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https://www.readbyqxmd.com/read/28231529/new-enantioselective-lc-method-development-and-validation-for-the-assay-of-modafinil
#1
Marianna Harvanová, Taťána Gondová
For the first time, a new, fast and sensitive chromatographic method for the separation and determination of modafinil enantiomers was developed on chiral stationary phase with macrocyclic glycopeptide teicoplanin in the polar organic mode. The effect of the mobile phase composition and column temperature on the retention and enantioseparation were studied. The separation was performed using a Chirobiotic T column (250×4.6mm, 5μm) with methanol and triethylamine (100/0.05, v/v) as the mobile phase at a flow rate of 1...
February 16, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28231014/cyclombandakamines-a1-and-a2-oxygen-bridged-naphthylisoquinoline-dimers-from-a-congolese-ancistrocladus-liana
#2
Blaise Kimbadi Lombe, Torsten Bruhn, Doris Feineis, Virima Mudogo, Reto Brun, Gerhard Bringmann
Cyclombandakamines A1 (1) and A2 (2), both with an unprecedented pyrane-cyclohexenone-dihydrofuran sequence and six stereocenters and two chiral axes, are the first oxygen-bridged dimeric naphthylisoquinoline alkaloids. They were isolated from the leaves of an as yet unidentified Congolese Ancistrocladus species. Their stereostructures were established by spectroscopic, chemical, and chiroptical methods in combination with DFT and TDDFT calculations. They apparently originate from a cascade of oxidative cyclization reactions of "open-chain" naphthylisoquinoline dimers and exhibit significant antiprotozoal activities...
February 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28230915/a-singlet-oxygen-generating-agent-by-chirality-dependent-plasmonic-shell-satellite-nanoassembly
#3
Fengli Gao, Maozhong Sun, Wei Ma, Xiaoling Wu, Liqiang Liu, Hua Kuang, Chuanlai Xu
Photodynamic therapy (PDT) agent, which generates singlet oxygen ((1) O2 ) under light, has attracted significant attention for its broad biological and medical applications. Here, DNA-driven shell-satellite (SS) gold assemblies as chiral photosensitizers are first fabricated. The chiral plasmonic nanostructure, coupling with cysteine enantiomers on its surface, exhibits intense chiroplasmonic activities (-40.2 ± 2.6 mdeg) in the visible region. These chiral SS nanoassemblies have high reactive oxygen species generating efficiency under circular polarized light illumination, resulting in a (1) O2 quantum yield of 1...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28230787/bat-astroviruses-towards-understanding-the-transmission-dynamics-of-a-neglected-virus-family
#4
REVIEW
Kerstin Fischer, Vinícius Pinho Dos Reis, Anne Balkema-Buschmann
Bats belong to the order Chiroptera that represents the second largest order of mammals with more than 1200 species and an almost global distribution. Environmental changes and deforestation have severely influenced many ecosystems, intensifying the contact between wildlife and humans. In recent years, bats have been found to harbor a number of different viruses with zoonotic potential, as well as a great diversity of astroviruses, for which the question of zoonotic potential remains unanswered to date. Human astroviruses have been identified as the causative agent for diarrhea in children and immunocompromised patients...
