bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Transamidation of Primary Amides with Amines Catalyzed by Zirconocene Dichloride.
Authors: Atkinson Benjamin N. , Chhatwal A. Rosie , Lomax Helen V. , Walton James W. , Williams Jonathan M. J. 
Published: March 2013

AbstractZirconocene dichloride is found to efficiently catalyze acylation reaction with amides [cf.
ChemInform Abstract: Tandem Catalysis with a Bifunctional Site‐Isolated Lewis Acid—Broensted Base Metal—Organic Framework, NH2‐MIL‐101(Al).
Authors: Srirambalaji Renganathan , Hong Soonsang , Natarajan Ramalingam , Yoon Minyoung , Hota Raghunandan , Kim Yonghwi , Ko Young Ho , Kim Kimoon 
Published: March 2013

AbstractThe catalyst is effective in a tandem Meinwald rearrangement—Knoevenagel condensation and can be recycled.
ChemInform Abstract: A Novel Copper‐Catalyzed, One‐Pot Synthesis of Symmetric Organic Disulfides from Alkyl and Aryl Halides: Potassium 5‐Methyl‐1,3,4‐oxadiazole‐2‐thiolate as a Novel Sulfur Transfer Reagent.
Authors: Soleiman‐Beigi Mohammad , Mohammadi Fariba 
Published: March 2013

AbstractVarious title compounds can be prepared in a simple manner.
ChemInform Abstract: A Practical Synthesis and Applications of (E)‐Diphenyl‐β‐(trifluoromethyl)vinylsulfonium Triflate.
Authors: Kasai Noritaka , Maeda Ryoko , Furuno Hiroshi , Hanamoto Takeshi 
Published: March 2013

AbstractAn improved approach to the title compound (V) is developed.
ChemInform Abstract: Tuning the Reactivity of Difluoromethyl Sulfoximines from Electrophilic to Nucleophilic: Stereoselective Nucleophilic Difluoromethylation of Aryl Ketones.
Authors: Shen Xiao , Zhang Wei , Ni Chuanfa , Gu Yucheng , Hu Jinbo 
Published: March 2013

AbstractDesulfoximination of resulting compounds (III) results in the formation of enantiomerically enriched difluoromethyl alcohols shown for (IIIa).
ChemInform Abstract: Palladium on Carbon‐Catalyzed Cross‐Coupling Using Triarylbismuths.
Authors: Monguchi Yasunari , Hattori Tomohiro , Miyamoto Yasuhiro , Yanase Takayoshi , Sawama Yoshinari , Sajiki Hironao 
Published: March 2013

AbstractThree protocols for coupling of triarylbismuths with aryl halides are developed.
ChemInform Abstract: Palladium‐Catalyzed Cross‐Coupling Reaction of Aryl(trialkyl)silanes with Aryl Nitriles.
Authors: Tang Shi , Li Shu‐Hua , Yan Wen‐bin 
Published: March 2013

AbstractA notable feature of the cross‐coupling is the high stability of the organosilanes and the absence of fluoride‐containing reagents.
ChemInform Abstract: Direct C—H Alkylation of Naphthoquinones with Amino Acids Through a Revisited Kochi—Anderson Radical Decarboxylation: Trends in Reactivity and Applications.
Authors: Naturale Guillaume , Lamblin Marc , Commandeur Claude , Felpin Francois‐Xavier , Dessolin Jean 
Published: March 2013

AbstractHighly functionalized naphthoquinones are prepared by Kochi—Anderson radical decarboxylation of amino acids.
ChemInform Abstract: Asymmetric [3 + 2] Annulation of N‐Protected Isatins with But‐3‐yn‐2‐one Catalyzed by DIOP: Facile Creation of Enantioenriched Spiro[furan‐2,3′‐indoline]‐2′,4(5H)‐dione.
Authors: Lian Zhong , Shi Min 
Published: March 2013

