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Full-Text Articles in Life Sciences

Canavalia And Dolichos Extracts For Sustainable Pest Biocontrol And Plant Nutrition Improvement In El Salvador, Carlos Martinez Oct 2019

Canavalia And Dolichos Extracts For Sustainable Pest Biocontrol And Plant Nutrition Improvement In El Salvador, Carlos Martinez

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Botanical repellents and pesticides are now being rediscovered as new tools for integrated pest management in order to reduce the use of toxic chemicals in crop production. Canavalia gladiata and Dolichos lablab are two Fabaceae very well adapted to farmlands of El Salvador, effective as living barriers and mostly as cover crops, however, they are not yet very well disseminated. This document describes the potential for using the liquid extracts and the dry flour of raw seeds of those plants for economic benefit and practical convenience for pest management in Salvadorian agriculture under field conditions. Seed extracts were useful when ...


Place-Based Learning Communities On A Rural Campus: Turning Challenges Into Assets, Amy Sprowles, Katlin Goldenberg, P. Dawn Goley, Steve Ladwig, Frank J. Shaughnessy, Kerri J. Malloy, Cutcha R. Baldy, Monty M. Mola, Joshua R. Smith, Mark A. Hemphill-Haley, Melanie J. Michalak, Claire P. Till, Alison P. O'Dowd, Gillian Black, Patricia L. Siering, Eileen Cashman, Alexandru M.F. Tomescu, Matthew P. Hurst, Bori Mazzag, Sonja Manor, Dale R. Oliver, Jeffrey R. Dunk, Jeffrey Abell, Micaela S. Gunther, Andre Buchheister, Ruth Saunders, James Floss, Erin Sullivan, Sarah Ben-Zvi, Matthew D. Johnson Jun 2019

Place-Based Learning Communities On A Rural Campus: Turning Challenges Into Assets, Amy Sprowles, Katlin Goldenberg, P. Dawn Goley, Steve Ladwig, Frank J. Shaughnessy, Kerri J. Malloy, Cutcha R. Baldy, Monty M. Mola, Joshua R. Smith, Mark A. Hemphill-Haley, Melanie J. Michalak, Claire P. Till, Alison P. O'Dowd, Gillian Black, Patricia L. Siering, Eileen Cashman, Alexandru M.F. Tomescu, Matthew P. Hurst, Bori Mazzag, Sonja Manor, Dale R. Oliver, Jeffrey R. Dunk, Jeffrey Abell, Micaela S. Gunther, Andre Buchheister, Ruth Saunders, James Floss, Erin Sullivan, Sarah Ben-Zvi, Matthew D. Johnson

Learning Communities Research and Practice

At Humboldt State University (HSU), location is everything. Students are as drawn to our spectacular natural setting as they are to the unique majors in the natural resource sciences that the university has to offer. However, the isolation that nurtures the pristine natural beauty of the area presents a difficult reality for students who are accustomed to more densely populated environments. With the large majority of our incoming students coming from distant cities, we set out to cultivate a “home away from home” by connecting first-year students majoring in science, technology, engineering and math (STEM) to the communities and local ...


Warm Stratification Increases Germination Of Dendromecon Rigida And Ehrendorferia Chrysantha, Cesar Garcia Jun 2019

Warm Stratification Increases Germination Of Dendromecon Rigida And Ehrendorferia Chrysantha, Cesar Garcia

Electronic Theses, Projects, and Dissertations

We explored the seasonal factors that might play a role in triggering germination of Dendromecon rigidaand Ehrendorferia chrysantha.D. rigida and E. chrysantha have been found difficult to germinate using common greenhouse techniques, Keeley and Fotheringham successfully germinated both species after storing their seeds in the field over a year and treating them with smoke. Identifying the specific seasonally changing factors that stimulated germination could have implications for understanding germination requirements for these and other hard-to-germinate chaparral species.

Dendromecon rigidaand Ehrendorferia chrysanthaare part of the Papaveraceae family and both are found in the chaparral environment in Southern ...


