Search

Perfluoroalkyls acids (PFAAs) have been emitted in the environment either as manufacturing by products or through degradation of its precursors. Development of efficient identification and quantification of PFAAs in different environmental media is important for environmental and human health risk assessments. In this study, different extraction methods were developed to determine nine (9) different PFAAs in seawater and seawater sandworm Perinereis wilsoni. P. wilsoni extracted using two methods: manual extraction and accelerated solvent extraction (ASE). Solid phase extraction method was used for the clean-up and preconcentration of PFAAs from the marine water samples. High-performace liquid chromatography–tandem mass spectrometry was used to analyze PFAAs concentrations in the samples. Percent recoveries of surrogate (SUR) in marine water samples were between 52 to 72% (blank), 52 to 88% (1 ng), and 56 to 79% (10 ng). Manual extraction of sandworm resulted in 57 to 93% recovery of SUR compounds. ASE extraction gave higher recoveries of SUR compounds (62 to 92%). The developed analytical methods for seawater and sandworm extraction can assure production of good quality PFAAs data.

Funding: A.N. Wright’s participation was through a program sponsored through the International Space Science Institute, and was partially funded by the Science and Technology Facilities Councils (STFC) Grant (ST/N000609/1). We present an example of one-to-one correspondence between poleward moving auroral arcs (PMAAs) and Pc5 oscillations observed at the Time History of Events and Macroscale Interactions during Substorms (THEMIS) Ground Based Observatory station Gillam. The PMAAs consisted of four successive intensifications (named PMAA1, PMAA2, PMAA3 and PMAA4) with a period of 3∼4 min over the magnetic latitudes from 68° to 70° in the auroral oval and varied coherently with the H-component of magnetic field Pc5 oscillations. PMAA1 and PMAA2 appeared clearly at the magnetic latitude ∼69°, and the following two PMAAs, which were dimmer, appeared at the magnetic latitude ∼68°. PMAA1 and PMAA2 exhibited features of field-line resonances (FLRs) with the maximum luminosity at the magnetic latitude ∼69.5° and ∼69.4°, respectively. The ground Pc5 oscillations were concurrent with toroidal mode Pc5 oscillation observed at the THEMIS-D, -E, and -A satellites at ∼4 MLT in the outer magnetosphere. The magnetic and electric field oscillations at THEMIS were synchronized with the PMAAs. The magnetic energy of the THEMIS Pc5 oscillations is estimated using a numerical model of damped toroidal oscillations and compared with the kinetic energy of precipitating electrons associated with the field aligned current (FAC) carried by the toroidal oscillations. The result reveals that the Pc5 magnetic energy is much larger than the kinetic energy, implying the magnetic energy is important for producing auroral emissions in the ionosphere. We also perform a simulation of the relationship between PMAAs and toroidal mode Pc5 oscillations. The simulation explains the observed spatial and temporal structures of the PMAAs. Publisher PDF

Background/Objectives The Japan-multimodal intervention trial for prevention of dementia (J-MINT) is intended to verify the effectiveness of multi-domain interventions and to clarify the mechanism of cognitive improvement and deterioration by carrying out assessment of dementia-related biomarkers, omics analysis and brain imaging analysis among older adults at high risk of dementia. Moreover, the J-MINT trial collaborates with partnering private enterprises in the implementation of relevant interventional measures. This manuscript describes the study protocol. Design/Setting Eighteen-month, multi-centered, randomized controlled trial. Participants We plan to recruit 500 older adults aged 65–85 years with mild cognitive impairment. Subjects will be centrally randomized into intervention and control groups at a 1:1 allocation ratio using the dynamic allocation method with all subjects stratified by age, sex, and cognition. Intervention The multi-domain intervention program includes: (1) management of vascular risk factors; (2) group-based physical exercise and self-monitoring of physical activity; (3) nutritional counseling; and (4) cognitive training. Health-related information will be provided to the control group every two months. Measurements The primary and secondary outcomes will be assessed at baseline, 6-, 12-, and 18-month follow-up. The primary outcome is the change from baseline to 18 months in a global composite score combining several neuropsychological domains. Secondary outcomes include: cognitive change in each neuropsychological test, incident dementia, changes in blood and dementia-related biomarkers, changes in geriatric assessment including activities of daily living, frailty status and neuroimaging, and number of medications taken. Conclusions This trial that enlist the support of private enterprises will lead to the creation of new services for dementia prevention as well as to verify the effectiveness of multi-domain interventions for dementia prevention. Electronic Supplementary Material Supplementary material is available for this article at 10.14283/jpad.2021.29 and is accessible for authorized users.

