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Articles 31 - 49 of 49
Full-Text Articles in Life Sciences
Mathematical Biology At An Undergraduate Liberal Arts College, Stephen C. Adolph, Lisette G. De Pillis
Mathematical Biology At An Undergraduate Liberal Arts College, Stephen C. Adolph, Lisette G. De Pillis
All HMC Faculty Publications and Research
Since 2002 we have offered an undergraduate major in Mathematical Biology at Harvey Mudd College. The major was developed and is administered jointly by the mathematics and biology faculty. In this paper we describe the major, courses, and faculty and student research and discuss some of the challenges and opportunities we have experienced.
Bacterial Acquisition In Juveniles Of Several Broadcast Spawning Coral Species, Koty H. Sharp, Kim B. Ritchie
Bacterial Acquisition In Juveniles Of Several Broadcast Spawning Coral Species, Koty H. Sharp, Kim B. Ritchie
Arts & Sciences Faculty Publications
Coral animals harbor diverse microorganisms in their tissues, including archaea, bacteria, viruses, and zooxanthellae. The extent to which coral-bacterial associations are specific and the mechanisms for their maintenance across generations in the environment are unknown. The high diversity of bacteria in adult coral colonies has made it challenging to identify species-specific patterns. Localization of bacteria in gametes and larvae of corals presents an opportunity for determining when bacterial-coral associations are initiated and whether they are dynamic throughout early development. This study focuses on the early onset of bacterial associations in the mass spawning corals Montastraea annularis, M. franksi, M. faveolata, …
Introduction: Protistan Biology, Horizontal Gene Transfer, And Common Descent Uncover Faulty Logic In Intelligent Design, Avelina Espinosa
Introduction: Protistan Biology, Horizontal Gene Transfer, And Common Descent Uncover Faulty Logic In Intelligent Design, Avelina Espinosa
Arts & Sciences Faculty Publications
THE International Society of Protistologists (ISOP) organized a pre-meeting workshop entitled ‘‘Horizontal Gene Transfer and Phylogenetic Evolution Debunk Intelligent Design,’’ as part of the 1st North American Section meeting held June 11–13, 2009, at Roger Williams University, Bristol, RI, USA. This workshop focused on the acceptance of Darwinian evolution in the United States and the role of intelligent design (ID) in the ongoing controversy between scientific knowledge and popular belief. Intelligent design, a doctrine born in the 1980s, proposes that a ‘‘Designer’’ is responsible for the complexity in biological systems and that Darwinism cannot explain holistically the origin and evolution …
Ecological System Meets 'Digital Ecosystem': Can Ict Benefit From Understanding Biology?, Robert J. Whelan
Ecological System Meets 'Digital Ecosystem': Can Ict Benefit From Understanding Biology?, Robert J. Whelan
Faculty of Science - Papers (Archive)
The description of a digital ecosystem as a “loosely coupled, demand-driven, domain clustered, agent-based, self organised, collaborative environment where agents form temporary coalitions for a specific purpose or goal, and each is proactive and responsive for its own benefit” has intriguing similarities with the definition of an ecosystem in ecology. Perhaps the similarities suggest that a deeper understanding of ecology may benefit the further development of ICT, and any differences may therefore represent cautionary tales. In this presentation, I describe characteristics of some ecological systems at several levels-from species to ecosystem-and speculate on the potential of these examples to catalyse …
Full Issue: Volume 3, Number 1
Full Issue: Volume 3, Number 1
The Science Journal of the Lander College of Arts and Sciences
No abstract provided.
Full Issue: Volume 4, Number 1
Full Issue: Volume 4, Number 1
The Science Journal of the Lander College of Arts and Sciences
No abstract provided.
Lifelines Winter 2010, Southern Adventist University
Lifelines Winter 2010, Southern Adventist University
Lifelines - Biology Department Newsletter
The Winter 2010 issue of Lifelines features articles on research done in the Southern Connections class, the retirement of Dr. David Ekkens, the death of Dr. Richard Seidel, the Allied Health Club's service projects, and a pictorial directory of the 2010 biology and allied health graduates.
