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Showing 1 to 12 of 162 entries
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Light dependence of sexual agglutinability in Chlamydomonas eugametos.

Planta

Kooijman R, Elzenga TJ, de Wildt P, Musgrave A, Schuring F, van den Ende H.
PMID: 24232649
Planta. 1986 Nov;169(3):370-8. doi: 10.1007/BF00392133.

The mating activity of mating-type plus gametes of Chlamydomonas eugametos depends on light. Cells lost their ability to agglutinate with mating-type minus gametes after a dark period of 30 min. They regained their agglutinability after 10 min exposure to...

Association of MRS-Based Vertebral Bone Marrow Fat Fraction with Bone Strength in a Human In Vitro Model.

Journal of osteoporosis

Karampinos DC, Ruschke S, Gordijenko O, Grande Garcia E, Kooijman H, Burgkart R, Rummeny EJ, Bauer JS, Baum T.
PMID: 25969766
J Osteoporos. 2015;2015:152349. doi: 10.1155/2015/152349. Epub 2015 Apr 19.

Bone marrow adiposity has recently gained attention due to its association with bone loss pathophysiology. In this study, ten vertebrae were harvested from fresh human cadavers. Trabecular BMD and microstructure parameters were extracted from MDCT. Bone marrow fat fractions...

Impact of Coagulant and Flocculant Addition to an Anaerobic Dynamic Membrane Bioreactor (AnDMBR) Treating Waste-Activated Sludge.

Membranes

Kooijman G, Lopes W, Zhou Z, Guo H, de Kreuk M, Spanjers H, van Lier J.
PMID: 28333092
Membranes (Basel). 2017 Mar 23;7(2). doi: 10.3390/membranes7020018.

In this work, we investigated the effects of flocculation aid (FA) addition to an anaerobic dynamic membrane bioreactor (AnDMBR) (7 L, 35 °C) treating waste-activated sludge (WAS). The experiment consisted of three distinct periods. In period 1 (day 1-86),...

Dithiacrown Ether Substituted Porphyrazines: Synthesis, Single-Crystal Structure, and Control of Aggregation in Solution by Complexation of Transition-Metal Ions.

Inorganic chemistry

van Nostrum CF, Benneker FB, Brussaard H, Kooijman H, Veldman N, Spek AL, Schoonman J, Feiters MC, Nolte RJ.
PMID: 11666270
Inorg Chem. 1996 Feb 14;35(4):959-969. doi: 10.1021/ic950704n.

The synthesis of novel magnesium, copper, and metal-free porphyrazines, peripherally substituted with dithia-7-crown-2 (MPz(7)), dithia-15-crown-5 (MPz(15)), and dithia-18-crown-6 (MPz(18)) macrocycles is reported. These compounds are prepared starting from dicyanoethylene containing crown ethers 3, 2(1), and 2(2), respectively, which contain...

Monodentate sigma-N and Bidentate sigma-N,sigma-N' Coordination of 1,1-Bis((N-p-tolylimino)diphenylphosphoranyl)ethane, CHCH(3)(PPh(2)=NC(6)H(4)-4-CH(3))(2), to Platinum(II).

Inorganic chemistry

Avis MW, Elsevier CJ, Veldman N, Kooijman H, Spek AL.
PMID: 11666367
Inorg Chem. 1996 Mar 13;35(6):1518-1528. doi: 10.1021/ic950748w.

The new ligand, 1,1-bis((N-p-tolylimino)diphenylphosphoranyl)ethane (1,1-BIPE), 1, has been synthesized by means of a Staudinger reaction of 1,1-bis(diphenylphosphino)ethane (1,1-dppe) with 2 equiv of p-tolylazide. Bridge-splitting reactions of Pt(2)Cl(4)(PR(3))(2) with 1 readily afforded sigma-N monodentate complexes, [PtCl(2)(PR(3)){1,1-BIPE-sigmaN}] (2a, PR(3) = PEt(3);...

Hydrogen-Bonded Complexes of Diaminopyridines and Diaminotriazines: Opposite Effect of Acylation on Complex Stabilities.

The Journal of organic chemistry

Beijer FH, Sijbesma RP, Vekemans JA, Meijer EW, Kooijman H, Spek AL.
PMID: 11667479
J Org Chem. 1996 Sep 06;61(18):6371-6380. doi: 10.1021/jo960612v.