The National Institutes for Quantum Science and Technology (QST) has been developing new cryogenic structural materials, such as JJ1 stainless, and nitrogen-enhanced 316L stainless, known as 316LN, since the 1980s for increased tensile strength to comply with the ITER requirements. QST has also developed prediction curves for yield stress and tensile strength at temperatures from room temperature to 4 K based on the actual properties of these materials at room temperature to reduce the number of tensile tests conducted at 4 K, which are costly. After material trials and qualifications, the manufacture of material candidates began in earnest from 2012. In total, over 2400 materials (over 5000 tonne) were manufactured by six fabricators until manufacturing was completed successfully in 2020. The material properties of each material candidate were evaluated by QST and added into a database registry. Sampling tests, e.g., tensile tests were conducted at 4 K and 77 K. The correlations between the mechanical and material properties were evaluated to optimize material specifications of future superconducting magnets. The accuracy of QST’s prediction curves was also confirmed. This paper summarizes the evaluation of the material properties and the prediction accuracy of mass-produced materials for the ITER toroidal field coil cases.

The association of sarcopenia with cognitive function in its specific domains remains poorly understood.To investigate the association of sarcopenia and its components with neuropsychological performance among patients with mild cognitive impairment (MCI) and Alzheimer's disease (AD).Cross-sectional design.A memory clinic in Japan.The study included 497 MCI/684 AD patients aged 65-89 years.Patients were assessed for muscle mass by bioelectrical impedance analysis, muscle strength by hand grip strength (HGS), and physical performance by timed up and go test (TUG). Sarcopenia was defined as presence of both low muscle strength and low muscle mass. The patients underwent neuropsychological tests, including logical memory, frontal lobe assessment battery, word fluency test, Raven's colored progressive matrices, digit span, and the Alzheimer's disease assessment scale-cognitive subscale (ADAS-cog).The prevalence of sarcopenia in men and women was 24.1% and 19.5%, respectively. In multiple regression analyses adjusting for confounders, unlike in men, sarcopenia was associated with memory function in women (ADAS-cog, memory domain, coefficient = 1.08, standard error (SE) = 0.36), which was thought likely due to the relationship between HGS and memory function (immediate recall of logical memory, coefficient = 0.07, SE = 0.03; ADAS-cog, memory domain, coefficient = -0.10, SE = 0.03). Of the components of sarcopenia in both sexes, HGS and TUG were associated with visuospatial function and frontal lobe function, respectively.The specific association of sarcopenia and its components with cognitive domains may provide the key to elucidating the muscle-brain interactions in AD.

Background Aging‐related degeneration of elastic fibres causes skin wrinkles and loss of elasticity. A correlation has been reported between dermal elastic fibre degradation and wrinkles. However, the mechanism of wrinkle formation is complex and unclear. To establish methods for treating wrinkles, it is necessary to understand the aging‐related morphological alterations underlying elastin fibre degradation or disappearance. Objectives To image and analyse aging‐related three‐dimensional (3D) morphological alterations of elastic fibres in the eyelid and abdominal skin. Methods Excised human eyelid and abdominal skin tissues were examined. The structure of elastic fibres in the skin tissues was examined via nuclear, tropoelastin and fibrillin‐1 immunostaining. Then, 3D imaging was performed using a confocal laser microscope and tissue decolourization technology. Images were analysed using a computational method. Results The decolourization technology made it possible to image elastin fibres in 3D, and we devised a method for analyzing the elastin fibre structure using computational methods. It was quantitatively shown that the eyelid skin has a more complex fibrous structure than the abdomen, and the fibres became curved, shortened and thickened with age. Conclusions We provide a novel 3D analysis method for elastin fibres and report age‐related alterations in elastin fibre structure in the human eyelid and abdominal skin. This method contributes to the understanding of elastin fibre degeneration in more detail than conventional methods. Applying this 3D analysis method to skin tissues will contribute to a better understanding of age‐related changes in fibres and to the development of novel wrinkle treatments.

