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Articles 5461 - 5490 of 5602
Full-Text Articles in Medicine and Health Sciences
The Great Potato Debate, James D. Hudson
The Great Potato Debate, James D. Hudson
Honors Theses
Anencephaly and spina bifida cystica are two of the most common severe congenital malformations consistently observed in human populations. Both represent defects in the neural tube and share a significant number of similar epidemiological associations among them, occupational class, geography, sex ratio, maternal age, year and season of the year. In anencephaly most of the brain and upper skull never form usually resulting in death within a few hours of birth. Spina bifida cystica is a malformation of the spinal cord often causing paralysis, vulnerability to infection, and early death. In 1972, Dr. J.H. Renwick presented a controversial hypothesis which …
Bone Regeneration Over Submerged Dental Roots In Dogs, Roger Lee Plata
Bone Regeneration Over Submerged Dental Roots In Dogs, Roger Lee Plata
Loma Linda University Electronic Theses, Dissertations & Projects
Nonendodontically treated roots were submerged 1.5 to 2.0 mm. below the alveolar crest in three dogs. Twelve roots were treated in this manner. Regeneration of alveolar bone can be seen in three weeks with complete bone coverage in five weeks. A complete lamina dura can be seen around the amputated roots.
Bone failed to regenerate over two of the twelve roots. In one case there was delayed healing due to the early loss of some sutures. A sinus tract developed connecting the oral environment with the contents of the pulp. This led to bone resorption and a necrotic pulp. In …
The Deoxythymidine Kinase-Deoxythymidylate Kinase Enzymes In Salmonella Potsdam And Escherichia Coli K12 Infected With Bacteriophage P3, James D. Kettering
The Deoxythymidine Kinase-Deoxythymidylate Kinase Enzymes In Salmonella Potsdam And Escherichia Coli K12 Infected With Bacteriophage P3, James D. Kettering
Loma Linda University Electronic Theses, Dissertations & Projects
Metabolic alterations in bacterial hosts caused by virus infections have been studied for the last thirty years. The virulent T-even bacteriophages have been studied the most and have been shown to be responsible for the induction of a number of new, virus-specific enzymes that are necessary for successful phage growth. In addition, the activity of other host enzymes present prior to infection has been found to be increased by T-even infection. Temperate bacteriophages, being more difficult to work with than the virulent viruses, have not been studied as extensively. This is especially true for metabolic studies, since most temperate phage …
The Developmental Fine Structure Of Pacinian Corpuscles, Pedro B. Nava
The Developmental Fine Structure Of Pacinian Corpuscles, Pedro B. Nava
Loma Linda University Electronic Theses, Dissertations & Projects
A preliminary light microscopic study of the mouse hind limb revealed a group of about 20 Pacinian corpuscles extending from the mid-region of the fibula to the tibio-fibular fusion strategically located for the possible sensing of bone-transmitted vibration.
The fine structure of the corpuscles is described in four stages: primordial or prenatal (19 and 20 days); early differentiation (1-8 days postnatal); differentiated corpuscle (9, 10, 12, 14 and 21 days postnatal); and adult (28 days old).
The corpuscles commence development during the 19th prenatal day. The corpuscle then consists of a nerve ending surrounded by sheath-cells which appear to be …
Effects Of Cocaine, Nicotine And Diet On Voluntary Alcohol Consumption In Rats, Zaida Raquel Cordero Loayza
Effects Of Cocaine, Nicotine And Diet On Voluntary Alcohol Consumption In Rats, Zaida Raquel Cordero Loayza
Loma Linda University Electronic Theses, Dissertations & Projects
The consumption of alcohol is a problem not only in this country (U.S.), but also in many other places in the world. Thus we find the Indians in Peru, Bolivia and other neighboring countries (Ecuador and northern part of Argentina) consuming alcohol to the point that they become alcoholics, in addition to this they also chew coca leaves, plant from which cocaine is extracted.
In an effort to establish the cause for this behavior, we put Sprague-Dawley albino rats on either a poor or good basal diet. Once every other day the rats were injected with a solution of cocaine. …
Histologic Comparison Of Apical Tissue Response To Endodontic Overfills With Gutta Percha And Grossman's Sealer Vs. Sargenti Method (N₂), Donald L. Brewer
Histologic Comparison Of Apical Tissue Response To Endodontic Overfills With Gutta Percha And Grossman's Sealer Vs. Sargenti Method (N₂), Donald L. Brewer
Loma Linda University Electronic Theses, Dissertations & Projects
This study compared endodontic overfills of N2 and gutta percha-Grossman's Sealer from a histopathological basis. The study employed four male rhesus monkeys and a sample of 31 teeth.
