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Results 301 - 350 of 369
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Davis D E - - 1991
1. Zeitgebers for circannual rhythms have been elusive. Demonstration that an external factor is a zeitgeber requires proof of a phase-shift that endures for several years. 2. The California ground squirrel (Spermophilus beecheyi) is an ideal subject. Many features of behavior have circannual rhythms of which change in mass is ...
Swallow A J - - 1991
Irradiation with gamma-rays, X-rays or fast electrons can be used to change foodstuffs in beneficial ways or to destroy harmful organisms. Gamma rays do not induce radioactivity in foods, but X-rays and fast electrons can induce short lived radioactivity if sufficiently energetic. This imposes limitations on the energies which can ...
Autio T - - 1990
This investigation assessed the radiation-induced thermoluminescence (TL) of food minerals for identifying irradiated foods. Mineral contamination, rather than the inherent mineral content, of foods was studied. Positive identification of foods given 1-10-kGy doses depends on the contents and composition of the mineral contamination and the time span between irradiation and ...
Biyani A - - 1990
P.A. radiographs of both wrists were taken in 400 normal individuals to study the configuration of the styloid process of the ulna. Five different morphological variations were noticed, the commonest being an elongated process (102 wrists). Medially deviated (41 wrists), parrot beaked (27 wrists) and hypertrophic (16 wrists) patterns were ...
Modi N K - - 1990
The effects of irradiation and temperature on purified staphylococcal enterotoxin A were investigated using sensitive ELISA systems. Thermal inactivation of staphylococcal enterotoxin A in phosphate-buffered saline was considerably faster at temperatures of 60, 70, 115 and 121 degrees C than at 90 and 100 degrees C. In gelatin phosphate buffer, ...
Komatsu K - - 1990
Tritium incorporated into tissues and DNA of mice was studied after daily ingestion of tritiated food or tritiated water. The tritiated food used was a commercial preparation mixed with brine shrimp that had been reared in tritiated sea water. After ingestion of tritiated food or water for up to 22 ...
Viegas S F - - 1990
An experimental model that uses a static positioning frame, pressure-sensitive film, and a microcomputer-based videodigitizing system was used to measure the contact areas and pressures in a group of wrists in their "normal" state, after ligament sectioning, which resulted in stage III perilunate instability and then following different types of ...
Heide L - - 1990
The response to ionizing radiation of thermoluminescence, chemiluminescence and viscosity of food was measured, and many specimens could be clearly distinguished from unirradiated samples up to several months after irradiation. Examples are given which show how to use the methods routinely for the purpose of food control. The results are ...
Cronin K - - 1989
Argyrophilic nucleolar organiser regions (AgNORs) in 28 follicular lymphomas and 30 lymph nodes showing reactive follicular hyperplasia were studied to see if they were helpful in distinguishing follicular lymphoma from follicular hyperplasia in paraffin wax tissue sections. Mean nuclear counts were greater in follicular hyperplasia (3.71 v 3.11). This difference ...
Russell R W - - 1989
Experiments were conducted to determine the effectiveness of urea in deactivating tannin in high tannin milo. High tannin milo (Pioneer B 815, 3.4 +/- .3% tannin) was reconstituted with aqueous urea solutions to give combinations of 26, 30, and 34% moisture with 2, 3, and 4% urea (percentage of urea ...
Glicenstein L J - - 1989
Using safranin O as a fluorescent stain at a wavelength range of 355-425 nm has allowed us to distinguish the transmitting tissue and the nature of this tissue in pistils of members of the Geraniaceae and Gentianaceae. Xylem, amyloplasts, and high tannin containing tissues, such as mericarp walls, were also ...
Farkas J - - 1989
This paper attempts to summarize relevant information on microbiological safety of irradiated foods in the light of previous reports of expert committees and current literature references. After a brief survey of the relative radiation resistance of food-borne microorganisms, the importance of microbial load for dose requirement, and the role of ...
