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排序方式: 共有277条查询结果,搜索用时 18 毫秒
11.
12.
Production and physicochemical characterization of resistant starch type III derived from pea starch 总被引:1,自引:0,他引:1
Smooth pea starch was used for the production of physiological important resistant starch type III. For reduction of the molecular weight of the starch, different strategies including enzymatic debranching and acid hydrolysis (lintnerization), were tested to obtain an optimal starting material for retrogradation. The resulting polymer chain lengths were analyzed by high-performance anion-exchange chromatography. Temperature regimes and starch concentrations in gel were optimized during the retrogradation with the aim to obtain a high yield of resistant starch. Optimal conditions led to resistant starch contents up to 74%. The products were thermostable and showed no loss of resistant structures after autoclaving. The peak temperatures of the thermal transition were at approximately 147 degrees C. The resulting resistant starch products are suitable for the generation of functional foods. 相似文献
13.
Gisela Hartler 《Quality and Reliability Engineering International》1987,3(4):219-225
Estimation and test procedures are given for the parameters of the Arrhenius model. The assumed failure distribution is of exponential or Weibull type with fixed and temperature independent shape parameter. The approach is based on failure terminated experiments on at least two different tempera-ture levels with pre-assigned and equal number of failures for each temperature level. Estimation consists of two steps, modified maximum likelihood estimation followed by ordinary least squares regression. Statistical tests are defined on acceptance regions given in the particular parameter space by circles or ellipses depending only on the experimental design. 相似文献
14.
Guillermo Calleja Juan A. Botas M. Gisela Orcajo Manuel Sánchez-Sánchez 《Journal of Porous Materials》2010,17(1):91-97
Several discrepancies have emerged about the preparation methods of MOF-5 material, one of the adsorbents more studied for
hydrogen storage, because different synthesis procedures give rise to apparently isostructural materials but actually having
very different textural properties and also showing different hydrogen adsorption capacities. In this work, MOF-5 material
has been successfully synthesized according to the two most extended methods, and the respective resulting materials, IRMOF-1
and MOCP-L, have been widely characterized. Powder X-ray diffraction confirmed that MOF-5 is the main crystallized phase obtained
in both cases, and that the MOCP-L product contains some ZnO impurities, mainly in the form of segregated crystals that appear
preferentially outside the micropores. The presence of ZnO in the MOCP-L material has been also confirmed by other characterization
techniques. On the other hand, interpenetrated networks in the MOCP-L material are not significant, appearing in any case
at a similar extent than in IRMOF-1; consequently it cannot be considered for explaining the differences observed in the adsorption
capacity of both materials. These differences cannot be completely explained simply by the segregated ZnO impurities, so the
presence of some ZnO nanocrystals partially blocking the micropores of MOCP-L must be admitted. 相似文献
15.
Julia E. Tasca Agustín Ponzinibbio Gisela Diaz Rodolfo D. Bravo Araceli Lavat María G. González 《Topics in Catalysis》2010,53(15-18):1087-1090
An efficient protocol for the rapid room temperature deacetylation of carbohydrate derivatives using CuFe2O4 nanoparticles as an inexpensive and reusable catalyst is presented. After separation of the catalyst with an external magnet, the reaction products are easily obtained in good purity and excellent yields. 相似文献
16.
17.
Katrina M. Nordstrom Anne M. Belcher Gisela Epple Kay L. Greenfield James J. Leyden Amos B. Smith III 《Journal of chemical ecology》1989,15(2):629-639
The resident skin surface microflora of 12 male and three femaleSaguinus fuscicollis was studied. The suprapubic-circumgenital gland surface and the perirectal area were most heavily colonized (106–108 colony forming units/cm2), but high numbers of organisms were also present on the abdomen, the sternal gland surface, and palms and plantar surfaces. Bacteria were also recovered from hair clippings as well as from shaven skin surface, although at much lower densities (102–104 colony forming units/cm2). Coagulase negative staphylococci, gram-negative bacteria,Streptococcus species and coryneform bacteria were most dominant.Staphylococcus aureus and species ofBacillus were also present. Fungi, yeast, and dermatophytes were infrequently recovered or completely absent. The microbial flora of these tamarins appears to be closely associated with the secretions of the circumgenital scent gland and would therefore be ideally situated to participate in the generation or modification of chemical signals. 相似文献
18.
Microbiological and Physicochemical Quality Changes in Frankfurters Made from Jumbo Squid (Dosidicus gigas) Mantle Muscle in the Presence and Absence of a Natural Antimicrobial Agent
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20.
Lydia Toscano Gisela MonteroMargarita Stoytcheva Héctor CampbellAlejandro Lambert 《Biomass & bioenergy》2011,35(1):26-31
Oil derived fuels constituted a main energy source during the last fifty years, although their high price limited their accessibility. Prospective studies indicated that economic and environmental problems promoted biodiesel production using biomass and residues like animal fat, along with meat and bones, among others. The regional inventory of the available fat in meat industry, as well as the estimation of the biodiesel potential production demonstrated that the biodiesel generated from animal fat, combined with diesel from oil in a 2% biodiesel blend could power 25% of the trucks and passenger vehicles registered in 2007 in Baja California, Mexico. 相似文献