Background: Nipple-sparing mastectomy (NSM) is an increasingly popular surgical procedure for treatment of breast cancer. However, NSM is controversial because of its association with locoregional recurrence. We started performing NSM in 1978. Methods: We investigated the surgical safety including nipple necrosis, and nipple–areola recurrence (NAR) and skin flap recurrence (SFR) after NSM for 1071 patients with breast cancer, including 31 with stage 0, 414 with stage 1, 479 with stage 2, 141 with stage 3 and 6 with stage 4, from 1985 to 2017. Our NSM method involved creating a thick skin flap to avoid surgical complications. No patients received radiotherapy. In 1034 patients with stage 1–3 breast cancer treated with NSM who developed NAR or SFR, we evaluated cancer stage, nuclear grade, lymph node metastasis, tumor–nipple–areola distance, and histological classification as tubule forming, solid and scirrhous type. In 748 patients with early stage 1 and 2A breast cancer treated with NSM, NAR and SFR were evaluated for estrogen receptor and HER2 expression. We evaluated disease-free interval and frequency of late NAR and SFR. Results: Median follow-up after NSM was 87 (3–397) months. There was only one case of total nipple necrosis among all 1071 patients. There were 96 patients (9.0%) with local recurrence, including 44 (4.0%) with NAR and 52 (4.8%) with SFR. NAR was seen in 1 (3.1%), 14 (3.4%), 17 (5.1%), 5 (3.4%), 7 (5.0%) and 0 patients with stage 0, 1, 2A, 2B, 3 and 4 cancer, respectively. SFR was seen in 0, 15 (3.6%), 8 (2.7%), 7 (4.8%), 22 (15.6%) and 0 patients with stage 0, 1, 2A, 2B, 3 and 4 cancer, respectively. Median disease-free interval of NAR and SFR was 3.4 (0.96–22.3) and 2.5 (0.21–21.2) years, respectively. Twenty-three (53%), 12 (27.9%) and 6 (14%) patients had NAR at more than 3, 5 and 10 years after NSM, respectively. Twenty (38%), 13 (25%) and 6 (11.5%) patients had SFR at more than 3, 5 and 10 years after NSM, respectively. Therefore, late NAR and SFR were observed. Patients with stage 1–3 cancer treated with NSM who had significantly more frequent NAR, were characterized by high nuclear grade and tubule-forming type cancer. Patients with significantly more frequent SFR were characterized by stage 3 cancer, positive lymph node metastasis and age ≤40 years. Patients with early stage breast cancer treated with NSM with significantly more frequent NAR had negative estrogen receptor expression, positive HER2 expression and shorter tumor–nipple–areola distance (≤2 cm). Overall survival was significantly better in patients with NAR (97% at 5 years and 80% at 10 years) than SFR (71% at 5 years and 50% at 10 years). Regarding SFR, overall survival was significantly worse for multiple (≥2) and diffuse (clinical inflammatory syndrome) recurrence than for single-nodule recurrence. There was no significant difference in prognosis between NAR and single-nodule SFR. Conclusions: Our data showed that clinicopathological features and prognosis differed between patients with NAR and SFR. There was no significant difference in prognosis between NAR and single-nodule SFR. Late NAR and SFR were seen, and careful long-term follow-up observation is necessary after NSM. Citation Format: Sakurai T, Suzuma T, Yoshimura G, Sasaki E, Umemura T, Sakurai T. Clinicopathological features and prognosis of nipple–areola and skin flap recurrence after nipple-sparing mastectomy for breast cancer over 20 years [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P2-14-08.

