Elemental topological insulator with tunable Fermi level: strained α-Sn on InSb(001).

We report on the epitaxial fabrication and electronic properties of a topological phase in strained α-Sn on InSb. The topological surface state forms in the presence of an unusual band order not based on direct spin-orbit coupling, as shown in density functional and GW slab-layer calculations. Angle-resolved photoemission including spin detection probes experimentally how the topological spin-polarized state emerges from the second bulk valence band. Moreover, we demonstrate the precise control of the Fermi level by dopants.

Harvesting anterior iliac crest or calvarial bone grafts to augment severely resorbed edentulous jaws: a systematic review and meta-analysis of patient-reported outcomes.

The aim of this systematic review was to compare patient-reported outcomes after harvesting calvarial or anterior iliac crest bone grafts to repair severe jaw defects and enable implant placement. The MEDLINE, Embase, Cochrane Central Register of Controlled Trials databases, and OpenGrey were searched for studies on patient satisfaction, pain, disturbances in daily functioning, sensory alterations, donor site aesthetics, and complication rates. Of the 1946 articles identified, 43 reporting 40 studies fulfilled the inclusion criteria; the studies were one randomized controlled clinical trial, one retrospective controlled clinical trial, and 23 prospective and 15 retrospective cohort studies. A meta-analysis of two studies (74 patients) showed no difference in satisfaction (mean difference (MD) - 0.13, 95% confidence interval (CI) - 1.17 to 0.92; P = 0.813) or postoperative pain (directly postoperative: MD -2.32, 95% CI -5.20 to 0.55, P = 0.113; late postoperative: MD -0.01, 95% CI -0.14 to 0.11, P = 0.825) between donor sites. However, the level of evidence is limited, due to the retrospective, non-randomized design of one study. Postoperative gait disturbances were highly prevalent among the anterior iliac crest patients (28-100% after 1 week). The incidence rates of sensory disturbances and other complications were low, and the donor site aesthetic outcomes were favourable for both graft types. To conclude, harvesting bone grafts from the calvarium or anterior iliac crest to augment the severely resorbed edentulous jaw results in similar patient satisfaction. However, the findings for postoperative pain and disturbances in daily living suggest a trend in favour of calvarial bone grafts if harvested using an adjusted technique.

Morbidity of anterior iliac crest and calvarial bone donor graft sites: a 1-year randomized controlled trial.

Autogenous bone graft harvesting is still commonly considered the gold standard for the reconstruction of a severely resorbed maxillary alveolar ridge; however, the preferred donor site remains a subject of debate. This study compared the morbidity of calvarial and iliac crest donor sites after harvesting. Twenty edentulous patients with an insufficient volume of maxillary bone for reliable implant placement were assigned randomly to either calvarial (n=10) or anterior iliac crest (n=10) bone harvesting groups. All patients underwent a maxillary sinus floor elevation procedure combined with widening of the alveolar process using buccal bone blocks. Donor site morbidity was assessed before, during, and at 1year after the surgery through patient questionnaires, physical examination, and medical records. No perioperative complications occurred. The anterior iliac crest group reported minor postoperative pain after harvesting. The scars after calvaria harvesting were significantly longer (P=0.003), but this was not bothersome for the group of patients. Long-term pain was negligible and satisfaction was high in both groups. Both the calvaria and anterior iliac crest are associated with low long-term donor site morbidity and high patient satisfaction. Thus, patient-centred decision-making is appropriate when selecting the preferred harvesting method for that patient.

Using half-metallic manganite interfaces to reveal insights into spintronics.

A half-metal has been defined as a material with propagating electron states at the Fermi energy only for one of the two possible spin projections, and as such has been promoted as an interesting research direction for spin electronics. This review details recent advances on manganite thin film research within the field of spintronics, before presenting the structural, electronic and spin-polarized solid-state tunnelling transport studies that we have performed on heterostructures involving La(2/3)Sr(1/3)MnO(3) thin films separated by SrTiO(3) barriers. These experiments demonstrate that, with a polarization of spin [Formula: see text] electrons at the Fermi level that can reach 99%, the La(2/3)Sr(1/3)MnO(3)/SrTiO(3) interface for all practical purposes exhibits half-metallic behaviour. We offer insight into the electronic structure of the interface, including the electronic symmetry of any remaining spin [Formula: see text] states at the Fermi level. Finally, we present experiments that use the experimental half-metallic property of manganites as tools to reveal novel features of spintronics.

Pulmonary disease with hemorrhage in Henoch-Schöenlein purpura.

Henoch-Schönlein purpura is a common vasculitic syndrome of childhood. Pulmonary hemorrhage is a rare complication, which resulted in death in three of four previously reported cases. We report concerning four additional patients with Henoch-Schönlein purpura and pulmonary hemorrhage. Three survived the episode. Aggressive and supportive care may improve survival.

Kawasaki syndrome.

