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Results 451 - 500 of 1022
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Saito T - - 1998
By using a Mach-Zehnder interferometer, we evaluated photosensitivity in silica-based waveguides deposited by atmospheric pressure vapor deposition. Our results show that photosensitivity with ArF excimer laser irradiation was ten times greater than photosensitivity with KrF excimer laser irradiation. ArF excimer laser irradiation induced a refractive-index change of greater than 2 ...
Shuke N - - 1998
A 19-year-old man with a double-chambered right ventricle (DCRV) and an associated ventricular septal defect was admitted to the hospital for surgical correction. Preoperative study of myocardial perfusion with Tc-99m tetrofosmin SPECT depicted the two chambers of the right ventricle. There was a substantial differential in the radioactive uptake between ...
Meningaud J P - - 1998
OBJECTIVE: The purpose of this study was to investigate the popular belief that the incidence of odontogenic cellulitis is weather-related. Two meteorologic parameters were examined: temperature and atmospheric pressure. STUDY DESIGN: To test the hypothesis being studied, a retrospective cohort study design was used. Medical reports of all patients with ...
Vouyouka A G - - 1998
Many studies over the last decade have indicated that circulatory forces such as shear stress and cyclic strain can influence the endothelial cell (EC) phenotype. However, very little is known about the in vitro effects of pressure on EC. To study this, cultured bovine aortic EC were grown in custom ...
Järvinen P - - 1998
This study attempted to determine whether cold box core makers exposed to triethylamine in foundries experienced headaches or had elevated blood pressure more often than workers without TEA exposure, as proposed by earlier reports. Forty-one core makers in three foundries and 82 referents were interviewed according to a structured questionnaire, ...
Sakairi M - - 1998
We describe the structure of a multi-atmospheric pressure ionisation (multi-API) interface for liquid chromatography-mass spectrometry (LC-MS). This interface includes five modes of atmospheric pressure spray with electron impact ionisation (APEI), atmospheric pressure chemical ionisation (APCI), atmospheric pressure spray ionisation (APSI), electrospray ionisation (ESI) and sonic spray ionisation (SSI). This LC-MS ...
Omae T - - 1998
BACKGROUND AND PURPOSE: There are several reports that have studied the effects of hyperbaric oxygen (HBO) on cerebral blood flow (CBF). However, most of the reports have been of animal experiments, and human studies are few so far. The aim of this study is to clarify the relationship between HBO ...
Nuytten P - - 1998
Manned submersibles and atmospheric diving suits share a number of characteristics, with the most obvious being the rigid hull structure required to maintain a one-atmosphere cabin pressure in the presence of high external pressures. The rigid pressure hull results in a fixed internal volume that allow a simple, mechanical means ...
McEwan C E - - 1998
The genomic GC contents of both nitrogen-fixing and non-fixing members of eight genera of bacteria are investigated. Analysis by t-tests showed that in the two aerobic general investigated (Aquaspirillum and Vibrio) there is a significantly higher GC content in the nitrogen-fixing members of the genus than in those unable to ...
Lillo R S - - 1998
These experiments examined whether increasing the partial pressure of oxygen (PO2), hydrostatic pressure, or both were responsible for the improvement in effectiveness of recompression treatment previously observed in guinea pigs with increasing depths of air. Unanesthetized male guinea pigs (600-700 g) were subjected to 8.6 atm abs (871 kPa) air ...
Taylor W F - - 1998
In vitro studies have shown that mild pressure increases red blood cell (RBC) aggregation. Enhanced RBC aggregation in pathologic states can drive the circulation into stasis. This investigation examined the effects of pressure on RBC aggregation in human volunteers. The hypothesis tested is that RBC aggregation is increased during hyperbaric ...
Balestra C - - 1998
Scuba divers with patent foramen ovale (PFO) may be at risk for paradoxical nitrogen gas emboli when performing maneuvers that cause a rebound blood loading to the right atrium. We measured the rise and fall in intrathoracic pressure (ITP) during various maneuvers in 15 divers. The tests were standard isometric ...
