Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “EXPLOSIONS”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 397 records · Page 22Linked to original sources

Improved method for the detection of TATP after explosion.

TATP in post explosion exhibits was reported earlier to be best recovered from vapor phase. A typical procedure includes its adsorption on Amberlite XAD-7, elution with acetonitrile and analysis by GC/MS. In this work, improved recovery of TATP from the vapor phase was achieved by SPME using PDMS/DVB fiber and immediate sampling to GC/MS. The recovery of TATP by SPME was compared with headspace and with adsorption on Amberlite XAD-7 by spiking onto filter paper put in a 100 mL beaker. The limit of detection of TATP was 6.4 ng in these conditions, few orders magnitude more than in the other tested methods. Recovery of TATP in the presence of various solvents was also studied. Acetone, water, and mixtures of water:alcohols (1:1) were found to reduce the recovery of TATP. Using SPME, TATP has been identified in dozens of post-explosion cases.

Acetone↗

[Raman spectrum of nano-graphite synthesized by explosive detonation].

The nano-graphite powder synthesized by the detonation of explosives with negative oxygen balance is a new powder material with potential applications. In this work, the preparation of nano-graphite powder in steel chamber by pure TNT (trinitrotoluene) explosives has been introduced. In the synthesis process, the protective gases in the steel chamber are N2, CO2 and Ar, and the pressure is 0.25-2 atm. Raman spectrum of the nano-graphite was measured. The characteristic Raman band assigned to sp2 of graphite has been observed at about 1 585 cm(-1) with half-peak width of 22 cm(-1). The peak shifted to a higher frequency by 5 cm(-1) compared with that of bulk graphite. The authors explain this blue shift phenomenon by size effect. The average size of nanographite from Raman measurement is 2.97-3.97 nm. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to measure the structure and particle size of the nano-graphite. The crystallite size of nano-graphite estimated from XRD andTEM are 2.58 nm (acid untreated) and 1.86 nm (acid treated) respectively, which is in accord with the results of the measurement approximately.

Argon↗

A burn mass casualty event due to boiler room explosion on a cruise ship: preparedness and outcomes.

The purpose of this study was to review our experience with a mass casualty incident resulting from a boiler room steam explosion aboard a cruise ship. Experience with major, moderate, and minor burns, steam inhalation, mass casualty response systems, and psychological sequelae will be discussed. Fifteen cruise ship employees were brought to the burn center after a boiler room explosion on a cruise ship. Eleven were triaged to the trauma resuscitation area and four to the surgical emergency room. Seven patients were intubated for respiratory distress or airway protection. Six patients had >80 per cent burns with steam inhalation, and all of these died. One of the 6 patients had 99 per cent burns with steam inhalation and died after withdrawal of support within the first several hours. All patients with major burns required escharotomy on arrival to trauma resuscitation. One patient died in the operating room, despite decompression by laparotomy for abdominal compartment syndrome and pericardiotomy via thoracotomy for cardiac tamponade. Four patients required crystalloid, 20,000 mls/m2-27,000 ml/m2 body surface area (BSA) in the first 48 hours to maintain blood pressure and urine output. Three of these four patients subsequently developed abdominal compartment syndrome and died in the first few days. The fourth patient of this group died after 26 days due to sepsis. Five patients had 13-20 per cent bums and four patients had less than 10 per cent burns. Two of the patients with 20 per cent burns developed edema of the vocal cords with mild hoarseness. They improved and recovered without intubation. The facility was prepared for the mass casualty event; having just completed a mass casualty drill several days earlier. Twenty-six beds were made available in 50 minutes for anticipated casualties. Fifteen physicians reported immediately to the trauma resuscitation area to assist in initial stabilization. The event occurred at shift change; thus, adequate support personnel were instantaneously to hand. Our mass casualty preparation proved useful in managing this event. Most of the patients who survived showed signs of post-traumatic stress syndrome, which was diagnosed and treated by the burn center psychology team. Despite our efforts at treating large burns (>80%) with steam inhalation, mortality was 100 per cent. Fluid requirements far exceeded those predicted by the Parkland (Baxter) formula. Abdominal compartment syndrome proved to be a significant complication of this fluid resuscitation. A coordinated effort by the facility and preparation for mass casualty events are needed to respond to such events.

Body Surface Area↗

[Effects and significance of gas explosion on expression of NF-kappaB and ICAM1 in lung tissue of rats].

OBJECTIVE: To explore the expression of NF-kappaB and ICAM-1 in the gas explosion wounded lung of rats and the relationship. METHODS: Digoxin labeled NF-kappaB was used as probe. In situ hybridization was performed to detect the NF-kappaB mRNA. Immunohistochemistry was used to detect the expression of NF-kappaB and ICAM-1. RESULTS: The levels of NF-kappaB mRNA, the expression of NF-kappaB and ICAM-1 in the wounded rats were significantly increased and reached their peak two hours after injury. Pathology of lung tissue showed that some crachea epithelium mucosae were desquamated; congestion, edema of trachea wall and infiltration of neutrophilic granulocytes were found; hemorrhage, edema and infiltration of lots of inflammatory cells were present in alveolus cells. Electron microscope showed that type I, especially type II alveolus epithelia had degeneration and desquamation. CONCLUSION: The injury of gas explosion can activate NF-kappaB, which has close correlation with the acute injury to lung.

