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https://www.readbyqxmd.com/read/29448702/study-on-strain-compensation-for-multiple-quantum-well-in-infrared-light-emitting-diode-using-the-in-x-ga-1-x-p-strain-barrier
#1
Dae-Kwang Kim, Hyung-Joo Lee
Strain compensation for multiple-quantum wells (MQWs) relative to the efficiency improvement of infrared light-emitting diodes (IR-LEDs) was investigated through the use of an InxGa1-xP strain barrier. The InxGa1-xP barrier, which was inserted between the n-confinement and active regions, developed for the reduction of lattice-mismatched strains in GaAs/AlGaAs and InGaAs/GaAs MQWs. Through photoluminescence, improved intensity was displayed in InGaAs/GaAs MQWs having InxGa1-xP strain barriers, with a significant increase in the intensity observed at the In0...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29416673/splice-variants-of-the-endonucleases-xpf-and-xpg-contain-residual-dna-repair-capabilities-and-could-be-a-valuable-tool-for-personalized-medicine
#2
Janin Lehmann, Steffen Schubert, Christina Seebode, Antje Apel, Andreas Ohlenbusch, Steffen Emmert
The two endonucleases XPF and XPG are essentially involved in nucleotide excision repair (NER) and interstrand crosslink (ICL) repair. Defects in these two proteins result in severe diseases like xeroderma pigmentosum (XP). We applied our newly CRISPR/Cas9 generated human XPF knockout cell line with complete loss of XPF and primary fibroblasts from an XP-G patient (XP20BE) to analyze until now uncharacterized spontaneous mRNA splice variants of these two endonucleases. Functional analyses of these variants were performed using luciferase-based reporter gene assays...
January 2, 2018: Oncotarget
https://www.readbyqxmd.com/read/29410519/rationale-and-design-of-an-inhibitor-of-reca-protein-as-an-inhibitor-of-acinetobacter-baumannii
#3
Vishvanath Tiwari, Monalisa Tiwari, Deepika Biswas
Acinetobacter baumannii is one of the ESKAPE pathogen, which causes pneumonia, urinary tract infections, and is linked to high degree of morbidity and mortality. One-way antibiotic and disinfectant resistance is acquired by the activation of RecA-mediated DNA repair (SOS-response) that maintain ROS-dependent DNA damage caused by these anti-bacterial molecules. To increase the efficacy of different anti-microbial, there is a need to design an inhibitor against RecA of A. baumannii. We have performed homology modeling to generate the structure of RecA, followed by model refinement and validation...
February 6, 2018: Journal of Antibiotics
https://www.readbyqxmd.com/read/29403087/cerebellar-ataxia-dominant-phenotype-in-patients-with-ercc4-mutations
#4
Hiroshi Doi, Shigeru Koyano, Satoko Miyatake, Shinji Nakajima, Yuka Nakazawa, Misako Kunii, Atsuko Tomita-Katsumoto, Kayoko Oda, Yukie Yamaguchi, Ryoko Fukai, Shingo Ikeda, Rumiko Kato, Katsuhisa Ogata, Shun Kubota, Noriko Hayashi, Keita Takahashi, Mikiko Tada, Kenichi Tanaka, Mitsuko Nakashima, Yoshinori Tsurusaki, Noriko Miyake, Hirotomo Saitsu, Tomoo Ogi, Michiko Aihara, Hideyuki Takeuchi, Naomichi Matsumoto, Fumiaki Tanaka
Autosomal recessive cerebellar ataxias (ARCAs) are clinically and genetically heterogeneous neurological disorders. Through whole-exome sequencing of Japanese ARCA patients, we identified three index patients from unrelated families who had biallelic mutations in ERCC4. ERCC4 mutations have been known to cause xeroderma pigmentosum complementation group F (XP-F), Cockayne syndrome, and Fanconi anemia phenotypes. All of the patients described here showed very slowly progressive cerebellar ataxia and cognitive decline with choreiform involuntary movement, with young adolescent or midlife onset...
February 5, 2018: Journal of Human Genetics
https://www.readbyqxmd.com/read/29400412/synthesis-docking-in-vitro-and-in-vivo-antidiabetic-activity-of-pyrazole-based-2-4-thiazolidinedione-derivatives-as-ppar-%C3%AE-modulators
#5
Mohd Javed Naim, Ozair Alam, Md Jahangir Alam, Mohammad Shaquiquzzaman, Md Mumtaz Alam, Vegi Ganga Modi Naidu
The design, synthesis, structure-activity relationship, and biological activity of 2,4-thiazolidinedione derivatives as peroxisome proliferator-activated receptor-γ (PPAR-γ) modulators for antidiabetic activity are reported. Fifteen 2,4-thiazolidinedione derivatives clubbed with pyrazole moiety were docked into the ligand binding domain of PPAR-γ by the Glide XP module of Schrodinger. Eight derivatives (5a, 5b, 5d, 5f, 5i, 5l, 5n, 5o) having Glide XP scores > -8 as compared to the standard drug, rosiglitazone (Glide XP score = -9...