AbstractAn organocatalytic method for preparation of the labile title compounds is presented.
ChemInform Abstract: One‐Pot Sequential Combination of Multi‐Component and Multi‐Catalyst: Synthesis of 5‐Aminobenzofurans from Aminophenol and Ketene Acetals.
Authors: Yang Cheng‐Wen , Bai Yue‐Xia , Zhang Ni‐Tao , Zeng Cheng‐Chu , Hu Li‐Ming , Tian Hong‐Yu 
Published: March 2013

AbstractThe reaction of ketene acetals (I) with p‐aminophenol tosylates in the presence of hypervalent iodine and BF3 and CuBr2 as catalysts gives benzofurans in moderate yields.
ChemInform Abstract: Design and Synthesis of Condensed Thienocoumarins by Suzuki—Miyaura Reaction/Lactonization Tandem Protocol.
Authors: Iaroshenko Viktor O. , Ali Sajid , Mkrtchyan Satenik , Gevorgyan Ashot , Babar Tariq Mahmood , Semeniuchenko Volodymyr , Hassan Zahid , Villinger Alexander , Langer Peter 
Published: March 2013

AbstractSubstrates of type (I) and (VII) are subjected to Suzuki—Miyaura coupling.
ChemInform Abstract: Pd‐Catalyzed Tandem Cyclization of Ethyl Glyoxalate and Amines: Rapid Assembly of Highly Substituted Cyclic Dehydro‐α‐amino Acid Derivatives.
Authors: Luo Yueting , Lu Xiaoxia , Ye Yong , Guo Ya , Jiang Huanfeng , Zeng Wei 
Published: March 2013

AbstractA possible mechanism via an α‐imino ester intermediate inserted into a hydrogen‐palladium species is described.
ChemInform Abstract: Accessing N‐Heteroarylated Indoles and Benzimidazoles from 2‐Alkynyl Cyclohexadienimines and Cyclohexadienones Through Metal‐Catalyzed Tandem Reactions.
Authors: Yang Min , Tang Jie , Fan Renhua 
Published: March 2013

AbstractThe protecting group of starting material (I) plays a pivotal role.
ChemInform Abstract: A Novel Approach for Highly Regio‐ and Stereoselective Synthesis of (Z)‐3‐Methyleneisoindoline‐1‐ones in Aqueous Micellar Medium.
Authors: Sarkar Swarbhanu , Dutta Samrat , Dey Rajdip , Naskar Subhendu 
Published: March 2013

AbstractThe optimized conditions allow an efficient and rapid approach to the biologically important heterocyclic ring system.
ChemInform Abstract: Enantioselective Synthesis of Substituted Indoles Through Zirconium(IV)‐Catalyzed Friedel—Crafts Alkylation.
Authors: Blay Gonzalo , Fernandez Isabel , Pedro Jose R. , Vila Carlos 
Published: March 2013

AbstractThe method allows the introduction of a C‐3 side chain bearing a tertiary stereogenic center.
ChemInform Abstract: Straightforward Protocol for the Efficient Synthesis of Varied N1‐Acylated (Aza) Indole 2‐/3‐Alkanoic Acids and Esters: Optimization and Scale‐up.
Authors: Liedtke Andy J. , Kim Kwangho , Stec Donald F. , Sulikowski Gary A. , Marnett Lawrence J. 
Published: March 2013

AbstractThe indole precursors for the acylation reaction are synthesized by esterification of commercially available indole substrates or by Fischer indole synthesis.
ChemInform Abstract: Cascade Dearomatization of N‐Substituted Tryptophols via Lewis Acid‐Catalyzed Michael Reactions.
Authors: Liu Chuan , Zhang Wei , Dai Li‐Xin , You Shu‐Li 
Published: March 2013

AbstractThe dearomatization of tryptophols includes a Michael addition reaction and a subsequent ring‐closing iminium ion trapping, furnishing a furoindoline core with a quaternary carbon center.
ChemInform Abstract: A Tunable Route for the Synthesis of Azomethine Imines and β‐Aminocarbonyl Compounds from Alkenes.
Authors: Clavette Christian , Gan Wei , Bongers Amanda , Markiewicz Thomas , Toderian Amy B. , Gorelsky Serge I. , Beauchemin Andre M. 
Published: March 2013