Animals↗

[Effects of explosions on cortical response threshold and enzyme activities in inner ear of guinea pigs].

Effects of explosions of different intensities on cortical response threshold (CRT) and activities of succinic dehydrogenase (SDH) and acetylcholinesterase (AchE) in the inner ear were studied on 37 guinea pigs. The results revealed various degrees of cochlear damages due to different doses of explosions, and also a negative correlation between hearing loss and the enzyme activities in both TTS and PTS. The significance of the results is discussed.

Acetylcholinesterase↗

[Influences of explosion on hearing threshold and acetylcholinesterase activity in inner ears].

Fifty-seven guinea pigs weighting 200-400 g with normal Preyer's reflexes were randomly divided into five groups, one for control and the others studied 8, 48 hours and 7, 30 days after explosion. Cortical response threshold measurement and AchE histochemical observations were made. Histochemical sections were prepared as follows: under anesthesia, blood was washed out with Ringer's solution, then the animals were perfused with ice-cold neutral formol-calcium solution for 10 minutes. Temporal bones were removed and fixed in the same fixative for 24 hours. Fixed specimens were decalcified in 10% EDTA solution at 15 degrees C for one week. Tissue blocks were sectioned serially at 20 microns in a cryostat. Horizontal sections were obtained. Sections were then incubated in a substrate solution prepared according to Tsuji (1983) at 4 degrees C for 50 minutes, washed with 3 changes of distilled water and mounted in 25% gelatin. Inhibitory tests were carried out to non-specified chE or Pseudo-chE activity by using iso-OMPA during incubation. Control sections were incubated without the substrate. The results showed that explosion reduced the AchE activity of the cochlea and elevated cortical response threshold. Both showed a negative correlation. The significance of the results obtained had been discussed.

Acetylcholinesterase↗

[Accidental explosions in Denmark when working on containers for combustible fluids].

Gases may be formed in containers for inflammable fluids and these may burn explosively if lit. Even apparently empty containers may contain sufficient quantities of gas to result in violent explosions precipitated by procedures which produce heat or sparks in the neighbourhood of the container. Seventeen persons were found to be injured in accidents of this type in a Danish investigation. Two of the accidental injuries proved fatal. The serious risk involved in handling and treating containers which contain or have contained inflammable fluids is, therefore, emphasized.

Accidents, Occupational↗

[About progressive deafness after a detonation and explosion trauma (author's transl)].

A case is reported in which deafness was caused by an explosion trauma during wartime. In an expertise in 1954 a causal relationship between the explosion and the deafness was rejected. Advances in medical technology and research into deafness resulting from acustic trauma led to a revision of the previous decision, therefore in 1978 the deafness was acknowledged as war damage and this statement was confirmed by court judgement. The possibilities of a progressive development of ear or skull trauma due to sound is discussed. The point is stressed that there can be longtime intervals between the trauma and the onset and development of resulting deafness. This fact should induce therapeutic consequences, some of the so far tried approaches in therapy are reported.

Audiometry↗

Fatal colonic explosion during colonoscopic polypectomy.

A patient is described who sustained the first reported colonic explosion during colonoscopic polypectomy. Mannitol solution was used for bowel preparation, and the colon was completely clean. During snare removal of a cecal polyp using high-frequency current a loud explosion occurred. In spite of emergency surgery with transfusion of 45 units of blood, uncontrollable hemorrhage persisted from multiple bleeding points, and the patient died. This occurrence seems to us to justify the routine use of carbon dioxide insufflation during polypectomy and the avoidance of mannitol for bowel preparation.

Aged↗

[Intravesical explosion during endoscopic resection. Apropos of a case].

Intravesical explosion during endoscopic resection are rare but may be devastating in effect, as shown by the case reported. The formation of explosive gas, essentially an air-hydrogen mixture, results from carbonization of tissues (particularly with the coagulation current) and the introduction of air into the bladder during manipulation of the resector. The nature of the bladder infusion liquid does not appear to play an important role. Prevention implies the use of a coagulation current of moderate power, the avoidance of air entering the bladder accidentally, and the continuous or repeated evacuation of the air bubble under the bladder vault.

Cystoscopy↗

[Dirt tattooing following an explosion in a chemistry class].

Traumatic tattooing following an explosion can generally be removed by rubbing with a hard-bristle handbrush within 48 h after the accident occurs. This measure failed, however, in the case of a pupil with extensively dispersed granular material in the face. The patient had mixed approximately 5 g of potassium permanganate and red phosphorus together during a chemistry lesson (!), thereby causing an explosion. A conservative treatment of applying compresses moistened with a sodium bicarbonate solution led to healing without scars.

Adolescent↗

Transfer of nitroglycerine to hands during contact with commercial explosives.

