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Articles 1 - 30 of 162023

Full-Text Articles in Life Sciences

Recent Decline Of Lowland Populations Of The Western Gray Squirrel In The Los Angeles Area Of Southern California, Daniel S. Cooper, Alan Muchlinski Jul 2105

Recent Decline Of Lowland Populations Of The Western Gray Squirrel In The Los Angeles Area Of Southern California, Daniel S. Cooper, Alan Muchlinski

Bulletin of the Southern California Academy of Sciences

We provide an overview of the distribution of lowland and otherwise isolated populations of the western gray squirrel (Sciurus griseus) in the Los Angeles area of southern California, an area that has experienced a recent and ongoing invasion by the non-native eastern fox squirrel (Sciurus niger), an urban-adapted species introduced a century ago. Away from its strongholds in the western Santa Monica Mountains, San Gabriel Mountains, and Santa Ana Mountains, the western gray squirrel is resident locally in both the Santa Susana and the Verdugo Mountains, in Griffith Park, in low hills at the eastern periphery of the San Gabriel ...


An Orange Fluorescent Protein Tagging System For Real-Time Pollen Tracking, J. Rice, R. Mundell, R. Millwood, O. Chambers, L. Abercrombie, H. Davies, C. Stewart Dec 2102

An Orange Fluorescent Protein Tagging System For Real-Time Pollen Tracking, J. Rice, R. Mundell, R. Millwood, O. Chambers, L. Abercrombie, H. Davies, C. Stewart

C. Neal Stewart Jr.

Background Monitoring gene flow could be important for future transgenic crops, such as those producing plant-made-pharmaceuticals (PMPs) in open field production. A Nicotiana hybrid (Nicotiana. tabacum × Nicotiana glauca) shows limited male fertility and could be used as a bioconfined PMP platform. Effective assessment of gene flow from these plants is augmented with methods that utilize fluorescent proteins for transgenic pollen identification. Results We report the generation of a pollen tagging system utilizing an orange fluorescent protein to monitor pollen flow and as a visual assessment of transgene zygosity of the parent plant. This system was created to generate a tagged ...


Effect Of External Energy On The Atomic, Crystalline, And Powder Characteristics Of Antimony And Bismuth Powders, Mahendra Kumar Trivedi Sep 2099

Effect Of External Energy On The Atomic, Crystalline, And Powder Characteristics Of Antimony And Bismuth Powders, Mahendra Kumar Trivedi

Mahendra Kumar Trivedi

Next to atoms and molecules the powders are the smallest state of matter available in high purities and large quantities. The effect of any external energy on the shape, morphology and structure can thus be studied with relative ease. The present investigation deals with the effect of a non-contact external energy on the powders of antimony and bismuth. The characteristics of powders treated by external energy are compared with the as received powders (control). The average particle sizes, d50 and d99, the sizes below which 99% of the particles are present showed significant increase and decrease indicating that the energy ...


The Contribution Of Local And Transport Processes To Phytoplankton Biomass Variability Over Different Timescales In The Upper James River, Virginia, Qubin Qin, Jian Shen Sep 2018

The Contribution Of Local And Transport Processes To Phytoplankton Biomass Variability Over Different Timescales In The Upper James River, Virginia, Qubin Qin, Jian Shen

Articles

Although both local processes (photosynthesis, respiration, grazing, and settling), and transport processes (advective transport and diffusive transport) significantly affect local phytoplankton dynamics, it is difficult to separate their contributions and to investigate the relative importance of each process to the local variability of phytoplankton biomass over different timescales. A method of using the transport rate is introduced to quantify the contribution of transport processes. By combining the time-varying transport rate and high-frequency observed chlorophyll a data, we can explicitly examine the impact of local and transport processes on phytoplankton biomass over a range of timescales from hourly to annually. For ...


A New Genus And Two New Species Of Argentine Rhinotragini (Coleoptera, Cerambycidae, Cerambycinae), James E. Wappes, Antonio Santos-Silva Apr 2018

A New Genus And Two New Species Of Argentine Rhinotragini (Coleoptera, Cerambycidae, Cerambycinae), James E. Wappes, Antonio Santos-Silva

Insecta Mundi

Rhopalessa irwini sp.nov. and Rhinion parkeri gen. nov., sp. nov. (Coleoptera, Cerambycidae, Cerambycinae, Rhinotragini) are described from Argentina. A key to species of Rhopalessa is provided.


