Physical Sciences and Mathematics Commons^™

Breeding In Progress For Seed Retention In Orchardgrass (Dactylis Glomereata L.), M Falcinelli, V Negri, F Veronesi

IGC Proceedings (1977-2023)

As is well known, orchardgrass seeds do not mature and ripen uniformly and early maturing seeds frequently shatter before late developing ones mature. Consequently, in seed crops, high losses can either be due to early'harvesting resulting in an excess of light seeds, or to delayed harvesting resulting in seed shattering. Several agronomic strategies are used by seed producers to minimize seed losses, but the additional costs involved have limited their adoption. Previous papers (Falcinelli et al., 1983 ; 1984) have reported that many populations of D. glomerata from Southern Italy and some populations from Central Italy showed no seed shattering …

Effect Of Frost On Panicle Production In Dactylis Glomerata, O T. Niemelainen

IGC Proceedings (1977-2023)

The average seed yield of cocksfoot in Finland is small. The panicle formation has often been poor although the stand has otherwise been in good condition. In the present study the importance of early summer frost on the failure of panicle for­mation in cocksfoot was studied. The cold tolerance of cocks­foot has been observed to be poor compared to other perennial grasses (Gudleifsson et al., 1986). The sensitivity of cocksfoot to frost during the growing season was observed in the exper­iment of Nikolaevskaya (1973) where a frost treatment at flowering stage of cocksfoot completely destroyed the caryopses. Results of experiments …

A Comparison Of Rhizome And Seed Propagation Of Three Grasses Of Nei Mongol: Chinese Wildrye, Tender Pennisteum And Reedlike Foxtail, Na Sen, Lee Yan Qin, Su Xiao Lin

IGC Proceedings (1977-2023)

China is making great efforts to re-vegetate and improve her rangelands. In Inner Mongolia, improvement and expansion of the rangeland base is necessary to meet the needs of a flourish­ing local livestock industry, and growing demand for livestock products (including draft animals) in China as a whole. But the harsh growing conditions in this cold, dry and windy steppe country make seedling establishment difficult, and propagation with seed is risky at best. Methods of grassland propagation that minimize this risk, reduce the rest period after planting, and result in a more productive range will aid the revegetation effort considerably, and …

The Effect Of Megachilla Rotundata On The Yield And Qualitative Characters Of Alfalfa Seed, B Radenovic, S Starcevic

IGC Proceedings (1977-2023)

The increasing use of insecticides in the Yugoslav agriculture, ploughing of meadows and pastures and the expan­sion of areas under alfalfa grown for seed have resulted in the reduction of useful entomofauna and thus also in the decline of yields of alfalfa seed due to the reduced number of pollinators. This was first indicated upon in the United States, by Knowels, 1943, and in Yugoslavia, it was pointed out by Bosnjak, 1978 and Radenovic and Starcevic, 1982. All these authors agree that there is a positive correlation between the number of Megachillidae, the number of open flowers and embryos. According …

Determination De L’Effet Du Phosphore Et Des Intervallets D’Irrigation Sur La Production De Graines De Trefle Bersim En Iran, A Vaez Zadeh

IGC Proceedings (1977-2023)

La culture du trefle Bersim (Trifolium alexandrinum) devient de plus en plus importante en Iran. Elle est pratiquee dans les rizieres apres la recolte du riz. Aujourd'hui, cette culture s'etend sur 40.000 ha et la production atteint 500.000 tonnes de foin sec, soit un rendement moyen de 12.5 t/ha. Le ministere de !'Agriculture developpe un important programme pour augmenter la superficie jusqu'a 200.000 ha. Ceci correspondra a la moitie de toutes Jes rizieres. La culture du trefle Bersim s'est fortement developpee pen­dant ces dernieres annees en Iran: la superficie a augmente de 578,5 ha en 1982 a 39.500 …

Seed Yield, Fodder Yield And Persistence In White Clover Cvs Of Different Origins. Results Of Trials Conducted At Lodi (Irrigated Po Valley), R Paoletti, C Locattello

IGC Proceedings (1977-2023)

