Recent progress on topological semimetal IrO2: electronic structures, synthesis, and transport properties.

5dtransition metal oxides, such as iridates, have attracted significant interest in condensed matter physics throughout the past decade owing to their fascinating physical properties that arise from intrinsically strong spin-orbit coupling (SOC) and its interplay with other interactions of comparable energy scales. Among the rich family of iridates, iridium dioxide (IrO2), a simple binary compound long known as a promising catalyst for water splitting, has recently been demonstrated to possess novel topological states and exotic transport properties. The strong SOC and the nonsymmorphic symmetry that IrO2possesses introduce symmetry-protected Dirac nodal lines (DNLs) within its band structure as well as a large spin Hall effect in the transport. Here, we review recent advances pertaining to the study of this unique SOC oxide, with an emphasis on the understanding of the topological electronic structures, syntheses of high crystalline quality nanostructures, and experimental measurements of its fundamental transport properties. In particular, the theoretical origin of the presence of the fourfold degenerate DNLs in band structure and its implications in the angle-resolved photoemission spectroscopy measurement and in the spin Hall effect are discussed. We further introduce a variety of synthesis techniques to achieve IrO2nanostructures, such as epitaxial thin films and single crystalline nanowires, with the goal of understanding the roles that each key parameter plays in the growth process. Finally, we review the electrical, spin, and thermal transport studies. The transport properties under variable temperatures and magnetic fields reveal themselves to be uniquely sensitive and modifiable by strain, dimensionality (bulk, thin film, nanowire), quantum confinement, film texture, and disorder. The sensitivity, stemming from the competing energy scales of SOC, disorder, and other interactions, enables the creation of a variety of intriguing quantum states of matter.

Management of human papillomavirus-related head and neck cancer.

Human papillomavirus (HPV)-related head and neck malignancies (HNMs) have become a serious health risk over the past 20 years. Despite decreases in non-HPV-related HNMs, the incidence of HPV-related HNMs has skyrocketed, and a new form of tumorigenesis is developing. HPV type 16 is the primary offender, and the majority of these tumors present in the oropharynx, with a smaller proportion in the larynx and oral cavity. While traditionally treated with surgery, the paradigm has shifted to more of a nonoperative chemoradiation therapy approach, with the hope of improving vital functions after therapy. Unfortunately, we continue to see significant dysphagia in these patients after treatment, and work is being done to improve outcomes. With the advent of transoral robotic surgery, we have again been able to reconsider treatment options for these patients, although it has been met with some skepticism and resistance. Here we discuss the scope of HPV-related HNMs, the treatment options and prognosis for the disease, and finally touch upon psychosocial issues related to HPV-related HNMs.

Changes in von Willebrand factor and fibrinolysis following a post-exercise cool-down.

The purpose of this study was to determine the effect of a post-exercise active cool-down on von Willebrand factor and fibrinolysis. Ten subjects performed two maximal oxygen uptake (VO2max) tests followed by a 10-min passive (PC) or an active (AC) cool-down. Blood samples were obtained pre-exercise, post-exercise, post-PC/AC, and 1 h post-exercise and analyzed for von Willebrand factor antigen (vWf:Ag), tissue plasminogen activator (tPA) antigen and activity and plasminogen activator inhibitor-1 (PAI-1) activity. Data were analyzed using repeated measures analysis of variance. No significant differences were found between VO2max tests for treadmill time, VO2max, respiratory exchange ratio, maximal heart rate, or maximal blood lactate concentration. vWf:Ag was significantly elevated (P <0.05)following PC [198.4 (18.3)% normal] versus AC [174.5 (15.6)% normal] and remained elevated 1-h post-exercise [179.4 (16.4)% normal for PC vs 158.6 (13.8)% normal for AC]. There were no differences between tests for tPA or PAI-1 activity, although tPA antigen was significantly elevated following PC versus AC (P <0.05). Following the cool-down, hematocrit was higher (P <0.05) for the PC test [48.90 (0.36)] compared with AC [47.43 (0.51)]. An AC reduces post-exercise vWf:Ag and tPA antigen without affecting tPA or PAI-1 activity.

Rare Bleeding Disorder Registry: deficiencies of factors II, V, VII, X, XIII, fibrinogen and dysfibrinogenemias.

A North American registry for rare bleeding disorders [factor (F)II, factor (F)VII, factor (F)X, factor (F)V, factor (F)XIII, fibrinogen deficiencies and dysfibrinogenemias] was established to gather information about disease prevalence, genotyping frequency, diagnostic events, clinical manifestations, treatment and prophylaxis strategies, as well as disease- and treatment-related complications. Questionnaires were sent to 225 hemophilia treatment centers in the USA and Canada. Among 26% of responding centers, 294 individuals [4.4% of the registered children (200/4583) and 2.4% of adults (94/3809)] were diagnosed with one or more of the rare bleeding disorders (RBDs) included in this survey. The ethnic distribution for each disorder paralleled that of the general US population with the exception of the disproportionately large number of Latinos with FII deficiency. Only 5.4% of affected individuals were genotyped. An abnormal preoperative bleeding screen most often led to diagnosis. The most common coagulopathy was FVII deficiency; however, 40% of homozygous patients were asymptomatic. FX and FXIII deficiencies caused the most severe bleeding manifestations. Among all RBDs, the most common sites of bleeding were skin and mucus membranes. Multiple products were used to treat hemorrhage; however, half of the bleeding episodes required no therapy. The majority of patients suffered no long-term complications from hemorrhage. Treatment-related complications included viral seroconversion, anemia, allergic reactions and venous access device-related events. This registry provides the most comprehensive information to date about North American individuals with RBDs and could serve as an important resource for both basic scientist and clinician.

Multidisciplinary treatment of chronic pain patients: its efficacy in changing patient locus of control.

OBJECTIVE: To assess the efficacy of multidisciplinary treatment in altering chronic pain patient locus of control beliefs. DESIGN: A before-and-after treatment design including demographics. PARTICIPANTS: Seventy-three chronic nonmalignant pain patients who completed study questionnaires both before and after treatment. SETTING: Comprehensive, outpatient, multidisciplinary pain management program at a large Midwestern university medical center. MAIN OUTCOME MEASURES: Pain Locus of Control Scale and Survey of Pain Attitudes Control subscale. RESULTS: Patients' perceptions of personal control over pain increased from pretreatment to posttreatment, and patients' perceptions of external control over pain, such as fate or powerful others. decreased from pretreatment to posttreatment. CONCLUSIONS: This study supports the efficacy of chronic pain management centers in altering patient beliefs about pain. The ability to increase patients' self-efficacy in their control over pain and to decrease external attributions are essential to successful pain management.