Studies on the Nutrition of Macropodine Marsupials. 3. The Flow of Digesta Through the Stomach and Intestine of Macropodines and Sheep.

1982 ◽  
Vol 30 (5) ◽  
pp. 751 ◽  
Author(s):  
DW Dellow
Keyword(s):  
Tammar Wallaby ◽  
Phalaris Aquatica ◽  
Grey Kangaroo ◽  
Differential Flow ◽  
Tubular Flow ◽  
Mode Of Transport ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

3. The two markers 51chromium EDTA and 103ruthenium were used to examine and compare digesta flow in the eastern grey kangaroo (Macropus giganteus), the red-necked pademelon (Thylogale thetis), the tammar wallaby (M. eugenii), the eastern wallaroo (M. robustus robustus) and in sheep fed on chopped lucerne hay, and in T. thetis and M. eugenii fed on fresh grass (Phalaris aquatica). The markers were also used to define the kinetics of digesta flow in the intestine, and to estimate the flow of fluid and DM through defined regions of the stomach and intestines of T. thetis and M. eugenii fed on the lucerne diet. The pattern of digesta flow and the degree of differential flow of the 2 markers observed in the macropodines differed markedly from those in sheep and were attributed solely to the mode of transport through the elongated stomach. In the macropodines it was apparent that total mixing of forestomach contents did not occur; rather, digesta flowed slowly along the tubiform forestomach. The relationship of this mode of transport, defined as tubular flow, to stomach structure, and the possible effects on digestion in the forestomach, are discussed.

Application of Galvanic Zinc-Iron Coating in the Repair of Transport and Technological Machines

2021 ◽  
Vol 1022 ◽  
pp. 181-193
Author(s):  
Dmitry M. Rozhkov ◽  
Evgenia V. Eltoshkina ◽  
Petr I. Ilyin ◽  
Olga A. Svirbutovich
Keyword(s):  
Experimental Studies ◽  
Iron Alloy ◽  
Resource Saving ◽  
Experimental Base ◽  
Optimal Resource ◽  
Iron Coating ◽  
Saving Mode ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

The article presents the results of experimental studies to determine the relationship between the electrolysis modes and the properties of electroplating coatings for mathematical modeling of the dynamics of the electrolytic process (MDEP), described by a system of ordinary differential equations due to the complex relationship of the kinetics of chemical reactions, hydrodynamics and mass transfer in the electrolyte flow, the kinematics of electrode plates, and the influence of the electric field of the "anode-cathode" pair on all these processes. At the same time, the experimental base was a series of full-scale experiments to restore the seats of the root supports of cylinder blocks with electroplated coatings. The final result of the research is the procedure for constructing an optimal resource-saving mode of electroplating, which is a zinc-iron alloy.

Studies on the Nutrition of Macropodine Marsupials. 1. Intake and Digestion of Lucerne Hay and Fresh Grass, Phalaris Aquatica.

1982 ◽  
Vol 30 (3) ◽  
pp. 391 ◽  
Author(s):  
DW Dellow ◽  
ID Hume
Keyword(s):  
Organic Matter ◽  
Tammar Wallaby ◽  
The Other ◽  
N Balance ◽  
Digestible Energy ◽  
Phalaris Aquatica ◽  
Grey Kangaroo ◽  
Acid Detergent Fibre ◽  
Diet Intake ◽  
Maintenance Requirements

