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https://www.readbyqxmd.com/read/29031179/carbosilane-metallodendrimers-based-on-copper-ii-complexes-synthesis-epr-characterization-and-anticancer-activity
#1
Natalia Sanz Del Olmo, Marta Maroto-Díaz, Rafael Gómez, Paula Ortega, Michela Cangiotti, M Francesca Ottaviani, F Javier de la Mata
A series of new organometallic carbosilane dendrimers functionalized with Copper(II) complex on the surface were synthesized and characterized as potential anticancer agents. These metallodendrimers were synthesized through the reaction of dendritic ligands containing N,N- and N,O- donor atoms able to act as chelating agents with CuCl2 as metallic ion precursor. The structural characterization of these complexes was addressed through the use of different analytical and spectroscopical techniques. Particularly, an electron paramagnetic resonance study was performed to corroborate the coordination properties of these dendritic ligands...
September 27, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29031141/analysis-of-spastic-gait-in-cervical-myelopathy-linking-compression-ratio-to-spatiotemporal-and-pedobarographic-parameters
#2
Taro Nagai, Yasuhito Takahashi, Kenji Endo, Ryo Ikegami, Ryuichi Ueno, Kengo Yamamoto
BACKGROUND: Gait dysfunction associated with spasticity and hyperreflexia is a primary symptom in patients with compression of cervical spinal cord. The objective of this study was to link maximum compression ratio (CR) to spatiotemporal/pedobarographic parameters. METHODS: Quantitative gait analysis was performed by using a pedobarograph in 75 elderly males with a wide range of cervical compression severity. CR values were characterized on T1-weighted magnetic resonance imaging (MRI)...
October 10, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29031123/electric-field-standing-wave-effects-in-internal-reflection-and-atr-spectroscopy
#3
Thomas G Mayerhöfer, Jürgen Popp
We investigate electric field standing wave effects in the system semiinfinite incidence medium with high index of refraction/layer/vacuum, the latter being the semiinfinite exit medium. If the layer has a lower index of refraction than the incidence medium, then very strong resonances occur between the two critical angles of the system defined by the systems incidence medium/layer and incidence medium/vacuum, as the layer is then a cavity. In particular close to the lower critical angles, the evanescent fields extend strongly into the exit medium...
October 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29031020/fetal-mri-lower-acceptance-by-women-in-research-vs-clinical-setting
#4
Bloeme J van der Knoop, Roland J Vermeulen, Jonathan I M L Verbeke, Lourens R Pistorius, Johanna I P de Vries
AIM: To determine acceptance of pregnant women to undergo fetal magnetic resonance imaging (MRI) examination in research and clinical setting. METHODS: A prospective study included a research group [part of a study comparing brain ultrasound (US) to MRI in fetuses at risk for acquired brain damage] and a clinical group [fetuses with suspected (brain) anomalies after structural US examination] from 2011 to 2014. All women were advised to use sedatives. MRI declinations, use of sedation, MRI duration and imaging quality were compared between both groups...
October 14, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/29029233/anticoagulation-combined-with-antiplatelet-therapy-in-patients-with-left-ventricular-thrombus-after-first-acute-myocardial-infarction
#5
Naoki Maniwa, Masashi Fujino, Michikazu Nakai, Kunihiro Nishimura, Yoshihiro Miyamoto, Yu Kataoka, Yasuhide Asaumi, Yoshio Tahara, Michio Nakanishi, Toshihisa Anzai, Kengo Kusano, Takashi Akasaka, Yoichi Goto, Teruo Noguchi, Satoshi Yasuda
Aims: There are limited data about the optimal anti-thrombotic therapy for preventing embolism while minimizing bleeding events in patients with first acute myocardial infarction (AMI) complicated by left ventricular thrombus (LVT). Methods and results: Among 2301 consecutive patients with AMI hospitalized between 2001 and 2014, we studied 1850 patients with first AMI who discharged alive to investigate clinical characteristics, incidence of systemic embolism (SE), and association between anticoagulation and embolic or bleeding events...
