bluuebunny/crossref_metadata_2025_split huggingface dataset:
Scale measurements as a conservation tool in endangered Zingel asper (Linnaeus, 1758)
Authors: Danancher D. , Labonne J. , Gaudin P. , Joly P. 
Published: January 2007

Abstract
Zingel asper (a percid) is a highly endangered endemic fish of the Rhone catchment (France). Scale reading was used to estimate age and growth rates in one of the two last remaining populations that are still present in relatively high densities (River Beaume).
Scale reading was validated for the first time in Z. asper by comparing back‐calculated lengths from scale annual increment to actual lengths obtained by individual mark–recapture monitoring. The impacts of age or sampling site on individual growth rates were explored using generalized linear models.
No major discrepancy was observed between actual and back‐calculated lengths. Longevity of Z. asper was inferred from the age data and did not exceed 3 years. Results showed variation in growth rates among ages (20 times higher for 1+ fish than for 2+ or 3+ fish) and also among sampling sites.
The present work provided the first estimates of annual growth rates in the Beaume population. This study also showed that scale reading allowed a valuable trade‐off between accuracy and conservation imperatives that often imply avoiding invasive techniques such as the implantation of passive integrative transponders.
Scale reading will be a valuable tool for future ecological studies in Z. asper and will help in developing conservation strategies for this species as longevity and growth patterns are two life‐history traits of major importance for the management of endangered populations.
Copyright © 2007 John Wiley & Sons, Ltd.
Optimization of bio‐hydrogen production from biodiesel wastes byKlebsiella pneumoniae
Authors: Liu Fei , Fang Baishan 
Published: January 2007

AbstractBiodiesel wastes containing glycerol were utilized byKlebsiella pneumoniaeDSM 2026 to produce hydrogen. The optimization of medium components was performed using both Plackett‐Burman and uniform design methods. Using the Plackett‐Burman design, glycerol, yeast extract, NH4Cl, KCl and CaCl2 were found to be the most important components, which were further investigated by uniform design and second‐order polynomial stepwise regression analysis. The optimized medium containing 20.4 g·L‐1glycerol, 5.7 g·L‐1KCl, 13.8 g·L‐1NH4Cl, 1.5 g·L‐1CaCl2and 3.0 g·L‐1yeast extract resulted in 5.0‐fold increased level of hydrogen (57.6 mL/50 mL medium) production compared to initial level (11.6 mL/50 mL medium) after 24 h of fermentation The optimization of fermentation condition (pH, temperature and inoculum) was also conducted. When the strain grew in the optimized medium under optimal fermentation condition in a 5‐L stirred tank bioreactor for batch production, hydrogen yield and production reached 0.53 mol/mol and 117.8 mmol/L, respectively. The maximum hydrogen evolution rate was 17.8 mmol/(L·h). Furthermore, 1,3‐propanediol (6.7 g·L‐1) was also obtained from the liquid medium as a by‐product.
Enzymatic coating of lignocellulosic surfaces with polyphenols
Authors: Schroeder Marc , Aichernig Nina , Guebitz Georg M. , Kokol Vanja 
Published: January 2007

AbstractUpgrading of the surface characteristics could enhance the bulk properties of naturally abundant fiber‐forming materials for better performance or create new value‐added products. Laccase can induce cross‐linkage and covalent coupling of low molecular weight compounds onto lignocellulosic surfaces. For this purpose the 38‐kDa laccase from Trametes hirsuta was purified and characterized. The best conditions for laccase‐induced coating of flax fibers were determined. This evaluation was based on the obtained coloration and color depth. A screening was carried out with different phenols for their potential as monomers for enzyme‐catalyzed polymerization resulting in a coating with antibacterial performance. While all the methoxyphenols showed different coloration with weak fastness properties, bacterial growth of Bacillus subtilis and Staphylococcus aureus was reduced significantly using ferulic acid and hydroquinone. Using laccase‐induced coupling and polymerization, multi‐functionality of the lignocellulosic surface, such as coloration and antimicrobial performance, was achieved, which depended on the nature of the applied phenolic monomer.
Molecular assembly formation of cyclic hexa‐β‐peptide composed of acetylated glycosamino acids
Authors: Hirata Tatsuya , Fujimura Futoshi , Horikawa Yoshiki , Sugiyama Junji , Morita Tomoyuki , Kimura Shunsaku 
Published: January 2007

