Showing papers by "University of Central Florida published in 1979"
TL;DR: The GENRES model was found effective in finding project durations equal to or less than that of ACTIM, ACTRES or TIMRES, and it was found that when the project completion time found by the algorithm approaches the critical path duration, resource leveling may be preferred.
36 citations
TL;DR: A variety of sterilizing agents were tested to develop a standard procedure for surface decontaminating seeds to produce axenic seedlings, with seeds not easily decontaminated, screening of additional seed lots would be more profitable than testing additional decontamination agents.
Abstract: A variety of sterilizing agents were tested to develop a standard procedure for surface decontaminating seeds to produce axenic seedlings. The use of calcium hypochlorite (0.5% phosphate buffer, pH 6) for 10 min followed by three sterile water rinses was among the most effective agents, and it did not injure some species as did sodium hypochlorite, formaldehyde, ethylene oxide and mercuric chloride. Some species contained internal microbes requiring severe treatments which killed or injured the seedling, while other species were "decontaminated" with a sterile water rinse. The percentage of seeds with internal microbes varied considerably among plant species, seed lot, and the length of seed storage. Thus, with seeds not easily decontaminated, screening of additional seed lots would be more profitable than testing additional decontamination agents. Release of microbes from the seed's interior is associated with germination, and microbial testing must last at least 11 days. Nutrient agar permitted growth, although the seedlings outgrew petri plates too quickly for adequate certification. These seedlings were transferred to nutrient agar in quart jars in which an internal pool of broth was periodically agitated to permit microbial sampling of the leaves while the plant grew. IT is generally recognized that microorganisms in the environment can influence a plant's nutrition, physiology, and health. Microbes influence plant nutrition by fixing nitrogen, solubilizing nutrients from rocks (Arrieta and Grez, 1971), aiding root absorption of some minerals, and competing with plants for compounds in the substrate (Barber, 1968). Both pathogens and opportunistic microbes can invade and obscure a susceptible plant's normal physiology while non-pathogens may manufacture plant hormones, metabolize plant exudates, and perhaps induce some disease resistance (Black, 1968; Keen, 1975). Microbes may inhibit the growth of plants under some circumstances (Lindsey and Baker, 1967) and stimulate growth under others (Bolton, Bozarth, and Walkinshaw, 1973). For the study of plant processes which can either be altered by microbes, or of a plant's relationship to its environment, the plants should be free from all other life forms (axenic). Decontamination of plants to produce axenic plants has been accomplished by using four approaches: decontamination of seeds (Lindsey, 1967), aseptic removal of seeds from fruits (White, 1943), aseptic removal of embryos from seeds (Miflin, 1969), and direct decontamination 1 Received for publication 6 October 1978; revision accepted 19 February 1979. We thank Nina Ghering and Jim Koevenig for their assistance with various phases of this project. of organs of mature plants (Baker and Phillips, 1962). Although the first two techniques are usually adopted, there is little agreement as to which sterilizing solution or its dosage is most effective with plant tissues. Evaluations of the efficacy of decontaminating agents by using inert strips covered with fungal spores showed that 5% hypochlorite (the agent most frequently used by botanists) required a 25-min contact time to achieve sterility. Decontamination with 70% ethanol (its most effective concentration) also required 25 min. Although not often used with plants, 5% solutions of formalin or phenol were effective decontaminators after 10and 15-min contact times, respectively (Kruse et al., 1964). Application of either ethylene oxide (850 mg/l) (Ernst and Doyle, 1968) or formaldehyde gas (10.6 mg/l) for 4-6 hr (Sweet, 1971) is effective with surfaces which are hard to wet. The killing effectiveness of many disinfectants may be improved by altering the disinfection procedures. Elevating the temperature to 20 C during disinfection (Segall, 1968) and acidifying to pH 6 (Segall, 1968; Sykes, 1965) greatly improved the effectiveness of hypochlorite. A wetting agent reduced the contact time and the concentration of hypochlorite, formaldehyde and phenol (Kruse et al., 1964), while buffering and sonication improved glutaraldehyde's effectiveness (Sierra and Boucher, 1971). Although numerous procedures for seed decontamination exist in the literature, few publi-
33 citations
TL;DR: In this paper, the distributional characteristics of Kaiser's Measure of Sampling Adequacy (MSA) were investigated in sample matrices generated from multivariate normal populations of specified correlation levels.
