The effect of phosphate deficiency on the kinetics of phosphate absorption by sterile excised barley roots, and some factors affecting the ion uptake efficiency of roots

1972 ◽  
Vol 3 (4) ◽  
pp. 313-322 ◽  
Author(s):  
B. Cartwright
Keyword(s):  
Ion Uptake ◽  
Phosphate Deficiency ◽  
Factors Affecting ◽  
Phosphate Absorption ◽  
Uptake Efficiency ◽  
Kinetics Of

Factors Affecting the Kinetics of Urea Hydrolysis via Sporoscarcina pasteurii

2019 ◽  
Author(s):  
Shahin Safavizadeh ◽  
Brina M. Montoya ◽  
Mohammed A. Gabr ◽  
Detlef R. U. Knappe
Keyword(s):  
Urea Hydrolysis ◽  
Factors Affecting ◽  
Kinetics Of

Review lecture: Ectomycorrhizas as nutrient absorbing organs

1978 ◽  
Vol 203 (1150) ◽  
pp. 1-21 ◽  
Keyword(s):  
Oxygen Uptake ◽  
Nutrient Uptake ◽  
Metabolic Control ◽  
Nutrient Absorption ◽  
Factors Affecting ◽  
Phosphate Absorption ◽  
Linear Relations

Early work on ectomycorrhizas indicated that they were probably adapted to efficient nutrient absorption. The use of excised mycorrhizas has allowed study of their properties as absorbing organs. The factors affecting their rates of nutrient uptake are similar to those of other absorbing organs but their rates are often greater. On absorption the nutrient is primarily accumulated in the fungal layer but may be mobilized later by reactions under metabolic control. Phosphate is accumulated in particularly large quantities as polyphosphate, which probably explains the linear relations of phosphate absorption and oxygen uptake in certain conditions. Hyphal connections between the fungal sheath and the substrate are variable, and this poses problems about absorption of ions of low mobility, and about the function of surface phosphatases. The fungal sheath is dependent on the host for carbohydrate and the drain on it may be considerable.

Effect of Laser Surface Modification on the Crystallinity of Poly(L-Lactic Acid)

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Anubha Bhatla ◽  
Y. Lawrence Yao
Keyword(s):  
Lactic Acid ◽  
Polymer Surface ◽  
X Ray Diffraction ◽  
Factors Affecting ◽  
Laser Surface Modification ◽  
Third Harmonic ◽  
X Ray ◽  
Annealing Conditions ◽  
Kinetics Of

Crystallinity of semicrystalline polymers such as aliphatic homopolymer poly(L-lactic acid) (PLLA) affects their degradation and physical properties. In this paper, the effects of laser irradiation using the third harmonic of a Nd:YAG laser on the crystallinity, long-range order, and short-range conformations at the surface of PLLA films are investigated. The factors affecting the transformation are also studied. Detailed characterization of the effect of laser treatment is accomplished using microscopy, X-ray diffraction, and infrared spectroscopy. The cooling rates in the process and the spatial and temporal temperature profiles are numerically examined. The simulation results in conjunction with melting and crystallization kinetics of PLLA are used to understand the effect on sample crystallinity. The effects of laser fluence and annealing conditions on the crystallinity of the processed films are examined. Since degradation profiles depend on crystallinity, laser processing can potentially be used to achieve a modified spatially controlled polymer surface with promising applications such as controlled drug delivery.

The factors affecting the growth kinetics of Sulfolobus solfataricus, a sulfur removing bacterium

1993 ◽  
Vol 33 (1) ◽  
pp. 61-75 ◽  
Author(s):  
Tijen Özbaş ◽  
Tülay Durusoy ◽  
Abdurrahman Tanyolaç ◽  
Yuda Yürüm
Keyword(s):  
Growth Kinetics ◽  
Sulfolobus Solfataricus ◽  
Factors Affecting ◽  
Kinetics Of
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