An Overview Of American Ginseng Through The Lens Of Healing, Conservation And Trade, Margaret Wulfsberg May 2019

An Overview Of American Ginseng Through The Lens Of Healing, Conservation And Trade, Margaret Wulfsberg

Lawrence University Honors Projects

American ginseng (Panax quinquefolius) is an herbaceous plant found in the eastern United States and Canada. Due to the high demand for ginseng roots on the Chinese market, it has been harvested at unsustainable rates. If this continues, overharvest along with other environmental factors will lead it to become extinct in the wild. American ginseng became popular due to its similarities with Asian ginseng, (Panax ginseng), a related plant that has been used in Chinese medicine for hundreds of years. Since there is so little Asian ginseng left in the wild, American ginseng now helps satisfy the demand for wild ...


Willis Linn Jepson, James P. Smith Jr., John O. Sawyer Jr. May 2019

Willis Linn Jepson, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


Stand Location Variance As An Indicator Of Disturbance Regime In A Monotypic Tsuga Canadensis Forest, Cole J. Doolittle May 2019

Stand Location Variance As An Indicator Of Disturbance Regime In A Monotypic Tsuga Canadensis Forest, Cole J. Doolittle

Honors Program Projects

Disturbance regimes, which are critical components of forest ecosystems, influence forest morphology, biodiversity, and regeneration. The heterogeneity of disturbance regimes are not well understood on small scales. In this study I analyzed tree cores from five sites within a Tsuga canadensis (Eastern hemlock) forest in northern Wisconsin to investigate disturbance regimes through mean growth release criteria. This study investigated the following questions: 1) Are disturbance regimes in T. canadensis stand level or site specific? 2) If disturbances are site specific, is site location an indicator of disturbance regime? 3) Do site characteristics such as density and tree diameter at breast ...


Dna Barcoding Of Pratylenchus From Agroecosystems In The Northern Great Plains Of North America, Mehmet Ozbayrak May 2019

Dna Barcoding Of Pratylenchus From Agroecosystems In The Northern Great Plains Of North America, Mehmet Ozbayrak

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Pratylenchus species are among the most common plant parasitic nematodes in the Great Plains Region. The objectives of this study were to barcode Pratylenchus specimens for species identification in the Great Plains region using mitochondrial CO1 DNA barcode. In order to (1) determine species boundaries, (2) assess the host associations of barcoded Pratylenchus, (3) to determine the distribution patterns across the Great Plains Region and, (4) to evaluate the species status of P. scribneri and P. hexincisus by a multivariate morphological analysis of haplotype groups identified by DNA barcoding. Soil samples, primarily associated with eight major crops, were collected from ...


Use Of Annual Forage Mixtures In Crop/Livestock Production Systems In Nebraska, Nathan Paul Pflueger May 2019

Use Of Annual Forage Mixtures In Crop/Livestock Production Systems In Nebraska, Nathan Paul Pflueger

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Success of integrating annual forages into crop and livestock systems throughout Nebraska may be variable depending on field location, field/forage crop management, and precipitation. There are many different warm- and cool-season annual forage species available for integrating crop and livestock systems at different times of the year. Mixtures of cereal species, such as oats (Avena sativa)) and spring peas (Pisum sativum)), are often used to optimize forage quantity and forage quality. Our two-year, three location study across Nebraska’s precipitation gradient suggested that forage quantity and quality may vary by location due to different precipitation amounts received during the ...


Establishment Of Perennial Legumes With An Annual Warm-Season Grass As A Companion Crop, Martina N. La Vallie May 2019

Establishment Of Perennial Legumes With An Annual Warm-Season Grass As A Companion Crop, Martina N. La Vallie