February 5, 2018: Archiv der Pharmazie
https://www.readbyqxmd.com/read/29391431/orbital-anisotropic-electronic-structure-in-the-nonmagnetic-state-of-bafe2-as1-xp-x-2-superconductors
#6
T Sonobe, T Shimojima, A Nakamura, M Nakajima, S Uchida, K Kihou, C H Lee, A Iyo, H Eisaki, K Ohgushi, K Ishizaka
High-temperature superconductivity in iron-pnictides/chalcogenides arises in balance with several electronic and lattice instabilities. Beside the antiferromagnetic order, the orbital anisotropy between Fe 3d xz and 3d yz occurs near the orthorhombic structural transition in several parent compounds. However, the extent of the survival of orbital anisotropy against the ion-substitution remains to be established. Here we report the composition (x) and temperature (T) dependences of the orbital anisotropy in the electronic structure of a BaFe2(As1-xP x )2 system by using angle-resolved photoemission spectroscopy...
February 1, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29386773/shear-bond-strength-of-different-restorative-materials-to-mineral-trioxide-aggregate-and-biodentine
#7
Fatih Tulumbaci, Merve Erkmen Almaz, Volkan Arikan, Merve Safa Mutluay
Significance of Study: Mineral trioxide aggregate (MTA) and Biodentine (calcium silicate-based materials) have great importance in dentistry. There is no study comparing the bond strength of Biodentine and MTA for composite, compomer, and compomer or resin-modified glass ionomer (RMGIC). Although many advantages of Biodentine over MTA; in this study, MTA has shown better shear bond strength (SBS) to restorative materials. Aim: Recently, a variety of calcium silicate-based materials are often used for pulp capping, perforation repair, and endodontic therapies...
September 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29383457/adverse-drug-reactions-triggered-by-the-common-hla-b-57-01-variant-virtual-screening-of-drugbank-using-3d-molecular-docking
#8
George Van Den Driessche, Denis Fourches
BACKGROUND: Idiosyncratic adverse drug reactions have been linked to a drug's ability to bind with a human leukocyte antigen (HLA) protein. However, due to the thousands of HLA variants and limited structural data for drug-HLA complexes, predicting a specific drug-HLA combination represents a significant challenge. Recently, we investigated the binding mode of abacavir with the HLA-B*57:01 variant using molecular docking. Herein, we developed a new ensemble screening workflow involving three X-ray crystal derived docking procedures to screen the DrugBank database and identify potentially HLA-B*57:01 liable drugs...
January 30, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29377344/reversed-actinic-damage-in-two-children-with-xeroderma-pigmentosum-treated-with-topical-imiquimod
#9
I Latour, A Hernández-Martín, C Ged, N Knöpfel, A Taïeb, A Torrelo
Xeroderma pigmentosum (XP) is a group of genetic diseases with high incidence of ultraviolet-related skin cancers that usually appear in childhood. Treatment options for skin cancer in XP include surgery, electrocoagulation, topical 5-fluorouracil or imiquimod 5% cream1 . Oral retinoids have been used for skin cancer prevention, alone or in combination with topical imiquimod, with good response2 . This article is protected by copyright. All rights reserved.
January 29, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29374753/xeroderma-pigmentosum-facts-and-perspectives
#10
REVIEW
Janin Lehmann, Christina Seebode, Marie Christine Martens, Steffen Emmert
Ultraviolet (UV)-induced DNA lesions are almost exclusively removed by the nucleotide excision repair (NER) pathway, which is essential for prevention of skin cancer development. Patients with xeroderma pigmentosum (XP) are extremely sun sensitive due to a genetic defect in components of the NER cascade. They present with first signs of premature skin aging at an early age, with a considerably increased risk of developing UV-induced skin cancer. XP belongs to the group of DNA repair defective disorders that are mainly diagnosed in the clinic and in hindsight confirmed at the molecular level...
