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https://www.readbyqxmd.com/read/27922069/formation-mechanism-of-ruddlesden-popper-type-antiphase-boundaries-during-the-kinetically-limited-growth-of-sr-rich-srtio3-thin-films
#1
Chencheng Xu, Hongchu Du, Alexander J H van der Torren, Jan Aarts, Chun-Lin Jia, Regina Dittmann
We elucidated the formation process for Ruddlesden-Popper-type defects during pulsed laser deposition of Sr rich SrTiO3 thin films by a combined analysis of in-situ atomic force microscopy, low energy electron diffraction and high resolution scanning transmission electron microscopy. At the early growth stage of 1.5 unit cells, the excess Sr results in the formation of SrO on the surface, resulting in a local termination change from TiO2 to SrO, thereby forming a Sr rich (2 × 2) surface reconstruction...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921326/correlation-of-genetic-results-with-testicular-histology-hormones-and-sperm-retrieval-in-nonobstructive-azoospermia-patients-with-testis-biopsy
#2
W Liu, X Gao, G Ma, L Yan, T Chen, T Li, R-M Yu, J-L Ma
To investigate the frequency and types of genetic results in different testicular histology of patients with nonobstructive azoospermia (NOA), and correlated with hormones and sperm retrieval (SR), a retrospective study was conducted in 286 Chinese NOA patients who underwent testis biopsy and 100 age-matched fertile men as the control group. Chromosome karyotype analyses were performed by the peripheral blood chromosome G-band detection method. Screening of Y chromosome microdeletions of azoospermia factor (AZF) region was performed by polymerase chain reaction (PCR) amplification of 11 sequence-tagged sites (STS)...
December 6, 2016: Andrologia
https://www.readbyqxmd.com/read/27918015/highly-efficient-polymer-solar-cells-by-step-by-step-optimizing-donor-molecular-packing-and-acceptor-redistribution
#3
Qianqian Sun, Fujun Zhang, Qiaoshi An, Miao Zhang, Jian Wang, Jian Zhang
The dynamic drying process of the active layer should play a vitally important role in determining the performance of polymer solar cells (PSCs). Donor molecular packing and acceptor redistribution can be optimized by two successive post-treatments on the active layer. The blend films were freshly prepared by spin-coating method and then immediately transferred to a covered glass Petri dish to allow self-assembly of the donor molecules. The films were then treated with methanol or PFN-methanol solution to adjust the acceptor redistribution...
December 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27915483/factors-associated-with-sterilization-among-hiv-positive-us-women-in-an-urban-outpatient-clinic
#4
V T Raziano, A N Smoots, L B Haddad, K M Wall
This cross-sectional study sought to determine factors associated with sterilization among HIV-positive US women. HIV-positive women aged 18-45 completed an Audio Computer Assisted Self Interview (ACASI) questionnaire. Chi-square tests and multivariable logistic regression evaluated factors associated with sterilization. The median age of the 187 participants was 37, the majority had at least a high school education, and 88% were African American. Nearly a quarter (22%) of women had undergone sterilization at an average age of 25; of these women, 71% cited their HIV-positive status as an important factor in deciding to have a tubal ligation, 22% expressed desire for future children, 32% reported sterilization regret, and 20% reported feeling pressure to undergo sterilization...