Theses, Dissertations, and Student Research in Agronomy and Horticulture

The yields of perennial forage legumes are often hindered during the establishment year due to slow germination rates and weed competition. This study was conducted to determine if sorghum-sudangrass (Sorghum bicolor x S. bicolor var. sudanese) is a compatible annual companion crop for increased forage production, weed suppression, and legume establishment. In 2016, sorghum-sudangrass was paired with alfalfa (Medicago sativa L. ‘Ranger’), birdsfoot trefoil (Lotus corniculatus L.), Illinois bundleflower [Desmanthus illinoensis (Michx.) MacMill. ex B.L. Rob. & Fernald], purple prairie clover (Dalea purpurea Vent.), red clover (Trifolium pratense L.), and roundhead lespedeza (Lespedeza capitata Michx.). We studied effects of a sorghum-sudangrass companion crop with a varying number of harvests (three vs. four harvests) collected per plot throughout the summer and compared yields to the yield of a weeded legume treatment, and a non-weeded legume treatment. In 2017, we studied effects of the application of four seeding rates for sorghum-sudangrass at 5 pure live seed per m2 (PLS/m2), 10 PLS/m2, 20 PLS/m2, and 40 PLS/m2 paired with only the alfalfa perennial legume and compared yields to the yield of an oat-alfalfa control treatment, a weeded alfalfa treatment, and a non-weeded alfalfa treatment. Total dry matter yields along with the yield of each legume, weeds, sorghum-sudangrass, and oats (second year only) were collected for each treatment. In both years, we found the addition of sorghum-sudangrass increased overall dry matter yield and significantly decreased weed abundance. The increase in total dry matter yield came at a cost to the legume yield; as treatments planted with sorghum-sudangrass or oats had lower legume/alfalfa yields than weeded legume/alfalfa treatments. These results suggest that sorghum-sudangrass is ...


A Checklist Of The Families And Genera Of Vascular Plants Of California, James P. Smith Jr., John O. Sawyer Jr. May 2019

A Checklist Of The Families And Genera Of Vascular Plants Of California, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


Vascular Plant Families And Genera Endemic To The Conterminous United States, James P. Smith Jr May 2019

Vascular Plant Families And Genera Endemic To The Conterminous United States, James P. Smith Jr

Botanical Studies

No abstract provided.


Understanding Neglect Of Plant Biology Education In Michigan Middle Schools, Kim Smith May 2019

Understanding Neglect Of Plant Biology Education In Michigan Middle Schools, Kim Smith

All NMU Master's Theses

The purpose of this study was to identify historical trends of neglect in plant biology education, their continuation today in Michigan middle school classrooms, and to uncover reasons for this neglect. A content analysis of state and national science standards and an online survey of Michigan middle school life science teachers were conducted. Findings showed a trend of increasing references in national standards from animals or plants to general organisms, as well as a decrease in the overall number of specific references in the standards. The data also revealed that nearly half of the teachers surveyed spent less than ten ...


Effects Of Amur Honeysuckle On Soil Co2 Emissions, Aidan Shumaker Apr 2019

Effects Of Amur Honeysuckle On Soil Co2 Emissions, Aidan Shumaker

Student Symposium

Lonicera maackii is an invasive woody species found in Ohio and throughout the deciduous forests of eastern United States, taking over habitats of native shrub species such as Lindera benzoin. L. maackii has unique traits compared to deciduous forest natives, showing earlier leaf-out and later leaf senescence, higher leaf nitrogen levels, and faster leaf decomposition. As a result, L. maackii may alter soil conditions through its extended root activity and impacts on microbial decomposition, possibly impacting soil CO2 emissions. As soil microorganisms metabolize organic matter, they release greenhouse gases like CO2 through respiration, which can impact global climate change. Previous ...


Sugar Maple Monitoring Project At Stratford Ecological Center, Jakob Woodside Apr 2019

Sugar Maple Monitoring Project At Stratford Ecological Center, Jakob Woodside

Student Symposium

The sugar maple is one of the most important species of tree in North America for its hard wood and for its sap, which is often tapped and made into maple syrup. The concentration of sugar within its sap becomes increasingly important as demand for the tree increases and production and growth follow suit. Sap only flows after the first thaw of the season, and thus an increase in global temperature could have drastic effects not only on the time at which the sap is harvested, but the overall amount of sap collected as a whole. Thus, an experiment was ...