Djurhuus R - - 1998
Saturation diving involves the exposure of humans to elevated partial pressure of oxygen (PO2) and high ambient pressure. The present study is part of a research program that focuses on how such conditions affect basal cellular functions. C3H/10T1/2 Cl 8 mouse embryo fibroblasts were exposed to 20-80 kPa O2 in ...
Kernbach-Wighton G - - 1998
A 24-year-old student died while filling flasks with liquid nitrogen. The arms, legs and back were frozen and the face, ears and neck showed a dark red and livid colour with horizontal lines of demarcation. In the electrocardiogram, the heart showed asystolia followed by wide ventricular complexes. The patient was ...
Reinertsen R E - - 1998
Reduction in ascent speed and an increase in the O2 tension in the inspired air have been used to reduce the risk for decompression sickness. It has previously been reported that decompression speed and O2 partial pressure are linearly related for human decompressions from saturation hyperbaric exposures. The constant of ...
Mennel H D - - 1997
HPNS (high pressure neurological syndrome) is considered to be reversible condition of the nervous system caused by elevated (atmospheric) pressure. Clinical observations and experimental findings gave rise to the belief that this syndrome at least partly functions as a model of a dopamin dependent psychosis. Morphological alterations during or after ...
Tokumaru O - - 1997
Extended and more frequent extravehicular activity (EVA) is planned in NASA's future space programs. The more EVAs are conducted, the higher the incidence of decompression sickness (DCS) that is anticipated. Since Japan is also promoting the Space Station Freedom project with NASA, DCS during EVA will be an inevitable complication. ...
Darbin O - - 1997
High pressure is known as a basic etiological factor underlying central nervous system changes known as the high pressure neurological syndrome (HPNS). In the rat, HPNS includes behavioural disturbances including locomotor and motor hyperactivities (LMA) linked to a striatal dopamine (DA) increase. Recent findings have shown that intracerebroventricular administration of ...
Sato S - - 1997
Experimental middle ear barotrauma was studied morphologically. White guinea pigs were placed in an experimental hyperbaric chamber, and middle ear barotrauma was created by increasing the pressure in the hyperbaric chamber from 1 atmosphere absolute (ATA) to 2 ATA using pure oxygen, maintaining the pressure at 2 ATA for 10 ...
Ferrigno M - - 1997
Electrocardiogram, cardiac output, and blood lactate accumulation were recorded in three elite breath-hold divers diving to 40-55 m in a pressure chamber in thermoneutral (35 degrees C) or cool (25 degrees C) water. In two of the divers, invasive recordings of arterial blood pressure were also obtained during dives to ...
Guerrero F - - 1997
The aim of this study was to investigate the effects of a high ambient pressure of He on vascular contraction induced by noradrenaline and to distinguish the effects of ambient pressure per se from those of increased pressure of inert gas. Rings of thoracic aorta were isolated from male Wistar ...
Abraini J H - - 1997
The psychomotor and cognitive abilities of experienced professional divers participating in training and experimental dives in a hyperbaric chamber were investigated during experiments at high ambient pressure of either air or hydrogen-helium-nitrogen-oxygen mixtures. Decrements in psychomotor ability were not as large as decrements in cognitive ability: manual dexterity was 2-16%, ...
Gomaa M N - - 1997
Ammoniation represents the best technique to detoxify aflatoxin-contaminated grain and it is considered as economically practicable for commercial applications. In the present studyAspergillus parasiticus was used to contaminate yellow corn to produce the final concentration reached 4000 μg/kg corn total aflatoxin. Two procedures of ammoniation (in aqueous ammonia concentrations, 0.25, ...
Kayar S R - - 1997
We analyzed O2 pulse, the total volume of O2 consumed per heart beat, in guinea pigs at pressures from 10 to 60 atmospheres. Animals were placed in a hyperbaric chamber and breathed 2% O2 in either helium (heliox) or hydrogen (hydrox). Oxygen consumption rate (VO2) was measured by gas chromatographic ...