December 4, 2016: AIDS Care
https://www.readbyqxmd.com/read/27914391/frequency-based-noise-coherence-function-extension-and-application-to-passive-bottom-loss-estimation
#5
Lanfranco Muzi, Martin Siderius, Peter L Nielsen
Accurate modeling of acoustic propagation in the ocean waveguide is important to SONAR-performance prediction. Particularly in shallow waters, a crucial contribution to the total transmission loss is the bottom refection loss, which can be estimated passively by beamforming the natural surface-noise acoustic field recorded by a vertical line array of hydrophones. However, the performance in this task of arrays below 2 m of length is problematic for frequencies below 10 kHz It is shown in this paper that, when the data are free of interference from sources other than wind and wave surface noise, data from a shorter array can be used to approximate the coherence function of a longer array...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914378/toward-ocean-attenuation-tomography-determining-acoustic-volume-attenuation-coefficients-in-seawater-using-eigenray-amplitudes
#6
J D Tippmann, J Sarkar, C M A Verlinden, W S Hodgkiss, W A Kuperman
A deep-water experiment in the Pacific made in situ measurements of the volume attenuation coefficients of sea water in the mid-frequency range. The frequency, temperature, salinity, pH, and pressure dependent seawater attenuation coefficients were determined using a vertical line array that received and identified over 2000 unique paths from 1200 mid-frequency 3-9 kHz LFM source transmissions at a convergence zone range and depth up to 400 m. The results show no change in attenuation coefficients in this band compared to estimates from 30-year-old models previously determined from a combination of long-range ocean acoustic and laboratory experiments...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27906391/large-area-growth-of-vertically-aligned-luminescent-mos2-nanosheets
#7
G Deokar, N S Rajput, P Vancsó, F Ravaux, M Jouiad, D Vignaud, F Cecchet, J-F Colomer
Vertically aligned MoS2 nanosheets (NSs) with exposed edges were successfully synthesized over a large area (∼2 cm(2)). The NSs were grown using an ambient pressure chemical vapor deposition technique via rapid sulfurization of sputter deposited thick molybdenum films. Extensive characterization of the grown MoS2 NSs has been carried out using high resolution scanning and transmission electron microscopy (SEM & TEM). A special care was given to the TEM lamella preparation process by means of a focused ion beam to preserve the NS growth direction...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27903364/-a-meta-analysis-of-hiv-seroprevalence-in-pregnant-women-with-syphilis-and-the-impact-of-syphilis-infection-on-mother-to-child-hiv-transmission
#8
T T Wang, Y Xu, Z Z Li, L Z Chen
Objective: To estimate HIV seroprevalence among pregnant women with syphilis and evaluate the influence of syphilis infection on mother-to-child-transmission (MTCT) of HIV by meta-analysis. Methods: We conducted a systematic literature search for 1 678 articles related to maternal syphilis and HIV infection published until October 1(st) 2015 using the PubMed, Web of Science, Chinese Web of Knowledge, Wanfang, Weipu, and SinoMed databases and evaluated the quality of each papers using the STROBE checklist, and the keywords were " pregnant women/maternal/pregnancy" , "syphilis/AIDS" , "HIV/human immunodeficiency virus" , "mother- to-child transimission/vertical transmission" ...
November 6, 2016: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/27902362/identification-and-interspecies-transmission-of-a-novel-bocaparvovirus-among-different-bat-species-in-china
#9
Susanna Kp Lau, Syed Shakeel Ahmed, Hazel C Yeung, Kenneth S M Li, Rachel Y Y Fan, Toni Y C Cheng, Jian-Piao Cai, Ming Wang, Bo-Jian Zheng, Samson S Y Wong, Patrick C Y Woo, Kwok-Yung Yuen
We report the discovery of a novel bocaparvovirus, bat bocaparvovirus (BtBoV), in one spleen, four respiratory and 61 alimentary samples from bats of six different species belonging to three families, Hipposideridae, Rhinolophidae and Vespertilionidae. BtBoV showed higher detection rate in alimentary samples of Rhinolophus sinicus (5.7%) than those of other bat species (0.43-1.59%), supporting R. sinicus as the primary reservoir and virus spill-over to accidental bat species. BtBoV peaked during lactating season of R...
October 25, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27898721/hepatitis-b-virus-infections-and-associated-factors-among-pregnant-women-attending-antenatal-care-clinic-at-deder-hospital-eastern-ethiopia
#10
Abdi Umare, Berhanu Seyoum, Tesfaye Gobena, Tamirat Haile Mariyam
BACKGROUND: Hepatitis B virus (HBV) infection is a serious public health problem worldwide. Reports have shown that 68,600 people die of HBV infection and more than 300,000 deaths due to liver cancer secondary to hepatitis B every year globally. Women who are infected with HBV can vertically transmit the infection to their infants. This study aims to determine the prevalence of HBV infection and associated factors among pregnant women. METHODS AND FINDINGS: A hospital-based cross-sectional study was conducted among pregnant women who attended antenatal care clinic (ANC) for routine pregnancy check-up between 18 March 2015 and 15 May 2015...
