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https://www.readbyqxmd.com/read/29323484/quaternary-layered-semiconductor-ba2cr4gese10-synthesis-crystal-structure-and-thermoelectric-properties
#1
Hong Chen, Yu-Kun Chen, Hua Lin, Jin-Ni Shen, Li-Ming Wu, Xin-Tao Wu
A quaternary narrow-band-gap semiconductor, Ba2Cr4GeSe10, has been discovered by solid-state reaction. It features a new structure type and crystallizes in the triclinic space group P1̅ (No. 2). The featured 2D anionic layers are constructed by condensed CrSe6 octahedra that are stacking along the c axis, with dispersed GeSe4 tetrahedra and located Ba2+ cations forming these layers. The energy-band structure shows a clear separation between the region of electronic conduction and the zone of electronic insulation...
January 11, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29201628/aluminum-doped-cesium-lead-bromide-perovskite-nanocrystals-with-stable-blue-photoluminescence-used-for-display-backlight
#2
Ming Liu, Guohua Zhong, Yongming Yin, Jingsheng Miao, Ke Li, Chengqun Wang, Xiuru Xu, Clifton Shen, Hong Meng
Bright and stable blue emitters with narrow full-width at half-maxima are particularly desirable for applications in television displays and related technologies. Here, this study shows that doping aluminum (Al3+) ion into CsPbBr3 nanocrystals (NCs) using AlBr3 can afford lead-halide perovskites NCs with stable blue photoluminescence. First, theoretical and experimental analyses reveal that the extended band gap and quantum confinement effect of elongated shape give rise to the desirable blueshifted emission...
November 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29180531/anion-gap-as-a-determinant-of-ionized-fraction-of-divalent-cations-in-hemodialysis-patients
#3
Yusuke Sakaguchi, Takayuki Hamano, Keiichi Kubota, Tatsufumi Oka, Satoshi Yamaguchi, Ayumi Matsumoto, Nobuhiro Hashimoto, Daisuke Mori, Yasue Obi, Isao Matsui, Yoshitaka Isaka
BACKGROUND AND OBJECTIVES: Circulating levels of anions that bind to magnesium and calcium are often altered in patients with CKD. However, it is unknown how these alterations affect the ionized fraction of magnesium and calcium. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: This cross-sectional study involved patients on maintenance hemodialysis and patients not on dialysis who visited the outpatient department of nephrology. We collected whole-blood samples to measure ionized magnesium and calcium concentrations...
November 27, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29178965/a-child-with-distal-type-1-renal-tubular-acidosis-presenting-with-progressive-gross-motor-developmental-regression-and-acute-paralysis
#4
Randula Ranawaka, Kavinda Dayasiri, Manoji Gamage
BACKGROUND: Distal (Type 1) renal tubular acidosis (dRTA) is characterized by inability to secrete hydrogen irons from the distal tubule. The aetiology of dRTA is diverse and can be either inherited or acquired. Common clinical presentations of dRTA in the paediatric age group include polyuria, nocturia, failure to thrive, constipation, abnormal breathing and nephrolithiasis. Though persistent hypokalemia is frequently seen in dRTA, hypokalemic muscular paralysis is uncommon and rarely described in children...
November 25, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29165466/the-lone-pair-electron-driven-phase-transition-and-order-disorder-processes-in-thermochromic-2-mim-sbi4-organic-inorganic-hybrid
#5
A Gągor, G Banach, M Węcławik, A Piecha-Bisiorek, R Jakubas
The easy to prepare and stable in air (2-methylimidazolium) tetraiodoantimoniate(iii) single-crystals with optical band gap of 2.17(1) eV at room temperature have been synthesized. The crystal structure features one-dimensional [SbI4](-)n anionic chains, which are intercepted with stacks of 2MIm(+) ions. At 294/295 K, it undergoes a structural phase transition to an incommensurately modulated phase as a result of subtle, lone-pair-electron-driven distortions of the anions. Separately from the anion displacements, the ordering of 2MIm(+) countercations takes place over a wide temperature range of the modulated phase...