October 3, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29029139/quantitative-deformation-analysis-differentiates-ischaemic-and-non-ischaemic-cardiomyopathy-sub-group-analysis-of-the-vindicate-trial
#6
James R J Foley, Peter P Swoboda, Graham J Fent, Pankaj Garg, Adam K McDiarmid, David P Ripley, Bara Erhayiem, Tarique Al Musa, Laura E Dobson, Sven Plein, Klaus K Witte, John P Greenwood
Aims: To test the hypothesis that patients with ischaemic cardiomyopathy (ICM) and non-ischaemic cardiomyopathy (NICM) have different torsion and strain parameters, and compare to healthy, age-matched controls. VINDICATE investigated efficacy of high-dose vitamin D on patients with heart failure (HF) secondary to left ventricular (LV) systolic dysfunction of any aetiology. It is important to differentiate ICM and NICM as treatment and prognosis varies significantly. Cardiovascular magnetic resonance (CMR) reliably determines aetiology of HF and tissue tagging techniques are recognized as the reference standard measures of strain and torsion...
October 3, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29029119/the-end-of-the-unique-myocardial-band-part-ii-clinical-and-functional-considerations
#7
David H MacIver, John B Partridge, Peter Agger, Robert S Stephenson, Bastiaan J D Boukens, Camilla Omann, Jonathan C Jarvis, Henggui Zhang
Two of the leading concepts of mural ventricular architecture are the unique myocardial band and the myocardial mesh model. We have described, in an accompanying article published in this journal, how the anatomical, histological and high-resolution computed tomographic studies strongly favour the latter concept. We now extend the argument to describe the linkage between mural architecture and ventricular function in both health and disease. We show that clinical imaging by echocardiography and magnetic resonance imaging, and electrophysiological studies, all support the myocardial mesh model...
September 25, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29029096/novel-roles-of-glycosaminoglycans-in-the-degradation-of-type-i-collagen-by-cathepsin-k
#8
Yota Tatara, Shinichiro Suto, Ken Itoh
Glycosaminoglycans (GAGs) and collagen are the major organic components of bone matrix. However, their roles and functional relationships remain elusive. To investigate the role of GAGs in bone matrix degradation, the effects of GAGs on collagen were examined under acidic conditions that recapitulate the microenvironment of osteoclast resorption pits. We found that sulfated GAGs protect collagen fibrils against acid denaturation. Scanning electron microscopy demonstrated that collagen fibrils retain the fibril structure at pH 4...
October 4, 2017: Glycobiology
https://www.readbyqxmd.com/read/29029087/the-effect-of-sacubitril-valsartan-compared-to-olmesartan-on-cardiovascular-remodelling-in-subjects-with-essential-hypertension-the-results-of-a-randomized-double-blind-active-controlled-study
#9
Roland E Schmieder, Frank Wagner, Michael Mayr, Christian Delles, Christian Ott, Christian Keicher, Maja Hrabak-Paar, Tobias Heye, Solveig Aichner, Yasser Khder, Denise Yates, Diego Albrecht, Thomas Langenickel, Patrick Freyhardt, Rolf Janka, Jens Bremerich
Aims: Progressive aortic stiffening eventually leads to left ventricular (LV) hypertrophy and heart failure if left untreated. Anti-hypertensive agents have been shown to reverse this to some extent. The effects of sacubitril/valsartan (LCZ696), a dual-action angiotensin receptor blocker (ARB), and neprilysin inhibitor, on arterial stiffness and LV remodelling have not been investigated. Methods and results: This was a randomized, multi-centre, double-blind, double-dummy, active-controlled, parallel group, study to compare the effects on cardiovascular remodelling of sacubitril/valsartan with those of olmesartan in patients with hypertension and elevated pulse pressure...
September 27, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29029074/multimodality-imaging-evaluation-of-chagas-disease-an-expert-consensus-of-brazilian-cardiovascular-imaging-department-dic-and-the-european-association-of-cardiovascular-imaging-eacvi
#10
Maria Carmo P Nunes, Luigi Paolo Badano, J Antonio Marin-Neto, Thor Edvardsen, Covadonga Fernández-Golfín, Chiara Bucciarelli-Ducci, Bogdan A Popescu, Richard Underwood, Gilbert Habib, Jose Luis Zamorano, Roberto Magalhães Saraiva, Ester Cerdeira Sabino, Fernando A Botoni, Márcia Melo Barbosa, Marcio Vinicius L Barros, Eduardo Falqueto, Marcus Vinicius Simões, André Schmidt, Carlos Eduardo Rochitte, Manoel Otávio Costa Rocha, Antonio Luiz Pinho Ribeiro, Patrizio Lancellotti
Aims: To develop a document by Brazilian Cardiovascular Imaging Department (DIC) and the European Association of Cardiovascular Imaging (EACVI) to review and summarize the most recent evidences about the non-invasive assessment of patients with Chagas disease, with the intent to set up a framework for standardized cardiovascular imaging to assess cardiovascular morphologic and functional disturbances, as well as to guide the subsequent process of clinical decision-making. Methods and results: Chagas disease remains one of the most prevalent infectious diseases in Latin America, and has become a health problem in non-endemic countries...
