Relevant bibliographies by topics / Digestione acida

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Digestione acida'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Digestione acida"

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Liu, S. Y., and P. H. Selle. "Starch and protein digestive dynamics in low-protein diets supplemented with crystalline amino acids." Animal Production Science 57, no. 11 (2017): 2250. http://dx.doi.org/10.1071/an17296.

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Digestive dynamics of starch and protein is defined as digestion of starch and protein, absorption of glucose and amino acids from the gut lumen and their transition across enterocytes to enter the portal circulation. Digestive dynamics consider the extent, rate and site of nutrient digestion along the small intestine and the bilateral, post-enteral bioavailability of glucose and amino acids. The underlying premise is that glucose and amino acids should be made available in appropriately balanced quantities at the sites of protein synthesis for efficient protein deposition and growth performance. Previous studies have suggested that feed conversion efficiency may be enhanced by rapidly digestible protein and that crystalline amino acids could be considered sources of ‘rapid protein’. At present, crystalline lysine, methionine and threonine are routinely included in broiler diets; moreover, an increasing array of both essential and non-essential crystalline amino acids is becoming commercially available. Despite unrestricted feed access in commercial chicken-meat production systems during the period of illumination, it appears that the intermittent feed consumption patterns of broiler chickens still provide scope for asynchronies in digestion and absorption of nutrients, which affects broiler performance. A better understanding of the post-enteral, bilateral bioavailability of glucose and amino acids in low-protein diets containing high levels of synthetic amino acids is clearly desirable and this applies equally to the relationship between crystalline and protein-bound amino acids.
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Truong, Ha H., Sonia Y. Liu, and Peter H. Selle. "Starch utilisation in chicken-meat production: the foremost influential factors." Animal Production Science 56, no. 5 (2016): 797. http://dx.doi.org/10.1071/an15056.

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Starch is the chief dietary energy source for chicken-meat production, the majority of which is derived from the grain basis of diets for broiler chickens. The utilisation of starch from maize is of a high order in terms of ileal starch digestibility coefficients but this is not necessarily the case with wheat or sorghum. This may stem from the fact that maize essentially lacks the soluble non-starch polysaccharides in wheat and ‘non-tannin’ phenolic compounds found in sorghum. Numerous factors may influence starch digestibility with emphasis placed on starch–protein interactions as starch granules are located in the prolamin protein matrixes of grain endosperm. This close proximity facilitates any physical and chemical interactions and in this connection particular attention has been paid to kafirin, the dominant protein fraction in sorghum. Nevertheless, despite their apparent importance, the precise nature of starch–protein interactions has not been well defined. Exogenous phytases are routinely included in broiler diets primarily to liberate phytate-bound phosphorus; however, phytate may impede starch digestion and may retard glucose absorption. Additional feed additives, including non-starch polysaccharide-degrading enzymes, other exogenous enzymes and reducing agents may have the capacity to influence starch utilisation. Nevertheless, ileal and total tract starch digestibility coefficients are static parameters and overlook the digestive dynamics of starch, which is inappropriate given the possibility that slowly digestible starch enhances energy utilisation and feed conversion efficiency. However, if the slowly digestible starch concept is valid, the underlying mechanisms have not been fully elucidated. Consideration is given to the suggestion that slowly digestible starch ameliorates the catabolism of amino acids to provide energy to the gut mucosa by increasing the provision of glucose to posterior small intestinal segments. There is the prospect that whole grain feeding provides slowly digestible starch in addition to generating heavier relative gizzard weights. The digestive dynamics of starch and protein are inter-related and the digestion of starch and absorption of glucose should not be considered in isolation from protein digestion and amino acid absorption in the quest to improve the performance of broiler chickens. The foremost factor influencing starch utilisation in chicken-meat production may be the interaction between starch and protein digestive dynamics.
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Scheppach, Wolfgang, Hardi Luehrs, and Thomas Menzel. "Beneficial health effects of low-digestible carbohydrate consumption." British Journal of Nutrition 85, S1 (March 2001): S23—S30. http://dx.doi.org/10.1079/bjn2000259.

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Low-digestible carbohydrates represent a class of enzyme-resistant saccharides that have specific effects on the human gastrointestinal tract. In the small bowel, they affect nutrient digestion and absorption, glucose and lipid metabolism and protect against known risk factors of cardiovascular disease. In the colon they are mainly degraded by anaerobic bacteria in a process called fermentation. As a consequence, faecal nitrogen excretion is enhanced, which is used clinically to prevent or treat hepatic encephalopathy. Low-digestible carbohydrates are trophic to the epithelia of the ileum and colon, which helps to avoid bacterial translocation. Short-chain fatty acids are important fermentation products and are evaluated as new therapeutics in acute colitis. They are considered in the primary prevention of colorectal cancer. The bifidogenic effect of fructo-oligosaccharides merits further attention. Unfermented carbohydrates increase faecal bulk and play a role in the treatment of chronic functional constipation, symptomatic diverticulosis and, possibly, the irritable bowel syndrome. In conclusion, low-digestible carbohydrates may play a role in the maintenance of human digestive health. However, the strength of evidence differs between disease entities.
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Rothman, Stephen, Charles Liebow, and Lois Isenman. "Conservation of Digestive Enzymes." Physiological Reviews 82, no. 1 (January 1, 2002): 1–18. http://dx.doi.org/10.1152/physrev.00022.2001.