AbstractThis method allows for modular preparation of stable, crystalline azomethines from simple alkenes and hydrazones.
ChemInform Abstract: Samarium Diiodide Mediated Highly Diastereoselective Conjugate Reduction of the α,β‐Unsaturated Ester Moiety in Heterocyclic Compounds.
Authors: Jiang Hui , Na Risong , Zhang Lei , Liu Honglei , Li Zhen , Wang Bo , Guo Hongchao 
Published: March 2013

AbstractThe unsaturated ester (I) is reduced completely diastereoselectively to yield the trans‐isomers (II).
ChemInform Abstract: CuI/SnCl2 Co‐Catalyzed Four‐Component Reaction of Ketones, Amines, Alkynes, and Carbon Dioxide.
Authors: Zhao Jinwu , Huang Huawen , Qi Chaorong , Jiang Huanfeng 
Published: March 2013

AbstractThe title tandem coupling/cycloaddition reaction is a useful tool for the synthesis of 5‐alkylene‐oxazolidinones.
ChemInform Abstract: Tempering the Reactivities of Postulated α‐Oxo Gold Carbenes Using Bidentate Ligands: Implication of Tricoordinated Gold Intermediates and the Development of an Expedient Bimolecular Assembly of 2,4‐Disubstituted Oxazoles.
Authors: Luo Yingdong , Ji Kegong , Li Yuxue , Zhang Liming 
Published: March 2013

AbstractA variety of oxazole derivatives is prepared from terminal alkynes and carboxamides via a gold‐catalyzed oxidation strategy.
ChemInform Abstract: A Mild and Efficient Synthesis of 2‐Oxazolines via Transamidation—Cyclodehydrosulfurization of Thioamides with 2‐Aminoethanol.
Authors: Goud D. Raghavender , Pathak Uma 
Published: March 2013

AbstractThe two‐step approach renders possible the preparation of oxazole derivatives bearing either aromatic or aliphatic substituents at C‐2 and may thus find an application in synthetic and medicinal chemistry.
ChemInform Abstract: Direct Oxidative C—H Arylation of Benzoxazoles with Arylsulfonyl Hydrazides Promoted by Palladium Complexes.
Authors: Yuen On Ying , So Chau Ming , Wong Wing Tak , Kwong Fuk Yee 
Published: March 2013

AbstractThe oxidative protocol for C‐2 arylation of benzoxazoles (I) and (VI) utilizes readily available and easy‐to‐handle arylsulfonyl hydrazides (II) as the aryl sources.
ChemInform Abstract: One‐Pot, Four‐Component Synthesis of Novel Imidazo[2,1‐b]thiazol‐5‐amine Derivatives.
Authors: Mahdavi Mohammad , Asadi Mehdi , Saeedi Mina , Ebrahimi Mostafa , Rasouli Mohammad A. , Ranjbar Parviz R. , Foroumadi Alireza , Shafiee Abbas 
Published: March 2013

AbstractModerate to excellent yields are obtained and no undesired side reactions are observed.
ChemInform Abstract: Asymmetric Addition of Benzothiazole to N‐tert‐Butanesulfinyl Imine for the Synthesis of Chiral α‐Branched Heteroaryl Amines.
Authors: Zhang Jinlong , Yang Yuhong , Wang Mei , Lin Li , Wang Rui 
Published: March 2013

AbstractFreshly generated benzothiazol‐2‐yl potassium [cf.
ChemInform Abstract: Click Chemistry Inspired Structural Modification of Azole Antifungal Agents to Synthesize Novel “Drug Like” Molecules.
Authors: Pericherla Kasiviswanadharaju , Khedar Poonam , Khungar Bharti , Kumar Anil 
Published: March 2013

AbstractOne‐pot azide formation followed by Cu‐catalyzed 1,3‐dipolar cycloaddition to terminal alkynes is the key step in the preparation of 32 triazoles which may have antifungal and antibacterial activity.
ChemInform Abstract: Design and Synthesis of 1H‐1,2,3‐Triazoles Derived from Econazole as Antitubercular Agents.
Authors: Kim Suhyun , Cho Sang‐Nae , Oh Taegwon , Kim Pilho 
Published: March 2013

