bluuebunny/crossref_metadata_2025 huggingface dataset:
ChemInform Abstract: One‐Pot, Simple, and Convenient Synthesis of 2‐Thioxo‐2,3‐dihydroquinazolin‐4(1H)‐ones.
Authors: Tiwari Vinod K. , Singh Desh D. , Hussain Hakkim A. , Mishra Bhuwan B. , Singh Archana
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis and Antimicrobial Activity of New Isoxazolyl‐1,3‐benzoxazines.
Authors: Rajanarendar E. , Mohan G. , Reddy A. Siva Rami
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: A Novel Approach to Fused 1,2,4‐Triazines (II) by Intramolecular Cyclization of 1,2‐Diaza‐1,3‐butadienes Bearing Allyl(propargyl)sulfanyl and Cyclic tert‐Amino Groups.
Authors: Belskaia Natalia P. , Deryabina Tatyana G. , Koksharov Alexandr V. , Kodess Mikhail I. , Dehaen Wim , Lebedev Albert T. , Bakulev Vasiliy A.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: 2‐Nitroguanidine Derivatives. Part 10. Synthesis and Nitration of 4‐Nitriminotetrahydro‐1,3,5‐oxadiazine (IIIa) and 2‐Nitriminohexahydro‐1,3,5‐triazine (VII) and Their Substituted Derivatives.
Authors: Metelkina E. L.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Au(I)‐Catalyzed Efficient Synthesis of α‐Acyloxy‐α′‐silyl Ketones from α‐Acyloxy‐α‐alkynylsilanes.
Authors: Sakaguchi Kazuhiko , Okada Takuya , Shinada Tetsuro , Ohfune Yasufumi
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Novel Macroheterocycles Containing Phosphorus and Nitrogen.
Authors: Babu Boppudi Hari , Srinivasulu Kambam , Prasad Gandavaram Syam , Raju Chamarthi Naga
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: An Approach to Asymmetric Synthesis of New Pyridine Aminophosphine Oxides. Preparation of the Diastereomerically Pure 1‐(Pyridine‐3‐yl)‐1‐ [N‐(α‐methylbenzylamino)]methyl‐diphenylphosphine Oxides and 1‐(Pyridine‐3‐yl)‐1‐ [N‐(α‐methylbenzylamino)]methyl‐t‐butyl‐phenylphosphine Oxides.
Authors: Guzik M. , Olszewski T. K. , Boduszek B.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: A Mild and Convenient Oxidation of H‐Phosphinic Acids.
Authors: Berlicki L. , Mucha A. , Kafarski P.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Nucleophilic Substitution of Ferrocenyl Alcohols “on Water”.
Authors: Cozzi Pier Giorgio , Zoli Luca
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Substituted 5‐Antipyrinylazo‐4‐phenyl‐2‐aminothiazoles as Disperse Dyes for Dyeing Polyester Fabrics.
Authors: Metwally Mohamed A. , Metwally Amira , Abdel‐Galil Ebrahim , Amer Fathy A.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Bisbakuchiols A and B, Novel Dimeric Meroterpenoids from Psoralea corylifolia.
Authors: Wu Cheng‐Zhu , Cai Xing Fu , Nguyen Tien Dat , Hong Seong Su , Han Ah‐Reum , Seo Eun‐Kyoung , Hwang Bang Yeon , Nan Ji‐Xing , Lee Dongho , Lee Jung Joon
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Sculponins A—C, Three New 6,7‐seco‐ent‐Kauranoids from Isodon sculponeatus
Authors: Sun Han‐Dong , et al. et al.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Enantiospecific Synthesis of the Complete Carbon Framework of the Diterpenes Komarovispiranes.
Authors: Srikrishna A. , Beeraiah B.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Sesquiterpenoids from Chloranthus spicatus (Thunb.) Makino
Authors: Yang Sheng‐Ping , Zhang Chuan‐Rui , Chen Hua‐Dong , Liao Shang‐Gao , Yue Jian‐Min
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Substituted Steroidal Thiadiazole, Triazole and Oxidotriazole.
Authors: Shamsuzzaman Shamsuzzaman , Siddiqui Tabassum , Alam Mohd. Gulfam
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Substituted 2‐Phenylhistamines via a Microwave‐Promoted Suzuki Coupling.
Authors: Skoumbourdis Amanda P. , Moore Susanna , Landsman Marc , Thomas Craig J.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Pincers Ligands Based on α‐Amino Acids. Part 2. Synthesis of Polydentate Ligands Based on 1,1′‐Diformylferrocene.
Authors: Cherevin M. S. , Gulevich T. G. , Borisova N. E. , Zubreichuk Z. P. , Kolesnikov G. V. , Reshetova M. D. , Knizhnikov V. A.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Proline Ureas: Synthesis and Pharmacological Evaluation as VLA‐4 Antagonists.
Authors: Sattigeri Viswajanani J. , Soni Ajay , Dastidar Sunanda G. , Ray Abhijit , Ahmad Sharif , Gupta Jung B. , Salman Mohammad