February 2018: Anticancer Research
https://www.readbyqxmd.com/read/29372626/capecitabine-cisplatin-versus-5-fluorouracil-cisplatin-in-chinese-patients-with-advanced-and-metastatic-gastric-cancer-re-analysis-of-efficacy-and-safety-data-from-the-ml17032-phase-iii-clinical-trial
#11
Jia Chen, Jianping Xiong, Jiejun Wang, Leizhen Zheng, YanFei Gao, Zhongzhen Guan
AIM: To confirm non-inferiority and test potential superiority of capecitabine/cisplatin (XP) over 5-fluorouracil (5-FU)/cisplatin (FP) as first-line treatment for advanced gastric cancer (AGC) in Chinese patients. METHODS: In open-label phase III ML17032 trial, AGC (stage IIIA-IV) patients with or without metastases were randomized 1:1 to receive cisplatin (80 mg/m2 /day intravenous [IV] day 1) with either capecitabine (1000 mg/m2 /day oral [PO] twice daily [BID], days 1-14; XP) or 5-FU (800 mg/m2 /day continuous IV days 1-5; FP) every 3 weeks...
January 26, 2018: Asia-Pacific Journal of Clinical Oncology
https://www.readbyqxmd.com/read/29359265/heterologous-expression-of-oenococcus-oeni-shsp20-confers-temperature-stress-tolerance-in-escherichia-coli
#12
Yan Li, Xiaoguang Xu, Rui Qu, Guoqiang Zhang, Muhammad Shahid Riaz Rajoka, Dongyan Shao, Chunmei Jiang, Junling Shi
Small heat shock proteins (sHSPs) are heat shock proteins sized 12-43 kDa that can protect proteins from denaturation, particularly under high temperature; sHSPs thus increase the heat tolerance capability of an organisms enabling survival in adverse climates. sHSP20 is overexpressed in Oenococcus oeni in response to low temperatures. However, we found that overexpression of sHSP20 in Escherichia coli BL21 increased the microbial survival ratio at 50 °C by almost 2 h. Adding sHSP20 to the glutamate dehydrogenase solution significantly increased the stability of the enzyme at high temperature (especially at 60-70 °C), low pH values (especially below 6...
January 22, 2018: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/29345071/detecting-selection-signatures-on-the-x-chromosome-of-the-chinese-debao-pony
#13
X-X Liu, J-F Pan, Q-J Zhao, X-H He, Y-B Pu, J-L Han, Y-H Ma, L Jiang
The X chromosome shows a special interaction between demographic factors and genetic variation, and the analysis of X-linked genomic variation can therefore provide insights into the unique effects of demography and selection on the horse genome that cannot be readily detected by autosomal markers. Debao (DB) ponies have experienced intense selective pressure for the development of their small stature (<106 cm at adult height). To identify selective sweeps on the X chromosome of the DB pony, we performed a genome-wide scan of three Chinese horse breeds using an Equine SNP70 BeadChip...
February 2018: Journal of Animal Breeding and Genetics, Zeitschrift Für Tierzüchtung und Züchtungsbiologie
https://www.readbyqxmd.com/read/29325523/fanconi-anemia-with-sun-sensitivity-caused-by-a-xeroderma-pigmentosum-associated-missense-mutation-in-xpf
#14
Isabell Popp, Maqsood Punekar, Nick Telford, Stavros Stivaros, Kate Chandler, Meenakshi Minnis, Anna Castleton, Claire Higham, Louise Hopewell, D Gareth Evans, Anja Raams, Arjan F Theil, Stefan Meyer, Detlev Schindler
BACKGROUND: Fanconi anemia (FA) is an inherited genomic instability disorder with congenital and developmental abnormalities, bone marrow failure and predisposition to cancer early in life, and cellular sensitivity to DNA interstrand crosslinks. CASE PRESENTATION: A fifty-one-year old female patient, initially diagnosed with FA in childhood on the basis of classic features and increased chromosomal breakage, and remarkable sun-sensitivity is described. She only ever had mild haematological abnormalities and no history of malignancy...
January 11, 2018: BMC Medical Genetics
https://www.readbyqxmd.com/read/29320558/thrombolysis-in-stroke-patients-comparability-of-point-of-care-versus-central-laboratory-international-normalized-ratio
#15
Ramona C Dolscheid-Pommerich, Sarah Dolscheid, Lars Eichhorn, Birgit Stoffel-Wagner, Ingo Graeff
BACKGROUND: In acute stroke patients, thrombolysis is one gold standard therapy option within the first four hours after the ischemic event. A contraindication for thrombolysis is an International Normalized Ratio (INR) value >1.7. Since time is brain, rapid and reliable INR results are fundamental. Aim was to compare INR values determined by central laboratory (CL) analyzer and Point-of-Care Testing(POCT)-device and to evaluate the quality of POCT performance in cases of potential therapeutic thrombolysis at a certified stroke unit...