November 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29111277/resolution-of-ketoacidosis-in-children-with-new-onset-diabetes-evaluation-of-various-definitions
#6
Julia E von Oettingen, Erinn T Rhodes, Joseph I Wolfsdorf
AIMS: Data are sparse concerning use of serum electrolyte parameters as compared to venous blood gas (VBG) measurements to monitor acid-base status during treatment of diabetic ketoacidosis (DKA). We explored the utility of various parameters to define DKA resolution by investigating the relationship of venous pH (vpH), anion gap (AG), serum bicarbonate (HCO3), and glucose concentration during management of DKA in children with new onset diabetes mellitus (NODM). METHODS: We included all patients with NODM presenting with DKA to Boston Children's Hospital from 10/1/07-7/1/13...
October 27, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/29100545/a-systematic-review-and-diagnostic-test-accuracy-meta-analysis-of-the-validity-of-anion-gap-as-a-screening-tool-for-hyperlactatemia
#7
Stella Andrea Glasmacher, William Stones
OBJECTIVE: This systematic review and meta-analysis seeks to determine the validity of the anion gap to screen for hyperlactatemia in critically ill patients. We have previously shown that the anion gap does not predict 31-day and in-hospital mortality in critically ill patients. The present review aims to add confirmatory evidence to identify whether the anion gap is a suitable tool for risk stratification in low-resource countries. RESULTS: Nine studies reporting on 4504 samples from 2111 patients were included...
November 3, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29097482/urine-anion-gap-to-predict-urine-ammonium-and-related-outcomes-in-kidney-disease
#8
Kalani L Raphael, Sarah Gilligan, Joachim H Ix
BACKGROUND AND OBJECTIVES: Low urine ammonium excretion is associated with ESRD in CKD. Few laboratories measure urine ammonium, limiting clinical application. We determined correlations between urine ammonium, the standard urine anion gap, and a modified urine anion gap that includes sulfate and phosphate and compared risks of ESRD or death between these ammonium estimates and directly measured ammonium. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We measured ammonium, sodium, potassium, chloride, phosphate, and sulfate from baseline 24-hour urine collections in 1044 African-American Study of Kidney Disease and Hypertension participants...
November 2, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29091411/in-situ-ligand-modification-strategy-for-the-construction-of-one-two-and-three-dimensional-heterometallic-iodides
#9
Ai-Huan Sun, Jie Pan, Song-De Han, Xu-Yan Xue, Qi Wei, Jin-Hua Li, Guo-Ming Wang
Three heterometallic iodides featuring the novel in situ modified ligands N,N',N″-trimethyl-2,4,6-tris(4-pyridyl)-1,3,5-triazine (Me3tpt(3+)), N,N'-dimethyl-2,4,6-tris(4-pyridyl)-1,3,5-triazine (Me2tpt(2+)), and N-monomethyl-2,4,6-tris(4-pyridyl)-1,3,5-triazine (Metpt(+)), [Pb3CuI10(Me3tpt)] (1), [Pb5Cu2I16(Me2tpt)2] (2), and [Pb3Cu6I14(Metpt)2] (3), were synthesized. Compound 1 exhibits a chain structure, in which the Pb4I16 units are connected by the CuI3 units. The negative charge of the resulting chain is balanced by the cationic Me3tpt(3+) groups...
November 1, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29062185/a-case-of-renal-tubular-acidosis-with-sjogren-s-syndrome-showing-paradoxical-block-of-pth-due-to-severe-hypomagnesemia
#10
B Vinodh Kumar, M Sivalingam, G Shiva Kumaran, Balambal Balakrishnan
Distal renal tubular acidosis (RTA) manifests either as Complete/Classical form or Incomplete/Latent Form. Distal RTA causes normal anion gap metabolic acidosis and hypokalemia. Interstitial Nephritis is the most frequent renal manifestation of Sjogren's, which presents as Distal RTA in 25-40% of patients with Sjogren's syndrome. Magnesium deficiency is frequently associated with hypokalemia. Although serum calcium is the main physiological control for the secretion of parathyroid hormone (PTH) by the parathyroid, serum magnesium can also exert similar effects...