Watase M - - 1997
Recent studies indicate that smooth muscle cell (SMC) growth and morphology can be modulated by repetitive strain. However, there is very little known about the influence of pressure, without an associated cell stretch, on SMC phenotype. To study this, cultured bovine aortic SMC were grown on a rigid surface and ...
Jauchem J R - - 1997
These experiments were designed to investigate the effects of sub-resonant microwave (MW) exposure (350 MHz, E orientation, average power density 38 mW/cm2, average whole-body specific absorption rate 13.2 W/kg) on selected physiological parameters. The increase in peripheral body temperature during 350 MHz exposure was greater than that in earlier experiments ...
Boussuges A - - 1997
Since the 1960s, decompression illness after breath-hold diving has been widely debated. The aim of this study was to detect circulating bubbles after breath-hold diving in underwater fishing divers. We used continuous Doppler (DUG, COMEX Pro) and transthoracic two-dimensional (2D) echocardiography (Kontron Sigma 1). This study was conducted during a ...
Iwabuchi K - - 1996
The effect of vapor pressure deficit (VPD) of air during photoperiod on spinach growth under low total pressure was examined. Spinach plants grown under atmospheric pressure were transplanted into a pressure-reduced growth chamber and cultured hydroponically for eight days. The air temperature in the growth chamber was kept at 25 ...
Winter W C - - 1996
The purpose of this study was to test whether pressure in tissue lateral to the upper airway, the lateral pharyngeal fat pad, differs from atmospheric and pharyngeal pressure and whether it changes with breathing. We studied five male pigs by inserting a transducer-tipped catheter into their fat pad space using ...
Chen F Y - - 1996
BACKGROUND: To investigate the theory of decreased myocardial oxygen consumption (MVo2) in dynamic cardiomyoplasty (DCM), previous studies have calculated indices of MVo2 in DCM. These previous studies, however, used left ventricular pressure in formulas that assumed the assumed the heart to be in its native state, with the reference pressure ...
Besch S R - - 1996
A 100-microliters chamber has been developed to facilitate the use of optical techniques for the study of living cells under conditions of high hydrostatic pressure and other environmental manipulations. The chamber attaches to the mechanical stage of an inverted microscope and is capable of sustaining cells under physiologic conditions over ...
Wu T N - - 1996
BACKGROUND: To assess the relation between occupational lead exposure and elevated blood pressure with consideration of a possible confounding effect by noise exposure. MATERIALS AND METHOD: Some 112 male and 110 female workers at two lead battery manufacturing factories were recruited for this 1992 study in Taiwan. Study participants received ...
Shimada H - - 1996
A transportable hyperbaric chamber called the Gamow bag has been reported as an effective means of treating high-altitude illness. The pressure limit of the original bag is set at 2 psi because of the fragility of the fabric. However, improvement of the hardware to make the bag capable of withstanding ...
Higgins T F TF - - 1996
A 2-year-old male was found unresponsive approximately 40 min after oral exposure to butyrolactone (Figure 1), a solvent used to remove methacrylate glues. The patient was apneic, bradycardic, and flaccid. He was given atropine and orally intubated, and his heart rate increased and blood pressure remained normal. He remained unresponsive ...
Abrams M C - - 1996
A method for retrieving the atmospheric pressure corresponding to the tangent point of an infrared spectrum recorded in the solar occultation mode is described and applied to measurements made by the Atmospheric Trace Molecule Spectroscopy (ATMOS) Fourier-transform spectrometer. Tangent pressure values are inferred from measurements of isolated CO(2) lines with ...
Nyklícek I - - 1996
A review of the literature on the relationship between blood pressure and stressor exposure revealed a discrepancy between the results of studies based on objective measures of stressor exposure and studies based on self-reports. Whereas in the studies based on objective measures, a clear predominance of positive associations between blood ...
Skogstad M - - 1996
We have studied pulmonary function before and 2 h after open sea dives to 10 and 50 m and 24 h after the dive to 10 m. Nine trainee divers participated in the dive to 10 m and 17 in the dive to 50 m. Mean time in water was ...
