The effect of ruminal phosphate concentration on the absorption of calcium, phosphorus and magnesium from the reticulo-rumen of the sheep

1. The absorption rates of calcium, inorganic phosphate (P1) and magnesium were determined from buffered solutions placed in the temporarily isolated and washed reticulo-rumen of conscious sheep. The basic composition of these solutions was similar to that found in supernatant fractions of ultracentrifuged rumen contents.2. The Pi concentrations studied in these solutions were 2, 8·7, 14, 17·3 and 38 mmol/l. The initial concentration of Ca was 2·0 mmol/l and that of Mg was 2.5 mmol/l in all experiments.3. Increasing the Pi concentration in the rumen solution from 2 to 38 mmol/l resulted in increases in the net absorption rates of both Ca and Pi, and a decrease in the potential difference across the wall of the rumen.4. Similarly, increasing the Pi concentration from 2 to 17·3 mmol/l resulted in an increase in the net absorption rate of Mg from the rumen.5. Mineral analysis of strained rumen fluid or a 30000 g centrifugate of strained rumen fluid revealed a reduced Pi concentration in sheep fed on frozen spring grass as opposed to the pellet + hay diet. The values obtained were within the range studied.

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Chemical form of inorganic phosphate in sheep faeces

Soil Research ◽

10.1071/sr9750063 ◽

1975 ◽

Vol 13 (1) ◽

pp. 63 ◽

Cited By ~ 11

Author(s):

NJ Barrow

Keyword(s):

Calcium Carbonate ◽

Inorganic Phosphate ◽

Solubility Diagram ◽

Chemical Form ◽

Phosphate Concentration ◽

Dicalcium Phosphate ◽

Initial Concentration

A sample of sheep faeces was shaken with solutions which differed in initial concentration, of acid, of phosphate or of calcium. Measurements of calcium and of phosphate concentration and of pH were then made and used to construct a solubility diagram. This indicated that the phosphate was present as dicalcium phosphate and that calcium carbonate was also present. This appears to be consistent with published observations on the availability of faecal phosphate to plants.

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PLASMA INORGANIC PHOSPHATE CONCENTRATION AND HYPERVENTILATION IN THE DOG

American Journal of Physiology-Legacy Content ◽

10.1152/ajplegacy.1948.154.2.185 ◽

1948 ◽

Vol 154 (2) ◽

pp. 185-187 ◽

Cited By ~ 1

Author(s):

Gilbert S. Campbell ◽

E. B. Brown ◽

Frank Gollan

Keyword(s):

Inorganic Phosphate ◽

Phosphate Concentration

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The Effect of Calcium and Phosphate on the Biphasic Calcium Uptake by the Sarcoplasmic Reticulum

Zeitschrift für Naturforschung C ◽

10.1515/znc-1975-11-1214 ◽

1975 ◽

Vol 30 (11-12) ◽

pp. 777-780 ◽

Cited By ~ 9

Author(s):

Pierre Ermier ◽

Wilhelm Hasselbach

Keyword(s):

Sarcoplasmic Reticulum ◽

Inorganic Phosphate ◽

Calcium Uptake ◽

Initial Rate ◽

Maximum Amplitude ◽

Phosphate Concentration ◽

Free Calcium ◽

Physiological Range ◽

External Calcium

Abstract The amplitude of the fast uptake and the initial rate of the slow uptake increase with in creasing free calcium concentrations, up to 30 μᴍ. In that range, both processes are correlated to each other. At higher concentrations, the slow uptake is more inhibited than the fast uptake. The fast uptake shows a maximum amplitude which remains unchanged in the presence of phosphate. The slow uptake leads to a nearly complete depletion of the external calcium, and its rate is proportional to the phosphate concentration, even at physiological range. The sarcoplasmic ATPase liberates inorganic phosphate and the slow uptake

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POLYHYDRIC ALCOHOL PRODUCTION BY OSMOPHILIC YEASTS: EFFECT OF OXYGEN TENSION AND INORGANIC PHOSPHATE CONCENTRATION

