3,130 research outputs found
Genomics and synthetic biology as a viable option to intensify sustainable use of biodiversity
No full textThe Amazon basin is an area of mega-biodiversity. Different models have been proposed^1-8^ for the establishment of an effective conservation policy, increasing sustainability and adding value for biodiversity. Currently, a broad spectrum of technologies from genomics to synthetic biology is available, and these permit the collection, manipulation and effective evaluation of countless organisms, metabolic pathways and molecules that exist as potential products of a large, biodiverse ecosystem. The use of Genomics and synthetic biology may constitute an important tool and be a viable option for the prospection, evaluation and manipulation of biodiversity as advocated as well as be useful for developing methods for sustainable use and the production of novel molecules
Characterization of transgene integration sites of genetically modified fibroblasts.
No full textNa publicação: Rech, E. L
Identification and studies of dna integration sites in transgenic mdbk single cell lines.
No full textNa publicação: Rech, E. L
Results on the neutron energy distribution measurements at the RECH-1 Chilean nuclear reactor
No full textNeutron activations experiments has been perform at the RECH-1 Chilean Nuclear Reactor to measure its neutron flux energy distribution. Samples of pure elements was activated to obtain the saturation activities for each reaction. Using - ray spectroscopy we identify and measure the activity of the reaction product nuclei, obtaining the saturation activities of 20 reactions. GEANT4 and MCNP was used to compute the self shielding factor to correct the cross section for each element. With the Expectation-Maximization algorithm (EM) we were able to unfold the neutron flux energy distribution at dry tube position, near the RECH-1 core. In this work, we present the unfolding results using the EM algorithm
Evaluation of the growth-performance and carcass characteristics of commercial pigs produced in Quebec
No full textData for a total of approximately 2900 commercial pigs tested in 12 trials from 1987 to 1990 at the Beaumont test station in Quebec were used to determine the effect of sex, sire breed, cross type and parity number of the dam on growth performance and carcass characteristics. Pigs were housed four to a pen and were fed commercial diets. Feed intake and growth rate were measured during the test, and carcass measurements were taken at slaughter and at 24 or 72 h following slaughter. Castrated males ate more per day, had a better gain and reached slaughter weight (96.4 +/- 5.6 kg) at a younger age than gilts. Gilts had a better carcass yield and were leaner than castrated males. Commercial pigs sired from Duroc or Duroc-Hampshire boars had a growth performance superior to that of pigs sired by Landrace, Yorkshire or Hampshire boars. Progeny from Duroc or Duroc-Hampshire boars also produced carcasses with less loin fat, a thicker loin muscle, a higher estimated lean yield and a better classification index. Pigs from three-way crosses had a higher average daily gain and a better feed conversion than pigs from other types of crosses (single, backcross, four-way, synthetic and purebred), and they reached market weight at a younger age. Most carcass characteristics were also affected by the type of cross, but no specific type of cross was clearly superior to the others for the various variables studied. An increase in parity number of the dam caused a gradual decrease in growth performance, except for pigs from parity six, which presented the best results. There was also a linear decrease in loin muscle thickness, estimated lean yield and classification index and a linear increase in loin fat thickness with increase in parity number of the dam.PT: J; CR: 1985, SAS USERS GUIDE STAT 1991, PROFIL SECTORIEL IND BERESKIN B, 1975, J ANIM