Abstract: The distributional characteristics of Kaiser's Measure of Sampling Adequacy (MSA) were investigated in sample matrices generated from multivariate normal populations of specified correlation levels (LC). Systematic variation of sample size (SS) and number of variables (NV) revealed the overall MSA to be most influenced by NV. The implications of these findings for use of the index were discussed.
9 citations
TL;DR: This chapter discusses the general properties of extracellular enzymes and describes features of extracllular enzymes that are common to their synthesis, to their manipulation, in their stability, and to the entire spectrum of the reactions that they catalyze.
Abstract: Publisher Summary This chapter discusses the general properties of extracellular enzymes. It describes rhe features of extracellular enzymes that are common to their synthesis, to their manipulation, in their stability, and to the entire spectrum of the reactions that they catalyze. Future advances in the application of extracellular enzymes and other enzymes are also presented. The extracellular enzymes are, majorly, hydrolases are important in basic studies because they are produced in high concentrations, they are easy to purify, they are easy to assay, they are stable, and they have relatively low molecular weights. Microbially produced extracellular enzymes are of ecological significance. They hydrolyze the macromolecules that are too large to be transported into many types of microbial cells. In contrast to the many labile enzymes, extracellular enzymes survive fairly adverse conditions. Many are able to tolerate high temperatures and survive for relatively long periods of time in soil, the open sea, the sediments of oceans and freshwater lakes, and even in activated sludge.
5 citations
Patent•
30 Aug 1979TL;DR: In this paper, a novel composition of matter having highly effective antibacterial and antifungal activity as well as other desirable pharmacological properties was proposed, which is a mixture of a sulfonamide, an alkylene glycol in which the alkyene moiety contains 5 to 8 carbon atoms.
Abstract: A novel composition of matter having highly effective antibacterial and antifungal activity as well as other desirable pharmacological properties. The composition is a mixture of a sulfonamide (e.g., toluene sulfonamide), an alkylene glycol in which the alkylene moiety contains 5 to 8 carbon atoms (e.g., hexylene glycol or octylene glycol) and an alkylene glycol ester of an alkylene oxide and a dicarboxylic acid (e.g., propylene oxide ester of sebacic acid).
3 citations
13 Sep 1979
TL;DR: In this article, a quantitative description and ecological explanation of the major types of upland vegetation in order to determine the possible future effects of NASA space activities on them was provided, and changes in the relative abundance of small mammal populations, species diversity, standing crop biomass, reproductive activity, and other demographic features were documented.
Abstract: Vegetation and small mammal populations in or around the Merritt Island area were studied. Thirty sites were selected from plant communities which were relatively free of logging, grazing, and clearing operations. The vegetative analysis was designed to yield a quantitative description and ecological explanation of the major types of upland vegetation in order to determine the possible future effects of NASA space activities on them. Changes in the relative abundance of small mammal populations, species diversity, standing crop biomass, reproductive activity, and other demographic features were documented in order to gather sufficient information on these populations so that it would be possible to detect even the smaller nonnatural behavior changes in the mammals which might be attributable to NASA space activities.
3 citations
TL;DR: In this paper, a method was developed enabling analysts to measure the sensitivity of model outcome for a large number of variables, where variables are classified as direct or indirect based on their relationship to the model output.
3 citations
TL;DR: This paper examined and analyzed the results of a 1976 survey of Israeli high school students, focusing on their views on Middle East conflict issues and overall attitudes toward, beliefs about, and perceptions of that conflict.
Abstract: This article examines and analyzes the results of a 1976 survey of Israeli high school students. Special attention is given to their views on Middle East conflict issues and overall attitudes toward, beliefs about, and perceptions of that conflict. A number of relationships are found between respondents' conflict attitudes, beliefs, and perceptions and their socio- economic, contextual, and political characteristics. Several comparisons are drawn with other, related studies and research. Some implications for the present and future direction of the Middle East conflict and peace processes are discussed. Last, a few areas and topics for additional research and analysis are outlined.
