Unique Positions Research Articles

Source-blind localization and segregation model featuring head movement and reflection removal

This model takes two simultaneous speech signals, spatialized to unique azimuth positions and convolved with a simple multi-tap stereo impulse response. The model first identifies reflections and generates an inversion filter for the left and right channels. It then localizes the sources and virtually rotates its head to a known orientation for the best resulting segregation of the sources. Next, the model segments the input signals in time and frequency, applies the inverse filter, and searches for residual energy in each bin to compensate the target signal from the mixture. From the residual non-canceled energy, it generates a binary masking map and overlays this on the mixed signal’s spectrogram to extract only the target signal. Improvement in SNR from head rotation approaches over 30 dB.

Selectivity determinants of GPCR-G-protein binding.

The selective coupling of G-protein-coupled receptors (GPCRs) to specific G proteins is critical to trigger the appropriate physiological response. However, the determinants of selective binding have remained elusive. Here we reveal the existence of a selectivity barcode (that is, patterns of amino acids) on each of the 16 human G proteins that is recognized by distinct regions on the approximately 800 human receptors. Although universally conserved positions in the barcode allow the receptors to bind and activate G proteins in a similar manner, different receptors recognize the unique positions of the G-protein barcode through distinct residues, like multiple keys (receptors) opening the same lock (G protein) using non-identical cuts. Considering the evolutionary history of GPCRs allows the identification of these selectivity-determining residues. These findings lay the foundation for understanding the molecular basis of coupling selectivity within individual receptors and G proteins.

Application of the Layered Learning Practice Model in an Academic Medical Center

The layered learning practice model (LLPM) is a teaching strategy designed to train residents to precept students and other residents with the oversight of a seasoned clinical pharmacist. This model serves as a tool for residency programs to implement quality precepting opportunities and learning experiences as they look for new ways to integrate multiple learners into the practice setting. The levels of the LLPM include a senior preceptor, resident, and student. It is best implemented through utilization of 4 steps: orientation to the LLPM, preexperience planning, implementation, and postexperience evaluation. Orientation introduces preceptors and residents to the LLPM and outlines expectations for each precepting level. Preexperience planning allows the resident to take a leadership role in developing calendars, rotation activities, rubrics, and activities that match goals and objectives. For implementation, the senior preceptor maintains an active role with all learners; the resident serves as the student's primary preceptor and is responsible for incorporating the student into clinical activities, evaluating student work, and providing feedback. Postexperience evaluation is designed to solicit and provide feedback to the resident and student and to identify recommendations for improvement of the LLPM. Overall, the LLPM is a multi-layered model incorporating the expertise and unique learning positions of the senior preceptor, resident, and student. Redistributing components of the senior preceptor's responsibility amongst learners may result in expansion of patient care and clinical services and help satisfy the increasing demands placed on pharmacists.

Application of the Layered Learning Practice Model in an Academic Medical Center.

The layered learning practice model (LLPM) is a teaching strategy designed to train residents to precept students and other residents with the oversight of a seasoned clinical pharmacist. This model serves as a tool for residency programs to implement quality precepting opportunities and learning experiences as they look for new ways to integrate multiple learners into the practice setting. The levels of the LLPM include a senior preceptor, resident, and student. It is best implemented through utilization of 4 steps: orientation to the LLPM, preexperience planning, implementation, and postexperience evaluation. Orientation introduces preceptors and residents to the LLPM and outlines expectations for each precepting level. Preexperience planning allows the resident to take a leadership role in developing calendars, rotation activities, rubrics, and activities that match goals and objectives. For implementation, the senior preceptor maintains an active role with all learners; the resident serves as the student's primary preceptor and is responsible for incorporating the student into clinical activities, evaluating student work, and providing feedback. Postexperience evaluation is designed to solicit and provide feedback to the resident and student and to identify recommendations for improvement of the LLPM. Overall, the LLPM is a multilayered model incorporating the expertise and unique learning positions of the senior preceptor, resident, and student. Redistributing components of the senior preceptor's responsibility amongst learners may result in expansion of patient care and clinical services and help satisfy the increasing demands placed on pharmacists.