The most obvious difference between the samples filled with N2 and the gutta percha-Grossman's Sealer samples was the recurring presence of ankylosis in the N2-treated teeth. Results also included bone necrosis, inflammation and root and bone resorption.
The N2 samples were considered to have evidenced greater violence of reaction apically.
Flowering Plants Of Omega Mine, Table Mountain, Tuolumne County, California, Mary Wilcox
Flowering Plants Of Omega Mine, Table Mountain, Tuolumne County, California, Mary Wilcox
University of the Pacific Theses and Dissertations
The flora of California has been studied as a whole, but with the exception of Yosemite Valley few specific areas in Tuolumne County have been investigated.
The area chosen for this investigation was approximately forty acres of the lava flow known as Table Mountain. This forty acres is located in the southeast portion of the Omega Mine near Rawhide Flat, Tuolumne County, California. The decision to use this area for study was based on its relative freedom from man's influence and its accessibility. The Omega Vine belongs to the author and its use was restricted during the period of investigation
Effects Of Unilateral Ablation Of The Optic Nerve In Feral Mus Musculus, Otha Ray Rains Jr.
Effects Of Unilateral Ablation Of The Optic Nerve In Feral Mus Musculus, Otha Ray Rains Jr.
University of the Pacific Theses and Dissertations
The general organization and 'function of the vertebrate visual system has been under Investigation since the late nineteenth century (Gudden, lS7Qa, Gudden, 1870b). The organization of optic tracts and subcortical optic centers for the majority of vertebrates studied are found to be similar in both structure and function (Gudden, 1870a, Gudden, 1870b, Minkowski, 1913» Minkowski, 1920, and Lashley, 193^a). The sense organ, the eye, contains specific photoreceptor cells designated as either retinal rods or retinal cones. These two types of retinal cells possess an ability to convert light quanta into nerve impulses. The nerve impulses are transmitted via the optic …
Comparison Of Interferon Produced In Vitro By Monkey Kidney Cells Demonstrating Interference Against Polio Ii, Coxsackie A-9, Influenza A2/Hong Kong/68, And Echo-9 Viruses, Archer Duncan Farmer Jr.
Comparison Of Interferon Produced In Vitro By Monkey Kidney Cells Demonstrating Interference Against Polio Ii, Coxsackie A-9, Influenza A2/Hong Kong/68, And Echo-9 Viruses, Archer Duncan Farmer Jr.
Biological Sciences Theses & Dissertations
Abstract unavailable
Effect Of Speed Of Muscle Contraction On Strength Improvement, Terry Alan Dieckhoff
Effect Of Speed Of Muscle Contraction On Strength Improvement, Terry Alan Dieckhoff
Masters Theses
No abstract provided.
The Effects Of Atropine On The Growth And Respiration Of Two Species Of Bacteria Normally Inhabiting The Human Gastro-Intestinal System, Mary M. Ramos
The Effects Of Atropine On The Growth And Respiration Of Two Species Of Bacteria Normally Inhabiting The Human Gastro-Intestinal System, Mary M. Ramos
Theses & Dissertations
It is the purpose of this study to determine whether the drug atropine has an effect on bacteria found normally inhabiting the human body, most specifically the gastrointestinal system. Atropine is one of the oldest drugs in medicine. It is derived from the roots and leaves of solanaceous plants such as henbane and Jimson weed. Atropine is often termed a belladonna alkaloid because it can also be found in the deadly nightshade plant, Atropa belladonna. Atropine is a highly competitive antagonist of acetylcholine at receptor sites in smooth muscles, cardiac muscle, and various glandular cells (5). Therefore, its effects are …
Phytoplankton Succession In The Lafayette River, Estuary, Norfolk, Virginia, Thomas W. Purcell Lll
Phytoplankton Succession In The Lafayette River, Estuary, Norfolk, Virginia, Thomas W. Purcell Lll
Biological Sciences Theses & Dissertations
Abstract unavailable.