AbstractThe majority of the triazole compounds is prepared by microwave‐assisted click chemistry.
ChemInform Abstract: A New Method for the Synthesis of 1,5‐Disubstituted 1,2,3‐Triazoles via Triazolium Salt Intermediates.
Authors: Koguchi Shinichi , Izawa Kazuki 
Published: March 2013

AbstractThe process can be conducted under cost‐effective, environmentally friendly conditions in the absence of any toxic reagents or transition‐metal catalysts.
ChemInform Abstract: Tandem Catalysis in Domino Olefin Cross‐Metathesis/Intramolecular Oxa‐Conjugate Cyclization: Concise Synthesis of 2,6‐cis‐Substituted Tetrahydropyran Derivatives.
Authors: Fuwa Haruhiko , Noguchi Takuma , Noto Kenkichi , Sasaki Makoto 
Published: March 2013

AbstractAuto‐tandem as well as orthogonal‐tandem catalysis (OTC) are investigated in the preparation of the title compounds.
ChemInform Abstract: Diastereoselective Synthesis of Substituted Tetrahydropyrans by Copper(II)—Bisphosphine‐Catalyzed Olefin Migration and Prins Cyclization.
Authors: Ghosh Arun K. , Kass Jorden , Nicponski Daniel R. , Keyes Chad 
Published: March 2013

AbstractA mild tandem olefination/Prins cyclization of hex‐5‐en‐1‐ols with a variety of aldehydes in the presence of phosphine ligands (I)‐(III) is developed.
ChemInform Abstract: Enantioselective Synthesis of 2‐Amino‐5,6,7,8‐tetrahydro‐5‐oxo‐4H‐chromene‐3‐carbonitriles Using Squaramide as the Catalyst.
Authors: Gao Yu , Du Da‐Ming 
Published: March 2013

AbstractThe tandem Michael‐addition‐cyclization reaction of cyclohexan‐1,3‐diones (I) and (IV) and benzylidenemalononitriles (II) affords title compounds (III) and (V), resp., in high yields and moderate to good enantioselectivities.
ChemInform Abstract: Zinc Oxide Nanoparticles: A Highly Efficient and Readily Recyclable Catalyst for the Synthesis of Xanthenes.
Authors: Safaei‐Ghomi Javad , Ghasemzadeh Mohammad Ali 
Published: March 2013

AbstractThe reaction of various aromatic aldehydes with 5,5‐dimethyl‐1,3‐cyclohexanedione (I) and 2‐naphthol (IV) proceeds under solvent‐free conditions to afford 1,8‐dioxooctahydroxanthenes (III) and 14‐aryl‐14H‐dibenzo[a,j]xanthenes (V), respectively.
ChemInform Abstract: A Method for the Synthesis of Pyridines from Aldehydes, Alkynes and NH4OAc Involving Rh‐Catalyzed Hydroacylation and N‐Annulation.
Authors: Sim Yong‐Kyun , Lee Hyejeong , Park Jung‐Woo , Kim Dong‐Su , Jun Chul‐Ho 
Published: March 2013

AbstractThe route to the pyridine derivatives includes the hydroacylation reaction of aldehydes with internal or terminal alkynes followed by the annulation with the symmetrical internal alkyne and a nitrogen source.
ChemInform Abstract: Synthesis and Asymmetric Hydrogenation of (3E)‐1‐Benzyl‐3‐ [(2‐oxopyridin‐1(2H)‐yl)methylidene]piperidine‐2,6‐dione.
Authors: Bisset Alexander A. , Shiibashi Akira , Desmond Jasmine L. , Dishington Allan , Jones Teyrnon , Clarkson Guy J. , Ikariya Takao , Wills Martin 
Published: March 2013

