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Preliminary investigation of feeding performance of larvae of early red-spotted grouper, Epinephelus coioides, reared with mixed zooplankton 总被引:5,自引:0,他引:5
Masanori Doi Joebert D. Toledo Ma Salvacion N. Golez Miguel de los Santos Atsushi Ohno 《Hydrobiologia》1997,358(1-3):259-263
Larvae of red-spotted grouper, Epinephelus coioides, were reared inoutdoor tanks with nauplii of copepods (mainly Pseudodiaptomus annandaleiand Acartia tsuensis) and/or rotifers, Brachionus rotundiformis. Grouperlarvae successfully started feeding on early stage nauplii even though theirabundance was as low as approximately 100 individuals l–1 andshowed better survival and growth thereafter compared to those fed withrotifers only. Incidence of feeding reached 100% on day 4 whennauplii were available and only on day 9 when rotifers were given alone.Larvae seemed to be poor feeders at the onset of feeding, attempting tocapture any food organisms in the tank water. Selective feeding ability oflarvae started from day 4 and the larvae then preferred to feed on medium-and large-size nauplii rather than on rotifers as they grew. Larvae appearedto have a better chance at surviving in the presence of early stage nauplii,which were probably caught more easily than rotifers. 相似文献
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Genetic analysis of potassium transport loci in Escherichia coli: evidence for three constitutive systems mediating uptake potassium. 总被引:14,自引:9,他引:5 下载免费PDF全文
D C Dosch G L Helmer S H Sutton F F Salvacion W Epstein 《Journal of bacteriology》1991,173(2):687-696
The analysis of mutants of Escherichia coli that require elevated concentrations of K+ for growth has revealed two new genes, trkG, near minute 30 within the cryptic rac prophage, and trkH, near minute 87, the products of which affect constitutive K+ transport. The analysis of these and other trk mutations suggests that high rates of transport, previously considered to represent the activity of a single system, named TrkA, appear to be the sum of two systems, here named TrkG and TrkH. Each of these two is absolutely dependent on the product of the trkA gene, a cytoplasmic protein associated with the inner membrane (D. Bossemeyer, A. Borchard, D. C. Dosch, G. C. Helmer, W. Epstein, I. R. Booth, and E. P. Bakker, J. Biol. Chem. 264:16403-16410, 1989). The TrkH system is also dependent on the products of the trkH and trkE genes, while the TrkG system is also dependent on the product of the trkG gene and partially dependent on the product of the trkE gene. It is suggested that the trkH and trkG products are membrane proteins that form the transmembrane path for the K+ movement of the respective systems. Two mutations altering the trkA product reduce the affinity for K+ of both TrkG and TrkH, indicating that changes in peripheral protein can alter the conformation of the sites at which K+ is bound prior to transport. The TrkD system has a relatively modest rate of transport, is dependent solely on the product of the trkD gene, and is the sole saturable system for Cs+ uptake in this species (D. Bossemeyer, A. Schl?sser, and E. P. Bakker, J. Bacteriol. 171:2219-2221, 1989). 相似文献
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Zhenrong Xu Salvacion Cacatian Jing Yuan Robert D. Simpson Lanqi Jia Wei Zhao Colin M. Tice Patrick T. Flaherty Joan Guo Alexey Ishchenko Suresh B. Singh Zhongren Wu Brian M. McKeever Boyd B. Scott Yuri Bukhtiyarov Jennifer Berbaum Jennifer Mason Reshma Panemangalore Maria Grazia Cappiello Ross Bentley David A. Claremon 《Bioorganic & medicinal chemistry letters》2010,20(2):694-699
Structure-guided drug design led to new alkylamine renin inhibitors with improved in vitro and in vivo potency. Lead compound 21a, has an IC50 of 0.83 nM for the inhibition of human renin in plasma (PRA). Oral administration of 21a at 10 mg/kg resulted in >20 h reduction of blood pressure in a double transgenic rat model of hypertension. 相似文献
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Yuan J Simpson RD Zhao W Tice CM Xu Z Cacatian S Jia L Flaherty PT Guo J Ishchenko A Wu Z McKeever BM Scott BB Bukhtiyarov Y Berbaum J Panemangalore R Bentley R Doe CP Harrison RK McGeehan GM Singh SB Dillard LW Baldwin JJ Claremon DA 《Bioorganic & medicinal chemistry letters》2011,21(16):4836-4843
Structure-based design led to the discovery of a novel class of renin inhibitors in which an unprecedented phenyl ring filling the S1 site is attached to the phenyl ring filling the S3 pocket. Optimization for several parameters including potency in the presence of human plasma, selectivity against CYP3A4 inhibition and improved rat oral bioavailability led to the identification of 8d which demonstrated antihypertensive efficacy in a transgenic rat model of human hypertension. 相似文献
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Colin M. Tice Wei Zhao Zhenrong Xu Salvacion T. Cacatian Robert D. Simpson Yuan-Jie Ye Suresh B. Singh Brian M. McKeever Peter Lindblom Joan Guo Paula M. Krosky Barbara A. Kruk Jennifer Berbaum Richard K. Harrison Judith J. Johnson Yuri Bukhtiyarov Reshma Panemangalore Boyd B. Scott Yi Zhao Joseph G. Bruno David A. Claremon 《Bioorganic & medicinal chemistry letters》2010,20(3):881-886
Structure-guided drug design led to the identification of a class of spirocyclic ureas which potently inhibit human 11β-HSD1 in vitro. Lead compound 10j was shown to be orally bioavailable in three species, distributed into adipose tissue in the mouse, and its (R) isomer 10j2 was efficacious in a primate pharmacodynamic model. 相似文献
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Colin M. Tice Zhenrong Xu Jing Yuan Robert D. Simpson Salvacion T. Cacatian Patrick T. Flaherty Wei Zhao Joan Guo Alexey Ishchenko Suresh B. Singh Zhongren Wu Boyd B. Scott Yuri Bukhtiyarov Jennifer Berbaum Jennifer Mason Reshma Panemangalore Maria Grazia Cappiello Dominik Müller Richard K. Harrison Gerard M. McGeehan David A. Claremon 《Bioorganic & medicinal chemistry letters》2009,19(13):3541-3545
Structure-based drug design led to the identification of a novel class of potent, low MW alkylamine renin inhibitors. Oral administration of lead compound 21l, with MW of 508 and IC50 of 0.47 nM, caused a sustained reduction in mean arterial blood pressure in a double transgenic rat model of hypertension. 相似文献
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High concentrations of choline and phosphorylcholine blocked the adsorption of pneumococcal autolytic enzyme to homologous cell walls and inhibited enzymatic cell wall hydrolysis in a noncompetitive manner. Enzyme adsorption had an absolute requirement for the presence of choline residues in the wall teichoic acid. Other amino alcohols and derivatives such as ethanolamine, monomethylaminoethanolamine , and phosphorylethanolamine had no effect on enzyme adsorption or hydrolytic activity. It is proposed that enzymatic hydrolysis of cell walls requires prior adsorption of enzyme molecules to the insoluble wall substrate and that cholin residues of the wall teichoic acid have the role of adsorption ligands in this process. 相似文献
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