AbstractA novel cyclic hexamer of acetylated β‐glycosamino acid was synthesized and its conformation and molecular assembly formation was investigated. Variable temperature NMR study indicated that the cyclic hexapeptide took a C3 symmetric conformation at room temperature, but at elevated temperatures a C6 symmetric one, which was not due to averaging of the C3 symmetric conformation, appeared. Computational geometry optimization showed that the C6 symmetric conformation was a highly planar structure with amide groups orienting perpendicular to the ring plane. The cyclic hexa‐β‐peptide formed rod‐shaped crystals from an N,N‐dimethyl formamide solution at elevated temperature. The optical microscopy observation with a sensitive tint plate under cross‐nicol configuration and electron diffraction analysis of the crystals revealed that the cyclic hexa‐β‐peptides were stacked one after the other to form a regular nanotube structure. © 2007 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 88: 150–156, 2007.This article was originally published online as an accepted preprint. The ‘Published Online’ date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
EZ‐Viz, a tool for simplifying molecular viewing in PyMOL
Authors: Grell Laura , Parkin Christopher , Slatest Len , Craig Paul A. 
Published: January 2007

AbstractPyMOL is a molecular modeling program that can be used in a wide range of studies within the scientific community. Its ability to produce informative, detailed, stereoscopic images makes it a very powerful tool both in the laboratory and in the classroom. However, the PyMOL user interface is difficult to use, and the PyMOL User's Manual readily admits that “development has been focused on capabilities, not on ease‐of‐use for new users.” To resolve this, we set out to develop a new interface for PyMOL that helps eliminate the need for command line interactions, making it a much more user‐friendly interface. We have created a tabbed interface called EZ‐Viz, which contains a series of buttons and entry fields that allow users to select given attributes of a molecule and make changes to it by clicking a button as opposed to issuing highly syntactical commands. Other features of the interface include a Chime/PyMOL command converter, nine preset molecular views, four molecular movies, and molecular sequence and hetero atom information, all at the click of a button. The ongoing and continued development of EZ‐Viz could help to further the use of PyMOL, which we believe to be one of the most powerful molecular viewing programs currently available.
Analyzing ligand depletion in a saturation equilibrium binding experiment
Authors: Claro Enrique 
Published: January 2007

AbstractI present a proposal for a laboratory practice to generate and analyze data from a saturation equilibrium binding experiment addressed to advanced undergraduate students. [3H]Quinuclidinyl benzilate is a nonselective muscarinic ligand with very high affinity and very low nonspecific binding to brain membranes, which contain a high density of muscarinic receptors. These features allow the instructor to devote especial emphasis to evaluate ligand depletion, and therefore, stress the subtle but fundamental difference between total (added) ligand and free ligand concentration at equilibrium.
Oxidative hemolysis of erythrocytes
Authors: Włodek Lidia , Kusior Dorota 
Published: January 2007

AbstractThis exercise for students will allow them to simultaneously observe lipid peroxidation and consequent hemolysis of rat erythrocytes and the effect of sodium azide, a catalase inhibitor, on these processes. It will also demonstrate a protective action of antioxidants, the therapeutically used N‐acetylcysteine and albumins present in plasma.
P‐Glycoprotein Inhibitory Activity of Two Phenolic Compounds, (−)‐Syringaresinol and Tricin from Sasa borealis
Authors: Jeong Yeon Hee , Chung Soo Yeon , Han Ah‐Reum , Sung Min Kyung , Jang Dae Sik , Lee Jun , Kwon Youngjoo , Lee Hwa Jeong , Seo Eun‐Kyoung 
Published: January 2007

Abstract(−)‐Syringaresinol and tricin, isolated from the AcOEt‐soluble extract of the whole plants of Sasa borealis (Gramineae), showed inhibitory effects on the P‐glycoprotein in adriamycin‐resistant human breast cancer cells, MCF‐7/ADR.
Efficient Synthesis of Solasodine, O‐Acetylsolasodine, and Soladulcidine as Anticancer Steroidal Alkaloids
Authors: Zha Xiaoming , Sun Hongbin , Hao Jia , Zhang Yihua 
Published: January 2007

