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Results 651 - 700 of 785
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Verhoeff A P - - 1990
The aim of the first part of this study was to select the optimal technique for the enumeration and identification of viable mould propagules in the indoor air of houses. A comparison was made between the results obtained with six commercially available air sampling devices in combination with four culture ...
Kobayashi T - - 1990
Perilymphatic fistula is now widely recognized to cause acute profound hearing loss. It is still controversial, however, which mechanism it is that causes the reversible hearing loss. Recently, it has been suggested by two groups of researchers that the intrusion of air bubbles into the perilymphatic space (a condition called ...
Whyte W - - 1990
The bacterial dispersion rate of people wearing operating room clothing made from several types of polyester fabric was compared to conventional cotton clothing, total-body exhaust gowns and disposable clothing. Airborne bacteria were measured in a chamber, three ultra-clean air operating rooms and a conventionally ventilated operating room. The polyester clothing ...
Berwick J E - - 1990
Alveolar osteitis (dry socket) continues to be a frequent sequela of third molar surgery. Chlorhexidine 0.12% used as an oral rinse has been reported to reduce the incidence of dry socket. This study compares the effectiveness of 0.12% chlorhexidine used as a preoperative rinse and immediate postextraction irrigant with 1) ...
Matthews T G - - 1990
Forced-air heating and air conditioning (HAC) systems caused an average and maximum increase in air infiltration rates of 1.8- and 4.3-fold, respectively, during brief whole-house studies of tracer gas decay in 39 occupied houses. An average increase in air infiltration rate of 0.33 +/- 0.37 h-1 corresponded to an incremental ...
Kumar P - - 1990
Eight cars belonging to patients who were found to have exacerbation of allergic rhinitis and bronchial asthma after turning on the air conditioner in their cars were examined. Mold concentrations inside the passenger compartment with the a/c turned off and at different climate control settings were lower than concentrations in ...
al-Dagal M - - 1990
This article reviews the presence of microorganisms in air and their sources, the relation of airborne dust and endotoxin, the sources of atmospheric microbial contamination in food-processing plants, the mechanisms of airborne particle deposition, the importance of airborne microbes, the survival of microorganisms in air, methods of air sampling, airborne ...
Yager J W - - 1990
This study employed a longitudinal sampling design to obtain measurements of exposure and exhaled air from all members of a cohort several times over the course of one year. Styrene in exhaled air correlated well with styrene in breathing zone air. Both smoking and exposure to styrene appear to have ...
Dowding P - - 1990
Leafyeast populations were surveyed in 1987 and 1988 with the help of schoolchildren at 23 centres throughout Europe located at Brussels, Rochfort-Marche, Flobecq-Renaix and Tournai (Belgium); Aberdeen and Halifax (Britain); Lyon, Rouen and Toulouse (France); Hamburg, Koblenz and Stuttgart (Federal Republic of Germany); Banbridge, Belfast, Dublin and Enniskillen (Ireland); Hollenfels ...
Humphreys S H - - 1989
Manufacture of food products with desired texture and stability increasingly benefits from an understanding of the food microstructure. Freeze-fracture is advantageous in gaining this understanding because it avoids alterations of hydration, retains fat, and maximally preserves air cells. This paper reviews insightful applications of freeze-fracture to various food crystals, colloids, ...
Nguyen K B - - 1989
A simple staining technique for nervous tissue is described. Tissue perfused with glutaraldehyde and formaldehyde and postfixed with osmium tetroxide is embedded in glycol methacrylate. One-micrometer sections are stained with 0.05% cresyl fast violet aqueous solution at 60 C for 5 min, washed with tap water and air dried. With ...
Fischer S - - 1989
The influence of the smoking parameters (puff profile, puff duration, puff volume, puff frequency) on the delivery of tobacco-specific nitrosamines (TSNAs) in mainstream smoke was investigated for six different cigarette brands, including filter cigarettes with very low to medium smoke yields and non-filter cigarettes with high and very high smoke ...
