During late September 1996, a major eruption took place at the NW part of the VatnajoÈkull glacier in central Iceland. The eruption was preceded by intense seismic activity, which began with a Mw ˆ 5:6 earthquake two days previously. Two very active volcanic systems, BaÂrdarbunga and GrimsvoÈtn, are situated in that area underneath the permanent ice cap. The volcanoseismic phenomena associated ...

BACKGROUND The diagnosis of fixed 'drug' eruption is not difficult for dermatologists, but it is difficult to identify the causative agent when the patient denies ingestion of any drugs. There have been some reported cases of fixed 'food' eruption. CASE SUMMARY A 71-year-old woman experienced repeated erythema and tense bulla with a burning sensation and pruritus on the right ankle. The erupt...

The September-October 1989 flank eruption at Mt. Etna marked a change in the recent eruptive style of the volcano. Seismicity, at mid (order of months) and short (order of days) time, preceding the eruption onset has been analysed by means of D (time fractal dimension), and of materials science equation. The behaviour of the upper and lower crust volumes has been investigated, by considering sh...

OBJECTIVE To describe the eruption chronology of the first deciduous teeth in premature infants with birth weight less than 1500 g and to compare it according to gender and nutritional status at birth. METHODS Longitudinal study including 40 low birth weight premature infants of both genders. The tooth was considered erupted when the crown went through the gum and became part of the oral envi...

OBJECTIVE To evaluate the relationship between the stages of dental formation and the timing of eruption of mandibular second premolars. MATERIALS AND METHODS The sample comprised panoramic radiographs of 25 children, 7 to 12 years old, observed by space supervision during development of dentition. The initial radiograph (T1) was taken in the mixed dentition period and the progress radiograph...

Eruption sequestrum is an uncommon disturbance in eruption and consists of small fragments of calcified tissue overlying the crowns of erupting permanent molar teeth, especially at the time of eruption of the mandibular first molars. This paper reports a case of unilateral eruption sequestrum in a 7-year-old Brazilian boy and describes its histopathological findings. A white small fragment, 0.5...

Ectopic eruption is the abnormal eruption of a permanent tooth that often causes root resorption of an adjacent primary tooth which can be noted during routine dental radiographic evaluation. The mesial eruption of the permanent first molar may be a local eruption problem or may indicate developmental arch circumference deficiency requiring further consideration. Early treatment is mandatory to...

In this paper, we present some physical models that can describe the ascent of volcanic ash into the atmosphere during a volcanic eruption. We consider both sustained volcanic eruption columns and discrete volcanic thermal clouds. To test the modeling approach, we compare our predictions of the ascent rate of a model cloud with some observations of the ascent of the ash cloud during the April 1...

Pruritic urticarial papules and plaques of pregnancy (PUPPP)(also known as polymorphic eruption of pregnancy in Europe) is an intensely pruritic eruption that affects women during the third trimester of pregnancy. Treatment usually is aimed at symptom relief until delivery, as the eruption usually resolves rapidly in the postpartum period. We report the case of a 30-year-old woman who presented...