The Manuscript Works Of S. Fred Prince (1857-1951), Sarah Burke Cahalan, Jason W. Dean Apr 2018

The Manuscript Works Of S. Fred Prince (1857-1951), Sarah Burke Cahalan, Jason W. Dean

Marian Library/IMRI Faculty Publications

S. Fred Prince, a botanical illustrator and amateur scientist, is a largely unknown artist whose work on the American landscape demonstrates his eligibility to be considered in the lineage of self-taught illustrator-naturalists such as Mark Catesby and Genevieve Jones. In this article, we present a survey of extant Prince materials identified at time of writing, describing their contents and physical characteristics. Beyond this survey and description, we also provide a biographical sketch and timeline of Prince's life.


Altering Oligomerization Of Epha2 Via Mutations In The Intracellular Domain, Ryan W. Lingerak Jan 2018

Altering Oligomerization Of Epha2 Via Mutations In The Intracellular Domain, Ryan W. Lingerak

Honors Research Projects

Eph receptor tyrosine kinases (RTKs) are activated by membrane-bound ligands called ephrins. Eph RTKs are divided into two subclasses, each activated by a specific classes of the ligand ephrin. The overexpression of Eph receptors is correlated to cancer cell metastasis in several different types of cancers. Studies with the EphA2 extracellular domain (ECD) and ephrinA1 ligand have shown that upon binding of ephrin to the receptor, EphA2 undergoes increased oligomerization and activation. This indicates that oligomerization is intimately connected to kinase activity. High resolution crystal structures of the EphA2 ECD have revealed some details of these ligand bound oligomers, as ...


Potential For Climate Induced Methane Hydrate Dissociation, Graham Macwilliams Jan 2018

Potential For Climate Induced Methane Hydrate Dissociation, Graham Macwilliams

Pomona Senior Theses

Methane hydrates are frozen deposits of methane and water found in high pressure or low temperature sediments. When these deposits destabilize, large quantities of methane can be emitted into the atmosphere. This is significant to climate change because methane has 25 times more greenhouse gas potential than Carbon Dioxide. Worldwide, it is estimated there are between 2500 and 10000 gigatons of methane stored in hydrate deposits. This represents more carbon than all fossil fuels on Earth. It is estimated that between 200 and 2000 gigatons of methane are stored in hydrates in Arctic waters acutely vulnerable to greenhouse warming. Over ...


Economic Growth And Changes In Forested Areas In Southeast Asia: Is Environmental Kuznets Curve Still Relevant?, Lan Thi Ngoc Nguyen Jan 2018

Economic Growth And Changes In Forested Areas In Southeast Asia: Is Environmental Kuznets Curve Still Relevant?, Lan Thi Ngoc Nguyen

Undergraduate Honors Theses

The environmental history of the twentieth century in Southeast Asia reveals tremendous loss of forested areas as a consequence of unprecedented economic transformations and unrestrained globalization. Featuring some of the world’s fastest-growing economies, Southeast Asia has been experiencing fundamental changes in its economic structure, sociopolitical institutions, and the rate of natural resources extraction and depletion, including deforestation. This study reexamines evidence of the (EKC) hypothesis in light of the deforestation the above region experienced over the period 1990-2013. We use the change in forest cover as an indicator for environmental degradation. A panel co-integration approach is invoked to investigate ...


Tea Induction Of Cyp6a8 Promoter In Drosophila Melanogaster, Fiona Retzer Dec 2017

Tea Induction Of Cyp6a8 Promoter In Drosophila Melanogaster, Fiona Retzer

University of Tennessee Honors Thesis Projects

No abstract provided.