The development of a stabbing machine for forensic textile damage analysis

This article describes the development of a horizontal stabbing machine with an interchangeable knife holder to simulate stab events. The machine consists of a motorised arm with a pneumatic system designed to deliver 60 unique stabbing positions. The mechanics were robust and the positioning system highly reproducible with standard deviations of less than 1.0mm in the x-axis and 2.3mm in the y-axis for a given stab position. The force of the instrument may be varied by the operator to a maximum of approximately 221N. The suitability of the instrument for simulating stab events was evaluated by measuring the severance length and textile damage from stab delivered from four different knives and nine penetrating angles.

Development of a 690\u2009K SNP array in catfish and its application for genetic mapping and validation of the reference genome sequence

Single nucleotide polymorphisms (SNPs) are capable of providing the highest level of genome coverage for genomic and genetic analysis because of their abundance and relatively even distribution in the genome. Such a capacity, however, cannot be achieved without an efficient genotyping platform such as SNP arrays. In this work, we developed a high-density SNP array with 690,662 unique SNPs (herein 690 K array) that were relatively evenly distributed across the entire genome, and covered 98.6% of the reference genome sequence. Here we also report linkage mapping using the 690 K array, which allowed mapping of over 250,000 SNPs on the linkage map, the highest marker density among all the constructed linkage maps. These markers were mapped to 29 linkage groups (LGs) with 30,591 unique marker positions. This linkage map anchored 1,602 scaffolds of the reference genome sequence to LGs, accounting for over 97% of the total genome assembly. A total of 1,007 previously unmapped scaffolds were placed to LGs, allowing validation and in few instances correction of the reference genome sequence assembly. This linkage map should serve as a valuable resource for various genetic and genomic analyses, especially for GWAS and QTL mapping for genes associated with economically important traits.

How Victorian Periodicals Mourn: Obituaries and Memorial Essays

How Victorian Periodicals Mourn:Obituaries and Memorial Essays April Patrick (bio) In an era when the reigning monarch mourned her husband for nearly forty years, the Victorian preoccupation with death appeared in artifacts ranging from mourning jewellery to post-mortem photography to black-bordered memorial cards. Just as these products for memorializing the dead varied widely, so did literary responses to death, which spanned genres and media. In the month following Charles Dickens's death, on 9 June 1870, written memorials for the beloved author, editor, and publisher filled the pages of magazines and newspapers. Barely twelve hours after Dickens's death, the Times published more than two thousand words on the deceased writer, as did other London daily newspapers, including the Pall Mall Gazette, the Morning Post, and the Standard. Many of the monthly publications printed lengthier responses to the loss in their July 1870 issues, including those by Dickens's friends and colleagues in Macmillan's Magazine, Temple Bar, Fraser's Magazine, New Monthly Magazine, Gentleman's Magazine, and St. Paul's Magazine. Other periodical coverage of the author's death, including reports on the burial and speeches made about the deceased, is excluded here, as it performs a different function from the writings that memorialized Dickens. Additionally, many periodicals also included poetic responses to his death in such forms as the elegy. The obituary in the 10 June 1870 issue of the Times, "Death of Charles Dickens," includes details of Dickens's final illness and death before focusing mostly on his life, publications, and career. With two paragraphs near the end devoted to Dickens's oral readings of his popular works, the article quotes from "his parting speech on the occasion of his last reading at St. James's-hall" as the author's own farewell to his fans: "from these garish lights I vanish now for evermore, with one heartfelt, grateful, respectful, and affectionate farewell" (12). It then concludes with a paragraph of reflection on what made Dickens such a popular writer before a final note on Dickens's father-in-law, "a musical writer of some eminence in his day" (12), a seemingly odd addition but one that supports the news-focused nature of the obituary, which reported any details available. [End Page 196] Many of the weekly papers could not print the news until the following week's issue, though the Examiner and London Review printed a short paragraph in the "Latest Intelligence" section of their 11 June 1870 issue announcing Dickens's death and promising "a detailed notice of the life and labours of the celebrated novelist . . . in our next week's issue" (377). The 18 June 1870 issue fulfills this promise, with a detailed account of Dickens's life and career referencing the same dates and publications as the Times and even quoting the same parting address from Dickens. The article concludes with a series of compliments on Dickens's personality and talents while maintaining a journalistic distance. In both this obituary and the one from the Times, any editorializing describes Dickens's popularity and skill as a writer and performer, hardly debatable or unique positions. In its 18 June 1870 issue, the Athenæum, another weekly paper, also publishes about Dickens's death but does so in a style that, on its surface, diverges from the obituaries discussed above in two ways: first, the page is surrounded by a thick black border, like a memorial card; and, second, it is signed by its author, Henry F. Chorley. Though he begins with a standard discussion of Dickens's works in chronological order, Chorley shifts the focus to acknowledge his personal relationship with the author and note how having "know[n] Charles Dickens in the intimacy of his own home" leads him to "such emotion as almost incapacitates the heart and hand" (804). Chorley continues, praising Dickens for personal attributes such as his friendliness, generosity, and dedication, with specific details that indicate his own observation of them, noting, "Dickens was incomparable" (804). A deep sense of grief pervades the entire article, with Chorley's feeling of loss most apparent in the final sentence: "On a future day, I may endeavour to fill...

