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https://www.readbyqxmd.com/read/28319797/non-enolisable-knoevenagel-condensate-appended-schiff-bases-metal-ii-complexes-spectral-characteristics-dna-binding-and-nuclease-activities
#1
Ammavasi Gubendran, Mookkandi Palsamy Kesavan, Srinivasan Ayyanaar, Liviu Mitu, Periyakaruppan Athappan, Jegathalaprathaban Rajesh
New Schiff base complexes [Cu(L(1))Cl] (1), [Ni(L(1))Cl] (2), [Zn(L(1))Cl] (3), and [Fe(L(2))H2OCl] (4) {L(1)=(4E)-3-(2-hydroxybenzylidene)-4-(2-hydroxyphenylimino)pentan-2-one, L(2)=2,2'-(1E,1'E)-(3-(2-hydroxybenzylidene)-pentane-2,4-diylidene)bis(azan-1-yl-1 idene)diphenol} have been synthesized and characterized by elemental analysis, UV-Vis, IR, FAB-mass, EPR, spectral studies and electrochemical studies, the ligands L(1) &L(2) were characterized by (1)H and (13)C NMR spectra. Complex 1 show a visible spectral d-d band near 600nm and display cyclic voltammetric quasireversible response for the Cu(II)/Cu(I) couple vs Ag/AgCl in DMSO...
March 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28319390/qualitative-behavior-of-the-low-frequency-vibrational-dynamics-of-microtubules-and-the-surrounding-water
#2
Jeremy M Moix, James E Parker, Ibtissam Echchgadda
The dynamics of the low-frequency vibrational modes of microtubules play a key role in many theoretical models regarding their biological function. We analyze these dynamics through large scale, classical molecular dynamics simulations of a microtubule composed of 42 tubulin heterodimers to provide insights into the qualitative nature of the vibrational energy absorption and dissipation mechanisms. The computed microtubule absorption spectra and vibrational density of states in the terahertz regime are presented, along with an analysis of the vibrational dephasing rates of the tubulin monomer center of mass dynamics, which are shown to be overdamped...
March 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28319376/anomalous-protein-protein-interactions-in-multivalent-salt-solution
#3
Coralie Pasquier, Mario Vazdar, Jan Forsman, Pavel Jungwirth, Mikael Lund
The stability of aqueous protein solutions is strongly affected by multivalent ions, which induce ion-ion correlations beyond the scope of classical mean-field theory. Using all-atom Molecular Dynamics (MD) and coarse grained Monte Carlo (MC) simulations, we investigate the interaction between a pair of protein molecules in 3:1 electrolyte solution. In agreement with available experimental findings of "reentrant protein condensation", we observe an anomalous trend in the protein-protein potential of mean force with increasing electrolyte concentration in the order: (i) double-layer repulsion, (ii) ion-ion correlation attraction, (iii) over-charge repulsion, and in excess of 1:1 salt, (iv) non Coulombic attraction...
March 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28318960/lab-scale-pyrolysis-of-the-automotive-shredder-residue-light-fraction-and-characterization-of-tar-and-solid-products
#4
Manuela Anzano, Elena Collina, Elsa Piccinelli, Marina Lasagni
The general aim of this study is the recovery of Automotive Shredder Residue (ASR). The ASR light fraction, or car fluff, that was collected at an Italian shredding plant was pyrolysed at various temperatures (500-800°C) in a lab-scale reactor. The condensable gases (tar) and solid residue yields increased with decreasing temperature, and these products were characterized to suggest a potential use to reclaim them. The higher heating value (HHV) of tar was 34-37MJ/kg, which is comparable with those of fossil fuels...
March 16, 2017: Waste Management
https://www.readbyqxmd.com/read/28318946/easy-and-rapid-preparation-of-benzoylhydrazides-and-their-diazene-derivatives-as-inhibitors-of-15-lipoxygenase
#5
Cristian Tirapegui, Williams Acevedo-Fuentes, Pablo Dahech, Claudia Torrent, Pablo Barrias, Macarena Rojas-Poblete, Carolina Mascayano
Two series of diaza derivatives were prepared by solvent-free condensation of benzoic acid and 4-substituted phenylhydrazines in order to obtain phenylhydrazides (HYD series) and, by oxidation of these compounds, the corresponding benzoyldiazenes (DIA series). Both sets were evaluated as inhibitors of soybean 15-lipoxygenase activity and antioxidant capability in the FRAP and CUPRAC assays. The most potent inhibitors of both series exhibited IC50 values in the low micromolar range. Kinetic studies showed that at least the more active compounds were competitive inhibitors...