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Efficient Regioselective Functionalizations of Cyclodextrins Carried Out under Microwaves or Power Ultrasound.
Authors: Martina Katia , Trotta Francesco , Robaldo Bruna , Belliardi Nikka , Jicsinszky Laszlo , Cravotto Giancarlo
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Benzo‐γ‐carboline Alkaloid Cryptosanginolentine (VI) by Reaction of Indole‐2,3‐dicarboxylic Anhydrides with Anilines.
Authors: Miki Yasuyoshi , Kuromatsu Makoto , Miyatake Hideaki , Hamamoto Hiromi
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Paxiphyllines A (I) and B (II), New Alkaloids from Daphniphyllum paxianum
Authors: Zhang Yu , He Hongping , Di Yingtong , Mu Shuzhen , Wang Yuehu , Wang Junsong , Li Chunshun , Kong Ningchuan , Gao Suo , Hao Xiaojiang
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Metastable Phases in the Magnesium Spinel—Alumina System.
Authors: Hinklin T. R. , Laine R. M.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Solid—Solid Phase Transitions: Interface Controlled Reactivity and Formation of Intermediate Structures
Authors: Leoni Stefano
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: An Overview of Solution‐Based Semiconductor Nanowires: Synthesis and Optical Studies
Authors: Kuno Masaru
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires
Authors: Holesinger Terry G. , et al. et al.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: About Negative Magnetization in Non‐Superconducting Intermetallics
Authors: Suski W.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Soft X‐Ray Resonant Magnetic Scattering from Magnetic Nanostructures
Authors: van der Laan Gerrit
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Tapping into Boron/α‐Hydroxycarboxylic Acid Interactions in Sensing and Catalysis
Authors: Houston Todd A. , Levonis Stephan M. , Kiefel Milton J.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Organocatalytic Asymmetric Mannich Reactions: New Methodology, Catalyst Design, and Synthetic Applications
Authors: Ting Amal , Schaus Scott E.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Ruthenium Complex‐Catalyzed Highly Selective Co‐Oligomerization of Alkenes
Authors: Ura Yasuyuki , Tsujita Hiroshi , Mitsudo Take‐aki , Kondo Teruyuki
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Arjunolic Acid: A Renewable Template in Supramolecular Chemistry and Nanoscience
Authors: Bag Braja Gopal , Dinda Shaishab Kumar
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthetic Studies on Heterocyclic Antibiotics Containing Nitrogen Atoms
Authors: Kiyota Hiromasa
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Distillable Ionic Liquids for a New Multicomponent Reaction
Authors: Rosamilia Anthony E. , Strauss Christopher R. , Scott Janet L.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Position‐Flexible Elaboration of Halogenated Heterocycles: Metalated Species as Key Intermediates for Synthesis
Authors: Schlosser Manfred
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Kinetic Resolution and Desymmetrization by Stereoselective Silylation of Alcohols
Authors: Rendler Sebastian , Oestreich Martin
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Metal‐Catalyzed Enantioselective Allylation in Asymmetric Synthesis
Authors: Lu Zhan , Ma Shengming
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Iminium Catalysis
Authors: Erkkilae Anniina , Majander Inkeri , Pihko Petri M.
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Pharmacological Bases of Coffee Nutrients for Diabetes Prevention
Authors: Oka Kitaro
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Mechanism of DNA Damage and Apoptosis Induced by Anticancer Drugs Through Generation of Reactive Oxygen Species
Authors: Mizutani Hideki
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Pharmaceutical Support at Cardiovascular and Cardiovascular Surgery Ward
Authors: Machida Seiji , Masuda Kazuhisa , Kataoka Yasufumi
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Hybrid Molecules with a Dual Mode of Action: Dream or Reality?
Authors: Meunier Bernard
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Search and Structural Elucidation of Medicinal Products from the Vegetable Kingdom (Crude Drugs and Plant Materials)
Authors: Nakanishi Tsutomu
Published: March 2008