Intake and digestion of chopped lucerne hay was studied in three macropodine species, eastern grey kangaroo Macropus giganteus. red-necked pademelon Thylogale thetis and tammar wallaby M. eugenii, and in sheep. The utilization of fresh Phalaris grass by the two wallaby species T. thetis and M. eugenii was also examined and compared. On the chopped lucerne hay diet, intake of organic matter (OM) was similar in sheep and M. giganteus, but sheep digested more (P<0.05) OM and thus consumed more (P<0.05) digestible energy (DE) than all three macropodine species. Among the macropodines. M. eugenii consumed the least (P<0.01) OM and DE but digested more (P<0.05) OM. However, acid detergent fibre (ADF) digestibility was similar in the three macropodine species and lower (P<0.05) than in sheep. On the fresh grass diet M. eugenii consumed less (P<0.05) OM and DE than T. thetis. ADF digestibility was similar in both species. Although ,M. eugenii consumed less nitrogen (N) than the other three species on the lucerne diet (P<0.01) and less N than T. thetis on the Phalaris diet (P<0.05), N balance was similar and positive in all species. Data from this and other published studies indicate that the maintenance requirements for energy and nitrogen of most macropodines are lower than for sheep, and appear to be lower in M, eugenii than in any other macropodine studied so far. It is also apparent that there are probably few real differences among the Macropodinae in efficiency of fibre digestion, at least on diets of adequate nitrogen and DE content.

Kinetics of aquation of the fluoropentaamminecobalt(III) ion

1970 ◽  
Vol 48 (7) ◽  
pp. 1054-1058 ◽  
Author(s):  
T. W. Swaddle ◽  
W. E. Jones
Keyword(s):  
Ionic Strength ◽  
Rate Coefficient ◽  
Hydrogen Ion ◽  
Fluoride Ion ◽  
Kcal Mole ◽  
First Order ◽  
Order Rate ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

The kinetics of the hydrogen-ion-independent pathway for the replacement of fluoride in aqueous (NH3)5CoF2+ by H2O have been reinvestigated using a specific fluoride-ion electrode, with due regard for the concomitant autocatalytic loss of the ammine ligands. In perchlorate media of ionic strength 0.1 M, the first-order rate coefficient is 1.22 × 10−6 s−1 at 45°, and the kinetics are represented by ΔH* = 24.4 kcal mole−1 and ΔS* = −9 cal deg−1 mole−1 over the range 35–75° at least. The relationship of these data to those for the aquation of other species of the type ML5Xn+ is discussed.

Study on Crystallization Kinetics of Gypsum Prepared by Bittern under 30oC and Different Stirring Speed

2014 ◽  
Vol 962-965 ◽  
pp. 731-735
Author(s):  
Bi Jun Luo ◽  
Dan Wu ◽  
Hai Hong Wu ◽  
Tao Wang ◽  
Xi Ping Huang
Keyword(s):  
Experimental Data ◽  
Crystallization Kinetics ◽  
Calcium Sulfate ◽  
Particle Number ◽  
Particle Number Density ◽  
Crystal Growth Rate ◽  
Number Density ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

Crystallization kinetics experiment of calcium sulfate dehydrates, which is prepared by bittern under 30oC and different stirring speed conditions, is carried out. According to the results of the experimental data, the relationship of nucleus particle-number density n0 and crystal growth rate G with the residence time, temperature and the stirring speed is summarized. Also, the crystallization kinetics formula under 30oC and different stirring speed is given.

scholarly journals Examining the fixation kinetics of chelated and non-chelated copper and the applications to micronutrient management in semiarid alkaline soils

Solid Earth ◽  
2016 ◽  
Vol 7 (1) ◽  
pp. 311-321 ◽  
Author(s):  
T. K. Udeigwe ◽  
M. B. Eichmann ◽  
M. C. Menkiti ◽  
N. Y. O. Kusi
Keyword(s):  
High Plains ◽  
Tetraacetic Acid ◽  
Alkaline Soils ◽  
Order Model ◽  
System Reduction ◽  
Relationship Of ◽  
Future Work ◽  
The Relationship ◽  
Kinetics Of ◽  
Mixed Systems