Canadian Journal of Microbiology ◽

10.1139/m57-061 ◽

1957 ◽

Vol 3 (4) ◽

pp. 559-567 ◽

Cited By ~ 25

Author(s):

J. F. T. Spencer ◽

Ping Shu

Keyword(s):

Oxygen Tension ◽

Inorganic Phosphate ◽

Opposite Effect ◽

Ethanol Yield ◽

Phosphate Concentration ◽

Alcohol Production ◽

Lower Oxygen ◽

Oxygen Tensions ◽

Effect Of Oxygen ◽

Very High

A study was made of the effects of oxygen tension and inorganic phosphate concentration on the production of glycerol, arabitol, and ethanol by a strain of osmophilic yeast. Increasing the oxygen tension increased the yields of glycerol and arabitol and decreased the yield of ethanol, while increasing the concentration of inorganic phosphate had the opposite effect.The changes in yields of products with increasing phosphate concentration were most pronounced at a partial pressure of oxygen of 280 mm. of mercury. At lower oxygen tensions the yields of polyols were low and the yield of ethanol was high at all concentrations of phosphate, while at very high oxygen tensions the opposite effect was observed. When the ethanol yield was high, the respiratory quotient was also high. These results are discussed in relation to the oxidative phosphate-lack theory of the Pasteur effect.

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Arbuscular mycorrhizal responsiveness of in vitro tomato root lines is not related to growth and nutrient uptake rates

Canadian Journal of Botany ◽

10.1139/b03-057 ◽

2003 ◽

Vol 81 (7) ◽

pp. 645-656 ◽

Cited By ~ 9

Author(s):

Karine Labour ◽

Mario Jolicoeur ◽

Marc St-Arnaud

Keyword(s):

Nutrient Uptake ◽

Hairy Root ◽

Hairy Roots ◽

Inorganic Phosphate ◽

Minimal Medium ◽

Glomus Intraradices ◽

Phosphate Concentration ◽

Tomato Cultivar ◽

Uptake Rates

Variability in growth and nutritional dynamics of in vitro tomato hairy root lines and their relationship with responsiveness to mycorrhizal colonization were studied. Four tomato cultivars were transformed with three Agrobacterium rhizogenes strains to obtain several hairy root lines, which were compared for growth and receptivity to Glomus intraradices. Four transformed hairy root lines were further characterized and compared with excised roots of the nontransformed tomato cultivar 'Cobra' and with Ri-T-DNA carrot hairy roots. Lines were compared during 4 months on minimal medium in terms of growth, nutrient uptake, and mycorrhizal colonization. In a subexperiment, the cultures were grown on a modified minimal medium to assess the contribution of initial inorganic phosphate concentration in mycorrhizal susceptibility of the three initially nonreceptive lines. On minimal medium, growth and nutrient uptake rates were highly correlated, but both were unrelated to mycorrhizal receptiveness. All the lines successfully established the symbiosis when the initial phosphate concentration was significantly reduced. No association was found between the origin of lines from the different tomato cultivar bacterial strain combinations and the absence of symbiosis establishment on minimal medium. Decrease of inorganic phosphate concentration at the beginning of the culture was a key factor involved in precolonization steps of mycorrhizal symbiosis.Key words: Glomus intraradices, hairy roots, Lycopersicon esculentum, mycorrhizal responsiveness, root nutrition, inorganic phosphate.

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Absorption of Inorganic Phosphate in the Human Small Intestine

Clinical Science ◽

10.1042/cs0560407 ◽

1979 ◽

Vol 56 (5) ◽

pp. 407-412 ◽

Cited By ~ 47

Author(s):

J. Walton ◽

T. K. Gray

Keyword(s):

Small Intestine ◽

Inorganic Phosphate ◽

Water Movement ◽

Human Subjects ◽

Sodium Concentration ◽

Phosphate Concentration ◽

Phosphate Absorption ◽

Human Small Intestine ◽

Intestinal Phosphate Absorption

1. Intestinal phosphate absorption in human subjects was studied by the technique of triple lumen intestinal perfusion in vivo. 2. Ileal phosphate absorption increased as the intraluminal phosphate concentration was increased. 3. Ileal rates of phosphate absorption were lower at any given intraluminal phosphate concentration than previously described jejunal rates. Acidification of the ileal lumen did not increase phosphate absorption. 4. Phosphate absorption was shown in the jejunum to be dependent on the intraluminal sodium concentration. 5. Phosphate absorption in the human small intestine consists of at least two components, one directly proportional to water movement and the second apparently independent of water movement.