2016: PloS One
https://www.readbyqxmd.com/read/27897139/influence-of-electromechanical-coupling-on-optical-properties-of-ingan-quantum-dot-based-light-emitting-diodes
#11
Daniele Barettin, Matthias Auf der Maur, Aldo di Carlo, Alessandro Pecchia, Andrei F Tsatsulnikov, Alexei V Sakharov, Wsevolod V Lundin, Andrei E Nikolaev, Sergey O Usov, Nikolay Cherkashin, Martin J Hÿtch, Sergey Yu Karpov
The impact of electromechanical coupling on optical properties of light-emitting diodes (LEDs) with InGaN/GaN quantum-dot (QD) active regions is studied by numerical simulations. The structure, i.e. the shape and the average In content of the QDs, has been directly derived from experimental data on out-of-plane strain distribution obtained from the geometric-phase analysis of a high-resolution transmission electron microscopy image of an LED structure grown by metalorganic vapor-phase epitaxy. Using continuum [Formula: see text] calculations, we have studied first the lateral and full electromechanical coupling between the QDs in the active region and its impact on the emission spectrum of a single QD located in the center of the region...
January 6, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27896287/enamel-ribbons-surface-nodules-and-octacalcium-phosphate-in-c57bl-6-amelx-mice-and-amelx-lyonization
#12
Yuanyuan Hu, Charles E Smith, Zhonghou Cai, Lorenza A-J Donnelly, Jie Yang, Jan C-C Hu, James P Simmer
BACKGROUND: Amelogenin is required for normal enamel formation and is the most abundant protein in developing enamel. METHODS: Amelx(+/+), Amelx(+/-) , and Amelx(-/-) molars and incisors from C57BL/6 mice were characterized using RT-PCR, Western blotting, dissecting and light microscopy, immunohistochemistry (IHC), transmission electron microscopy (TEM), scanning electron microscopy (SEM), backscattered SEM (bSEM), nanohardness testing, and X-ray diffraction. RESULTS: No amelogenin protein was detected by Western blot analyses of enamel extracts from Amelx(-/-) mice...
November 2016: Molecular Genetics & Genomic Medicine
https://www.readbyqxmd.com/read/27890948/study-of-infections-among-human-immunodeficiency-virus-acquired-immunodeficiency-syndrome-patients-in-shadan-hospital-telangana-india
#13
Sukumar Gajjala Reddy, Syed Yousuf Ali, Azheel Khalidi
BACKGROUND: Human immunodeficiency virus (HIV) pandemicity is a major concern today as it causes greater loss of productivity than any other disease. HIV infection leads to profound immune deficiency and patients become highly susceptible to opportunistic infections (OIs). HIV epidemic in India is heterogeneous in nature, both in terms of routes of transmission as well as geographical spread. AIMS: (1) Determine prevalence of OIs among HIV-seropositive patients and their relation to CD4 count and to focus on the routes of transmission...
July 2016: Indian Journal of Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/27885058/association-between-human-immunodeficiency-virus-infection-and-arterial-stiffness-in-children
#14
Justin S Kuilder, Nikmah S Idris, Diederick E Grobbee, Michiel L Bots, Michael Mh Cheung, David Burgner, Nia Kurniati, Cuno Spm Uiterwaal
BACKGROUND: Human immunodeficiency virus infection (HIV) is associated with increased cardiovascular risk and adverse cardiovascular outcome in adults. Early recognition of changes in vascular properties might prove essential in cardiovascular prevention in HIV-infected patients. We investigated the relations between HIV infection and arterial stiffness in children. METHODS: This cross-sectional study included 51 HIV-infected and 52 healthy children (age 3.2-14...
November 24, 2016: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/27882759/-management-of-care-of-hiv-positive-pregnant-women-in-the-period-1996-2014
#15
M Mojhová, I Mikysková, M Halaška, M Staňková, H Rozsypal, J Šrámek, J Záhumenský, M Malý
OBJECTIVE: The evaluation of multidisplinary care about HIV positive pregnant women in the Czech Republic. DESIGN: Review. SETTINGS: Gynekologicko-porodnická klinika 1. LF UK a Nemocnice na Bulovce, Praha. METHODS: The vertical transmission of HIV infection from mother to fetus occurs most often during birth, still 1-2% of HIV-positive pregnant women will transfer the virus transplacenta. Due to careful screening for HIV during pregnancy, counselling, combination antiretroviral (cART) therapy, childbirth planning and its performance by C-section there appears a significant decrease of the virus transmission to the fetus, its occurrence is around 2%...
