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Joanna Szymkowiak, Marcin Kwit
Readily available chiral trianglimine and their (poly)oxygenated congeners represent a unique class of macrocyclic rigid compounds optimal for testing electronic and vibrational circular dichroism exciton chirality methods. Electronic and vibrational circular dichroism spectra of such trianglimines are strongly affected by polar substituents in macrocycle skeletons. Double substitution by OH groups in each aromatic fragment of the macrocycle causes sign reversal of the exciton couplet in the region of the strongest UV absorption...
November 7, 2017: Chirality
Marcin Górecki, Maria Annunziata M Capozzi, Gianluigi Albano, Cosimo Cardellicchio, Lorenzo Di Bari, Gennaro Pescitelli
Three β-keto sulfoxides (1-3) were synthesized in enantiopure form and investigated by means of circular dichroism (CD) spectroscopy, both in electronic and vibrational range (ECD, VCD), in combination with quantum chemical calculations. For compound 2, the X-ray structure was available; thus, the ECD in the solid state was also considered to reveal the differences between the molecular species in both states. Despite the simplicity of all β-keto sulfoxides under investigation (29 atoms), reproducing even the major spectral VCD features failed for two compounds, making the use of VCD not ideal to assign their absolute configuration in a reliable way...
November 4, 2017: Chirality
Wassim Shatila, Zvonimir Krajcer
Vascular closure devices (VCD) appear to be safe when compared to manual compression or surgical closure. VCDs' main advantage seems to stem from lower time to hemostasis (TTH) and time to mobilization. In anticoagulated patients with 6-Fr femoral sheaths, the new Celt ACT VCD, which uses a stainless-steel permanent implant, seems to be safe and decreases TTH when compared to manual pressure.
November 1, 2017: Catheterization and Cardiovascular Interventions
Yacine Ben Safta, Montassar Ghalleb, Aymen Baccari, Ghassen Hamdi El Kebir, Sami Daldoul, Sofiene Sayari, Mounir Ben Moussa
INTRODUCTION: Vaginal cuff dehiscence (VCD) and evisceration (VCDE) are rare but rather serious complications of hysterectomy procedures. We aimed to report a case of VCDE happening eleven years after the initial surgery and review a treatment protocol of this rare complication. CASE: A 68 years old Tunisian female patient In 2004, the patient underwent concomitant chemoradiation followed by total abdominal radical hysterectomy for a squamous cell carcinoma of the cervix...
October 28, 2017: International Journal of Surgery Case Reports
Simone Ghidinelli, Giovanna Longhi, Giuseppe Mazzeo, Sergio Abbate, Stefan E Boiadjiev, David A Lightner
Vibrational and electronic circular dichroism (VCD and ECD) spectra of 3 optically active bilirubin analogs with propionic acid groups replaced by (1) 1-(S)-methylpropyl groups, (2) 3-acetoxy-1-(S)-methylpropyl groups, and (3) 1-(S)-2-(R)-dimethyl-2-(methoxycarbonyl)ethyl groups have been recorded at different concentrations in chloroform. The aliphatic chains attached to C-8 and C-12 of the 3 chosen mesobilirubins were modified so as to possess no OH group. The variation of the VCD spectra with concentration is consistent with the formation of dimers at high concentration...
October 30, 2017: Chirality
Hisako Sato, Tomoko Yajima, Akihiko Yamagishi
A mixture of chiral low-molecular weight gelators, (1R,2R)- or (1S,2S)-N,N'-diperfluoroheptanoyl-1,2-diaminocyclohexane (denoted as RR- or SS-CF7, respectively) and (1R,2R)- or (1S,2S)-N,N'-diheptanoyl-1,2-diaminocyclohexane (denoted as RR- or SS-CH7, respectively), was used as a two-component gelator in acetonitrile solvent. The process of gelation was investigated by time-step vibrational circular dichroism (VCD) spectroscopy. The method enabled us to study the dynamical behavior of CF7 and CH7 molecules independent of their characteristic vibrational bands...
October 27, 2017: Physical Chemistry Chemical Physics: PCCP
Andrew Fretzayas, Maria Moustaki, Ioanna Loukou, Konstantinos Douros
Vocal cord dysfunction (VCD)-associated symptoms are not rare in pediatric patients. Dyspnea, wheezing, stridor, chest pain or tightness and throat discomfort are the most commonly encountered symptoms. They may occur either at rest or more commonly during exercise in patients with VCD, as well as in asthmatic subjects. The phase of respiration (inspiration rather than expiration), the location of the wheezing origin, the rapid resolution of symptoms, and the timing occurring in relation to exercise, when VCD is exercise induced, raise the suspicion of VCD in patients who may have been characterized as merely asthmatics and, most importantly, had not responded to the appropriate treatment...