We present here a study of the magnetic properties of the antiferromagnetic dimer material CuVOF$_4$(H$_2$O)$_6\cdot$H$_2$O, in which the dimer unit is composed of two different $S = 1/2$ species, Cu(II) and V(IV). An applied magnetic field of $\mu_0H_{\rm c1} = 13.1(1)~\rm T$ is found to close the singlet-triplet energy gap, the magnitude of which is governed by the antiferromagnetic intradimer, $J_0 \approx 21~\rm K$, and interdimer, $J' \approx 1~\rm K$, exchange energies, determined from magnetometry and electron-spin resonance measurements. The results of density functional theory (DFT) calculations are consistent with the experimental results and predicts antiferromagnetic coupling along all nearest-neighbor bonds, with the magnetic ground state comprising spins of different species aligning antiparallel to one another, while spins of the same species are aligned parallel. The magnetism in this system cannot be accurately described by the overlap between localized V orbitals and magnetic Cu orbitals lying in the Jahn-Teller (JT) plane, with a tight-binding model based on such a set of orbitals incorrectly predicting that interdimer exchange should be dominant. DFT calculations indicate significant spin density on the bridging oxide, suggesting instead an unusual mechanism in which intradimer exchange is mediated through the O atom on the Cu(II) JT axis., Comment: Main - 12 pages, 11 figures. Supplemental Information - 11 pages, 11 figures; V2 - Corrected typo in author list

In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting supermassive black hole of mass ∼6.5 × 109 M o˙. The EHTC also partnered with several international facilities in space and on the ground, to arrange an extensive, quasi-simultaneous multi-wavelength campaign. This Letter presents the results and analysis of this campaign, as well as the multi-wavelength data as a legacy data repository. We captured M87 in a historically low state, and the core flux dominates over HST-1 at high energies, making it possible to combine core flux constraints with the more spatially precise very long baseline interferometry data. We present the most complete simultaneous multi-wavelength spectrum of the active nucleus to date, and discuss the complexity and caveats of combining data from different spatial scales into one broadband spectrum. We apply two heuristic, isotropic leptonic single-zone models to provide insight into the basic source properties, but conclude that a structured jet is necessary to explain M87's spectrum. We can exclude that the simultaneous γ-ray emission is produced via inverse Compton emission in the same region producing the EHT mm-band emission, and further conclude that the γ-rays can only be produced in the inner jets (inward of HST-1) if there are strongly particle-dominated regions. Direct synchrotron emission from accelerated protons and secondaries cannot yet be excluded. © 2021. The Author(s). Published by the American Astronomical Society..

We have prepared polycrystalline samples of RE2Au3Sn6 (RE = Ce, La) and investigated their magnetic, transport and thermal properties. We found that Ce2Au3Sn6 shows antiferromagnetic transition at T N = 2.54 K, while La2Au3Sn6 shows no phase transition above 0.4 K. The electronic specific heat coefficient of Ce2Au3Sn6 is γ = 350 mJ Ce-mol K2, which indicates that Ce2Au3Sn6 is a heavy fermion compound. The magnetic entropy of Ce2Au3Sn6 at T N is estimated to be 70% of Rln2, which can be attributed to the shielding of the magnetic moment by the Kondo effect.

Magnetic and transport properties of a new cubic compound CeMgZn2 have been examined by measuring the magnetic susceptibility, the magnetization, the electrical resistivity, and the specific heat. CeMgZn2 is a Kondo-lattice compound with trivalent Ce ions. The magnetic susceptibility measured at 0.1 T exhibits a shoulder and a cusp at T N1 = 5.4 K and T N2 = 3.1 K, respectively. T N1 and T N2 correspond to the antiferromagnetic-transition temperatures since these temperatures decrease with increasing magnetic field. The large value of the paramagnetic Curie temperature divided by T N1 (13.5) implies that T N1 is suppressed by geometrical frustration on a face-centered cubic Ce sublattice. The geometrical frustration may also be responsible for the appearance of many magnetic phases in magnetic fields.

Magnetic, transport, and thermal properties of new orthorhombic compounds Ce4Pt9Al13 and Ce4Pt9Al13 have been investigated by the magnetization, the electrical resistivity, and the specific-heat measurements. Ce4Pt9Al13 is a Kondo-lattice compound and shows a ferromagnetic or ferrimagnetic transition at T C = 0.88 K. Pr4Pt9Al13 is an antiferromagnetic compound with the transition temperature at T N = 2.6 K.

