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Total Synthesis and Structure-Activity Studies of Geodiamolide H

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Synfacts 2021年第9期17卷 1054-1054页

作者： Dirk Trauner Bruno Matos Paz

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Expansion potential of novel skin grafts simulants with I-shaped auxetic incisions

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Biomedical Engineering Advances 2023年 5卷

作者： Vivek Gupta Arnab Chanda Centre for Biomedical Engineering Indian Institute of Technology (IIT) Delhi India Department of Biomedical Engineering All India Institute of Medical Sciences (AIIMS) Delhi India

Skin grafts play an important role in treatment of severe burn injuries. Split-thickness skin grafting is one of the most common grafting technique, in which, parallel incision patterns are projected onto a small portion of excised skin for generating expansions and covering a larger burn site. However, to date, expansions reported through experiments on such grafts, have been much lower than claimed, which inhibits their application in severe burn injury mitigation. In this work, novel skin graft simulants were developed to study the expansion potential of skin grafts with I-shaped auxetic incision patterns. A range of I-shape dimensional parameters were tested, and the effective Poisson's effect, meshing ratios, and generated stresses, biaxial deformation and stress were estimated across all skin graft simulants, with strain loadings up to 200%. High spacing between I-shaped unit cells, was found to generate high negative Poisson's ratio and meshing ratio (MR). With high spacing, lowest stresses were generated for the maximum edge lengths of the I-shape. Maximum negative Poisson's ratio of -1.12 and meshing ratio of 3.84 were produced by the skin graft simulants, indicating expansions much higher than traditional skin grafts. Such results have not been realized with skin grafts to date, which would be indispensable for further research into skin graft expansions and treatment of severe burn injuries.

关键词： Burns Skin graft Expansion Meshing ratio Auxetics A Cross-section Area f force kPa kilopascal L Length mm millimeter MR Meshing Ratio NPR Negative Poisson's Ratio PLA Polylactic Acid STL Stereolithography STSG Split Thickness Skin Grafting UTS Ultimate Tensile Strength UTM Universal Testing Machine 3 D Three Dimensional σ stress ε strain

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Sinopec Group:Expanding Its Ethylene Business

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China Chemical Reporter 2007年第12期18卷 10-10页

Since its establishment in 1998,SinopecGroup,China’s largest integrated en-ergy chemical enterprise,has beensticking to the principle of ’developingthe petrochemical industry and build-ing core businesses’ and actively pro-moted the development of its ethylenebusiness under the favorable conditionsof opportunities and industrial *** particular in recent years,the grouphelped China to be the second

关键词： Ethylene petrochemical thousand favorable profit f

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IMPROVED OHMIC CONTACTS TO N-TYPE GAP DEVICES

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SOLID-STATE ELECTRONICS 1971年第9期14卷 849-+页

作者： NAKATSUKA, H DOMENICO, AJ PEARSON, GL Stanford Electronics Laboratories Stanford University Stanford California 94305 U.S.A.

Ohnic contacts to n -type GaP devices which are capable of operation at ambient temperatures as high as 500°C were investigated. Alloying temperatures of Au, Al, Ag and Ni films on GaP single crystals were measured and found to be 520, 635, 690 and 760°C respectively, within an accuracy of ± 20°C. films of Ag covered with Ni showed good wetting on GaP and were stable well above 500°C. Silver based alloy contacts such as Ag-Ge, Ag-Te and Ag-Te-Sb covered with Ni films were ohmic after heat treatments at temperatures between 600 and 700°C. The lowest specific contact resistance obtained to date is 4 × 10 −4 Ω cm 2 with the Ag-Te-Sb system. On mesure ici les contacts ohmiques avec des appareils Gap pouvant fonctionner à des températures ambiantes atteignant 500°C. On a mesuré les températures alliantes de pellicules d’Au, d’At, d’Ag et de Ni sur des cristaux simples Gap et on a constaté qu’elles étaient respectivement de 520, 635, 690 et 760°C avec une marge de ±20°C. Les pellicules d’Ag recouvertes de Ni ont montré une bonne faculté d’humidification sur GaP et sont demeurées stables jusqu’à plus de 500°C. Les contacts en alliage à base d’Ag tels que Ag-Ge, Ag-Te et Ag-Te-Sb recouverts d’une pellicule de Ni devinrent ohmiques après traitement thermique à des températures situées entre 600 et 700°C. La plus faible résistance spécifique de contact obtenue jusqu’à présent est de l’ordre de 4 × 10 −4 Ω cm 2 au moyen du système Ag-Te-Sb. Ohmsche Kontakte füt n -Type GaP, die einen Betrieb bei Umgebungstemperaturen bis zu 500°C erlauben, wurden untersucht. Die Einlegierungstemperaturen für filme aus Au, Al, Ag und Ni auf GaP wurden mit einer Genauigkeit von ± 20°C zu 520, 635, 690 bzw. 760°C bestimmt Silberfilme mit einer Nickeldeckschicht zeigten eine gute Benetzung auf GaP und waren noch oberhalb 500°C stabil. Kontakte auf Silberbasis, wie Ag-Ge, Ag-Te und Ag-Te-Sb mit einer Nickelschicht zeigten nach einer Wärmebehandlung zwischen 600 und 700°C eine ohmsche Charakteristik

