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  • Blackwell Publishing Ltd  (8)
  • American Society of Hematology  (4)
  • Copernicus
  • 1975-1979  (12)
  • 1955-1959
  • 1979  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of temperature and current discharge on the concentration and photosynthetic activity of the phytoplankton in the upper Mississippi River (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 9 (1979), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Temperature and current discharge regulated phytoplanktonic concentration, chlorophyll-a concentration, the light-saturated rate of photosynthesis (Pmax), and photosynthetic capacity (Pcap) in the Mississippi River at Prairie Island, Minnesota. The chlorophyll-a maximum was 48 mg m−3 in 1975, a wet year with a high current discharge, and 190 mg m−3 in 1976, a relatively dry year. The highest values of Pmax were 0.37 (mgO2 I−1h−1) in 1975 and 1.60 in 1976. Pcap varied from 3 to 21 (gO2 per g chlorophyll-a h−1) both years, and its value was highly correlated with temperature. The temperature optimum shifted from 16°C for Pcap in the spring, to greater than 28°C in the summer. Multiple regression analysis indicated a second-order relationship of Pcap in the spring to temperature. Other independent variables explained only negligible variation of Pcap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01502.x
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  • 2
    Electronic Resource
    Electronic Resource
    Concentrate supplementation, and the herbage intake and milk production of heifers grazing Cenchrus ciliaris (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 34 (1979), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Friesian heifers grazing Cenchrus ciliaris cv. Biloela were supplemented with 0, 3 or 6 kg concentrates daily during weeks 10–34 (±1·7) of lactation during either the rainy or the dry season. The overall responses to concentrate were identical between seasons at 0·27 kg extra milk and solids corrected milk per kg. Supplementation increased total feed intake and modified the grazing behaviour of cows. For each kg concentrate organic matter eaten, herbage organic matter intake was reduced by 0·64 and 0·42 kg in the rainy and dry seasons respectively and the time spent grazing by 11 min. Higher intakes in the dry season were the result of an increased rate of biting and were reflected in liveweight change but not milk yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1979.tb01482.x
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  • 3
    Electronic Resource
    Electronic Resource
    Herbage intake and milk production by grazing dairy cows 2. The effects of level of winter feeding and daily herbage allowance (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 34 (1979), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Two experiments are described in which two levels of winter feeding and three levels of herbage allowance during the grazing season were imposed upon March/April calving British Friesian dairy cows. The winter treatments resulted in differences in live weight and milk yield at turnout of 35 and 53 kg and 3·4 and 3·2 kg d-1 for the two trials. Subsequently, when grazed at generous herbage allowances, the cows were able to compensate for much of this difference but when herbage was restricted the milk yield differences were accentuated.Groups of cows from each winter treatment were offered 25, 50 or 75 (Experiment 1) and 30, 50 or 70 (Experiment 2) g herbage DM per kg LW daily during the grazing season. Daily herbage intakes on the three allowances in each trial were 14·1, 13·3, 10·7 and 12·5, 12·1, 11·5 kg OM and milk yields were 16·0, 15·3, 12·5 and 15·2, 14·3, 11·8 kg SCM respectively. Both intake and milk production were depressed once the cows were forced to consume more than 50% of herbage on offer or to graze the sward down to a mean height of less than 8–10 cm. Grazing behaviour observations indicated that under rotational managements the cows did not compensate for restrictions in available herbage by grazing longer. Highest levels of milk production per unit area were observed in both trials when production per cow was depressed by 20–25%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1979.tb01477.x
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  • 4
    Electronic Resource
    Electronic Resource
    Soil Water Stress and Photosynthesis in Cotton (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 47 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: An experiment was conducted in SPAR systems at Florence, S.C., to obtain a data set for use in the simulation of the effect of drying soil on photosynthetic rates in cotton. The plant water status was monitored using leaf water potential and stem diameter meaurements. Reductions were noted in apparent photosynthesis rates after only 5 days of soil drying, and as anticipated, there was uniform displacement of the diurnal cycle of leaf water potential, and corresponding decreases in transpiration and CO2 uptake. The photosynthesis-light response curves indicated that an average two-fold reduction in photosynthesis rates occurred for solar radiation greater than 250 W/m2. Stem diameter change (from a nonstress pre-sunrise value) and integrated stem stress were found to be good indicators of maximum daily plant water stress. The integrated stem stress gave a measure of the duration of the stress along with its magnitude. A simulation method for predicting leaf water potential from stem diameter measurements was used to show that the magnitude and duration of plant water stress increased uniformly during the experiment. This increase was representative of the decreased rates of photosynthesis measured. These data will be used in the simulation of cotton growth and yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb06305.x
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  • 5
    Electronic Resource
    Electronic Resource
