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- Peer-Reviewed Publications (3)
- Ethiopia. (2)
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- Works Authored with SJSU Graduate Students (2)
- 1 - Plant Development & Biomechanics (1)
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- Allelopathy -- Research Methods (1)
- Arabidopsis (1)
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- Do we really need new policies? A study on soil sealing in Egypt (1)
- Erosion Risk Mapping (1)
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- GIS Spatial Modeling for Land Degradation Assessment in Tigray, Ethiopia. (1)
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- Mapping Soil Erosion Risk Using Rusle, Gis and Remote Sensing Techniques (1)
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- Modeling of Soil Sealing by Urban Sprawl in Wukro, Ethiopia Using Remote Sensing and GIS Techniques (1)
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Articles 1 - 17 of 17
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Fungal Superhighways: Do Common Mycorrhizal Networks Enhance Belowground Communication?, E K. Barto, Jeffrey D. Weidenhamer, D Cipollini
Fungal Superhighways: Do Common Mycorrhizal Networks Enhance Belowground Communication?, E K. Barto, Jeffrey D. Weidenhamer, D Cipollini
Jeffrey D. Weidenhamer
In many natural communities communication between plants and other organisms below ground drives community dynamics. This communication is primarily through the release and detection of infochemicals, which must traverse the soil matrix to be effective. In this opinion article, we propose the Network Enhanced Bioactive Zone (NEBaZ) model, which posits that common mycorrhizal networks (CMNs) increase the bioactive zones of infochemicals by serving as superhighways directly connecting plants below ground. Here we argue that infochemical transport via CMNs allows for systemic defense signaling across plant populations and directed allelochemical delivery to target plants. Plant-animal interactions may also be facilitated by …
Do We Really Need New Policies? A Study On Soil Sealing In Egypt, Ahmed Harb Rabia
Do We Really Need New Policies? A Study On Soil Sealing In Egypt, Ahmed Harb Rabia
Ahmed Harb Rabia A.H. Rabia
Egypt has the lowest area of agricultural land per individual in Africa. The agricultural land stands for a total of approximately 3.5 million ha which characterized about 3.5% of the total area of Egypt in 2007. The urban encroachment over arable productive agricultural land in Egypt is common and is called (urban desertification). Therefore, the annual loss of arable land to urbanization is 1.2%. This indicates a serious situation to the agricultural area. the Academy of Scientific Research & Technology (1994) has reported that during the period from 1978 to 1984, the annual expansion rates of the dwelling area ranged …
What's In Your Nitrogen Budget?, Robert Mikkelsen
What's In Your Nitrogen Budget?, Robert Mikkelsen
Robert Mikkelsen
No abstract provided.
Mapping Soil Erosion Risk Using Rusle, Gis And Remote Sensing Techniques, Ahmed Harb Rabia A.H. Rabia
Mapping Soil Erosion Risk Using Rusle, Gis And Remote Sensing Techniques, Ahmed Harb Rabia A.H. Rabia
Ahmed Harb Rabia A.H. Rabia
Soil erosion is one of the major causes of land degradation in arid and semi-arid areas like Ethiopia, including Tigray Highlands, which is highly affected by the risk of desertification. Tackling on-site effects of soil erosion requires understanding of the rates of soil loss as well as identification of the major controlling factors that accelerate or slow down these processes. The study aims to quantify the soil loss by erosion process and to specify the main factor affecting the Erosion development in the study area. The Study area was Kilte Awulaelo District which is situated in the eastern part of …
Modeling Of Soil Sealing By Urban Sprawl In Wukro, Ethiopia Using Remote Sensing And Gis Techniques, Ahmed Harb Rabia A.H. Rabia
Modeling Of Soil Sealing By Urban Sprawl In Wukro, Ethiopia Using Remote Sensing And Gis Techniques, Ahmed Harb Rabia A.H. Rabia
Ahmed Harb Rabia A.H. Rabia
Soil sealing is the covering of the soil surface with materials like concrete and stone, as a result of new buildings, roads, parking places but also other public and private space. Soil sealing by urban sprawl continues to increase all over the world where the area of urbanized land is increasing even more rapidly than the population. The degree of sealing is associated to the land use type and the density of population. Techniques of Remote Sensing and Geographical Information System (GIS) have been used widely to measure urban sprawl and to analyze the spatial features and unique mechanism of …
Gis Spatial Modeling For Land Degradation Assessment In Tigray, Ethiopia., Ahmed Harb Rabia A.H. Rabia
Gis Spatial Modeling For Land Degradation Assessment In Tigray, Ethiopia., Ahmed Harb Rabia A.H. Rabia
Ahmed Harb Rabia A.H. Rabia