AbstractStarting material (I) is prepared from N‐benzylglutarimide in three steps.
ChemInform Abstract: Isolation, Structure, Synthesis and Cytotoxicity of an Unprecedented Flupirtine Dimer.
Authors: Csuk Rene , Sommerwerk Sven , Wiese Jana , Wagner Christoph , Siewert Bianka , Kluge Ralph , Stroehl Dieter 
Published: March 2013

AbstractTitle compound (I), synthesized starting from 2‐amino‐6‐chloro‐3‐nitropyridine, is found to show no cytotoxicity.
ChemInform Abstract: An Unusual Chemoselective Hydrogenation of Quinoline Compounds Using Supported Gold Catalysts.
Authors: Ren Dong , He Lin , Yu Lei , Ding Ran‐Sheng , Liu Yong‐Mei , Cao Yong , He He‐Yong , Fan Kang‐Nian 
Published: March 2013

AbstractIn contrast to established noble metal‐catalyzed reactions in which quinoline and its derivatives tend to act as catalyst poisons, this Au‐catalyzed reaction is promoted by quinolines.
ChemInform Abstract: Synthesis and Characterization of Some New Quinoline Based Derivatives Endowed with Broad Spectrum Antimicrobial Potency.
Authors: Desai Nisheeth C. , Rajpara Kiran M. , Joshi Vivek V. 
Published: March 2013

AbstractTwo novel series of quinoline derivatives substituted with thiazolylpyrazole (V) or pyrimidine moieties (XI) are synthesized (yields not given) and screened for their antimicrobial activities.
ChemInform Abstract: Regio‐ and Enantioselective Synthesis of Functionalized Tetrahydroquinolines by Palladium‐Catalyzed Cyclization of 2‐Amidophenylmalonates with Allylic Bisacetates.
Authors: Yoshida Masahiro , Maeyama Yohei , Shishido Kozo 
Published: March 2013

AbstractDepending on the substituents of the substrate this method yields either 2‐vinyl or 3‐vinyl tetrahydroyquinolines regioselectively.
ChemInform Abstract: Preparation of 4,6‐Diaryl‐3,4‐dihydropyrimidine‐2(1H)‐thiones in an Ionic Liquid.
Authors: Safaei‐Ghomi Javad , Ghasemzadeh Mohammad Ali 
Published: March 2013

AbstractThe present new synthesis of title compounds (III) gives higher yields in shorter reaction times than under conventional heating.
ChemInform Abstract: 1,3‐Dipolar Cycloaddition in a Series of 7‐Oxoalkyl‐1,3,7‐triazapyrenium Salts.
Authors: Borovlev I. V. , Demidov O. P. , Pisarenko S. V. , Nemykina O. A. , Saigakova N. A. 
Published: March 2013

AbstractA series of new 7‐substituted triazapyrenium salts (III) is synthesized, which undergo 1,3‐dipolar cycloaddition reactions with chalcones furnishing previously unknown pyrrolotriazapyrenes [cf.
ChemInform Abstract: Cascade Syntheses of Aza[2,1‐b][1,3]‐benzothiazinone Heteropolycyclic Compounds from Cyclic Thiourea Catalyzed by Cu(I).
Authors: Chen Dingben , Wu Jiashou , Yang Jianguo , Huang Ling , Xiang Yubo , Bao Weiliang 
Published: March 2013

AbstractPreliminary investigations with ester (I) and the corresponding carboxylic acid reveal that the yield is significantly decreased in the latter case.
ChemInform Abstract: A Green One‐Pot Synthesis of N‐Alkyl‐2‐(2‐oxoazepan‐1‐yl)‐2‐arylacetamide Derivatives via an Ugi Four‐Center, Three‐Component Reaction in Water.
Authors: Rasouli Mohammad Ali , Mahdavi Mohammad , Ranjbar Parviz Rashidi , Saeedi Mina , Shafiee Abbas , Foroumadi Alireza 
Published: March 2013