2016: Ceská Gynekologie
https://www.readbyqxmd.com/read/27879486/prospective-interventional-study-of-tenofovir-in-pregnancy-to-prevent-vertical-transmission-of-hepatitis-b-in-highly-viremic-women
#16
Pierre O Sellier, Sarah Maylin, Béatrice Berçot, Dorothée Chopin, Amanda Lopes, Guy Simoneau, John Evans, Véronique Delcey, Jean-Louis Bénifla, François Simon, Jean-François Bergmann
BACKGROUND: The risk of vertical transmission of hepatitis B virus (HBV) increases as maternal HBV DNA increase, despite serovaccination to newborns. METHODS: From 1 July 2012 to 1 January 2016, all pregnant women in Lariboisiere Hospital, Paris, France, with HBV DNA of 5 log10 IU/ml and above were administered tenofovir from week 28 of pregnancy until delivery. HBV DNA was measured at months 1, 2 of tenofovir and at delivery. The newborns were serovaccinated, tested for hepatitis B surface antigen, hepatitis B core antibody (HBcAb)±HBV DNA, and hepatitis B surface antibody (HBsAb) when aged 9 months, and then 24 months...
November 22, 2016: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/27879004/plant-domestication-and-the-assembly-of-bacterial-and-fungal-communities-associated-with-strains-of-the-common-sunflower-helianthus-annuus
#17
Jonathan W Leff, Ryan C Lynch, Nolan C Kane, Noah Fierer
Root and rhizosphere microbial communities can affect plant health, but it remains undetermined how plant domestication may influence these bacterial and fungal communities. We grew 33 sunflower (Helianthus annuus) strains (n = 5) that varied in their extent of domestication and assessed rhizosphere and root endosphere bacterial and fungal communities. We also assessed fungal communities in the sunflower seeds to investigate the degree to which root and rhizosphere communities were influenced by vertical transmission of the microbiome through seeds...
November 23, 2016: New Phytologist
https://www.readbyqxmd.com/read/27872736/zika-virus-a-review-from-the-virus-basics-to-proposed-management-strategies
#18
REVIEW
Lorenzo Zammarchi, Michele Spinicci, Alessandro Bartoloni
This review aims to summarize the body of knowledge available on Zika virus to date. A comprehensive review of the scientific literature on Zika virus was performed with the aim to stress relevant aspects for healthcare professionals in the non-endemic areas. For several years, the Zika virus infection was considered an extremely rare exotic disease with poor clinical relevance. However, Zika virus has recently gained the attention of the scientific community and public opinion since the virus spread to the Pacific islands and the South America in an unprecedented epidemic, and additionally due to the definitive evidence that the infection could be complicated by Guillain-Barré syndrome, passed through vertical transmission, and result in central nervous system abnormalities (including microcephaly) of the fetus...
2016: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/27870810/neonatal-group-b-streptococcus-infections-prevention-strategies-clinical-and-microbiologic-characteristics-in-7-years-of-surveillance
#19
Roberta Creti, Monica Imperi, Alberto Berardi, Marco Pataracchia, Simona Recchia, Giovanna Alfarone, Lucilla Baldassarri
BACKGROUND: The characteristics of group B streptococcus (GBS) neonatal disease in a period of 7 years are reported. METHODS: The estimation of the neonatal GBS disease risk and prevention strategies adopted at delivery in absence of national guidelines were evaluated by the analysis of 3501 questionnaires. Notification of 194 neonatal GBS infections was recorded. In addition, 115 strains from neonatal early and late onset disease (EOD and LOD, respectively) plus 320 strains from pregnant women were analyzed by molecular typing methods and for antibiotic resistance...
November 18, 2016: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27869772/aphis-glycines-virus-2-a-novel-insect-virus-with-a-unique-genome-structure
#20
Sijun Liu, Diveena Vijayendran, Yuting Chen, Bryony C Bonning
The invasive soybean aphid, Aphis glycines, is a major pest in soybeans, resulting in substantial economic loss. We analyzed the A. glycines transcriptome to identify sequences derived from viruses of A. glycines. We identified sequences derived from a novel virus named Aphis glycines virus 2 (ApGlV2). The assembled virus genome sequence was confirmed by reverse transcription polymerase chain reaction (RT-PCR) and Sanger sequencing, conserved domains were characterized, and distribution, and transmission examined...
November 19, 2016: Viruses
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