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The traditional understanding is that an entirely new complement of digestive enzymes is secreted by the pancreas into the small intestines with each meal. This is thought to be necessary because, like food itself, these enzymes are degraded during digestion. In this review we discuss experiments that bring this point of view into question. They suggest that digestive enzymes can be absorbed into blood, reaccumulated by the pancreas, and reutilized, instead of being reduced to their constituent amino acids in the intestines. This is called an enteropancreatic circulation of digestive enzymes.
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Lebedev, Sviatoslav Valerievich, Elmira Zakievna Gubaidulina, Elena Vladimirovna Sheida, and Victoria Vladimirovna Grechkina. "Exchange (uptake and synthesis) of amino acids in the digestive tract of cattle when used in diet different ingredient composition of the feed." Agrarian Scientific Journal, no. 4 (April 29, 2019): 54–57. http://dx.doi.org/10.28983/asj.y2019i4pp54-57.

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Materials characterizing the role of digestive tract in amino acid metabolism are obtained based on studies assessing the effect of diets with various sources of protein (fish meal, sunflower meal). A number of metabolic regularities (synthesis and assimilation) of amino acids in the digestive tract of an animal follow from the data obtained by us. Сhyme inflowing from the stomach into intestine, contains 1.5-2 times more amino acids, compared with the number of them in the diet. Consequently, the same amount of basic amino acids can be synthesized in the process of digestion of ruminants. Most of amino acids from chyme is digested in the intestine. The actual amount of amino acids digested and included in the metabolism of animal was significantly higher than their content in the eaten dietand reached 108.1 - 148.9% of that received with the diet.
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Longstaff, Margaret, and J. M. McNAB. "The inhibitory effects of hull polysaccharides and tannins of field beans (Vicia faba L.) on the digestion of amino acids, starch and lipid and on digestive enzyme activities in young chicks." British Journal of Nutrition 65, no. 2 (March 1991): 199–216. http://dx.doi.org/10.1079/bjn19910081.

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The effects of polysaccharides and tannins present in the hulls of field beans (Vicia faba L.) on the digestion of amino acids, starch and lipid were studied in poultry. A control diet without hulls and the same diet substituted with 400 g hulls/kg diet from three different varieties of beans were fed to 3-week-old chicks for 4 d. Digestibility coefficients for amino acids, starch and lipid were calculated from measurements made of these nutrients in the diets and the freeze-dried excreta with the aid of titanium dioxide as a marker. Activities of trypsin (EC 3.4.21.4), α-amylase (EC 3.2.1.1), and lipase (EC 3.1.1.3) in digesta removed from the upper jejunum, sucrase (EC 3.2.1.48) in the gut mucosa from the upper jejunum, and α-amylase and lipase in the pancreas were measured. The hulls were analysed for their polysaccharide and tannin contents. Results showed that the hulls were mostly carbohydrate in composition, with cellulose the predominant polysaccharide. Tannins present in the hulls of two coloured-flowering varieties (Brunette and Minica) were of the condensed type. The diet with tannin-free hulls (white-flowering variety Medes) lowered slightly the digestion of amino acids, starch and lipid compared with the control diet. This effect was believed to be due to inhibition of digestive enzymes, possibly through their adsorption onto the hulls. Diets with tannin-rich hulls (varieties Brunette and Minica) caused a large reduction in the digestion of amino acids, starch and lipid compared with the control diet mainly due to inactivation of digestive enzymes by the formation of tannin–enzyme complexes in the digestive tract. Enzyme activities could be partially restored by the addition of polyvinylpyrrolidone to the digesta. Tannins inactivated trypsin the most, α-amylase to a lesser extent and lipase the least and as a consequence lowered the digestion of amino acids the most, starch to a lesser extent and lipid the least. Tannins did not induce an increased pancreatic production of digestive enzymes, nor did they affect activity of jejunum mucosal sucrase. Condensed tannins from Brunette and Minica hulls were partially extractable in methanol alone, but required acidic methanol for fuller extraction. The vanillin: anthocyanidin ratio suggested that tannins were polymerized to the same degree in the Brunette and Minica varieties, both in the methanol and acidic methanol extracts. Hulls from the variety Minica contained a greater amount of methanol-extractable tannins, the quantity of remaining tannins that required acidic methanol for extraction being the same for both varieties.
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Stevens, J., I. Chivers, D. Symons, and K. Dixon. "Acid-digestion improves native grass seed handling and germination." Seed Science and Technology 43, no. 2 (August 1, 2015): 313–17. http://dx.doi.org/10.15258/sst.2015.43.2.19.

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Taghizadeh, A. T., B. Najafnejad, and R. Noori. "Evaluation of nutritive value of tropical clover (Trifolium resupinatum) using gas production technique." Proceedings of the British Society of Animal Science 2007 (April 2007): 217. http://dx.doi.org/10.1017/s1752756200021207.

