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Articles 5461 - 5490 of 5555
Full-Text Articles in Medicine and Health Sciences
Cardioregulatory Role Of The Abdominal Ganglion Of Aplysia Californica, George Maeda
Cardioregulatory Role Of The Abdominal Ganglion Of Aplysia Californica, George Maeda
Loma Linda University Electronic Theses, Dissertations & Projects
An isolated heart-abdominal ganglion preparation of this mollusc was developed and used to study the cardioregulatory function of the ganglion and nerves. The heart was perfused with artificial sea water through an atrial cannula and the gastro-esophageal artery was catheterized for blood pressure monitoring. The presence and cardioregulatory effects of axons in the nerves was investigated by electrical stimulation. Fine-tipped glass microelectrodes inserted into ganglionic neurons were used to determine the relationship between the neuronal and cardiac activities.
The principal results are listed below.
- Primarily inhibitory responses are obtained from both right and left connective stimulation, with some evidence for …
The Effects Of Cs Habituation And Duration Of The Directional Modification Of The Cardiac Response In The Guinea Pig (Cavia Procellus), Ray Charles Larson
The Effects Of Cs Habituation And Duration Of The Directional Modification Of The Cardiac Response In The Guinea Pig (Cavia Procellus), Ray Charles Larson
All Master's Theses
The present experiment examined the effects of CS habituation and two different levels of CS duration (60 versus 6 sec) on the directional modification of the conditioned cardiac response in the guinea pig. The results indicated that the only reaction to the CS, regardless of prior habituation or CS duration, was a decelerative conditioned HR response. However, habituation to a CS prior to classical aversive conditioning was found to attenuate the magnitude of the bradycardia CR that developed. The bradycardia CR was discussed in terms of being a cardiac component of the orienting response.
Sub-Aversive Response Contingent Foot Shock As A Positive Reinforcer, Robert Lea Fulwiler
Sub-Aversive Response Contingent Foot Shock As A Positive Reinforcer, Robert Lea Fulwiler
All Master's Theses
Forty-eight rats were divided into 8 groups; four were maintained under normal conditions and the other four under sensory deprivation and tested at o, 3, 6, and 9 days after condition institution. The response was placing the head through a hole in the operant chamber and the stimulus (0, 1.2, 4, or 12 Vac) was contingent upon the response. Analysis ot variance disclosed significant differences (p<.01) between the deprived and the non-deprived groups at days 6 and 9; and a significant interaction between deprivation condition and time of test. No differences were shown between the stimulus intensities indicating that the stimulus did not have a reinforcing effect.
The Effect Of Elevated Glucose On Neutrophilic Phagocytosis In Genetically Diabetic Mice, Larry B. Thompson
The Effect Of Elevated Glucose On Neutrophilic Phagocytosis In Genetically Diabetic Mice, Larry B. Thompson
Loma Linda University Electronic Theses, Dissertations & Projects
Infiltration to an injury site or area of bacterial contamination by polymorphonuclear leucocytes (or neutrophils) is an early and essential phase of the early inflammatory reaction. Their action on foreign matter is the most critical step taken by body defense mechanisms in the first 24 hours. Anything which interferes with that action, phagocytosis, greatly hampers early inflammation. This study was designed to see the effect of elevated glucose levels on neutrophil phagocytosis in a unique strain of genetically diabetic mice.
Twenty-two diabetic and twenty-four control female mice were used. Blood glucose determinations and total white counts were made on each …
The Response Of Gingival Tissues To Alterations In Ph, Robert C. Jann
The Response Of Gingival Tissues To Alterations In Ph, Robert C. Jann
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study was to evaluate the histopathological and clinical changes that occurred when a continuous supply of exogenous acid or base, at varying pH, was delivered adjacent to the gingival crest of the monkey. A related goal was to develop a monkey model system which would deliver test solutions continuously and atraumatically, to the experimental gingival sites.
Two young adult female monkeys had a perfusion apparatus attached to certain maxillary teeth so that test solutions were deposited atraumatically to the marginal gingival tissues. During the experimental periods the animals were kept in primate restraining chairs and fed …
Bacteriuria As A Precursor Of Intracatheter Encrustation, Namcy Moll
Bacteriuria As A Precursor Of Intracatheter Encrustation, Namcy Moll
Loma Linda University Electronic Theses, Dissertations & Projects
The problem with which this study was concerned was the development of criteria that could be used to determine when urinary catheter changes were necessary. By determining when encrustation occurred, it was felt that some complications could be eliminated by changing catheters before obstruction occurred due to encrustation.
