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Full-Text Articles in Life Sciences

Diagnosis Of Livestock Production In Three Communities (La Inmaculada, Tunshi San Miguel, And Ela Guano) Using The Chambo Irrigation System - Guano, Egresado José Orozco Cruz Jan 1997

Diagnosis Of Livestock Production In Three Communities (La Inmaculada, Tunshi San Miguel, And Ela Guano) Using The Chambo Irrigation System - Guano, Egresado José Orozco Cruz

Theses and Dissertations

The purpose of this research was to implement a stratifying sampling system in the communities of La Inmaculada, Tunshi San Miguel, and Ela Guano, part of the Chambo-Guano irrigation system. The domesticated animal population in these communities consisted of cattle, sheep, swine, guinea pigs, and poultry. The animal feed used in these communities included alfalfa, grass, corn stalks, banana, weeds, kitchen residue, hulk, hard and soft corn, barley, wheat and other feed preparations. In general, animal management in these communities is technically deficient and most animals exhibited diseases that are controllable by veterinarians. Study recommendations to improve conditions for rural …

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Vitamin A Content In Preparations Of Plant Foods With The Highest Consumption In The Beneficiary Communities Of The Benson Institute, Ana Luisa Méndez Hernández Jan 1997

Vitamin A Content In Preparations Of Plant Foods With The Highest Consumption In The Beneficiary Communities Of The Benson Institute, Ana Luisa Méndez Hernández

Theses and Dissertations

One of the main nutrient deficiencies in Guatemala is vitamin A, mainly in pregnant women and children under the age of five. The consumption of plant material can improve vitamin A ingestion levels. It is necessary to research consumption frequency and preparation methods of the most commonly available plant materials, as well as the vitamin A content of these plant materials. This research took place in San Juan Ermita, Chiquimula in the communities of Chancó, Corral de Piedra, and Salitrón. The results demonstrated that the most commonly consumed plant material preparations were mulberry soup, chatate soup, toasted maize soup, chipilin …

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Study Of Livestock Production Levels In Three Communities Near The City Of Riobamba, Raul Rolando Nuñez Lopez Jan 1997

Study Of Livestock Production Levels In Three Communities Near The City Of Riobamba, Raul Rolando Nuñez Lopez

Theses and Dissertations

This study was done by administering household surveys to 50% of the families in the three communities. Families were selected through stratified random sampling. This allowed us to determine how much families are exploiting species that have a significant level of production as well as whether they use them for a commercial activity or subsistence. With regard to cows, 60.40 ± 4.72% of families use them. Each family has an average of 1.68 ± 0.21 cows. Productive cows make up 36.9% of the above percentage, which is a majority. The measured rate of production was 6.48 ± 0.25 L/cow/day. Overall, …

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Nutritional And Food Situation Of Five Communities Of Canaviri, Colina Blanca, Villa Arriendo, Puente Arriba And Pocohata, Department Of La Paz, Bolivia, Juana F. Moraima Gonzáles Tapia Jan 1997

Nutritional And Food Situation Of Five Communities Of Canaviri, Colina Blanca, Villa Arriendo, Puente Arriba And Pocohata, Department Of La Paz, Bolivia, Juana F. Moraima Gonzáles Tapia

Theses and Dissertations

The following work seeks to address the necessity that the inhabitants of the impoverished regions in Bolivia experience, as is the case of the highland region of Paceno, which is the understanding of their nutritional and alimentary situation. We studied the communities of Canavari, Pocohata, Colina Blanca, Puente Arriba, and Villa Arriendo de la Provincia Ingavi, in the province of la Paz.
The studied variable was the nutritional sta te, having as parameters: physical and economical availability of the food, food consumption, nutritional habits, biological usage of the food, basic sanitary conditions, and the educationallevel of the heads of family. …

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Nutritional Situation Of The Communities Pan De Azucar, Hancara, Villa Santa Chacoma And Hichuraya Grande, Department Of La Paz, Ingavi Province, Bolivia 1996, Teresa Beatriz Iglesias Sandoval Jan 1997

Nutritional Situation Of The Communities Pan De Azucar, Hancara, Villa Santa Chacoma And Hichuraya Grande, Department Of La Paz, Ingavi Province, Bolivia 1996, Teresa Beatriz Iglesias Sandoval

