Results 31 to 40 of about 1,087 (169)

Biosynthesis of lasalocid. III. Isolation and structure determination of four homologs of lasalocid A.

The Journal of Antibiotics, 1974
Four isomeric homologs of lasalocid A have been isolated from cultures of Streptomyces lasaliensis. The homologs each arise by replacement of one of the four propionate derived methyls in lasalocid A by an ethyl group, which results in each homolog molecule containing four C-ethyls.
J W, Westley, W, Benz, J, Donahue, R H, Evans, C G, Scott, A, Stempel, J, Berger   +6 more
openaire   +3 more sources

Safety and efficacy of Avatec® 150G (lasalocid A sodium) as a feed additive for chickens for fattening and chickens reared for laying

EFSA Journal, 2020
Following a request from the European Commission, the Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) was asked to deliver a scientific opinion on the safety and efficacy of Avatec® 150G (lasalocid A sodium) for chickens for ...
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Vasileios Bampidis, Giovanna Azimonti, Maria de Lourdes Bastos, Henrik Christensen, Birgit Dusemund, Maryline Kouba, Mojca Kos Durjava, Marta López‐Alonso, Secundino López Puente, Francesca Marcon, Baltasar Mayo, Alena Pechová, Mariana Petkova, Fernando Ramos, Yolanda Sanz, Roberto Edoardo Villa, Ruud Woutersen, Jürgen Gropp, Guido Rychen, Orsolya Holczknecht, Maria Vittoria Vettori   +21 more
doaj   +1 more source

BIOSYNTHESIS OF LASALOCID. I

The Journal of Antibiotics, 1974
The biosynthesis of lasalocid A (formerly antibiotic X-537 A) in cultures of Strepto-myces lasaliensis has been studied using 13C- and 14C-labelled precursors. The antibiotic is derived from five acetate, four propionate and three butyrate units. This study has provided the first illustration of an ethyl group arising from butyrate and 2-ethylmalonate.
J. W. WESTLEY, R. H. Jr. EVANS, G. HARVEY, R. G. PITCHER, D. L. PRUESS, A. STEMPEL, J. BERGER   +6 more
openaire   +2 more sources

Scientific Opinion on the safety and efficacy of Avatec® 150G (lasalocid A sodium) for turkeys

EFSA Journal, 2010
Avatec® 150G is an anticoccidial feed additive containing 15 % lasalocid A sodium, a polyether ionophore produced by fermentation of Streptomyces lasaliensis.
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP)
doaj   +1 more source

Influence of Ionophore Supplementation on Growth Performance, Dietary Energetics and Carcass Characteristics in Finishing Cattle during Period of Heat Stress [PDF]

Asian-Australasian Journal of Animal Sciences, 2013
Forty-eight crossbred heifers (378.1±18 kg) were used in a 56-d feeding trial (four pens per treatment in a randomised complete block design) to evaluate the influence of ionophore supplementation on growth performance, dietary energetics and carcass ...
A. Barreras, B. I. Castro-Pérez, M. A. López-Soto, N. G. Torrentera, M. F. Montaño, A. Estrada-Angulo, F. G. Ríos, H. Dávila-Ramos, A. Plascencia, R. A. Zinn   +9 more
doaj   +1 more source

Desenvolvimento de novilhas de corte sob alternativas de mineralização em pastagem de azevém Development of beef heifers under mineralization alternatives, on Italian ryegrass pasture

Ciência Rural, 2009
Foi avaliado o desenvolvimento corporal de bezerras de corte em pastagem de azevém (Lolium multiflorum Lam.), recebendo diferentes alternativas de suplementação mineral, associadas ou não à adição de ionóforo.
Luciana Pötter, Marta Gomes da Rocha, Alexandre Nunes Motta de Souza, Dalton Roso, Carine Lisete Glienke, Vagner Guasso da Costa, Renato Alves de Oliveira Neto, Gustavo Freitas Ilha   +7 more
doaj   +1 more source

Scientific Opinion on the safety and efficacy of Avatec®150G (lasalocid A sodium) for pheasants, partridges, quails and guinea‐fowl

EFSA Journal, 2011
Avatec®150G is a coccidiostat containing 15 % of the active substance lasalocid A sodium. Avatec®150G is proposed as a coccidiostat for pheasants, partridges, quails and guinea fowl at a dose range of 75–120 mg lasalocid sodium/kg complete feed. Based on
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP)
doaj   +1 more source

P450 Enzyme LyoI Performs Hydro‐2,2′‐Bifuran Oxidation in the Polyether Ionophore Lysocellin

Angewandte Chemie, Volume 137, Issue 43, October 20, 2025.
In a study of the biosynthesis of the polyether ionophore lysocellin, the P450 enzyme LyoI was found to catalyze a rare oxidation of a hydro‐2,2′‐bifuran moiety to its hemiketal form. The oxidation was identified as the key for unlocking the bioactivity of lysocellin.
Michelle H. Rasmussen, Søren L. B. Møller, Esben B. Svenningsen, Thomas Tørring, Thomas B. Poulsen   +4 more
wiley   +2 more sources

In vitro effect of pH on resistance of ruminal bacteria to intracellular potassium depletion, and effect of pH and ionophores on ammonia and microbial protein production Efeito do pH in vitro sobre a resistência de bactérias do rúmen à perda de potássio intracelular e efeito do pH e de ionóforos sobre a produção de amônia e proteína microbiana

Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2005
Ruminal fluid from steers fed on pasture was incubated with artificial media at pH 5.5 and 7.0 in two experiments. In the first, the effect of monensin level on resistance of ruminal bacteria to potassium depletion was evaluated; in the second, effects ...
W.M. Leopoldino, R.P. Lana, A.C. Borges, H.C. Mantovani, R.M.A. Teixeira, J.S. Oliveira, A.R. Jaremtchuk, E.C. Eifert, R.G.R. Martins   +8 more
doaj   +1 more source

Cylinder Plate Assay for Lasalocid Sodium

Journal of AOAC INTERNATIONAL, 1974
Abstract A microbiological assay method is described for the determination of the coccidiostat lasalocid sodium in premixes and finished poultry feeds. Premixes are extracted with absolute methanol and diluted to assay range with 25% methanol in the final dilution.
J M, Scheiner, W M, Cort, J, Chen
openaire   +2 more sources