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Werkstoffe im Pumpenbau
Authors: Zils R.
Published: March 2008

Die Auswahlkriterien für Werkstoffe im Pumpenbau sind komplex. Ausschlaggebende Faktoren sind dabei die Beständigkeit in dem zu fördernden Medium sowie der Preis und die Verfügbarkeit. Aufgrund der enormen Anzahl der mittlerweile zur Verfügung stehenden Materialien werden hier nur die gängigsten Werkstoffe näher betrachtet. Das Einsatzspektrum der gängigen Pumpenwerkstoffe reicht dabei von kombinierter Beanspruchung aus Korrosion und Verschleiß über chemische Beständigkeit bis hin zur Beständigkeit gegen Abrasion und Erosion.
Prozesstechnische Analyse von Pumpensystemen in der Chemischen Industrie – ein Einsparpotenzial
Authors: Schicketanz W.
Published: March 2008

In verfahrenstechnischen Industrien, speziell in der chemischen Industrie, ist eine Pumpe eine von vielen einzelnen Apparaten und Maschinen, die in ihrer Gesamtheit und in ihrem Zusammenspiel eine Anlage konstituieren. Der Anteil der Pumpen einer Anlage, die in erster Linie Fluide handhaben, wird größenordnungsmäßig bei ca. 20 % liegen. Pumpensysteme verursachen somit einen beträchtlichen Teil der Gesamtinvestitions‐ und Betriebskosten. Dem Pumpensystem selbst kommt meist die Funktion zu, eine Flüssigkeit von einem Ort zu einem anderen Ort zu fördern. Es ist wichtig, das Umfeld eines Pumpensystems, insbesondere die verfahrenstechnischen Randbedingungen, zu hinterfragen und zu analysieren, denn diese Analyse kann Einsparpotenziale eröffnen und letztlich zu optimalen Systemen führen.
Vergleich von DGLRD‐Patronendichtungen auf Eignung für den Einsatz im Ex‐Bereich
Authors: Bestehorn D. H.
Published: March 2008

Gerade im Ex‐Bereich treten für Hersteller und Betreiber von Pumpen ständige Veränderungen bezüglich Markteinführung und dem Betreiben von Pumpen auf. Für viele Anwender wurde durch verschiedene Regelwerke und Richtlinien die Überprüfung der installierten Technik erforderlich. Bei Anwendungen, die im Sinne der TA‐Luft (Technische Anleitung zur Reinheit der Luft) oder auch ATEX‐( „Atmosphère explosible”︁) kritisch sind, werden Betreiber von Pumpen oftmals mit einer Umrüstung auf „technisch dichte Systeme”︁ konfrontiert. Alle Dichtungen erfüllen den Anspruch „technisch dicht”︁ zu sein. Sie sind somit im Falle der TA‐Luft‐Vorgaben verwendbar. Bei dem Einsatz von Dichtungen im Ex‐Bereich ist mit Vorsicht vorzugehen. Da bei der Umrüstung von Geräten in diesem Bereich je nach gewähltem Dichtungstyp eventuell die Einsatzgrenzen bzw. die potenziellen Zündquellen verändert werden können, ist eine sicherheitstechnische Bewertung empfehlenswert.
Schadensfälle durch unsachgemäßen Betrieb von Kreiselpumpen
Authors: Graever U.
Published: March 2008

In der petrochemischen und chemischen Industrie und damit in verfahrenstechnischen Anlagen sind Pumpen ein wichtiges Element. Die Zuverlässigkeit der Pumpe in so einem System ist äußerst wichtig, da die Kosten bei einem Produktionsausfall sehr hoch sind. Durch z. B. Umstrukturierungen oder Ruhestandsregelungen ist innerhalb von Unternehmen beim Personal in Produktion und Technik ein Rückgang an Kompetenzen festzustellen. Auswirkung, Ursache und Abhilfe werden in dieser Arbeit exemplarisch an zwei Beispielen von Pumpenschäden aufgezeigt.
Magnetkupplungspumpen in der Praxis – Energieeinsparpotenziale im Betrieb
Authors: Herbers T.
Published: March 2008

Aufgrund der Entwicklung im Bereich Permanentmagnet‐ sowie Gleitlagerwerkstoffe haben Magnetkupplungspumpen einen hohen technischen Stand erreicht und sind in der chemischen und petrochemischen Industrie akzeptiert. Doch gibt es weiterhin Potenzial für Verbesserungen, gerade im Bereich Energieeinsparung und Effizienzsteigerung. Pumpensysteme weisen einen Anteil von etwa 4 % am gesamten Weltstromverbrauch auf. Durch Verbesserung des Pumpenwirkungsgrades, durch Optimierung des Pumpensystemdesigns sowie der Systemsteuerung und durch Pumpenauslegung und Wartung kann von einem Energieeinsparpotenzial von bis zu 40 % ausgegangen werden.
Steigende Anforderungen an Zahnradpumpen – erfolgreiche Lösungen für die Praxis
Authors: Bachmann A. , Heinen M.
Published: March 2008

