bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nickel(I)‐Komplexe mit 1,1′‐Bis(phosphino)ferrocenen als Liganden
Authors: Langer Jens , Fischer Reinald , Görls Helmar , Theyssen Nils , Walther Dirk 
Published: March 2007

AbstractNickel(I) Complexes with 1,1′‐Bis(phosphino)ferrocenes as LigandsThe thermically stable monomeric Nickel(I) complexes [(dtbpf)Ni(acac)] (1) and [(dippf)NiCl] (2) were synthesized and characterized by elemental analyses, EPR spectroscopy, and by X‐ray crystal structure analyses of single crystals (dtbpf: 1,1′‐bis(di‐tertbutylphosphino)ferrocene; dippf: 1,1′‐bis(diisopropylphosphino)ferrocene). 1 is formed by reduction of Ni(acac)2 with triethylaluminium in the presence of dtbpf, together with the nickel(0) complex [(dtbpf)Ni(C2H4)]. 1 contains a NiI atom surrounded of two O‐ and two P donor atoms in a distorted tetrahedral coordination. 2 was obtained by reduction of [(dippf)NiCl2] with NaBH4. In 2 the nickel(I) atom adopts trigonal planar coordination.
Synthese, Struktur, Elektrochemie und optische Eigenschaften von alkinylfunktionalisierten 1,3,2‐Diazaborolen und 1,3,2‐Diazaborolidinen
Authors: Weber L. , Penner A. , Domke I. , Stammler H.‐G. , Neumann B. 
Published: March 2007

AbstractSyntheses, Structures, Electrochemistry and Optical Properties of Alkyne‐Functionalized 1,3,2‐Diazaboroles and 1,3,2‐DiazaborolidenesThe reaction of 2‐bromo‐1,3‐ditert‐butyl‐2,3‐dihydro‐1H‐1,3,2‐diazaborole (3) with lithiated tert‐butyl‐acetylene and lithiated phenylacetylene affords the 2‐alkynyl‐functionalized 1,3,2‐diazaboroles 4 and 5 as a thermolabile colorless oil (4) or a solid (5). Similarly 2‐bromo‐1,3‐diethyl‐2,3‐dihydro‐1H‐1,3,2‐benzodiazaborole (6) was converted into the crystalline 2‐alkynyl‐benzo‐1,3,2‐diazaboroles 7 and 8 by treatment with LiC≡C–tBu or LiC≡CPh, respectively. 2‐Ethynyl‐1,3‐ditert‐butyl‐2,3‐dihydro‐1H‐1,3,2‐diazaborole (2) was metalated with tert‐butyl‐lithium and subsequently coupled with 2‐bromo‐1,3,‐ditert‐butyl‐2,3‐dihydro‐1H‐1,3,2‐diazaborole (3) to afford bis(1,3‐ditert‐butyl‐2,3‐dihydro‐1H‐1,3,2‐diazaborol‐2‐yl)acetylene (9) as thermolabile colorless crystals. Analogously coupling of the lithiated species with 6 or with 2‐bromo‐1,3‐ditert‐butyl‐1,3,2‐diazaborolidine (11) gave the unsymmetrically substituted acetylenes 10 or 12, respectively, as colorless solids. Compounds 4, 5, 7–10 and 12 are characterized by elemental analyses and spectroscopy (IR, 1H‐, 11B{1H}, 13C{1H}‐NMR, MS). The molecular structures of 5, 8 and 9 were elucidated by X‐ray diffraction analyses.
Preparation and Crystal Structures of Ruthenium and Osmium Oxide Tetrahalides
Authors: Shorafa Hashem , Seppelt Konrad 
Published: March 2007