Theses and Dissertations

The present research work is a transverse and descriptive study, which had as its principal objective to determine the Food and Nutritional Situation of the communities of Villa Santa Chacoma, Hancara, Hichuraya Grande and Pan de Azucar of the Ingavi province of the department of the La Paz. The most relevant part of the study was in finding the elevated percentage of infant population that presents an elevated prevalence and different levels of malnutrition. In adults what calls the attention is the physical exhaustion and the loss of muscle tissue, this situation was seen as a consequence of poverty, food …

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Food And Nutrition Situation In The Villa Santa Chacoma, Hancara, Hichuraya Grande And Pan De Azucar Communities Of The Ingavi Province In The Department Of La Paz, Bolivia 1996, Teresa Beatriz Iglesias Sandoval Jan 1997

Food And Nutrition Situation In The Villa Santa Chacoma, Hancara, Hichuraya Grande And Pan De Azucar Communities Of The Ingavi Province In The Department Of La Paz, Bolivia 1996, Teresa Beatriz Iglesias Sandoval

Theses and Dissertations

A diagnosis of the Food and Nutrition situation was made of the populations of the communities of Villa Santa Chacoma, Hancara, Hichuraya Grande and Pan de Azúcar, pertaining to the Ingavi province of the La Paz department. The principle objective was to: identify the Nutritional Food Situation of these communities, the secondary objectives were to: Identify the nutritional state of the inhabitants of the communities, identify the physical availability of food, identify the habits of breastfeeding and supplementary feeding, identify the level of ingestion, establish the consumption of food and identify the level of education of householders; to these ends …

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Tests On The Elaboration Of Soybean Milk, Derivatives, And Industrial Feasibility Project, Ciro Pablo Kopp Valdivia Jan 1997

Tests On The Elaboration Of Soybean Milk, Derivatives, And Industrial Feasibility Project, Ciro Pablo Kopp Valdivia

Theses and Dissertations

This work was done with the purpose of evaluating different forms of soybean milk processing, the product acceptance by the public, and to do a study on the feasibility for the production of milk at a small scale to be used as a nutritional supplement in school breakfasts. The soybean milk was prepared with 2 varieties "(Cristalina and Doko)" and two periods of enzymatic inactivation (Before and After) of the grain mush. The "organoleptic" quality was evaluated through surveys and its posterior statistical analysis. Parameter quality was also considered just as did the microbiologic analysis and the conservation tests. The …

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Electrophysiological Effects Of Lysoplasmenylcholine On Rabbit Ventricular Myocytes, Ray Caldwell Jan 1997

Electrophysiological Effects Of Lysoplasmenylcholine On Rabbit Ventricular Myocytes, Ray Caldwell

Theses and Dissertations

Myocardial ischemia activates a phospholipase A2 that targets plasmalogen phospholipids and liberates 1-0-alkenyl-Iysoplasmenylcholine (LPLC) in preference to 1-0- acyl-Iysophosphatidylcholine (LPC). Although LPC is a pro arrhythmic ischemic metabolite, the effect of LPLC on cardiac electrophysiology is unknown. At the lowest doses investigated, LPLC induced spontaneous contractions in otherwise quiescent rabbit ventricular myocytes significantly faster than LPC. Spontaneous contractions developed with median times of 16.4 (n = 64), 27.4 (n = 36), and >60 min (n = 25) during exposure to 5, 2.5, and 1 JlM LPLC compared with 38.0 (n = 48) and >60 min (n = 29) for 5 …

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Stem Cell Factor And Kit Expression In Type I Neurofibromatosis, Kenneth Eugene Roth Jan 1997

Stem Cell Factor And Kit Expression In Type I Neurofibromatosis, Kenneth Eugene Roth

Theses and Dissertations

Neurofibromatosis type 1 (NF1) is an inherited disease characterized by the appearance of multiple neurofibromas and an increased incidence of malignant schwannomas, both of which contain hyperproliferative Schwann cells. Our laboratory previously reported that Schwann cells produce stem cell factor (SCF), a multi potential growth factor known to be involved in mast cell migration and growth. Given the fact that mast cell numbers are increased in both neurofibromas and malignant schwannomas, we set out to evaluate a potential role for SCF in the development of NF1 lesions. First we studied the effects of high doses of recombinant SCF on mast …

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Estimation Of The Ld100p When P Is Small, Daniel Bettendorf Jan 1997

Estimation Of The Ld100p When P Is Small, Daniel Bettendorf

Theses and Dissertations

This thesis concerns the estimation of extreme quantiles on a dose-response curve. It focuses on the Robbins-Monro and up-and-down procedures. Simulation studies run in search of the LD15 and LD30 using a variety of methods suggest that the Robbins-Monro procedure is optimal in terms of Monte Carlo MSE and bias. The up-and-down procedure's performance differs in many cases only slightly from that of the Robbins-Monro process, therefore indicating its value as a practical alternative to the Robbins-Monro process for extreme-quantile estimation.

