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https://www.readbyqxmd.com/read/28330299/detection-of-antimicrobial-traits-in-fluorescent-pseudomonads-and-molecular-characterization-of-an-antibiotic-pyoluteorin
#1
J U Vinay, M K Naik, R Rangeshwaran, G Chennappa, Sohel S Shaikh, R Z Sayyed
Thirty isolates of fluorescent pseudomonads were obtained from rhizosphere of different crops in Raichur, India. The fluorescent pseudomonad strains were characterized in vitro for biochemical traits, antimicrobial traits, and pyoluteorin antibiotic production. All the isolates that showed fluorescent pigment production under UV light were rod shaped, Gram negative, positive for oxidase, catalase and citrate utilization tests, and negative for indole test. Out of 30 isolates, 07 isolates were positive for HCN production, 15 isolates were positive for H2S production, and all the isolates were positive for siderophore production...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330242/phylogenetical-coherence-of-pseudomonas-in-unexplored-soils-of-himalayan-region
#2
Stuti Sah, Rajni Singh
Pseudomonas, an enormously diverse genus of the γ-Proteobacteria, is an important member of soil microbial communities. In this study, genetic heterogeneity and plant growth promotory property of Pseudomonas was compared within the group Pseudomonas sensu stricto isolated from the lesser explored niches of Himalayan region. A significant difference (P < 0.001 in total Pseudomonas count) was observed among the six types of soil samples collected from oak forest, fine forest, and agricultural soil. The highest numbers of bacteria were isolated from oak forest soil followed by pine forest soil and agricultural soil...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28321654/theoretical-insight-into-the-bh3%C3%A2-hcn-adsorption-on-the-co-100-and-co-110-surfaces-as-hydrogen-storage
#3
He Zhao, Fu-de Ren, Yan-Hong Wang
Fifteen configurations and adsorption energies of the adsorption sites of BH3∙∙∙HCN on Co(100) and Co(110) surfaces were investigated using the density functional theory. The results show that after BH3∙∙∙HCN is adsorbed, although there is no general behavior for the H∙∙∙H distances, the adsorption energies of BH3∙∙∙HCN are always far stronger than those of H2 on Co surfaces, suggesting that the dihydrogen-bonded complex, one kind of prospective material for reversible hydrogen storage, can be tightly adsorbed on the surfaces of metals...
April 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28295026/neuronal-entry-and-high-neurotoxicity-of-botulinum-neurotoxin-a-require-its-n-terminal-binding-sub-domain
#4
Jiafu Wang, Jianghui Meng, Marc Nugent, Minhong Tang, J Oliver Dolly
Botulinum neurotoxins (BoNTs) are the most toxic proteins known, due to inhibiting the neuronal release of acetylcholine and causing flaccid paralysis. Most BoNT serotypes target neurons by binding to synaptic vesicle proteins and gangliosides via a C-terminal binding sub-domain (HCC). However, the role of their conserved N-terminal sub-domain (HCN) has not been established. Herein, we created a mutant form of recombinant BoNT/A lacking HCN (rAΔHCN) and showed that the lethality of this mutant is reduced 3...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28289203/storage-and-release-of-hydrogen-cyanide-in-a-chelicerate-oribatula-tibialis
#5
Adrian Brückner, Günther Raspotnig, Katja Wehner, Reinhard Meusinger, Roy A Norton, Michael Heethoff
Cyanogenesis denotes a chemical defensive strategy where hydrogen cyanide (HCN, hydrocyanic or prussic acid) is produced, stored, and released toward an attacking enemy. The high toxicity and volatility of HCN requires both chemical stabilization for storage and prevention of accidental self-poisoning. The few known cyanogenic animals are exclusively mandibulate arthropods (certain myriapods and insects) that store HCN as cyanogenic glycosides, lipids, or cyanohydrins. Here, we show that cyanogenesis has also evolved in the speciose Chelicerata...