Myers R L - - 1989
During the winter of 1987-88, 29 Anchorage residents who contacted various agencies with indoor air pollution inquiries had their homes inspected and monitored for several indoor air pollutants. A survey form was completed during an interview with occupants of each residence visited. Data were collected on house characteristics and behavior ...
Madelin T M - - 1989
1. Deep litter and raised netting flooring systems in broiler houses were compared for their effects on air quality and bird health during an 8-week growing period. 2. Weekly measurements were taken of respirable dust, numbers of airborne microorganisms and concentrations of gaseous pollutants. Airborne fungi and bacteria were identified ...
Davis R M - - 1989
The accessibility of seat belts was determined in a total sample of 200 taxicabs waiting to pick up passengers at eight city airports. A rear seat belt was "accessible" (able to be fastened within 10 seconds) in 111 (55.5 per cent) taxicabs. The proportion varied by city from 16.0 per ...
Soderholm S C - - 1989
Definitions are proposed for the inspirable (also called inhalable), thoracic and respirable fractions of airborne particles. Each definition is expressed as a sampling efficiency (S) which is a function of particle aerodynamic diameter (d) and specifies the fraction of the ambient concentration of airborne particles collected by an ideal sampler. ...
Kohyama N - - 1989
Airborne asbestos levels in non-occupational environments in Japan were determined by analytical transmission electron microscopy (ATEM) for about 100 air samples from various outdoor settings. Asbestos fibres (chrysotile) were found in almost all samples. The fibre (mass) concentrations were in the range of 4-367 fibres per litre (0.02-47.2 ng/m3) with ...
Tucker R D - - 1989
A simple circuit that demodulates the high-frequency output of an electrosurgical generator to proportional DC values can be employed to monitor generator voltage and electrosurgical current. An example of the use of the circuit in a urologic application is given. Employing this monitoring circuit, quantitative comparisons of electrosurgical equipment and ...
Sorainen E - - 1988
The vibration in nine halls of the six weaving mills was measured in 1978-80. The measurements were taken at regular intervals in the working area of the weavers, which was the wooden support attached to the machine or the floor of the textile mill. The accelerometer was mounted with screws ...
Edlich R F - - 1988
A new improved skin-closure tape, Proxi-Strip, has been developed. It has unique performance and handling characteristics that are ideally suited for wound closure. Most importantly, its adhesive provides a strong level of shear adherence to the skin. Its backing is extensive under low forces to accommodate swelling of the underlying ...
Iida T - - 1988
This paper describes a new type of electrostatic integrating 222Rn monitor designed for the environmental 222Rn monitoring. The window area of the monitor was selected to make the exchange rate optimal. The collecting electrode was positioned on the basis of calculating the internal electric field. A drying agent, P2O5, was ...
Radmore K - - 1988
From the total number of air-borne microorganisms present per m3 of air, 1.5% were found to contaminate a dairy product while being packed into a container with an opening of 100 cm2 if it was exposed for 60 s. This value was used to compile a proposed guideline of maximum ...
Cabrera H - - 1988
Evidence shows that the current national primary ambient air quality standard, if attained, would still permit substantial injury to vegetation. Thus, in March 1987, the California Air Resources Board (CARB) began consideration of the evidence for the effects of ozone (O3) on vegetation, and of several possible state ambient air ...
Virtanen T - - 1988
Samples of airborne particulate material were collected from 18 Finnish cowsheds both at stationary sites and in breathing zones. The concentrations of bovine epithelial antigen (BEA) in samples were analyzed by the immunochemical enzyme-linked immunosorbent assay (ELISA) inhibition test. For total dust and BEA measurements the range of results among ...