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Molecular Cloning And Analysis Of The Promoter For Rat Hepatic Neutral Cholesterol Ester Hydrolase, Ramesh Natarajan Jan 1997

Molecular Cloning And Analysis Of The Promoter For Rat Hepatic Neutral Cholesterol Ester Hydrolase, Ramesh Natarajan

Theses and Dissertations

Neutral cholesterol ester hydrolase (CEH) is a key enzyme in regulating hepatic free cholesterol. Using the CEH specific cDNA sequence in the 5'-untranslated region as a primer, 1.3 kb of sequence upstream of the ATG initiation codon was amplified and cloned. Primer extension analysis with total RNA from rat primary hepatocytes identified a transcription initiation site, 60 bases upstream from the initiation codon. No typical TATA-box sequences were found upstream from the transcription start site. However, a consensus GC-box, which can bind the positive transcription factor SP1, was found 35 bases upstream from the transcription start site. In addition the …

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The Nutritional Characterization Of The Carob Tree In The Department Of Cochabamba, Karem Khaterine Loma Mercado Jan 1997

The Nutritional Characterization Of The Carob Tree In The Department Of Cochabamba, Karem Khaterine Loma Mercado

Theses and Dissertations

The nutritional value for the following species have been determined: P.pallida, P.laevigata var. andicola, P.flexuosa, P.nigra, P.alba of the genus Proposis. To obtain this purpose surveys were done about the use and consumption of the Carob Tree in the High and Central Valleys of the Cochabamba Department. As a result of the surveys it was determined that the consumption of the pods made up for 54% of human nourishment. The species that were consumed the most were P.pallida and P.laevigata var. andicola. Within the uses of these leguminous pods, the pods are directly consumed in their raw form and on …

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Determination Of Toxicity And Bioactivity Of Four Organic Insecticides Recommended For Control Of Pests In Vegetable Crops, Hugo Humberto Rodriguez Salvatierra Jan 1996

Determination Of Toxicity And Bioactivity Of Four Organic Insecticides Recommended For Control Of Pests In Vegetable Crops, Hugo Humberto Rodriguez Salvatierra

Theses and Dissertations

This work was done to determine the toxicity and bioactivity of four organic insecticides and ultimately find answers about their toxic potential. Thus, farmers will be able to take the necessary precautions when using them. This investigation was performed in the Laboratory of Biology of the Eastern University Center (Chiquimula) at the University of San Carlos, Guatemala. In order to determine the acute toxicity and bioactivity of the organic insecticides ANONAZO, BOX, AJORIN, and NARCISO, five doses were used in albino mice and three concentrations in nauplii of brine shrimp (Artemia salina). The finney basic program was used for calculating …

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Red Blood Cell Stability In Uremic Rats, Cecilia Mermel Maccallum Jan 1996

Red Blood Cell Stability In Uremic Rats, Cecilia Mermel Maccallum

Theses and Dissertations

Determining the fragility of the red blood cell (RBC) is important for the diagnosis of and evaluation for treatment of several RBC diseases. In part RBC production is controlled through the hormone erythropoietin secreted by the kidney. In a previous study from this laboratory, it was found that RBC were more stable in uremic male rats compared to controls. In this experiment, uremia was induced in four groups of female rats through a two stage nephrectomy. The nephrectomy involved the removal of two-thirds of the left kidney, followed by the removal of the entire right kidney one week later. The …

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Nutritional And Alimentative State Of The Canaviri, Pocohata, Colina Blanca, Puente Arriba And Villa Arriendo, Ingavi Province, Department Of La Paz - 1996, Juana F. Moraima Gonzles Tapia Jan 1996

Nutritional And Alimentative State Of The Canaviri, Pocohata, Colina Blanca, Puente Arriba And Villa Arriendo, Ingavi Province, Department Of La Paz - 1996, Juana F. Moraima Gonzles Tapia

