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https://www.readbyqxmd.com/read/27936490/combining-ancestral-sequence-reconstruction-with-protein-design-to-identify-an-interface-hotspot-in-a-key-metabolic-enzyme-complex
#1
Alexandra Holinski, Kristina Heyn, Rainer Merkl, Reinhard Sterner
It is important to identify hotspot residues that determine protein-protein interactions in interfaces of macromolecular complexes. We have applied a combination of ancestral sequence reconstruction and protein design to identify hotspots within imidazole glycerol phosphate synthase (ImGPS). ImGPS is a key metabolic enzyme complex, which links histidine and de novo purine biosynthesis and consists of the cyclase subunit HisF and the glutaminase subunit HisH. Initial fluorescence titration experiments showed that HisH from Zymomonas mobilis (zmHisH) binds with high affinity to the reconstructed HisF from the last universal common ancestor (LUCA-HisF) but not to HisF from Pyrobaculum arsenaticum (paHisF), which differ by 103 residues...
December 9, 2016: Proteins
https://www.readbyqxmd.com/read/27936480/treatment-of-fulminant-acute-hepatitis-b-with-nucles-t-id-analogues-is-safe-and-does-not-lead-to-secondary-chronification-of-hepatitis-b
#2
C Jochum, F Maischack, O E Anastasiou, J Verheyen, J Timm, L Bechmann, G Gerken, A Canbay
Background: Acute hepatitis B virus (HBV) infection is still a major cause of acute liver failure (ALF), necessitating a high rate of emergency liver transplantation (LTx). Acute infection is followed by high viral replication rates leading to hepatocyte death and, ultimately, ALF. The objective of treating HBV-induced ALF thus is to eliminate, or significantly suppress, HBV replication and therefore reduce cell death and support regeneration. Objective: In this retrospective study, we want to evaluate the timing, the safety, and the long-term virological outcome of this approach...
December 2016: Zeitschrift Für Gastroenterologie
https://www.readbyqxmd.com/read/27936449/methotrexate-treated-ectopic-pregnancy-beta-human-chorionic-gonadotropin-serum-changes-as-a-success-predictor-using-a-mathematical-model-validation
#3
Aleksandra Kovaleva, Natalia Irishina, Augusto Pereira, Tatiana Cuesta-Guardiola, Luis Ortiz-Quintana
BACKGROUND: Surgical rescue of methotrexate-treated ectopic pregnancy is necessary when tubal rupture or medical therapy failure is detected during post-therapeutic monitoring. It is known that an increased beta human chorionic gonadotropin (β-hCG) concentration is the most important factor associated with treatment failure. Therefore, we suggested that relative changes in serum β-hCG could predict a successful result of medical treatment, leading to facilitation of the decision to forgo the prospect of possible surgical rescue...
October 27, 2016: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/27936438/stressful-life-transitions-and-wellbeing-a-comparison-of-the-stress-buffering-hypothesis-and-the-social-identity-model-of-identity-change
#4
Nurul F Praharso, Morgan J Tear, Tegan Cruwys
The relationship between stressful life transitions and wellbeing is well established, however, the protective role of social connectedness has received mixed support. We test two theoretical models, the Stress Buffering Hypothesis and the Social Identity Model of Identity Change, to determine which best explains the relationship between social connectedness, stress, and wellbeing. Study 1 (N=165) was an experiment in which participants considered the impact of moving cities versus receiving a serious health diagnosis...
November 29, 2016: Psychiatry Research
https://www.readbyqxmd.com/read/27936414/-am-i-too-emotional-for-this-job-an-exploration-of-student-midwives-experiences-of-coping-with-traumatic-events-in-the-labour-ward
#5
Liz Coldridge, Sarah Davies
BACKGROUND: midwifery is emotionally challenging work, and learning to be a midwife brings its own particular challenges. For the student midwife, clinical placement in a hospital labour ward is especially demanding. In the context of organisational tensions and pressures the experience of supporting women through the unpredictable intensity of the labour process can be a significant source of stress for student midwives. Although increasing attention is now being paid to midwives' traumatic experiences and wellbeing few researchers have examined the traumatic experiences of student midwives...
