Results 41 to 50 of about 3,272 (193)

Oxidation of Olefins by Chromic Acid [PDF]

open access: yesNature, 1947
The oxidation of 2:4: 4-trimethylpentene-1 [α–diisobutylene] [I] by chromium tri-oxide dissolved in acetic anhydride yields a neutral oil containing largely 2: 4: 4-trimethylpentan-1: 2-epoxide [II] with smaller amounts of 2: 2-dimethylpentanone-4. [V], 2: 4: 4-trimethylpentanal [III] with 2: 4: 4-trimethylpentan-1: 2-diol [IV] and unsaturated alcohols
A. BYERS, W. J. HICKINBOTTOM
openaire   +1 more source

Avaliação de indicadores para estimativa das digestibilidades parciais e total de dietas em bovinos Evaluation of markers for estimating ruminal, intestinal and total tract digestibility of nutrients in cattle

open access: yesRevista Brasileira de Zootecnia, 2007
Avaliaram-se os indicadores fibra detergente ácido indigestível (FDAi) e óxido crômico (Cr2O3) na estimativa das digestililidades parciais e total das frações nutritivas da dieta.
Rodolfo Marques de Brito   +5 more
doaj   +1 more source

Digestibilidade aparente e verdadeira do fósforo de alimentos de origem animal para suínos Apparent and true digestibility of phosphorus from animal origin feedstuffs for swines

open access: yesArquivo Brasileiro de Medicina Veterinária e Zootecnia, 2009
Determinaram-se os coeficientes de digestibilidade aparente (CDAP) e verdadeira (CDVP) do fósforo de alimentos de origem animal. Foram utilizados 24 suínos, machos castrados, com média de peso de 25,0±3,0kg no período de crescimento e 24 suínos com média
S. Bünzen   +6 more
doaj   +1 more source

Performance and digestibility in feedlot lambs fed hay based diets

open access: yesActa Scientiarum: Animal Sciences, 2016
This study aimed to evaluate the performance of feedlot lambs fed diets formulated with hay of different genotypes of Cynodon spp. and to compare the dry matter digestibility of diets using different evaluation methods (total fecal collection and ...
Euclides Reuter de Oliveira   +5 more
doaj   +1 more source

Bovine Nutritional Needs: Digestibility of Dry and Ensiled Forages when Feeding Young Dairy Heifers

open access: yesJournal of Purdue Undergraduate Research, 2012
The diets fed to growing animals are very important to ensure that young animals have the proper nutrients available for growth. When feeding dairy heifers, a farmer’s goal is to feed a very digestible diet that will provide nutrients to keep dairy ...
Shirley Nigaglioni
doaj  

Ingestive behavior, performance and forage intake by beef heifers on tropical pasture systems

open access: yesRevista Brasileira de Zootecnia, 2013
The experiment was carried out to evaluate forage intake, performance and ingestive behavior of beef heifers. Productive, structural and chemical characteristics of the pasture were also evaluated. The experimental design was completely randomized in a 3
Renato Alves de Oliveira Neto   +7 more
doaj   +1 more source

Evaluation of fecal recovering and long term bias of internal and external markers in a digestion assay with cattle Recuperação fecal e vício de tempo longo de indicadores internos e externos em ensaio de digestão com bovinos

open access: yesRevista Brasileira de Zootecnia, 2011
The objective of this work was to estimate the total recovering and the long term bias of the estimates of fecal excretion using the external markers chromic oxide and titanium dioxide and internal markers indigestible dry matter (iDM), indigestible ...
Cláudia Batista Sampaio   +5 more
doaj   +1 more source

Carbon monoxide adsorption on NaY zeolite and impregnated with 5% niobium: Characteristics and fixed‐bed study

open access: yesThe Canadian Journal of Chemical Engineering, EarlyView.
Schematic of the CO adsorption process in a fixed‐bed column containing pure NaY zeolite and Nb‐modified NaY (NaY–5%Nb). On the left, breakthrough curves and temperature profiles highlight the dynamic performance and thermal effects during CO adsorption.
Elson Oliveira   +3 more
wiley   +1 more source

One century of teaching, research, and innovation in chemical engineering in Mexico: The role of chemical engineering in the background and future of polymer science and industrial production in Mexico

open access: yesThe Canadian Journal of Chemical Engineering, EarlyView.
Timeline of key academic milestones and individuals that shaped chemical engineering at FQ‐UNAM and in Mexico. Abstract One hundred years after the beginning of the teaching of Chemical Engineering in Mexico, which started in 1925 in the former National School of Chemical Sciences, currently Faculty of Chemistry (FQ) at National Autonomous University ...
Patricia Pérez‐Salinas   +2 more
wiley   +1 more source

Transition Metal Compounds as Thermochromic Materials: Classification, Properties, Limitations, and Applications

open access: yesEcoEnergy, EarlyView.
This review systematically examines how different transition metal compounds—such as binary and multinary metal oxides, halides, sulfides, and salts—exhibit thermochromism based on the d‐electron configurations of their transition metal cations. It focuses on three main mechanisms of thermochromism: phase transition, charge transfer, and bandgap change.
Jie Wang   +5 more
wiley   +1 more source

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