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Gas measurement provides a useful data on digestion kinetics of both soluble and insoluble fractions of feedstuffs (Getachew et al., 1998). Carbohydrate portion of each feed is divided into three digestible fraction: the A fraction, containing sugars, short oligosaccharides, and organic acids; the B1 fraction, containing starch and pectin; and B2, the digestible fibre fraction (Doane et al. 1998). The objective of this study was to measure of fermentation parameters of tropical clover (Trifolium resupinatum) (pre bud, full bud, pre bloom and full bloom) using gas production technique.
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Larder, Christina E., Michèle M. Iskandar, and Stan Kubow. "Dynamic Multi-Stage Gastrointestinal Digestion Model Assessment of Microbial Fermentation Products of Collagen Hydrolysates." Proceedings 61, no. 1 (October 30, 2020): 12. http://dx.doi.org/10.3390/iecn2020-06998.

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Proteins, peptides and amino acids (AAs) that bypass upper gastrointestinal (GI) digestion can be fermented in the colonic regions. This could lead to microbial production of health promoting short-chain fatty acids (SCFAs). Nitrogenous compounds can also be fermented to generate potentially harmful branched chain fatty acids (BCFAs). As collagen hydrolysate (CH) supplements contain a high peptide content, we evaluated whether peptides that undergo intestinal CH digestion and microbial fermentation can generate SCFAs and BCFAs. Two bovine-sourced CH formulations (CH-GL and CH-OPT) underwent digestive processes and microbial fermentation for 24 h in a dynamic GI digestion model containing human fecal matter. After 24 h, CH-OPT showed a significant (p < 0.05) increase in SCFAs (propionic, butyric and valeric acids) in the ascending colonic vessel with no changes observed with CH-GL. Only CH-OPT showed a significant (p < 0.05) increase in BCFAs, also noted in the ascending colon. No significant (p < 0.05) changes to SCFAs and BCFAs were observed in the transverse and descending colons for both CHs. These findings demonstrate that CHs can induce microbial production of SCFAs and BCFAs although this appears to depend on the CH tested. More studies are needed to determine the physiological significance of these microbial metabolites from intake of CH supplements.
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Vong, M. H., and M. L. Stewart. "In vitro bacterial fermentation of tropical fruit fibres." Beneficial Microbes 4, no. 3 (September 1, 2013): 291–95. http://dx.doi.org/10.3920/bm2013.0006.

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Tropical fruits such as mango, papaya, pineapple and banana are rich sources of dietary fibre. However, few studies have examined the potential physiological effects of fibre from these tropical fruits. The aim of this study was to characterise the fermentability of dietary fibre found in banana, papaya, pineapple and mango as an estimate of the physiological effects of consuming these fruits. Freeze-dried fruit was subjected to in vitro digestion to remove digestible carbohydrates. Digestion residues were freeze-dried prior to fermentation. In vitro fermentation was carried for 24 h under anaerobic conditions to simulate conditions in the large intestine. Gas volume, pH and short chain fatty acids (SCFAs) concentration were measured at 0, 4, 8, 12, and 24 h. SCFAs were analysed by gas chromatography. There was no gas production from 0 to 8 h time points for all samples. Mango fibre resulted in more gas at 12 and 24 h than pineapple, papaya and banana fibres. The slurry pH was significantly lower for mango fibre at 12 and 24 h compared to other samples. Mango fibre resulted in significantly more propionate at 8 h compared to papaya and pineapple fibres. Butyrate concentrations were only significantly different at 4 h. At 24 h total and individual SCFA production did not differ among samples. All fruit fibres were fermentable, with mango fibre being the most rapidly fermented. Additional work is necessary to confirm a benefit on digestive health.
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Dissertations / Theses on the topic "Digestione acida"

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Frignani, Ilaria. "Tecniche di riduzione della quantità di rifiuti prodotti dall’attività di estrazione petrolifera e contenenti NORM (Naturally Occurring Radioactive Materials)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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I rifiuti prodotti dall'estrazione petrolifera si presentano come incrostazioni o fanghi oleosi e viscosi, che si formano all'interno delle tubazioni e dei condotti nelle riserve petrolifere, soprattutto in prossimità di angoli e gomiti. Il loro contenuto radioattivo è di origine naturale ed è composto principalmente da Ra-226. A causa dell'elevata quantità di materiale che supera i valori limite di 10 Bq/g, i NORM (Naturally Occurring Radioactive Materials) rappresentano un notevole problema di rifiuto per l'industria petrolifera. In questo elaborato si descrivono le proprietà dei materiali NORM ed il metodo della riduzione del volume di incrostazione oleosa. Inoltre si sviluppa il metodo di digestione acida, analizzando i rifiuti NORM. Lo scopo delle attività di laboratorio è quello di cercare di ridurre la quantità dei rifiuti prodotti dall'estrazione di petrolio, concentrando la radioattività in un'unica fase. Una prova è stata svolta sul campione tal quale, mentre l'altra è stata eseguita sottoponendo il campione ad un pre-trattamento termico. Infine sono stati descritti alcuni metodi di smaltimento relativi ai rifiuti NORM.
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Trotta, Ronald. "Biological Abnormalities in the Ruminant Small Intestine and Its Relationship to Carbohydrate Assimilation." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/31722.