Experimentation To Develop Procedures To Be Used In The Investigation Of The Effects Of Restriction On The Unmodified Dna Of The Bacteriophage Lamda, John Haynes
Honors Theses
The results of experimentation approximately twenty years ago with variuos bacteriophages by Ralston and Krueger16, Anderson and Felix1, Luria and Human12, and by Bertani and Weigle2 have shown that the host range of a given phage depends directly on the bacterial strain on which the phage has last propagated. This event came to be known as host-induced modification or host-controlled variation. As this phage host range is controlled by the host environment and can be altered from one generation to another it has, according to Luria, made microbiology "the last stronghold of Lamarckism" …
The Effect Of Post-Operative Use Of Chlorhexidine On Periodontal Regeneration In Monkeys With Chronic Bifurcation Defects, J. Pat Bishop
The Effect Of Post-Operative Use Of Chlorhexidine On Periodontal Regeneration In Monkeys With Chronic Bifurcation Defects, J. Pat Bishop
Loma Linda University Electronic Theses, Dissertations & Projects
Periodontal regeneration and inflammation was evaluated histometrically in 36 paired teeth in six macque(sic) monkeys with chronic bifurcation defects. Daily topical TL Chlorhexidine was applied to one-half of the teeth, saline to the other half for six weeks after the bifurcation defects were surgically debrided. Measurements were made from a section taken from the mid-bifurcation for each tooth. The results demonstrated no significant difference in the area of inflammatory response or the degree of regenerative capacity of post-operative healing between Chlorhexidine treated and paired nontreated control teeth.
Viability Of Dentin In Rats Incisors : Fluid Movement In Pulpless, Endodontically Treated, And Normal Teeth In Rats, Maria Luisa Canales
Viability Of Dentin In Rats Incisors : Fluid Movement In Pulpless, Endodontically Treated, And Normal Teeth In Rats, Maria Luisa Canales
Loma Linda University Electronic Theses, Dissertations & Projects
It is a well established fact that there is a fluid transport system through the dentin, however to the present time very little has been done regarding this system in teeth that have been endodontically treated.
The present work was conducted in vivo using the lower incisors of rats as the medium for the study.
A selected number of Sprague Dawley rats (36 animals), whose average age was 60 days, and whose body weight averaged about 180 grams, were given an anesthetic of Sodium Pentabarbitol, .05 to .07 ml. per 100 grams body weight. This anesthetic was injected intraperitoneally.
The …
A Method Of Analyzing Mandibular Movement, Richard B. Mccoy
A Method Of Analyzing Mandibular Movement, Richard B. Mccoy
Loma Linda University Electronic Theses, Dissertations & Projects
Mandibular movement is considered to be a fundamental factor in the study, analysis, and treatment of occlusion. For many years, dentists have realized that dental health depends upon the compatibility of mandibular movements and occlusion. This realization has led to the development of new methods and techniques for recording accurately and scientifically the movements of the mandible. In order for this data to be of scientific value, it must be stored in a usable form which is easily available for analysis.
The purpose of this research project was to develop a procedure for storing and recalling mandibular-movement information. Before such …
Role Of Membrane-Associated Components Of Mycoplasma Arthritidis On The Biosynthesis Of Humoral Antibodies And Arthritogenic Properties In Experimental Animals, Lois M. Bergquist
Role Of Membrane-Associated Components Of Mycoplasma Arthritidis On The Biosynthesis Of Humoral Antibodies And Arthritogenic Properties In Experimental Animals, Lois M. Bergquist
Loma Linda University Electronic Theses, Dissertations & Projects
The virulence of animal-passaged Mycoplasma arthritidis (158) was demonstrated to be enhanced in rats by growth in oleic acid-enriched broth. The virulence of a laboratory-maintained culture of the same strain was unaffected by similar growth conditions. No differences either in the immune response as measured by complement-fixing (CF) antibodies or in the histogenesis of the disease were detected when rats were injected with animal-passaged M. arthritidis grown either in the presence or in the absence of oleic acid. All tests for metabolism-inhibiting (MI) antibodies in the rat were negative.
A Mycoplasma-associated immunosuppression of the primary and of the secondary hemagglutinin …
Effect Of Post-Operative Use Of Chlorhexidine On Regeneration Of Bifurcation Defects In Dogs, Gary Bogle
Effect Of Post-Operative Use Of Chlorhexidine On Regeneration Of Bifurcation Defects In Dogs, Gary Bogle
Loma Linda University Electronic Theses, Dissertations & Projects
The daily post-operative use of topical chlorhexidine application has been compared to daily toothbrushing. Periodontal defects were experimentally created in the bifurcations of lower premolars in dogs. The defects were treated by surgical debridement. Chlorhexidine application and toothbrushing were performed post-operatively for six weeks on contralateral pairs of teeth. The amounts of connective tissue and bone regeneration were evaluated from microscopic sections of the bifurcation areas. No difference between chlorhexidine and tooth brushing was found for the connective tissue attachment. However, significantly more bone had regenerated in the chlorhexidine treated areas than the tooth brushed area.