November 28, 2016: Midwifery
https://www.readbyqxmd.com/read/27936377/broad-thinking-an-interview-with-harold-kalant
#6
Harold Kalant
In this interview, Harold Kalant, M.D., Ph.D., professor emeritus at the University of Toronto, talks about his career in addiction science; his professional associations with E. M. Jellinek, Griffith Edwards, and other luminaries; the growth of the addiction field; and the issue of cannabis legalization in Canada, among other topics.
January 2017: Journal of Studies on Alcohol and Drugs
https://www.readbyqxmd.com/read/27936373/is-4-20-an-event-specific-marijuana-holiday-a-daily-diary-investigation-of-marijuana-use-and-consequences-among-college-students
#7
Adrian J Bravo, Matthew R Pearson, Bradley T Conner, Jamie E Parnes
OBJECTIVE: Given the popular association between April 20 ("4/20") and marijuana, the present study examined marijuana use and consequences on 4/20 compared with other days in order to test whether 4/20 is a high-risk, event-specific marijuana use holiday among college student marijuana users. METHOD: Fifty-nine college student marijuana users from three different, large U.S. universities located in Virginia, New Mexico, and Colorado completed daily brief surveys (<10 minutes) over a 12-day (April 15-April 26) period assessing prior-day marijuana use (i...
January 2017: Journal of Studies on Alcohol and Drugs
https://www.readbyqxmd.com/read/27936366/the-association-between-secondhand-harms-from-alcohol-and-mental-health-outcomes-among-postsecondary-students
#8
Kara Thompson, Parnell Davis-MacNevin, Michael Teehan, Sherry Stewart
OBJECTIVE: There is a paucity of research on the prevalence and consequences of secondhand harms from alcohol. The current study (a) investigated whether secondhand harms can be clustered into latent factors that reflect distinct but related types of harms and (b) examined the associations between experiencing secondhand harms and mental health outcomes, including anxiety, depression, and subjective mental well-being, among first-year Canadian postsecondary students. The moderating effect of living arrangement (i...
January 2017: Journal of Studies on Alcohol and Drugs
https://www.readbyqxmd.com/read/27936325/effect-of-heteroatom-substitution-on-transport-in-alkane-dithiol-based-molecular-tunnel-junctions-evidence-for-universal-behavior
#9
Zuoti Xie, Ioan Baldea, Stuart Oram, Christopher E Smith, C Daniel Frisbie
The transport properties of molecular junctions based on alkane dithiols with three different methylene chain lengths were compared with junctions based on similar chains wherein every third -CH2- was replaced with O or S, i.e., following the general formula: HS(CH2CH2X)nCH2CH2SH, where X = CH2, O or S, and n = 1, 2, or 3. Conducting probe atomic force microscopy (CP-AFM) revealed that the low bias resistance of the chains increased upon substitution in the order CH2 < O < S. This change in resistance is ascribed to the observed identical trend in contact resistance, R_c, whereas the exponential prefactor β (length sensitivity) was essentially the same for all chains...
December 9, 2016: ACS Nano
https://www.readbyqxmd.com/read/27936263/-highlighting-the-lived-experience-of-families-family-peer-support-services-initiative
#10
Catherine Briand, Rose-Anne St-Paul, Francine Dubé
To support personal recovery, any person with a mental illness should have access to a range of practices recommended by scientific evidence. The peer support are some of the services recommended by the Mental Health Commission of Canada for the reduction of the economic and social burden of mental illness. If peer support from families is poorly documented, peer support and mutual aid from users have been the subject of several studies. Based on two studies in which she participated, addressing the needs of families, and its experience as a non-profit support organization for families, the Quebec Society of Schizophrenia (QSS) has reflected on the family support problem upon entry in the health system as well as the involvement of families as peer support...
2016: Santé Mentale Au Québec
https://www.readbyqxmd.com/read/27936213/radiologic-histopathologic-correlation-of-cerebral-microbleeds-using-pre-mortem-and-post-mortem-mri
#11
Sven Haller, Marie-Louise Montandon, François Lazeyras, Max Scheffler, Stephan Meckel, Francois R Herrmann, Panteleimon Giannakopoulos, Enikö Kövari
INTRODUCTION: Cerebral microbleeds (CMB), also known as cerebral microhemorrhages, are small areas of susceptibility on brain magnetic resonance imaging (MRI), that are increasingly detected due to the higher availability of high-field MRI systems and dedicated pulse sequences. The prevalence of CMBs increases in cases with cognitive decline. The current investigation assessed the poorly investigated radiologic-histopathologic correlation of CMBs on MRI. METHODS: The local ethical committee approved the current investigation...