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Several biological abnormalities exist between the ruminant and nonruminant small intestine and influences carbohydrate assimilation. Two experiments were conducted to identify potential mechanisms to improve carbohydrate utilization in cattle. Experiment 1 evaluated the effects of duodenal starch infusions with casein or glutamic acid on post-ruminal carbohydrase activities. Experiment 2 evaluated the effects of dietary fructose on visceral organ development and expression of nutrient transporters and digestive enzymes involved in carbohydrate assimilation. In experiment 1, the results suggest that small intestinal starch digestion may be improved in cattle with increased small intestinal flow of casein through increases in post-ruminal carbohydrase activities. In experiment 2, dietary fructose supply influenced nutrient utilization, visceral organ growth, and digestive enzyme mRNA expression and activity in neonatal calves.
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Turgeon, Jean-François. "Digestion of titaniferous slags with sulphuric acid." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56951.

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Digestion of titaniferous slag (Sorelslag) with sulphuric acid was studied in an effort to optimise the process and develop a better understanding of its chemistry.
Thermodynamic analysis of the digestion reaction was performed using the program F*A*C*T. A laboratory reactor was built to simulate the operation of an industrial slag digestion reactor. Microstructure examinations of digestion samples revealed the main phases present.
Statistically designed experiments using the Box-Behnken technique were performed in the laboratory to correlate the responses (digestion yield, maximum temperature, solidification time, degree of Ti$ sb2$O$ sb3$ oxidation, sulphuric acid loss in the gas, active acid/titanium ratio and cake height) to the four experimental variables (particle size of the slag, acid concentration, acid/slag weight ratio and baking time).
Model equations successfully tested were obtained for each response. The analysis of the figures obtained from those equations revealed the relative importance of the variables evaluated. In complement to these experimental results the qualitative mass and heat balances were calculated.
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Qian, Cheng. "Effect of Long-Chain Fatty Acids on Anaerobic Digestion." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23778.

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An investigation was carried out to study whether long-chain fatty acids (LCFAs) have an effect on digestion of waste sludge under anaerobic conditions. Four different kinds of LCFAs were used in this study. The 18 carbon series with 0, 1, 2 and 3 double bonds were studied to evaluate the degree of saturation on fatty acid degradation. Due to their molecular structure, unsaturated LCFAs are more soluble than saturated LCFAs. Oleic, linoleic, linolenic acid with an ascending number of double bonds were tested as representatives for three different degrees of saturation. In addition, stearic acid, a saturated fatty acid was also tested. LCFAs were added to sewage sludge at concentrations ranging from 5% to 20% on a weight basis and the pH, solids reduction and COD reduction were determined. The results suggested that in addition to degrading in the digesters, all unsaturated acids contributed additional solids removal, compared to the control group. In contrast, stearic acid did not affect the solids removal. The COD reduction was similar to solids reduction in that additional COD was destroyed when unsaturated LCFAs were added to the sludge. The mechanism for additional solids reduction is not known.
Master of Science
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Varin, Ross A. III. "Acid-phase and Two-phase Codigestion of FOG in Municipal Wastewater." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23210.

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Acidogenic codigestion of fats, oils, and greases (FOG) was studied at 37"C using suspended sludge digesters operated as sequencing batch reactors (SBRs). Volatile fatty acid (VFA) production was found to increase with larger FOG loading rates, although this increase was insignificant compared the theoretical VFA production from FOG addition. Long chain fatty acids (LCFAs) were found to have accumulated in the reactor vessel in semi-solid balls that were primarily composed of saturated LCFAs. Adding high FOG loadings to an APD not acclimated to LCFAs allowed for a mass balance calculation and resulted in near complete saturation of unsaturated LCFAs and significant accumulation of LCFA material in the digester, which was found to be mostly 16:0, 18:0, and 18:1. While 18:2 and 18:3 LCFAs were nearly completely removed, 18:0 and 14:0 LCFAs were produced, most likely from the degradation of 18:2 and 18:3 LCFAs. The APD pH was found to have a significant impact on the amount of accumulated LCFA material present, with higher pH levels resulting in less accumulated material. Two-phase codigestion of FOG was also studied using an APD followed by gas-phase (GPD) digesters. The two-phase systems were compared by FOG addition to the APD versus GPD. FOG addition to the APD resulted in 88% destruction of LCFAs, whereas FOG addition to the GPD resulted in 95% destruction of LCFAs. Accumulated LCFAs in the APD receiving FOG were composed mostly of stearic acid (18:0). The low pH of the APD is likely the cause of LCFA accumulation due to saturation of unsaturated LCFAs.
Master of Science
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McIntosh, Karen Bonnie. "Volatile fatty acid production during thermophilic aerobic digestion pre-treatment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/MQ32185.pdf.

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Rodríguez, Sánchez Raquel. "Use of acid oils in broiler chicken diets." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/666880.