AbstractRuOF4 as the highest valence oxide fluoride exist as a molecular compound (a = 606.0(1), b = 836.1(1), c = 626.3(1) pm, β = 91.637(3), Z = 4; P21/n) as well as fluorine bridged polymer (a = 547.7(2), b = 928.5(3), c = 1252.4(3) pm, Z = 8, P212121). A reproducible method for pure, deep blue OsOF4 is given. Pure OsOF4‐I is isostructural to the fluorine bridged polymeric RuOF4 (a = 554.6(1), b = 955.4(2), c = 1278.4(2), Z = 8, P212121). OsOF4‐II is also a fluorine bridged polymer (a = 537.8(2), b = 1274.8(4), c = 555.2(2), β = 117.716(6)°, Z = 4, P21/c). OsOCl4 again is a molecular species (a = 938.9(2), b = 561.3(1), c = 1192.0(2), β = 109.944(4)°, Z = 4, P21/c).
Das reduzierte Nitridosilicat BaSi6N8
Authors: Stadler Florian , Schnick Wolfgang 
Published: March 2007

AbstractThe Reduced Nitridosilicate BaSi6N8The reduced nitridosilicate BaSi6N8has been synthesized starting from barium nitride and silicon diimide in a radio‐frequency furnace at temperatures of about 1650 °C. The structure has been determined from X‐ray powder diffraction data and was refined by the Rietveld method (Imm2 (no. 44),a= 793.16(1),b= 934.37(2),c= 483.57(1) pm,V= 358.38(1) ·106pm3,Z= 2,wRp= 0.0353,Rp= 0.0238,RF2= 0.0660, 452 observed reflections, 42 parameters). BaSi6N8crystallizes isotypically with SrSi6N8. The three‐dimensional Si‐N‐network consists of corner‐sharing SiN4tetrahedra and single bonds Si‐Si forming N3Si‐SiN3building units.29Si solid‐state NMR spectra of BaSi6N8resemble those of SrSi6N8exhibiting two resonances at δ = −54.3 and −28.0 ppm. Their observed intensity ratio of approximately 2 : 1 can be attributed to theSiN4tetrahedra and theSi2N6units, respectively. This observation is in accordance with the results from the X‐ray structure determination (Si at Wyckoff positions 8e(SiN4) and 4d(Si2N6)).
Polyfluoroorganoboron‐Oxygen Compounds. 5 Feasible Routes to Perfluoroalkyltrimethoxyborates M[CnF2n+1B(OMe)3] (n ≥ 3)
Authors: Adonin Nicolay Yu. , Bardin Vadim V. , Frohn Hermann‐Josef 
Published: March 2007

AbstractA well applicable preparative method for lithium perfluoroalkyltrimethoxyborates, Li[CnF2n+1B(OMe)3] (n = 3, 4, 6), was elaborated which is based on the reaction of B(OMe)3 with CnF2n+1Li generated from CnF2n+1H and t‐BuLi. Alternative perfluoroalkylation reactions of B(OMe)3 with perfluoropropyllithium generated from C3F7I and RLi, perfluoropropylmagnesium bromide, or perfluoropropyltrimethylsilane and potassium fluoride gave less satisfactory results for M[C3F7B(OMe)3]. The conversion of M[CnF2n+1B(OMe)3] salts (M = Li, BrMg) into K[CnF2n+1B(OMe)3] salts and basic properties of the new salts are reported.
O‐Triorganosilyl Carbamoselenoates – Synthesis and Reactions
Authors: Ibi Kazumasa , Kawai Kohji , Kato Shinzi , Ando Fumio , Koketsu Jugo 
Published: March 2007

AbstractA series of O‐triorganosilyl carbamoselenoates were isolated in good yields from the reaction of sodium or potassium carbamoselenoates with triorganosilyl chlorides. The O‐silyl carbamoselenoates readily reacted with RbF and CsF and with organo‐germanium, ‐tin, and ‐lead halides and gave the corresponding heavy alkali metal and Se‐substituted Group 14 organometal and carbamoselenoates in moderate to good yields.
Synthesis and some Reactions of Alkali Metal Carbamotelluroates
Authors: Ibi Kazumasa , Imase Tomohiro , Kato Shinzi , Ando Fumio , Koketsu Jugo 
Published: March 2007