The Effects Of Shade And Soil Moisture On The Biomass And Growth Rates Of Humulus Japonicus (Japanese Hops), Joshua Stokman Apr 2019

The Effects Of Shade And Soil Moisture On The Biomass And Growth Rates Of Humulus Japonicus (Japanese Hops), Joshua Stokman

Carroll College Student Undergraduate Research Festival

Invasive species are a major problem in the modern world threatening both important ecosystems for conservation as well as our economy. We are looking at the potential for invasion of the species H. Japonicus, quantifying this with the overall growth of the plant. This species has shown signs of increasing its range throughout the United States and could have potential of invading Montana. For this study our independent variables included shade levels and moisture levels with our dependent variables being plant growth. H. Japonicus tends to thrive in full sun riparian environments where there is high accessibility to sunlight as ...


Genome-Wide Association Studies In Maize And Sorghum, Preston Hurst Apr 2019

Genome-Wide Association Studies In Maize And Sorghum, Preston Hurst

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Genome-wide association studies are used to identify genetic variants associated with a particular phenotype. GWAS has been used in a variety of taxa, from humans, to fish to plants . The present analysis is focused on two species important to the human species: maize and sorghum. A GWAS in maize was carried out on the modification of the Ga1-s allele. The Ga1 locus has long been studied as being involved in a unilateral crossing barrier . However, it has long been suspected that the locus is modified by background genetic factors . GWAS was used to observe candidates for this modification. A series ...


A Checklist Of The Vascular Plants Of The Trinity Alps, James P. Smith Jr., John O. Sawyer Jr. Apr 2019

A Checklist Of The Vascular Plants Of The Trinity Alps, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


North America Floras, Manuals, & Checklist: A Bibliography, James P. Smith Jr Apr 2019

North America Floras, Manuals, & Checklist: A Bibliography, James P. Smith Jr

Botanical Studies

No abstract provided.


Vascular Plants Of Horse Mountain (Humboldt County, California), James P. Smith Jr, John O. Sawyer Jr. Apr 2019

Vascular Plants Of Horse Mountain (Humboldt County, California), James P. Smith Jr, John O. Sawyer Jr.

Botanical Studies

No abstract provided.


Vascular Plants Of The Big And Little Duck Lakes (Siskiyou County, California), James P. Smith Jr Apr 2019

Vascular Plants Of The Big And Little Duck Lakes (Siskiyou County, California), James P. Smith Jr

Botanical Studies

No abstract provided.


Vascular Plants Of The Stony Creek Bog Area Del Norte County, California, James P. Smith Jr., John O. Sawyer Jr. Apr 2019

Vascular Plants Of The Stony Creek Bog Area Del Norte County, California, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


A Checklist Of The Vascular Plants Of Scott Mountain, James P. Smith Jr., John O. Sawyer Jr. Apr 2019

A Checklist Of The Vascular Plants Of Scott Mountain, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


Strategies To Overcome Antagonism Of Quizalofop-P-Ethyl When Applied In Mixture With Other Herbicides, Lucas C. Webster Mar 2019

Strategies To Overcome Antagonism Of Quizalofop-P-Ethyl When Applied In Mixture With Other Herbicides, Lucas C. Webster

LSU Master's Theses

A field study was conducted in 2017 and 2018 at the LSU Agricultural Center H. Rouse Caffey Rice Research Station (RRS) near Crowley, LA. to evaluate the influence of different adjuvants in overcoming the antagonism of quizalofop when mixed with bispyribac in Louisiana rice production. The antagonism of quizalofop mixed with bispyribac plus HCOC at 14 DAIT was overcome with a neutral interaction observed at 28 DAIT for barnyardgrass control with an observed control of 91%, compared with an expected control of 97%. The addition of COC, SNS or HCOC into a mixture of quizalofop plus bispyribac provided synergistic or ...