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Los aceites ácidos son co-productos que derivan del proceso de refinación de los aceites para consumo humano (oleínas; aceites ácidos de refinación química y ácidos grasos destilados de refinación física). Se caracterizan por presentar un perfil en ácidos grasos (AG) similar al de los aceites crudos de los que derivan, pero se diferencian en su estructura molecular, ya que tienen un alto contenido en ácidos grasos libres (AGL), lo que puede afectar a su valor nutricional. El objetivo de la presente tesis es profundizar en el estudio de los procesos de digestión y absorción de la grasa en pollos de carne y determinar cómo se ven afectados por el nivel de saturación y nivel de AGL de la dieta y edad de los pollos. El primer ensayo (Capítulo 3) se llevó a cabo con el fin de evaluar el efecto del grado de saturación de la dieta y edad del pollo (14 d y 35 d) sobre los procesos de digestión y absorción de la grasa. Para ello se utilizaron dietas con un 6% de aceite crudo de soja y aceite crudo de palma. El segundo ensayo (Capítulos 4 y 5) se llevó a cabo para estudiar el efecto del nivel de AGL y grado de saturación de la dieta, así como también de la edad (14 d y 37 d) sobre los procesos de digestión y absorción de la grasa. Se utilizaron ocho dietas experimentales con dos grados de saturación (derivados del aceite de soja como fuente insaturada y del aceite de palma como fuente saturada) y cuatro niveles de acidez (5%, 15%, 35% y 50%). Para ello, se combinaron dos aceites crudos y dos co-productos ricos en AGL (oleínas). En ambos estudios se determinó la digestibilidad de los AG y el contenido en fracciones lipídicas a lo largo del tracto gastrointestinal (TGI; molleja, duodeno, yeyuno e íleon) y excreta. Los resultados demuestran que el yeyuno es el principal lugar de absorción de los AG y que la absorción está más afectada por la edad, grado de saturación y nivel de AGL de la dieta que la hidrólisis. La mayor utilización de las dietas insaturadas se confirmó tanto en pollos jóvenes como adultos y se relacionó con una mayor capacidad de absorción de los AG saturados a nivel del íleon. La mejora en la utilización de la grasa en pollos adultos se relacionó con una mayor absorción de los AG a nivel de yeyuno. Los resultados también evidencian que los pollos adultos (37 d) se vieron menos afectados por el nivel de AGL en la dieta que los pollos jóvenes (14 d), debido a que en los primeros la absorción de los AG a nivel de yeyuno fue más eficiente. Otro hallazgo interesante es que el aceite crudo de soja podría ser parcialmente reemplazado por el aceite ácido de soja de refinación química , cómo grasa alternativa, siempre y cuando no se supere el 15% y 35% de AGL en dietas de inicio y crecimiento-acabado, respectivamente. Por otro lado, no se observaron diferencias destacables entre los resultados obtenidos con dietas saturadas con 50% y 5% de AGL, lo que lleva a sugerir que el aceite ácido de palma (ácidos grasos destilados de refinación física de palma) podría reemplazar el aceite crudo de palma en dietas de crecimiento-acabado, al menos cuando no se supera el 50% de AGL de la dieta, sin que se produzcan repercusiones negativas sobre la utilización de la grasa de la dieta.
Acid oils, fat by-products from the edible oil refining industry, are rich in free fatty acids (FFA), have similar fatty acid (FA) composition to their respective crude oils, but different molecular structures, which can affect their nutritional value. The aim of the present thesis is to study in depth the digestion and absorption of fat in broiler chickens, and determine how the age of the chickens, the saturation degree and the FFA level of dietary fat affect these processes in order to raise recommendations on the use of oils with certain percentages of FFA in the diets with no negative repercussions on fat utilization. The first trial (Chapter 3) was conducted in order to study the effect of the dietary fat saturation degree and age (14 d and 35 d) on the fat digestion and absorption processes. For this purpose the dietary use of crude soybean oil and crude palm oil was studied. The second trial (Chapters 4 and 5) was conducted to assess the effect of the dietary FFA level, fat saturation degree and age (14 d and 37 d) on fat digestion and absorption processes. Two crude oils and two fat by-products from the edible oil refining industry rich in FFA were used in order to produce eight dietary treatments with two different saturation degrees (soybean oil products as unsaturated fat source, and palm oil products as saturated fat source), and four levels of dietary FFA (5%, 15%, 35%, and 50%). In both trials the FA digestibility and lipid class composition were determined along the gastrointestinal tract (GIT; gizzard, duodenum, jejunum, and ileum), and excreta. The results evinced that the absorption process mainly takes place in the jejunum, and is more affected than the hydrolysis process is by the saturation degree and free fatty acid level of dietary fat, as well as by the age of the chicken. The greater utilization of unsaturated diets irrespective of the age was confirmed, which was mainly due to the higher contribution of the ileum, especially to saturated FA absorption. The improvement on fat utilization in adult broiler chickens was due to an increase in the contribution of the jejunum to FA absorption. The results also evinced that adult broiler chickens (37 d) were less affected by the dietary FFA level than young broiler chickens (14 d) were due to a more efficient FA absorption at the jejunum level. Another interesting finding is that crude soybean oil could be partially replaced by acid soybean oil from chemical refining, being a good alternative fat source to be used in broiler chicken diets at least when the dietary FFA level does not exceed 15% and 35% in starter and grower-finisher diets, respectively. On the other hand, the saturated diet with 50% dietary FFA level did not differ from the saturated diet with the lowest dietary FFA level (5%), suggesting that acid palm oil (palm fatty acid distillate) could replace crude palm oil in grower-finisher diets, at least when the FFA level does not exceed 50% with no negative repercussions on fat utilization compared to the use of crude palm oil. Regardless of the age, it was concluded that the FA profile of dietary fat has a bigger impact on fat utilization than the level of dietary FFA.
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8

Petit, Hélène. "Antibioprophylaxie par l'augmentin en chirurgie digestive." Strasbourg 1, 1989. http://www.theses.fr/1989STR15038.

