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1.
The Wageningen Delivery of Functionality symposium covered all aspects involved with food structural design to arrive at high-quality
foods which meet demanding customer expectations and regulatory requirements. The symposium integrated aspects from the structural
organization of foods at molecular and supramolecular scales to dedicated techniques required to describe and visualize such
structures, the gastro-intestinal events and how to model these in a laboratory setting, and finally the impact those food
structures and ingredients have on the consumer’s physiology and on the human perception. As an interdisciplinary platform,
bringing together more than 160 researchers from academia and industry, the symposium meanwhile fulfills an important role
in the food science community. 相似文献
2.
Job Kuijt 《Brittonia》2003,55(2):169-172
A new species ofOryctina (Loranthaceae) from Guyana,O. atrolineata Kuijt is described and illustrated. It possesses one-flowered inflorescences, the flowers being hexamerous and each subtended
by a bract and two minute bracteoles. A peculiarity of the style is a distinctive fusiform, subterminal swelling.Oryctina atrolineata is closely related, and similar to,O. myrsinites (Eichler) Kuijt. 相似文献
3.
Purification and Synthesis under Anaerobic Conditions of Rice Arginine Decarboxylase 总被引:1,自引:0,他引:1
Arginine decarboxylase (ADC; EC 4.1.1.19
[EC]
) which catalyzes thesynthesis of putrescine, is involved in the responses of plantsto stress. The enzyme was purified 1,561-fold from rice coleoptilesby steps that included ammonium sulfate fractionation, gel filtration,ion-exchange chromatography and chromatofocusing. The purifiedenzyme had a pI of 5.3, a molecular mass of 176 kDa and appearedto be composed of three subunits of 63 kDa. A polyclonal antibodywas raised in a rabbit and the IgG fraction was purified fromserum. On Western blots the antibody recognized the ADC fromboth rice and E. coli. Immunoprecipitation with the ADC-specificantibodies allowed detection of radiolabelled ADC in extractsfrom aerobically and anaerobically grown rice seedlings thathad been supplied with a mixture of 14C-amino acids. This resultis discussed in relation to the role of ADC under anaerobicconditions. (Received April 28, 1994; Accepted September 27, 1994) 相似文献
4.
Polyamines and Anaerobic Elongation of Rice Coleoptile 总被引:2,自引:0,他引:2
The role of polyamines in the anaerobic elongation of rice (Oryzasativa L.) coleoptiles was studied. The reduced growth of ricecoleoptiles under anoxic conditions was accompanied by a massiveaccumulation of free putrescine. Putrescine was synthesizedfrom arginine in a reaction catalyzed by arginine decarboxylase(ADC). The anoxic titer of putrescine was closely correlatedwith elongation of coleoptiles. In experiments in which putrescineand inhibitors [-difluoromethylarginine (DFMA) and -difluoromethylornithine(DFMO)] of the synthesis of polyamines were exogenously supplied,we demonstrated an absolute requirement for putrescine, synthesizedby ADC, for anaerobic elongation of coleoptiles. The presenceof exogenous putrescine (alone or in combination with DFMA)increased the rate of anaerobic elongation of coleoptile by3040%. (Received December 1, 1988; Accepted June 19, 1989) 相似文献
5.
Cholesterylphosphoryldimethylethanolamine is a zwitterionic compound which is a good bilayer stabilizer. As has been found with many other compounds having these properties, cholesterylphosphoryldimethylethanolamine is found to be a potent inhibitor of protein kinase C in both vesicle and micelle assay systems. The kinetics of the inhibition in Triton X-100 micelles was non-competitive with respect to ATP, histone, diolein, phorbol ester and Ca2+. It has a Ki of about 30 m. The inhibition kinetics as a function of phosphatidylserine concentration is more complex but suggestive of competitive inhibition. Cholesterylphosphoryldimethylethanolamine does not prevent the partitioning of protein kinase C into the membrane. This inhibitor lowers the Ca2+-phosphatidylserine-independent phosphorylation of protamine sulfate by protein kinase C and directly affects the catalytic segment of the enzyme generated by tryptic hydrolysis. Thus, this zwitterionic bilayer stabilizing inhibitor of protein kinase C both competes with the binding of phosphatidylserine as well as affects the active site of protein kinase C.Abbreviation CPD
cholesterylphosphoryldimethylethanolamine 相似文献
6.
Abortive intermediates in transcription by wheat-germ RNA polymerase II. Dynamic aspects of enzyme/template interactions in selection of the enzyme synthetic mode. 总被引:1,自引:0,他引:1 下载免费PDF全文
L de Mercoyrol J M Soulié C Job D Job C Dussert J Palmari M Rasigni G Rasigni 《The Biochemical journal》1990,269(3):651-658
7.
Reggiani Remo; Cantu Carlo Alberto; Brambilla Ida; Bertani Alcide 《Plant & cell physiology》1988,29(6):981-987
In excised rice roots, anaerobic degradation of proteins gaverise to an increase of free-amino acids. Anoxic accumulationof alanine, -aminobutyric acid and proline was the consequenceof the interconversion of glutamate, aspartate and amides. Theshift in the composition of the amino acid pool appears to becaused by changes in keto acid levels. The role of reactionsinvolved in amino acid interconversion and the physiologicalsignificance of these interconversions are considered and discussed. (Received November 25, 1988; Accepted June 9, 1988) 相似文献
8.
Sliding of STOP proteins on microtubules 总被引:5,自引:0,他引:5
Microtubules are stabilized against cold temperature disassembly by 145-kilodalton proteins [stable tubule only polypeptides (STOPs)] that block the end-wise dissociation of subunits from the polymers. We describe here several kinetic parameters of the interaction of STOPs with microtubules. STOPs will bind to microtubules either during assembly of the polymer or at steady state. The addition appears random on the polymers and does not require the mediation of tubulin subunits. Tubulin subunits compete with microtubules for STOP binding, but binding to the polymers is apparently irreversible. We demonstrate that STOPs do not exchange measurably between polymers at steady state. Nonetheless, a displacement of STOPs within a single polymer is readily demonstrable. We have determined that the displacement is apparently due to a surface translocation, or "sliding", of STOPs on microtubules. 相似文献
9.
10.