February 21, 2017: Viruses
https://www.readbyqxmd.com/read/28228701/chiropractic-management-of-a-patient-with-thoracic-pain-and-a-stable-thoracic-aortic-aneurysm-a-case-report
#5
Shawn M Neff, Casey S Okamoto
OBJECTIVE: The purpose of this case report was to describe chiropractic management of thoracic pain in a patient with a stable thoracic aortic aneurysm. CLINICAL FEATURES: An 89-year-old man presented with axial mid- and upper back pain localized predominantly at the T8 and T1 spinal segmental levels. A review of available imaging revealed a stable aneurysmal dilatation of the ascending aorta, which measured 4.3 cm. INTERVENTION AND OUTCOME: Because the thoracic pain was musculoskeletal in nature and the thoracic aortic aneurysm was stable, mechanical manipulation was provided using the Impulse adjusting instrument...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28228700/osteochondroma-and-spinal-cord-compression-in-a-patient-with-hereditary-multiple-exostoses-a-case-report
#6
Robert J Zoboski
OBJECTIVE: The purpose of this report was to describe the presentation of a patient with hereditary multiple exostoses and thoracic spinal cord compression from an osteochondroma. CLINICAL FEATURES: A 31-year-old female presented to a chiropractic clinic with a history of hereditary multiple exostoses and back pain that had existed since the age of 16 years. She had a past medical history that was remarkable for 3 prior surgeries for mass removal. Examination revealed a left upper midscapular mass with decreased sensation...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28228699/chiropractic-treatments-for-idiopathic-scoliosis-a-narrative-review-based-on-sosort-outcome-criteria
#7
REVIEW
Mark W Morningstar, Clayton J Stitzel, Aatif Siddiqui, Brian Dovorany
OBJECTIVE: The purpose of this review was to evaluate the current body of literature on chiropractic treatment of idiopathic scoliosis against the 2014 consensus paper of the Society on Scoliosis Orthopedic and Rehabilitation Treatment (SOSORT) and the Scoliosis Research Society (SRS) Non-Operative Management Committee for outcome reporting in nonoperative treatments. METHODS: A search of the PubMed and Index to Chiropractic Literature databases for studies published from January 2000 through February 2016 detailing specific treatments and outcomes for idiopathic scoliosis was conducted...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28228698/current-and-prospective-use-of-musculoskeletal-diagnostic-ultrasound-imaging-at-chiropractic-teaching-institutions-a-worldwide-survey-of-diagnostic-imaging-staff
#8
Rogan E A Henderson, Bruce F Walker, Kenneth J Young
OBJECTIVE: The purpose of this study was to survey the use of musculoskeletal diagnostic ultrasound imaging (MSK-DUSI) at chiropractic educational programs worldwide and to elicit opinions of academic diagnostic imaging staff of its prospective use at their teaching institutions. METHODS: An electronic questionnaire was delivered in 2014 using SurveyMonkey and notifications were disseminated by e-mail to 127 diagnostic imaging staff at chiropractic programs worldwide...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28228696/combining-spinal-manipulation-with-standard-counseling-for-tobacco-cessation-results-of-a-feasibility-randomized-clinical-trial
#9
Kevin A Rose, Anupama Kizhakkeveettil, Gena E Kadar, Mark Losack
OBJECTIVE: The purpose of this study was to test the feasibility of a randomized clinical trial on the effectiveness of combining spinal manipulation (SM) with standard tobacco cessation counseling. METHODS: A randomized clinical trial was conducted. Participants in the intervention group received 2 months of counseling plus SM delivered by doctors of chiropractic, whereas control group participants received counseling alone. Primary outcome measures were smoking decreases and 7-day smoking abstinence as measured by a tobacco diary and urinary cotinine...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28228694/survey-of-primary-contact-medical-and-chiropractic-clinicians-on-self-reported-knowledge-and-recognition-of-mild-traumatic-brain-injuries-a-pilot-study
#10
David N Taylor, Frank J Ponce, Stephen J Dyess
OBJECTIVE: The purpose of this study was to assess the self-reported knowledge of concussion recognition and treatment with first-contact family medical and chiropractic practitioners by means of a pilot study of the need, construct validity, and feasibility for further investigation of mild traumatic brain injury (MTBI) knowledge base. METHODS: Two hundred forty-eight practicing chiropractic and 120 medical physicians in the south and northeastern sections of the United States were contacted by e-mail, telephone, and postal mail to answer an 18-item survey on knowledge, diagnosis, and common practice with respect to traumatic brain injury patients...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28222912/induced-circularly-polarized-luminescence-for-revealing-dna-binding-with-fluorescent-dyes
#11
Marcin Górecki, Francesco Zinna, Tarita Biver, Lorenzo Di Bari
To the best of our knowledge this is the first report on the application of induced circularly polarized luminescence (CPL) for sensing the binding of fluorescent dyes to double stranded DNA. Using Thiazole Orange (TO) and 4',6-diamidino-2-phenylindole (DAPI) as models, we show utility and limitations of CPL in DNA binding studies. The results obtained indicate that CPL can be used as a new chiroptical tool for this purpose, however, special attention while recording CPL data must be used, in order to exclude measurement artefacts caused by linear polarization components...