Land degradation can be described as reduction in the present and prospective land quality and production, due to natural or anthropogenic dynamics. This phenomenon is one of the most important problems facing farmers and decision makers in several countries. This study aims to use GIS spatial modeling to quantify land (physically and chemically) degradation in the study area based on remotely sensed and field survey’s data. A GIS spatial model has been developed based on the LADA- FAO methodology to apply a land degradation assessment in the study area. Final land degradation map has been produced by combining the outputs …
Simulation Of Barley Grain Yield Using Artificial Neural Networks And Multiple Linear Regression Models, Omar Maghawri Ibrahim Hassan
Simulation Of Barley Grain Yield Using Artificial Neural Networks And Multiple Linear Regression Models, Omar Maghawri Ibrahim Hassan
Dr. Omar Maghawri Ibrahim
Developing models for simulation of barley grain yield is important for making early prediction. To simulate barley grain yield, a simple and advanced modeling techniques were used based on a field experiment that was conducted using 40 foreign barley genetic resources from 2007/08 to 2008/09 winter seasons at Kalubia Governorate, Egypt. The barley genotypes were imported from International Center for Agricultural Research in Dry Areas (ICARDA), Syria. Artificial neural network (ANN) and multiple linear regression (MLR) models were developed to simulate barley grain yield. The models were constructed using the first year of field data and validated with the second …
Super Efficient Irrigation With Buried Clay Pots, David A. Bainbridge
Super Efficient Irrigation With Buried Clay Pots, David A. Bainbridge
David A Bainbridge
Buried clay pot irrigation was first described in an agricultural extension bulletin in China more than 2000 years ago. The clay pot provides demand responsive irrigation at very high efficiency. Clay pot irrigation can be 5-10 times more efficient than conventional irrigation. It is being used more widely in Asia, Africa, Latin American and the US.
Role Of Anthraquinones As A Marker And Maturity In Response To Adventitious Rooting Of Tectona Grandis, Azamal Husen Dr., Sayyada Khatoon
Role Of Anthraquinones As A Marker And Maturity In Response To Adventitious Rooting Of Tectona Grandis, Azamal Husen Dr., Sayyada Khatoon
Dr. Azamal Husen
No abstract provided.
The Philadelphia Award For 1960: Allston Jenkins, James Gross
The Philadelphia Award For 1960: Allston Jenkins, James Gross
James Gross
This biography of Allson Jenkins is part of a collective work for recipients of the Philadelphia Award. Allston Jenkins won the award in 1960 for his efforts in environmental conservation and preservation. He helped preserve the Tinicum Marsh, renamed the John Heinz National Wildlife Refuge, located in Philadelphia, PA and Delaware County.
Pyrite. History, Chemistry, And Metallurgy, Fathi Habashi
Pyrite. History, Chemistry, And Metallurgy, Fathi Habashi
Fathi Habashi
The Book covers the history of pyrite - - how it was a strategic mineral necessary for the production of elemental sulfur needed for making gunpowder for military purposes and for the production of SO2 needed for making sulfuric acid for the chemical industry. Now its presence is a nuisance in tailings ponds. The book also covers the processing of pyrite containing gold, its chemistry and technology, the processing of pyrite cinder for the production of a variety of metals, and its behaviour towards autotrophic microorganisms.
Propiconazole Is A Specific And Accessible Brassinosteroid (Br) Biosynthesis Inhibitor For Arabidopsis And Maize., Burkhard Schulz, Thomas Hartwig, Claudia Corvalan, Norman Best, Joshua Budka, Sunghwa Choe
Propiconazole Is A Specific And Accessible Brassinosteroid (Br) Biosynthesis Inhibitor For Arabidopsis And Maize., Burkhard Schulz, Thomas Hartwig, Claudia Corvalan, Norman Best, Joshua Budka, Sunghwa Choe
Burkhard Schulz
Brassinosteroids (BRs) are steroidal hormones that play pivotal roles during plant development. In addition to the characterization of BR deficient mutants, specific BR biosynthesis inhibitors played an essential role in the elucidation of BR function in plants. However, high costs and limited availability of common BR biosynthetic inhibitors constrain their key advantage as a species-independent tool to investigate BR function. We studied propiconazole (Pcz) as an alternative to the BR inhibitor brassinazole (Brz). Arabidopsis seedlings treated with Pcz phenocopied BR biosynthetic mutants. The steady state mRNA levels of BR, but not gibberellic acid (GA), regulated genes increased proportional to the …
Little Evidence For Local Adaptation To Soils Or Microclimate In The Postfire Recruitment Of Three Californian Shrubs, A Bieger, N Rajakaruna, S P. Harrison
Little Evidence For Local Adaptation To Soils Or Microclimate In The Postfire Recruitment Of Three Californian Shrubs, A Bieger, N Rajakaruna, S P. Harrison
Nishanta Rajakaruna