Kinesiology Of Knee Flexion Deformity Using Electromyography, Paul J. Roby
Kinesiology Of Knee Flexion Deformity Using Electromyography, Paul J. Roby
Loma Linda University Electronic Theses, Dissertations & Projects
A kinesiological electromyographic study was completed to determine the relative changes in muscle activity as a person walks and stands with different degrees of knee flexion deformity. The ultimate aim was to establish criteria for appropriate preventive and corrective measures relating to knee flexion deformity.
Six different muscles were implanted with wire electrodes. The subjects performed a series of walking and standing experiments with the knee flexed at selected angles by a locking leg brace to simulate knee flexion deformity. The electromyographic action potentials were monitored by analog tapes, oscilloscopes and closed circuit television. The analog tapes were displayed on …
The Dietary Intake Of Preschool Children Attending The Public Health Clinics In San Bernardino, California, Glendover V. Brown
The Dietary Intake Of Preschool Children Attending The Public Health Clinics In San Bernardino, California, Glendover V. Brown
Loma Linda University Electronic Theses, Dissertations & Projects
Preschool children attending Well Baby Clinics directed by the Public Health Department of San Bernardino, California, were the sub jects in this study. The purpose of the study was (1) to compare the eating pattern and habits of the preschool children attending the San Bernardino Public Health Clinics, (2) to assess any differences in the dietary intake of the three major ethnic groups, namely, Mexican- Americans, Whites, and Blacks, and (3) to determine the adequacy of the dietary intake of the preschool children attending the San Bernardino Clinics. One hundred and seventy-seven subjects in this study included 51 Mexican-Americans, 74 …
A New Me: A Study In Diet Therapy, Marsha Ellis
A New Me: A Study In Diet Therapy, Marsha Ellis
Honors Theses
Obesity is a major problem in our nation today. It Seems that we are eating too much and exercising too little. We can analyze, discuss, and write about obesity from now through eternity. However all of this is in vain, unless it causes us to lose weight.
A Medicated Dry Foam For Local Therapy In Infected Burns, Patrick Nicholas Catania
A Medicated Dry Foam For Local Therapy In Infected Burns, Patrick Nicholas Catania
University of the Pacific Theses and Dissertations
Local burn therapy usually includes the application of medicated ointments and dressings in order to minimize and eradicate infection. As this approach to local therapy may present problems regarding application and removal techniques, it was the purpose of this study to formulate a topical dosage form that may be applied to denuded areas of the skin without inunction. Using the concept of topical films, a dosage form was formulated that is highly water soluble, flexible , and adherent to both denuded and intact areas of the skin.
The Effects Of Crowding On The Diurnal Ascorbic Acid Levels Of Albino Rats, Mary Jo Barr
The Effects Of Crowding On The Diurnal Ascorbic Acid Levels Of Albino Rats, Mary Jo Barr
Masters Theses
The adrenal physiology of the albino rat was studied through the measurement of adrenal ascorbic acid levels. A cyclic phenomenon was observed which follows the diel periodicity of the animal. Ascorbic acid values were found to be characteristically higher in males than in females. A similar difference was also seen in populations divided into young animals (body weight less than 175 grams) and old animals (body weight greater than 175 grams). Crowding, induced by manipulating the area of cage space per gram of body weight, was observed to be a definite stressor and caused the adrenal ascorbic acid levels to …
Anticoagulant Half-Life Of Heparin In Human Subjects With Normal And Impaired Renal Function., Paul James Perry
Anticoagulant Half-Life Of Heparin In Human Subjects With Normal And Impaired Renal Function., Paul James Perry
University of the Pacific Theses and Dissertations
Numerous investigators have noted that individuals vary widely in their response to the anticoagulant, heparin. Animal model3 have suggested that patients with depressed renal function would be expected to clear heparin from the blood at a slower rate than patients with normal renal function.
Utilizing the Activated Coagulation Time clotting test, a method was developed to determine the anticoagulant half-life of heparin. The study calculated the half-life of heparin in a group of individuals with normal renal function and a population of patients in chronic renal failure. Intravenous heparin doses of 0,3 units/ml and 0.6 units/ml of blood were administered …
The Identification And Analysis Of Factors Which Influenced Georgia Southern College Recreation Major Graduates Who Have Taken Full Time Recreation Positions To Leave The Recreation Profession, Wayne Lamar Gay
Legacy ETDs
No abstract provided.