It was the purpose of this study to: 1) explore some indications for catheter change, 2) determine if encrustation of urinary catheters necessitates catheter change, and 3) estimate potential criteria for a routine time for catheter changes.
Forty-five catheters were examined after their removal from patients. Flow rates were determined on 33 …
Histopathological Variations Of Periapical Granulomas And Radicular Cysts, Thanapen Kanchanasut
Histopathological Variations Of Periapical Granulomas And Radicular Cysts, Thanapen Kanchanasut
Loma Linda University Electronic Theses, Dissertations & Projects
The periapical dental granuloma and cyst is the most frequent sequela of pulpitis. These lesions are always intraosseous and often become quiescent after the acute phases are over, forming a space which primarily consists of chronic inflammatory tissue. This chronic inflammatory tissue usually appears as a one-centimeter area of punched out bone on the x-ray film and is referred to as a dental granuloma. Should epithelium choose to proliferate in this inflammatory area, it may undergo subsequent cystic degeneration forming the typical periapical cyst. While much has been written with regard to the etiology and treatment of the apical cyst …
A Histochemical Study Of The Neurosecretory Cells In The Sub Pharyngeal Ganglia And Ventral Nerve Cord Of Lumbricus Terrestris And Their Response To The Removal Of The Suprapharyngeal Ganglia And To Osmotic Regulation, Bernard F. Orenstein
Masters Theses
No abstract provided.
Activity Analysis Of Personnel On Patient Trayline Assembly, June Bishop
Activity Analysis Of Personnel On Patient Trayline Assembly, June Bishop
Loma Linda University Electronic Theses, Dissertations & Projects
The systems approach in food service administration is the initial step in analyzing current procedures to determine the effectiveness of resource utilization. Analysis begins with observation of a system to provide possible explanations of the system behavior.
The purpose of this research was to determine through work sampling the proportion of both productive and nonproductive labor time of operators on the tray assembly, the labor time and labor cost required in each position and for each meal, and to test the hypothesis that there was no significant difference between the productivity index (trays per minute) during Phase A and Phase …
A Pharmacologic Investigation Of The Antiinflammatory Activity Of Cryogenine, Donald Saadia Kosersky
A Pharmacologic Investigation Of The Antiinflammatory Activity Of Cryogenine, Donald Saadia Kosersky
University of the Pacific Theses and Dissertations
This study was conducted in an attempt to define the anti inflammatory efficacy of cryogenine, the major alkaloid of Heimia salicifolia Link and Otto. The anti inflammatory effects produced by cryogenine, phenylbutazone, indomethacin, mefenamic acid, paramethasone, hydrocortisone and 6-mercaptopurine were compared considering the sequential changes in various motameters during the course of adjuvant-induced polyarthritis in rats. Polyarthritis was induced by the subplantar injection of a suspension of heat-killed Mycobacterium butyricus in mineral oil into the right hind paw of Sprague-Dawley rats. The manifestations of the diseases were monitored in terms of hind paw swelling, subjective appearance of secondary lesions, impairment …
Representative Personality Dimensions Characteristic Of Different Occupational Choice In The Paramedical Field, Priscilla Bernadette Campos
Representative Personality Dimensions Characteristic Of Different Occupational Choice In The Paramedical Field, Priscilla Bernadette Campos
University of the Pacific Theses and Dissertations
The purpose of this study was to ascertain if there are similarities and differences that differentiate one paramedical group from another in the realm of non-intellectual characteristics. Senior students and successful practitioners in four paramedical groups selected were Registered Nurse. Licensed Vocational Nurse, medical Assistant, and Dental Assistant.
The Immediate Effect Of Swimming And Track Competition On Blood Ph Values, James B. Knott
The Immediate Effect Of Swimming And Track Competition On Blood Ph Values, James B. Knott
Masters Theses
The purpose of the study was to investigate the changes associated with blood pH and different exercise work loads during competition. Finger tip blood samples (1 milliliter), were obtained from 33 male subjects from the varsity swimming and track teams of Eastern Illinois University. The samples were taken prior to exercise and between three and seven and one half minutes after cessation of the event. The blood samples were analyzed with a Radiometer Micro Blood pH Unit. The subjects were chosen on the basis of the events in which they competed. The swimming subjects competed in the 100, 200, 500, …
A Comparison Of Ecs And Drug Induced State-Dependent Learning, Mayse F. John
A Comparison Of Ecs And Drug Induced State-Dependent Learning, Mayse F. John
All Master's Theses
The purpose of the present experiment is twofold: (a) to determine if FS and ECS or just ECS can be used as an agent to produce "dissociated" learning in a multi-trial procedure, and (b) if shown, to determine the effectiveness of these agents relative to three different dosages of sodium pentobarbital preselected to produce no, moderate, and complete dissociation.