2017: Journal of Asthma and Allergy
Gaetano Angelici, Marcin Górecki, Gennaro Pescitelli, Nicola Zanna, Magda Monari, Claudia Tomasini
Ferrocene with its aromaticity and facile redox properties is an attractive moiety to be incorporated into functional moieties. Medicinal applications of ferrocene are well known and ferrocene itself shows cytotoxic and antianemic properties. In this article, we will describe the synthesis and the structure analysis of two pseudopeptides containing a ferrocene moiety as N-terminal group. After purification, Fc-l-Phe-d-Oxd-OBn [l-Phel-phenylalanine; d-Oxd(4R,5S)-4-Methyl-5-carboxy-oxazolidin-2-one] appears as bright brown solid that spontaneously forms brown needles...
October 23, 2017: Biopolymers
Guglielmo Monaco, Francesco Aquino, Riccardo Zanasi, Wouter Herrebout, Patrick Bultinck, Antonio Massa
Vibrational absorption and vibrational circular dichroism spectra (VA and VCD) have been recorded for two hybrid isoindolinone-phtalide stereoisomers dissolved in CDCl3. Density-functional calculations have been performed to determine their absolute configuration. A comparison of calculated and measured values has been made using several goodness-of-fit indicators, and also introducing a model-averaging technique, taking into account the variation of calculated spectra with the details of the computational method...
October 25, 2017: Physical Chemistry Chemical Physics: PCCP
Dmitry Kurouski
Vibrational Circular Dichroism (VCD) is a unique and relatively new spectroscopic technique that is capable of determining an absolute configuration of chiral molecules. VCD can be also used to determine structure of large macromolecules. This review highlights the most recent advances of VCD in bioanalytical chemistry. It shows that VCD is capable of unraveling supramolecular organization of peptides, proteins, saccharides, glycerophospholipids, polypeptide microcrystals, as well as amyloid fibrils and DNA...
October 16, 2017: Analytica Chimica Acta
Domitila A Huber, Darlan Bazilio, Flaviano Lorenzon, Sibele Sehnem, Lucas Pacheco, Janete A Anselmo-Franci, Fernanda B Lima
After menopause, hypertension elevates the risk of cardiac diseases, one of the major causes of women's morbidity. The gradual depletion of ovarian follicles in rats, induced by 4-vinylcyclohexene diepoxide (VCD), is a model for studying the physiology of menopause. 4-Vinylcyclohexene diepoxide treatment leads to early ovarian failure (OF) and a hormonal profile comparable to menopause in humans. We have hypothesized that OF can compromise the balance between sympathetic and parasympathetic tones of the cardiovascular system, shifting toward dominance of the former...
January 1, 2017: Reproductive Sciences
Emily Benham, Koen Deloose, Joren Callaert, Marc Bosiers, Tiffany Cox, Amy Lincourt, B Todd Heniford
INTRODUCTION: Vascular closure devices (VCDs) are designed to achieve rapid hemostasis during percutaneous coronary and peripheral vascular procedures. Studies demonstrate that VCDs improve time to hemostasis (TTH) and time to ambulation (TTA) in comparison to standard manual compression. The available products, however, typically have 13-17 steps in their application, often require hemostatic collagen or other agents as part of the process, and can result in significant scarring at the puncture site that can impact future access...
October 12, 2017: Surgical Technology International
John Kong, Leo A Joyce, Jinchu Liu, Tiffany M Jarrell, J Chris Culberson, Edward C Sherer
The absolute configurations of the separated enantiomers of fluralaner, a racemic animal health product used to prevent fleas and ticks, have been assigned using vibrational circular dichroism (VCD). The crystallographic structure of the active enantiomer (+)-fluralaner has previously been shown to have the (S) configuration using small molecule crystallography. We sought a faster analytical method to determine the absolute configuration of the separated enantiomers. When comparing the measured IR (infrared) and VCD spectra, it is apparent that the amide carbonyl groups appear in the IR but are nearly absent in the VCD...
October 5, 2017: Chirality
Gianni Dall'Ara, Andrea Santarelli, Antonio Marzocchi, Maria Letizia Bacchi Reggiani, Maria Rita Sabattini, Carolina Moretti, Cinzia Marrozzini, Nevio Taglieri, Federica Baldazzi, Nicoletta Franco, Paolo Ortolani, Matteo Chiarabelli, Giulio Rodinò, Giancarlo Piovaccari, Claudio Rapezzi, Francesco Saia
OBJECTIVES: To define the incidence of vascular complications (VC) after balloon aortic valvuloplasty (BAV) in recent years, and to compare the performance of two vascular closure devices (VCD). BACKGROUND: VC remain the most frequent drawback of BAV and are associated with adverse clinical outcomes. METHODS: All BAV procedures performed at 2 high-volume centers over a 6-year period (n = 930) were collected in prospective registries and investigated to assess the incidence of Valve Academic Research Consortium-2 (VARC-2) defined VC...