March 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28287664/gold-setting-the-gold-standard-among-transition-metals-as-a-hydrogen-bond-acceptor-a-theoretical-investigation
#6
Ferdinand Groenewald, Helgard G Raubenheimer, Jan Dillen, Catharine Esterhuysen
The Au(i) atom of dimethylaurate (DMA) is shown to behave as a hydrogen-bond acceptor, providing theoretical evidence that it can act as a Lewis base. Calculations at the MP2/aug-cc-pVTZ-pp level of theory confirm that DMA forms hydrogen bonds decreasing in strength from -16.2 kcal mol(-1) to -2.4 kcal mol(-1) in the order HCN ≈ HF > H2O > HCCH > NH3 > CH4, i.e. following the trend of decreasing proton acidity of the hydrogen-bond donor. The geometrical and Atoms in Molecules (AIM) parameters of the hydrogen-bonded adducts compare well to those obtained with the auride anion, a known hydrogen-bond acceptor...
March 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28286469/the-ih-channel-gene-promotes-synaptic-transmission-and-coordinated-movement-in-drosophila-melanogaster
#7
Andrew P Hegle, C Andrew Frank, Anthony Berndt, Markus Klose, Douglas W Allan, Eric A Accili
Hyperpolarization-activated cyclic nucleotide-gated "HCN" channels, which underlie the hyperpolarization-activated current (Ih), have been proposed to play diverse roles in neurons. The presynaptic HCN channel is thought to both promote and inhibit neurotransmitter release from synapses, depending upon its interactions with other presynaptic ion channels. In larvae of Drosophila melanogaster, inhibition of the presynaptic HCN channel by the drug ZD7288 reduces the enhancement of neurotransmitter release at motor terminals by serotonin but this drug has no effect on basal neurotransmitter release, implying that the channel does not contribute to firing under basal conditions...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28285444/the-interaction-strengths-and-spectroscopy-parameters-of-the-c2h2%C3%A2-%C3%A2-%C3%A2-hx-and-hcn%C3%A2-%C3%A2-%C3%A2-hx-complexes-x-f-cl-cn-and-cch-and-related-ternary-systems-valued-by-fluxes-of-charge-densities-qtaim-ccfo-and-nbo-calculations
#8
Marco A A Viana, Regiane C M U Araújo, José A Maia Neto, Henrique C Chame, Arquimedes M Pereira, Boaz G Oliveira
This theoretical work exhibits a new systematic study of structural parameters, electronic properties, infrared vibration modes, and molecular topography of hydrogen complexes, namely linear-type HCN⋯HX and T-type C2H2⋯HX (X = F, Cl, CN, and CCH). Ideally, the knowledge of the ternary systems of C2H2⋯HCN⋯HF and HCN⋯HCN⋯HF whose subparts integrate the linear and T-shaped complexes were used to give support in this current research. By means of computational calculations carried out in both levels B3LYP and MP2, the variations of the HX bond lengths are clearly overestimated in the HCN⋯HX linear complexes...
April 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28285373/rhizobia-a-potential-biocontrol-agent-for-soilborne-fungal-pathogens
#9
REVIEW
Krishnashis Das, Radha Prasanna, Anil Kumar Saxena
Rhizobia are a group of organisms that are well known for their ability to colonize root surfaces and form symbiotic associations with legume plants. They not only play a major role in biological nitrogen fixation but also improve plant growth and reduce disease incidence in various crops. Rhizobia are known to control the growth of many soilborne plant pathogenic fungi belonging to different genera like Fusarium, Rhizoctonia, Sclerotium, and Macrophomina. Antagonistic activity of rhizobia is mainly attributed to production of antibiotics, hydrocyanic acid (HCN), mycolytic enzymes, and siderophore under iron limiting conditions...
March 12, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28280415/effects-of-acidic-ph-on-voltage-gated-ion-channels-in-rat-trigeminal-mesencephalic-nucleus-neurons
#10
Jin-Eon Han, Jin-Hwa Cho, In-Sun Choi, Do-Yeon Kim, Il-Sung Jang
The effects of acidic pH on several voltage-dependent ion channels, such as voltage-dependent K(+) and Ca(2+) channels, and hyperpolarization-gated and cyclic nucleotide-activated cation (HCN) channels, were examined using a whole-cell patch clamp technique on mechanically isolated rat mesencephalic trigeminal nucleus neurons. The application of a pH 6.5 solution had no effect on the peak amplitude of voltage-dependent K(+) currents. A pH 6.0 solution slightly, but significantly inhibited the peak amplitude of voltage-dependent K(+) currents...