Karel M - - 1989
What needs to be done to establish food irradiation on a truly commercial basis so that those living on planet Earth can fully realize the benefits of this versatile process? This question is answered in the first part of this paper. The second part covers the potential contributions of irradiated ...
Nevo E - - 1989
We report on kidney structure and function in subterranean mammals of four chromosomal species (2n=52, 54, 58 and 60) belonging to the Spalax ehrenbergi superspecies, in relation to their speciation and adaptive radiation from mesic (2n=52) to xeric (2n=60) environments in Israel. Structural variables measured involved: (1) Relative Medullary Thickness, ...
Yin D - - 1989
Eight trials, with 439 human volunteers who consumed irradiated foods including rice, potatoes, mushrooms, peanuts, and Chinese sausages, as well as diets composed of multiple irradiated foods (irradiated at dosages of 0.2 to 8 kGy) that accounted for 60-66% of the entire diet, were carried out for 2-3 months according ...
Harris M G - - 1989
We evaluated the effectiveness and convenience of microwave irradiation as a method of disinfecting soft contact lenses. Soft contact lenses from each of the four Food and Drug Administration (FDA) categories were placed in sterile vials and immersed in 2 ml of saline which had been contaminated with one of ...
Beauduin M - - 1989
Relative biological effectiveness (RBE) and oxygen enhancement ratio (OER) values of different neutron beams produced at the variable energy cyclotron "Cyclone" of Louvain-la-Neuve (Belgium) were determined. The neutrons were obtained by bombarding a beryllium target with 34-, 45-, 65-, or 75-MeV protons or with 50-MeV deuterons. The biological system was ...
Dodd N J - - 1989
Previous work has shown that the calcified tissues in several foods give rise to characteristic ESR spectra on irradiation. Further foods have now been examined. Mussel and crab shells give large signals, compared with bones of poultry, beef or frog, while prawn cuticle gives a smaller signal. The limits of ...
Ohashi Y - - 1989
We have examined the function and fine structure of the mucociliary system of the eustachian tube in an experimental study of otitis media with effusion induced by X-ray irradiation. Functional examination demonstrated that the ciliary activity was diminished in such a condition, while morphological observations showed pathological findings including compound ...
Jésior J C - - 1989
Low-angle diamond knives, one of them with an angle as low as 14.6 degrees, have been tested to measure compression induced during the sectioning of polystyrene latex spheres embedded in epoxy resins. Compression diminishes roughly proportional to the sectioning angle (sum of knife and clearance angles). The beneficial application of ...
Sigurbjörnsson B - - 1989
After more than four decades of research and development, food irradiation has been demonstrated to be safe, effective and versatile as a process of food preservation, decontamination or disinfection. Its various applications cover: inhibition of sprouting of root crops; insect disinfestation of stored products, fresh and dried food; shelf-life extension ...
Alviso D J - - 1988
The purpose of this study was to examine intertester reliability using a method of measuring the relaxed standing pelvic-tilt angle, active anterior and posterior pelvic-tilt angles and ranges of motion, and the total pelvic-tilt ROM in the sagittal plane. After an instructional session, 6 testers measured the pelvic-tilt angles of ...
Rogan A - - 1988
Despite the limited use of irradiation for food preservation in the United States to date, the process provides an alternative to the use of some chemical pesticides and sprout inhibitors. The formation of random and varied radiolytic products (RPs) in foods that have been irradiated is the focus of criticism ...
Preston F S - - 1988
Food poisoning from contaminated airline food can produce serious consequences for airline crew and passengers and can hazard flight. While irradiation of certain foodstuffs has been practised in a number of countries for some years, application of the process has not been made to complete meals. This paper considers the ...
Mudgett R - - 1988
The use of electromagnetic energy in food processing is reviewed with respect to food safety, nutritional quality, and organoleptic quality. The effects of nonionizing radiation sources such as microwave and radio-frequency energy and ionizing radiation sources, e.g. radioactive cobalt-60 and caesium-137, on the inactivation of microbes and nutrients are compared ...