AbstractSodium and potassium carbamotelluroates [M(R2NCOTe), M = Na, K, Rb, Cs] were synthesized in moderate to good yields by reacting carbamoyl chloride with the corresponding alkali metal tellurides. The salts readily reacted with trimethylsilyl chloride to form O‐trimethylsilyl carbamotelluroate (R2NCTeOSiMe3), which further reacted with RbF and CsF to lead to the corresponding heavy alkali metal carbamotelluroates. These salts reacted with alkyl iodide and carbamoyl chlorides to give the corresponding Te‐alkyl carbamotelluroates and dicarbamoyl tellurides in moderate yields.
The Structure of Tetrakis(pentafluorophenyl)tellurium(IV), Te(C6F5)4
Authors: Naumann Dieter , Tyrra Wieland , Fischer Hendrik T. M. , Kremer Silke 
Published: March 2007

AbstractTetrakis(pentafluorophenyl)tellurium(IV), Te(C6F5)4, was prepared from the reaction of TeCl4 and Mg(C6F5)Br. Crystallization of the crude product from n‐pentane at −25 °C gave suitable single crystals. The title compound crystallizes in the monoclinic space group P21/c (Z = 8) with two independent molecules per unit cell.
Solvothermal Synthesis and Structures of Lamellar [Mn(tren)2]Cl2 and the Dimeric and Polymeric Hexaselenidomanganese(II) Complexes [{Mn(Se6)(tren)}2] and $^{2}_{\infty}\rm [\{Mn(Se_{6})(tren)\}]$
Authors: Kromm Anna , Sheldrick William S. 
Published: March 2007

AbstractReaction of [MnCl2(tren)] with tren (tris‐(2‐aminoethyl)amine) affords the coordination polymer $^{2}_{\infty}\rm [Mn(tren)_{2}]Cl_{2}$ (1), in which the primary amino groups of tridentate tren ligands connect [(tren)Mn]2+ fragments into a pseudo 63 network. The Mn atoms exhibit a capped octahedral environment with the tertiary N atom of the second tetradentate tren ligand in the capping position. Treatment of MnCl2 with Se at 1:2 molar ratio in H2O/tren (10:1) at 150 °C leads to formation of the dinuclear complex [{Mn(μ‐Se6)(tren)}2] (2), which contains tetradentate tren ligands and two bridging hexaselenide ligands in the 1κSe1 : 2κSe6 mode. In contrast, reaction of [MnCl2(tren)] with Se at a 1:6 molar ratio under similar sovothermal conditions affords the isomeric coordination polymer $^{2}_{\infty}\rm [Mn(\mu-Se_{6})(tren)]$ (3). In this complex, Se62− anions now bridge [(tren)Mn]2+ fragments into chains, that themselves are linked into polymeric sheets through one of the primary amino groups of the tetradentate tren ligands.
A New Two‐Dimensional Coordination Polymer of Mercury(II) with very High Thermal Stability
Authors: Mahmoudi Ghodrat , Morsali Ali , Zhu Long‐Guan 
Published: March 2007

AbstractA 2D HgII coordination polymer containing ligands 1,2,4‐triazole (Htrz) and thiocyanate, [Hg(μ3‐trz)(SCN)]n (1) has been synthesized and characterized by elemental analysis and IR spectroscopy. The single‐crystal X‐ray data show the coordination number of Hg atoms is four and the ligand trz− acts as a three‐fold donor. The thermal stability of compound 1 was studied by thermal gravimetric and differential thermal analyses. The composition and formation of the complex in methanol solution were found to be in support of its solid state structure.
Relationship Between Apolipoprotein Concentrations and HDL Subclasses Distribution
Authors: Tian Li , Fu Mingde , Jia Lianqun , Xu Yanhua , Long Shiyin , Tian Haoming , Tian Ying 
Published: March 2007

