Oxygen-absorption rate-controlled feeding of substrate into aerobic microbial cultures

1966 ◽  
Vol 8 (1) ◽  
pp. 117-134 ◽  
Author(s):  
Jaroslav Hospodka
Keyword(s):  
Absorption Rate ◽  
Oxygen Absorption ◽  
Microbial Cultures ◽  
Oxygen Absorption Rate ◽  
Rate Controlled

scholarly journals Assessment of the efficiency of oxygen absorption in rotor-pulsating apparatus

2018 ◽  
pp. 117-124 ◽  
Author(s):  
Oleksandr Obodovych ◽  
Vitalii Sydorenko
Keyword(s):  
Experimental Data ◽  
Energy Efficiency ◽  
Rotational Speed ◽  
Absorption Rate ◽  
Sodium Sulfide ◽  
Chemical Oxidation ◽  
Model Solution ◽  
Oxygen Absorption ◽  
Oxygen Absorption Rate ◽  
Aeration Conditions

This work presents the results of a study of the oxygen absorption rate in water solutions in the setup consisting of a jet unit and disperser-mixer, which is a rotor-pulsating apparatus. The purpose of the work was to evaluate the efficiency of the rotor-pulsating apparatus in the aeration of aqueous solutions. The experimental data were obtained by the method of chemical oxidation of sodium sulfide, part of the model solution, with air oxygen,. The influence of the rotor rotational speed on the oxygen absorption rate was determined by experiments. A comparison of aeration conditions, sulfite number, and energy efficiency in relation to the corresponding characteristics of some pneumatic and mechanical aerators found in the literature is provided.

Stress Relaxation in Rubber II. Simultaneous Oxygen Absorption

1956 ◽  
Vol 29 (1) ◽  
pp. 250-262
Author(s):  
S. Baxteh ◽  
P. D. Potts ◽  
H. A. Vodden
Keyword(s):  
Stress Relaxation ◽  
Absorption Rate ◽  
Oxidative Degradation ◽  
Oxygen Absorption ◽  
Network System ◽  
Antioxidant Action ◽  
Basic Study ◽  
Aging Studies ◽  
Oxygen Absorption Rate ◽  
A New Technique

Abstract In any serious study of antioxidant action, it is essential that the oxygen absorption rate of a protected rubber be determined and the changes in the network system caused by the oxygen be assessed. This information is normally obtained from separate oxygen absorption and aging studies. A method is described in this article which enables simultaneous measurements of oxygen absorption and stress relaxation to be made on a given rubber sample. A number of antioxidants have been compounded with natural rubber and, from the results, an estimate is made of the molecules of oxygen absorbed per rubber chain cut. This is found to vary with the antioxidant, although some difficulties of interpretation are pointed out. Variations of deactivating effect among the antioxidants shows clearly that any attempt to understand oxidative degradation in terms of oxygen absorption or decay in physical properties alone is not possible. The method provides a new technique that is of value in any basic study of antioxidant action in elastomers.

scholarly journals Production of a-amylase in acid cheese whey culture media with automatic pH control

1998 ◽  
Vol 29 (4) ◽  
pp. 259-264 ◽  
Author(s):  
Rosana Ferreyra ◽  
Graciela Lorda ◽  
Antonio Balatti
Keyword(s):  
Enzyme Production ◽  
Cheese Whey ◽  
Culture Media ◽  
Oxygen Demand ◽  
Ph Control ◽  
Oxygen Absorption ◽  
Cell Aggregates ◽  
Lead Electrode ◽  
Oxygen Absorption Rate ◽  
Industrial Use

The influence of aeration and automatic pH control on the production of <FONT FACE="Symbol">a</FONT>-amylase by a strain of Bacillus subtilis NRRL 3411 from acid cheese whey was studied. Tests were carried out in a rotary shaker and in mechanically stirred fermenters. <FONT FACE="Symbol">a</FONT>-amylase was analysed according to DUN’s method. Oxygen absorption rate was determined by Cooper’s method. Cell oxygen demand was determined as oxygen consumption in a Warburg respirometer. The level of dissolved oxygen was measured by means of a galvanic silver-lead electrode. Results suggest the possibility of industrial use of acid cheese whey as a carbon source for <FONT FACE="Symbol">a</FONT>-amylase production, since the yield was similar to that produced with lactose. The highest <FONT FACE="Symbol">a</FONT>-amylase levels 10,000 DUN/ml units were not attained at higher aeration rates -431 mLO2/L.h-. The indicated value correspond to a 96 h process with automatic pH control at 7.5. These conditions resulted in double concentration of <FONT FACE="Symbol">a</FONT>-amylase. The enzyme production was directly related to growth in the form of cell aggregates.