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Prasitkusol, Pornrat. "Metabolism and renal excretion of uric acid and allantoin in sheep and cattle." Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327008.

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Moreira, Cesar M. "Steam hydrolysis and anaerobic digestion of biodegradable (polylactic acid) packaging waste." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025168.

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Books on the topic "Digestione acida"

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A history of gastric secretion and digestion: Experimental studies to 1975. New York: Published for the American Physiological Society by Oxford University Press, 1992.

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Russell, G. M. The rapid acid digestion of activated carbon and resin in a microwave oven. Randburg, South Africa: Council for Mineral Technology, 1986.

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3

Edgell, Kenneth. USEPA method study 37 SW-846 method 3050 acid digestion of sediments, sludges, and soils. Cincinnati, Ohio: U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory, 1989.

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Edgell, Kenneth. USEPA method study 37 SW-846 method 3050 acid digestion of sediments, sludges, and soils. Cincinnati, Ohio: U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory, 1989.

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Edgell, Kenneth. USEPA method study 37 SW-846 method 3050 acid digestion of sediments, sludges, and soils. Cincinnati, Ohio: U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory, 1989.

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Edgell, Kenneth. USEPA method study 37 SW-846 method 3050 acid digestion of sediments, sludges, and soils. Cincinnati, Ohio: U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory, 1989.

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Edgell, Kenneth. USEPA method study 37 SW-846 method 3050 acid digestion of sediments, sludges, and soils. Cincinnati, Ohio: U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory, 1989.

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Lipski, Elizabeth. Digestion connection: The simple, natural plan to combat diabetes, heart disease, osteoporosis, arthritis, acid reflux--and more! [New York]: Rodale Inc., 2013.

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Garbarino, John R. Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--comparison of a nitric acid in-bottle digestion procedure to other whole-water digestion procedures. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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Garbarino, John R. Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory: Comparison of a nitric acid in-bottle digestion procedure to other whole-water digestion procedures. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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Book chapters on the topic "Digestione acida"

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Honda, Akira, Tadashi Ikegami, and Yasushi Matsuzaki. "Intestinal Digestion and Absorption." In Bile Acids in Gastroenterology, 27–41. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56062-3_3.

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Borgström, B. "Fat Digestion and Solubilisation." In Bile Acids in Health and Disease, 217–28. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1249-6_17.

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Wu, Guoyao. "Protein Digestion and Absorption of Peptides and Amino Acids." In Amino Acids, 67–116. 2nd ed. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003092742-2.

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Hurst, G., M. Peeters, and S. Tedesco. "Integration of Catalytic Biofuel Production and Anaerobic Digestion for Biogas Production." In Springer Proceedings in Energy, 125–31. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_16.

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AbstractThe drive towards a low carbon economy will lead to an increase in new lignocellulosic biorefinery activities. Integration of biorefinery waste products into established bioenergy technologies could lead to synergies for increased bioenergy production. In this study, we show that solid residue from the acid hydrolysis production of levulinic acid, has hydrochar properties and can be utilised as an Anaerobic Digestion (AD) supplement. The addition of 6 g/L solid residue to the AD of ammonia inhibited chicken manure improved methane yields by +14.1%. The co-digestion of biorefinery waste solids and manures could be a promising solution for improving biogas production from animal manures, sustainable waste management method and possible form of carbon sequestration.
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Zentler-Munro, P. L., D. R. Fine, and T. C. Northfield. "Fat Digestion and Solubilisation in Disease." In Bile Acids in Health and Disease, 239–51. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1249-6_19.

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Kaibara, Nobuaki, and Shigemasa Koga. "Bile Acid as a Causative Factor of Carcinoma." In Digestive Tract Tumors, 229–33. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-5149-8_31.

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Davenport, Horace W. "Secretion of Hydrochloric Acid." In A History of Gastric Secretion and Digestion, 3–75. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4614-7602-3_1.

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Schwitzguébel, J. P., and P. Péringer. "Anaerobic Digestion of Proteins, Peptides and Amino Acids." In Microbiology and Biochemistry of Strict Anaerobes Involved in Interspecies Hydrogen Transfer, 471–72. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-0613-9_63.

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Tang, Zhiru, Zheng Ruan, and Yulong Yin. "Development of Digestive Glands in Pigs." In Nutritional and Physiological Functions of Amino Acids in Pigs, 19–28. Vienna: Springer Vienna, 2013. http://dx.doi.org/10.1007/978-3-7091-1328-8_2.