September 25, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29028956/age-differences-in-the-neural-mechanisms-of-intertemporal-choice-under-subjective-decision-conflict
#11
Ben Eppinger, Hauke R Heekeren, Shu-Chen Li
Older decision-makers may capitalize on their greater experiences in financial decisions and by this offset decline in cognitive abilities. However, this pattern of results should reverse in situations that place high demands on cognitive control functions. In this study, we investigated how decision conflict affects the neural mechanisms of intertemporal decision-making in younger and older adults. To individually adjust the level of decision conflict we determined the indifference point (IDP) in intertemporal decision-making for each participant...
September 25, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29028948/volumes-of-the-spinal-canal-and-caudal-space-in-children-zero-to-three-years-of-age-assessed-by-magnetic-resonance-imaging-implications-for-volume-dosage-of-caudal-blockade
#12
J Forestier, P Castillo, T Finnbogason, M Lundblad, S Eksborg, P A Lönnqvist
Background: The primary aim of this study was to objectively assess the different spinal and caudal volumes that are of interest for caudal block volume dosing. Methods: Three directly assessed (volume of spinal canal/caudal space, volume of the dural sac and volume of spinal cord) and two derived volumes (volume of the epidural space and cerebrospinal fluid volume) were determined from magnetic resonance images (MRI) in 20 children (zero - three yr of age). The assessed volumes were correlated to age, height and weight...
September 27, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29028790/imaging-factors-that-distinguish-between-patients-with-asymptomatic-and-symptomatic-cervical-spondylotic-myelopathy-with-mild-to-moderate-cervical-spinal-cord-compression
#13
Jun Ming Cao, Jing Tao Zhang, Da Long Yang, Yi Peng Yang, He Huan Xia, Liu Yang
BACKGROUND Not all patients with spinal cord compression due to cervical spondylotic myelopathy (CSM) have clinical symptoms and signs. The aim of this study was to investigate and compare the imaging findings in asymptomatic and symptomatic patients with CSM with mild to moderate cervical spinal cord compression. MATERIAL AND METHODS A retrospective clinical study included 68 patients. Group A (n=30) had no symptoms and signs; group B (n=38) had symptoms and signs of cervical myelopathy. The age, sex, body mass index (BMI), history of steroid treatment, duration of symptoms, number of spondylotic cervical segments, Torg ratio, range of motion (ROM), incidence of cervical segmental instability, overall curvature of the cervical spine, direction of spinal cord compression, and spinal cord magnetic resonance imaging (MRI) signal intensity were compared...
October 13, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29028649/-18f-thk5351-pet-imaging-in-patients-with-semantic-variant-primary-progressive-aphasia
#14
Hyon Lee, Seongho Seo, Sang-Yoon Lee, Hye Jin Jeong, Sung-Ho Woo, Kyoung-Min Lee, Yeong-Bae Lee, Kee Hyung Park, Jae-Hyeok Heo, Cindy W Yoon, Jae Myeong Kang, Jaelim Cho, Nobuyuki Okamura, Shozo Furumoto, Kazuhiko Yanai, Duk L Na, Tatsuo Ido, Victor L Villemagne, Young Noh
BACKGROUND: Semantic variant primary progressive aphasia (svPPA) has been associated with a variety of proteinopathies, mainly transactive response DNA-binding protein, but also with tau and β-amyloid. Recently selective tau tracers for positron emission tomography (PET) have been developed to determine the presence of cerebral tau deposits in vivo. Here, we investigated the topographical distribution of THK5351 in svPPA patients. MATERIALS AND METHODS: Five svPPA patients, 14 Alzheimer's disease patients, and 15 age-matched normal controls underwent [F]-THK5351 PET scans, magnetic resonance imaging, and detailed neuropsychological tests...