The Effects Of Continuous Insulin Pump Therapy On Glycemic Control In Pregnant Type 1 Diabetics, Kimberly Kelsey Dec 2017

The Effects Of Continuous Insulin Pump Therapy On Glycemic Control In Pregnant Type 1 Diabetics, Kimberly Kelsey

Senior Theses and Capstone Projects

Type 1 Diabetics have various ways of managing their diabetes that have been studied for their effectiveness. Pregnancy in the Type 1 Diabetic has been understudied. It is known that Diabetics in general have poorer pregnancy outcomes because of poor glycemic control. This coupled with the fact that the body needs 3-4 times more insulin as pregnancy comes to an end makes managing blood glucose levels challenging for diabetics (Lowdermilk, 2016, p. 689). For the Type 1 Diabetic, there are two main ways to control diabetes: multiple daily injections using at least two type of insulin and continuous subcutaneous insulin ...


Plasma Fibroblast Growth Factor-21 Levels In Patients With Inborn Errors Of Metabolism, Brian Kirmse, Juan Cabrera-Luque, Omar Ayyub, Kristina Cusmano-Ozog, Kimberly A. Chapman, Marshall L. Summar Dec 2017

Plasma Fibroblast Growth Factor-21 Levels In Patients With Inborn Errors Of Metabolism, Brian Kirmse, Juan Cabrera-Luque, Omar Ayyub, Kristina Cusmano-Ozog, Kimberly A. Chapman, Marshall L. Summar

Pediatrics Faculty Publications

Fibroblast growth factor-21 (FGF21) levels are elevated in patients with primary mitochondrial disorders but have not been studied in patients with inborn errors of metabolism (IEM) known to have secondary mitochondrial dysfunction. We measured plasma FGF21 by ELISA in patients with and without IEM. FGF21 levels were higher in patients with IEM compared to without IEM (370 pg/dL vs. 0–65 pg/dL). Further study of FGF21 as a biomarker in IEM is warranted.


Superresolution Imaging Identifies That Conventional Trafficking Pathways Are Not Essential For Endoplasmic Reticulum To Outer Mitochondrial Membrane Protein Transport., Kyle Salka, Shivaprasad Bhuvanendran, Kassandra Wilson, Petros Bozidis, Mansi Mehta, Kristin Rainey, Hiromi Sesaki, George H Patterson, Jyoti K. Jaiswal, Anamaris M. Colberg-Poley Dec 2017

Superresolution Imaging Identifies That Conventional Trafficking Pathways Are Not Essential For Endoplasmic Reticulum To Outer Mitochondrial Membrane Protein Transport., Kyle Salka, Shivaprasad Bhuvanendran, Kassandra Wilson, Petros Bozidis, Mansi Mehta, Kristin Rainey, Hiromi Sesaki, George H Patterson, Jyoti K. Jaiswal, Anamaris M. Colberg-Poley

Genomics and Precision Medicine Faculty Publications

Most nuclear-encoded mitochondrial proteins traffic from the cytosol to mitochondria. Some of these proteins localize at mitochondria-associated membranes (MAM), where mitochondria are closely apposed with the endoplasmic reticulum (ER). We have previously shown that the human cytomegalovirus signal-anchored protein known as viral mitochondria-localized inhibitor of apoptosis (vMIA) traffics from the ER to mitochondria and clusters at the outer mitochondrial membrane (OMM). Here, we have examined the host pathways by which vMIA traffics from the ER to mitochondria and clusters at the OMM. By disruption of phosphofurin acidic cluster sorting protein 2 (PACS-2), mitofusins (Mfn1/2), and dynamin related protein 1 ...


Characterisation Of Cold Plasma Treated Beef And Dairy Lipids Using Spectroscopic And Chromatographic Methods, Chaitanya Sarangapani, David Dorran, Julie Dunne, Paula Bourke, Patrick Cullen Nov 2017

Characterisation Of Cold Plasma Treated Beef And Dairy Lipids Using Spectroscopic And Chromatographic Methods, Chaitanya Sarangapani, David Dorran, Julie Dunne, Paula Bourke, Patrick Cullen

Articles

The efficacy of cold plasma for inactivation of food-borne pathogens in foods is established. However, insights on cold plasma-food interactions in terms of quality effects, particularly for oils and fats, are sparse. This study evaluated plasma-induced lipid oxidation of model matrices, namely dairy and meat fats. Product characterisation was performed using FTIR, 1H NMR and chromatographic techniques. The oxidation of lipids by cold plasma followed the Criegee mechanism and typical oxidation products identified included ozonides, aldehydes (hexanal, pentenal, nonanal and nonenal) and carboxylic acids (9-oxononanoic acid, octanoic acid, nonanoic acid), along with hydroperoxides (9- and 13-hydroperoxy-octadecadienoylglycerol species). However, these ...