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Uludag-Demirer, Sibel, Wei Liao, and Goksel N. Demirer. "Volatile Fatty Acid Production from Anaerobic Digestion of Organic Residues." In Methods in Molecular Biology, 357–67. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9484-7_20.

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Conference papers on the topic "Digestione acida"

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Hegde, Swati, Shwe Sin Win, and Thomas A. Trabold. "Stabilizing the Anaerobic Digestion of Food Waste for Biomethane Production." In ASME 2017 11th International Conference on Energy Sustainability collocated with the ASME 2017 Power Conference Joint With ICOPE-17, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/es2017-3097.

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Anaerobic digestion (AD) is a viable method for conversion of food waste and other organic materials into methane-rich biogas. However, when used at high organic loading rates, using only food waste can lead to an unstable process. Process instability is indicated by frequent changes in pH, and increase in ammonia and hydrogen sulfide concentration. These uncontrolled changes combined with over-production of organic acids can inhibit biogas production and ultimately lead to digester failure. Therefore, certain co-substrates produced as wastes in the regional food sector were tested as stabilizing agents for food waste digestion with an objective of achieving stable non-manure based digestion. The substrates tested were acid whey, bread, manure, caffeinated drink, paper napkins and apple pomace. The biogas production was increased by 12% in reactors containing bread, by 10% with acid whey, and by 12% when the co-substrate was caffeinated drink. The reactors containing paper and manure showed decreased biogas production by 6% and 12% respectively, but these changes are relatively small and thus not considered inhibitory. Co-digestion with apple pomace was found to be inhibitory and resulted in digester failure. This initial study has demonstrated that the stability of AD systems may be improved by strategically combining available food waste feedstocks.
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Rahim, A. F. A., S. R. M. Kutty, and A. Malakahmad. "Optimization of anaerobic digestion of sludge to produce volatile fatty acids." In ENVIRONMENTAL IMPACT 2014. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/eid140201.

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Laura H Page, Ji-Qin Ni, Albert J Heber, Nathan S Mosier, Xingya Liu, Hung-Soo Joo, Pius M Ndegwa, and Joe H Harrison. "Effect of Anaerobic Digestion on Volatile Fatty Acids in Dairy Manure." In 2012 Dallas, Texas, July 29 - August 1, 2012. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2012. http://dx.doi.org/10.13031/2013.42164.

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Buryakov, Nikolay, Maria Buryakova, and Irina Hardik. "OPTIMIZATION OF CICATRICIAL DIGESTION OF COWS WHEN USING THE "FIBRASE"." In Multifunctional adaptive fodder production. ru: Federal Williams Research Center of Forage Production and Agroecology, 2020. http://dx.doi.org/10.33814/mak-2020-24-72-138-144.

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The species composition and number of microflora, the total amount and diet of volatile fatty acids in the rumen content of experimental animals at the beginning of lactation were studied and the feasibility of using the feed additive "FIBRASE" in feeding lactating cows was determined.
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Bader, Michael, Dankwart Rauscher, Kurt Geibel, and Juergen Angerer. "Biomonitoring of carcinogenic substances: enzymatic digestion of globin for detecting alkylated amino acids." In Environmental Sensing '92, edited by Tuan Vo-Dinh and Karl Cammann. SPIE, 1993. http://dx.doi.org/10.1117/12.140257.

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Asmatulu, R., and V. Movva. "Evaluation of Advanced Composites Using Destructive Testing Techniques." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62754.

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A very basic problem in manufacturing advanced composites is the occurrence of defects, such as voids, delamination, resin rich areas, distorted fibers and foreign material inclusions. Of these defects, voids are the unavoidable defects mostly coming from a variety of reasons, including resin type, poor vacuum source, air entrapment, leakage of vacuum bag and by-products formed during the curing cycle of laminates. These voids seriously affect the mechanical properties of composite panels, and cause severe damages during the service. In the present study, various destructive testing techniques, such as visual, burn-out or ignition loss of cured composites, image analysis and matrix digestion or acid digestive were used on advanced composite panels at various porosity levels (e.g., 0–2%, 3–6% and greater than 7%), and the obtained results were compared each other. Also, testing parameters were optimized using the standard samples to achieve maximum possible error free data of voids, fiber volume, fiber wash, inter laminar and trans laminar cracks, miss-oriented fibers, lay-up orders and latent defects. Optimization of parameters was performed using the design of experiments. We determined that the test results were significantly changed based on the test techniques, composite samples, as well as testing time, operator skill, cost of experimentation, initial equipment cost, pre and post treatments and lack of standardized testing patterns.
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Foster, P. A., C. A. Fulcher, T. Marti, K. Titani, and T. S. Zimmerman. "A FACTOR VIII BINDING DOMAIN RESIDES WITHIN THE AMINO-TERMINAL 272 AMINO ACID RESIDUES OF VON WILLEBRAND FACTOR." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1642875.