Review Of The Species Of Gugolzia Delucchi And Steffan (Hymenoptera: Pteromalidae) In Europe And Turkey, With Descriptions Of New Species, Mi̇kdat Doğanlar, Oğuzhan Doğanlar
Review Of The Species Of Gugolzia Delucchi And Steffan (Hymenoptera: Pteromalidae) In Europe And Turkey, With Descriptions Of New Species, Mi̇kdat Doğanlar, Oğuzhan Doğanlar
Turkish Journal of Zoology
The species of Gugolzia (Hymenoptera: Chalcidoidea, Pteromalidae) in Europe and Turkey were reviewed, and an identification key for differentiating the species is provided. Newly discovered diagnostic characters of the genus were added to the diagnoses given by earlier authors. Species were recorded as parasitoids of phytophagous Eurytomidae (Hymenoptera: Chalcidoidea). New host and distributions are for Gugolzia harmolitae, which was reared from Tetramesa romana feeding on shoots of Arundo donax (Poaceae), Gugolzia karadagae n.sp. from Eurytoma plotnikovi feeding on fruits of Pistacia vera together with Megastigmus pistaciae (Chalcidoidea: Torymidae) in Gaziantep province, and Gugolzia melengicia n.sp. from fruits of Pistacia terebinthi …
Bryostatins: Biological Context And Biotechnological Prospects, Amaro E. Trindade-Silva, Grace E. Lim-Fong, Koty H. Sharp
Bryostatins: Biological Context And Biotechnological Prospects, Amaro E. Trindade-Silva, Grace E. Lim-Fong, Koty H. Sharp
Arts & Sciences Faculty Publications
Coral animals harbor diverse microorganisms in their tissues, including archaea, bacteria, viruses, and Bryostatins are a family of protein kinase C modulators that have potential applications in biomedicine. Found in miniscule quantities in a small marine invertebrate, lack of supply has hampered their development. In recent years, bryostatins have been shown to have potent bioactivity in the central nervous system, an uncultivated marine bacterial symbiont has been shown to be the likely natural source of the bryostatins, the bryostatin biosynthetic genes have been identified and characterized, and bryostatin analogues with promising biological activity have been developed and tested. Challenges in …
Differences In Hydraulic Conductance (Kh) As A Function Of Leaf Area (Ks Leaf) And Xylem Size (Ks Xylem) In Encelia Californica And Venegasia Carpesioides, Tony Audin, Andrew Dudley, Janel Gonzalez
Differences In Hydraulic Conductance (Kh) As A Function Of Leaf Area (Ks Leaf) And Xylem Size (Ks Xylem) In Encelia Californica And Venegasia Carpesioides, Tony Audin, Andrew Dudley, Janel Gonzalez
Featured Research
Southern California and the Santa Monica Mountains experience a climate similar to that of the Mediterranean basin. This means hot, dry summers, mild, wet winters, and large amounts of plant diversity. A major issue that can affect these regions is water availability and processing. To demonstrate this, hydraulic conductance (Kh) was measured as a function of leaf area (KS Leaf) and xylem size (KS Xylem). Two vascular plants were used for this study, Encelia californica and Venegasia carpesioides. This is because they are similar morphologically but are different genus and species. It was hypothesized that the larger plant (V. carpesioides) …
The Affect Of Temperature On The Fluorescence Of Heteromeles Arbutifolia (Hollywood) In The Santa Monica Mountains, Patrick Y. Chisum, Adam S. Graham, Arthur C. Sanders
The Affect Of Temperature On The Fluorescence Of Heteromeles Arbutifolia (Hollywood) In The Santa Monica Mountains, Patrick Y. Chisum, Adam S. Graham, Arthur C. Sanders
Featured Research
Presented here is a comparison of the predawn fluorescence of adult Heteromeles arbutifolia growing on the Pepperdine Seaver campus next to the lacrosse field, and adult Heteromeles growing in Tapia canyon. The analysis of the leaf temperature measured by an IR thermometer showed an average of 9.32°C drop when measuring plants in Tapia canyon compared to those growing on the warmer Pepperdine campus. The air temperature measured by the Kestrel and IR thermometer showed Tapia canyon being an average of 7.27°C colder than predawn measurements on Pepperdine campus. Finally, the fluorescence of the plants in both locations was measured using …
Tensile Strength Of Malosma Laurina Leaves In Wet And Dry Conditions, T. Candelore, N. Despenza, L. Garrison, L. Hinther
Tensile Strength Of Malosma Laurina Leaves In Wet And Dry Conditions, T. Candelore, N. Despenza, L. Garrison, L. Hinther
Featured Research
Pepperdine University is one located in one of the most diverse places of the world. It is located in the Mediterranean which occupies less than 5% of the earth's landmass and is only found in five areas which includes California. On the campus there are several canyons. One of the canyons is called Winter Canyon. The canyon contained a plant called Malosma laurina which is located in a riparian environment and a chaparral environment. The plant grows in both areas however, our hypothesis was that the dry plants' leaves would demonstrate more plasticity. The soil humidity was also measured to …
Effect Of Fertilizer On Leaf Tensile Strength In Salvia Leucophylla, Tawny Lindahl, John Buie, Eiichiro Uemura
Effect Of Fertilizer On Leaf Tensile Strength In Salvia Leucophylla, Tawny Lindahl, John Buie, Eiichiro Uemura
Featured Research
This experiment sought to establish a connection between short term growth in Salvia leucophylla found in Southern California and nutrient availability in the soil. It was hypothesized that adding artificially produced nutrient mix Miracle Grow would increase the strength of the leaves in the herb after one week of addition. Newer leaves were tested in the Instron device for tensile strength after one week, and after data analysis, it was concluded that there was no difference in tensile strength of leaves treated with fertilizer compared with leaves without fertilizer.