2016: PloS One
https://www.readbyqxmd.com/read/27936189/impact-of-attending-physicians-comments-on-residents-workloads-in-the-emergency-department-results-from-two-j-o-pan-randomized-controlled-trials
#12
Akira Kuriyama, Noriyuki Umakoshi, Jun Fujinaga, Toshie Kaihara, Seigo Urushidani, Naoki Kuninaga, Motohiro Ichikawa, Shinichiro Ienaga, Akira Sasaki, Tetsunori Ikegami
OBJECTIVE: To examine whether peppy comments from attending physicians increased the workload of residents working in the emergency department (ED). METHODS: We conducted two parallel-group, assessor-blinded, randomized trials at the ED in a tertiary care hospital in western Japan. Twenty-five residents who examined either ambulatory (J(^o^)PAN-1 Trial) or transferred patients (J(^o^)PAN-2 Trial) in the ED on weekdays. Participants were randomly assigned to groups that either received a peppy message such as "Hope you have a quiet day!" (intervention group) or did not (control group) from the attending physicians...
2016: PloS One
https://www.readbyqxmd.com/read/27936103/washback-effect-of-university-entrance-exams-in-applied-mathematics-to-social-sciences
#13
Luis J Rodríguez-Muñiz, Patricia Díaz, Verónica Mier, Pedro Alonso
Curricular issues of subject Applied Mathematics to Social Sciences are studied in relation to university entrance exams performed in several Spanish regions between 2009-2014. By using quantitative and qualitative analyses, it has been studied how these exams align with curriculum and how they produce a washback on curriculum and teachers' work. Additionally, one questionnaire about teachers' practices has been performed, in order to find out how the exams are influencing teaching methodology development. Main results obtained show that evaluation is producing a bias on the official curriculum, substantially simplifying the specific orientation that should guide applied mathematics...
2016: PloS One
https://www.readbyqxmd.com/read/27936016/a-tool-for-investigating-asthma-and-copd-exacerbations-a-newly-manufactured-and-well-characterised-gmp-wild-type-human-rhinovirus-for-use-in-the-human-viral-challenge-model
#14
Daniel J Fullen, Bryan Murray, Julie Mori, Andrew Catchpole, Daryl W Borley, Edward J Murray, Ganesh Balaratnam, Anthony Gilbert, Alex Mann, Fiona Hughes, Rob Lambkin-Williams
BACKGROUND: Human Rhinovirus infection is an important precursor to asthma and chronic obstructive pulmonary disease exacerbations and the Human Viral Challenge model may provide a powerful tool in studying these and other chronic respiratory diseases. In this study we have reported the production and human characterisation of a new Wild-Type HRV-16 challenge virus produced specifically for this purpose. METHODS AND STOCK DEVELOPMENT: A HRV-16 isolate from an 18 year old experimentally infected healthy female volunteer (University of Virginia Children's Hospital, USA) was obtained with appropriate medical history and consent...
2016: PloS One
https://www.readbyqxmd.com/read/27936008/cultivar-based-introgression-mapping-reveals-wild-species-derived-pm-0-the-major-powdery-mildew-resistance-locus-in-squash
#15
William L Holdsworth, Kyle E LaPlant, Duane C Bell, Molly M Jahn, Michael Mazourek
Powdery mildew is a major fungal disease on squash and pumpkin (Cucurbita spp.) in the US and throughout the world. Genetic resistance to the disease is not known to occur naturally within Cucurbita pepo and only infrequently in Cucurbita moschata, but has been achieved in both species through the introgression of a major resistance gene from the wild species Cucurbita okeechobeensis subsp. martinezii. At present, this gene, Pm-0, is used extensively in breeding, and is found in nearly all powdery mildew-resistant C...