Endothelial Cells, Bennie Liu Nov 2017

Endothelial Cells, Bennie Liu

Bennie Liu

Endothelial cells form the inner lining of a blood vessel and provides an anticoagulant barrier between the vessel wall and blood. Endothelial cells also generate an antithrombotic surface that facilitates transit of plasma and cellular constituents throughout the vasculature. As a selective permeability barrier, the endothelial cell is a unique multifunctional cell with critical basal and inducible metabolic and synthetic functions. The endothelial cell reacts with physical and chemical stimuli within the circulation and regulates hemostasis, vasomotor tone, and immune and inflammatory responses. In addition, the endothelial cell is pivotal in angiogenesis and vasculogenesis.


Building Academic/Practitioner Teams For Human Rights Projects: Examples, Lessons Learned, And Pitfalls To Avoid, Theresa Harris Nov 2017

Building Academic/Practitioner Teams For Human Rights Projects: Examples, Lessons Learned, And Pitfalls To Avoid, Theresa Harris

The Social Practice of Human Rights: Charting the Frontiers of Research and Advocacy

Academics are increasingly interested in getting out of their classrooms and labs to contribute their knowledge, expertise, and resources to help communities develop evidence-based policies. In addition to post-election initiatives such as the March for Science and 314 Action, many academics are joining “without borders”-type programs and organizations that connect academics with opportunities to volunteer their time and talents for “social good.”

One of the longest-running of these is On-call Scientists, an initiative of the American Association for the Advancement of Science (AAAS) that connects human rights organizations with pro bono scientists across all fields — life, physical, behavioral, and ...


Organismal Composition And Photosynthetic Traits Of Biological Soil Crusts In Prairie Ecosystems Of The Great Plains, Brendon C. Mccampbell Nov 2017

Organismal Composition And Photosynthetic Traits Of Biological Soil Crusts In Prairie Ecosystems Of The Great Plains, Brendon C. Mccampbell

Masters Theses

Biological soil crusts (BSCs) are soil-surface microecosystems composed of a close association of algae, cyanobacteria, fungi, lichens, and non-vascular plants with soil particles. BSCs have several ecological functions including carbon fixation, nitrogen fixation, nutrient relations, soil stabilization, water relations, and floral community development, which make them extremely important in many of the ecosystems where they occur. While BSCs have been studied throughout the American West, little work has been done in the Great Plains region where they are less prominent among the dominant vascular plant communities. This study examined organismal composition and photosynthetic traits of BSCs in four ecosystems within ...


Functional Analysis Of Drosophila Integrator Complex In Snrna 3' End Processing, Jiandong Chen Oct 2017

Functional Analysis Of Drosophila Integrator Complex In Snrna 3' End Processing, Jiandong Chen

Jiandong Chen

Uridine-rich small nuclear RNAs (U snRNAs) play essential roles in eukaryotic gene expression by facilitating the removal of introns from mRNA precursors and the processing of the replication-dependent histone pre-mRNAs. Formation of the 3’ end of these snRNAs is carried out by a poorly characterized, twelve-membered protein complex named Integrator Complex.

In the effort to understand Integrator Complex function in the formation of the snRNA 3’ end, we performed a functional RNAi screen in Drosophila S2 cells to identify protein factors required for snRNA 3’ end formation. This screen was conducted by using a fluorescence-based reporter that elicits GFP expression ...


2017, October - Recommendations To Address The Expansion Of Seawater Intrusion In The Salinas Valley Groundwater Basin Oct 2017

2017, October - Recommendations To Address The Expansion Of Seawater Intrusion In The Salinas Valley Groundwater Basin

Monterey County Water Resources Agency Engineering Reports

This report provides a discussion of the current knowledge and related background information surrounding seawater intrusion pathways and potential impacts thereof on the Salinas Valley Groundwater Basin. The report also serves as a body of evidence to catalogue the findings used to support the six recommendations presented. Each recommendation can be implemented on its own or in concert with the others, and the relative importance of each is discussed individually in this report. However, the recommendations are conceptualized as a comprehensive solution that, along with continued operation of projects that have been constructed for the same purpose, have the strongest ...