We have synthesized polycrystalline samples of a new orthorhombic compound Ce2lr3Sb4 and investigated their physical properties by measuring the magnetization, the electrical resistivity, and the specific heat down to 0.4 K. From the results of electrical resistivity measurements, it was found that Ce2Ir3Sb4 is a Kondo lattice compound. We found that Ce2Ir3Sb4 does not show any phase transition down to 0.4 K. The specific heat peak at 1.3 K is not due to a phase transition but due to the Schottky specific heat caused by the crystalline electric field splitting of the 4f level of Ce ions.

We have synthesized polycrystalline samples of CePtAl2 by arc melting method and examined their magnetic, transport and thermal properties by measuring the magnetization, the electrical resistivity, and the specific heat down to 0.4 K. As a result of these measurements, we found that CePtAl2 is a ferromagnetic Ce-based compound with the Curie-temperature Tc = 2.7 K.

We have fabricated and investigated the optical properties of highly lattice mismatched AlInSb thermophotovoltaic cells grown on GaAs substrates. Defects, such as dislocations and surface damage, were minimized by controlling the strain of the film structure and by using a silicon nitride passivation layer. An output power density of 9.7 mW cm−2 was achieved under 1000 °C blackbody radiation with an incident power density of 1.63 W cm−2, which gave a power conversion efficiency of 0.59 %. Optimal efficiency of above 5% was estimated by a simulation using recombination parameters obtained from electroluminescence analysis. Additionally, a six-fold increase in spectral efficiency was confirmed by using a 3.3 μm monochromatic light source, which indicated that a thermophotovoltaic cell with a high efficiency of more than 30% would be possible in combination with wavelength-selective emitter.

Frankliniella cephalica (Crawford) is an invasive species of thrips found in the islands of Yaeyama in the Okinawa Prefecture, Japan. During the late 1990s to early 2000s, a species of thrips was isolated from wild flowers of Bidens pilosa L. and Ipomoea batatas L. growing close to cultivated fields. They were subsequently identified as F. cephalica using fine morphological characteristics with the help of Steve Nakahara (U.S. Department of Agriculture, Beltsville, MD) and Laurence Mound (CSIRO, Australia). Voucher specimens were deposited in the Laboratory of Insect Resources, Faculty of Agriculture, Tokyo University of Agriculture by Shuji Okajima (2). We investigated the ability of F. cephalica to vector Tomato spotted wilt virus (TSWV) by experimentally determining virus transmission efficiency. Newly hatched larvae as much as 12 h old underwent a viral acquisition-access period (AAP) of 24 h, during which they fed on the leaves of Datura stramonium infected with TSWV-O, a Japanese type isolate. Transmission efficiency of adults 4 days after emergence from molt (14 days after the AAP) was determined by a petunia leaf disk assay (3) in which the adults were individually allowed to feed for successive 24-h inoculation access periods (IAP) on two different leaf disks of Petunia × hybrida cv. Polo Blue. Transmission of the virus by the adults was considered positive if at least one of the leaf disks showed viral necrotic spot. We tested 20 randomly selected leaf disks with clear necrotic spots using a simplified rapid immunofilter paper assay. All selected disks were positive for TWSV. The transmission efficiencies were 24.6% for female (n = 57) and 54.4% for male (n = 125) adults. The efficiency was significantly different between sexes (Fisher's exact probability test, P < 0.001). We also examined changes in the virus infection site at different developmental stages in thrips using immunofluorescence microscopy with a polyclonal antibody to N protein of the virus (4). After a 6-h AAP feeding by first instar larvae, the virus was found initially to infect the epithelial cells and then spread throughout the midgut tissue in the second instar larvae 5 days after acquisition of the virus. In viruliferous adults, the virus was present in the salivary glands and on the basement membrane of the midgut tissue. These data indicate that F. cephalica is a new insect vector for TSWV. F. cephalica is a major insect pest of tropical crops in tropical and subtropical coastal belts (1). The presence of a thrips vector in weed hosts surrounding cultivated fields might increase the chance of crops in this habitat becoming infected with viruses. References: (1) M. Lamberts and J. H. Crane. Page 337 in: Advances in New Crops. J. Janick and J. E. Simon, eds. Timber Press, Portland, OR, 1990. (2) M. Masumoto and S. Okajima. Jpn. J. Appl. Entomol. Zool. 48:225, 2004. (3) T. Sakurai et al. Appl. Entomol. Zool. 39:71, 2004. (4) S. Tsuda et al. Ann. Phytopathol. Soc. Jpn. 60:216, 1994.