AbstractAlterations in plasma apolipoproteins levels can influence the composition, content, and distribution of plasma lipoproteins that affect the risk of atherosclerosis. This study assessed the relationship between plasma apolipoproteins levels, mainly apoAI, and HDL subclass distribution. The contents of plasma HDL subclasses were determined by two‐dimensional gel electrophoresis coupled with immunodetection in 545 Chinese subjects. Compared with a low apoAI group, the contents of all HDL subclasses increased significantly both in middle and high apoAI group, and the contents of large‐sized HDL2b increased more significantly relative to those of small‐sized preβ1‐HDL in a high apoAI group. When apoAI and HDL‐C levels increased simultaneously, in comparison to a low apoAI along with HDL‐C concentration group, a significant increase (116%) was shown in HDL2b but only a slight increase (26%) in preβ1‐HDL. In addition, Pearson correlation analysis revealed that apoAI levels were positively and significantly correlated with all HDL subclasses. Multiple liner regression demonstrated that the apoAI concentrations were the most powerful predictor for HDL subclass distribution. With the elevation of apoAI concentrations, the contents of all HDL subclasses increased successively and significantly, especially, an increase in large‐sized HDL2b. Further, when apoAI and HDL‐C concentrations increased simultaneously, the shift to larger HDL size was more obvious. Which, in turn, indicated that HDL maturation might be enhanced and, the reverse cholesterol transport might be strengthened along with apoAI levels which might be a more powerful factor influencing the distribution of HDL subclasses.
Bringing home the right to food in Canada: challenges and possibilities for achieving food security
Authors: Rideout Karen , Riches Graham , Ostry Aleck , Buckingham Don , MacRae Rod 
Published: March 2007

AbstractWe offer a critique of Canada's approach to domestic food security with respect to international agreements, justiciability and case law, the breakdown of the public safety net, the institutionalisation of charitable approaches to food insecurity, and the need for ‘joined-up’ food and nutrition policies. We examined Canada's commitments to the right to food, as well as Canadian policies, case law and social trends, in order to assess Canada's performance with respect to the human right to food. We found that while Canada has been a leader in signing international human rights agreements, including those relating to the right to food, domestic action has lagged and food insecurity increased. We provide recommendations for policy changes that could deal with complex issues of state accountability, social safety nets and vulnerable populations, and joined-up policy frameworks that could help realise the right to adequate food in Canada and other developed nations.
Association of body mass index and dietary restraint with changes in eating behaviour throughout late childhood and early adolescence: a 5-year study
Authors: Bisset Sherri , Gauvin Lise , Potvin Louise , Paradis Gilles 
Published: March 2007

AbstractObjectivesTo describe patterns of dietary behaviours specific to low quality snacking, fruit and vegetable, and fast food consumption during the transition from childhood to adolescence and to examine how these behaviours are associated with tendencies towards dietary restraint and the occurrence of overweight and obesity in mid-adolescence.DesignA 5-year follow-up of self-reported eating. Hierarchical linear modelling was utilised to explore the relationship between dietary changes and body mass index (BMI) and dietary restraint while controlling for physical activity and smoking.SettingThe sample was derived from students participating in the Quebec Heart Health Demonstration Project, and represents rural, suburban and inner city youths.SubjectsA sample of 561 girls and 627 boys in the fourth, sixth, seventh and ninth grades.ResultsOverall the sample was characterised by a decrease in fruit and vegetable consumption and increase in low quality snacking, and a decrease in fast food consumption over the 5-year follow-up. Dietary restraint and BMI were found to be associated with dietary behaviour. Lower than average dietary restraint was associated with a lower frequency of fast food consumption and greater increase in low quality snacking over the 5-year period. Higher than average dietary restraint was associated with lesser frequency of low quality snacking at baseline. Having a BMI in the obese range was associated with more frequent fast food consumption in the fourth grade and a more rapid drop in fast food consumption across the 5-year period.ConclusionsDietary behaviours are associated with the psychological construct dietary restraint and with weight status in this population of adolescents.
The effects of dietary advice and vouchers on the intake of fruit and fruit juice by pregnant women in a deprived area: a controlled trial
Authors: Burr ML , Trembeth J , Jones KB , Geen J , Lynch LA , Roberts ZES 
Published: March 2007