White clover is the most important pasture legume in many EEC countries (white clover-ryegrass pasture system) and a good component of permanent and rotated polyphytic meadows in North Italy (irrigated Po Valley where the Ladino subspecies developed through self selection). The main char­acteristics of the species are N2 fixation and high nutritional value (quality). Therefore, white clover seed usage in the EEC is expected to still be important in the next decades. A number of performing varieties have recently been developed by EEC Research Institutes. An assessment of their seed production potential is necessary in view of self-sufficiency and consequent …

Inoculant Production With Gamma Irradiated Peat And Lyophilized Cultures Of Rhizobium. Survival On Pelleted Seeds And Mineral Oil, M Lopez, R S. Bradley

IGC Proceedings (1977-2023)

In tropical countries one of the ways of improving inoculant distribution consists on seed-pre-inoculation and on the pro­duction of lyophilized inoculants allowing a higher viability during the storage period. Thus, it is necessary to learn the rhizobium survival in pre-inoculated seeds and in lyophilized flasks, as well as in mineral oil used as a rhizobium carrier.

Les Inineraires Techniques Pour La Production De Semences De Trefle Blanc En France, J Aletru, Y Bouchet

IGC Proceedings (1977-2023)

Le Trefle blanc est une legumineuse fourragere ayant une morphologie et une physiologie tout a fait originales par rapport aux autres especes fourrageres que nous avons l'habitude de travailler : luzerne, trefle violet, sainfoin, etc. Le Trefle blanc a un port rampant, l'essentiel de la croissance s'effectue horizontalement, Jes parties aeriennes sont consti­tuees de petioles, de feuilles en phase vegetative, auxquelles s'ajoutent des pedoncules et des inflorescences en phase repro­ductrice. Le stolon, « colonne vertebrale » des parties aeriennes, est l'organe de reserve ayant une importance preponderante. II colonise le sol en emettant de 70 a 110 metres de stolons …

Environmental Considerations For Lotus Production: Seed Versus Herbage, P R. Beuselinck, R L. Mcgraw

IGC Proceedings (1977-2023)

Broadleafed birdsfoot trefoil (Lotus corniculatus L.), is recognized for good productivity on marginal soils (Seaney and Henson, 1970), high feeding value (Marten and Ehle, 1984), stock-piling efficiency (Collins, 1982) and freedom from bloat­inducement in ruminants (Marten and Jordan, 1979) makes it a worthy herbage crop for many areas and grazing situations. The most productive USA areas are New England, the West Coast, the North Central Plains, and some isolated areas of higher elevations in the South (Grant and Marten, 1985). Difficulty in harvesting sufficient quantities of seed is a major factor limiting the use and production of birdsfoot trefoil in …

Agricultural Behaviour Of Lablab Purpureus Cv. Rongai Under Cuban Conditions, V A. Remy, C Matias, A Perez, M Beavogui

IGC Proceedings (1977-2023)

Production strategy of livestock in Cuba is based upon the utilization of swards as the main feeding source. Nevertheless, the climatical conditions that exist in certain period of the year lead to a seasonal productive unbalance due to the decreasing sequence of rainfall. Several alternatives have been adopted against this situation and one of them is the utilization of tem­porary cultivars. Taking into consideration the previous situation, the possi­bility of spreading Lablab purpureus, the suitable growth that it presents under temperatures among 18-30 °C (Duke, 1983), rainfall among 200-2500 mm (National Academy of Science, 1979) and its seed production from …

Influence Of The Manner Of Sowing And Vegetation Cycle On The Yield And Seed Quality Of Birdfoot Trefoil (Lotus Corniculatus), D Gataric, S Alibegovic-Grbic

IGC Proceedings (1977-2023)

In ecological conditions of Yugoslavia, birdsfoot trefoil, with its positive features, presents a very significant fodder crop, especially for the hill and mountain regions. However, due to poor seed production technology, there is a shortage of seed for more intensive production. Seed is usually produced on areas intended for the production of fodder, hand sown with large quantities of seed (25-35 kg/ha). The study was undertaken. with the following targets : I/determining the influence of the manner of sowing and veg­etation cycle on the yield and the quality of seed ; 2/ determin­ing the optimum sowing manner and vegetation cycle …

Nouvelles Possibilites De Lutte Contre Les Ravageurs De La Luzerne Porte-Graine En France, J Hacquet