The association behavior of several 2,4-diamino-s-triazines, 2,6-diaminopyridines, and their acylated derivatives with uracil derivatives was studied. In solution (1)H-NMR and IR spectroscopy were used, and in the solid state as (co)crystals X-ray diffraction was used. Acylation of 2,6-diaminopyridine leads...

Ladderlike oligomers; intramolecular hydrogen bonding, push-pull character, and electron affinity.

Chemistry (Weinheim an der Bergstrasse, Germany)

Pieterse K, Vekemans JA, Kooijman H, Spek AL, Meijer EW.
PMID: 11192093
Chemistry. 2000 Dec 15;6(24):4597-603. doi: 10.1002/1521-3765(20001215)6:24<4597::aid-chem4597>3.0.co;2-4.

Symmetrical 2,5-bis(2-aminophenyl)pyrazines have been synthesized by application of the Stille coupling strategy. These cotrimers feature three important properties, namely strong intramolecular hydrogen bonding, push-pull character, and high electron affinity. The presence of intramolecular hydrogen bonds has been confirmed by...

X-ray crystal structures and conformational analysis of bicyclo[5.3.1]undec-1(11)-enes: twisting versus pyradidalization in anti-bredt olefins.

The Journal of organic chemistry

Wijsman GW, Iglesias GA, de Wolf WH, Beekman MC, Bickelhaupt F, Kooijman H, Spek AL.
PMID: 11312951
J Org Chem. 2001 Feb 23;66(4):1216-27. doi: 10.1021/jo0013195.

The synthesis of several 9,11,11-trihalo[5.3.1]propellanes and their 4-dimethylsila analogues is described. They solvolyze under formation of the corresponding isomeric 7,9,11- trihalobicyclo[5.3.l]undec-1(11)-enes which are "anti-Bredt" olefins with a strained trans double bond in a bridged eight-membered ring; in the presence...

A solvent-controlled switch of manganese complex assemblies with a beta-diketonate-based ligand.

Inorganic chemistry

Aromí G, Gamez P, Roubeau O, Berzal PC, Kooijman H, Spek AL, Driessen WL, Reedijk J.
PMID: 12099871
Inorg Chem. 2002 Jul 15;41(14):3673-83. doi: 10.1021/ic0200491.

The coordination properties of the new polynucleating ligand H(3)L1 (1,3-bis(3-oxo-3-phenylpropionyl)-2-hydroxy-5-methylbenzene) with Mn(II/III) are described. Depending on the solvent used, the reaction of H(3)L1 with Mn(OAc)(2) yields either of the two new multinuclear assemblies [Mn(2)(HL1)(2)(py)(4)] (1) and [Mn(3)(HL1)(3)] (2), as...

catena-Poly[[dicyanamido(5,5'-dimethyl-2,2'-bipyridine-kappa2N,N')copper(II)]-mu-dicyanamido-kappa2N1:N5].

Acta crystallographica. Section C, Crystal structure communications

Kooijman H, Spek AL, van Albada GA, Reedijk J.
PMID: 11828101
Acta Crystallogr C. 2002 Feb;58:m124-6. doi: 10.1107/s0108270101021515. Epub 2002 Jan 31.

In the crystal structure of the title compound, [Cu(C(2)N(3))(2)(C(12)H(12)N(2))](n), the Cu(II) atom adopts a distorted square-pyramidal geometry, the basal plane of which is formed by two N atoms of the bipyridine ligand, one N atom of a bidentate dicyanamide...

A multiple hydrogen-bond scaffold based on dipyrimidin-2-ylamine.

Organic letters

Söntjens SH, Meijer JT, Kooijman H, Spek AL, van Genderen MH, Sijbesma RP, Meijer EW.
PMID: 11720561
Org Lett. 2001 Nov 29;3(24):3887-9. doi: 10.1021/ol016750a.

A multiple hydrogen-bond array based on dipyrimidin-2-ylamine is presented, which is easily accessible. The influence of a preorganizing intramolecular hydrogen bond, tautomeric equilibria, and steric effects on the association behavior were investigated. X-ray diffraction shows that the molecules feature...

The Synthesizing Unit as model for the stoichiometric fusion and branching of metabolic fluxes.

Biophysical chemistry

Kooijman SA.
PMID: 17029722
Biophys Chem. 1998 Jul 13;73(1):179-88. doi: 10.1016/s0301-4622(98)00162-8.

The Synthesizing Unit (SU) binds given numbers of substrate molecules of several types of substrate to produce a product molecule or set of product molecules. Irreversible binding results in relatively simple and explicit expressions for the rate of product...

Showing 1 to 12 of 162 entries