Preparation and Characterization of Pt Coated on Al-Doped ZnO Nanorods Thin Film at Different Thicknesses

2015 ◽  
Vol 1109 ◽  
pp. 271-275
Author(s):  
M.N. Wahida ◽  
M.H. Mamat ◽  
A.A.M. Yusoff ◽  
Mohamad Rusop
Keyword(s):  
Thin Film ◽  
Absorption Rate ◽  
Zno Nanorods ◽  
Oxygen Absorption ◽  
Uv Absorbance ◽  
Voltage Measurement ◽  
Current Voltage ◽  
Doped Zno ◽  
20 Nm

The surfaces of Al-doped ZnO nanorods thin films were coated with platinum (Pt) by five different thicknesses; 5 nm, 10 nm, 15 nm, 20 nm and 25 nm. The resistivity decreases while the conductivity increases, proving the trend in current-voltage measurement. The transmittance spectra show diverse result. Meanwhile the 5 nm coating sample shows highest absorbance characteristic among others. This absorption coefficient was calculated from transmittance obtained by UV-vis spectra, indicating that they have high UV absorbance properties at wavelengths below 400 nm. Absorption rate might be due to the thickness of Pt that allows the penetration of UV for more oxygen absorption.

Extravascular Administration of Factor IX: Potential for Replacement Therapy of Canine and Human Hemophilia B

1997 ◽  
Vol 77 (05) ◽  
pp. 0944-0948 ◽  
Author(s):  
Darla Liles ◽  
Charles N Landen ◽  
Dougald M Monroe ◽  
Celeste M Lindley ◽  
Marjorie s Read ◽  
...  
Keyword(s):  
Gene Therapy ◽  
Vitamin K ◽  
Absorption Rate ◽  
Venous Access ◽  
Factor Ix ◽  
Hemophilia B ◽  
Current Therapy ◽  
Home Therapy ◽  
Routes Of Administration ◽  
Plasma Compartment

SummaryCurrent therapy for hemophilia B requires large intravenous doses of factor IX (F.IX) given in the clinic or at home. Although home therapy is possible for many patients, it is often complicated by factors such as the lack of good venous access. Very little is known about extravascular routes for administering proteins like F.IX (57 kD) or other vitamin K-dependent procoagulant factors into the circulation. Questions about the absorption rate from extravascular administration as well as plasma recovery and bioavailability have arisen recently with the growing availibility of highly purified procoagulant proteins and increased interest in gene therapy of hemophilia B. Therefore, a group of studies were undertaken to determine the absorption rate, plasma recovery, and bioavailability of high purity, human plasma-derived F.IX concentrates administered via extravascular routes in hemophilia B dogs and in one human hemophilia B subject. Five hemophilia B dogs were given human F.IX via either a subcutaneous (SC), intramuscular (IM), intra- peritoneal (IP) or intravenous (IV) route. In a subsequent study, a single SC administration of human F.IX was compared to an identical IV dose of F.IX in the human hemophilia B subject. All extravascular routes of F.IX administration in both the canine and human gave lower levels of circulating plasma F.IX than the IV route, however all routes resulted in measurable F.IX activity. Of the extravascular routes, the IM injection in the canine resulted in a bioavailibility of 82.8%, while the SC injection resulted in a bioavailability of 63.5%. F.IX reached the plasma compartment by all extravascular routes used, confirming that F.IX can be absorbed extravascularly. The duration of measurable F.IX activity following extravascular administration is prolonged beyond that typically seen with IV administration. These data show that significant levels of F.IX may be obtained via SC injection in canine and ‘ human hemophilia B subjects and further highlight the potential of extravascular routes of administration for future experimental and clinical uses of F.IX and other procoagulant proteins.

Alcohol Absorption Rate from Different Parts of the Gut

1968 ◽  
Vol 29 (2) ◽  
pp. 308-312
Author(s):  
Ronald G. Elmslie ◽  
Nanette Harvey
Keyword(s):  
Absorption Rate ◽  
Different Parts

Variability of Specific Absorption Rate of Human Body for Various Configurations of Tablet Computer in Vicinity of Abdomen

2015 ◽  
Vol E98.B (7) ◽  
pp. 1173-1181 ◽  
Author(s):  
Akihiro TATENO ◽  
Tomoaki NAGAOKA ◽  
Kazuyuki SAITO ◽  
Soichi WATANABE ◽  
Masaharu TAKAHASHI ◽  
...  
Keyword(s):  
Human Body ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Tablet Computer ◽  
Specific Absorption
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