2 citations
TL;DR: This national survey found that responses to confidentiality boundaries were determined by role definition, and the extent to which confidentiality was viewed as a necessity depended upon the job that the individual held.
Abstract: This national survey found that responses to confidentiality boundaries were determined by role definition. The extent to which confidentiality was viewed as a necessity depended upon the job that the individual held. Those individuals dealing with the drug abuser from an apprehension and corrections standpoint tended to see confidentiality in a limited sense, feeling that it pertained only to background material and medical records. Those in counseling positions saw confidentiality in much broader terms, in both its scope of protection and importance to the counseling situation.
1 citations
TL;DR: On June 30, 1978, the State of Florida completed a year-long experiment in which television and still camera coverage of trials was allowed as mentioned in this paper, and the State Supreme Court must now decide whether camera c...
Abstract: On June 30, 1978, the State of Florida completed a year‐long experiment in which television and still camera coverage of trials was allowed. The State Supreme Court must now decide whether camera c...
1 citations
06 Nov 1979
TL;DR: A compiling system which implements a rela tional DBMS, which maps a relational user view to an interface defined by basic physical storage constructs for specifying actual data storage structure, and primitive physical navigation operations for implementing data manipulation commands.
Abstract: A compiling system which implements a rela tional DBMS is described. The compiling system is part of a unique architecture designed to simplify DBMS implementation. The architecture specifies an interface defined by basic physical storage constructs for specifying actual data storage structure, and primitive physical navigation operations for implementing data manipulation commands. The compiling system described here maps a relational user view to this interface.
01 Dec 1979
TL;DR: The theory, design, and results of optical fiber pulse dispersion measurements are considered in this article, where both the hardware and software required to perform this type of measurement are described Hardware includes a thermoelectrically cooled injection laser diode source, an 800 GHz gain bandwidth produce avalanche photodiode and an input mode scrambler.
Abstract: The theory, design, and results of optical fiber pulse dispersion measurements are considered Both the hardware and software required to perform this type of measurement are described Hardware includes a thermoelectrically cooled injection laser diode source, an 800 GHz gain bandwidth produce avalanche photodiode and an input mode scrambler Software for a HP 9825 computer includes fast Fourier transform, inverse Fourier transform, and optimal compensation deconvolution Test set construction details are also included Test results include data collected on a 1 Km fiber, a 4 Km fiber, a fused spliced, eight 600 meter length fibers concatenated to form 48 Km, and up to nine optical connectors
TL;DR: In this article, the general implications of noise-induced hearing loss were discussed, including the end organ and non-end organ effects, and the effect of noise on the hearing.
Abstract: (1979). General Implications of Noise-Induced Hearing Loss: End Organ and Non-End Organ Effects. Australian Journal of Human Communication Disorders: Vol. 7, No. 1, pp. 52-57.
14 Nov 1979
TL;DR: In this paper, the authors used daily measurement of day and night infrared and incoming and absorbed solar radiation obtained from a TIROS satellite over a period of approximately 45 months, and integrated over 2.5 degree latitude-longitude grids, the proportion of cloud cover over each grid each day was derived for the entire period.
Abstract: Using daily measurement of day and night infrared and incoming and absorbed solar radiation obtained from a TIROS satellite over a period of approximately 45 months, and integrated over 2.5 degree latitude-longitude grids, the proportion of cloud cover over each grid each day was derived for the entire period. For each of four three-month periods, estimates a and b of the two parameters of the best-fit beta distribution were obtained for each grid location. The (a,b) plane was divided into a number of regions. All the geographical locations whose (a,b) estimates were in the same region in the (a,b) plane were said to have the same cloud cover type for that season. For each season, the world was thus divided into separate cloud cover types. Using estimates of mean cloud cover for each season, the world was again divided into separate cloud cover types. The process was repeated for standard deviations. Thus for each season, three separate cloud cover models were obtained using the criteria of shape of frequency distribution, mean cloud cover, and variability of cloud cover. The cloud cover statistics were derived from once-a-day, near-local-noon satellite radiation measurements.