Zahnradpumpen werden in zahlreichen chemischen und industriellen Prozessen als vielseitige und zuverlässige Förderaggregate eingesetzt. Stetig steigende Anforderungen verlangen nach flexiblen Lösungen und modernster Technik. Durch die Verwendung geeigneter Materialien und Komponenten können eine Vielzahl fördertechnischer Probleme abgedeckt werden. Jedoch sind Zahnradpumpen, wie alle anderen Pumpentypen auch, Einschränkungen unterworfen, die es zu beachten gilt. Im Folgenden werden diese Grenzwerte an aktuellen Beispielen erklärt und weiterhin wird aufgezeigt, was aktuell technisch möglich ist. Auf zukünftige Betrachtungen wird ebenfalls eingegangen, um darzulegen, in welchen Bereichen weitere Entwicklungen zu erwarten sind. Aufbauend auf dem Funktionsprinzip der Zahnradpumpen werden die Applikationsgrenzen der Zahnradpumpen abhängig vom jeweiligen Fördermedium besprochen und aktuelle Lösungen aus der Praxis angeführt.
Auslegung von Pumpen für zähe oder feststoffhaltige Medien
Authors: Jaberg H.
Published: March 2008

Pumpen sind so enorm vielfältig wie fast keine andere Produktgruppe. Neben den Hauptgruppen der Kreiselpumpen sowie der rotierenden bzw. oszillierenden Verdrängerpumpen gibt es noch eine Reihe weiterer Sonderbauarten wie z. B. die Pitot‐Pumpe oder der hydraulische Widder. Aber auch die drei Hauptgruppen selbst lassen sich in viele weitere Unterbauarten aufteilen. So kann man zeigen, dass sich allein bei der Kreiselpumpe je nach Laufrad‐ und Leitradform, je nach Antriebs‐ und Aufstellungsart insgesamt über 20000 Bauformen beschreiben lassen. Und hierbei wurde noch nicht einmal auf die verschiedenen Materialvarianten eingegangen. Am Übergangsbereich zwischen der Kreiselpumpe und der rotierenden Verdrängerpumpe finden wir die Seitenkanal‐ und die eng verwandte Peripheralradpumpe. Die rotierenden Verdrängerpumpen weisen ebenfalls neben den Hauptvertretern Zahnrad‐, Schraubenspindel‐, Exzenterschnecken‐ und Kreiskolben‐Pumpe mehrere Untergruppen auf. Auch die auf den ersten Blick eher homogene Gruppe der oszillierenden Verdrängerpumpen (Kolben‐, Plunger‐ sowie Membranpumpe) weisen mit Einfach‐ und Mehrfachwirkung, hydraulischem und mechanischem Antrieb eine Variantenvielfalt auf. Sowohl in hydraulischer Hinsicht bezüglich Menge und Durchsatz als auch in Hinblick auf die Anwendungsgebiete weisen die verschiedenen Pumpentypen Gemeinsamkeiten und Überlappungen, aber auch wesentliche Unterschiede auf. In dieser Abhandlung wird auf die Auswahl der Pumpen für den Transport von zähen und feststoffbeladenen Medien eingegangen.
Kunststoffausgekleidete Magnetkupplungspumpen: Ein Konzept mit Zukunft
Authors: Rennett U. , Bahm F.
Published: March 2008

Das Bessere ist der Feind des Guten: Durch konstruktive Weiterentwicklungen und gezielte Optimierung einzelner Werkstoffeigenschaften haben sich kunststoffausgekleidete Magnetkupplungspumpen zu einer technischen Alternative zu Pumpen aus teuren Sondermetallen entwickelt und erobern sich neue Einsatzmöglichkeiten. In dieser Arbeit wird exemplarisch auf die weltweit größte kunststoffausgekleidete Magnetkupplungspumpe eingegangen, die das Fördern hochkorrosiver Medien ermöglicht.
Vorgehensweise bei der externen Beschaffung von Pumpen in der BASF
Authors: Bumb S. , Wild P. , Winkelmann T. , Bredehöft J.‐P.
Published: March 2008

