Heard Island is possibly the remotest speck of land on the Earth. It was only in the 18505 that the human race finally reached this most isolated of places. For the next 30 years gangs of hunters established themselves on the isolated beaches of Heard Island to slaughter the wildlife for their oil and furs and ship the products to markets half-way around the globe. The material culture remains ...

The design for a reversible microfluidic coupler is proposed for use with microreactors and other MEMS devices. However, real couplers will include imperfections that must be considered to fully evaluate the degree of sealing. A method is presented for applying a normally distributed surface finish with a predetermined amplitude to a perfectly flat contact surface. The method is then applied to...

This in vitro study evaluated the effect of different apicoectomy angles, instruments used in root-end preparation, and dental materials used in retrofilling on apical sealing. Root ends were resected at 45 or 90 degrees in 80 single-rooted teeth. For each type of apicoectomy, root-end cavities were prepared with either a round carbide #2 bur or an S12/90D ultrasonic tip. The root-end cavities ...

BACKGROUND Avoidance coping (e.g. sealing over) is common in people recovering from psychosis, but it is not understood why some individuals 'seal over'. AIMS We examined the hypothesis that individuals who 'seal over' do not have the personal resilience to withstand this major life event. METHOD Fifty participants were interviewed during an acute episode of psychosis and reassessed at 3-mo...

It is a well-known fact that inheritance as defined in most existing object-oriented languages breaks encapsulation in a very subtle way. For instance, Java provides facilities for encapsulation both at the class-level and at the packagelevel. But it also introduces language constructs (such as public/ protected modifier and inheritance) that lets clients to access the internals of a class in a...

OBJECTIVES Formaldehyde - a chemical widely used to preserve organic tissues in hospitals - is known to be carcinogenic in the long term and to cause breathing-related symptoms in the short term. We have taken advantage of an experiment to quantify this second effect among hospital workers in terms of probability of showing respiratory symptoms with respect to a benchmark in which tissues are p...

AIM Sealing of pits and fissures is one of the most effective techniques in caries prevention: however incomplete removal of plaque debris, can cause lack of retention of the sealant. MATERIALS AND METHODS Sixty first permanent molars were sealed for this study. The teeth were divided into four groups. All teeth were isolated with a dental dam before cleaning and coronal polishing was perform...

BACKGROUND The purpose of this study was to investigate factors influencing self-sealing of sclerotomy performed under gas tamponade in 23-gauge transconjunctival sutureless vitrectomy. METHODS This study was a retrospective review of 84 patients (84 eyes) who underwent 23-gauge transconjunctival sutureless vitrectomy under gas tamponade by a single surgeon. At the end of surgery, the sclerot...

We describe the effective use of the bipolar vessel-sealing device: LigaSure for the division of the internal spermatic vessels in a laparoscopic varicocelectomy. A total of 52 males with varicocele (left-side n = 49, and bilateral n = 3) were included in this study. Blunt dissection was used to isolate the packet of spermatic vessels. The packet of spermatic vessels was divided using a bipolar...

This report describes the use of a removable acrylic resin tray handle that can be easily attached to custom impression trays to produce an improved peripheral sealing zone. This device can be indicated to develop functional impressions for complete dentures using the patient-conducted muscular motion technique. In upper trays, the handle is fixed in the midline with acrylic resin, while in low...