Electrochemical control of pH in a hydroponic nutrient solution

The electrochemical pH control system described was found to provide a feasible alternative method of controlling nutrient solution pH for CELSS applications. The plants grown in nutrient solution in which the pH was controlled electrochemically showed no adverse effects. Further research into the design of a larger capacity electrode bridge for better control is indicated by the results of this experiment, and is currently under way

Design of an elemental analysis system for CELSS research

The results of experiments conducted with higher plants in tightly sealed growth chambers provide definite evidence that the physical closure of a chamber has significant effects on many aspects of a plant's biology. One of these effects is seen in the change in rates of uptake, distribution, and re-release or nutrient elements by the plant (mass balance). Experimental data indicates that these rates are different from those recorded for plants grown in open field agriculture, or in open growth chambers. Since higher plants are a crucial component of a controlled ecological life support system (CELSS), it is important that the consequences of these rate differences be understood with regard to the growth and yield of the plants. A description of a system for elemental analysis which can be used to monitor the mass balance of nutrient elements in CELSS experiments is given. Additionally, data on the uptake of nutrient elements by higher plants grown in a growth chamber is presented

An Investigation For Viable Seeds In The Surface Soils of Various Sites In A Mixed Prairie Near The Cedar Bluff Reservoir

The purpose of this study was to determine what species of plants emerge from samples of surface soils taken from various sites in a mixed prairie at the Cedar Bluff Reservoir

Madrigal Singers

Kemp Recital Hall Tuesday Evening April 25, 1995 8:00p.m

Concert Choir

Kemp Recital Hall Friday Evening March 27, 1992 8:00p.m

Spelling Rules As An Effective Factor In Seventh And Eighth Grade Spelling Achievement

The problem of this study is to investigate the spelling achievement of seventh and eight grade pupils in both the graded elementary and rural schools of Western Kansas

Madrigal Singers Concert Choir

Kemp Recital Hall Monday Evening April 25, 1994 8:00p.m

Concert Choir Madrigal Singers

Wesley United Methodist Church Bloomington Sunday Afternoon October 31, 1993 3:00p.m

Are you better off than you were before the disaster: Examining how natural disasters impact growth rates

Research on the impact of natural disasters, while young, is starting to take shape as a field of study in political science. Already, a range of studies and methods have been produced, examining the varying effects of different types of disasters on economic growth. This thesis investigates the relationship between disaster frequency and economic growth rates for 127 countries over a thirty year period (1975-2005). This thesis examines if countries with a higher frequency of natural disasters experience a negative change in growth rates. The panel data fixed effects model used in this paper shows that a higher frequency of natural disasters has a statistically significant positive effect on economic growth rates

Assessment of Habitat Quality for Red Snapper, Lutjanus campechanus, in the Northwestern Gulf of Mexico: Natural vs. Artificial Reefs

Habitat quality of natural and artificial reefs for red snapper (Lutjanus campechanus) in the northwestern Gulf of Mexico (Gulf) is important as this area is home to the majority of the Gulf’s artificial reef system, in the form of oil and gas platforms, in addition to the largest extent of high vertical relief natural habitat. This study sought to assess habitat quality of natural reefs of varying habitat complexity and an artificial reef complex located on the LA continental shelf. Habitat quality was assessed by comparing red snapper diets and foraging patterns, and nutritional condition using the liver-somatic index (LSI) and caloric densities. The diets at the natural reefs consisted of primarily fish, while the diets at the artificial reefs consisted of primarily fish and zooplankton. Size class was not an important factor for the diets at the natural reefs, but the diet varied between size classes at the artificial reefs. The natural reefs were found to offer a wider diversity of prey items, and reef-dependent species were found only in the diets at the natural reefs. Differences between diets at the natural and artificial reefs reflected differences between the substrates found at each habitat. Red snapper at the natural reefs were found to feed on and above the reef, while feeding at the artificial reefs was predominantly along the surrounding seafloor and water column. Site-specific temporal patterns in both the LSI and caloric density were evident. The LSI of females at the natural reefs was greater than the LSI of females at the artificial reefs. While caloric density statistically differed between habitats and sizes, the differences between values may not be biologically significant. Female red snapper at the natural reefs appear to be in a better nutritional condition than females at the artificial reefs. Results of this study indicate that natural reefs on the LA continental shelf provide high habitat quality for red snapper. To maximize reproductive output, the better-quality foraging and nutritional condition of red snapper at the natural reefs should be taken into account when evaluating potential areas for the Flower Garden Banks National Marine Sanctuary status