Vorgestellt wird die globale Strategie der BASF zur Planung und Beschaffung von Pumpen. Es wird das geeignete Pumpensystem als auch der günstigste Lieferant ermittelt, wobei ein niedriger Angebotspreis nicht zwangsläufig zum Auftrag führen muss. Vielmehr sind die individuellen Randbedingungen der jeweiligen Aufgabenstellung mit ausschlaggebend für die Lieferantenauswahl.
Schadensmechanismen bei Schraubenspindelpumpen und Kreiselpumpen
Authors: Degen C.
Published: March 2008

Verschleiß und chemischer Angriff bei Kreiselpumpen

Mangelschmierung und Aeration

Ursachen und Abhilfemaßnahmen

Problembewältigung bei der Förderung alternativer Brennstoffe
Online Pumpenüberwachung: Ein Werkzeug der Maschineninstandhaltung der PCK‐Raffinerie Schwedt
Authors: Stargardt F.
Published: March 2008

Warum Onlineüberwachung

Vorteile durch Onlineüberwachung

Messprinzip

Aufbau des Pumpenfrühwarnsystems

Erfahrungen mit dem Onlinesystem

Ausblick in die Zukunft der Maschinendiagnostik der Raffinerie
Ist es nur die Pumpe? – Pumpenauswahl aus anlagentechnischer Sicht
Authors: Stevens P.
Published: March 2008

Typenauswahl

Grundlegende Prozessparameter

Fehlermöglichkeiten bei Auslegung und Pumpenauswahl

Gründe und Vorbeugungen
Myosin‐Va mediates RNA distribution in primary fibroblasts from multiple organs
Authors: Salerno Verônica P. , Calliari Aldo , Provance D. William , Sotelo‐Silveira José R. , Sotelo José R. , Mercer John A.
Published: March 2008

Myosin‐Va has been shown to have multiple functions in a variety of cell types, including a role in RNA transport in neurons. Using primary cultures of cells from organs of young dilute‐lethal (Myo5ad‐l/Myo5ad‐l) null mutant mice and wild‐type controls, we show that in some, but not all, tissues, RNA distribution is dramatically different in the homozygous null mutant cells. The dependence of RNA localization on myosin‐Va correlates with the relative abundance of the brain‐specific splicing pattern of the myosin‐Va tail. We also show that myosin‐Va is involved in RNA localization soon after synthesis, because the effects of its absence are diminished for RNAs that are more than 30 min old. Finally, we show that localization of β‐actin mRNA is significantly changed by the absence of myosin‐Va. These results suggest that myosin‐Va is involved in a transient transport or tethering function in the perinuclear region. Cell Motil. Cytoskeleton
2008. © 2008 Wiley‐Liss, Inc.
Nuclear factor I gene expression in the developing forebrain
Authors: Plachez Céline , Lindwall Charlotta , Sunn Nana , Piper Michael , Moldrich Randal X. , Campbell Christine E. , Osinski Jason M. , Gronostajski Richard M. , Richards Linda J.
Published: March 2008

Retrograde tracing of laterally projecting corticospinal neurons (blue) co‐labeled with NFIB (red). J. Comp. Neurol. 508:385–401, 2008. © 2008 Wiley‐Liss, Inc.
Flow‐Guided Assembly Processes
Authors: Wang Shengnian , Guan Jingjiao , Lee L. James
Published: March 2008

This Concept article focuses on capillary, hydrodynamics and electrokinetic flow‐guided assembly processes that can produce patterned or gradient functional surfaces either on solid surfaces or in deep micro‐ and nanoscale channels. This concept has the potential to produce low‐cost nanostructures, internal surface modifications, and devices in nanomedicine.
Synthesis of magnesium oxysulfate whiskers in the presence of sodium dodecyl benzene sulfonate
Authors: Sun X. T. , Xiang L.
Published: March 2008

Uniform magnesium oxysulfate (5Mg(OH)2·MgSO4·3H2O) whiskers with a length of 10‐15 µm and a diameter of 0.4‐1.0 µm were synthesized in the presence of sodium dodecyl benzene sulfonate (Na‐SO3‐C6H4‐C12H25) at 200°C for 1 h, using MgSO4·7H2O and NaOH as the reactants. Mg(OH)2 precursor with poor crystallization and small crystal size was formed owing to the adsorption of sodium dodecyl benzene sulfonate on the Mg(OH)2 surface. The quick dissolution of Mg(OH)2 precursor in the subsequent hydrothermal reaction inhibited the occurrence of the sector‐like byproduct and promoted the formation of magnesium oxysulfate whiskers with uniform morphology. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Crystallization of mefenamic acid and polymorphs
Authors: Cesur S. , Gokbel S.
Published: March 2008