Theses and Dissertations

The intent of the present work responds to the necessity of the settlers in depressed areas of La Paz's Altiplano in Bolivia of knowing the reality surrounding the unfolding of their lives. The focus takes into account only one part of all that weighs down on them: that part dealing with their nutritional and alimentative state. This study takes in the communities of Canaviri, Pocohata, Colina Blanca, Puente Arriba, and Villa Arriendo of the Ingavi Province in the Department of La Paz. The variable taken into account is the families' nutritional situation; these families possessing the same status in the …

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Effects Of Ammonium Perchlorate On The Thyroid Hormone Levels Of The Sprague-Dawley Rat, James H. King Jr. Dec 1995

Effects Of Ammonium Perchlorate On The Thyroid Hormone Levels Of The Sprague-Dawley Rat, James H. King Jr.

Theses and Dissertations

The purpose of this research was to determine the threshold dose for ammonium perchlorate (AP) in the Sprague-Dawley rat. No dose response data exist for AP and the EPA has studied literature on the subject of perchlorates to determine a provisional reference dose. The Perchiorate Group, a consortium of DoD and industry representatives, believes this provisional reference dose is too conservative. This experiment was executed to provide dose response data on which to base a more accurate reference dose. The study consisted of eight groups of 12 Sprague-Dawley rats, six male and six female, which were exposed to incremental doses …

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Bioremediation: Factors Influencing Metal Ion Toxicity In A Toluene Selected Bacterial Population, Scott D. Hansen Dec 1995

Bioremediation: Factors Influencing Metal Ion Toxicity In A Toluene Selected Bacterial Population, Scott D. Hansen

Theses and Dissertations

This research was a general phenomenalistic overview of the effects of metals on the respiration rates of a toluene selected microbe culture. The metals studied were copper, zinc, cobalt, manganese and iron. Relative inhibition, Cu>Fe>Zn=Co>Mn, corresponded to hydrogen phosphate binding strengths. Inhibition was found to be pH dependent; it increased with increasing pH and was shown to correlate to an increased adsorption of metal onto the cell. Zn, Cu, and Co toxicities were shown to decrease with increasing magnesium concentrations. This decrease was linked to increased magnesium adsorption and decreased metal adsorption. The magnitude of effect was …

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Determining Types Of Health Effects To Persian Gulf Veterans Due To Exposure To Occupational Hazards, Rebecca A. Nelson Dec 1995

Determining Types Of Health Effects To Persian Gulf Veterans Due To Exposure To Occupational Hazards, Rebecca A. Nelson

Theses and Dissertations

Persian Gulf Veterans' Illnesses (PGVI) consists of multiple illnesses with overlapping symptoms and causes. This research examined health effects literature concerning several occupational chemicals, to identify significant adverse health trends and assess research quality, completeness, and relevance. After compiling this knowledge base, the research focus was narrowed to Chronic Fatigue Syndrome (CFS), solvents, and pyridostigmine bromide (PB). The existing data was analyzed and compared to PGVI health data using the nonparametric statistical method of contingency table analysis to prove or disprove a link between the substance and PGVI. The results of the contingency table analysis were used to make inferences …

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An Analysis Of 1994 Air Force Toxic Release Inventory Reporting, Brian A. Pollock Dec 1995

An Analysis Of 1994 Air Force Toxic Release Inventory Reporting, Brian A. Pollock

Theses and Dissertations

The purpose of this research is to analyze the Air Force's 1994 Toxic Release Inventory data. Statistical tests were used to meet the following research objectives: (1) review the CY 94 data to determine which chemicals were most often reported and which bases and major commands had the most releases in terms of the number of chemicals reported and the amount of chemicals reported and (2) investigate factors which could influence the reporting status of a facility. An analysis of the TRI data showed that dichloromethane was the chemical released in the largest amount while methyl ethyl ketone was the …

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Modified Model For Transient Response Of Mrna Synthesis To Magnetic Field Exposure, Timothy W. Crosnoe Dec 1995

Modified Model For Transient Response Of Mrna Synthesis To Magnetic Field Exposure, Timothy W. Crosnoe

Theses and Dissertations

It is a well-known fact that high frequency, or radio frequency, radiation can be directly harmful to biological tissue. The radiation frequencies to which humans are most exposed, however, are the extremely low frequencies, or ELFs. To date there has been no definitive measure for predicting the ability of low frequency electromagnetic radiation to cause adverse biological effects. Two specific measures, average magnetic field and kinetic index, have been used in studies to determine if they are useful predictors of adverse effects, specifically leukemia. Unfortunately, both have shown only marginal results. This thesis analyzed and improved the kinetic index measure …