IGC Proceedings (1977-2023)

La mai'trise des insectes ravageurs dans la luzerne porte­graine est une necessite pour l'obtention de rendements eleves et reguliers. La collaboration etroite entre le Service Technique de la FNAMS et la Laboratoire de Zoologie de l'INRA de Lusignan a permis d'inventorier les differents ravageurs, de mettre au point une panoplie de traitements et de faire connai'­tre les moyens de lutte aupres de tous Jes praticiens de cette cul­ture (FNAMS-INRA, 1980 et 1986). De plus des reseaux d'Avertissements Agricoles ont ete mis en place et suivis par le Service de la Protection des Vegetaux, avec la participation des professionnels (Perron, 1987). …

Variation Of Seed Yield And Its Components In Common Vetch (Vicia Sativa L.) Under Different Conditions, E Acikgoz, I Turgut, H Ekiz

IGC Proceedings (1977-2023)

Common vetch (Vicia sativa L.) is widely used as a seed or hay crop in Turkey. In humid coastal areas it is principally used fot hay or green herbage while in dry regions it is used mostly for seed. Roughly ground vetch seed is a popular concentrated feed and mixed with straw or cereal grain (A9ikg6z, 1988). Approximately 200.000 ha of common vetch are seeded every year in Turkey. It is sown mostly as a spring-seeded crop and is often subjected to severe heat and drought stress as the season progress. Yields are generally low with an average seed …

White Clover Seed Production In Two Mediterranean Environments Of Tuscany And Sardinia, P Bullitta, Simonetta Bullitta, A Pardini, S Piemontese, P P. Roggero, P Talamucci

IGC Proceedings (1977-2023)

Purpose of the trialwas the identification of the most suitable varieties for white clover Trifolium repens L. seed production in Mediterranean environments. The main reason of this paper is to verify whether it is possible to produce seed of European varieties of white clover in south Europe considering that surfaces for seed production are decreasing in the northern European countries that were normally producers of white clo­ver seed. The production of clover seed in southern Europe could advantageously replace the import from New Zealand and California.

Vegetative Propagation Of White Clover An Application In White Clover Seed Production, P C.D Newton, A I. Popay

IGC Proceedings (1977-2023)

Establishment of white clover for agricultural purposes is invariably by seed. However, natural regeneration is almost entirely vegetative (Chapman, 1987), and flowering may be restricted to a small proportion of individuals within a popu­lation (Burdon, 1980) When white clover is present in the soil seedbank, there is potential for both intra- (between classes) and inter-varietal contamination of seed crops. Lancashire et al., (1985) have commented that genetic contamination of white clover seed is a world-wide problem. Volunteer seedlings may be removed from between the crop rows mechanically, but there remains an untreatable area close to the crop which is available …

Viability Of Stylosanthes Seeds As Affected By Storage Duration, J B. Brolmann, B J. Boman

IGC Proceedings (1977-2023)

Tropical legumes such as members of the genus Stylosanthes (sty lo) contribute to the improvement of pastures in the tropics and sub-tropics. Stylosanthes is usually established from seed. In Florida, seed of Stylosanthes has to be produced and col­lected before the onset of the winter since occasional frosts can damage seed-bearing vegetation. Therefore, early maturing Stylosanthes varieties have been developed. In stylo seed collections maintained for breeding or seed exchange purposes, maintenances of seed viability is critical. New pests or new diseases may require a renewed screening of stored accessions. It is important, then, that the seed source of this …

Modification Of Stolon Growth, Development And Flowering By Plant Growth Regulators In White Clover (Trifolium Repens L.) Seed Crops, A H. Marshall, D H. Hides

IGC Proceedings (1977-2023)

Within the EEC the need to develop low cost less intensive systems of animal production has led to an increase in the importance of legumes generally, and white clover in particu­lar. At present, annual white clover seed usage within the EEC is approximately 4,000 tonnes, however, the self sufficiency rate is expected to fall below 50 % by the end of the 1980s due prin­cipally to unpredictable seed yields which make it an unprofit­able crop for seed growers. The main component of seed yield in white clover is the number of ripe inflorescences at harvest (Zaleski, 1961) however, the proportion …