关键词： R T total resistance of the sample in Ω ρ resistivity in Ω cm d contact diameter in cm. a thickness of the sample in cm R c speific contact resistance in Ω cm 2 R e residual resistance in Ω w depletion layer width of Schottky barrier in cm D diffusion constant in cm 2 /sec t diffusion constant in cm 2 /sec t diffusion time in sec. x distance from the contact interface in cm N ( x ) impurity concentration in cm −3 N g surface concentration in cm −3 N B background concentration in cm −3 ξ o w/(2√Dt). κ dielectric constant. ε e permittivity of free space in f /cm V D diffusion potential of Schotty barrier in V q electronic charge in C ψ electrostatic potential in V

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The Great American Novel as Pop-up Book: Baz Luhrmanns The Great Gatsby

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ADAPTATION-THE JOURNAL Of LITERATURE ON SCREEN STUDIES 2013年第3期6卷 397-+页

作者： Polan, Dana NYU New York NY 10003 USA

A review of Baz Luhrmanns 3-D adaptation of f. Scott fitzgeralds The Great Gatsby that emphasizes how the 3-D technology renders scenes from the novel as so many flattened tableaux that both empty the story of substan... 详细信息

关键词： The Great Gatsby Baz Luhrmann 3-D f Scott fitzgerald

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What Does the Snowstorm Mean?

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China Chemical Reporter 2008年第6期19卷 4-4页

作者： Zhong Weike

Beginning January 12th,southern China,a region close to the equator that typically has a warm winter with a temperature higher than 15 degrees centigrade,suffered a 15-day *** seven mil-lion people experienced *** to ... 详细信息

关键词： suffered temperate experienced winter difficulty f

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Single double-lumen venous-venous pump-driven extracorporeal lung membrane support

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JOURNAL Of THORACIC AND CARDIOVASCULAR SURGERY 2010年第3期140卷 558-U105页

作者： Sanchez-Lorente, David Go, Tetsuhiko Jungebluth, Philipp Rovira, Irene Mata, Maite Carme Ayats, Maria Macchiarini, Paolo Univ Barcelona Hosp Clin Thorac Surg Expt Lab Barcelona Spain Univ Barcelona Hosp Clin Dept Aneshesiol Barcelona Spain IDIBAPS Barcelona Spain Fundacio Clin Barcelona Spain

Objective: We sought to investigate the safety and feasibility of obtaining total respiratory support during 72 hours using a pump-driven (Levitronix CentriMag;Levitronix LLC, Waltham, Mass) venous-venous extracorporeal lung membrane (Novalung;Novalung GmbH, Hechingen, Germany) attached through a single double-lumen cannula (Novalung) into the femoral or jugular vein in pigs. Methods: Twelve pigs were initially mechanically ventilated for 2 hours (respiratory rate, 20-25 breaths/min;tidal volume, 10-12 mL/kg;fraction of inspired oxygen, 1.0;positive end-expiratory pressure, 5 cm H2O). Thereafter, the extracorporeal lung membrane was attached to the right femoral (n = 6, 26f) or jugular (n = 6, 22f) vein by using a single double-lumen cannula placed transcutaneously. Ventilatory settings were then reduced to near-apneic ventilation (respiratory rate, 4 breaths/min;tidal volume, 1-2 mL/kg;fraction of inspired oxygen, 0.21;positive end-expiratory pressure, 10 cm H2O), and pump flow was increased hourly until maximal efficacy. Blood gases and hemodynamics were measured hourly, and lung and plasma cytokine levels were measured every 4 hours. Results: The device's mean blood flow was 2.16 +/- 0.43 L/min, permitting an oxygen transfer and carbon dioxide removal of 203.6 +/- 54.6 and 590.3 +/- 23.3 mL/min, respectively. Despite static ventilation, all pigs showed optimal respiratory support, with a PaO2, PaCO2, and mixed venous oxygen saturation of 226.2 +/- 56.4, 59.7 +/- 8.8, and 85.6 +/- 5.3 mm Hg, respectively. There were no significant inflammatory, cellular, or coagulatory responses;lung cytokine levels remained in the normal range. Route (femoral vs jugular) or size (22f vs 26f) of the cannula did not change hemodynamic or respiratory parameters significantly. Conclusions: This circuit provides total respiratory support over 72 hours without inducing significant hemodynamic, coagulatory, cellular, or inflammatory responses. (J Thorac Cardiovasc Surg 2010;140: 558-63)