The crystallization of Mefenamic Acid, (MA), which has a prevalent usage in drug formulation, was investigated. MA is a high‐dose, anti‐inflammatory, analgesic agent used for pain in menstrual disorders. Some negative properties of MA are a high hydrophobicity and propensity to stick to surfaces, which cause great problems during granulation and tabletting. To facilitate tabletability, enhance dissolution rates, and develop a stable and reproducible dosage form, investigation of the physicochemical properties of mefenamic acid is necessary. Pharmaceutical drugs are commonly crystalline materials and are therefore subject to polymorphism. Polymorphism, the ability of a substance to exist in more than one crystalline form, is a significant phenomenon in the field of chemical engineering sciences, including pharmaceutical development. Establishing the polymorphic behaviour of a drug molecule early in development minimizes the number of unsuitable candidates developed and reduces the risk of encountering issues later which may have a major financial and time impact. Mefenamic acid crystals were recrystallized from five different solvents of N, N‐dimethylformamide (DMF), acetone, N, N‐dimethylacetamide (DMA), Dimethylsulfoxide (DMS) and Ethyl Acetate (EA). In order to characterize the Mefenamic Acid crystal structure and the polymorphic forms of the crystals obtained by recrystallization, the scanning electron microscopy (SEM), Raman diffractometry and X‐ray pattern were used. From the industrial crystallization point of view, the crystal size distribution (CSD), the crystal shape, the polymorphic form and the crystallization steps are important factors that affect the quality and bioavailability of a drug. For the determination of crystal size distribution of MA, The Focused Beam Reflectance Measurement (FBRM) technique was practiced and CSD profiles were obtained. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Understanding the growth mechanism of CuI crystals during gel growth experiments
Authors: Gao Pan , Gu Mu , Lin‐Liu Xiao
Published: March 2008

Cuprous iodide crystals have been grown with decomplexation method in silica gel. Various crystal morphologies, such as polycrystalline aggregate, skeletal, dendrite, hopper crystals and regular tetrahedron crystals, were observed in different growth regions with an optical microscope. Their surfaces were photographed using a binocular metallographic microscope and the results were explained with the crystal growth mechanism which was determined by supersaturation. These observations support the general hypothesis that the concentration of reactant affects the relative growth rate by controlling the nucleation and diffusion. The mutual influence of the crystals grown in different regions was also discussed. Additionally, the suitable condition for getting regular tetrahedron crystals or large hopper crystals was obtained by changing the concentration of CuI·HI complex in the later period of crystal growth. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Communication between integrin receptors facilitates epicardial cell adhesion and matrix organization
Authors: Pae So Hyun , Dokic Danijela , Dettman Robert W.
Published: March 2008

Formation of the epicardium requires interactions between α4β1 integrin, and the extracellular matrix. We investigated the role of other integrins expressed by epicardial cells. We detected transcripts for α5, α8, αv, β1, β3, and β5 integrins in the chick proepicardial organ (PE). We demonstrate that α5β1, α8β1, and αvβ3 integrins are expressed by chick epicardial mesothelial cells (EMCs). Migration of EMCs in vitro was reduced by RGD‐containing peptides. Using adenoviruses expressing an antisense to chick α4 (AdGFPα4AS), full‐length (Adhα4V5), and C‐terminal deleted α4 (Adhα4ΔCV5), we found that EMCs were less able to adhere to vitronectin and fibronectin120 indicating that α4β1 plays a role in regulating EMC adhesion to ligands of α5β1, α8β1, and αvβ3. In Adhα4ΔCV5‐infected EMCs, α5β1 was diminished in fibrillar adhesions and new FN matrix assembly was abnormal. We propose that cooperation between α4β1 and RGD integrins is important for EMC adhesion and subepicardial matrix formation. Developmental Dynamics 237:962–978, 2008. © 2008 Wiley‐Liss, Inc.
Differential expression of duplicated genes for prothymosin alpha during zebrafish development
Authors: Donizetti Aldo , Liccardo Daniela , Esposito Daniela , Del Gaudio Rosanna , Locascio Annamaria , Ferrara Diana , Minucci Sergio , Aniello Francesco
Published: March 2008