The techniques of thin-layer chromatography, gas chromatography with electron capture detection, and gas chromatography/mass spectrometry were used to analyze hand swab extracts for the presence of nitroglycerine. Both the amount of nitroglycerine transferred to the hands after handling commercial explosives and its persistence were measured. Gas chromatography-electron capture detection was found to be the most accurate and sensitive technique for making such determinations, especially if the extract was partially purified by thin-layer chromatography prior to analysis. The lowest limit of detection was 10 ng of nitroglycerine, and residues could be detected over 20 h after handling the raw explosive.

Chromatography, Gas↗

The collection and determination of ethylene glycol dinitrate, nitroglycerine, and trinitrotulene explosive vapors.

The method presented in this paper demonstrated that minute quantities of explosives such as EGDN, NG, and TNT can be easily detected and determined in relatively large amounts of debris after collecting their vapors on porous polymer beads. The method of collecting explosive vapors is simple, inexpensive, sensitive, and relatively fast compared to microscopic and physical methods of analysis.

Chromatography, Thin Layer↗

[Danger of fire and explosion in anaesthetic and surgical departments].

Corresponding to the fact that flammable anaesthetics are still very seldron in use the possibility of fires an explosions has diminished; the frequency of accidents caused by flammable colonic gases and by desinficients is about unchanged whilst a new kind can and dose occur: Fires and (occassional) explosions with "nonflammable" anaesthetic technics. A survey about 16 cases (including oxygen-fires) should be of interest for surgeons and intensive-care-people as well as for anaesthetists.

Anesthesia↗

Reconstruction of foot defects due to mine explosion using muscle flaps.

Landmine explosions bring a formidable challenge to both patients and reconstructive surgeons. Free tissue transfer is the only method of repairing such extensive soft tissue defects of the foot after serial debridements. Sixty-five consecutive free muscle flap transfers were performed in 54 patients who had foot defects involving soft tissue and bone due to mine explosions. Although posttraumatic vessel disease had complicated most of the cases, overall flap survival rate was 83%. Each patient was ambulatory. Ulceration in long-term period was seen in only one patient. Eighty-five percent of patients with successful bone reconstruction and 41.6% of patients without adequate bone replacement demonstrated normal weightbearing in footprints and gait analysis. Free muscle flaps with split thickness skin graft and bone replacement are recommended for the reconstruction of such devastating wounds.

Adult↗

Spectrofluorimetric determination of 1,3,5-trinitro-1,3,5-triazacyclohexane (hexogen, RDX) as a nitramine type explosive.

RDX is one of the most important military explosives. It is a component of some plastic explosives which are frequently used in terrorist attacks. Two fluorimetric methods have been described for the quantitative determination of RDX which are based on the detection of nitrite ions. After a basic decomposition of RDX the nitrite ion can be detected by reaction with 4-aminofluorescein and by reactions forming a lumogallion-gallium(III) complex. These fluorimetric methods have been compared to a photometric reaction (Griess reaction) for determination of nitrite ions. It has been found that the fluorimetric methods have a higher sensitivity than the photometric method and they have been used in a wider concentration range.

Fluorescein↗

A research on determination of explosive gases utilizing cataluminescence sensor array.

In this paper, we propose a model of a sensor array system, which consists of three cataluminescence sensors based on nanosized SrCO3, gamma-Al2O3 and BaCO3 as catalysts, for quantitative analysis of the explosive gases of propane, n-butane and iso-butane in a mixture. Six linear regression equations of the cataluminescence intensity vs. the gas concentrations in the range 2000-10,000 ppm were established from the sensor array system at two working temperatures, as the explosive gases show different sensitivity to the three sensors. The least squares method was employed for solving the simultaneous equations and quantifying the concentrations of the three components. The detection limits (3sigma) of propane, n-butane and iso-butane on SrCO3, gamma-Al2O3 and BaCO3 sensors are 50, 40 and 20 ppm, 80, 60 and 40 ppm, and 20, 10 and 5 ppm, respectively. The concentrations of two artificial samples containing the tertiary mixture were analysed with satisfactory results.

Aluminum Oxide↗

Traumatic amputation by explosive blast: pattern of injury in survivors.

Explosive blast causes a pattern of injury including primary blast lung, secondary fragment injury and traumatic amputation of limbs. Major traumatic amputation is rare in survivors of bomb blast but common in those who die. The mechanism of such injury has not been previously determined, but must be established if protective measures are to be developed for members of the armed forces. The nature of 41 traumatic amputations in 29 servicemen who survived to reach medical care after blast injury was investigated to determine the anatomical level of amputation and the pattern of soft tissue damage. Joints were an infrequent site of amputation and the tibial tuberosity was a particularly frequent site of lower-limb severance. Comparison of the pattern of injury was made with that seen in ejecting fast-jet pilots, who frequently suffer major flailing injury; there appears to be a substantially different injury distribution. The accepted mechanism of traumatic amputation, avulsion by the dynamic overpressure, is challenged; it is suggested that the shockwave resulting from an explosion is capable of causing at least bone disruption in a limb.

Amputation, Traumatic↗