AbstractThe highly functionalized heterocyclic system is readily available in the absence of any catalyst.
ChemInform Abstract: A Synthetic Pathway to the 1,4‐Dihydro‐2H‐3‐benzoxocine System from Morita—Baylis—Hillman Cinnamyl Alcohols with 2,5‐Dimethoxy‐2,5‐dihydrofuran via the Heck Reaction.
Authors: Ahn Sang‐Hyun , Kim Young Keun , Hyun Jina , Lee Kee‐Jung 
Published: March 2013

AbstractHeck reaction of the precursor alcohols (III) with dihydrofuran (IV) represents the key step in the preparation of target compounds (V).
ChemInform Abstract: Epoxy Ether Cleaving Reactions Catalyzed by Supporting Lewis Acidic Ionic Liquid.
Authors: Zhi Hui Zhen , Shi Hong Li , Hu Yun , Xia Ke Dan , Zhang Peng , Yang Jin Fei 
Published: March 2013

AbstractSupported Et3NH+Cl proves to be the best catalyst from the economical point of view and its reusability for at least 7 cycles.
ChemInform Abstract: Ethylene Glycol as Hydrogen Donor for the Syntheses of Thymol Analogues via Hydrolysis of 4‐Methylcoumarins.
Authors: Chang Junbiao , Wang Shuyang , Shen Zhenhua , Huang Gang , Zhang Yueteng , Zhao Jing , Li Changwei , Fan Fangfang , Song Chuanjun 
Published: March 2013

AbstractThymol structures are required for pharmaceutical studies.
ChemInform Abstract: Two New Stilbenoids from Cajanus cajan.
Authors: Zhang Nen‐Ling , Zhu Yue‐Hui , Huang Ri‐Ming , Fu Man‐Qin , Su Zhi‐Wei , Cai Jia‐Zhong , Hu Ying‐Jie , Qiu Sheng‐Xiang 
Published: March 2013

AbstractCajanotone (I) and cajanamide A (II) are isolated from the leaves of title pea along with ten known stilbenoids and flavones.
ChemInform Abstract: Cyclo‐Release Strategy in Solid‐Phase Combinatorial Synthesis of Heterocyclic Skeletons
Authors: Mishra Bhuwan B. , Kumar Dhananjay , Mishra Amrita , Mohapatra Prabhu P. , Tiwari Vinod K. 
Published: March 2013

AbstractReview: ca. 120 refs.
ChemInform Abstract: Peptide‐Based Selective Inhibitors of Matrix Metalloproteinase‐Mediated Activities
Authors: Ndinguri Margaret W. , Bhowmick Manishabrata , Tokmina‐Roszyk Dorota , Robichaud Trista K. , Fields Gregg B. 
Published: March 2013

AbstractReview: 100 refs.
ChemInform Abstract: Azide‐Alkyne Huisgen [3 + 2] Cycloaddition Using CuO Nanoparticles
Authors: Woo Hyunje , Kang Hyuntae , Kim Aram , Jang Seongwan , Park Ji Chan , Park Sungkyun , Kim Byeong‐Su , Song Hyunjoon , Park Kang Hyun 
Published: March 2013

AbstractReview: 47 refs.
A Facile Removal of Phenol in Wastewater Using Crosslinked β‐Cyclodextrin Particles with Ultrasonic Treatment
Authors: Wang Haijun , Wang Youtao , Zhou Yuqing , Han Pingfang , Lü Xiaoping 
Published: March 2013

AbstractA crosslinked β‐cyclodextrin polymer (β‐CD‐MDI), synthesized by the modification of β‐cyclodextrin (β‐CD) with crosslinking reagent diphenyl methane diisocyanate (MDI), was prepared and used as an adsorbent in the treatment of phenol wastewater ultrasonic aided. An infrared spectroscopy test was conducted to characterize β‐CD‐MDI. The adsorption capacity of phenol in wastewater was determined by assessing the corresponding parameters, such as the amount of adsorbent β‐CD‐MDI, the initial concentration of phenol, the influence of pH and ultrasonic intensity. The adsorption efficiency of β‐CD‐MDI is up to 87.3% with an amount of crosslinked polymer of 40 g/L, an initial phenol concentration of 100 mg/L and a wastewater pH of 6. The application of ultrasound can facilitate the purification of wastewater and reduce the adsorption time remarkably.
Dose Linearity of Glimepiride in Healthy Human Egyptian Volunteers
Authors: Helmy Sally A. , El Bedaiwy Heba M. , Mansour Noha O. 
Published: March 2013