Comparing Leaf Properties Of Inland And Coastal Malosma Laurina In The Santa Monica Mountains, Rosemary Busch Conn, Lauren Parker, Brittany Sawrey
Comparing Leaf Properties Of Inland And Coastal Malosma Laurina In The Santa Monica Mountains, Rosemary Busch Conn, Lauren Parker, Brittany Sawrey
Featured Research
Our group chose Malosma laurina, commonly known as Laurel Sumac, to observe and test. We hypothesized that there would be difference in photosynthetic trade-offs and capabilities between coastal and inland populations, specifically with respect to leaves. This was based on the low freezing tolerance in Malosma laurina (Pratt et al. 2005), and hypothesized that based on this stress, resources would be allocated differently in inland leaves than in coastal leaves. This hypothesis was tested using the indices of Normalized Difference Vegetation Index (NDVI), the Photochemical Reflectance Index (PRI), the ratio of green to red reflectance, and Leaf Specific Area …
Post-Fire Alterations In Mechanical Strength Of Leaves In Heteromeles Arbutifolia, Andrew Hair, Madeline Dilascia, Nick Novella, Taylor Wurdeman
Post-Fire Alterations In Mechanical Strength Of Leaves In Heteromeles Arbutifolia, Andrew Hair, Madeline Dilascia, Nick Novella, Taylor Wurdeman
Featured Research
Wildfires in the Santa Monica mountains in Southern California burn down a decent percentage of the local vegetation. However, some plants like Heteromeles Arbutifolia, are considered to be resprouters because they return a mere two years after being burnt down. It is hypothesized that the artificially browsed resprout leaves will have a lower tensile strength than both the young and adult leaves because they use a lower amount of carbohydrates per unit-leaf-area. Data showed that although there was a slight different between the young leaves and the adult leaves of the Heteromeles, there was no statistically significant difference between the …
A Comparison Of The Tensile Strength Of Leaves In Encelia Californica In Canyon And Beach Species, Anna Chowaniec, Annie Lee, Hayley Springs
A Comparison Of The Tensile Strength Of Leaves In Encelia Californica In Canyon And Beach Species, Anna Chowaniec, Annie Lee, Hayley Springs
Featured Research
Our research is concerned with the further exploration of leaf biomechanics, a relatively unexamined field. The purpose of this experiment was to find a correlation between environmental stress factors and tensile strength of leaves of Encelia californica. We hypothesized the beach species would have a higher tensile strength than canyon species. After evaluating data collected from both Pepperdine’s Presidents Canyon and Malibu beach we found that while the canyon species could withstand a higher maximum load of force, there was no difference between the canyon and the beach species with leaf area taken into account. Using Young’s Modulus, we …
Effect Of Petiole-To-Branchlet Angle On Tensile Stress And Tensile Strength In Heteromeles Arbutifolia, Matt W. Andrus, Anthony P. Lisankis, Valen C. Anderson
Effect Of Petiole-To-Branchlet Angle On Tensile Stress And Tensile Strength In Heteromeles Arbutifolia, Matt W. Andrus, Anthony P. Lisankis, Valen C. Anderson
Featured Research
Heteromeles arbutifolia an important chaparral species of southern California, Is a food source for mule deer (Odocoileus hemionus). This predation has become more pronounced as the climate shifts to hotter, drier, and longer summers. Other species that the deer normally feed on cannot survive these harsh conditions, while Heteromeles arbutifolia is able to persevere (Letourneau, 2004). We decided that there must be mechanisms involved in the petiole of leafs to keep them from being pulled off by deer and strong winds. Our group hypothesized that as the angle between the petiole and branchlet increased, the tensile strength of the petiole …
Root Tensile Strength In A Native And Non-Native Species Of The Coastal Chaparral Community, Jamie Elmquist, Andrea Lim, Amanda Scholl, Amanda Vest
Root Tensile Strength In A Native And Non-Native Species Of The Coastal Chaparral Community, Jamie Elmquist, Andrea Lim, Amanda Scholl, Amanda Vest
Featured Research
Non-native species are regularly introduced into environments in which they replace existing native species and drastically influence the ecological characteristics of the area and the habitat of the living organisms surrounding them. In the botanical field of study, invasive plant species can choke out native species thus making them endangered or extinct. Specifically in the Santa Monica Mountains of Southern California, there are over 300 non-native species of plants, each the source of its own repercussions and having both positive and negative effects on the environment. One specific non-native species, Carpobrotus edulis (ice plant) replaces the native Coreopsis gigante (giant …
Effects Of Uv Light On Local Stream Frog Behavior, John Buie, Eiichiro Uemura, Candy Hwang, D. Lee, Craig Sutter, Evan Mattiasen, Thomas Vandergon, Rodney Honeycutt, Lee Kats
Effects Of Uv Light On Local Stream Frog Behavior, John Buie, Eiichiro Uemura, Candy Hwang, D. Lee, Craig Sutter, Evan Mattiasen, Thomas Vandergon, Rodney Honeycutt, Lee Kats
Featured Research
Amphibian declines have been well documented throughout the world. Several studies have examined whether UV radiation from the sun is a possible contributing cause to declining populations. In Southern California, two closely related species of treefrogs, Pseudacris hypochondriaca and Pseudacris cadaverina, coexist in many perennial streams. P. hypochondriaca is primarily nocturnal while P. cadaverina is known to bask in direct sunlight. The purpose of the study is to determine how the two different species of frogs will react under different types of light emitted by a portable flashlight. The light was emitting either UV radiation or visible light, or …