleen Graham, Glyn Williams-Jones
The Environment Of Glaciovolcanic Caves And Their Value As Planetary Analogues, Christian Stenner, Lee J. Florea, Linda Sobolewski, Andreas Pflitsch, Morgan Cable, Roberto Anitori, Richard E. Davis, Kathleen Graham, Glyn Williams-Jones
FRONTIERS UNBOUND: Exploring Extreme Environments
No abstract provided.
The Ecology Of Chemosynthesis In Submerged Coastal Caves, Robert Scharping, Michael Casso, Isabel Schaal, Paul Henderson, James Garey, Matthew Charette, John Pohlman, Stefan Sievert
The Ecology Of Chemosynthesis In Submerged Coastal Caves, Robert Scharping, Michael Casso, Isabel Schaal, Paul Henderson, James Garey, Matthew Charette, John Pohlman, Stefan Sievert
FRONTIERS UNBOUND: Exploring Extreme Environments
No abstract provided.
A Systematic Study Of Planetary Envelope Growth With 3d Radiation-Hydrodynamics Simulations, Avery Bailey, James M. Stone, Jeffrey Fung
A Systematic Study Of Planetary Envelope Growth With 3d Radiation-Hydrodynamics Simulations, Avery Bailey, James M. Stone, Jeffrey Fung
Physics & Astronomy Faculty Research
In the core accretion model of planet formation, envelope cooling regulates the accretion of material and ultimately sets the time-scale to form a giant planet. Given the diversity of planet-forming environments, opacity uncertainties, and the advective transport of energy by three-dimensional (3D) recycling flows, it is unclear whether one-dimensional models can adequately describe envelope structure and accretion in all regimes. Even in 3D models, it is unclear whether approximate radiative transfer methods sufficiently model envelope cooling, particularly at the planetary photosphere. To address these uncertainties, we present a suite of 3D radiation-hydrodynamics simulations employing methods that directly solve the transfer …
Carbon Isotope Budget Indicates Biological Disequilibrium Dominated Ocean Carbon Storage At The Last Glacial Maximum, Anne Willem Omta
Carbon Isotope Budget Indicates Biological Disequilibrium Dominated Ocean Carbon Storage At The Last Glacial Maximum, Anne Willem Omta
Faculty Scholarship
Understanding the causes of the ~90 ppmv atmospheric CO2 swings between glacial and interglacial climates is an important open challenge in paleoclimate research. Although the regularity of the glacial-interglacial cycles hints at a single driving mechanism, Earth System models require many independent physical and biological processes to explain the full observed CO2 signal. Here we show that biologically sequestered carbon in the ocean can explain an atmospheric CO2 change of 75 ± 40 ppmv, based on a mass balance calculation using published carbon isotopic measurements. An analysis of the carbon isotopic signatures of different water masses indicates similar regenerated carbon …
Luminescence, Esr And Cl Characterisation Of Quartz Extracted From Granite Source Rocks And The Derived Sediments Used For Provenance Studies, Daniela Constantin, Aditi Dave, Serban Grecu, Zuzanna Kabacińska, Mihai Ducea, Petru Urdea, Alida Timar-Gabor
Luminescence, Esr And Cl Characterisation Of Quartz Extracted From Granite Source Rocks And The Derived Sediments Used For Provenance Studies, Daniela Constantin, Aditi Dave, Serban Grecu, Zuzanna Kabacińska, Mihai Ducea, Petru Urdea, Alida Timar-Gabor
FRONTIERS UNBOUND: Exploring Extreme Environments
No abstract provided.
Revisiting The Chronology Of Loess In North America By Using Sar-Osl And Pirir Protocols, Anca Avram
Revisiting The Chronology Of Loess In North America By Using Sar-Osl And Pirir Protocols, Anca Avram
FRONTIERS UNBOUND: Exploring Extreme Environments
No abstract provided.
Preliminary Analysis Of Quartz Using Scanning Electron Microscopy Techniques, Serban Constantin Grecu, Alida Timar-Gabor
Preliminary Analysis Of Quartz Using Scanning Electron Microscopy Techniques, Serban Constantin Grecu, Alida Timar-Gabor
FRONTIERS UNBOUND: Exploring Extreme Environments
No abstract provided.
Hraunrásir: Exploring And Studying The Steaming Lava Tubes Of Fagradalsfjall Volcano (Iceland), Francesco Sauro, Riccardo Pozzobon, Martina Cappelletti, Bogdan P. Onac, Ana Zelia Miller, Groq Birkefeldt Moller Pedersen, Tommaso Santagata
Hraunrásir: Exploring And Studying The Steaming Lava Tubes Of Fagradalsfjall Volcano (Iceland), Francesco Sauro, Riccardo Pozzobon, Martina Cappelletti, Bogdan P. Onac, Ana Zelia Miller, Groq Birkefeldt Moller Pedersen, Tommaso Santagata
FRONTIERS UNBOUND: Exploring Extreme Environments
No abstract provided.