Seasonal Variation In The Tubular And Interstitial Areas Of The Testes In Sternotherus Odoratus L., Robert Hans Spaet
Seasonal Variation In The Tubular And Interstitial Areas Of The Testes In Sternotherus Odoratus L., Robert Hans Spaet
Masters Theses
Seasonal changes within the tubular and interstitial areas of the testes in Sternotherus odoratus are investigated, histologically and histochemically. Forty specimens were collected in Illinois, Tennessee and Louisiana between May, 1969 and August, 1972.
Many of the histological and macroscopic observations made by Risley (1938) on the spermatogenic cycle of S. odoratus in Michigan are confirmed. Contrary to his findings, fluctuations in interstitial cell nuclear diameters are observed during spermatogenesis. Greatest diameters coincide with what Risley has considered " . . . period of most active breeding." Sertoli cell nuclear diameters undergo similar fluctuations being greatest during spring breeding and …
The Effects Of Acute Stress On Adrenal Ascorbic Acid Levels, Robert Joseph Collier
The Effects Of Acute Stress On Adrenal Ascorbic Acid Levels, Robert Joseph Collier
Masters Theses
The diurnal rhythm of adrenal ascorbic acid (DAR) displays an inverse relationship to the diurnal rhythm of circulating levels of plasma corticosteroids. Alloxan monohydrate, 175 mg/kg body weight was given subcutaneously to albino rats to determine the effect of the diabetic state on the DAR. A total of 200 female albino rats were divided into two study groups. Study Group I was composed of 150 animals divided into populations of 15, each including 3 controls. Study Group II was composed of populations of 5, each group containing all controls or all alloxinated rats. The populations of 15 were sacrificed at …
X-Ray-Induced Specific-Locus Mutation Rates In Newborn And Young Mice, Paul Bruce Selby
X-Ray-Induced Specific-Locus Mutation Rates In Newborn And Young Mice, Paul Bruce Selby
Doctoral Dissertations
The specific-locus mutation frequency resulting from 300 R of acute X irradiation has been determined for the germ cells present in male mice at 0, 2, 4, 6, 8, 10, 14, 21, 28, and 35 days of age and also for female mice at 0 days of age, Sample size was much larger for the males irradiated on day 0 than for other age groups but in all groups it was large enough to insure that an extremely high rate would be noticed. At 35 days of age the testis is histologically similar to that of the adult. It was …
Effects Of Dietary Factors And Morphine Administration On Voluntary Alcohol Consumption And Dopamine Metabolism In Rats, Claudia Smithson
Effects Of Dietary Factors And Morphine Administration On Voluntary Alcohol Consumption And Dopamine Metabolism In Rats, Claudia Smithson
Loma Linda University Electronic Theses, Dissertations & Projects
The effect of diet and dietary additives on voluntary alcohol consumption in male Sprague-Dawley rats was studied. Alcohol intake measured weekly and reported as ml of a 10% solution ingested per 100 grams body weight. A four week pre-experimental period was designed to determine individual tendencies to drink and thus to eliminate the high and low drinkers from the study. No difference was found in alcohol intake with either starch or sugar as the carbohydrate source; however, there was a greater weight gain ( p < .025) in those animals consuming sugar-based diets. Rats on poor-quality diets containing minimal amounts of vitamins and minerals continued to gradually increase alcohol consumption during the study. This diet, supplemented with coffee, caused the greatest significant increase in alcohol intake and the lowest weight gains. Addition of coffee to the diets significantly increased alcohol consumption (p< .005) but decreased growth rate (p < .0005) . However, when the poor quality diets were supplemented with vitamins and minerals, alcohol consumption was reduced by about 50% (p < .005) and weight gain was significantly increased (p < .0005).
The daily intraperitoneal administration of morphine sulfate significantly decreased alcohol intake (p < .02) and the per cent of total fluid consumed as alcohol (p < .02) but did not effect water consumption.
An attempt was …
Spectral Analysis Of Olfactory System Electrical Activity: Effects Of Ketamine And Sodium Pentobarbital, John Ludwig Orr
Spectral Analysis Of Olfactory System Electrical Activity: Effects Of Ketamine And Sodium Pentobarbital, John Ludwig Orr
Masters Theses
No abstract provided.