Brand-switching and tobacco taxation in Vietnam.

Background: The government of Vietnam is embarking on a radical tobacco excise tax reform, switching from the current pure ad valorem scheme to a mixed system by adding a specific component. There have been concerns raised by state-owned tobacco companies against this initiative that switching to a mixed scheme may shift consumption away from cheaper, domestic brands to more expensive, foreign brands (produced locally by joint ventures between multinational tobacco companies and domestic firms) and to illicit cigarettes, thus impairing the domestic industry, rather than reducing cigarette consumption effectively. Unfortunately, although this concern has been one of the biggest obstacles to the tobacco tax reform in the country, no study thus far has attempted to address it due mostly to the unavailability of relevant micro-market data with detailed information on brand choice.

Thickness-dependent in-plane anisotropy of GaTe phonons.

Gallium Telluride (GaTe), a layered material with monoclinic crystal structure, has recently attracted a lot of attention due to its unique physical properties and potential applications for angle-resolved photonics and electronics, where optical anisotropies are important. Despite a few reports on the in-plane anisotropies of GaTe, a comprehensive understanding of them remained unsatisfactory to date. In this work, we investigated thickness-dependent in-plane anisotropies of the 13 Raman-active modes and one Raman-inactive mode of GaTe by using angle-resolved polarized Raman spectroscopy, under both parallel and perpendicular polarization configurations in the spectral range from 20 to 300 cm.

Prefabrication of 3D cartilage contructs: towards a tissue engineered auricle--a model tested in rabbits.

The reconstruction of an auricle for congenital deformity or following trauma remains one of the greatest challenges in reconstructive surgery. Tissue-engineered (TE) three-dimensional (3D) cartilage constructs have proven to be a promising option, but problems remain with regard to cell vitality in large cell constructs. The supply of nutrients and oxygen is limited because cultured cartilage is not vascular integrated due to missing perichondrium.

Customized tissue engineering for ear reconstruction.

Tissue engineering (TE) of cartilage for reconstructive surgery has proven to be a promising option for obtaining tissue for 3D structures that results in minimal donor site morbidity. Technological advances in this area are important since many defects can only be treated with customized implants. Most TE strategies rely on the use of resorbable 3D scaffolds to guide the growing tissue, with each tissue requiring a specific scaffold that has precisely defined properties depending on the physiological environment.

Effectiveness of free gracilis muscle flaps in the treatment of chronic osteomyelitis with purulent fistulas at the distal third of the tibia in children.

Background: Chronic purulent infection at the distal third of the tibia resulting from of a previous hematogenous osteomyelitis in children is a severe infection which is seldom reported in the literature and remains a difficult challenge for orthopaedic surgeons.

Methods: A 6-year retrospective review from September 2001 to October 2006 (institutional review board-approved) was performed to evaluate postoperative surgical results of this type of infection using a free gracilis muscle flap.

Results: A total of 6 children with an average age of 9.

Successful re-construction of a large tissue defect using a free pre-fabricated flap with purely implanted arterialised venous loop.

Flap pre-fabrication represents an interesting technique in tissue-defect reconstruction. In this article we report the successful clinical application of a free pre-fabricated flap using an isolated arterialised venous loop as an implanted vascular pedicle for reconstruction of an extended soft-tissue defect on the leg, as well as clinical neo-vascularisation development following arterialised venous loop implantation. The procedure appears potentially useful in selected patients due to the easy harvest of an isolated vein loop as well as a favourable functional and aesthetic result at the donor site.

Neovascularization and free microsurgical transfer of in vitro cartilage-engineered constructs.

Cartilage tissue engineering shows to have tremendous potential for the reconstruction of three-dimensional cartilage defects. To ensure survival, shape, and function, in vitro cartilage-engineered constructs must be revascularized. This article presents an effective method for neovascularization and free microsurgical transfer of these in vitro constructs.

Influence of silicone sheets on microvascular anastomosis.

The use of silicone products combined with free flap transfer is well established in reconstructive surgery. We determined the risk of thrombosis as a result of direct contact between the silicone sheet and the point of microanastomosis. We performed microvascular surgery in 24 female Chinchilla Bastard rabbits weighing 3500 to 4000 g using two groups: Group 1 (n = 12), microanastomosis directly in contact with silicone sheets; and Group 2 (n = 12), microanastomosis protected by a 2 x 3 x 1-cm muscle cuff before being placed in contact with the silicone.

Microsurgical finger replantation in Hanoi, Vietnam: our first experience.

In this retrospective study, the author reports on preliminary results of finger replantations performed in the Department of Traumatology, Orthopaedics and Hand Surgery at Central Hospital 108, No. 1 Tran Hung Dao, Hanoi, Vietnam between September 1999 and December 2002. Forty-six amputated digits involving thirty-two complete and fourteen incomplete fingers were replanted and subsequently evaluated.