We show that ptma, a single copy gene found in all organisms investigated so far, is duplicated in zebrafish. The two genes, ptmaa and ptmab, are individually controlled as indicated by their different expression patterns during embryonic development. Only the ptmab transcript is observed at 4 and 8 hpf of development in all embryonic cells, whereas both genes are expressed at later stages as revealed by in situ hybridization studies. In most cases, the two genes are expressed in the same territories, but only the ptmaa transcript was found in the trigeminal ganglion and in endodermal pouches. In the eye, at 72 hpf, the ptmaa and ptmab transcripts were found in amacrine cells, whereas only the ptmab transcript appeared in horizontal cells. The existence of two prothymosin genes indicates that their function in cell proliferation and differentiation is more complex in fishes than in mammals. Developmental Dynamics 237:1112–1118, 2008. © 2008 Wiley‐Liss, Inc.
Novel pre‐ and post‐gastrulation expression of Gata4 within cells of the inner cell mass and migratory neural crest cells
Authors: Pilon Nicolas , Raiwet Diana , Viger Robert S. , Silversides David W.
Published: March 2008

GATA4 is a transcription factor known to be important for the development of many organs such as the heart, intestine, and gonads. However, information regarding the control of its expression is only now beginning to emerge. To further understand the regulation of Gata4 expression during mouse embryonic development, we have generated a novel knockin allele allowing expression of the Cre recombinase under the control of Gata4 regulatory sequences. When these Gata4Cre/+ mice were crossed with the Cre reporter mouse R26R‐YFP, we surprisingly found widespread mosaic YFP expression in e10.0 embryos. This particular expression pattern was traced back to the e5.5 stage via a cell lineage study, suggesting activation of transcription at the Gata4 locus around the blastocyst stage. In accordance with this hypothesis, we found that Gata4 is expressed in cultured embryonic stem (ES) cells and within the inner cell mass (ICM) of e4.5 blastocysts. Interestingly, such early Gata4 transcription can be recapitulated in transgenic reporter studies using 5 kb of the proximal rat Gata4 promoter. During mouse development, these 5‐kb regulatory sequences were previously reported to direct reporter gene expression to Sertoli cells of the testes [Mazaud Guittot et al. (2007) Biol Reprod 76:85–95]. We now show that these regulatory sequences can also drive robust fluorescent reporter gene expression in migratory neural crest cells. Comparisons to Wnt1‐Cre‐mediated YFP labelling of neural crest cells suggest that most of the migratory neural crest cells are labelled in e9.5 to e11.5 Gata4p[5kb]‐RFP or ‐GFP embryos. Analysis of GFP transcription via whole‐mount in situ hybridization in e10.5 and e11.5 embryos demonstrated that the 5‐kb Gata4 promoter is preferentially active in cells of the boundary caps at the dorsal root entry zone and motor exit points flanking the neural tube. RT‐PCR gene expression analysis of FACS‐purified GFP‐positive cells from e9.5 Gata4p[5kb]‐GFP embryos revealed co‐expression of Gata4 with many neural crest stem cell markers. Together with sphere‐forming and differentiation cell culture assays, our results indicate that the Gata4 promoter is active within at least a subset of the neural crest stem cells. Taken altogether, our studies have revealed new Gata4 expression patterns during mouse embryonic development, which are controlled by its 5‐kb proximal 5′ flanking sequences. Developmental Dynamics 237:1133–1143, 2008. © 2008 Wiley‐Liss, Inc.
A Histone2BCerulean BAC transgene identifies differential expression of Phox2b in migrating enteric neural crest derivatives and enteric glia
Authors: Corpening Jennifer C. , Cantrell V. Ashley , Deal Karen K. , Southard‐Smith E. Michelle
Published: March 2008

The mammalian enteric nervous system (ENS) derives from migratory enteric neural crest–derived cells (ENCC) that express the transcription factor Phox2b. Studies of these enteric progenitors have typically relied on immunohistochemical (IHC) detection. To circumvent complicating factors of IHC, we have generated a mouse BAC transgenic line that drives a Histone2BCerulean (H2BCFP) reporter from Phox2b regulatory regions. This construct does not alter the endogenous Phox2b locus and enables studies of normal neural crest (NC) derivatives. The Phox2b‐H2BCFP transgene expresses the H2BCFP reporter in patterns that recapitulate expression of endogenous Phox2b. Our studies reveal Phox2b expression in mature enteric glia at levels below that of enteric neurons. Moreover, we also observe differential expression of the transgene reporter within the leading ENCC that traverse the gut. Our findings indicate that the wavefront of migrating enteric progenitors is not homogeneous, and suggest these cells may be fate‐specified before expression of mature lineage markers appears. Developmental Dynamics 237:1119–1132, 2008. © 2008 Wiley‐Liss, Inc.
Expression of the Drosophila secreted cuticle protein 73 (dsc73) requires shavenbaby
Authors: Andrew Deborah J. , Baker Bruce S.
Published: March 2008

