Search Results - "Weimer, P. J"

Quantitative analysis of growth and volatile fatty acid production by the anaerobic ruminal bacterium Megasphaera elsdenii T81 by Weimer, P. J., Moen, G. N.

“…Megasphaera elsdenii T81 grew on either dl -lactate or d -glucose at similar rates (0.85 h −1 ) but displayed major differences in the fermentation of these…”
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Host specificity of the ruminal bacterial community in the dairy cow following near-total exchange of ruminal contents by Weimer, P J, Stevenson, D M, Mantovani, H C, Man, S L C

“…The purpose of this study was to examine the stability and host specificity of a cow's ruminal bacterial community following massive challenge with ruminal…”
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Comparative study of SPORL and dilute-acid pretreatments of spruce for cellulosic ethanol production by Shuai, L., Yang, Q., Zhu, J.Y., Lu, F.C., Weimer, P.J., Ralph, J., Pan, X.J.

“…The performance of two pretreatment methods, sulfite pretreatment to overcome recalcitrance of lignocellulose (SPORL) and dilute acid (DA), was compared in…”
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Effects of ruminal dosing of Holstein cows with Megasphaera elsdenii on milk fat production, ruminal chemistry, and bacterial strain persistence by Weimer, P J, Da Silva Cabral, L, Cacite, F

“…Megasphaera elsdenii is a lactate-utilizing bacterium whose ruminal abundance has been shown to be greatly elevated during milk fat depression (MFD). To…”
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Shifts in bacterial community composition in the rumen of lactating dairy cows under milk fat-depressing conditions by Weimer, P J, Stevenson, D M, Mertens, D R

“…Eighteen ruminally cannulated dairy cattle were fed a series of diets (in 28-d periods) designed to elicit different degrees of milk fat depression (MFD) for…”
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Fermentation of alfalfa wet-fractionation liquids to volatile fatty acids by Streptococcus bovis and Megasphaera elsdenii by Weimer, P.J., Digman, M.F.

“…•Alfalfa juice is rich in sugars, starch and a recoverable protein fraction.•Streptococcus bovis enhanced fermentation of alfalfa juice to lactic…”
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pH dynamics and bacterial community composition in the rumen of lactating dairy cows by Palmonari, A, Stevenson, D M, Mertens, D R, Cruywagen, C W, Weimer, P J

“…The influence of pH dynamics on ruminal bacterial community composition was studied in 8 ruminally cannulated Holstein cows fitted with indwelling electrodes…”
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Individual animal variability in ruminal bacterial communities and ruminal acidosis in primiparous Holstein cows during the periparturient period by Mohammed, R, Stevenson, D M, Weimer, P J, Penner, G B, Beauchemin, K A

“…The purpose of this study was to investigate variability among individual cows in their severity of ruminal acidosis (RA) pre- and postpartum, and determine…”
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Changes in ruminal bacterial community composition following feeding of alfalfa ensiled with a lactic acid bacterial inoculant by Mohammed, R, Stevenson, D M, Beauchemin, K A, Muck, R E, Weimer, P J

“…Some silage inoculants help to improve silage quality and promote an increase in milk production, possibly through altering the rumen microflora. We…”
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Symposium review: Host-rumen microbe interactions may be leveraged to improve the productivity of dairy cows by Bickhart, D M, Weimer, P J

“…The rumen is a large bioreactor that enables dairy cattle to derive nutrition from otherwise indigestible plant polymers and compounds. Despite the direct…”
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Characterization, Genetic Variation, and Combining Ability of Maize Traits Relevant to the Production of Cellulosic Ethanol by Lorenz, A.J, Coors, J.G, De Leon, N, Wolfrum E.J, Hames, B.R, Sluiter, A.D, Weimer, P.J

“…Maize (Zea mays L.) stover has been identified as an important feedstock for the production of cellulosic ethanol. Our objectives were to measure hybrid effect…”
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Sucrose concentration alters fermentation kinetics, products, and carbon fates during in vitro fermentation with mixed ruminal microbes by Hall, M. B, Weimer, P. J

“…Effects of sucrose (Suc) concentration on fermentation kinetics and products were evaluated using 3 concentrations of Suc, with 1 concentration of isolated NDF…”
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Fermentability of eastern gamagrass, big bluestem and sand bluestem grown across a wide variety of environments by Weimer, P.J., Springer, T.L.

“…Plant biomass has attracted interest as a feedstock for biofuels production, but much of this work has been focused on relatively few plant species. In this…”
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In vitro ruminal fermentation of treated alfalfa silage using ruminal inocula from high and low feed‐efficient lactating cows by Contreras‐Govea, F.E., Muck, R.E., Weimer, P.J., Hymes‐Fecht, U.C.

“…Aims To assess the effect of two additives on alfalfa silage and on in vitro ruminal fermentation when using ruminal inocula from high feed‐efficient (HE) and…”
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Fiber digestion, VFA production, and microbial population changes during in vitro ruminal fermentations of mixed rations by monensin-adapted and unadapted microbes by Weimer, P.J., Stevenson, D.M., Mertens, D.R., Hall, M.B.

“…Mixed ruminal microbes were incubated for 24 h in vitro with mixed forage and concentrate rations under conditions that differed in starch level (200 or 300…”
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survival of silage inoculant lactic acid bacteria in rumen fluid by Weinberg, Z.G, Muck, R.E, Weimer, P.J

“…Aims: To determine whether lactic acid bacteria (LAB) used in inoculants for silage can survive in rumen fluid (RF), and to identify those that survive best…”
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In vitro gas production as a surrogate measure of the fermentability of cellulosic biomass to ethanol by Weimer, P.J, Dien, B.S, Springer, T.L, Vogel, K.P

“…Current methods for measuring ethanol yields from lignocellulosic biomass are relatively slow and are not well geared for analyzing large numbers of samples…”
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Initial pH as a determinant of cellulose digestion rate by mixed ruminal microorganisms in vitro by Mouriño, F, Akkarawongsa, R, Weimer, P J

“…In vitro fermentations of pure cellulose by mixed ruminal microorganisms were conducted under conditions in which pH declined within ranges similar to those…”
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Isolation and characterization of a Trichoderma strain capable of fermenting cellulose to ethanol by STEVENSON, D. M, WEIMER, P. J

“…The direct fermentation of cellulosic biomass to ethanol has long been a desired goal. To this end, we screened the environment for fungal strains capable of…”
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Effect of diet on populations of three species of ruminal cellulolytic bacteria in lactating dairy cows by Weimer, P J, Waghorn, G C, Odt, C L, Mertens, D R

“…The effects of four contrasting diets were determined on populations of three species of ruminal cellulolytic bacteria (Ruminococcus albus, Ruminococcus…”
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