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Dissolved Inorganic Phosphate Concentration in Stream Water in Japan and Factors Controlling the Concentration

Journal of Japan Society on Water Environment ◽

10.2965/jswe.29.679 ◽

2006 ◽

Vol 29 (11) ◽

pp. 679-686 ◽

Cited By ~ 7

Author(s):

Takashi WAKAMATSU ◽

Eiichi KONOHIRA ◽

Junko SHINDO ◽

Takahito YOSHIOKA ◽

Katsuo OKAMOTO ◽

...

Keyword(s):

Inorganic Phosphate ◽

Stream Water ◽

Phosphate Concentration

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Sebaran Horizontal Konsentrasi Nitrat Dan Fosfat Anorganik Di Perairan Muara Sungai Kendal Kabupaten Kendal

Journal of Tropical Marine Science ◽

10.33019/jour.trop.mar.sci.v1i1.654 ◽

2018 ◽

Vol 1 (1) ◽

pp. 27-32

Author(s):

Dwi Nur Hanifah ◽

Sri Yulina Wulandari ◽

Lilik Maslukah ◽

Endang Supriyantini

Keyword(s):

Distribution Pattern ◽

Inorganic Phosphate ◽

Sampling Method ◽

Phosphate Concentration ◽

Primary Data ◽

Current Pattern ◽

Purposive Sampling ◽

Transition Area ◽

Nitrate Concentrations ◽

Near Shore

Muara sungai Kendal banyak dimanfaatkan untuk berbagai aktivitas masyarakat seperti pemukiman penduduk, industri, pertambakan dan Tempat Pelelangan Ikan. Aktivitas masyarat di sekitar sungai Kendal akan mempengaruhi kondisi perairan di muara sungai Kendal. Penelitian ini dilaksanakan pada bulan November 2017. Tujuan penelitian ini adalah untuk mengetahui sebaran konsentrasi nitrat dan fosfat anorganik secara horizontal di permukaan perairan muara sungai Kendal. Pengambilan sampel dilakukan pada 12 stasiun menggunakan metode purposive sampling dengan pertimbangan dapat mewakili wilayah muara sungai, dekat pantai, wilayah transisi dan laut. Data utama meliputi konsentrasi nitrat dan fosfat. Data pendukung meliputi suhu, salinitas, DO, pH dan kecerahan yang diukur secara langsung di lapangan, serta data yang diperoleh dari berbagai instansi terkait. Hasil penelitian menunjukkan bahwa konsentrasi nitrat dan fosfat semakin menurun menuju laut. Konsentrasi nitrat berkisar 2,1172 – 3,2459 µmol/l dan konsentrasi fosfat berkisar 0,1699 – 1,0437 µmol/l. Pola sebaran konsentrasi nitrat dan fosfat tidak mengikuti pola arus. The estuary of Kendal is widely used for various activities such as residential, industrial, fishpond and fish auction places. Activity around the Kendal river will affect the conditions at the estuary of Kendal. This research was conducted in November 2017. The purpose of this research was to know the distribution of nitrate and inorganic phosphate concentration horizontally at surface of estuary Kendal. Sampling was conducted on 12 stations used purposive sampling method with consideration to represent the estuary, near shore, transition area and the sea. The Primary data included nitrate and phosphate concentrations. Supporting data included temperature, salinity, DO, pH and brightness measured directly in the field, as well as data obtained from various related agencies. The results showed that the concentration of nitrate and phosphate decreased toward the sea. Nitrate concentrations ranged from 2.1172 – 3.2459 µmol/l and phosphate concentrations ranged from 0.1699 – 1.0437 µmol/l. The distribution pattern of nitrate and phospate concentration did not follow the current pattern.

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