AbstractAn efficient synthesis of the steroidal alkaloids solasodine (1), O‐acetylsolasodine (2), and soladulcidine (3) starting from easily available diosgenin and tigogenin in five or six steps (overall yield 25, 24, and 28%, resp.) is described. Moreover, our synthetic route provides a selective modification at C(3) of 1 and related compounds in order to carry out lead optimization on these natural antitumor steroidal alkaloids.
A New Flavone Xyloside and Two New Flavan‐3‐ol Glucosides from Juniperus communis var. depressa
Authors: Iida Naoki , Inatomi Yuka , Murata Hiroko , Inada Akira , Murata Jin , Lang Frank A. , Matsuura Nobuyasu , Nakanishi Tsutomu 
Published: January 2007

AbstractA new flavone xyloside, 1, and two new flavan‐3‐ol glucosides, 3 and 4, were isolated together with three known flavones, 2, 11, and 12, five known flavans, 5–9, and a known dihydrochalcone, 10, from the stems and leaves of Juniperus communis var. depressa (Cupressaceae) collected in Oregon, U.S.A., and their structures were determined on the basis of spectral evidence. A novel flavone nucleus such as that in 1 is seldom found in nature today, and new methylcatechin glucosides 3 and 4 are also rare in nature. In addition, we investigated the inhibitory activity of individual components, i.e., 8–11, and others, that were abundantly isolated from the same plant material for the Maillard reaction.
Synthesis and Biological Studies of N‐Alkylated Cyclic Diamines
Authors: Xiong Xiao‐Qin , Liang Feng , Yang Li , Zhou Xiang , Zheng Cong‐Yi , Cao Xiao‐Ping 
Published: January 2007

AbstractSeveral alkyl‐substituted mesocyclic diamines were synthesized, and their interaction with DNA were studied by melting‐temperature measurements and the ethidium bromide (EB)‐fluorescence competitive method. The supercoiled DNA hydrolytic cleavage by 1,4‐dioctyl‐1,4‐diazepan‐6‐ol (4) was supported by the evidence from free‐radical quenching and T4‐ligase ligation. Preliminary pharmacological tests showed that only 1,4‐dioctyl‐1,4‐diazepan‐6‐ol (4) had antitumor activity against HeLa cell lines in vitro.
Controlling the Association of Adamantyl‐Substituted Poly{N‐[tris(hydroxymethyl)methyl]acrylamide} and a β‐Cyclodextrin/Epichlorohydrin Polymer by a Small Drug Molecule – Naproxen
Authors: Mislovičová Danica , Kogan Grigorij , Gosselet Noëlle Martine , Sébille Bernard , Šoltés Ladislav 
Published: January 2007

AbstractTwo polymeric substances, a poly{N‐[tris(hydroxymethyl)methyl]acrylamide} (THMMA) substituted with adamantyl moieties and a β‐cyclodextrin/epichlorohydrin polycondensate, formed a host–guest type complex, which resulted in the gel formation upon mixing of these two compounds at appropriate conditions. Introduction of a drug molecule, i.e., naproxen, that was able to fill the β‐cyclodextrin cavities, thus expulsing adamantyl moieties, led to disruption of such association and inhibition of gel formation. The conditions required for the association of the two polymeric components and formation of the gel, as well as the dynamics of its inhibition by addition of naproxen was established. The procedure of using solutions of two associating polymers and an appropriate drug competitor can be used at targeted viscosupplementation.
Chemistry, Urease Inhibition, and Phytotoxic Studies of Binuclear Vanadium(IV) Complexes
Authors: Ara Rifat , Ashiq Uzma , Mahroof‐Tahir Mohammad , Maqsood Zahida Tasneem , Khan Khalid Mohammed , Lodhi Muhammad Arif , Choudhary Muhammad Iqbal 
Published: January 2007