Food Insecurity: Rudimentary Education For Local Youth (Firefly), Nam-Anh Nguyen, Quynh P. Nguyen, Jane E. Krause Oct 2017

Food Insecurity: Rudimentary Education For Local Youth (Firefly), Nam-Anh Nguyen, Quynh P. Nguyen, Jane E. Krause

Purdue Journal of Service-Learning and International Engagement

As service-learning becomes recognized as a significant teaching-learning tool for college students, the authors of this article came together to apply for the Purdue University Service-Learning Sustainability Projects Grant. Upon receiving the grant, with the encouragement of Professor Jane Krause and Food Finders Food Bank, the student authors created a project focused on food insecurity education in West Lafayette, Indiana. The main objective was to develop and teach a series of lessons on food insecurity and sustainability to middle school students using interactive activities. A team of Purdue students from various backgrounds was recruited to assist in planning and to ...


Water Supply In Developing Countries: Student Experiences In The Dominican Republic, Albert Alwang, Margaret Busse, Audrey Caprio, Marieke Fenton, Jason Hawes, Andrew Kanach, Autumn Mcelfresh-Sutton Oct 2017

Water Supply In Developing Countries: Student Experiences In The Dominican Republic, Albert Alwang, Margaret Busse, Audrey Caprio, Marieke Fenton, Jason Hawes, Andrew Kanach, Autumn Mcelfresh-Sutton

Purdue Journal of Service-Learning and International Engagement

In 2010, the United Nations established access to safe drinking water as a basic human right; however, many areas around the globe still lack access. The interdisciplinary service-learning course “Water Supply in Developing Countries” was established at Purdue in 2012 to address the complex issue of water insecurity around the world. Over the past five years, the course has produced teams involving students from nursing, engineering, agricultural economics, biology, and food science working together to develop sustainable, community-scale drinking water treatment systems. In partnership with Aqua Clara International, the student team in 2017 established a drinking water treatment system at ...


The Pentatomoidea (Hemiptera) Of Northeastern North America With Emphasis On The Fauna Of Illinois. J. E. Mcpherson. 240 Pages. Southern Illinois University Press, Carbondale, 1982. $30.00., A. G. Wheeler Jr. Oct 2017

The Pentatomoidea (Hemiptera) Of Northeastern North America With Emphasis On The Fauna Of Illinois. J. E. Mcpherson. 240 Pages. Southern Illinois University Press, Carbondale, 1982. $30.00., A. G. Wheeler Jr.

The Great Lakes Entomologist

(excerpt)

Among the most conspicuous of the true bugs are the pentatomoid Hemiptera, stink bugs and their relatives, many of which are large, or moderately so, and brightly colored. Unwary berry pickers probably can recount an unpleasant experience with fruit tainted by the noisome odor of a stink bug, and the characteristic, barrel-shaped eggs of most Pentatomidae, often ornate and arranged in neat rows, have evoked the wonderment of naturalists and prompted numerous technical descriptions from entomologists. Contributing to the importance of this group are the crop losses inflicted by certain plant-feeding species and the destruction of insect pests by ...


First Report Of The Leafhopper Graminella Fitchii For Michigan (Homoptera: Cicadellidae), Oscar Taboada Oct 2017

First Report Of The Leafhopper Graminella Fitchii For Michigan (Homoptera: Cicadellidae), Oscar Taboada

The Great Lakes Entomologist

(excerpt)

While working on a leafhopper project I came across four specimens of Graminella fitchii (Van Duzee) in the Entomology Museum, Department of Entomology, Michigan State Uni- versity, and five specimens in the Museum of Zoology, The University of Michigan.


Description Of A New Species Of Paradamoetas (Araneae: Salticidae), With A Revised Key To The Genus, Bruce Cutler Oct 2017

Description Of A New Species Of Paradamoetas (Araneae: Salticidae), With A Revised Key To The Genus, Bruce Cutler

The Great Lakes Entomologist

Paradamoetas changuinola new species, is described. The range of this antlike genus of jumping spiders is extended south to Panama. A revised key to the four specics currently recognized is presented.


