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At least 37 records · Page 2Linked to original sources
PubMed2000

Radiation effects in dry ice: models for a peak on the Arrhenius curve

Dry ice (solid CO2) occurs in the polar caps of Mars, on the surface of Triton, and in places in the outer planets of our solar system. Radicals in gamma-irradiated solid CO2 have been studied by ESR for future applications of ESR dating on outer planets. The annealing curves for CO3- radical (ESR signal at g = 2.0126) can be described neither by the first-order nor the second-order decay kinetics. The peak observed in the Arrhenius plot can result from two parallel first-order kinetic processes. Radicals that provide overlapping signals are CO3- (g1 = 2.0057, g2 = 2.0126, g3 = 2.0161; activation energy E = 0.10 eV; frequency factor v0 = 4 x 10(1) s(-1)) and HO2 (g1 = 2.0040, g2 = 2.0055, g3 = 2.0360), which have E = 0.28 eV and v0 = 7 x 10(5) s(-1)). Hence, HO2 is more thermally stable, and use of HO2 is promising for ESR dating.

Journal Article↗
PubMed2005

Solid-state characterization of spray-dried ice cream mixes.

The main physicochemical properties of spray-dried ice cream mixes (i.e. surface composition, wettability, flowability and microstructure) were analyzed. Emulsions contained 19-44% milk fat on a dry basis and included mixes with no added emulsifier and/or sucrose. The time necessary for complete wetting of the powders correlated with the amount of surface free-fat measured by means of solvent extraction. Non-micellar casein (sodium caseinate) showed to be a better co-encapsulant than micellar casein (skim milk) as demonstrated by surface fat coverage measured by electron spectroscopy for chemical analysis (ESCA). Emulsifiers influenced the fat surface composition of the powders by reducing the amount of surface protein due to their lower interfacial tension. Surface fat caused an initial overestimation of the particle size of the powders due to fat-related caking. Powders showed no flow before and after surface fat extraction which was attributed to fat-related caking and very small particle size (<80 microm), respectively.

Calorimetry, Differential Scanning↗
PubMed1988

Blast injuries from glass bottles containing dry ice.

We present three cases (two incidents) of severe blast injury from the explosion of covered glass bottles containing dry ice. The first patient sustained lacerations of the face, left eye, right wrist and forearm, and abdomen with protrusion of the small bowel. The second sustained a deep laceration to her anterior neck. The third sustained multiple lacerations to her lower extremities and one to the labia majora. All three patients were taken to the operating room for surgical exploration and repair and were discharged without complications.

Blast Injuries↗
PubMed1990

Ocular trauma caused by exploding glass bottles containing dry ice and water.

We treated three patients with severe ocular injuries caused by exploding glass bottles containing a mixture of dry ice chips and water. One patient had a corneal laceration and traumatic cataract with several retained intraocular glass fragments. The second had a scleral laceration without corneal or lenticular involvement. The third suffered a corneal-scleral laceration, with a total retinal detachment. Following surgery, two patients recovered 20/20 vision; the third patient regained only light perception.

Adolescent↗
PubMed2004

Acute illness from dry ice exposure during hurricane Ivan--Alabama, 2004.

Natural disasters such as hurricanes often impair delivery of essential services, including electricity. When normal refrigeration methods are unavailable, affected populations seek alternative means of protecting perishable foodstuffs. One alternative is to use frozen carbon dioxide (CO2) (i.e., dry ice).

Adult↗
PubMed1977

Pulp testers and pulp testing with particular reference to the use of dry ice.

Pulp testing is mandatory before any operative procedures, invaluable in the diagnosis of pain and is an essential adjunct in the interpretation of radiolucent areas. Methods of pulp testing are reviewed and the use of dry ice for this purpose is discussed in detail. Limitations of pulp testing are considered. Vitality tests are of only limited use in traumatized teeth. The results are only qualitative and not quantitative.

Dental Pulp Diseases↗
PubMed2003

Toxicological evaluation of dry ice expanded tobacco.

A tiered testing strategy has been developed to evaluate the potential of tobacco processes, ingredients, or technological developments to change the biological activity resulting from burning tobacco. The strategy is based on comparative chemical and biological testing. Dry ice expanded tobacco (DIET) is an example of a common tobacco expansion process currently used in the manufacture of cigarettes to increase tobacco filling capacity. As part of the toxicological evaluation of DIET, test cigarettes containing DIET were compared with control cigarettes containing tobacco expanded with a traditional expansion agent (Freon-11, also known as trichlorofluoromethane). Testing included mainstream cigarette smoke chemistry studies, genotoxicity studies (Ames and sister chromatid exchange, SCE), a 13-week inhalation study in Sprague-Dawley rats, and a 30-week dermal tumor promotion study in SENCAR mice. Cigarettes containing DIET or Freon-11 expanded tobacco were similar in biological activity.