Parent perceptions of health promotion for school-age children with spina bifida.

To gain insight into how parents develop their beliefs of health promotion for their children with spina bifida (SB) and how they develop and promote health promotion practices for their children. Qualitative, exploratory design with semi-structured interviews of parents of children between 6 and 12 years of age diagnosed with SB was used for this study. Perceptions of health promotion were maintaining healthy bowel function and managing SB care. Good bowel function and SB management is health promotion and adequate bowel function is viewed as a marker of health. Maintaining healthy bowel function was identified by parents as the key marker of health for their children with SB. Further, the term health promotion brought up plans, concerns, and goals more related to their child's physiologic functioning and health care needs rather than promoting health and avoiding preventable disease. Nurses and healthcare providers are in unique and powerful positions for strategizing with parents on how to integrate health promotion into the lives of children with SB. Team-based, whole-person, holistic assessment and teaching inclusive of promoting healthy lifestyle behaviors in addition to providing excellent care related to their physiologic systems affected by SB can improve how we promote health for these children.

A Diversity of Human Hematopoietic Differentiation Programs Identified through In Vivo Tracking of Hematopoiesis in Wiskott-Aldrich Syndrome Patients

The historical model of hematopoiesis, mainly derived from murine studies, is based on the existence of a single hematopoietic stem cell (HSC) capable of generating all blood cell lineages. However this model has been challenged by the proposal of four types of murine HSC, which differ by their relative contribution to the myeloid and lymphoid lineages. Here we have used data from a gene therapy trial to treat Wiskott-Aldrich syndrome (WAS) to explore hematopoiesis in humans. In the trial, the therapeutic vector (lentivirus) integrates into the genome at unique positions in each hematopoietic stem and progenitor cell (HSPC) and is consequently transmitted to all its progeny. Thus hematopoietic ontogeny in humans can be inferred by tracking the appearance of unique integration sites in fractionated blood cell populations. This provides a unique opportunity to model the developmental complexity of the human haematological system. Considerable effort over the last 15 years has been devoted to optimizing retroviral integration sites (RIS) analysis using ligation mediated PCR (LM-PCR), combined with acoustic shearing and high-throughput Illumina sequencing. Acoustic shearing enables more precise quantification of RIS abundance through the enumeration of the various sizes of shear fragments (SonicAbundance) containing a given RIS, which correspond to individual ancestor HSPC and its blood progeny.In four WAS patients treated by gene therapy, we have sorted peripheral blood samples for 5 cell types: myeloid (granulocytes and monocytes) and lymphoid subpopulations (T, B and NK cells), and analysed their RIS profile. Each RIS corresponds to a particular stem/progenitor cell clone, with a particular pattern defined by its presence or absence in each of the 5 lineages. These data are then use to reconstruct aspects of the hematopoietic hierarchy. In order to face the challenging issue of cell sorting contamination we have been using a stringent sort precision mode and we treat residual contamination explicitly in downstream statistical models. Using these approaches, we have characterized up to tens of thousands RIS per patients with a follow up of 4 years.In order to minimize biases due to sparse sampling, we