March 8, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28318261/expanded-rosarin-a-versatile-fullerene-c60-receptor
#6
Xian-Sheng Ke, Taeyeon Kim, James T Brewster, Vincent M Lynch, Dongho Kim, Jonathan L Sessler
An expanded rosarian (P3P6) with a bowl-like conformation has been prepared and characterized. It is prepared in a one pot procedure that involves condensing a bispyrrole pyridine precursor (P1P2) with benzaldehyde, followed by oxidation. Single crystal X-ray diffraction analysis reveals a bowl-like conformation in the solid state with an upper rim diameter defined by the meso-phenyl substituents of ca. 13.5 Å and a depth of roughly 6.3 Å. P3P6 forms both 1:1 and 2:1 complexes with C60 in the solid state...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28318235/unusual-tri-hexa-and-nonanuclear-cu-ii-cage-methylsilsesquioxanes-synthesis-structures-and-catalytic-activity-in-oxidations-with-peroxides
#7
Alexey N Bilyachenko, Alena N Kulakova, Mikhail M Levitsky, Artem A Petrov, Alexander A Korlyukov, Lidia S Shul'pina, Victor N Khrustalev, Pavel V Dorovatovskii, Anna V Vologzhanina, Ulyana S Tsareva, Igor E Golub, Ekaterina S Gulyaeva, Elena S Shubina, Georgiy B Shul'pin
Three types of unusual cagelike copper(II) methylsilsesquioxanes, namely, nona- [(MeSiO1.5)18(CuO)9] 1, hexa- [(MeSiO1.5)10(HO0.5)2(CuO)6(C12H8N2)2(MeSiO1.5)10(HO0.5)1.33(CH3COO0.5)0.67(CuO)6(C12H8N2)2] 2, [(MeSiO1.5)10(CuO)6(MeO0.5)2(C10H8N2)2] 3, and trinuclear [(MeSiO1.5)8(CuO)3(C10H8N2)2] 4, were obtained in 44%, 27%, 20%, and 16% yields, respectively. Nuclearity and structural fashion of products was controlled by the choice of solvent system and ligand, specifically assisting the assembling of cage. Structures of 1-4 were determined by single-crystal X-ray diffraction analysis...
March 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28317995/in-situ-deprotection-and-dynamic-covalent-assembly-using-a-dual-role-catalyst
#8
T Wei, J C Furgal, T F Scott
Utilization of constituent molecular precursors bearing covalently coreactive functional groups for self-assembly risks premature reaction, impeding synthetic and purification efforts. To prevent premature amine-aldehyde condensation for oligomers bearing both groups, we employ a dual-role Lewis acid catalyst for both in situ acetal deprotection and subsequent imine exchange, effecting oligomer assembly.
March 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28317462/witnesses-in-the-consultation-room-experiences-of-peer-group-supervision
#9
Helena Galina Nielsen, Annette Sofie Davidsen
BACKGROUND: In Denmark group supervision for general practitioners is an established part of continuing professional development. Several different approaches are used, including Balint Groups and Bendix Groups. The aim of this paper is to describe the benefits and challenges of a peer group supervision model with the role of supervisor taken by group members in turn. The setting was a group of general practitioners using a patient-centred consultation model and video-recordings of consultations...
March 19, 2017: Education for Primary Care
https://www.readbyqxmd.com/read/28317201/anionic-derivatives-of-perfluorinated-trimethylgold
#10
Babil Menjón, Alberto Pérez-Bitrián, Sonia Martínez-Salvador, Miguel Baya, José María Casas, Antonio Martín, Jesús Orduna
The homoleptic compound [PPh₄][CF₃AuCF₃] cleanly undergoes photoinduced oxidative addition of CF₃I to afford the organogold(III) derivative [PPh₄][(CF₃)₃AuI] in good yield and under mild conditions. This compound provides a convenient entry to the chemistry of the perfluorinated (CF₃)₃Au fragment whose properties are analyzed with the aid of DFT methods and compared with those of the homologous non-fluorinated (CH₃)₃Au moiety. It is found that reductive elimination of CX₃-CX₃ in the former (X = F) requires a much higher energy barrier than in the latter (X = H) and is therefore considerably less favored...