Background: Seedling recruitment following fire is an infrequent yet critical demographic transition for woody plants in Mediterranean ecosystems. Aims: Here we examine whether post-fire seedling recruitment of three widespread Californian chaparral shrubs is affected by local adaptation within an edaphically and topographically complex landscape. Methods: We reciprocally transplanted 6-month-old seedlings of Adenostema fasciculatum, Ceanothus cuneatus and Eriodictyon californicum to serpentine and sandstone soils, and cool northerly and warm southerly slopes. Results: At the age of 2 years, none of the species manifested higher survival or growth on ‘home’ compared with ‘away’ soils or slopes, indicating an absence of local adaptation …
Edaphic Adaptation Maintains The Coexistence Of Two Cryptic Species On Serpentine Soil, J M. Yost, T Barry, K M. Kay, N Rajakaruna
Edaphic Adaptation Maintains The Coexistence Of Two Cryptic Species On Serpentine Soil, J M. Yost, T Barry, K M. Kay, N Rajakaruna
Nishanta Rajakaruna
• Premise of the study: Divergent edaphic adaptation can contribute to reproductive isolation and coexistence between closely related species, yet we know little about how small-scale continuous edaphic gradients contribute to this phenomenon. We investigated edaphic adaptation between two cryptic species of California wildflower, Lasthenia californica and L. gracilis (Asteraceae), which grow in close parapatry on serpentine soil. • Methods: We reciprocally transplanted both species into the center of each species’ habitat and the transition zone between species. We quantified multiple components of fitness and used aster models to predict fitness based on environmental variables. We sampled soil across the …
Investigation Of The Importance Of Rock Chemistry For Saxicolous Lichen Communities Of The New Idria Serpentinite Mass, San Benito County, California, Usa, N Rajakaruna, K Knudsen, A Fryday, R E. O’Del, N Pope, F C. Olday, S Woolhouse
Investigation Of The Importance Of Rock Chemistry For Saxicolous Lichen Communities Of The New Idria Serpentinite Mass, San Benito County, California, Usa, N Rajakaruna, K Knudsen, A Fryday, R E. O’Del, N Pope, F C. Olday, S Woolhouse
Nishanta Rajakaruna
Although several lichen inventories exist for European ultramafic sites, only four surveys of serpentine lichens for North America have been published to date. Of those, only one has been conducted in California. We conducted a survey of saxicolous lichens from ultramafic rocks (including nephrite, partially serpentinized peridotite, and serpentinite) and non-ultramafic rocks (including silica-carbonate, shale, and sandstone) at the New Idria serpentinite mass, San Benito County, California. X-ray Fluorescence Analysis of the rocks from which the lichens were collected revealed significant elemental differences between the ultramafic and non-ultramafic rocks for 26 of the 32 major and trace elements analyzed. We …
Mycorrhizal Colonization Of Hypericum Perforatum L. (Hypericaceae) On Adjacent Serpentine And Granite Outcrops On The Deer Isles, Maine, Usa, N Davoodian, J Bosworth, N Rajakaruna
Mycorrhizal Colonization Of Hypericum Perforatum L. (Hypericaceae) On Adjacent Serpentine And Granite Outcrops On The Deer Isles, Maine, Usa, N Davoodian, J Bosworth, N Rajakaruna
Nishanta Rajakaruna
Given the paucity of literature on plant-fungal interactions on serpentine soils and limited investigation of serpentine geoecology in eastern North America, we examined mycorrhizal colonization of Hypericum perforatum from adjacent serpentine and granite outcrops on the Deer Isles, ME to determine whether plants were differentially colonized based on substrate. We coincided our sampling with three phenologic stages of H. perforatum (preflowering, flowering, postflowering) to determine possible differences in colonization based on plant phenology. The levels of mycorrhizal colonization in H. perforatum were not significantly different between serpentine and granite sites, while levels of colonization in postflowering plants were significantly higher …
Stressors And Threats To The Flora Of Acadia National Park, Maine: Current Knowledge, Information Gaps, And Future Directions, T B. Harris, N Rajakaruna, S J. Nelson, P D. Vaux
Stressors And Threats To The Flora Of Acadia National Park, Maine: Current Knowledge, Information Gaps, And Future Directions, T B. Harris, N Rajakaruna, S J. Nelson, P D. Vaux
Nishanta Rajakaruna
Stressors and threats to the flora of Acadia National Park, Maine: Current knowledge, information gaps, and future directions. J. Torrey Bot. Soc. 139: 323–344. 2012.— Acadia National Park is a center of plant diversity in northeastern North America. The Park's varied habitats and flora are sensitive to a number of natural and anthropogenic perturbations. Stressors such as invasive plants, pest and pathogens, ozone, acidic fog and sulfur deposition, nitrogen deposition, heavy metals, fire and fire suppression, over-browsing, visitor use, hurricanes, and climate change have all had effects on the Park's habitats and plant species at some point and it is …