Growth Regulator Effects On Seed Production Of Lotus Corniculatus L. And Lotus Uliginosus Schkuhr., J G. Hampton, Qingfeng Li, M D. Hare

IGC Proceedings (1977-2023)

Seed yield in both Lotus corniculatus L. and Lotus uliginosus Schkuhr. (syn. L. pedunculatus Cav.) is considered to be limited by the indeterminate growth habit which results in a protracted (2-4 month) flowering period (Witchwoot, 1987; Li and Hill, 1988) leading to wide variation in seed maturity and seed loss through pod shattering. In both species seed yield is determined primarily by the number of inflorescences (Mos, 1983 ; Wit­chwoot, 1987), and thus treatments which alter or remove api­cal dominance, enhance shoot production or main stem bran­ching thereby increasing inflorescence numbers (Clifford et al., 1983 ; Li and Hill, 1988), …

Plant Resources And Forage Seed Production In China, Dong Peihua

IGC Proceedings (1977-2023)

China is situated in the Eastern part of Asia ; from North to South it extends across the temperate and tropical zones. From East to West it has humid, semiarid, arid regions. There is no frost through the year in some part ofHainan Island, Yunnan, Guangdong and Taiwan provinces. Therefore plants grow the year round and there is a wide range of tropical species. The geographical and climatical differences resulted in rich grass resources. There are three hundred million hectares of natural pastures in Northern China, with more than 4000 plant species. These plants have different degrees of feeding value. …

Ai Beliefs And Practices In Community College Classrooms, Julie Eng, Heather Umphlett, Jocelyn Gilchrist, Alicia Howell, Mary Ann Howell, Wendy Miller-Edwards, Laurel Pope

Inquiry: The Journal of the Virginia Community Colleges

The country, the Commonwealth of Virginia, and Virginia Community College System initiatives all promote generative AI within education. It is a topic of great concern and interest for higher education instructors, yet at the same time many faculty members feel uncertain about effectively integrating it into class material. To further add pressure to the AI explosion, community colleges particularly face a responsibility to prepare their students for success in this new AI-focused environment. In this article, seven faculty members from Camp Community College discuss the implications of generative AI programs, including subscriptions and chatbots, within their particular courses and how …

Ai Isn’T What We Should Be Worried About – It’S The Humans Controlling It, Billy J. Stratton

English and Literary Arts: Faculty Scholarship

Stratton examines depictions of AI in popular media and literature, drawing comparisons to real-world AI and humanity's capacity to harness technology for good or ill.

Discovery Of Suitable Habitat For Freshwater Mussel Species In The Appomattox River Through The Use Of Environmental Dna., Nicholas Duellman

Longwood Senior Thesis Proposal

Freshwater mussels are a keystone species providing crucial ecosystem services and river composition resiliency. Anecdotal evidence suggests the presence of freshwater mussels within the Appomattox river, the specifics of population sizes and suitable habitat remains an open question. Environmental DNA (eDNA) usage in conservation ecology has exploded in use within the past two decades, being far less invasive and cost-demanding than traditional methods. An eDNA metabarcoding pipeline of the 16s mitochondrial ribosomal subunit was built in R v. 4.4.2, using dada2 v. 3.2.1 package to trim MinION single read ASV outputs for freshwater mussel species identification in the interest of …

04.07.2025 Ored Connect, Liz Williamson

ORED Newsletter

New ORED Website Goes Live

Oxford Pitch Competition

Hughes Miller, Strategic Partnerships

Evaluating Wrist Placement And Signal Processing Techniques For Real-World Hrv Monitoring Using Ppg, Andrew Murphy

College of Computing and Digital Media Dissertations

This thesis investigates trade-offs between signal quality and data coverage in photoplethysmographic (PPG) heart rate variability (HRV) monitoring using wrist-worn devices. The goal was to evaluate whether wrist placement and signal processing techniques can improve measurement reliability in real-world conditions. Data was collected from healthy participants wearing smartwatches on both wrists during rest and a structured math task introducing natural wrist movement. Three distinct processing methodologies were compared, including a proposed Rolling-Standardized Derivative (RSD) approach. Results showed that while HRV signals from both wrists were highly correlated at rest, motion caused a measurable drop in signal quality and inter-wrist agreement, …