关键词： 11.4 25 ACT activated clotting time BAL bronchoalveolar lavage Ca o 2 oxygen content ECMO extracorporeal membrane oxygenation f io 2 fraction of inspired oxygen IL interleukin PEEP positive end-expiratory pressure PIP peak inspiratory pressure RR respiratory rate V T tidal volume

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Stille Begleiter

Deutsche Heilpraktiker-Zeitschrift

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Deutsche Heilpraktiker-Zeitschrift 2019年第6期14卷 44-48页

作者： Stefanie Gundacker

Überhöhte Konzentrationen gelöster Substanzen oder Abflusshindernisse führen im Körper zur Steinbildung, am häufigsten in form von Gallen- und Nierensteinen. Steine können über längere Zeit symptomlos bleiben, führen jedoch zu plötzlichen und heftigen Beschwerden, wenn sie Ausführgänge oder andere flüssigkeitsführende Gefäße verlegen. Im akuten fall müssen die Ursachen ärztlich abgeklärt und die Steine eventuell chirurgisch entfernt werden, ansonsten stehen naturheilkundliche Therapien wie entkrampfende oder durchspülende Tees zur Verfügung.

关键词： Steinbildung Gallenstein Nierenstein Schmerz Cholezystektomie Cholesterin Bilirubin Gallengrieß Vatersche Papille Gallenblase Cholezystitis Pankreatitis 6 f Regel Cholesterinpumpe Krampflösung Durchspülung Harnleiter Nierengrieß Harn Trinken Harnwege Litholyse Nephrolith Kotstein Mandelstein Tonsillenstein Speichelstein

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黄山药化学成分代谢及其诱导细胞凋亡的分子机制的研究

黄山药化学成分代谢及其诱导细胞凋亡的分子机制的研究

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作者：董梅沈阳药科大学

学位级别：博士

黄山药（Dioscorea panthaica Prain et Burkill）为薯蓣科（Dioscoreaceae）薯蓣属（Dioscorea）植物，是我国特有的植物。其药用部位为根茎，具有祛风除湿、清热解毒的功效，民间用以治疗胃病、跌打痨伤、牛马炭疽病。本文主要进... 详细信息