Lindh T - - 1988
Two instruments, an EFEM meter and a BE-log meter, have been tested on people working in switchyards for voltages between 70 kV and 400 kV. The results from the BE-log meter correlate well with the short circuit currents through people connected to the ground. The EFEM meter showed lower measured ...
McGivney W T - - 1988
The use of irradiation to preserve food has the potential to significantly enhance our capacity to maximize the quality and quantity of the food we consume. In a world in which distribution of food occurs across continents and in which malnourished populations are in dire need of basic food products, ...
Cunningham W C - - 1987
The capabilities of a relatively simple instrumental neutron activation analysis procedure were demonstrated by performing multielement analyses of 240 Food and Drug Administration Total Diet Studies food composites. The analytical results provide a comprehensive database for a wide range of food types. The procedure incorporates only two irradiations and counts, ...
Zweit J - - 1987
The excitation functions for the production of 66Ga and some other radionuclides produced by the 4He-particle bombardment of a natural copper target have been measured up to 31 MeV incident energy. The radiochemical separation of 66Ga from the irradiated copper target as well as from the other radionuclides formed is ...
Dershaw D D - - 1986
Mammography without a grid and with both a stationary and a moving grid was performed on 46 women. Mean gland dose to the breast was increased two to four times using either grid. Grid lines were apparent on films obtained with a stationary grid, but were not seen on those ...
Bork U - - 1986
Irradiation of dry seeds of Arabidopsis with heavy ions (HZE-particles) produced by UNILAC-accelerator (GSI, Darmstadt) yielded aberrations in varied developmental endpoints such as survival rate and embryo vitality. The damage increased with particle density and charge. Cross sections in the range of 0.2-1.0 micrometer2 for Ne and Ar and 2.0-10.0 ...
Sørensen A - - 1985
A pilot study was carried out to establish techniques and procedures for the measurement of indoor radiation in Denmark. A passive cup dosemeter was designed containing CR39 track detectors and TLD's to measure radon and external radiation, respectively. A total of 82 dwellings were selected covering most regions of the ...
Bettencourt A O - - 1985
A radiological assessment has been in progress, since 1978, on the environmental implications of an abandoned radium salts factory, operating in Portugal from 1912 to 1944. Some aspects of the study performed at the site are briefly described. They include the analysis of radium-226 concentrations in water and foodstuff and ...
Izmerov N F - - 1985
Electromagnetic radiation in the radiofrequency range is the most common type of nonionizing radiation. The accelerated development in telecommunications and the introduction of power transmission lines, as well as glue drying and plastic heating in the wood and plastic industries, cause both occupational and nonoccupational systematic exposure to electromagnetic radiation ...
Shostak G S - - 1985
In August, 1981, the Westerbork Synthesis Radio Telescope was used for 4 h to search for narrowband pulsing radio beacons in the direction of the Galactic Center. By using both the spatial discrimination and temporal stability available to an interferometric measurement, weak intermittent signals can be detected even in the ...
Karawya M S - - 1984
Diphenylamine has been isolated as one of the active antihyperglycemic agents of onion. It was identified by ir, uv, cmr, pmr, and mass spectra. It attained the highest percentage in mature onion bulbs; other onion organs contained diphenylamine in lower percentages. Green and black teas were found to contain relatively ...
Robson A - - 1984
Radiological impact is discussed for U.K. coal and nuclear power cycles under normal operation. The type having the greater impact depends on the radiological basis of the comparison, the particular nuclear reactor system considered and whether or not the whole fuel cycle, especially irradiated nuclear fule reprocessing , is included ...
Thomas P - - 1984
In Part 1 of a planned series of articles on preservation of foods of plant origin by gamma irradiation, the current state of research on the technological, nutritional, and biochemical aspects of sprout inhibition of potatoes and other tuber crops are reviewed. These include varietal responses, dose effects, time of ...