October 2017: Indian Journal of Clinical Biochemistry: IJCB
https://www.readbyqxmd.com/read/29037045/bi4o4cu1-7se2-7cl0-3-intergrowth-of-biocuse-and-bi2o2se-stabilized-by-the-addition-of-a-third-anion
#11
Quinn D Gibson, Matthew S Dyer, George F S Whitehead, Jonathan Alaria, Michael J Pitcher, Holly J Edwards, John B Claridge, Marco Zanella, Karl Dawson, Troy D Manning, Vin R Dhanak, Matthew J Rosseinsky
Layered two-anion compounds are of interest for their diverse electronic properties. The modular nature of their layered structures offers opportunities for the construction of complex stackings used to introduce or tune functionality, but the accessible layer combinations are limited by the crystal chemistries of the available anions. We present a layered three-anion material, Bi4O4Cu1.7Se2.7Cl0.3, which adopts a new structure type composed of alternately stacked BiOCuSe and Bi2O2Se-like units. This structure is accessed by inclusion of three chemically distinct anions, which are accommodated by aliovalently substituted Bi2O2Se0...
October 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29018645/dietary-therapy-for-von-gierke-s-disease-a-case-report
#12
Mohammad Raza, Fehmina Arif, Pirthvi Raj Giyanwani, Saad Azizullah, Sonum Kumari
Von Gierke's disease, also known as glycogen storage disease (GSD) type 1A, is an autosomal recessive disease in which there is an inability to cleave glycogen to glucose because of a glucose 6 phosphate deficiency resulting in hypoglycemia and lactic acidosis. The patient may present with hepatomegaly and signs and symptoms of hypoglycemia. We diagnosed a case of Von Gierke's disease in a seven-month-old female infant who was admitted for abdominal distension, vomiting, and lethargy for a duration of four months with characteristic rounded doll's face, fatty cheeks, protuberant abdomen, and massive hepatomegaly...
August 8, 2017: Curēus
https://www.readbyqxmd.com/read/28953385/octa-kagom%C3%A3-lattice-compounds-showing-quantum-critical-behaviors-spin-gap-ground-state-versus-antiferromagnetic-ordering
#13
Yingying Tang, Cheng Peng, Wenbin Guo, Jun-Feng Wang, Gang Su, Zhangzhen He
Search for a new geometrically frustrated lattice is a great challenge. Herein, we report on a successful synthesis of two new layered compounds BiOCu2(XO3)(SO4)(OH)·H2O [X = Te (1) and Se (2)] with a new type of geometrically frustrated lattice (i.e., the octa-kagomé lattice) between kagomé and star motifs. Magnetic measurements confirmed that 1 exhibits a spin gap ground state, while 2 possesses a typical antiferromagnetic ordering at low-temperature. Such different magnetic behaviors between two isostructural compounds are suggested to originate from a slightly structural modification induced by nonmagnetic XO3 anionic groups...
October 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28952727/cyanido-bridged-ln-iii-w-v-heterobinuclear-complexes-synthesis-and-magneto-structural-study
#14
Maria-Gabriela Alexandru, Diana Visinescu, Sergiu Shova, Francesc Lloret, Miguel Julve
A new series of cyanido-bridged {Ln(III)W(V)} heterobinuclear complexes of formula [Ln(III)(pyim)2(i-PrOH)(H2O)2(μ-CN)W(V)(CN)7]·2H2O [Ln = Gd (1), Tb (2), Dy (3), Ho (4), and Er (5); pyim = 2-(1H-imidazol-2-yl)-pyridine) and i-PrOH = isopropyl alcohol] were synthesized by one-pot reaction between (NH3Bu)3[W(CN)8] and [Ln(pyim)2](2+) complexes (generated in situ by mixing the corresponding Ln(III) ions and the pyim ligand). Compounds 1-5 are isomorphous and crystallize in the monoclinic system P21/n space group...
September 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28926691/cobalt-porphyrin-thiazyl-radical-coordination-polymers-toward-metal-organic-electronics
#15
Delia A Haynes, Laura J van Laeren, Orde Q Munro
Herein we delineate an unusual one-dimensional coordination polymer (CP), 3, prepared from S = 1/2 Co(TPP), 1 (TPP = 5,10,15,20-tetraphenylporphyrin dianion), and S = 1/2 4-(4'-pyridyl)-1,2,3,5-dithiadiazolyl (py-DTDA) radical, 2. The atypically long S-S distance for CP 3 (2.12 Å) reflects fractional electron transfer from the formally Co(II) ion into the antibonding π-SOMO of the metal-bound py-DTDA bridging ligand. The bonding in solid CP 3 involves noninteger redox states in a resonance hybrid repeat unit best formulated as [Co(TPP)](0...