Administration, Inhalation↗
PubMed1991

Comparison of dry ice baited light traps with human bait collections for surveillance of mosquitoes in northern Queensland, Australia.

Adult mosquitoes were collected from April 1984 to September 1985, at 3 sites at or adjacent to the Ross River Dam, north Queensland. The numbers attracted to dry ice baited encephalitis virus surveillance (EVS) light traps and to human bait were similar. Both methods sampled 18 taxa and ranked the abundances of Culex annulirostris, Anopheles annulipes s.l., Aedes vigilax, Mansonia uniformis and Ma. septempunctata similarly at each locality. Significant correlations between the 2 methods were found for all 5 of the dominant species, but were stronger for Ae. vigilax, Ma. uniformis and Ma. septempunctata than for Cx. annulirostris or An. annulipes. Human bait attracted more Cx. annulirostris, Ae. vigilax and Ma. uniformis than the EVS traps. The relative effectiveness of the 2 methods varied significantly with time for Cx. annulirostris and An. annulipes, but both methods revealed similar long term population trends. These data suggest that EVS surveillance may be better suited for sampling Ae. vigilax, and human bait (or alternatively animal bait) or a combination of both methods would be more appropriate for sampling Cx. annulirostris at the dam.

Aedes↗
PubMed1996

Coffee, tea, or frostbite? A case report of inflight freezing hazard from dry ice.

Occupational and recreational cold exposure is fairly well described in the literature. This is a case report of a passenger on a commercial airline flight who suffered third degree frostbile due to the attempted therapeutic use of a cold pack. This cold pack was offered by the flight attendant and consisted of a section of dry ice used for cooling in the galley. The resulting injury consisted of a full thickness cold injury of the left lumbar amounting to approximately 1.5% TBSA (total body surface area). The occurrence of third degree frostbite due to a medicinally used ice pack such as this has not been noted in the past writings. The resulting injury, care and outcome of such an injury are described and discussed.

Adult↗
PubMed2004

Heat strain attenuation while wearing NBC clothing: dry-ice vest compared to water spray.

BACKGROUND: While wearing impermeable nuclear, biological, and chemical (NBC) clothing, reduction of thermal stress is of primary importance. We compared the effect between two cooling methods on the attenuation of heat strain. METHODS: There were six male subjects who were divided into two groups of three and exposed on two consecutive days to 125 min of exercise in a high heat load (40 degrees C, 40% RH) wearing NBC clothing. They were cooled by one of two different cooling methods: an active cooling vest (CV) based on the sublimation of dry ice, or tap water spraying (TP). RESULTS: After 2 h, rectal temperature (Tre) was significantly higher for the CV compared with the TP (38.1 +/- 0.04 degrees C vs. 37.7 +/- 0.10 degrees C, respectively). Skin temperature (Tsk) was significantly higher for the CV compared with the TP (36.60 +/- 0.54 degrees C vs. 34.90 +/- 0.35 degrees C, respectively). In the second hour, heart rate (HR) was significantly higher for CV compared with TP (118 +/- 13 bpm vs. 104 +/- 64 bpm, respectively). Heat storage was significantly higher after the first and second hours for the CV compared with the TP. The physiological strain index (PSI) was higher for CV compared with TP in the second hour. Sweat rate (msw) was significantly higher for CV compared with TP (560 +/- 45 g x h(-1) vs. 409 +/- 84 g x h(-1), respectively). Subjective thermal comfort was not significantly different. CONCLUSIONS: TP was more effective than the CV in reducing heat strain under the conditions used in the study. Until a significant breakthrough in reducing heat strain while wearing NBC clothing in field conditions can be found, TP appears to be an effective and recommended cooling method.

Adult↗
PubMedDate not supplied

[The use of dry-ice baths in treating diabetic patients with micro- and macroangiopathies].

Dry effervescent baths were tried in combined treatment of insulin-dependent and non-insulin-dependent diabetes mellitus. Positive effects were found: a decrease in hyperglycemia, glucosuria, some parameters of lipid metabolism, an increase in muscular performance, myocardial reserve, efficacy of cardiac activity. These responses as well as improvement in peripheral circulation, microcirculation and blood rheology were registered in both types of diabetes.

Adolescent↗