New Records For Ectoparasites Of Michigan Bats, S. B. Dood, A. Kurta Oct 2017

New Records For Ectoparasites Of Michigan Bats, S. B. Dood, A. Kurta

The Great Lakes Entomologist

During 1978, 1979, and 1981 ectoparasites of bats were collected in 16 counties of the Upper and Lower peninsulas in connection with an extensive study of Michigan bat populations (Kurta 1980, 1982). The two insect and five acarine species recovered include four new records for Michigan and two new host records for the United States. All are listed with comments on past records of Michigan bat ectoparasites.


Diurnal And Seasonal Activity Of Female Mutillids On A Michigan Sand Flat (Hymenoptera: Mutillidae), David A. Evans Oct 2017

Diurnal And Seasonal Activity Of Female Mutillids On A Michigan Sand Flat (Hymenoptera: Mutillidae), David A. Evans

The Great Lakes Entomologist

Diurnal activity of mutillid females of a southwestern Michigan sand area was characterized in relation to sand surface temperature conditions. Seasonal abundance patterns weredetermined for four Dasymutilla species.


Susceptibility Of White Spruce Seed Sources To Yellowheaded Spruce Sawfly, Pikonema Alaskensis,(Hymenoptera: Tenthredinidae), Michael D. Connor, Mark W. Houseweart, Herbert M. Kulman Oct 2017

Susceptibility Of White Spruce Seed Sources To Yellowheaded Spruce Sawfly, Pikonema Alaskensis,(Hymenoptera: Tenthredinidae), Michael D. Connor, Mark W. Houseweart, Herbert M. Kulman

The Great Lakes Entomologist

A field caging technique was used to test the susceptibility of 25 white spruce, Picea glauca (Moench) Voss, seed sources to attack by Pikonema alaskensis (Rohwer). No sig- nificant differences were found in the number of eggs laid, number of dessicated eggs, or number of egg slits. Percent oviposition differed significantly within a tree, the south side having more eggs. Bud size differed significantly within trees and between trees but not between seed sources. The number of sawfly eggs laid on a bud could not be related to bud size. There was no significant difference in susceptibility of the seed ...


Notes On Shifting Distribution Patterns And Survival Of Immature Danaus Plexippus (Lepidoptera: Danaidae) On The Food Plant Asclepias Syriaca, Susan Sullivan Borkin Oct 2017

Notes On Shifting Distribution Patterns And Survival Of Immature Danaus Plexippus (Lepidoptera: Danaidae) On The Food Plant Asclepias Syriaca, Susan Sullivan Borkin

The Great Lakes Entomologist

Abundance and distribution of immature stages of the monarch butterfly, Danaus plexippus, on the food plant Asclepias syriaca were examined at a site in southeastern Wisconsin over one growing season. Estimated mortality for eggs and larvae was substantial (88%). Dispersal of larvae between individual food plants, along with egg and larval mortality factors, may result in low population density. Although the mechanism triggering larval dispersal is unknown, several alternative hypotheses are proposed for further examination.


Gypsy Moth (Lepidoptera: Lymantriidae): History Of Eradication Efforts In Michigan, 1954-1981, Murray Hanna Oct 2017

Gypsy Moth (Lepidoptera: Lymantriidae): History Of Eradication Efforts In Michigan, 1954-1981, Murray Hanna

The Great Lakes Entomologist

Gypsy moth, Lymantria dispar, was first discovered in Michigan in 1954, Aerial spraying operations were conducted to eradicate gypsy moth infestations with synthetic insecticides (DDT, carbaryl, and diflubenzuron),


Biological Characteristics That Make The Lesser Peachtree Borer (Lepidoptera: Sesiidae) A Pest On Peach Trees, R. H. Meyer Oct 2017

Biological Characteristics That Make The Lesser Peachtree Borer (Lepidoptera: Sesiidae) A Pest On Peach Trees, R. H. Meyer

The Great Lakes Entomologist

The lesser peachtree borer, Synanthedon pictipes, is a native insect with well distributed hosts near peach orchards, which has high mobility between sylvatic and domestic hosts. It is able to take advantage of the susceptibility of the peach tree to periodic freeze injury and disease cankers. The moth stage is present through most of the growing season and effectively conceals the eggs singly at the most favorable sites for larval success.