AbstractThe present study was adopted to evaluate the pharmacokinetics and dose linearity of glimepiride after administration of single oral doses of 1–6 mg glimepiride in an open‐label, five‐way crossover study. Twenty‐four healthy male Egyptian volunteers were given 1, 2, 3, 4, and 6 mg of glimepiride on five occasions, and blood samples were collected over 24 hours. Plasma glimepiride concentrations were assayed by a validated reversed‐phase high‐performance liquid chromatography method with UV detection and the data were evaluated by non‐compartmental methods to determine pharmacokinetic parameters. The mean elimination half‐lives (t1/2) did not vary with the dose. The peak plasma levels (Cmax) and area under the plasma level versus time curve (AUC) data showed dose‐proportional response. The time to peak plasma concentration (tmax), mean residence time, oral clearance (Cl/F) and apparent volume of distribution (Vd/F) were all similar regardless of the administered dose (P > .05). The 90% confidence intervals of the ratios of dose‐adjusted log transformed values of Cmax, AUC0–t, AUC0–∞, t1/2, and tmax fell within the range of 80–125%. These findings suggest that glimepiride disposition is linear over the dose range studied healthy human Egyptian volunteers.
An adaptive power pricing scheme for improved fairness in energy‐constrained cooperative networks
Authors: Cui H. , Yu Y. , Zhong Q. , Zhang H. 
Published: March 2013

SUMMARYThis paper presents an adaptive power pricing scheme to address the fairness issue with relay selection and power allocation in decode‐and‐forward‐based opportunistic relaying networks, which is focused on the scenario where a distributed energy‐constrained cooperative communication system is employed over Rayleigh fading channels. Specifically, the proposed scheme is conducted analytically by obtaining the mathematical expression for the symbol error probability using the statistical characteristic of the signal‐to‐noise ratio, and it also takes the residual energy of nodes into consideration. Numerical results show that the proposed scheme has the advantage of better system reliability and further improves the throughput of the whole network compared with previous algorithms without considering fairness. Copyright © 2013 John Wiley & Sons, Ltd.
Livestock stations as foci of groundwater recharge and nitrate leaching in a sandy desert of the Central Monte, Argentina
Authors: Meglioli Pablo A. , Aranibar Julieta N. , Villagra Pablo E. , Alvarez Juan A. , Jobbágy Esteban G. 
Published: March 2013

ABSTRACTIn arid ecosystems, evapotranspiration generally exceeds precipitation, preventing deep drainage and groundwater recharge. We propose that vegetation changes associated with the establishment of pastoralist settlements (i.e. livestock stations) can disrupt the ecological and hydrological linkages in arid groundwater‐coupled ecosystems of the Monte desert (Argentina), allowing local groundwater recharge and nitrate leaching to the aquifer, affecting groundwater quality. We tested this hypothesis by analysing vegetation, land use indicators, water and nitrate dynamics in three pairs of livestock stations and relatively undisturbed control woodlands. Livestock stations had lower vegetation and dead wood but higher dung covers than control woodlands, indicating soil and vegetation changes associated to land use. Water and nitrate dynamics were also affected by land use. Soil nitrate and water contents sampled down to the water table were higher, and soil chloride and salinity were lower in livestock stations, indicating higher water percolation and N input/transport rates. Higher groundwater nitrate concentrations in livestock stations indicate that these areas behave as foci of N and water export from ecosystems to the phreatic aquifer. Our study supports the idea that vegetation in arid areas prevents downward surface–groundwater interactions, but it also indicates that human modifications of vegetation disrupt this control, reducing soil water consumption and allowing vertical movement of water and solutes to the aquifer, which can modify groundwater quality. Disruptions of ecological processes by livestock activities clearly affect the hydrological links between surface and groundwater. Copyright © 2013 John Wiley & Sons, Ltd.