concentrate on the more abundant RIS clones that can be more easily caught and are therefore analysed more reliably. We showed that a significant fraction of RIS clones are detected in a single lineage, while other RIS clones are characterized by different levels of contribution to the myeloid and lymphoid lineages, highlighting the heterogeneity of human HSC. Clones contributing to all 5 lineages are readily recovered but this study also unravels a diversity of inferred hematopoietic programs with various potentials contributing to human blood homeostasis. Longitudinal analysis of clonal dynamics is ongoing, with preliminary results highlighting the maintenance of this heterogeneity of HSPC over time. These new findings provide unique data on human hematopoiesis based on gene corrected WAS patients. DisclosuresNo relevant conflicts of interest to declare.

Saccade plan overlap and cancellation during free viewing

In the current study, we examined how the saccadic system responds when visual information changes dynamically in our environment. Previous studies, using the double-step task, have shown that (a) saccade plans could overlap, such that saccade preparation to an object started even while the saccade preparation to another object was ongoing, and (b) saccade plans could be cancelled before they were completed. In these studies, saccade targets were restricted to a few, experimenter-defined locations. Here, we examined whether saccade plan overlap and cancellation mechanisms could be observed in free-viewing conditions. For each trial, we constructed sets of two images, each containing five objects. All objects have unique positions. Image 1 was presented for several fixations, before Image 2 was presented during a fixation, presumably while a saccade plan to an object in Image 1 was ongoing. There were two crucial findings: (a) First, the saccade immediately following the transition was sometimes executed towards objects in Image 2, and not an object in Image 1, suggesting that the earlier saccade plan to an Image 1 object had been cancelled. Second, analysis of the temporal data also suggested that preparation of the first post-transition saccade started before an earlier saccade plan to an Image 1 object was executed, implying that saccade plans overlapped.

Normalization to Maximal Voluntary Contraction is Influenced by Subacromial Pain.

In this study, we aimed to determine if electromyography (EMG) normalization to maximal voluntary isometric contractions (MVIC) was influenced by subacromial pain in patients with subacromial impingement syndrome. Patients performed MVICs in unique testing positions for each shoulder muscle tested before and after subacromial injection of local anesthetic. In addition to collection of MVIC data, EMG data during an arm elevation task were recorded before and after injection. From a visual analog pain scale, patients had a 64% decrease in pain following the injection. Significant increases in MVICs were noted in 4 of the 7 shoulder muscles tested: anterior, middle and posterior deltoid, and lower trapezius. No significant differences were noticed for the upper trapezius, latissimus dorsi, or serratus anterior. MVIC condition (pre and post injection) had a significant influence on EMG normalization for the anterior deltoid and lower trapezius muscle. Results indicate that subacromial pain can influence shoulder muscle activity, especially for the deltoid muscles and lower trapezius. In addition, normalization to MVIC in the presence of pain can have unpredictable results. Caution should be taken when normalizing EMG data to MVIC in the presence of pain.

Understanding the structural basis of substrate recognition by Plasmodium falciparum plasmepsin V to aid in the design of potent inhibitors.