2018: PloS One
https://www.readbyqxmd.com/read/29316339/reply-x-chromosome-short-arm-involvement-in-autoimmune-diseases-comment-on-the-report-by-sharma-et-al
#16
R Hal Scofield, Rohan Sharma, Valerie M Harris
Studying Klinefelter's syndrome (male 47,XXY) and triple X (female 4,7XXX), we propose that the number of X chromosomes mediates the female bias of systemic lupus erythematosus (SLE) and Sjögren's syndrome (SS). Our recent paper described SLE and SS patients with extremely rare X chromosome aneuploides in which distal Xp was triplicated, implicating genes lying on the short arm of X1 . Brooks points out that X-linked chronic granulomatosus disease (X-CGD) can also have gene duplication from Xp21.2 to Xp terminus, and some female carriers of X-CDG have a cutaneous lupus-like illness...
January 5, 2018: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/29306979/discovering-new-pi3k%C3%AE-inhibitors-with-a-strategy-of-combining-ligand-based-and-structure-based-virtual-screening
#17
Miao Yu, Qiong Gu, Jun Xu
PI3Kα is a promising drug target for cancer chemotherapy. In this paper, we report a strategy of combing ligand-based and structure-based virtual screening to identify new PI3Kα inhibitors. First, naïve Bayesian (NB) learning models and a 3D-QSAR pharmacophore model were built based upon known PI3Kα inhibitors. Then, the SPECS library was screened by the best NB model. This resulted in virtual hits, which were validated by matching the structures against the pharmacophore models. The pharmacophore matched hits were then docked into PI3Kα crystal structures to form ligand-receptor complexes, which are further validated by the Glide-XP program to result in structural validated hits...
January 6, 2018: Journal of Computer-aided Molecular Design
https://www.readbyqxmd.com/read/29305302/actual-state-of-knowledge-in-the-field-of-diseases-related-with-defective-nucleotide-excision-repair
#18
REVIEW
Barbara Bukowska, Bolesław T Karwowski
Xeroderma pigmentosum (XP), trichothiodystrophy (TTD) and Cockayne syndrome (CS) are rare genetic diseases characterized by a large range of clinical symptoms. However, they are all associated with defects in nucleotide excision repair (NER), the system responsible for removing bulky DNA lesions such as those generated by UV light: cyclobutane pyrimidine dimers (CPDs) and pyrimidine-pyrimidone photoproducts (6-4 PPs). Over the past years, detailed structural and biochemical information on NER-associated proteins has emerged...
January 2, 2018: Life Sciences
https://www.readbyqxmd.com/read/29303991/characterization-of-two-vao-type-flavoprotein-oxidases-from-myceliophthora-thermophila
#19
Alessandro R Ferrari, Henriëtte J Rozeboom, Aniek S C Vugts, Martijn J Koetsier, Robert Floor, Marco W Fraaije
The VAO flavoprotein family consists mostly of oxidoreductases harboring a covalently linked flavin cofactor. The linkage can be either monocovalent at position 8 with a histidine or tyrosine or bicovalent at position 8 with a histidine and at position 6 with a cysteine. Bicovalently bound flavoproteins show a preference for bulkier substrates such as oligosaccharides or secondary metabolites. The genome of the thermophilic fungus Myceliophthora thermophila C1 was found to be rich in genes encoding putative covalent VAO-type flavoproteins...
January 5, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29302283/smear-layer-removal-evaluation-of-different-protocol-of-bio-race-file-and-xp-endo-finisher-file-in-corporation-with-edta-17-and-naocl
#20
Vahid Zand, Hadi Mokhtari, Mohammad-Frough Reyhani, Neda Nahavandizadeh, Shahram Azimi
Background: The aim of the present study was to compare the amount of the smear layer remaining in prepared root canals with different protocols of Bio RaCe files and XP-endo Finisher file (XPF) in association with 17% EDTA and sodium hypochlorite solution. Material and Methods: A total of 68 extracted single-rooted teeth were randomly divided into 4 experimental groups (n=14) and two control groups (n=6). The root canals were prepared with Bio RaCe files (FKG Dentaire, Switzerland) using the crown-down technique based on manufacturer's instructions and irrigated according to the following irrigation techniques: Group 1: XPF with 2 mL of 2...
November 2017: Journal of Clinical and Experimental Dentistry
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