AbstractObjectiveTo examine the effectiveness of two methods of increasing fruit and fruit juice intake in pregnancy: midwives' advice and vouchers exchangeable for juice.DesignPregnant women were randomly allocated to three groups: a control group, who received usual care; an advice group, given advice and leaflets promoting fruit and fruit juice consumption; and a voucher group, given vouchers exchangeable for fruit juice from a milk delivery firm. Dietary questionnaires were administered at ~16, 20 and 32 weeks of pregnancy. Serum β-carotene was measured at 16 and 32 weeks.SettingAn antenatal clinic in a deprived area.SubjectsPregnant women aged 17 years and over.ResultsThe study comprised 190 women. Frequency of fruit consumption declined during pregnancy in all groups, but that of fruit juice increased substantially in the voucher group. Serum β-carotene concentration increased in the voucher group, from 106.2 to 141.8 μmol l− 1in women with measurements on both occasions (P = 0.003), decreased from 120.0 to 99.8 μmol l− 1in the control group (P = 0.005), and was unchanged in the advice group.ConclusionsPregnant women drink more fruit juice if they receive vouchers exchangeable for juice supplied by the milk delivery service. Midwives' advice to eat more fruit has no great effect. Providing vouchers for fruit juice is a simple method of increasing its intake in a deprived population and may be useful for other sections of the community.
What young Dutch adults say they do to keep from gaining weight: self-reported prevalence of overeating, compensatory behaviours and specific weight control behaviours
Authors: Wammes B , French S , Brug J 
Published: March 2007

AbstractObjectiveThe aim of this study was to explore the prevalence of and differences in self-reported occasions of overeating (such as at celebrations and other parties), compensatory behaviours and specific weight gain prevention strategies among young Dutch adults according to sociodemographics and overweight status.Design and subjectsCross-sectional data were analysed from Dutch adults aged 20–40 years, recruited from an Internet research panel (n = 857, response rate = 76.6%). Using electronic questionnaires, self-report data were collected on sociodemographics, body mass index (BMI), occasions of overeating, compensatory behaviours, and diet and physical activity used as weight gain prevention strategies. Associations were tested using multiple linear and logistic regression analyses.ResultsOf the participants, 48.6% reported occasions of overeating at least once a week during the 4-week period, 44.6% reported compensating for these occasions and 72.9% reported engaging in dietary and physical activities specifically for weight gain prevention purposes. Only 32.1% of the respondents reported using the recommended combination of diet and physical activity as a weight gain prevention strategy. In addition, results showed that overweight people (BMI ≥ 25 kg m-2) and women were more likely to report overeating than people with healthy body weights (odds ratio (OR) = 1.79; 95% confidence interval (CI) 1.32–2.42) and men (OR = 1.50; 95% CI 1.14–1.97). Overweight people, women and people who regularly reported overeating were also significantly more likely to report compensatory behaviours by eating less and to report specific weight gain prevention strategies using diet and physical activity.ConclusionThe present study suggests that people experience frequent occasions of overeating and try to compensate for such occasions in different ways. However, the combination of dietary changes and physical activity recommended by experts was seldom reported.
Correction [to “Hydrology's efforts toward the cyberfrontier,”]
Authors: Anonymous  
Published: March 2007

In the 3 January 2006 issue (Eos, 87 (1), 2006), two lines of one article appear in an adjoining article.In “Hydrology's Efforts Toward the Cyberfrontier,” by Christina Bandaragoda et al.,the article's concluding paragraphs on page 6 are: The HIS should include the capability to interact with other software tools, but which ones? Survey responses show that in hydrologic research,FORTRAN is the most popular programming language, Microsoft Excel is most used for data management, and Matlab is most used for mathematics and statistics work.
Rapid export of organic matter to the Mississippi Canyon
Authors: Bianchi Thomas S. , Allison Mead A. , Canuel Elizabeth A. , Corbett D. Reide , McKee Brent A. , Sampere Troy P. , Wakeham Stuart G. , Waterson Elizabeth 
Published: March 2007