Plasmodium falciparum plasmepsin V (PfPMV) is an essential aspartic protease required for parasite survival, thus, considered as a potential drug target. This study reports the first detailed structural analysis and molecular dynamics simulation of PfPMV as an apoenzyme and its complexes with the substrate PEXEL as well as with the inhibitor saquinavir. The presence of pro-peptide in PfPMV may not structurally hinder the formation of a functionally competent catalytic active site. The structure of PfPMV-PEXEL complex shows that the unique positions of Glu179 and Gln222 are responsible for providing the specificity of PEXEL substrate with arginine at P3 position. The structural analysis also reveals that the S4 binding pocket in PfPMV is occupied by Ile94, Ala98, Phe370 and Tyr472, and therefore, does not allow binding of pepstatin, a potent inhibitor of most pepsin-like aspartic proteases. Among the screened inhibitors, the HIV-1 protease inhibitors and KNI compounds have higher binding affinities for PfPMV with saquinavir having the highest value. The presence of a flexible group at P2 and a bulky hydrophobic group at P3 position of the inhibitor is preferred in the PfPMV substrate binding pocket. Results from the present study will aid in the design of potent inhibitors of PMV.

Genetic Mapping of Millions of SNPs in Safflower (Carthamus tinctorius L.) via Whole-Genome Resequencing.

Accurate assembly of complete genomes is facilitated by very high density genetic maps. We performed low-coverage, whole-genome shotgun sequencing on 96 F6 recombinant inbred lines (RILs) of a cross between safflower (Carthamus tinctorius L.) and its wild progenitor (C. palaestinus Eig). We also produced a draft genome assembly of C. tinctorius covering 866 million bp (∼two-thirds) of the expected 1.35 Gbp genome after sequencing a single, short insert library to ∼21 × depth. Sequence reads from the RILs were mapped to this genome assembly to facilitate SNP identification, and the resulting polymorphisms were used to construct a genetic map. The resulting map included 2,008,196 genetically located SNPs in 1178 unique positions. A total of 57,270 scaffolds, each containing five or more mapped SNPs, were anchored to the map. This resulted in the assignment of sequence covering 14% of the expected genome length to a genetic position. Comparison of this safflower map to genetic maps of sunflower and lettuce revealed numerous chromosomal rearrangements, and the resulting patterns were consistent with a whole-genome duplication event in the lineage leading to sunflower. This sequence-based genetic map provides a powerful tool for the assembly of a low-cost draft genome of safflower, and the same general approach is expected to work for other species.

Using community-based participatory research to address Chinese older women’s health needs: Toward sustainability

ABSTRACTAlthough community-based participatory research (CBPR) has been recognized as a useful approach for eliminating health disparities, less attention is given to how CBPR projects may address gender inequalities in health for immigrant older women. The goal of this article is to share culturally sensitive strategies and lessons learned from the PINE study—a population-based study of U.S. Chinese older adults that was strictly guided by the CBPR approach. Working with Chinese older women requires trust, respect, and understanding of their unique historical, social, and cultural positions. We also discuss implications for developing impact-driven research partnerships that meet the needs of this vulnerable population.

Exploiting genotyping by sequencing to characterize the genomic structure of the American cranberry through high-density linkage mapping.