Young R E - - 1996
The Galileo probe performed the first in situ measurements of the atmosphere of Jupiter on 7 December 1995. The probe returned data until it reached a depth corresponding to an atmospheric pressure of approximately 24 bars. This report presents a brief overview of the origins and purpose of the mission. ...
Ragent B - - 1996
The nephelometer experiment carried on the Galileo probe was designed to measure the jovian cloud structure and its microphysical characteristics from entry down to atmospheric pressure levels greater than 10 bars. Before this mission there was no direct evidence for the existence of the clouds below the uppermost cloud layer, ...
Byrne D E - - 1996
Respiratory sinus arrhythmia (RSA) has been used as a non-invasive estimate of vagal tone to determine whether the reduction in resting heart rate commonly seen when humans are exposed to increases in the ambient pressure is associated with changes in vagal autonomic control. Two sets of divers (n = 4) ...
Noller K L - - 1996
OBJECTIVE: Our purpose was to determine whether there is a relationship between changes in atmospheric pressure and spontaneous onset of labor in term pregnancy. STUDY DESIGN: All women admitted to Medical Center of Central Massachusetts-Memorial Hospital with spontaneous onset of labor at term and who were delivered on the service ...
Kriem B - - 1996
When human divers and experimental animals are exposed to increasing environmental pressure, they develop the high-pressure neurologic syndrome (HPNS) that has been recently demonstrated to include an increase in striatal dopamine (DA) release. This increase has been correlated with enhanced locomotor and motor activity (LMA). In the present study, we ...
Barshtein G - - 1996
Application of hydrostatic pressure of several atmospheres (atm), such as that applied in diving or hyperbaric treatment, has been previously shown to induce the release of membrane components into the extracellular medium. As the shape of red blood cells (RBC) is sensitive to membrane composition, this might imply a subsequent ...
Nuckols M L - - 1996
Closed circuit rebreathers used by divers recirculate the respiratory gases through a scrubber to remove exhaled carbon dioxide. For systems used in deep diving applications, oxygen is mixed with a diluent gas to maintain a preset partial pressure of oxygen (PO2) that is within the physiologically acceptable limits for the ...
Rye R - - 1995
The composition of the Earth's early atmosphere is a subject of continuing debate. In particular, it has been suggested that elevated concentrations of atmospheric carbon dioxide would have been necessary to maintain normal surface temperatures in the face of lower solar luminosity in early Earth history. Fossil weathering profiles, known ...
Yano Y - - 1995
The intestinal floras of seven deep-sea fish retrieved at depths of from 3,200 to 5,900 m were examined for population sizes and growth responses to pressure. Large populations of culturable bacteria, ranging from 1.1 x 10(sup6) to 3.6 x 10(sup8) cells per ml of contents, were detected when samples were ...
Abraini J H - - 1995
Psychotic-like episodes in divers exposed to high pressure have been attributed to either the high-pressure neurological syndrome, confinement in pressure chamber, the subject's personality, or the addition of nitrogen or hydrogen to the basic helium-oxygen breathing mixture used for deep diving. Alternatively, it is suggested that these disorders are in ...
Santos F X - - 1995
We analyze the repercussions of air evacuation on the physiopathology of the critically burned patient based on the experience on 63 patients evacuated by air. Clinical repercussions are due to accelerations, vibrations, noise, and, primarily, to altitude. Accelerations are important during take-off and landing, and vibrations may be important in ...
Kieffer S W - - 1995
Volcanic eruptions of gassy magmas on Earth, Venus, and Mars produce plumes with markedly different fluid dynamics regimes. In large part the differences are caused by the differing atmospheric pressures and ratios of volcanic vent pressure to atmospheric pressure. For each of these planets, numerical simulations of an eruption of ...
Lysfjord J P - - 1995
Barrier isolators that enclose aseptic filling equipment are being proposed as a means of: (1) assisting in achieving a 10(-6) sterility assurance level (SAL) in the filling area and (2) minimizing the clean environment required in the manufacturing area. The need for operator and maintenance access to the interior of ...
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