March 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28317181/cyclic-bisporphyrin-based-flexible-molecular-containers-controlling-guest-arrangements-and-supramolecular-catalysis-by-tuning-cavity-size
#11
Sankar Prasad Rath, Pritam Mondal, Sabyasachi Sarkar
Three cyclic zinc(II) bisporphyrins (CB) with highly flexible linkers are employed as artificial molecular containers that efficiently encapsulate/coordinate various aromatic aldehydes within their cavities. Interestingly, the arrangements of the guests and their reactivity inside the molecular clefts are significantly influenced by the cavity size. In presence of polycyclic aromatic aldehydes such as 3-formylperylene as a guest, the cyclic bisporphyrin host having smaller cavity (CB1) forms 1:1 sandwich complex...
March 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28315859/heteromorphism-of-homomorphic-sex-chromosomes-in-two-anole-species-squamata-dactyloidae-revealed-by-synaptonemal-complex-analysis
#12
Artem P Lisachov, Vladimir A Trifonov, Massimo Giovannotti, Malcolm A Ferguson-Smith, Pavel M Borodin
Iguanians (Pleurodonta) are one of the reptile lineages that, like birds and mammals, have sex chromosomes of ancient origin. In most iguanians these are microchromosomes, making a distinction between the X and Y as well as between homeologous sex chromosomes in other species difficult. Meiotic chromosome analysis may be used to elucidate their differentiation, because meiotic prophase chromosomes are longer and less condensed than metaphase chromosomes, and the homologues are paired with each other, revealing minor heteromorphisms...
March 18, 2017: Cytogenetic and Genome Research
https://www.readbyqxmd.com/read/28314432/-consensus-document-on-the-management-and-follow-up-of-the-male-with-lower-urinary-tract-symptoms-secondary-to-benign-prostate-hyperplasia
#13
F J Brenes Bermúdez, F Brotons Muntó, J Castiñeiras Fernández, J M Cozar Olmo, A Fernández-Pro Ledesma, J A Martín Jiménez, M L Martínez-Berganza Asensio, B Miñana López, J M Molero García
Benign prostate hyperplasia (BPH) is a high-incidence condition. Its diagnosis and treatment is shared between urologists and Primary Care physicians. Its management uses up a significant amount of resources. The Spanish Society of Primary Care Physicians (SEMERGEN), the Spanish Society of General Practitioners and Family Doctors (SEMG), the Spanish Society of Family and Community Medicine (semFYC), and the Spanish Association of Urology (AEU) have prepared a document on the management and monitoring of BPH, in which the aim is to incorporate the latest evidence in order to update the previously published guidelines, and present them here in condensed form...
November 2016: Semergen
https://www.readbyqxmd.com/read/28314260/induction-of-apoptosis-in-human-oral-keratinocyte-by-doxorubicin
#14
Hiroshi Sakagami, Noriyuki Okudaira, Yoshiko Masuda, Osamu Amano, Satoshi Yokose, Yumiko Kanda, Madoka Suguro, Takenori Natori, Hiroshi Oizumi, Takaaki Oizumi
BACKGROUND/AIM: We have previously reported that doxorubicin (DXR) showed much higher cytotoxicity against human oral squamous cell carcinoma cell lines compared to normal human mesenchymal normal oral cells (gingival fibroblast, periodontal ligament fibroblast, pulp cell), yielding high tumor-specificity. However, we unexpectedly found that doxorubicin showed potent cytotoxicity against human normal oral keratinocytes and primary gingival epithelial cells. In the present study, we investigated the reproducibility, underlining mechanisms and generality of this unexpected finding...