BackgroundThe application of genotyping by sequencing (GBS) approaches, combined with data imputation methodologies, is narrowing the genetic knowledge gap between major and understudied, minor crops. GBS is an excellent tool to characterize the genomic structure of recently domesticated (~200 years) and understudied species, such as cranberry (Vaccinium macrocarpon Ait.), by generating large numbers of markers for genomic studies such as genetic mapping.ResultsWe identified 10842 potentially mappable single nucleotide polymorphisms (SNPs) in a cranberry pseudo-testcross population wherein 5477 SNPs and 211 short sequence repeats (SSRs) were used to construct a high density linkage map in cranberry of which a total of 4849 markers were mapped. Recombination frequency, linkage disequilibrium (LD), and segregation distortion at the genomic level in the parental and integrated linkage maps were characterized for first time in cranberry. SSR markers, used as the backbone in the map, revealed high collinearity with previously published linkage maps. The 4849 point map consisted of twelve linkage groups spanning 1112 cM, which anchored 2381 nuclear scaffolds accounting for ~13 Mb of the estimated 470 Mb cranberry genome. Bin mapping identified 592 and 672 unique bins in the parentals and a total of 1676 unique marker positions in the integrated map. Synteny analyses comparing the order of anchored cranberry scaffolds to their homologous positions in kiwifruit, grape, and coffee genomes provided initial evidence of homology between cranberry and closely related species.ConclusionsGBS data was used to rapidly saturate the cranberry genome with markers in a pseudo-testcross population. Collinearity between the present saturated genetic map and previous cranberry SSR maps suggests that the SNP locations represent accurate marker order and chromosome structure of the cranberry genome. SNPs greatly improved current marker genome coverage, which allowed for genome-wide structure investigations such as segregation distortion, recombination, linkage disequilibrium, and synteny analyses. In the future, GBS can be used to accelerate cranberry molecular breeding through QTL mapping and genome-wide association studies (GWAS).Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-016-2802-3) contains supplementary material, which is available to authorized users.

Investigation of Fluorophosphate Cathode Materials for Na Ion Batteries By Ex Situ 23 Na Solid-State Nuclear Magnetic Resonance

Sodium ion batteries have experienced a renaissance in recent years owing to the low cost and high abundance of sodium relative to lithium resources.1 Despite this renewed attention, there remains a need to realize sodium electrode materials that are suitable for commercial applications. In light of this, there is significant motivation to identify and analyze various properties of novel electrode materials, including structural and ion diffusion changes that occur during the electrochemical cycling process. Solid-state nuclear magnetic resonance (ssNMR) is implemented here in an attempt to characterize structure and site-specific ion mobility in the fluorophosphate family of cathode materials (Na2MPO4F), as they are known to exhibit high thermal and electrochemical stability.2,3 Ex situ 23Na NMR studies at fast magic angle spinning (65 kHz) allow for sufficient spectral resolution to observe local changes at unique Na environments in these paramagnetic electrode materials. Na atoms housed in the two crystallographically unique positions in the layered Na2FePO4F phase are distinguishable via this technique (Figure 1a), offering the opportunity to probe local properties in the pristine phase. Further, by incorporation of this material into a sodium ion cell, the changes to the 23Na NMR spectrum can be correlated ex situ to structural changes directly resulting from the electrochemical (de)intercalation process. The appearance and relative increase of two new Na peaks in the NMR spectrum (Figure 1b) upon electrochemical desodiation of the material suggests that Na atoms in both crystallographic environments may in fact be mobile despite an apparent lack of chemical exchange between sites. These new Na resonances can be assigned to the partially oxidized variant of the pristine material, where the dramatic shift in peaks in the NMR spectrum is attributed to the change in electron configuration of the transition metal from Fe2+ to Fe3+. Ongoing efforts to quantify the diffusion of Na ions and characterize the mechanism of electrochemical desodiation will be presented.

A High-Resolution SNP Array-Based Linkage Map Anchors a New Domestic Cat Draft Genome Assembly and Provides Detailed Patterns of Recombination.