Purification And Characterization Of A Nonspecific Lipid Transfer Protein 1 (Nsltp1) From Ajwain (Trachyspermum Ammi) Seeds, Meshal Nazeer, Humera Waheed, Maria Saeed, Saman Yousuf Ali, M. Iqbal Choudhary, Zaheer Ul-Haq, Aftab Ahmed Mar 2019

Purification And Characterization Of A Nonspecific Lipid Transfer Protein 1 (Nsltp1) From Ajwain (Trachyspermum Ammi) Seeds, Meshal Nazeer, Humera Waheed, Maria Saeed, Saman Yousuf Ali, M. Iqbal Choudhary, Zaheer Ul-Haq, Aftab Ahmed

Pharmacy Faculty Articles and Research

Ajwain (Trachyspermum ammi) belongs to the family Umbelliferae, is commonly used in traditional, and folk medicine due to its carminative, stimulant, antiseptic, diuretic, antihypertensive, and hepatoprotective activities. Non-specific lipid transfer proteins (nsLTPs) reported from various plants are known to be involved in transferring lipids between membranes and in plants defense response. Here, we describe the complete primary structure of a monomeric non-specific lipid transfer protein 1 (nsLTP1), with molecular weight of 9.66 kDa, from ajwain seeds. The nsLTP1 has been purified by combination of chromatographic techniques, and further characterized by mass spectrometry, and Edman degradation. The ajwain nsLTP1 is ...


African Affinity Mask, Giselle M. Strauss Mar 2019

African Affinity Mask, Giselle M. Strauss

Toyon Literary Magazine

N/A


Mass Caffeination, Michael J. Leach Mar 2019

Mass Caffeination, Michael J. Leach

The STEAM Journal

This poem reflects on caffeine intake in modern society from the perspective of a pharmacologist. It is a free verse, concrete poem that communicates the science of caffeine through both words and visual images.


Seasonal Origins Of Soil Water Used By Trees, Scott T. Allen, James W. Kirchner, Sabine Braun, Rolf T. W. Siegwolf, Gregory R. Goldsmith Mar 2019

Seasonal Origins Of Soil Water Used By Trees, Scott T. Allen, James W. Kirchner, Sabine Braun, Rolf T. W. Siegwolf, Gregory R. Goldsmith

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Rain recharges soil water storages and either percolates downward into aquifers and streams or is returned to the atmosphere through evapotranspiration. Although it is commonly assumed that summer rainfall recharges plant-available water during the growing season, the seasonal origins of water used by plants have not been systematically explored. We characterize the seasonal origins of waters in soils and trees by comparing their midsummer isotopic signatures (δ2H) to seasonal isotopic cycles in precipitation, using a new seasonal origin index. Across 182 Swiss forest sites, xylem water isotopic signatures show that summer rain was not the predominant water source for ...


Using Publicly Available Genbank Data To Teach Plant Phylogeny In High School Classrooms, Madhav P. Nepal, Ethan J. Andersen Feb 2019

Using Publicly Available Genbank Data To Teach Plant Phylogeny In High School Classrooms, Madhav P. Nepal, Ethan J. Andersen

iLEARN Teaching Resources

In this teaching module, students will learn about NCBI GenBank, search for DNA/protein sequences from multiple plant species of a gene that encodes Rubisco enzyme, construct and interpret a phylogenetic tree, and discuss traits that allowed plants to adapt their life on land.


Arkansas Soybean Performance Tests 2018, R. D. Bond, J. A. Still, J. F. Carlin Feb 2019

Arkansas Soybean Performance Tests 2018, R. D. Bond, J. A. Still, J. F. Carlin

Research Series

Soybean variety and strain performance tests are conducted each year in Arkansas by the University of Arkansas System Division of Agriculture’s Arkansas Crop Variety Improvement Program. The tests provide information to companies developing varieties and/or marketing seed within the State, and aid the Arkansas Cooperative Extension Service in formulating variety recommendations for soybean producers.


Understanding Greenhouse Gases, Julie M. Mueller, Laura Edwards, Madhav P. Nepal, Larry B. Browning, Matthew L. Miller, P. Troy White Jan 2019

Understanding Greenhouse Gases, Julie M. Mueller, Laura Edwards, Madhav P. Nepal, Larry B. Browning, Matthew L. Miller, P. Troy White

iLEARN Teaching Resources

Students will conduct hands-on experiments to see how greenhouse gases interact with the Earth’s atmosphere and how greenhouse gases affect temperature. This lesson introduces National Geographic’s Geo-Inquiry Process, where students will identify a Geo-inquiry question, collect data, and create a project around the answer to their question. Students will then present their findings to their peers and evaluate their Geo-Inquiry process.