Seasonal Changes In Forage Regrowth Yield And Quality Of Three Old World Bluestems, Larry M. White
Seasonal Changes In Forage Regrowth Yield And Quality Of Three Old World Bluestems, Larry M. White
IGC Proceedings (1977-2023)
Little information is available on differences in regrowth yield and quality among Old World bluestems (Bothriochloa spp.). Harvesting was staged such that 4-week regrowth of Caucasian (B. caucasica), cv. WW-Iron Master (D, ischaemum var. i.,ischaemum) and cv, Super Cauc (D. caucasica) was harvested each week from early May through mid-September to determine forage yield, ill vitro dry matter digestibility (IVDMD) and crude protein content of leaves and stems. Forage yield peaked in late June with WW-Iron Master, Caucasian, and Super Cauc producing 1280, 11S0 and 930 kg/ho/4 weeks of leaves and S00 200 and …
Herbage Production And Quality Of Rs2, A Quackgrass (Elytrigia Repens [L.]Neski.) X Bluebunch Wheatgrass (Pseudoroegneria Spicata [Pursh.] Love) Hybrid, M R. Haferkamp, D C. Adams, E E. Grings, P O. Currie
Herbage Production And Quality Of Rs2, A Quackgrass (Elytrigia Repens [L.]Neski.) X Bluebunch Wheatgrass (Pseudoroegneria Spicata [Pursh.] Love) Hybrid, M R. Haferkamp, D C. Adams, E E. Grings, P O. Currie
IGC Proceedings (1977-2023)
Fertiliser and mowing effects on herbage quality and yield of the RS2 hybrid were studied. Plants were fertilised with 0, 112 or 224 kg Nlha in spring 1988 and 1989, or with 112+112kg N/ha split in spring-summer, Plants were unmowed or mowed to a SO mm stubble height on selected dates in 1988 and 1989. Maximum standing crops (SC) of unmowed plants averaged 3000 kg/ha in 1988 and 5600 kg/ha in 1989; SC were increased 1000 kg/ha by fertilisation in 1989. Crude protein (CP) exceeded 120 g/kg in unmowed herbage in 1988 and decreased from 200 g/kg in May to …
Utilization Of Tall Fescue In Pure Stand, In Association With White Clover And In Complex Mixtures, S Badoux
Utilization Of Tall Fescue In Pure Stand, In Association With White Clover And In Complex Mixtures, S Badoux
IGC Proceedings (1977-2023)
Tall fescue (Festuca arundinacea Schreb.) was cultivated in pure stand, in association with white clover (Trifolium repens L.) and in various complex grass-legume mixtures. Forage yield and quality were always higher in associations with white clover than in tall fescue pure stands. However, under dry conditions, the balance between the two components was difficult to maintain. In more complex mixtures cocksfoot and tall fescue tended to become dominant and to produce a forage of lower quality. In mixtures of long duration, we replaced meadow fescue by tall fescue. Total yield over 3 years was improved; the digestibility of …
Use Of Plant Height For Determining The Nutritive Value, Yield And The Optimal Use Span Of Lucerne, Lother Schmidt
Use Of Plant Height For Determining The Nutritive Value, Yield And The Optimal Use Span Of Lucerne, Lother Schmidt
IGC Proceedings (1977-2023)
Determining the ·cutting date is important for high yield, good forage quality and longevity of lucerne (Medicago media Pers.) stands. Most recommendations for the optimal use date are based on the development ,stage. The results of research conducted over 9 years show that forage quality and the dry matter (DM) yield of luccrne, at the same, developmental stage, vary considerably, depending on weather conditions during the growth period. A better criterion is the plant height of lucerne. There was a highly significant correlation between plant height and the content of crude fibre, crude protein and DM. We recommend the …
Lamb And Steer Production From Continuously Grazed Alfalfa, Jerry D. Volesky, Daniel P. Mowrey
Lamb And Steer Production From Continuously Grazed Alfalfa, Jerry D. Volesky, Daniel P. Mowrey
IGC Proceedings (1977-2023)
Little is known about livestock production from alfalfa (Medicago saliva L,) under continuous grazing. Objectives were to determine lamb and steer performance, production and leaf-stem selection on continuously grazed alfalfa. Lambs and steers separately grazed 3 replicate pastures from late April through mid-August, 1991. Initial stocking densities were relatively heavy to utilise rapid spring growth after which livestock numbers were reduced to maintain alfalfa with a 20-cm stubble height. Season-long live-weight gains for the lambs and steers were 0.15 and 0.94 kg/day. Total production for lambs and steers was 557 and 529 kg/ha, Lamb diets generally contained a higher …