Labor Time Analysis By Work Function Activity In Production Of Vegetarian Entrees, Maynard W. Lebrun
Labor Time Analysis By Work Function Activity In Production Of Vegetarian Entrees, Maynard W. Lebrun
Loma Linda University Electronic Theses, Dissertations & Projects
The specific objectives of this research were to (1) develop a method for determining labor time and labor cost of cooks by work functions in the production of selected vegetarian entrees, and (2) determine the percentage relationship of cooks' labor to food cost in selected classifications of entrees.
Application of the continuous time study methodology as developed in this research was restricted to the observation of entree cooks in a 408 bed non-profit university hospital. Observation of work function activities during the first week of a four week cycle menu for three consecutive cycles was classified under three major categories: …
Molecular Weight Determinations Of Some Salmonella Potsdam Bacteriophage Dna's, Winston H. Richards
Molecular Weight Determinations Of Some Salmonella Potsdam Bacteriophage Dna's, Winston H. Richards
Loma Linda University Electronic Theses, Dissertations & Projects
Two group A phages, P9c/2 and P4/2, were studied. Their density, sedimentation velocity, and biochemical properties were compared. Their densities were determined by density gradient centrifugation in 38.3% cesium chloride. Sedimentation velocity was used to determine their molecular weights. To accomplish this, the DNA of P9c/2 and P4/2 was labeled with tritium and T2 DNA, labeled with 32P, was used as a standard. The DNA of P9c/2 and P4/2 was separately mixed with T2 DNA and centrifuged in a 0-15% sucrose gradient. The molecular weights were calculated using the formula D2/D1= (M2 …
Adherence Of Men With Myocardial Infarction To Prescribed Exercise, Marsha Schwartz
Adherence Of Men With Myocardial Infarction To Prescribed Exercise, Marsha Schwartz
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study was to find out if men with myocardial infarction followed exercise prescribed by the physician. The reasons the patients did or did not follow the exercise prescription were investigated.
An interview guide was used to gather the data for this exploratory study. The questions on the interview guide were designed to obtain information to compare the former exercise pattern of the patient to exercise after infarction. Adherence to the exercise prescription was also determined by the exercise reported in the interview. Fifteen male subjects who had myocardial infarction were interviewed in the hospital and after …
An In Vivo Perfusion Apparatus For Studies On Gingival Disease In The Albino Rat : Assessment By A Perfusion Of The Enzymes Collagenase And Hyaluronidase, James A. Smith
Loma Linda University Electronic Theses, Dissertations & Projects
This thesis describes an in vivo perfusion apparatus which can continuously deliver controlled quantities of solutions to localized, contralateral intraoral areas in albino rats. Three animals were per fused on the experimental area (the mesial sulcular area of the maxillary first molar) on one side with tap water and Trypan blue. Localization of the solution delivered and minimal histological changes due to the presence of the apparatus was demonstrated on these animals. Solutions of .5%, 1%, and 2% hyaluronidase and collagenase were perfused on the experimental areas of nine animals. When both enzymes were used, hyaluronidase always preceded collagenase in …
A Study To Demonstrate The Immediate Destination Of An Embolus Formed In The Lumen Of A Peripheral Venous Catheter, Rosemarie Morikone Emori
A Study To Demonstrate The Immediate Destination Of An Embolus Formed In The Lumen Of A Peripheral Venous Catheter, Rosemarie Morikone Emori
Loma Linda University Electronic Theses, Dissertations & Projects
This study was designed to show the immediate destination of an embolus formed in the lumen of an intravenous catheter placed in a peripheral vessel. The hypothesis stated that clots injected into a peripheral vessel will lodge in the lungs. A subhypothesis was that the clot may lodge anywhere along the circulatory pathway.