Papastefanou C - - 1987
The aerodynamic size distributions of short-lived Rn daughters (reported as 214Pb and 212Pb) in ambient aerosol particles were measured using low-pressure as well as conventional low-volume and high-volume impactors. The activity distribution of 214Pb and 212Pb, measured by alpha spectroscopy, was largely associated with submicron aerosols in the accumulation mode ...
Rice D A - - 1987
The time it takes audible sound to travel from the trachea to the pleura in five intact, excised horse lungs and one dog lung inflated with several gases was measured. Regression estimates of sound speed at total lung capacity (TLC) using straight line distance from the carina to the pleura ...
Lebowitz M D - - 1987
A time series analysis was utilized to evaluate respiratory responses to outdoor and indoor air pollutant and aeroallergen exposures in potentially sensitive adults in a dry arid environment. Daily symptoms and peak flows were recorded in populations of asthmatics, allergic individuals, those with chronic lung disease symptoms, and asymptomatic individuals ...
Sato T B - - 1987
A survey was made of car crashes in Japan of injuries to seat belt users compared to nonusers. The purpose of the study was to clarify the relationship between the types of injuries and the way the belts were used at the time of the crash. Eight hundred individuals were ...
Johnston A M - - 1987
An experimental investigation has been conducted into the effects of electrostatic charge, carried by the dust particles and by the sampler itself, on the sampling of airborne dusts. Experiments covering both personal and static sampling and a range of sampler types were carried out in the laboratory for both fibrous ...
Navarro P L - - 1987
100 residents of Santiago de Chile took part in a study of the relationship among locus of control, trait-anxiety, and perception of air pollution. Concern over the problem of atmospheric pollution and number of antipollution measures taken was related to trait-anxiety. Locus of control was associated with variation in awareness ...
Evans L - - 1987
This work was performed to determine relations between car mass and driver injuries (serious or fatal) when cars of similar mass crash into each other head-on. This type of crash is examined because it is considered similar in some respects to a barrier crash. Data from the United States Fatal ...
Jurberg P - - 1987
Using three columns of different depths (1.10m, 8.40m and 10.40m), we investigated the possibility of Biomphalaria glabrata moving towards deep regions. In the 1.10m column, we noted that locomotion can occur in two manners: 1) when the foot is in contact with the substrate: a) sliding descent; b) sliding ascent; ...
Ward C A - - 1987
The consequences of complement activation and the symptoms of decompression sickness are similar. Consequently, the relation between the sensitivity of individuals to complement activation by air bubbles and their susceptibility to decompression sickness has been examined. Plasma samples from 34 individuals were incubated with air bubbles, and the concentration of ...
O'Brien D - - 1987
High speed grinding of gray iron castings long has been associated with excessive exposure to crystalline silica. Not all workers engaged in these operations are protected by conventional ventilation techniques. Dust in the air that has been entrained by the spinning grinding wheel and not captured in the grinder hood ...
Hurtado I - - 1987
Air sampling studies carried out in Caracas. Venezuela indicate that in this tropical area pollen and fungus spores of allergenic potential are airborne throughout the year. The pollen grains of conifers, mulberry and grasses are the most frequently encountered. Many more fungus spores than pollen grains are recovered from the ...
Wassersug R J - - 1987
Xenopus laevis tadpoles are midwater suspension-feeders that use buccopharyngeal surfaces for both food capture and aquatic respiration, but also have functioning lungs well before metamorphosis. To examine the effect of aerial respiration on premetamorphic growth and development in this species, tadpoles were raised in normoxic water for from one to ...
Dang H S - - 1986
Thorium intake by an urban group (Bombay) has been estimated using neutron activation followed by simple chemical separation. Daily intake of thorium via all the three sources: food, water and air, is reported in this paper. The major contribution of thorium to intake is through food (2.0 micrograms), followed by ...
Wang J C - - 1986
Results of an anthralin stain removal study on white 65% polyester/35% cotton, white 100% polyester, white 100% cotton, a white shower curtain, white tile with crevice, and white ceramic shower tile are reported. An optimum stain removal technic was developed by using a 10-minute soak in full-strength chlorine bleach (Good ...