Coastal margins, where rivers serve as the dominant control on productivity and delivery of dissolved and particulate materials, have been understudied.The potential importance of certain river‐dominated margins (RiOMars), such as those of the Mississippi River plume, to the global carbon budget is garnering increased attention because of their disproportionate role in transporting terrigenous materials to the ocean [Dagg et al., 2004; McKee et al., 2004].This study concludes that labile (readily open to chemical, physical, or biological change) sedimentary organic matter, produced by in situ diatom production in the Mississippi River plume, is rapidly transported to the Mississippi Canyon. Despite the notion that canyon sediments are typically unstable and lack adequate food resources to support significant macrobenthic communities, this study suggests that productive RiOMars are important conduits for transporting fixed carbon from highly productive plume waters on the shelf to deeper benthic communities.
The first accurate description of an aurora
Authors: Schröder Wilfried 
Published: March 2007

As technology has advanced, the scientific study of auroral phenomena has increased by leaps and bounds. A look back at the earliest descriptions of aurorae offers an interesting look into how medieval scholars viewed the subjects that we study.Although there are earlier fragmentary references in the literature, the first accurate description of the aurora borealis appears to be that published by the German Catholic scholar Konrad von Megenberg (1309–1374) in his book Das Buch der Natur (The Book of Nature). The book was written between 1349 and 1350.
NASA's plans for Moon base
Authors: Zielinski Sarah 
Published: March 2007

As part of NASA's Global Exploration Strategy, the agency announced on 4 December that the United States will begin sending astronauts to the Moon again in around 2020 and plans to establish a permanent base there sometime around 2024. However, the agency has yet to determine key details of the plan, including cost and what science will be conducted.Scott Horowitz, associate administrator for NASA's Exploration Systems Mission Directorate, said, “A lunar base will be the central theme in our…plan for going back to the Moon in preparation for going to Mars and beyond.”
De novopeptide sequencing using ion peak intensity and amino acid cleavage intensity ratio
Authors: Kanazawa Mitsuhiro , Anyoji Hisae , Ogiwara Atsushi , Nagashima Umpei 
Published: March 2007

AbstractMotivation: Peptide-sequencing methods by mass spectrum use the following two approaches: database searching and de novo sequencing. The database-searching approach is convenient; however, in cases wherein the corresponding sequences are not included in the databases, the exact identification is difficult. On the other hand, in the case of de novo sequencing, no preliminary information is necessary; however, continuous amino acid sequence peaks and the differentiation of these peaks are required. It is, however, very difficult to obtain and differentiate the peaks of all amino acids by using an actual spectrum.We propose a novel de novo sequencing approach using not only mass-to-charge ratio but also ion peak intensity and amino acid cleavage intensity ratio (CIR).Results: Our method compensates for any undetectable amino acid peak intervals by estimating the amino acid set and the probability of peak expression based on amino acid CIR. It provides more accurate identification of sequences than the existing methods, by which it is usually difficult to sequence.Contact: kanazawa@reifycs.com
AMPer: a database and an automated discovery tool for antimicrobial peptides
Authors: Fjell Christopher D. , Hancock Robert E.W. , Cherkasov Artem 
Published: March 2007

AbstractMotivation: Increasing antibiotics resistance in human pathogens represents a pressing public health issue worldwide for which novel antibiotic therapies based on antimicrobial peptides (AMPs) may offer one possible solution. In the current study, we utilized publicly available data on AMPs to construct hidden Markov models (HMMs) that enable recognition of individual classes of antimicrobials peptides (such as defensins, cathelicidins, cecropins, etc.) with up to 99% accuracy and can be used for discovering novel AMP candidates.Results: HMM models for both mature peptides and propeptides were constructed. A total of 146 models for mature peptides and 40 for propeptides have been developed for individual AMP classes. These were created by clustering and analyzing AMP sequences available in the public sources and by consequent iterative scanning of the Swiss-Prot database for previously unknown gene-coded AMPs. As a result, an additional 229 additional AMPs have been identified from Swiss-Prot, and all but 34 could be associated with known antimicrobial activities according to the literature. The final set of 1045 mature peptides and 253 propeptides have been organized into the open-source AMPer database.Availability: The developed HMM-based tools and AMP sequences can be accessed through the AMPer resource at http://www.cnbi2.com/cgi-bin/amp.plContact: cfjell@interchange.ubc.caSupplementary information: Supplementary data are available at Bioinformatics online.