Low stringency genomic library screens with genomic fragments from the sex determination gene doublesex identified the Drosophila
secreted
cuticle protein 73 (dsc73) gene, which encodes an 852‐residue protein with an N‐terminal signal sequence. In embryos, dsc73 RNA and protein are expressed to high levels in the epidermal cells that secrete the larval cuticle as well as in other cuticle‐secreting tissues such as the trachea and salivary duct. Embryonic expression of dsc73 requires Shavenbaby, a transcription factor regulating cuticle formation. Double‐labeling experiments with αCrb and αSAS reveal that, as with chitin and other known cuticle proteins, Dsc73 is secreted apically. Zygotic loss of dsc73 results in larval lethality but loss does not result in overt patterning defects or overt morphological defects in the embryonic tissues in which it is expressed. Thus, dsc73 encodes a novel secreted protein, and it is conserved within the Drosophila group. dsc73 may serve as a useful embryonic marker for cuticular patterning. Developmental Dynamics 237:1198–1206, 2008. © 2008 Wiley‐Liss, Inc.
Discovery of transcription factors and other candidate regulators of neural crest development
Authors: Adams Meghan S. , Gammill Laura S. , Bronner‐Fraser Marianne
Published: March 2008

Neural crest cells migrate long distances and form divergent derivatives in vertebrate embryos. Despite previous efforts to identify genes up‐regulated in neural crest populations, transcription factors have proved to be elusive due to relatively low expression levels and often transient expression. We screened newly induced neural crest cells for early target genes with the aim of identifying transcriptional regulators and other developmentally important genes. This yielded numerous candidate regulators, including 14 transcription factors, many of which were not previously associated with neural crest development. Quantitative real‐time polymerase chain reaction confirmed up‐regulation of several transcription factors in newly induced neural crest populations in vitro. In a secondary screen by in situ hybridization, we verified the expression of >100 genes in the neural crest. We note that several of the transcription factors and other genes from the screen are expressed in other migratory cell populations and have been implicated in diverse forms of cancer. Development Dynamics 237:1021–1033, 2008. © 2008 Wiley‐Liss, Inc.
Influence of Hormones and Hormone Metabolites on the Growth of Schwann Cells Derived From Embryonic Stem Cells and on Tumor Cell Lines Expressing Variable Levels of Neurofibromin
Authors: Roth Therese M. , Ramamurthy Poornapriya , Muir David , Wallace Margaret R. , Zhu Yuan , Chang Lou , Barald Kate F.
Published: March 2008

A benign human plexiform neurofibroma cell. Note the extensive tubulin networks (red), which become disrupted after addition of 2ME2, an estrogen metabolite implicated in tumor toxicity. The green staining represents S100 staining, indicating the Schwann Cell origin of the tumor cells. Blue is DAPI nuclear staining. See Roth et al., Developmental Dynamics 237:513–524, 2008. © 2008 Wiley‐Liss, Inc.
Synthetic Strategies for Oseltamivir Phosphate (Eur. J. Org. Chem. 11/2008)
Authors: Shibasaki Masakatsu , Kanai Motomu
Published: March 2008

The cover picture shows the chemical structure of oseltamivir phosphate (Tamiflu). Its representative starting materials and the asymmetric catalysts that provide its starting materials are also shown. Anybody can catch influenza. However, it is very scary, as it can be fatal. Oseltamivir phosphate is a potent antiinfluenza drug, that could protect humans from a possible influenza pandemic. The development of a synthetic route for oseltamivir phosphate that can satisfy its worldwide demand in a safe and environmentally friendly way is a great challenge today. In the Microreview by M. Shibasaki and M. Kanai on p. 1839 ff, synthetic strategies of oseltamivir are presented.
Hybrid and multi‐point formulations of the lowest‐order mixed methods for Darcy's flow on triangles
Authors: Younes Anis , Fontaine Vincent
Published: March 2008

Mixed finite element (MFE) and multipoint flux approximation (MPFA) methods have similar properties and are well suited for the resolution of Darcy's flow on anisotropic and heterogeneous domains.

In this work, the link between hybrid and MPFA formulations is shown algebraically for the lowest order mixed methods of Raviart–Thomas (RT0) and Brezzi–Douglas–Marini (BDM1) on triangles. The efficiency of the four mixed formulations (Hybrid_RT0, MPFA_RT0, Hybrid_BDM1 and MPFA_BDM1) is investigated on high anisotropic and heterogeneous media and for unstructured triangular discretizations.

Numerical experiments show that the MPFA_BDM1 formulation outperforms both Hybrid_RT0 and Hybrid_BDM1 in the case of anisotropic domains and highly unstructured meshes. Copyright © 2008 John Wiley & Sons, Ltd.