Goh C L - - 1986
This is a study on atmospheric concentration of total chromium and hexavalent chromate and its role in chromate sensitivity. Air concentration of total chromium and hexavalent chromate in a construction factory, a busy city area, a suburban area, a residential area, and a heavy industrial area were measured by air ...
Garrow J S - - 1986
An indirect calorimeter is described with which it is possible to make recordings of oxygen uptake, carbon dioxide production and respiratory quotient in one or two subjects simultaneously. The gas analysers sample expired air from the two patients and room air in a continuous cycle which lasts 15 min; a ...
Schulte E - - 1986
The effect of air-drying on cytological material is investigated in this article. Smears of rat liver were fixed completely wet and, after air drying, postfixed in ethanol, methanol/formaldehyde/acetic acid (MFA), and formaldehyde. Staining was performed with the thionin-Feulgen procedure, a standard Romanowsky-Giemsa stain with azure B-eosin Y and a Papanicolaou ...
Lamb B K - - 1986
The rooftop air intakes are in close proximity to the fume hood exhaust vents on the roof of the attached chemistry buildings (Fulmer Hall and Fulmer Annex) at Washington State University. Complaints resulted from the apparent re-entry of hazardous and odorous exhaust vapors and gases returning into the building fresh ...
Tremblay J - - 1986
Particulate guanylate cyclase from bovine adrenal cortex can be stimulated by ANF. A 2-fold stimulation of the enzyme was obtained with 100 nM ANF and a half-maximal stimulation, with a 5 nM dose. The stimulation by ANF persisted for at least 30 min. Various detergents, such as Triton X-100, Lubrol ...
Sánchez-Marroquín A - - 1985
The different milling characteristics of Amaranthus cruentus, a domestic variety prevailing in Mexico, selected as representative sample, are herein discussed. This was subjected to proximate analysis, which confirmed its good quality. Milling trials were carried out for the preparation of whole flour by means of conventional mills and by combining ...
Mullins H E - - 1985
A method is described for the collection and determination of ethylene oxide in air below the 1 ppm level. A passive diffusion-type monitor adsorbs the contaminant on a treated charcoal disc and converts it to 2-bromoethanol. This compound is then desorbed, injected into a gas chromatograph, and evaluated by electron ...
Ogino M - - 1985
The moisture-conserving efficiency of commercially available condenser humidifiers (small, disposable, airway humidifiers) was studied. A comprehensive comparison of all currently available condenser humidifiers utilising a laboratory system which simulated a breathing, intubated patient in temperature, humidity, dead space, and respiratory pattern characteristics was undertaken. The percentage of moisture conserved, or ...
Anthony W S - - 1985
The influence of processing machinery at cotton gins on the respirable dust that is emitted into the gin environment and the respirable dust that remains in ginned lint was investigated during a 3-year study. Dust levels in the air near positions occupied by human operators ranged from 94 to 1251 ...
Line S J - - 1985
A modification of the direct air displacement system of processing laboratory discard material in an autoclave is described. The method overcomes many of the drawbacks encountered previously with existing laboratory sterilizers and yet provides an effective means of replacing air with steam in difficult laboratory discard loads. Plastic Petri dishes ...
Cheng Y S - - 1985
Compressed air-powered jet mills are used in the chemical and food industries for grinding and classifying powders. We adapted one type of these fluid energy mills as a powder generator for inhalation experiments. The generating system included a jet mill and a screw feeder, the jet mill consisting of an ...
Yamasaki K - - 1985
A aspiration pneumonia caused in 3 female mice by food inhalation was examined histopathologically. Dark-red areas were observed macroscopically on the uncut lungs. The change was more severe in the superior and post-caval lobes of the right lung and the anterior part of the left lung. Microscopic examination revealed various-sized ...
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