A semiconductor device including a substrate having a low substrate surface formed in the substrate with a first gentle slope from the substrate surface; a single crystalline layer formed on the low substrate surface nearly level with the substrate surface and having a gentle slope facing the first gentle slope; an optical semiconductor element is constructed using the single crystalline layer. An electronic semiconductor element is constructed using the substrate surface. A wiring layer connects electrodes of the optical semiconductor element and the electronic semiconductor element through the first and the second gentle slopes.

Introduction: Achievement of a good cosmetic outcome is one of the most important goals of surgical treatment of breast cancer. However, most patients must undergo a mastectomy if the outcome of breast-conserving surgery is discordant. All potential techniques that maintain oncological safety should be considered to maximize the cosmetic outcome for patients who require a mastectomy. We began performing nipple-sparing mastectomy (NSM) in 1978. Recent reports have suggested that NSM is oncologically as safe as mastectomy and affords a better cosmetic outcome. Conversely, the surgical complications and recurrence associated with NSM remain controversial. Objective: In the present study, we review the safety of the NSM surgical technique, discuss nipple–areola recurrence and skin flap recurrence after NSM, and compare recurrence and prognosis between NSM and mastectomy based on our long-term follow-up data. Patients and Methods: We retrospectively analyzed 723 patients with early-stage breast cancer who underwent NSM from 1985 to 2007. The patients' median age, tumor size, and tumor–areola distance were 50 y, 2.1 cm, and 1.5 cm, respectively. We used a thick skin flap method to avoid surgical complications including nipple and skin flap necrosis. We analyzed nipple–areola recurrence and skin flap recurrence after NSM. We also analyzed 100 patients who underwent mastectomy for early-stage breast cancer during the same period as those who underwent NSM. We compared the local recurrence rate (LRR), disease-free survival (DFS) rate, and overall survival (OS) rate among all 723 patients who underwent NSM and 100 patients who underwent mastectomy. No patients in either group received radiotherapy. Results: Among all patients who underwent NSM, stage 0, 1, 2A, and 2B disease was present in 21, 320, 253, and 129 patients, respectively. Notably, no nipple necrosis occurred during the average 114-month follow-up period. Local recurrence developed in 49 patients (6.7%), including recurrence at the nipple–areola complex in 24 (3.3%) and recurrence at the skin flap in 25 (3.4%). The average disease-free interval in patients with nipple–areola recurrence was 50 months, and that in patients with skin flap recurrence was 68 months. The clinical features of nipple–areola recurrence were a low rate of ER positivity (27%), high rate of Her2/neu positivity (60%), Paget type recurrence rate of 52%, and small tumor–areola distance (0.5 cm). The clinical features of skin flap recurrence were a relatively high rate of ER positivity (55%), solitary type recurrence rate of 88%, and diffuse type recurrence rate of 12%. The prognosis of diffuse type skin flap recurrence was significantly worse than that of solitary type recurrence (p = 0.01). There were no significant differences between the NSM and mastectomy groups in the LLR (6.7% vs. 4.0%, respectively), 10-y DFS rate (88% vs. 90%, respectively), or 10-y OS rate (92% vs. 91%, respectively). Conclusion: Our long-term follow-up data show that NSM should be considered as an alternative option for mastectomy when the outcome of breast-conserving surgery is discordant in patients with early-stage breast cancer. Citation Format: Sakurai T, Suzuma T, Yoshimura G, Jinta E, Umemura T, Sakurai T. Long-term follow-up of nipple-sparing mastectomy for early-stage breast cancer without radiotherapy: A single-center study at a Japanese institution. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P2-12-09.