Kawasaki syndrome is an acute, self-limited illness of young children which is characterized by prolonged fever, mucositis, skin changes, and cervical lymphadenopathy. Most investigators favor a microbial agent or agents as the trigger of KS followed by an immune-mediated vasculitis with a predilection for the coronary arteries. Serious complications include coronary artery aneurysms, aneurysmal thrombosis, and death. Aspirin has been the conventional treatment for KS, but it has not been shown to alter the basic pathology. Recently intact intravenous gamma globulin has been shown to reduce the frequency of coronary artery abnormalities. Definitive therapy of KS, however, awaits the discovery of its cause and pathogenesis.

"Campylobacter upsaliensis" sepsis in a boy with acquired hypogammaglobulinemia.

A 16-year-old boy with lupus erythematosus and hypogammaglobulinemia developed bacteremia with "Campylobacter upsalinesis," a recently described Campylobacter species with minimal catalase activity. Because "C. upsaliensis" Gram stains poorly and because it is susceptible to antibiotics in standard selective media, it may be overlooked in routine handling of blood cultures.

Kawasaki syndrome.

Kawasaki syndrome is an acute mucocutaneous syndrome of young children characterized by prolonged fever, rash, mucositis, cervical adenitis, and changes of the peripheral extremities. Unlike most other illnesses, the rash is not distinctive and is remarkable for its variable morphology, site of onset, and pattern of progression. The cause and pathogenesis of Kawasaki syndrome remain a mystery, but most investigators favor a microbial agent as the trigger, followed by an immune-mediated vasculitis that has a predilection for the coronary arteries. Serious complications include coronary artery aneurysms, aneurysmal thrombosis, and death. Aspirin has been the most widely used treatment for Kawasaki syndrome, but it has not been shown to alter the basic pathology. Treatment with aspirin plus intravenous gamma globulin can reduce the frequency of coronary artery abnormalities. Definitive therapy of Kawasaki syndrome awaits the discovery of its cause and pathogenesis.

Kawasaki syndrome.

Kawasaki syndrome is an acute multisystem inflammatory disease of young children first described by Tomasaku Kawasaki in the Japanese literature in 1967. He reported 50 cases of this entity under the rubric of acute febrile mucocutaneous lymph node syndrome, a designation that has more recently been superseded by the eponym Kawasaki syndrome. The disorder was further delineated and brought to the attention of American pediatricians in 1974. Recognition of the syndrome followed rapidly, and Melish, Hicks and Larson published the first series of American cases from Hawaii in 1976. Subsequently, Kawasaki syndrome has been documented worldwide. Although the disorder is known to be a systemic vasculitis with predilection for the coronary arteries, the etiology has remained obscure despite intense investigative efforts.

Phenomenological diversity of spinal reflexes in brain death.

In brain death, spinal reflexes and automatisms are observed which may cause irritation and even doubt in the diagnosis. In the literature there are no dedicated descriptions of the diversity and of neuroanatomical considerations. In 278 examinations of 235 patients for the determination of brain death, on 42 occasions obvious spinal reflexes and/or spinal automatisms were observed in 27 brain dead bodies. Because they were not systematically searched for, minute forms have probably been missed. The reflexes (R) and automatisms (A) are described according to the time of observation in relation to the development of brain death, the presumable spinal localization and the possible phylogenetical interpretation. Especially disquieting examples are discussed in more detail, e.g. monophasic EndotrachealSuction-ThoracicContraction-R supposedly switched in segments C2-6 or TrapeziusPinch-ShoulderProtrusion-R conveyed by the accessory nerve (terminology according to the scheme: for the reflexes, Trigger-Response-R: for the automatisms, Movement-A). After these experiences a more thorough examination showed frequent observations of rather minute forms of spinal reflexes, as well as automatisms and even the Lazarus sign (in possibly more than two thirds of the examinations). An estimation of the factual frequency would necessitate special attention to those much more frequent but less obvious minute spinal reflexes and automatisms.

Renal papillary necrosis in juvenile rheumatoid arthritis.

Three patients who developed renal papillary necrosis while receiving long-term, high-dose aspirin therapy for juvenile rheumatoid arthritis are presented. It appears that aspirin alone or aspirin in combination with other drugs is the causative agent. The incidence and biologic significance of renal papillary necrosis are insufficient to alter the use of aspirin as the drug of choice in management of JRA. It is recommended that all children with JRA be encouraged to drink ample fluids and be followed with periodic urinalysis and blood pressure measurements. Those children who develop hematuria or hypertension should be evaluated by excretory urography.

Resolving complex atomic-scale spin structures by spin-polarized scanning tunneling microscopy.

The spin-polarized scanning tunneling microscope (SP-STM) operated in the constant current mode is proposed as a powerful tool to investigate complex atomic-scale magnetic structures of otherwise chemically equivalent atoms. The potential of this approach is demonstrated by successfully resolving the magnetic structure of Cr/Ag(111), which is predicted on the basis of ab initio vector spin-density calculations to be a coplanar noncollinear periodic 120 degrees Néel structure. Different operating modes of the SP-STM are discussed on the basis of the model of Tersoff and Hamann.