October 5, 2017: Catheterization and Cardiovascular Interventions
Hideo Yagi
In Japan, the latest trends in induction therapy for patients newly diagnosed with multiple myeloma are multi-drug combinations, including bortezomib, lenalidomide, and thalidomide. Patients <65 years old and those <70 years old who have normal cardiac and lung functions without any serious complications are good candidates for high-dose L-PAM with autologous stem cell transplantation. For successful stem cell collection, anti-cancer drugs that have a negative impact on stem cell mobilization are usually excluded from induction therapies...
2017: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
Timothy A Keiderling
Isotope labeling has a long history in chemistry as a tool for probing structure, offering enhanced sensitivity, or enabling site selection with a wide range of spectroscopic tools. Chirality sensitive methods such as electronic circular dichroism are global structural tools and have intrinsically low resolution. Consequently, they are generally insensitive to modifications to enhance site selectivity. The use of isotope labeling to modify vibrational spectra with unique resolvable frequency shifts can provide useful site-specific sensitivity, and these methods have been recently more widely expanded in biopolymer studies...
October 4, 2017: Chirality
Fei Cao, Chang-Lun Shao, Yun-Feng Liu, Hua-Jie Zhu, Chang-Yun Wang
Vibrational circular dichroism (VCD) method has become robust and reliable alternative for the stereochemical characterization of natural products. In this paper, three new serrulatane-type diterpenoids, euplexaurenes A-C (1-3), and a known metabolite, anthogorgiene P (4), were obtained from the South China Sea gorgonian Euplexaura sp. GXWZ-05. The absolute configuration of C-11 in 1-4, which was difficult to be determined by common means due to the high conformational flexibility of the eight-carbon aliphatic chain attached at C-4, was determined by VCD method, suggesting a new horizon to define the absolute configurations of natural products possessing chains...
October 2, 2017: Scientific Reports
Hermann Einsele, Monika Engelhardt, Christoph Tapprich, Jürgen Müller, Peter Liebisch, Christian Langer, Martin Kropff, Lars O Mügge, Wolfram Jung, Hans-Heinrich Wolf, Bernd Metzner, Christina Hart, Martin Gramatzki, Bernd Hertenstein, Michael Pfreundschuh, Wolf Rösler, Thomas Fischer, Georg Maschmeyer, Lothar Kanz, Georg Hess, Elke Jäger, Martin Bentz, Heinz A Dürk, Hans Salwender, Holger Hebart, Christian Straka, Stefan Knop
We assessed the safety and efficacy of bortezomib, cyclophosphamide and dexamethasone (VCD) induction therapy in previously untreated multiple myeloma patients. A total of 414 patients received three 21-day cycles of VCD prior to autologous stem-cell transplantation (ASCT). Most common grade ≥3 adverse events were leucopenia (31·4%) and thrombocytopenia (6·8%). The overall response rate (ORR) by investigator-based assessment was 85·4%. Most patients (74%) underwent successful central laboratory-based molecular cytogenetic analysis...
September 29, 2017: British Journal of Haematology
Hai-Ru Li, Hui Liu, Xin-Xin Tian, Wen-Yan Zan, Yue-Wen Mu, Hai-Gang Lu, Jun Li, Yue-Kui Wang, Si-Dian Li
Inspired by the recent discovery of the metal-centered tubular molecular rotor Cs B2-Ta@B18(-) with the record coordination number of CN = 20 and based on extensive first-principles theory calculations, we present herein the possibility of the largest tubular molecular rotors Cs B3-Ta@B18 (1) and C3v B4-Ta@B18(+) (2) and smallest axially chiral endohedral metalloborospherenes D2 Ta@B22(-) (3 and 3'), unveiling a tubular-to-cage-like structural transition in metal-centered boron clusters at Ta@B22(-)via effective spherical coordination interactions...
October 11, 2017: Physical Chemistry Chemical Physics: PCCP
Roberta Granese, Gloria Calagna, Giuliana Morabito, Carmine Carriero, Antonio Perino, Gabriele Tonni, Claudio Romano
PURPOSE: The aim of the study is to report a systematic review (from 2000 to 2017) of all pediatric cases of vulvar Crohn's disease (VCD) and to highlight the key-points for a correct diagnosis and management of this rare condition. METHODS: An electronic search using the Pubmed/Medline, Scopus, EMBASE, Cochrane database and Google Scholar database was performed according to PRISMA guidelines. RESULTS: Twenty pediatric studies and 22 cases of VCD were included for analysis...
September 25, 2017: Archives of Gynecology and Obstetrics
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