March 2017: Anticancer Research
https://www.readbyqxmd.com/read/28306318/magnetic-trapping-of-cold-methyl-radicals
#15
Yang Liu, Manish Vashishta, Pavle Djuricanin, Sida Zhou, Wei Zhong, Tony Mittertreiner, David Carty, Takamasa Momose
We have demonstrated that a supersonic beam of methyl radicals (CH_{3}) in the ground rotational state of both para and ortho species has been slowed down to standstill with a magnetic molecular decelerator, and successfully captured spatially in an anti-Helmholtz magnetic trap for >1  s. The trapped CH_{3} radicals have a mean translational temperature of about 200 mK with an estimated density of >5.0×10^{7}  cm^{-3}. The methyl radical is an ideal system for the study of cold molecules not only because of its high reactivities at low temperatures, but also because further cooling below 1 mK is plausible via sympathetic cooling with ultracold atoms...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28306276/condensation-on-highly-superheated-surfaces-unstable-thin-films-in-a-wickless-heat-pipe
#16
Akshay Kundan, Thao T T Nguyen, Joel L Plawsky, Peter C Wayner, David F Chao, Ronald J Sicker
A wickless heat pipe was operated on the International Space Station to provide a better understanding of how the microgravity environment might alter the physical and interfacial forces driving evaporation and condensation. Traditional heat pipes are divided into three zones: evaporation at the heated end, condensation at the cooled end, and intermediate or adiabatic in between. The microgravity experiments reported herein show that the situation may be dramatically more complicated. Beyond a threshold heat input, there was a transition from evaporation at the heated end to large-scale condensation, even as surface temperatures exceeded the boiling point by 160 K...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28306269/magnetic-domain-wall-floating-on-a-spin-superfluid
#17
Pramey Upadhyaya, Se Kwon Kim, Yaroslav Tserkovnyak
We theoretically investigate the transfer of angular momentum between a spin superfluid and a domain wall in an exchange coupled easy-axis and easy-plane magnetic insulator system. A domain wall in the easy-axis magnet absorbs spin angular momentum via disrupting the flow of a superfluid spin current in the easy-plane magnet. Focusing on an open geometry, where the spin current is injected electrically via a nonequilibrium spin accumulation, we derive analytical expressions for the resultant superfluid-mediated motion of the domain wall...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28306244/recent-advances-in-ultrathin-two-dimensional-nanomaterials
#18
Chaoliang Tan, Xiehong Cao, Xue-Jun Wu, Qiyuan He, Jian Yang, Xiao Zhang, Junze Chen, Wei Zhao, Shikui Han, Gwang-Hyeon Nam, Melinda Sindoro, Hua Zhang
Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances...
March 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28306166/noncentrosymmetric-magnets-hosting-magnetic-skyrmions
#19
REVIEW
Naoya Kanazawa, Shinichiro Seki, Yoshinori Tokura
The concept of a skyrmion, which was first introduced by Tony Skyrme in the field of particle physics, has become widespread in condensed matter physics to describe various topological orders. Skyrmions in magnetic materials have recently received particular attention; they represent vortex-like spin structures with the character of nanometric particles and produce fascinating physical properties rooted in their topological nature. Here, a series of noncentrosymmetric ferromagnets hosting skyrmions is reviewed: B20 metals, Cu2 OSeO3 , Co-Zn-Mn alloys, and GaV4 S8 , where Dzyaloshinskii-Moriya interaction plays a key role in the stabilization of skyrmion spin texture...
March 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28304370/identification-of-dimethylamine-monooxygenase-in-marine-bacteria-reveals-a-metabolic-bottleneck-in-the-methylated-amine-degradation-pathway
#20
Ian Lidbury, Michaela A Mausz, David J Scanlan, Yin Chen
Methylated amines (MAs) are ubiquitous in the marine environment and their subsequent flux into the atmosphere can result in the formation of aerosols and ultimately cloud condensation nuclei. Therefore, these compounds have a potentially important role in climate regulation. Using Ruegeria pomeroyi as a model, we identified the genes encoding dimethylamine (DMA) monooxygenase (dmmABC) and demonstrate that this enzyme degrades DMA to monomethylamine (MMA). Although only dmmABC are required for enzyme activity in recombinant Escherichia coli, we found that an additional gene, dmmD, was required for the growth of R...
March 17, 2017: ISME Journal
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