AbstractVanadium plays an important role in biological systems and exhibits a variety of bioactivities. In an effort to uncover the chemistry and biochemistry of vanadium with nitrogen‐ and oxygen‐containing ligands, we report herein the synthesis and spectroscopic characterization of vanadium(IV) complexes with hydrazide ligands. Substituents on these ligands exhibit systematic variations of electronic and steric factors. Elemental and spectral data indicate the presence of a dimeric unit with two vanadium(IV) ions coordinated with two hydrazide ligands along with two H2O molecules. The stability studies of these complexes over time in coordinating solvent, DMSO, indicates binding of the solvent molecules to give [V2O2L2(H2O)2(DMSO)2]2+ (L=hydrazide ligand) and then conversion of it to a monomeric intermediate species, [VOL(DMSO)3]1+. Hydrazide ligands are inactive against urease, whereas vanadium(IV) complexes of these ligands show significant inhibitory potential against this enzyme and are found to be non‐competitive inhibitors. These complexes also show low phytotoxicity indicating their usefulness for soil ureases. Structure–activity relationship studies indicate that the steric and/or electronic effects that may change the geometry of the complexes play an important role in their inhibitory potential and phytotoxicity.
A Novel Method for the Assessment of Methyl Parathion by Using Coupling Agents in Environmental and Commercial Samples
Authors: Nagaraja Padmarajaiah , Bhaskara Besagarahally L. 
Published: January 2007

AbstractA sensitive and rapid spectrophotometric method for the determination of reduced methyl parathion (=O,O‐dimethyl O‐(4‐nitrophenyl) phosphorothioate) is described. The method is based on the interaction of diazotized reduced methyl parathion with 8‐hydroxyquinoline (=quinolin‐8‐ol; 8‐HQ) and 3‐aminophenol (3‐AP) as new coupling agents. Absorbances of the resulting chromophores are measured at 430 and 440 nm, respectively, and colored products were stable for at least 2 days. Beer's law is obeyed over the methyl parathion concentration range 0.2–5.5 μg ml−1 for 8‐HQ and 0.5–6.0 μg ml−1 for 3‐AP. From the data, it was confirmed that the two coupling agents can be effectively applied for the determination of methyl parathion in environmental and commercial samples.
Guaiane Sesquiterpene Lactones from Salvia nubicola (Lamiaceae)
Authors: Ali Muhammad S. , Ibrahim Syed A. , Ahmed Shakeel , Lobkovsky Emil 
Published: January 2007

AbstractA new sesquiterpene lactone, nubiol (1), belonging to the guaiane class, along with a dimer, bisnubidiol (2), has been isolated from Salvia nubicola collected from Quetta, Pakistan. The structures of both metabolites were elucidated with the aid of spectroscopic techniques including 2D‐NMR. Additionally, the structure of nubiol (1) was finally confirmed via the single crystal X‐ray diffraction. Nubiol (1) was found moderately active against Pseudomonas aeruginosa.
Chemical Constituents of Plants from the Genus Symplocos
Authors: Huo Chang‐Hong , Shen Li‐Ru , Zhao Yu‐Ying , Liang Hong 
Published: January 2007