February 12, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28218431/spiral-patterning-of-au-nanoparticles-on-au-nanorod-surface-to-form-chiral-aunr-aunp-helical-superstructures-templated-by-dna-origami
#12
Chenqi Shen, Xiang Lan, Chenggan Zhu, Wei Zhang, Leyu Wang, Qiangbin Wang
Plasmonic motifs with precise surface recognition sites are crucial for assembling defined nanostructures with novel functionalities and properties. In this work, a unique and effective strategy is successfully developed to pattern DNA recognition sites in a helical arrangement around a gold nanorod (AuNR), and a new set of heterogeneous AuNR@AuNP plasmonic helices is fabricated by attaching complementary-DNA-modified gold nanoparticles (AuNPs) to the predesigned sites on the AuNR surface. AuNR is first assembled to one side of a bifacial rectangular DNA origami, where eight groups of capture strands are selectively patterned on the other side...
February 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28203653/isolation-of-a-chiral-anthracene-cation-radical-x-ray-crystallography-and-computational-interrogation-of-its-racemization
#13
Maxim V Ivanov, Khushabu Thakur, Anshul Bhatnagar, Rajendra Rathore
Chiral cation-radical salts hold significant promise as charge-transfer materials, chiroptical switches, and electron-transfer catalysts for enantioselective synthesis. Herein we demonstrate that the readily-available chiral 9,10-diphenyleanthracene derivative (i.e.(S)ANT) forms a robust cation radical, whose structure was elucidated by X-ray crystallography and DFT calculations. While (S)ANT was observed to racemize on a timescale (t1/2) of 1.1 hours, a computational conformational search and kinetic analysis of the racemization pathway led us to identify a simple methyl substituted (S)ANT derivative, which does not racemize (racemization t1/2 10(13)-10(17) years)...
February 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28202094/impact-of-routine-bacillus-thuringiensis-israelensis-bti-treatment-on-the-availability-of-flying-insects-as-prey-for-aerial-feeding-predators
#14
Ute Timmermann, Norbert Becker
Since 1980, mosquito breeding habitats in the Upper Rhine Valley were routinely treated with Bacillus thuringiensis var. israelensis (Bti). Bti is considered to significantly reduce the number of mosquitoes, and - especially when used in higher dosages - to be toxic to other Nematocera species, e.g. Chironomidae, which could be food sources for aerial feeding predators. To investigate direct and indirect effects of routine Bti treatment on food sources for aerial feeding predators, the availability of flying insects in treated and untreated areas was compared...
February 16, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28199040/isotopic-half-life-and-enrichment-factor-in-two-species-of-european-freshwater-fish-larvae-an-experimental-approach
#15
Adrien Latli, Nicolas Sturaro, Nelson Desjardin, Loïc N Michel, William Otjacques, Gilles Lepoint, Patrick Kestemont
RATIONALE: Stable isotope ratios of carbon and nitrogen are valuable tools for field ecologists to use to analyse animal diets. However, the application of these tools requires knowledge of the tissue enrichment factor (TEF) and half-life (HL). We experimentally compared TEF and HL in 2 freshwater fish larvae. We hypothesised that chub had a better growth/tissue replacement ratio than roach, due to the use of a food closer to their natural diet. METHODS: We determined the isotopic HL, the TEF and the contribution of growth or metabolic tissue replacement to dynamic isotopic incorporation...