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We have identified a Factor VIII (FVIII) binding domain residing within the amino-terminal 272 amino acid residues of the mature von Willebrand Factor (vWF) subunit. Two dimensional crossed immunoelectrophoresis showed direct binding of purified human FVIII to purified human vWF. After proteolytic digestion of vWF with Staphylococcus aureus V8 protease, FVIII binding was seen only with the amino-terminal SP fragment III and not with the carboxy-terminal SP fragment II. A monoclonal anti-vWF antibody (C3) partially blocked FVIII binding to vWF and SP fragment III. FVIII also bound to vWF which had been adsorbed to polystyrene beads. This binding was inhibited in a dose dependent manner by whole vWF, SP fragment III, and by monoclonal antibody C3. Binding could not be inhibited by SP fragment I, which contains the middle portion of the vWF molecule, or by reduced and alkylated whole vWF. SP fragment II caused only minor inhibition. Trypsin cleavage of SP fragment III produced a 35-kDa fragment containing the amino-terminal 272 amino acid residues of vWF. This fragment reacted with monoclonal antibody C3 and inhibited the binding of FVIII to vWF in a dose dependent manner. The other major fragment obtained from this digestion was a two chain hetero-dimer composed of amino acid residues 273-511 and 674-728. This fragment did not inhibit FVIII binding. These studies demonstrate that a major FVIII binding site resides within the first 272 amino acid residues of vWF.
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Edgington, T. S., J. H. Morrissey, and H. Fakhrai. "MOLECULAR CLONING OF HUMAN TISSUE FACTOR cDNA." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643740.

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Tissue factor (TF), the cell-surface receptor and allo-steric activator for factor Vll/VIIa, is important in hemostasis andinflammation. The TF apoprotein was purifiedfrom human brain using factor Vll-affinitychromatography and SDS gel electrophoresis,and was found to consist of a 47 kDa heavy chain plus a 12.5 kDa light chain. Approximately one-third of the heavy chain amino acid sequence was determined for four regions by microsequencing the intact protein and peptides derived from V8-protease digestion. A λgtll cDNA library, made from mRNA derived from the human fibroblastic cell line WI38,was screened with (a) affinity-purified rabbit antibodies to human tissue factor, and (b) a 45-mer oligonucleotide probe based on TF heavy chain amino acid sequence. Five overlapping cDNA clones were identifiedand sequenced which confirmed all four partial TF amino acid sequences. Together these clones span the entire heavy chain coding sequence as well as 5" and 3" nontranslated regions. The N-terminusof the TF heavy chain is preceded by an unusually long signal peptide which appears to be cleaved at alternative sites two amino acids apart. This results in two variants of TF heavy chains which differ slightly in length and amino-terminal sequence.The deduced protein sequence shows no major homology to known protein sequences. However,a relatively uncommon tripeptide sequence, Trp-Lys-Ser (WKS), appears three times in the TF heavy chain. This tripeptidesequence also occurs in HMW kininogen, factor VIII,von Willebrand"s factor andant ithrombin-III. Limited sequence similarity is observed in flanking sequences,andthis may indicate a possible functional domain for the recognition of members ofthe vitamin K-dependent serine protease famil.Supported by NIH grants HL-16411 andCA-41085.
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Takasaki, Rikiya, Lee Chang Yuan, Hirotsugu Kamahara, Youichi Atsuta, and Hiroyuki Daimon. "Effect of acid detergent fiber in hydrothermally pretreated sewage sludge on anaerobic digestion process." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE’17): Sustainable Technology And Practice For Infrastructure and Community Resilience. Author(s), 2017. http://dx.doi.org/10.1063/1.5005697.

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Bouchkira, Ilias, Abderrazak M. Latifi, Lhachmi Khamar, and Saad Benjelloun. "Multi-Objective Optimization of the Digestion Tank of an Industrial Phosphoric Acid Manufacturing Process." In 2020 6th IEEE Congress on Information Science and Technology (CiSt). IEEE, 2020. http://dx.doi.org/10.1109/cist49399.2021.9357206.

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Reports on the topic "Digestione acida"

1

Crippen, M. D. Acid digestion demonstration (WeDID). Office of Scientific and Technical Information (OSTI), November 1993. http://dx.doi.org/10.2172/10116031.

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Sherrill, William M. Effects of Acid Digestion on the Peak Decomposition and Impact Sensitivity of Nitrocellulose. Fort Belvoir, VA: Defense Technical Information Center, August 2011. http://dx.doi.org/10.21236/ada550628.

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Pemberton, R. G., D. Edser, and MRL Gower. Optimisation of acid digestion conditions for volume fraction measurements of hard to digest fibre-reinforced polymer composites. National Physical Laboratory, September 2020. http://dx.doi.org/10.47120/npl.mn12.

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Veldkamp, T., J. W. van Riel, R. A. Dekker, S. Khalaji, V. Khaksar, H. Hashemipour, M. M. van Krimpen, and M. C. Blok. Estimating requirement values for standardised ileal digestible amino acids in broilers by a meta-analysis approach. Wageningen: Wageningen UR Livestock Research, 2016. http://dx.doi.org/10.18174/388691.

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Pool, K. H., C. H. Delegard, A. J. Schmidt, B. M. Thornton, and K. L. Silvers. K Basin Sludge Conditioning Process Testing Project Results from Test 4, ''Acid Digestion of Mixed-Bed Ion Exchange Resin''. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/5108.

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Acid digestion of organic waste. Innovative Technology Summary Report. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/767781.

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