AbstractThe chemical constituents of Symplocos genus were reviewed with 90 structures and 28 references cited. These constituents include triterpenoids, flavonoids, lignans, phenols, steroids, alkaloids, and iridoids. Triterpenoids are the dominant constituents within the genus Symplocos, some of them exhibited antiproliferative effects. Some phenolic glycoside derivatives showed inhibitory activity against snake‐venom phosphodiesterase I and human nucleotide pyrophosphatase phosphodiesterase.
Two‐Step Novel Synthesis of 2‐Amino‐6‐ (1,3‐dioxo‐2,3‐dihydro‐1H‐inden‐2‐yl) ‐4,7‐diphenyloxepine‐3‐carbonitrile and 5‐(1,3‐Dioxo‐2,3‐dihydro‐1H‐inden‐2‐yl) ‐2‐imino‐6‐phenyl‐2H‐pyran‐3‐carbonitrile.
Authors: Elmaaty Tarek M. Abou 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Unexpected Formation of Bicyclic Cyclopropane Lactam and Pyridone from the Reaction of cis‐2‐Aryl‐1‐carbomethoxy‐3,3‐dicynocyclopropane with Primary Aliphatic Amine via Isomerization and Rearrangement.
Authors: Ren Zhongjiao , Cao Weiguo , Wang Sihui , Wang Yun , Lu Yeying 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of Novel Bis‐Condensed Heterocyclic Ring Assembly Systems.
Authors: Sachar Anand , Sharma R. L. , Kumar Surinder , Kaur Daljeet , Singh Jasbir 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
KHSO4×H2O/SiO2‐Catalyzed, One‐Pot, Solvent‐Free Synthesis of Pyrazolines, Tetrahydrocarbozoles and Indoles Using Microwave Irradiation.
Authors: Kapoor Kamal K. , Ganai Bilal A. , Kumar Satish , Andotra Charanjeet S. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Methyltrioxorhenium and Sodium Bromide‐Catalyzed Oxidation of Alcohols to Carbonyl Compounds with H2O2 Using 1‐Butyl‐3‐methylimidazolium Tetrafluoroborate Ionic Liquid as a Novel Recyclable Green Solvent.
Authors: Jain Suman L. , Sharma Vishal B. , Sain Bir 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Oxidation of Benzylic Alcohols to Their Corresponding Carbonyl Compounds Using KIO4 in Ionic Liquid by Microwave Irradiation.
Authors: Hajipour Abdol Reza , Rafiee Fatemeh , Ruoho Arnold E. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Polyvinylpyridine as a Novel Solid Heterogeneous, Recyclable Catalyst for aza‐Michael Reaction.
Authors: Raje Vivek P. , Bhat Ramakrishna P. , Samant Shriniwas D. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Studies on the Allylation Reactions of Aldehydes and Ketones with Lanthanum in Water.
Authors: Bian Yan‐Jiang , Zhang Jian‐Qiang , Xia Jin‐Ping , Li Ji‐Tai 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Highly Regioselective Rhodium‐Catalyzed Hydroformylation of Unsaturated Esters: The First Practical Method for Quaternary Selective Carbonylation.
Authors: Clarke Matthew L. , Roff Geoffrey J. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ion‐Supported Chiral Pyrrolidines as Enantioselective Catalysts for Direct Michael Addition of Nitroalkenes in [BMIm]PF6.
Authors: Xu Danqian , Luo Shuping , Yue Huadong , Wang Liping , Liu Yunkui , Xu Zhenyuan 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The First Catalytic Mannich‐Type Reaction of N‐Alkoxycarbonylamino Sulfones with Silyl Enolates.
Authors: Ollevier Thierry , Nadeau Etienne , Eguillon Jean‐Christophe 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Asymmetric Addition of Diethylzinc to Diphenylphosphinoyl‐Imines Catalyzed by Copper(II) Trifluoromethanesulfonate‐Chiral (2′‐Ethylamino‐[1,1′]binaphthalenyl‐2‐yl)‐thiophosphoramidic Acid O,O′‐Diaryl Ester Ligands.
Authors: Shi Min , Lei Zhi‐Yu , Xu Qin 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Simple and Eco‐Friendly Reduction of Nitroarenes to the Corresponding Aromatic Amines Using Polymer‐Supported Hydrazine Hydrate over Iron Oxide Hydroxide Catalyst.
Authors: Shi Qixun , Lu Rongwen , Jin Kun , Zhang Zhuxia , Zhao Defeng 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of Optically Pure Terminal Epoxide and 1,2‐Diol via Hydrolytic Kinetic Resolution Catalyzed by New Heterometallic Salen Complexes.
Authors: Thakur Santosh Singh , Chen Shu‐Wei , Li Wenji , Shin Chang‐Kyo , Koo Yoon‐Mo , Kim Geon‐Joong 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of β,γ,γ‐Tri‐ or γ,γ‐Disubstituted α‐Methylene‐γ‐butyrolactones Starting from the Baylis—Hillman Adducts.
Authors: Lee Ka Young , Park Da Yeon , Kim Jae Nyoung 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Rapid One‐Pot Preparation of 2‐Substituted Benzimidazoles from Esters Using Microwave Conditions.
Authors: Jing Xiaobi , Zhu Qihua , Xu Feng , Ren Xinfeng , Li Dong , Yan Chaoguo 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis and Mass Spectral Study of New Phenylsulfonyl Substituted Isoxazolidines.
Authors: Dueruest Yasar , Altug Cevher , Sinkkonen Jari , Martiskainen Olli , Pihlaja Kalevi 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Practical Synthesis of 5′‐(4′‐Methylbiphenyl‐2‐yl)‐1H‐tetrazole.
Authors: Kantevari Srinivas , Nair C. K. Snehalatha , Pardhasaradhi M. 
Published: January 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.