黄山药（Dioscorea panthaica Prain et Burkill）为薯蓣科（Dioscoreaceae）薯蓣属（Dioscorea）植物，是我国特有的植物。其药用部位为根茎，具有祛风除湿、清热解毒的功效，民间用以治疗胃病、跌打痨伤、牛马炭疽病。本文主要进行了化学成分、天然产物代谢和细胞凋亡的分子机制三方面的研究。本文利用大孔吸附树脂柱色谱，硅胶柱色谱，葡聚糖凝胶柱色谱、高效液相色谱等分离手段，从植物黄山药中分离出28种化合物，利用理化性质和光谱学技术，鉴定了其中的22种；其中，9个为新化合物，它们皆具有新的甾体骨架或新的苷元结构； 3个化合物为首次从该属植物中分离得到。利用肠内菌代谢的方法，研究了dioscin（8）和pseudoprotodioscin（11）的代谢，共分离得到11种代谢产物，鉴定了其中的7种；其中，2个为新化合物。从黄山药根茎中分离得到的9个新化合物分别命名为：黄山药皂苷A（26-O-β-D- glucopyranosyl-3β，26-diol-20，22-seco-25(R)-furosta-5-en-20，22-dione-3-O-α-L- rhamnopyranosyl-（1→2）-［β-D-glucopyranosyl-（1→3）］-β-D-glucopyranoside， dioscoreside A）（12），黄山药皂苷B（26-O-β-D-glucopyranosyl-3β，23α，26-triol-20， 22-seco-25(R)-furosta-5-en-20，22-dione-3-O-α-L-rhamnopyranosyl-（1→2）-［α-L- rhamnopyranosyl-（1→4）］-β-D-glucopyranoside，dioscoreside B）（13），黄山药皂苷C （26-O-β-D-glucopyranosyl-3β，26-diol-23（α）-methoxyl-25(R)-furosta-5，20(22)-diene- 3-O-α-L-rhamnopyranosyl-（1→2）-［α-L-rhamnopyranosyl-（1→4）］-β-D- glucopyranoside，dioscoreside C）（14），黄山药皂苷D（26-O-β-D-glucopyranosyl-3β， 26-diol-20，22-seco-25(R)-furosta-5-en-20，22-dione-3-O-α-L-rhamnopyranosyl-（1→2） -［α-L-rhamnopyranosyl-（1→4）］-β-D-glucopyranoside，dioscoreside D）（15），黄山药皂苷E（26-O-β-D-glucopyranosyl-3β，26-diol-20，22-seco-25(R)-furosta-5，22（23）-dien- 20(R)-methoxyl-3-O-α-L-rhamnopyranosyl-（1→2）-［α-L-rhamnopyranosyl-（1→4）］- β-D-glucopyranoside，dioscoreside E）（16），黄山药皂苷f（26-O-β-D-glucopyranosyl-3 β，20（S），22，23（α），26-pentaol-25（R）-furosta-5-en-3-O-α-L-rhamnopyranosyl-（1→2） -［α-L-rhamnopyranosyl-（1→4）］-β-D-glucopyranoside，dioscoreside f）（17），黄山药皂苷G（26-O-β-D-glucopyranosyl-3β，17α，22，26-tetraol-20，22-seco-25(R)-furosta-5- 沈冈茵科大学俗士学位论文茵耍

关键词：黄山药(Dioscorea panthaica Prain et Burkill) 甾体皂苷黄山药皂苷A B C D E f G H I 肠内菌代谢体内代谢抗肿瘤活性细胞凋亡信号转导机制

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Removal of hexavalent chromium Cr (VI) using activated carbon prepared from mango kernel activated with H 3 PO 4

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Resource-Efficient Technologies 2016年 2卷 S63-S70页

作者： M.K. Rai G. Shahi V. Meena R. Meena S. Chakraborty R.S. Singh B.N. Rai Department of Chemical Engineering and Technology IIT (BHU) Varanasi 221005 India

The present work reported the adsorption of Cr (VI) from aqueous solutions on activated carbon prepared from mango kernel, a seasonal waste from mango fruits. Kernels from dried mango fruit shells were taken out and pulverized in a micro-pulverizing mill. The powder thus obtained was activated with 40% H 3 PO4 and carbonized at 600 °C for 1 hour in an inert atmosphere. Physico-chemical characteristics such as elemental composition, surface area, functional groups and surface morphology of the activated carbon were analyzed using elemental analyzer, BET surface area analyzer, fTIR spectroscopy and SEM analysis respectively. Batch adsorption experiments were performed to investigate the effects of Cr (VI) concentration, carbon dose, pH, rate of agitation, time and temperature. The maximum adsorption capacity of Cr(VI) was found to be 7.8 mg g −1 at pH 2 and temperature 35 °C. The Langmuir adsorption isotherm best represented the equilibrium data and a pseudo-second order relation represented the adsorption kinetics.

关键词： Removal Activated carbon Hexavalent chromium Cr (VI) Mango kernel b Langmuir isotherm constant (L mg −1 ) C e equilibrium concentration of Cr (VI) (mg L −1 ) C t concentration of Cr (VI) at any time t (mg L −1 ) C 0 initial concentration of Cr (VI) (mg L −1 ) K 1 rate constant of pseudo-first order sorption (min −1 ) K 2 rate constant of the pseudo-second order sorption (g ⋅ mg −1 ⋅ min −1 ) K f freundlich isotherm constants (mg ⋅ g −1 (L ⋅ mg −1 ) 1/ n ) n adsorption intensity q e sorption capacities at equilibrium (mg g −1 ) q m quantity of adsorbate required a single adsorption layer on unit mass of adsorbent (mg g −1 ) q t sorption capacities at any time t (mg g −1 ) R L separation factor t time (min) V volume of Cr(VI) (L) W weight of activated carbon( g)

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