October 12, 2017: Alzheimer Disease and Associated Disorders
https://www.readbyqxmd.com/read/29028584/diagnosis-and-treatment-options-for-sequelae-following-radiation-treatment-of-brain-tumors
#15
REVIEW
Swapnil Mehta, Aatman Shah, Henry Jung
Radiation serves an important role in the treatment of metastatic and primary brain tumors. Radiation carries a risk of post radiation treatment effects, such as pseudoprogression and radiation necrosis. The ability to differentiate between radiation necrosis, pseudoprogression, and tumor recurrence remains a diagnostic conundrum with varying treatment options. In this review, we will discuss the pathophysiology, diagnostic imaging modalities, and treatments of these post-radiation treatment effects. We focus on the latest developments in magnetic resonance imaging (MRI) modalities including imaging biomarkers and the newest therapeutics such as VEGF inhibitors, Hyperbaric Oxygen Therapy, sensitized cytotoxic T cells, and Laser Interstitial Thermal Therapy (LITT)...
October 7, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29028542/spectral-diffusion-and-dynamic-nuclear-polarization-beyond-the-high-temperature-approximation
#16
W Th Wenckebach
Dynamic Nuclear Polarization (DNP) has proven itself most powerful for the orientation of nuclear spins in polarized targets and for hyperpolarization in magnetic resonance imaging (MRI). Unfortunately, the theoretical description of some of the processes involved in DNP invokes the high temperature approximation, in which Boltzmann factors are expanded up to first order, while the high electron and nuclear spin polarization required for many applications do not justify such an approximation. A previous article extended the description of one of the mechanisms of DNP-thermal mixing-beyond the high temperature approximation (Wenckebach, 2017)...
October 4, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29028512/the-ectopic-accessory-parotid-system-a-new-patient-studied-through-magnetic-resonance-imaging
#17
Mainak Dutta, Indranil Chatterjee, Soham Roy
The ectopic accessory parotid system (EAPS) connotes an extra parotid tissue with its ductal outlet that is morphologically distinct from the main parotid gland and its drainage system. Clinically presenting as a saliva-draining cheek fistula near the oral commissure, this rare congenital anomaly is almost always associated with ipsilateral preauricular appendages and occasional mandibular hypoplasia, and is considered a variant of the oculo-auriculo-vertebral spectrum. This report discusses the embryology, clinical details, and management aspects in a new patient, highlighting the role of magnetic resonance imaging in, for the first time, tracking the ectopic salivary system, and establishing its independent existence...
September 21, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/29028511/a-pictorial-review-of-diagnostic-pitfalls-of-developmental-anomalies-and-variants-in-pancreatic-imaging
#18
REVIEW
Jong Eun Lee, Sang Soo Shin, Shin Jung Kim, Suk Hee Heo, Hyo Soon Lim, Jin Woong Kim, Yong Yeon Jeong
Developmental anomalies and anatomic variants of the pancreas vary widely, and most of them are encountered incidentally during radiologic evaluation. However, some of these anomalies and variants are potentially pathologic and may cause various clinical presentations in childhood or adulthood. The early identification of these entities in various imaging modalities including ultrasound, computed tomography (CT), and magnetic resonance (MR) imaging would be valuable in making correct diagnoses and, in turn, preventing unnecessary additional procedures...
September 19, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/29028407/synthesis-of-carboxylated-styrene-polymer-for-internal-calibration-of-fourier-transform-ion-cyclotron-resonance-mass-spectrometry-of-humic-substances
#19
Alexander Zherebker, Alexandra V Turkova, Yury Kostyukevich, Alexey Kononikhin, Kirill V Zaitsev, Igor A Popov, Eugene Nikolaev, Irina V Perminova
We report synthesis and application of the novel carboxylated styrene for internal calibration of Fourier transform ion cyclotron resonance mass-spectra of humic substances. The calibrant was synthesized in five steps from acetylsalicylic acid (aspirin) followed by spontaneous polymerization of vinyl salicylic acid. Aromatic nature of the prepared polymer enabled its simultaneous analysis in the presence of the Suwannee River fulvic acid without using dual-spray approach. The major advantage of the calibrant proposed in this study is a lack of suppression of humic substances signals and maintenance of peak intensity distribution...
August 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29028404/static-harmonization-of-dynamically-harmonized-fourier-transform-ion-cyclotron-resonance-cell
#20
Ekaterina Zhdanova, Yury Kostyukevich, Eugene Nikolaev
Static harmonization in the Fourier transform ion cyclotron resonance cell improves the resolving power of the cell and prevents dephasing of the ion cloud in the case of any trajectory of the charged particle, not necessarily axisymmetric cyclotron (as opposed to dynamic harmonization). We reveal that the Fourier transform ion cyclotron resonance cell with dynamic harmonization (paracell) is proved to be statically harmonized. The volume of the statically harmonized potential distribution increases with an increase in the number of trap segments...
August 2017: European Journal of Mass Spectrometry
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