October 4, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28924478/a-rare-cause-of-metabolic-acidosis-ketoacidosis-in-a-non-diabetic-lactating-woman
#16
Gordon Sloan, Amjad Ali, Jonathan Webster
Ketoacidosis occurring during lactation has been described infrequently. The condition is incompletely understood, but it appears to be associated with a combination of increased metabolic demands during lactation, reduction in carbohydrate intake and acute illness. We present a case of a 27-year-old woman, 8 weeks post-partum, who was exclusively breastfeeding her child whilst following a low carbohydrate diet. She developed gastroenteritis and was unable to tolerate an oral diet for several days. She presented with severe metabolic acidosis on admission with a blood 3-hydroxybutyrate of 5...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28914421/acid-base-safety-during-the-course-of-a-very-low-calorie-ketogenic-diet
#17
Diego Gomez-Arbelaez, Ana B Crujeiras, Ana I Castro, Albert Goday, Antonio Mas-Lorenzo, Ana Bellon, Cristina Tejera, Diego Bellido, Cristobal Galban, Ignacio Sajoux, Patricio Lopez-Jaramillo, Felipe F Casanueva
BACKGROUND AND AIMS: Very low-calorie ketogenic (VLCK) diets have been consistently shown to be an effective obesity treatment, but the current evidence for its acid-base safety is limited. The aim of the current work was to evaluate the acid-base status of obese patients during the course of a VLCK diet. METHOD: Twenty obese participants undertook a VLCK diet for 4 months. Anthropometric and biochemical parameters, and venous blood gases were obtained on four subsequent visits: visit C-1 (baseline); visit C-2, (1-2 months); maximum ketosis; visit C-3 (2-3 months), ketosis declining; and visit C-4 at 4 months, no ketosis...
October 2017: Endocrine
https://www.readbyqxmd.com/read/28883241/ketoacidosis-due-to-a-low-carbohydrate-diet-in-an-elderly-woman-with-dementia-and-abnormal-eating-behavior
#18
Hitoshi Iwata, Seiichiro Tsuzuki, Mitsunaga Iwata, Teruhiko Terasawa
Strict restriction of carbohydrates can induce symptomatic ketoacidosis. We herein report a 76-year-old demented woman who developed ketoacidosis after 1 month of abnormal eating behavior involving selectively eating hamburger steak (estimated carbohydrate =12.7 g/day). Laboratory tests showed high-anion-gap metabolic acidosis with elevated blood ketone levels. She was successfully treated with intravenous fluids followed by oral intake of a regular diet. She remained relapse-free after correcting her eating habits...
October 1, 2017: Internal Medicine
https://www.readbyqxmd.com/read/28865122/investigation-of-challenging-spin-systems-using-monte-carlo-configuration-interaction-and-the-density-matrix-renormalization-group
#19
Jeremy P Coe, Nuno M S Almeida, Martin J Paterson
We investigate if a range of challenging spin systems can be described sufficiently well using Monte Carlo configuration interaction (MCCI) and the density matrix renormalization group (DMRG) in a way that heads toward a more "black box" approach. Experimental results and other computational methods are used for comparison. The gap between the lowest doublet and quartet state of methylidyne (CH) is first considered. We then look at a range of first-row transition metal monocarbonyls: MCO when M is titanium, vanadium, chromium, or manganese...
September 2, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28840651/two-series-of-homodinuclear-lanthanide-complexes-greatly-enhancing-energy-barriers-through-tuning-terminal-solvent-ligands-in-dy2-single-molecule-magnets
#20
Yaru Qin, Haifeng Zhang, Hao Sun, Yangdan Pan, Yu Ge, Yahong Li, Yi-Quan Zhang
The utilization of 2-ethoxy-6-{[(2-hydroxy-3-methoxybenzyl)imino]methyl}phenol (H2 L) as a chelating ligand, in combination with the employment of alcohols (EtOH and MeOH) as auxiliary ligands, in 4 f-metal chemistry afforded two series of dinuclear lanthanide complexes of compositions [Ln2 L2 (NO3 )2 (EtOH)2 ] (Ln=Sm (1), Eu (2), Gd (3), Tb (4), Dy (5), Ho (6), Er (7)) and [Ln2 L2 (NO3 )2 (MeOH)2 ] (Ln=Sm (8), Eu (9), Gd (10), Tb (11), Dy (12), Ho (13), Er (14)). The structures of 1-14 were determined by single-crystal X-ray crystallography...
August 24, 2017: Chemistry, An Asian Journal
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