    BACTERIAL REPRESSIVE ACTION OF MEAT STARTER CULTURE IN PASTEURIZED LIQUID WHOLE EGG (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pediococcus cerevisiae inoculated in pasteurized liquid whole egg (PLWE) (3°C, pH 7.4) had a larger repressive action than Lactobacillus plantarum toward Pseudomonas fluorescens (2.8 and 1.6 log cycles respectively) but both had the same repressive action against1 Pseudomonas fragi and Pseudomonas putrefaciens. The 50:50 mixture of the starter cultures had a repressive action similar to the, pediococci against P. fluorescens but was more effective against P. putrefuciens than against P fragi (2.5 and 1.6 log cycles respectively). At pH 6.8 both starter cultures and their mixture had a, larger repressive action toward the three species of Pseudomonas. Salmonella typhimurium at 11°C, pH 7.4 was not repressed by the starter cultures. At pH 6.8 the repressive action of only the pediococci and the mixture increased (1.0–2.0 log cycles). A further decrease of the pH of the PLWE to 6.2 did not change the repressive action of the starter cultures against the pathogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb10013.x
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  • 6
    Electronic Resource
    Electronic Resource
    POTENTIAL APPLICATION OF MICROBIAL ANTAGONISM TO EXTENDED STORAGE STABILITY OF A FLESH TYPE FOOD (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The shelf life of both refrigerated ground and mechanically deboned poultry meat was extended by 2 days using the resting cells of the starter cultures Pediococcus cerevisiae (Accel) and Lactobacillus plantarum (Lactacel DS). The microbial population of the treated sample was 10% of that of the control at the onset of “off-odor” in the control. The lactic acid bacteria (LAB) did not decrease the pH of the meat. Fluorescent psychrotrophic colonies were not detected in the treated samples, but were present in the control. P. cerevisiae in Buffered Brain Heart Infusion Broth (BBHI) inhibited Pseudomonas fluorescens and Pseudomonas putrefaciens more than Pseudomonas fragi. L. plantarum in BBHI inhibited the growth of P. fluorescens and P. fragi and caused P putrefaciens to lose its ability to form colonies on Tryptic Soy Agar. The meat starter cultures in BBHI totally inhibited the growth of Salmonella typhimurium and Staphylococcus aureus at 15°C. Using the “spot on the lawn” technique both LAB produced an antagonistic agent only against S. aureus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb09999.x
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  • 7
    Electronic Resource
    Electronic Resource
    T-CELL GROWTH FACTOR-MEDIATED T-CELL PROLIFERATION (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 332 (1979), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1979.tb47136.x
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  • 8
    Electronic Resource
    Electronic Resource
    Estimation of the growth rates of epiphytic bacteria and Lemna minor in a river (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 9 (1979), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Growth of Lemna minor fronds in the River Frome during summer was found to be logarithmic with time and the growth rate (log10) was 0.066 day−1. This is equivalent to a doubling time of 4.5 days. The life expectancy of the fronds was 34 days.The net change in the density of bacteria epiphytic on the lower surface of Lemna fronds in the R. Frome was monitored using a direct microscopic technique. The observed increase in bacterial numbers has been partitioned into the components of attachment and growth, assuming that attachment occurred at a constant rate and that the bacterial population grew logarithmically. The line which fitted the data best gave an attachment rate of 5.7 × 105 bacteria cm−2 day−1 and a growth rate (log10) for the bacteria of 0.044 day−1 which is equivalent to a doubling time of 164 h.Estimates of the rate of detachment of bacteria from Lemna plants were obtained from a laboratory experiment which assumed negligible growth of bacteria in 1 h. The number of bacteria which detached per hour and the sizes of the bacterial populations on the plants before and after detachment were estimated using a plating technique. Different detachment rates were monitored. The detachment rate (analogous to growth rate) which is judged to be most similar to an in situ value was 0.0031 h−1 (0.074 day−1). This rate added to the specific growth rate given above resulted in a corrected growth rate of 0.118 day−1 equivalent to a doubling time of 61 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01516.x
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  • 9
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    Quantitation of human thymus/leukemia-associated antigen by radioimmunoassay in different forms of leukemia (1979)
    American Society of Hematology
    Details
    Publication Date: 1979-12-01
    Description: Using a radioimmunoassay, increased levels of a human thymus/leukemia- associated antigen (HThy-L) have been detected in leukemic cells and plasma from most patients with E-rosette-positive acute lymphoblastic leukemia (ALL) and a number of patients with E-rosette-negative ALL, acute myeloblastic leukemia (AML), acute monomyelocytic leukemia (AMML), and acute undifferentiated leukemia (AVL). Low levels of HThy-L have been demonstrated in white cells from patients with chronic myelocytic leukemia (stable phase) and in mononuclear cells from patients with chronic lymphatic leukemia. The relationship between HThy- L and differentiation of hematopoietic cells is discussed.
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
    Published by American Society of Hematology
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  • 10
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    Mechanism of action of serum factors that regulate granulopoiesis in vitro: possible physiologic role of serum-inhibiting activity (1979)
    American Society of Hematology
    Details
    Publication Date: 1979-02-01
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
    Published by American Society of Hematology
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