Pietrzak-Flis Z - - 1984
Rats were continuously exposed to constant activity of tritium in drinking water (HTO group) or to tritium organically bound in food (T-food group) in the period from conception of F1 generation through maturity. Female offspring were killed at the age of 21 and 71 days and the oocytes in their ...
Campbell G L - - 1983
A study was undertaken with chickens to determine the effect of irradiation treatment on the viscosity-inducing properties of polysaccharide components of rye. Three-week body weight, food utilisation, fat retention, and bone ash of chicks were substantially improved by irradiating rye (0 to 10 Mrad) and were maximal at 6 Mrad. ...
Väyrynen T - - 1983
Different mathematical formulas capable of replacing CRE have been analyzed. The purpose was to develop an expression which would yield a value identical with CRE for regular treatment schedules, but would represent more clearly and more truthfully the radiation damage of tissue. This quantity has been called cumulative radiation damage ...
Masefield J - - 1983
Successful commercial radiation applications are analyzed, and an evaluation is made of those factors present in each which led to its success. Common "success elements" were identified. Several potential food irradiation applications were then examined from that viewpoint, and some applications could be identified which appeared to contain those favorable ...
Kozubík A - - 1982
The effect of 1 to 6 weeks' adaptation to intermittent fasting (alternating periods of 24 h fasting and subsequent 24 h feeding) on the manifestations of radioresistance of mice subjected to whole-body gamma-irradiation was studied. A favourable effect of this feeding regimen on the survival of irradiated animals was observed. ...
Puite K J - - 1982
This is the second part of a review dealing with the development and current state-of-the-art of lyoluminescence dosimetry. Readout equipment described in the review covers a range of devices from simple manually-operated apparatus to semi-automatic machines suitable for loose powders and for encapsulated dosimeters. The survey of dosimetric properties of ...
Gammage R B - - 1982
Voltage gradient and frequency were studied for their influence on the electrochemical etching of CR-39 plastic irradiated with fission spectrum, fast neutrons. A power supply having outputs of up to 1.5 kV (rms) and 5 kHz was used. Differential voltage measurements under non-etching conditions indicated that the optimal values in ...
Bonner W A - - 1982
D- and L-Leucine have been subjected to 39-55 percent radiolysis using 0-11 MeV protons, both with the proton beam passing through the sample or being absorbed by it, and with quenching the sample immediately on completion of irradiation or after a 21-day interval. Racemization was small (1.1-1.7 percent) and comparable ...
Stadler C R - - 1982
The Space Shuttle's food system consists of food products preserved by dehydration, thermostabilization, irradiation, and moisture control. A preassembled standard menu is provided for each crew member. This is supplemented with a pantry food supply. In case of emergency, the pantry is a contingency food source, but on a nominal ...
Eyal-Giladi H - - 1981
We have demonstrated that quail PGCs possess a characteristic heterochromatin nuclear marker demonstrable already at stage 6 H & H with Feulgen staining. Chimaeras of stage-XIII E. G & K chick epiblast and quail hypoblast and vice versa have been made. The chimaeras were incubated up to stage 7-8 H ...
Lebovitz R M - - 1981
Two measures of performance were used to study the effects of pulse-modulated microwave radiation (PM MWR) on schedule-controlled operant behavior of rats: 1) cued (SD), fixed-ratio (FR) bar pressing for food reinforcement; and 2) noncued (Sd) bar pressing in the absence of food reinforcement. The animals were irradiated and the ...
Ogbadu G - - 1980
Spores of Aspergillus flavus (UI, 81) inoculated into some local food materials were irradiated at 62.5, 125.0, 250.0 and 500.0 krad, and the effect on aflatoxin B1 production on subsequent incubation was measured. The results show that aflatoxin B1 production decreased with increasing gamma irradiation dose in soya bean, groundnut, ...
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