Abstract. This study examined and compared the fixation and fixation kinetics of copper (Cu) in chelated (ethylene diamine tetraacetic acid, EDTA) and non-chelated mixed systems of micronutrients in the semiarid soils of the Southern High Plains, USA, using findings from Cu extraction studies and kinetic models. Approximately, 22 % more Cu was fixed in the non-chelated system compared to the chelated within the first 14 days with only 7 % difference between the two systems by day 90. Findings suggest a decrease in the effectiveness of chelated micronutrients over time, highlighting the significance of timing even when chelated micronutrients are used. The strengths of the relationship of change in available Cu with respect to other micronutrients (iron (Fe), manganese (Mn), and zinc (Zn)) were higher in the non-chelated system (R2: 0.68–0.94), compared to the chelated (R2: 0.42–0.81), with slopes of 0.40 (Cu–Fe), 0.31 (Cu–Mn), and 1.04 (Cu–Zn) in the non-chelated system and 0.26 (Cu–Fe), 0.22 (Cu–Mn), and 0.90 (Cu–Zn) in the chelated system. Reduction in the amount of available Cu was best described by the power function model (R2 =  0.91, SE  =  0.081) in the non-chelated system and second-order model (R2 =  0.95, SE  =  0.010) in the chelated system. The applications generated from this study could be used as tools for improved micronutrient management and also provide baseline data for future work in other semiarid/arid alkaline soils of the world. Findings are also more applicable to field settings, an improvement over related previous studies.

CO2 homeostasis during periodic breathing in obstructive sleep apnea

2000 ◽  
Vol 88 (1) ◽  
pp. 257-264 ◽  
Author(s):  
Kenneth I. Berger ◽  
Indu Ayappa ◽  
I. Barry Sorkin ◽  
Robert G. Norman ◽  
David M. Rapoport ◽  
...  
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Minute Ventilation ◽  
Periodic Breathing ◽  
Obstructive Sleep ◽  
Interevent Interval ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of ◽  
Ventilation And Perfusion

The contribution of apnea to chronic hypercapnia in obstructive sleep apnea (OSA) has not been clarified. Using a model (D. M. Rapoport, R. G. Norman, and R. M. Goldring. J. Appl. Physiol. 75: 2302–2309, 1993), we previously illustrated failure of CO2 homeostasis during periodic breathing resulting from temporal dissociation between ventilation and perfusion (“temporal V˙/Q˙mismatch”). This study measures acute kinetics of CO2 during periodic breathing and addresses interapnea ventilatory compensation for maintenance of CO2 homeostasis in 11 patients with OSA during daytime sleep (37–171 min). Ventilation and expiratory CO2 and O2 fractions were measured on a breath-by-breath basis by means of a tight-fitting full facemask. Calculations included CO2excretion, metabolic CO2production, and CO2 balance (metabolic CO2 production − exhaled CO2). CO2 balance was tabulated for each apnea/hypopnea event-interevent cycle and as a cumulative value during sleep. Cumulative CO2 balance varied (−3,570 to +1,388 ml). Positive cumulative CO2 balance occurred in the absence of overall hypoventilation during sleep. For each cycle, positive CO2 balance occurred despite increased interevent ventilation to rates as high as 45 l/min. This failure of CO2 homeostasis was dependent on the event-to-interevent duration ratio. The results demonstrate that 1) periodic breathing provides a mechanism for acute hypercapnia in OSA, 2) acute hypercapnia during periodic breathing may occur without a decrease in average minute ventilation, supporting the presence of temporalV˙/Q˙ mismatch, as predicted from our model, and 3) compensation for CO2 accumulation during apnea/hypopnea may be limited by the duration of the interevent interval. The relationship of this acute hypercapnia to sustained chronic hypercapnia in OSA remains to be further explored.