SCI, V40, P53 BERESKIN B, 1978, J ANIM SCI, V46, P1581 CHRISTIAN LL, 1980, J ANIM SCI, V51, P51 CUNNINGHAM PJ, 1973, J ANIM SCI, V37, P75 DREWRY KJ, 1981, J ANIM SCI, V52, P197 FAHMY MH, 1977, WORLD REV ANIMAL PRO, V13, P9 GILSTER KE, 1973, J ANIM SCI, V36, P888 GODBOUT D, 1990, C PROUCTION PORCINE, P129 JOHNSON RK, 1978, J ANIM SCI, V46, P69 KENNEDY BW, 1978, ANIM PROD, V27, P29 KORNEGAY ET, 1973, J ANIM SCI, V36, P79 KUHLERS DL, 1981, J ANIM SCI, V53, P40 KUHLERS DL, 1982, J ANIM SCI, V55, P236 LABROUE F, 1992, J RECH PORC FR, V24, P31 LANGLOIS A, 1989, J ANIM SCI, V67, P2018 LEBEAU S, 1990, ANNUAIRE STATISTIQUE, P12 LEGAULT C, 1969, ANN GENET SEL ANIM, V1, P281 MARTEL J, 1988, J ANIM SCI, V66, P41 MARTIN AH, 1980, J ANIM SCI, V50, P699 MILLER HW, 1979, J ANIM SCI, V49, P943 MINVIELLE F, 1986, C PRODUCTION PORCINE, P19 RAMSEY CB, 1990, J ANIM SCI, V68, P148 SALMONLEGAGNEUR E, 1966, ANN ZOOTECH, V15, P215 SATHER AP, 1980, J ANIM SCI, V51, P28 SAVOIE Y, 1988, CAN J ANIM SCI, V68, P1051 SCHNEIDER JF, 1982, J ANIM SCI, V54, P728 SELLIER P, 1981, J RECH PORC FR, V13, P299 SELLIER P, 1982, JOURN RECH PORC FRAN, V14, P159 SHERIDAN AK, 1981, ANIM BREED ABSTR, V49, P131 WILSON ER, 1981, J ANIM SCI, V52, P18 WILSON ER, 1981, J ANIM SCI, V52, P26; NR: 33; TC: 8; J9: CAN J ANIM SCI; PG: 14; GA: MA502Source type: Electronic(1
Sequence analysis from rescued plasmids from soybean obtained by biolistics suggest that multiple copies of the transgenes may originate by replication of exogenous DNA.
No full textNa publicação: Romano, E.; Rech, E.; Aragão, F
9alfa-hydroksypartenolid w Zoegea leptaurea subsp. mesopotamica (Czerep.) Rech. (Asteraceae)
No full textFrom the aerial parts of Zoegea leptaurea subsp. mesopotamica (Czerep.) Rech. (syn Zoegea mesopotamica Czerep.), 9α-hydroxyparthenolide was isolated. This compound was identified by spectral methods (1H NMR and 13C NMR). This research confirmed earlier indications about the presence of 4,5-epoxygermacranolides in the Zoegea L. genus. Thus, distinctive chemistry feature of plants in this taxon has chemotaxonomic implications.Z ziela Zoegea leptaurea subsp. mesopotamica (Czerep.) Rech. (syn Zoegea mesopotamica Czerep.)
wyizolowano 9α-hydroksypartenolid. Związek ten zidentyfikowano za pomocą analiz
spektralnych (1H NMR i 13C NMR). Potwierdzono tym samym wcześniejsze doniesienia
o występowaniu 4,5-epoksygermakranolidów w rodzaju Zoegea L. Uzyskane dane mają
walor chemotaksonomiczny
Simplified dynamic modeling of single-tank thermal energy storage systems
No full textThe paper analyzes the behavior of the most common single-tank configurations of thermal storage capacities that involve transfer of mass (open systems) or/and heat (closed/hybrid systems), in presence or not of solid or phase-change filler materials. This is done using simplified dynamic models of different complexity: zero-dimensional, quasi-one-dimensional and one-dimensional. The aim is to show whether, and within which limits, simplified models can substitute more complex and time consuming two or three-dimensional ones. The comparison with experimental data showed that the onedimensional model is able to predict performance, thermal stratification and any other relevant aspect of the storage behavior with sufficient accuracy. Conversely, the other two approaches do not show this ability because they neglect or underestimate the heat transferred along the longitudinal direction of the storage capacity. One-dimensional simulations show that higher charging efficiency can be achieved using open systems (þ2.4% points compared to closed systems) and reducing the diameter of the filler material particles, if present. In closed systems the length of the cold heat exchanger can be reduced to half of the tank height with minimum decrease (about 0.6% after 1 h) of the temperature at which the thermal energy can be taken from the storage
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