March 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/28244243/angiotensin-ii-causes-apoptosis-of-adult-hippocampal-neural-stem-cells-and-memory-impairment-through-the-action-on-ampk-pgc1%C3%AE-signaling-in-heart-failure
#11
Min-Seok Kim, Geun-Hee Lee, Yong-Min Kim, Byoung-Wook Lee, Hae Yun Nam, U-Cheol Sim, Suk-Jung Choo, Seong-Woon Yu, Jae-Joong Kim, Yunhee Kim Kwon, Seong Who Kim
Data are limited on the mechanisms underlying memory impairment in heart failure (HF). We hypothesized that angiotensin II (Ang II) may determine the fate of adult hippocampal neural stem cells (HCNs), a cause of memory impairment in HF. HCNs with neurogenesis potential were isolated and cultured from adult rat hippocampi. Ang II decreased HCN proliferation in dose- and time-dependent manners. Moreover, Ang II treatment (1 µM) for 48 hours induced apoptotic death, which was attenuated by pretreatment with Ang II receptor blockers (ARBs)...
February 28, 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28239369/plant-growth-promoting-bacteria-associated-with-langsdorffia-hypogaea-rhizosphere-host-biological-interface-a-neglected-model-of-bacterial-prospection
#12
Érica B Felestrino, Iara F Santiago, Luana da Silva Freitas, Luiz H Rosa, Sérvio P Ribeiro, Leandro M Moreira
Soil is a habitat where plant roots and microorganisms interact. In the region of the Brazilian Iron Quadrangle (IQ), studies involving the interaction between microbiota and plants have been neglected. Even more neglected are the studies involving the holoparasite plant Langsdorffia hypogaea Mart. (Balanophoraceae). The geomorphological peculiarities of IQ soil, rich in iron ore, as well as the model of interaction between L. hypogaea, its hosts and the soil provide a unique niche that acts as selective pressure to the evolution of plant growth-promoting bacteria (PGPB)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28235872/role-and-characterization-of-a-cyanide-induced-3-cyanoalanine-nitrilase-in-the-cyanide-assimilating-bacterium-pseudomonas-pseudoalcaligenes-cect-5344
#13
Felipe Acera, María Isabel Carmona, Francisco Castillo, Alberto Quesada, Rafael Blasco
Pseudomonas pseudoalcaligenes CECT 5344 is a bacterium able to assimilate cyanide as the sole nitrogen source. Under this growth conditions, a 3-cyanoalanine nitrilase enzymatic activity was induced. This activity was coded by nit4, one of the four nitrilases detected in the genome of this bacterium, and its expression in E. coli enabled the recombinant strain to fully assimilate 3-cyanoalanine. P. pseudoalcaligenes CECT 5344 showed a weak growth level with 3-cyanoalanine as N-source, unless KCN was also added...
February 24, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28224911/determination-of-total-cyanide-in-soil-by-isotope-dilution-gc-ms-following-pentafluorobenzyl-derivatization
#14
Beatrice Campanella, Lorenzo Biancalana, Lucia D'Ulivo, Massimo Onor, Emilia Bramanti, Zoltan Mester, Enea Pagliano
The high toxicity of cyanide, along with its widespread industrial use, has fuelled interest in the development of analytical methods for its determination in complex matrices. In this study, we propose a novel approach for the measurement of total cyanide in soil samples based on single-step derivatization with pentafluorobenzyl bromide (F5Bn-Br) followed by quantitation with gas chromatography mass spectrometry in negative chemical ionization mode. The reaction between CN(-) and F5Bn-Br resulted in the identification of several derivatives such as F5Bn-CN, (F5Bn)(F5Ph)CH-CN, and (F5Bn)2(F5Ph)C-CN...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28223197/bethesda-category-iii-iv-and-v-thyroid-nodules-can-nodule-size-help-predict-malignancy
#15
Colleen M Kiernan, Carmen C Solórzano
BACKGROUND: The association of tumor size with malignancy in thyroid nodules with indeterminate cytology (atypia of undetermined significance [AUS]/follicular lesion of undetermined significance [FLUS], suspicious for follicular neoplasm [SFN]/Hürthle cell neoplasm [HCN], and suspicious for malignancy [SM]) has not been clearly studied. STUDY DESIGN: We retrospectively identified 1,104, patients who underwent thyroid FNA and subsequent thyroidectomy. Patients with indeterminate cytology were reviewed...