Researching Dance in the Wild: Brazilian Experiences

2007 ◽  
Vol 51 (3) ◽  
pp. 140-155
Author(s):  
Christine Greiner
Keyword(s):  
Facial Expression ◽  
Cognitive Science ◽  
Gilles Deleuze ◽  
Practical Philosophy ◽  
Political Conception ◽  
The Face ◽  
In The Wild ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

The final installment of a continuing series on choreography considering the mutual interrogation of philosophy and dance, the articles propose a tentative ethics of dance as a “practical philosophy” under the influence of Gilles Deleuze read through specific choreographic practices. Gerald Siegmund describes his private experience of Boris Charmatz's choreographic machine as a metaphor for the entrapment of theatre and as generative of new bodily subjectivities. Introducing anthropological applications of cognitive science to the particular strategies of choreographers working in Brazil, Christine Greiner argues for a political conception of self through dance. Examining the kinetics of the face in RoseAnne Spradlin's Survive Cycle, Victoria Anderson Davies meditates on the relationship of facial expression to language, to consciousness, and to movement.

Machines, Faces, Neurons: Towards an Ethics of Dance

2007 ◽  
Vol 51 (3) ◽  
pp. 118-123 ◽  
Author(s):  
André Lepecki
Keyword(s):  
Facial Expression ◽  
Cognitive Science ◽  
Gilles Deleuze ◽  
Practical Philosophy ◽  
Political Conception ◽  
The Face ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

The final installment of a continuing series on choreography considering the mutual interrogation of philosophy and dance, the articles propose a tentative ethics of dance as a “practical philosophy” under the influence of Gilles Deleuze read through specific choreographic practices. Gerald Siegmund describes his private experience of Boris Charmatz's choreographic machine as a metaphor for the entrapment of theatre and as generative of new bodily subjectivities. Introducing anthropological applications of cognitive science to the particular strategies of choreographers working in Brazil, Christine Greiner argues for a political conception of self through dance. Examining the kinetics of the face in RoseAnne Spradlin's Survive Cycle, Victoria Anderson Davies meditates on the relationship of facial expression to language, to consciousness, and to movement.

Creative Endurance and the Face Machine: RoseAnne Spradlin's Survive Cycle

2007 ◽  
Vol 51 (3) ◽  
pp. 156-166 ◽  
Author(s):  
Victoria Anderson Davies
Keyword(s):  
Facial Expression ◽  
Cognitive Science ◽  
Gilles Deleuze ◽  
Practical Philosophy ◽  
Political Conception ◽  
The Face ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of

The final installment of a continuing series on choreography considering the mutual interrogation of philosophy and dance, the articles propose a tentative ethics of dance as a “practical philosophy” under the influence of Gilles Deleuze read through specific choreographic practices. Gerald Siegmund describes his private experience of Boris Charmatz's choreographic machine as a metaphor for the entrapment of theatre and as generative of new bodily subjectivities. Introducing anthropological applications of cognitive science to the particular strategies of choreographers working in Brazil, Christine Greiner argues for a political conception of self through dance. Examining the kinetics of the face in RoseAnne Spradlin's Survive Cycle, Victoria Anderson Davies meditates on the relationship of facial expression to language, to consciousness, and to movement.

Heavy Metals (Cu and Zn) Release Kinetics in a Sediment Sample from the Inlet of Baihua Lake, China

2012 ◽  
Vol 599 ◽  
pp. 81-85
Author(s):  
Ji Ping Zhang ◽  
Ji Wei Hu ◽  
Xian Fei Huang ◽  
Jin Mei ◽  
Wei Shen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sediment Sample ◽  
Ph Value ◽  
Release Kinetics ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of ◽  
Best Fit ◽  
Metals Release ◽  
Cu And Zn

Release kinetics of two selected heavy metals (Cu and Zn) in a sediment sample collected from the inlet of Baihua Lake was determined. The results show that the double-constant equation was considered as the best-fit equations describing the relationship of Cu and Zn release and time in the sediment from the inlet of the lake (R2 = 0.9759, 0.9226, P<0.01). The effects of temperature, acidity, salinity, and the water/soil ratio on the releasing of heavy metals in sediment sample were also investigated. The heavy metals release would increase as the temperature increased. A low pH value could promote the heavy metals release. The heavy metals in the sediment tended to be released under a relatively high salinity condition. The amount of the heavy metals released from the sediment decreased with the increase of the water/soil ratio.

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