High-resolution genetic and physical maps are invaluable tools for building accurate genome assemblies, and interpreting results of genome-wide association studies (GWAS). Previous genetic and physical maps anchored good quality draft assemblies of the domestic cat genome, enabling the discovery of numerous genes underlying hereditary disease and phenotypes of interest to the biomedical science and breeding communities. However, these maps lacked sufficient marker density to order thousands of shorter scaffolds in earlier assemblies, which instead relied heavily on comparative mapping with related species. A high-resolution map would aid in validating and ordering chromosome scaffolds from existing and new genome assemblies. Here, we describe a high-resolution genetic linkage map of the domestic cat genome based on genotyping 453 domestic cats from several multi-generational pedigrees on the Illumina 63K SNP array. The final maps include 58,055 SNP markers placed relative to 6637 markers with unique positions, distributed across all autosomes and the X chromosome. Our final sex-averaged maps span a total autosomal length of 4464 cM, the longest described linkage map for any mammal, confirming length estimates from a previous microsatellite-based map. The linkage map was used to order and orient the scaffolds from a substantially more contiguous domestic cat genome assembly (Felis catus v8.0), which incorporated ∼20 × coverage of Illumina fragment reads. The new genome assembly shows substantial improvements in contiguity, with a nearly fourfold increase in N50 scaffold size to 18 Mb. We use this map to report probable structural errors in previous maps and assemblies, and to describe features of the recombination landscape, including a massive (∼50 Mb) recombination desert (of virtually zero recombination) on the X chromosome that parallels a similar desert on the porcine X chromosome in both size and physical location.

Evolution and Distribution of Teleost myomiRNAs: Functionally Diversified myomiRs in Teleosts.

Myosin heavy chain (MYH) genes belong to a multigene family, and the regulated expression of each member determines the physiological and contractile muscle properties. Among these, MYH6, MYH7, and MYH14 occupy unique positions in the mammalian MYH gene family because of their specific expression in slow/cardiac muscles and the existence of intronic micro(mi) RNAs. MYH6, MYH7, and MYH14 encode miR-208a, miR-208b, and miR-499, respectively. These MYH encoded miRNAs are designated as myomiRs because of their muscle-specific expression and functions. In mammals, myomiRs and host MYHs form a transcription network involved in muscle fiber-type specification; thus, genomic positions and expression patterns of them are well conserved. However, our previous studies revealed divergent distribution and expression of MYH14/miR-499 among teleosts, suggesting the unique evolution of myomiRs and host MYHs in teleosts. Here, we examined distribution and expression of myomiRs and host MYHs in various teleost species. The major cardiac MYH isoforms in teleosts are an intronless gene, atrial myosin heavy chain (amhc), and ventricular myosin heavy chain (vmhc) gene that encodes an intronic miRNA, miR-736. Phylogenetic analysis revealed that vmhc/miR-736 is a teleost-specific myomiR that differed from tetrapoda MYH6/MYH7/miR-208s. Teleost genomes also contain species-specific orthologs in addition to vmhc and amhc, indicating complex gene duplication and gene loss events during teleost evolution. In medaka and torafugu, miR-499 was highly expressed in slow/cardiac muscles whereas the expression of miR-736 was quite low and not muscle specific. These results suggest functional diversification of myomiRs in teleost with the diversification of host MYHs.

Program Directors’ Perceptions of School Counselor Roles

School counseling program directors hold unique positions as both administrators and school counselors. Research to date has not explored the status of professional school counseling from the perspective of school district level counseling leadership. This phenomenological study reveals insights of eight district level program directors regarding professional challenges and opportunities in school counseling. An overarching theme of moving school counselors from diluted to ideal roles emerged with additional themes of school counselor identity, advocacy, targeted professional development, and synergistic collaboration represented in a working model. Implications for counselor educators, school administrators, school counselors, and school counseling directors are provided.

Superlubricity in quasicrystalline twisted bilayer graphene

The unique atomic positions in quasicrystals lead to peculiar self-similarity and fractal-like structural morphology. Accordingly, many of the material properties are supposed to manifest exceptional characteristics. In this Rapid Communication, we explain through numerical simulations the fundamental and peculiar aspects of quasicrystals wearless friction manifested in a 30\ifmmode^\circ\else\textdegree\fi{} twisted bilayer graphene system. In particular, the sliding force exhibits a fractal structure with distinct area correlations due to the natural mixture between both periodic and aperiodic lateral modulations. In addition, zero power scaling of the sliding force with respect to the contact area is demonstrated for a geometric sequence of dodecagonal elements.