February 20, 2017: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/28218316/theoretical-study-of-hcn-water-interaction-five-dimensional-potential-energy-surfaces
#16
Ernesto Quintas Sánchez, Marie-Lise Dubernet
A new five-dimensional potential energy surface is calculated at the coupled-cluster CCSD(T) level of theory for the HCN-water system, treating both monomers as rigid rotors. The associated methodology, which combines extensive ab initio calculations of moderate accuracy (CCSD(T)/AVDZ) and a fitting procedure involving a much lower angular coverage with more accurate ab initio calculations (CCSD(T)/CBS), is described in detail. This methodology provides a time-saving approach to compute quantitatively accurate potential energy surfaces with reasonable computational effort...
February 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28208624/an-optoelectronic-equivalent-narrowband-filter-for-high-resolution-optical-spectrum-analysis
#17
Kunpeng Feng, Jiwen Cui, Hong Dang, Weidong Wu, Xun Sun, Xuelin Jiang, Jiubin Tan
To achieve a narrow bandwidth optical filter with a wide swept range for new generation optical spectrum analysis (OSA) of high performance optical sensors, an optoelectronic equivalent narrowband filter (OENF) was investigated and a swept optical filter with bandwidth of several MHz and sweep range of several tens of nanometers was built using electric filters and a sweep laser as local oscillator (LO). The principle of OENF is introduced and analysis of the OENF system is presented. Two electric filters are optimized to be RBW filters for high and medium spectral resolution applications...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28181007/regulation-of-hcn-ion-channels-by-non-canonical-cyclic-nucleotides
#18
Bryan VanSchouwen, Giuseppe Melacini
The hyperpolarization-activated cyclic-nucleotide-modulated (HCN) proteins are cAMP-regulated ion channels that play a key role in nerve impulse transmission and heart rate modulation in neuronal and cardiac cells, respectively. Although they are regulated primarily by cAMP, other cyclic nucleotides such as cGMP, cCMP, and cUMP serve as partial agonists for the HCN2 and HCN4 isoforms. By competing with cAMP for binding, these non-canonical ligands alter ion channel gating, and in turn, modulate the cAMP-dependent activation profiles...
February 9, 2017: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/28178813/effect-of-the-nature-of-the-substrate-on-the-surface-chemistry-of-atomic-layer-deposition-precursors
#19
Yunxi Yao, Jason P Coyle, Seán T Barry, Francisco Zaera
The thermal chemistry of Cu(I)-sec-butyl-2-iminopyrrolidinate, a promising copper amidinate complex for atomic layer deposition (ALD) applications, was explored comparatively on several surfaces by using a combination of surface-sensitive techniques, specifically temperature-programmed desorption and x-ray photoelectron spectroscopy (XPS). The substrates explored include single crystals of transition metals (Ni(110) and Cu(110)), thin oxide films (NiO/Ni(110) and SiO2/Ta), and oxygen-treated metals (O/Cu(110))...
February 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28177679/reduced-expression-of-hcn-channels-in-sinoatrial-node-of-streptozotocin-induced-diabetic-rats
#20
Xin Huang, Nier Zhong, Hong Zhang, Aiqun Ma, Zuyi Yuan, Ning Guo
Diabetes mellitus (DM) is associated with an electrical remodeling of the heart, increasing risk of arrhythmias. However, knowledge of electrical remodeling in sinoatrial node (SAN) by DM is limited. We investigated the expression of HCN channel isoforms, HCN1-HCN4, in SAN from streptozotocin (STZ)-induced diabetic rats and the age-matched controls. We found that the STZ-induced diabetic rats have a lower intrinsic heart rate, a lengthened sinoatrial conduction time and rate-corrected maximal sinoatrial node recovery time in vivo as well as a longer cycle length (CL) in vitro as compared with the control...
December 23, 2016: Canadian Journal of Physiology and Pharmacology
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