Indications of need for the study as shown by the review of literature were the following: (1) the complications resulting from the frequent use of intravenous polyethylene catheters, (2) experimental studies that showed that clots were formed around intravenous catheters, (3) the evidence that intravenous catheters predispose …
A Comparative In Vitro Metabolic Study Of Certain Pesticidal Phenyl N-Methyl-Carbamates, Larry A. Wheeler
A Comparative In Vitro Metabolic Study Of Certain Pesticidal Phenyl N-Methyl-Carbamates, Larry A. Wheeler
Loma Linda University Electronic Theses, Dissertations & Projects
Two critical parameters in the evaluation of the toxicological hazards of the use of carbamate pesticides are: (1) a rapid, sensitive, and precise analytical method of identification of the carbamate and its metabolites; and (2) their metabolism. A method in this study was developed whereby various carbamates and their metabolites could be chromatographed in the gaseous phase. Also, a comparative in vitro study of 15,000 g liver supernatants from human, rat, and dog was performed. Additional tissues investigated for metabolic activity toward the carbamates, Zectran and Mesurol, were kidney (from the dog only) and various blood fractions (red blood cells, …
Effects Of Diet And Stress On Gastric Lesions In Albino Rats And Guinea Pigs, Naomi Mckenzie
Effects Of Diet And Stress On Gastric Lesions In Albino Rats And Guinea Pigs, Naomi Mckenzie
Loma Linda University Electronic Theses, Dissertations & Projects
Studies were conducted to (1) investigate whether any protective factor is present in fresh water-cured olives or fresh cabbage as compared with the heated supplements against stress-induced gastric lesions in rats maintained on a nutritionally adequate diet for six weeks, (2) determine the relative protective factor in water-cured olives as compared with cabbage, (3) study the effect of black pepper in combination with fresh cabbage and olives and heated cabbage and olives in rats that were fed the same nutritionally adequate diet, and (4) investigate the effects of the same dietary components—cabbage and olives--on histamine- induced gastric lesions in guinea …
The Effectiveness Of Camphorated Paramonochlorophenol, Metacresyl Acetate, And Prednisolone In Combination As An Antimicrobial Agent, Maurice Cutler
The Effectiveness Of Camphorated Paramonochlorophenol, Metacresyl Acetate, And Prednisolone In Combination As An Antimicrobial Agent, Maurice Cutler
Loma Linda University Electronic Theses, Dissertations & Projects
Post-treatment discomfort following endodontic procedures can be caused by inflammation due to injudicious use of intracanal medicaments. Camphorated paramonochlorophenol, metacresyl acetate, and prednisolone in combination is advocated to reduce the inflammatory potential of the germicide and thus reduce the occurrence of post-operative pain. It is imperative that a medicament retain antimicrobial activity while reducing inflammatory potential.
This investigation was undertaken toward determining on an in vitro quantitative bactericidal versus bacteriostatic basis by use of the broth dilution test tube method whether camphorated paramonochlorophenol, metacresyl acetate, and prednisolone in combination retains antimicrobial activity comparable to selected other commonly used nonspecific germicides. …
The Comparative Morphology Of The Female Gonads Of Two Members Of The Nematode Order Tylenchida, Owen G. Coker
The Comparative Morphology Of The Female Gonads Of Two Members Of The Nematode Order Tylenchida, Owen G. Coker
Masters Theses
No abstract provided.
The Role Of The Suprapharyngeal Ganglia Of Lumbricus Terrestris In Respiratory Metabolism, John D. Nelson
The Role Of The Suprapharyngeal Ganglia Of Lumbricus Terrestris In Respiratory Metabolism, John D. Nelson
Masters Theses
No abstract provided.
The Effect Of Exercise On Metabolic Rate With Time In Overweight And Normal Weight Subjects, Roberta Jewell Keswick
The Effect Of Exercise On Metabolic Rate With Time In Overweight And Normal Weight Subjects, Roberta Jewell Keswick
Loma Linda University Electronic Theses, Dissertations & Projects
Previous studies in the Lome Linda University laboratory showed that obese subjects on an exercise program lost approximately one pound more per week as compared to a non-exercise group. Energy expenditure calculations of the exercise did not account for the total caloric deficit required to lose the additional pound. The present study was designed to investigate changes in BMR and metabolic rate with time for normal weight and overweight subjects involved in a practical exercise program. The relationship of changes in BMR and metabolic rate in coping with the problems of obesity were also studied.