2016: PloS One
https://www.readbyqxmd.com/read/27935989/brcaness-and-prognosis-in-triple-negative-breast-cancer-patients-treated-with-neoadjuvant-chemotherapy
#16
Hirokazu Tanino, Yoshimasa Kosaka, Hiroshi Nishimiya, Youko Tanaka, Naoko Minatani, Mariko Kikuchi, Akiko Shida, Mina Waraya, Hiroshi Katoh, Takumo Enomoto, Norihiko Sengoku, Sabine Kajita, Robert M Hoffman, Masahiko Watanabe
BRCAness is defined as the set of traits in which BRCA1 dysfunction, arising from gene mutation, methylation or deletion, results in DNA repair deficiency. In the present study, we addressed BRCAness, therapeutic efficacy, recurrence, and survival in patients with triple negative breast cancer (TNBC) who were treated with neoadjuvant chemotherapy at Kitasato University Hospital, Japan, between April 2006 and October 2012. BRCAness was determined by preoperative core needle biopsy (CNB) specimens and surgical specimens...
2016: PloS One
https://www.readbyqxmd.com/read/27935955/online-3d-ear-recognition-by-combining-global-and-local-features
#17
Yahui Liu, Bob Zhang, Guangming Lu, David Zhang
The three-dimensional shape of the ear has been proven to be a stable candidate for biometric authentication because of its desirable properties such as universality, uniqueness, and permanence. In this paper, a special laser scanner designed for online three-dimensional ear acquisition was described. Based on the dataset collected by our scanner, two novel feature classes were defined from a three-dimensional ear image: the global feature class (empty centers and angles) and local feature class (points, lines, and areas)...
2016: PloS One
https://www.readbyqxmd.com/read/27935916/self-prescription-of-paracetamol-by-undergraduate-students-in-bp-koirala-institution-of-health-sciences
#18
A K Yadav, B K Rai, S S Budhathoki, A Ghimire, S R Shrestha, G B Malla
INTRODUCTION: Self-prescription of medicines are common especially in low income countries.Paracetamol is a common medicine that is self-prescribed also among university students. Incorrect use of paracetamol can lead to ill effects on health including liver failure. There is scarce evidence of the use of paracetamol by self-medication in Nepal. The objective of this study is to evaluate the paracetamol use by self-prescription among the undergraduate students of BPKIHS. METHODS: A cross-sectional study was conducted among 570 undergraduate students of BPKIHS from February 2016 till July 2016...
July 2016: JNMA; Journal of the Nepal Medical Association
https://www.readbyqxmd.com/read/27935840/a-stress-induced-bias-in-the-reading-of-the-genetic-code-in-escherichia-coli
#19
Adi Oron-Gottesman, Martina Sauert, Isabella Moll, Hanna Engelberg-Kulka
: Escherichia coli mazEF is an extensively studied stress-induced toxin-antitoxin (TA) system. The toxin MazF is an endoribonuclease that cleaves RNAs at ACA sites. Thereby, under stress, the induced MazF generates a stress-induced translation machinery (STM), composed of MazF-processed mRNAs and selective ribosomes that specifically translate the processed mRNAs. Here, we further characterized the STM system, finding that MazF cleaves only ACA sites located in the open reading frames of processed mRNAs, while out-of-frame ACAs are resistant...
November 15, 2016: MBio
https://www.readbyqxmd.com/read/27935800/improving-access-to-child-health-services-at-the-community-level-in-zambia-a-country-case-study-on-progress-in-child-survival-2000-2013
#20
Aaron M Kipp, Margaret Maimbolwa, Marie A Brault, Penelope Kalesha-Masumbu, Mary Katepa-Bwalya, Phanuel Habimana, Sten H Vermund, Kasonde Mwinga, Connie A Haley
Reductions in under-five mortality in Africa have not been sufficient to meet the Millennium Development Goal #4 (MDG#4) of reducing under-five mortality by two-thirds by 2015. Nevertheless, 12 African countries have met MDG#4. We undertook a four country study to examine barriers and facilitators of child survival prior to 2015, seeking to better understand variability in success across countries. The current analysis presents indicator, national document, and qualitative data from key informants and community women describing the factors that have enabled Zambia to successfully reduce under-five mortality over the last 15 years and achieve MDG#4...
October 19, 2016: Health Policy and Planning
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