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Chlorophyll Biosynthesis In Kleptoplastid Symbioses, Robert Joseph Swatski Dec 1995

Chlorophyll Biosynthesis In Kleptoplastid Symbioses, Robert Joseph Swatski

Theses and Dissertations

The retention by ascoglossan sea slugs of photosynthetically functional algal chloroplasts (kleptoplastids) has been the subject of intense study over the past three decades. The question of whether kleptoplastids are capable of de novo chlorophyll biosynthesis was seemingly answered by Trench and Smith (1970) and Trench et al. (1973), who found no 14C uptake into chlorophylls in the ascoglossans, Elvsia viridis and E. crispata, after brief radioisotope incubations. However, Clark and Waugh (unpub.) demonstrated some 14C uptake into chlorophyll in CQStasiqlla ocellifera, a long-term kleptoplasad retainer, which promoted a re-analysis of these experiments. In order to prove the occurrence of …

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Physiologically-Based Pharmacokinetic Modeling Of Skin Absorption Using Dermal Subcompartments, Richard L. Bookout Jr. Jun 1995

Physiologically-Based Pharmacokinetic Modeling Of Skin Absorption Using Dermal Subcompartments, Richard L. Bookout Jr.

Theses and Dissertations

Dermal penetration of chemicals and drugs is important to both toxicologists and pharmacologists. Drug developers try to enhance and environmental professionals try to limit penetration of chemicals through the skin. Both can use predictive biologically-based mathematical models to assist in understanding the processes involved. When these models are based on physiological and biochemical parameters which can be measured in the laboratory, they can be extremely useful. Appropriately validated models based on first principles can be predictive of human exposures when the processes involved are adequately understood. In this thesis we develop four new physiologically-based pharmacokinetic (PBPK) models to predict blood …

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General Diagnosis Of Salitrón, A Village In San Juan Ermita, Department Of Chiquimula, Fredy Samuel Coronado López Jan 1995

General Diagnosis Of Salitrón, A Village In San Juan Ermita, Department Of Chiquimula, Fredy Samuel Coronado López

Theses and Dissertations

This study reports on the development of a diagnostic tool to assess the current socio-economic and cultural conditions as well as physical and natural resources among the rural communities of Salitrón and San Juan Ermita, Chiquimula, Guatemala. This diagnostic tool revealed the current situation in these communities, especially in the population dedicated to agricultural production. Several alternative recommendations are provided to improve development projects in these communities. This project was made possible through the participation of CUNORI (Centro Universitario de Oriente) agricultural students.

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Study Of The Time Efficiency And Volume Of Wood Used For Three Types Of Stove In The Salitrón Community Of San Juan Ermita, Department Of Chiquimula, Fredy Samuel Coronado López Jan 1995

Study Of The Time Efficiency And Volume Of Wood Used For Three Types Of Stove In The Salitrón Community Of San Juan Ermita, Department Of Chiquimula, Fredy Samuel Coronado López

Theses and Dissertations

In developing countries such as Guatemala, firewood is increasingly being used for cooking in most rural areas. Consequently, there is a shortage of firewood in these areas beca use trees do not grow at the same rate as they are consumed. Some authors report that 90% of the heat from firewood is lost during combustion. Several alternatives to open pit fires exist to reduce the amount of firewood used. However, these alternatives need to be evaluated to determine their efficiency. This project compared the time efficiency and volume of firewood used in the Finlandia style improved stoves, Josefina stoves, and …

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Statistical Methods For Detecting And Characterizing Departures From Additivity In Multi-Dimensional Drug/Chemical Mixtures, Kathryn S. Dawson Jan 1995

Statistical Methods For Detecting And Characterizing Departures From Additivity In Multi-Dimensional Drug/Chemical Mixtures, Kathryn S. Dawson

Theses and Dissertations

In studies of the effects of multiple drug or chemical combinations, one goal may be to detect and characterize the interactions between the agents. The techniques currently applied to this problem have limitations when the experiments involve more than 2 agents. Certain response-surface techniques require an unrealistic number of observations for studies involving a large number of agents. Current graphical methods are impossible to use in studies of 3 or more agents. In this research two statistical techniques are described that can be applied to studies with an unlimited number of agents. In the first approach, dose combinations are collected …