Fifteen subjects, eight overweight and …
Mandibular Nerve Regeneration Through Solid And Canalized Bone And Plaster Grafts, Lawrence D. Day
Mandibular Nerve Regeneration Through Solid And Canalized Bone And Plaster Grafts, Lawrence D. Day
Loma Linda University Electronic Theses, Dissertations & Projects
Utilizing an extra-oral approach and sterile technique, left mandibular ostectomy was performed on five miniature pigs. The segment removed was 3 cm long and included the inferior border, mandibular canal and, in some cases, apices of a molar tooth.
Bone and plaster grafts (one solid and one canalized of each) were used to fill these defects. The fifth was left with no graft.
The objective was to learn the effect of each of these procedures on regeneration of the mandibular nerve across the defect. It was hypothesized that canals through the grafts would facilitate regeneration.
X-rays were taken periodically. The …
Kinetic Studies Of The Cell Elongation Phenomenon In Etiolated Pisum Stem Segments, Grant M. Barkley
Kinetic Studies Of The Cell Elongation Phenomenon In Etiolated Pisum Stem Segments, Grant M. Barkley
Masters Theses
The short-term growth response of etiolated pea stem segments (Pisum sativum L., var. Alaska) was investigated using a high-resolution growth recording device. The immediate effect of treatment with indoleacetic acid (IAA) is an inhibition of growth. This inhibition lasts about 10 minutes and then the rate of elongation rises abruptly to a new steady rate about 4 times the rate of elongation before auxin treatment. This rapid steady rate of elongation, however, continues for only about 22 minutes before declining suddenly to a lower steady rate of growth about 2 times the rate of elongation before the addition of auxin. …
The Effect Of Removing The Crevicular Epithelium Upon Canine Tooth Replantation, Leon A. Leonard
The Effect Of Removing The Crevicular Epithelium Upon Canine Tooth Replantation, Leon A. Leonard
Loma Linda University Electronic Theses, Dissertations & Projects
The nature of epithelium and the remarkable facility with which it aggressively covers granulation tissue, suggests that removal of the sulcular epithelium surrounding the extraction wound of a tooth to be replanted could promote reattachment of the periodontal tissues at a more nearly ideal coronal level. To investigate this hypothesis twenty mature teeth in five mongrel dogs were experimentally replanted. One half of them were replanted in alveoli around which the crevicular epithelium had been removed, the remaining teeth without creviculoectomy acting as controls. Animals were euthanized at one, two, three, five, and sixteen weeks. After clinical evaluation of the …
A Cephalometric, Anatomic And Histologic Investigation Of The Effects Resulting From A Heavy Interrupted Orthopedic Force To The Maxilla Of The Macaca Mulatta Monkey, Roger Wayne Triftshauser
A Cephalometric, Anatomic And Histologic Investigation Of The Effects Resulting From A Heavy Interrupted Orthopedic Force To The Maxilla Of The Macaca Mulatta Monkey, Roger Wayne Triftshauser
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study was to determine changes that occur in the craniofacial complex, when a heavy interrupted orthopedic force is employed to retract the maxilla in the post puberal rhesus monkey. Cephalometric, histologic and anatomic examinations were utilized to substantiate the findings.
Four female rhesus monkeys were used for experimentation. Two were experimental animals and the other two controls. Cervical retraction with headgear was applied over a period of 313 days and 159 days to the two experimental animals. Forces not exceeding 2.5 lbs. were found most effective.
The findings were as follows:-
- A total posterior displacement of …
Some Aspects Of Cranial Bone Growth In The Puberal Macaca Mulatta Monkey: As Evidenced By Metallic Implants And Cephalometric Roentgenography And The Application Of A Geological Lapidary Technique For The Semi-Serial Thin Sectioning Of Undecalcified Bone, Lee Eugene Olsen
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study was to investigate cranial and facial bone growth in the puberal Macaca mulatta monkey over a six month period utilizing the methods of metallic implantation combined with serial cephalometric roentgenography and a bichromatic vital staining method.
The employment of the vital stains, alizarin Red S and anthracene blue, over the six month period of the study, failed to stain the actively growing bone as evidenced by gross and microscopic analysis of the undecalcified bone preparations.
Interimplant measurements were made across certain bone sutures and the following results were obtained: The zygomaticotemporal sutures showed marked growth …
A Survey Of The Incidence Of Salmonellosis In Three Groups Of Wild Animals, James T. Heiberger
A Survey Of The Incidence Of Salmonellosis In Three Groups Of Wild Animals, James T. Heiberger
Masters Theses
No abstract provided.