Enzyme Activity Patterns in Clear Human Lenses and in Different Types of Human Senile Cataract

2008 ◽  
pp. 117-133 ◽  
Author(s):  
D. Friedburg
Keyword(s):  
Enzyme Activity ◽  
Activity Patterns ◽  
Senile Cataract ◽  
Different Types ◽  
Human Lenses

Enzyme Immobilization on Nanomaterials for Biosensor and Biocatalyst in Food and Biomedical Industry

2019 ◽  
Vol 25 (24) ◽  
pp. 2661-2676 ◽  
Author(s):  
Sundaresan Bhavaniramya ◽  
Ramar Vanajothi ◽  
Selvaraju Vishnupriya ◽  
Kumpati Premkumar ◽  
Mohammad S. Al-Aboody ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Enzyme Immobilization ◽  
Food Industry ◽  
Environmental Changes ◽  
Immobilized Enzymes ◽  
Food Industries ◽  
Physiological Processes ◽  
Different Types ◽  
Simple Processing ◽  
Biomedical Industry

Enzymes exhibit a great catalytic activity for several physiological processes. Utilization of immobilized enzymes has a great potential in several food industries due to their excellent functional properties, simple processing and cost effectiveness during the past decades. Though they have several applications, they still exhibit some challenges. To overcome the challenges, nanoparticles with their unique physicochemical properties act as very attractive carriers for enzyme immobilization. The enzyme immobilization method is not only widely used in the food industry but is also a component methodology in the pharmaceutical industry. Compared to the free enzymes, immobilized forms are more robust and resistant to environmental changes. In this method, the mobility of enzymes is artificially restricted to changing their structure and properties. Due to their sensitive nature, the classical immobilization methods are still limited as a result of the reduction of enzyme activity. In order to improve the enzyme activity and their properties, nanomaterials are used as a carrier for enzyme immobilization. Recently, much attention has been directed towards the research on the potentiality of the immobilized enzymes in the food industry. Hence, the present review emphasizes the different types of immobilization methods that is presently used in the food industry and other applications. Various types of nanomaterials such as nanofibers, nanoflowers and magnetic nanoparticles are significantly used as a support material in the immobilization methods. However, several numbers of immobilized enzymes are used in the food industries to improve the processing methods which not only reduce the production cost but also the effluents from the industry.

scholarly journals EFFECT OF WATER ON PROTEIN, PROTEIN COMPOSITION AND RELATED ENZYME ACTIVITY IN DIFFERENT TYPES OF MAIZE

2007 ◽  
Vol 31 (4) ◽  
pp. 720-728 ◽  
Author(s):  
ZHANG Zhi-Meng ◽  
◽  
DAI Liang-Xiang ◽  
HU Chang-Hao ◽  
DONG Shu-Ting ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Protein Composition ◽  
Effect Of Water ◽  
Different Types ◽  
Related Enzyme

CYCLISCHE SCHWANKUNGEN DER AKTIVITÄTEN VON HYDROXYSTEROID-DEHYDROGENASEN IM CORPUS LUTEUM DES RINDES

1972 ◽  
Vol 69 (2) ◽  
pp. 369-384
Author(s):  
H. Brandau ◽  
L. Brandau ◽  
G. Mutzke
Keyword(s):  
Enzyme Activity ◽  
Corpus Luteum ◽  
Enzyme Activities ◽  
Optical Method ◽  
Activity Patterns ◽  
Hydroxysteroid Dehydrogenase ◽  
Corpora Lutea ◽  
Bovine Corpus Luteum ◽  
Glucose 6 Phosphate Dehydrogenase

ABSTRACT In the bovine corpora lutea periodical activities of the Δ53β-, 3β-, 17β-and 20β-hydroxysteroid dehydrogenase (OHSDH) as well as activities of glyceraldehyde-3-phosphate- and glucose-6-phosphate dehydrogenase were measured quantitatively and the alterations throughout the different stages of the cycle were studied. After homogenization of the tissue and fractionate centrifugation the enzyme activities were determined by a standardized optical method. The activities of the Δ53β-, and 3β- and 17β-OHSDH increase slowly during the first 7 days of the cycle, the maximum is reached abruptly on the 12th to 13th day of the cycle. After a striking reduction the activities decline continually to the 19th to 21st day reaching the values detected at the beginning of the cycle. The 20β-OHSDH increases slowly to the maximum on the 15th day of the cycle. Activities of the 3α-OHSDH were obtained only inconsistently. The behaviour of the activities of G6PDH was nearly identical with that of the 3β-OHSDH, while the GAPDH shows only little fluctuations of its activities. The obtained enzyme activity patterns of the maturating and high functional corpus luteum correspond to the well-known data of the biosynthetic function of the bovine corpus luteum. The changes of the amounts of progesterone and 20β-progesterol agree with the course of the activities of the 3β- resp. 20β-OHSDH.

Enzyme activity patterns of energy metabolism in skiers of different performance levels (M. quadriceps femoris)

1982 ◽  
Vol 48 (3) ◽  
pp. 315-322 ◽  
Author(s):  
Eva V. Macková ◽  
Arnošt Bass ◽  
štĚpánka šprynarová ◽  
Jan Teisinger ◽  
Karel Vondra ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Energy Metabolism ◽  
Activity Patterns ◽  
Quadriceps Femoris ◽  
Performance Levels

Enzyme activity patterns of energy supplying metabolism in the quadriceps femoris muscle(Vastus lateralis)

1976 ◽  
Vol 361 (2) ◽  
pp. 169-173 ◽  
Author(s):  
Arnošt Bass ◽  
Karel Vondra ◽  
Ratmír Rath ◽  
Václav Vítek ◽  
Jan Teisinger ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Vastus Lateralis ◽  
Activity Patterns ◽  
Quadriceps Femoris ◽  
Quadriceps Femoris Muscle ◽  
Femoris Muscle

Latitude Dependent Circadian Rhythms of Carabid Beetles

1986 ◽  
Vol 41 (9-10) ◽  
pp. 935-945
Author(s):  
Gisela Leyk ◽  
Wolfgang Martin
Keyword(s):  
Time Course ◽  
Activity Patterns ◽  
Carabid Beetles ◽  
Constant Darkness ◽  
Spectrum Estimation ◽  
Program System ◽  
Central European ◽  
Light Pulses ◽  
Different Types ◽  
Periodogram Analysis

Abstract Comparative studies of circadian activity rhythms were performed with three stocks of the species Pterostichus rhaeticus Heer (from Southern Europe, Central Europe, and the Subarctic) and with one Central European stock of the sibling species Pterostichus nigrita Paykull. The hehaviour was investigated in various LD conditions, constant conditions including LL with changes of the illumination intensity and constant darkness with light pulses. The data were analysed with the program system “Timesdia” containing various techniques like power spectrum estimation, periodogram analysis and complex demodulation. This allowed to reveal the time course of rhythms and to determine the number of phase jumps as a measure for precision. With the help of these methods, the activity patterns are classified in different types of behaviour: synchronization, temporarily synchronization, aperiodic behaviour, free run, temporarily free run, relative entrainment, and relative coordination. Besides graduated differences between the populations in south-to-north direction (e.g. in the tendency to rhythmic behaviour) the analysis revealed splitting of rhythms into two or even three components of different frequencies and transitions from rhythmic to aperiodic behaviour or vice versa after arbitrarily chosen light pulses in constant darkness. This behaviour cannot be explained by a system which is composed of one single limit cycle oscillator, but the results rather support a multi-oscillator model.

Sign in / Sign up

Export Citation Format

Share Document