February 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28196631/effects-of-12-weeks-of-chiropractic-care-on-central-integration-of-dual-somatosensory-input-in-chronic-pain-patients-a-preliminary-study
#16
Heidi Haavik, Imran Khan Niazi, Kelly Holt, Bernadette Murphy
OBJECTIVE: The purpose of this preliminary study was to assess whether the dual somatosensory evoked potential (SEP) technique is sensitive enough to measure changes in cortical intrinsic inhibitory interactions in patients with chronic neck or upper extremity pain and, if so, whether changes are associated with changes in pain scores. METHODS: The dual peripheral nerve stimulation SEP ratio technique was used for 6 subjects with a history of chronic neck or upper limb pain...
February 10, 2017: Journal of Manipulative and Physiological Therapeutics
https://www.readbyqxmd.com/read/28195671/trachycladines-and-analogues-synthesis-and-anti-cancer-activity-evaluation
#17
Zisis V Peitsinis, Achilleas G Mitrakas, Eirini A Nakiou, Dafni A Melidou, Dimitra Kalamida, Christos Kakouratos, Michael I Koukourakis, Alexandros E Koumbis
The synthesis of four new analogues of marine nucleoside trachycladine A was accomplished via direct regio- and stereoselective Vorbrüggen glycosylations of 2,6-dichloropurine and 2-chloropurine with a D-ribose derived chiron. Naturally occurring trachycladines (A and B) and a series of analogues were examined for their cytotoxic activity against a number of cancer cell lines (glioblastoma, lung and cervical cancer). Parent trachycladine A and two analogues (the diacetate of 2,6-dichloropurine derivative and N-cyclopropyl trachycladine A) were found to result in a significant reduction of cell viability, with the latter exhibiting a stronger effect...
February 14, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28194911/reversible-stereoselective-folding-unfolding-fueled-by-the-interplay-of-photoisomerism-and-hydrogen-bonding
#18
Christopher R Opie, Naoya Kumagai, Masakatsu Shibasaki
A linear molecular architecture equipped with complementary three-fold hydrogen-bonding units embedded with a photoswitchable trans-tetrafluoroazobenzene moiety was synthesized. The transto cis photoisomerism of the azobenzene unit induced drastic changes in the molecular architecture as a result of intramolecular hydrogen bonding as evidenced by NMR spectroscopy and size exclusion chromatography. A minute stereogenic element in the linear trans state enabled stereoselective folding into the cis state, thus producing a globular architecture with enhanced chiroptical property...
February 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28191306/chiropractic-management-of-post-spinal-cord-stimulator-spine-pain-a-case-report
#19
Rachel M Perrucci, Christopher M Coulis
BACKGROUND: A brief overview of failed back surgery syndrome, with emphasis on low back pain status post spinal cord stimulation, and post-surgical spinal manipulation is presented. CASE PRESENTATION: Four cases of patients within the VA Connecticut Health Care System presenting between July 2014 and July 2015 reporting low back pain after surgical insertion of spinal cord stimulators are discussed. This study describes the outcomes experienced by four patients with low back pain status post implanted spinal cord stimulators receiving manual therapy in the form of lumbar spine manipulation or mobilization...
2017: Chiropractic & Manual Therapies
https://www.readbyqxmd.com/read/28191305/the-relationship-between-chiropractor-required-and-current-level-of-business-knowledge
#20
Michael Anthony Ciolfi, Patsy Anne Kasen
BACKGROUND: Chiropractors frequently practice within health care systems requiring the business acumen of an entrepreneur. However, some chiropractors do not know the relationship between the level of business knowledge required for practice success and their current level of business knowledge. The purpose of this quantitative study was to examine the relationship between chiropractors' perceived level of business knowledge required and their perceived level of current business knowledge...
2017: Chiropractic & Manual Therapies
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