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The Role Of Follicular Dendritic Cells In Human Immunodeficiency Virus Pathogenesis, Sonya Lynn Heath Jan 1995

The Role Of Follicular Dendritic Cells In Human Immunodeficiency Virus Pathogenesis, Sonya Lynn Heath

Theses and Dissertations

Infection with Human Immunodeficiency Virus-1(HIV) results in a disease process characterized by three stages: an acute phase characterized by viremia, a clinically latent stage with little or no detection of virus in the blood, and the last stage, AIDS, which. is characterized. by marked immunodeficiency. During clinical latency, CD4+ T cells decline over a period lasting from a few to several years. Throughout this period, HIV is found trapped on the surface of follicular dendritic cells(FDC) in the germinal centers of secondary lymphoid tissues and this is the primary site of active viral replication. We hypothesize that FDC, and the …

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Development Of A Comprehensive Base-Level Environmental Training Program For Total Environmental Compliance, William M. Barrett Jr Sep 1994

Development Of A Comprehensive Base-Level Environmental Training Program For Total Environmental Compliance, William M. Barrett Jr

Theses and Dissertations

The leadership of the Air Force has established a goal of total environmental compliance because it is the right and necessary thing to do. Commitment to this goal can be accomplished through strong leadership, however, achieving this goal can only be accomplished through effective training. The lack of consistent guidance for developing and executing comprehensive base- level environmental training programs has forced bases to develop these training programs by whatever means available to them. This has resulted in a broad variation in the thoroughness of base-level training programs throughout the Air Force. This research effort investigates the relationship between the …

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A Comparative Pharmacokinetic Study Of The Role Of Gender And Developmental Differences In Occupational And Environmental Exposure To Benzene, Elizabeth A. Brown Sep 1994

A Comparative Pharmacokinetic Study Of The Role Of Gender And Developmental Differences In Occupational And Environmental Exposure To Benzene, Elizabeth A. Brown

Theses and Dissertations

The purpose of this study is two-fold. First, it shows that physiological differences between men and women result in gender-specific exposures with respect to benzene. Second, it assesses the potential for a lactating woman's occupational and personal benzene exposure to impact a nursing infant's exposure, highlighting the possibility of subjecting an infant to the effects of industrial chemicals via breast feeding. This study employs physiologically based pharmacokinetic (PBPK) modeling to investigate the influence of physiological parameters and to evaluate the ability of inhaled benzene to transfer from mother to infant through breastmilk. The models are run through scenarios that simulate …

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Development Of Field Guidance For Assessing Feasibility Of Intrinsic Bioremediation To Restore Petroleum-Contaminated Soils, John T. Enyeart Sep 1994

Development Of Field Guidance For Assessing Feasibility Of Intrinsic Bioremediation To Restore Petroleum-Contaminated Soils, John T. Enyeart

Theses and Dissertations

This research evaluated the process of intrinsic bioremediation, also called natural attenuation, and the parameters that affected it. The goal of this study was to use these intrinsic bioremediation parameters to develop a valid prediction of the cleanup duration using this restoration technology. This analysis was limited to a JP-4 release and focused on the remediation of the BTEX constituents to a cleanup level of 10 ppm total BTEX. The review of intrinsic bioremediation found that the BTEX hydrocarbons can aerobically and anaerobically biodegrade. Of the many factors that affect intrinsic bioremediation, those that most influenced its occurrence were the …

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A Retrospective Quantitative Assessment Of Trichloroethylene Exposure Of Workers At Aircraft Maintenance Facilities At Hill Air Force Base Through The Use Of Modeling, Anthony O. Copeland Sep 1994

A Retrospective Quantitative Assessment Of Trichloroethylene Exposure Of Workers At Aircraft Maintenance Facilities At Hill Air Force Base Through The Use Of Modeling, Anthony O. Copeland

Theses and Dissertations

Monte Carlo simulation and source-receptor modeling are used to estimate the TCE exposures encountered by select workers at aircraft maintenance facilities at Hill Air Force Base between 1955 and 1979. An epidemiological study of this group, a retrospective cohort study of 14,457 workers who were employed at the base for a minimum of one year between 1952 and 1956, was headed by Dr. R. Spirtas of the National Cancer Institute to evaluate mortality associated with occupational exposure. One of the major conclusions of the study was that TCE 'probably does not pose a strong carcinogenic risk for man.' In the …

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