Living With Alzheimer’S: A Guide To How To Lower The Risk Of Memory Loss & Care For Those With Alzheimer’S, Mona Muzammil, Washain Muzammil

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Chemistry)

Despite the frequent characterization of Alzheimer's disease as a “loss of self,"" this enlightening book demonstrates unequivocally that a person's unique self persists throughout the course of the disease. The important message in Caring for People with Alzheimer’s is how much can be done in care settings to support a person's sense of identity and thereby enrich the lives of people experiencing the many losses associated with dementia. Drawing from a diverse body of research, this book brings together the recommendations of the best thinkers and practitioners in multiple disciplines to illustrate the meaning of self and the importance of …

Evaluating The Performance Of Bayesian Removal Models For Estimating Population Density And Detecting Trends With Variable Detection Probability, David R. Stewart

Mathematics & Statistics ETDs

Removal models have long been used to estimate population abundance by progressively capturing and removing individuals from a closed population. These models provide a valuable tool for ecological monitoring, but their accuracy depends heavily on assumptions about detection probability, which may decline over successive sampling passes. Traditional removal models assume constant detection probabilities, an assumption that is often violated in real-world applications. This thesis aims to advance hierarchical Bayesian models by accounting for variable detection probabilities, improving the reliability of abundance estimates and trend detection. By integrating simulation-based analyses with empirical data from Lahontan Cutthroat Trout (Oncorhynchus clarkia henshawi …

Predicting PkA Of Flexible Polybasic Tetra-Aza Macrocycles, Tatum K. Harvey, Kristof Pota, Magy Mekhail, David M. Freire, Donatus A. Agbaglo, Benjamin G. Janesko, Kayla N. Green

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

We present physics-based pK_a predictions for a library of tetra-aza macrocycles. These flexible, polybasic molecules exhibit highly charged states and substantial prototropic tautomerism, presenting a challenge for pK_a prediction. Our computational protocol combines CREST/xTB conformational sampling, density functional theory (DFT) refinement in continuum solvent, and a linear empirical correction (LEC). This approach predicts known tetra-aza macrocycle pK_a to within a root-mean-square deviation 1.2 log units. This approach also provides reasonable predictions for the most stable protomers at different pH. We use this protocol to predict pK_a values for four novel, synthetically achievable, …

How It Will End: Physical And Philosophical Implications Of The Fate Of Our Universe, Alex Bittle '26

Honor Scholar Theses

What does physics have to say about the end of our universe? And what does it mean for us, if anything? Answering these questions requires an understanding of the so-called "lambda-cold dark matter" (ΛCDM) model of cosmology, which models the universe as containing an expanding pressure, Λ or dark energy, in a battle with the gravitational attraction provided by dark and regular matter. First, the physics (including observations and theory) of the ΛCDM, including the Big Bang and CMB, the inflationary period, and equations that govern the way the size of the universe changes with respect to time for different …

Tiny Creatures, Big Lessons: Using Music Education And Ecoliteracy To Impact Young Learners' Perspectives On Bugs And Nature, Paige Burgess '25

Honor Scholar Theses

This thesis aims to demonstrate that relationships between students and nature can be improved through teaching young learners about music and bugs together, potentially leading to a greater overall love for and willingness to protect nature. The thesis features original teacher action research conducted over multiple weeks in a first grade classroom, with observations and data to support the efficacy of the methods discussed. This thesis analyzes literature that supports how increasing empathy toward bugs at a young age can have tangible benefits for the environment, how ecoliteracy as a framework is an effective means of teaching about nature, and …

Simplifying 3d Printing Using Natural Language Processing, Jared E. Rosenberger

Undergraduate Theses

3D printing is a crucial technology with many applications in different fields. To be able to use this technology to its full extent, expertise in computer aided design (CAD) technology and 3D modeling is required. Many people interested in 3D printing do not have this expertise and thus cannot build custom models, and are consequently forced to buy them instead. Natural language processing (NLP) is one tool that can vastly simplify 3D modeling for those lacking CAD experience. Using NLP, someone can simply dictate what they want to be able to print, and a computer can then build a 3D …