scholarly journals A comparative study of turacin and hæmatin and its bearing on cytochrome

1926 ◽  
Vol 100 (701) ◽  
pp. 129-151 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Comparative Study ◽  
Colloidal Suspension ◽  
Spectroscopic Properties ◽  
Chemical State ◽  
Nitrogen Compounds ◽  
Physico Chemical ◽  
The Relationship

This study originated from the investigation on cytochrome, which is a widely distributed, intracellular, respiratory pigment. It was found in the course of this investigation that many problems concerning this pigment would be more easily approached, or even solved, when we have succeeded in elucidating certain obscure points concerning some of the better-known and simpler compounds such as turacin and hæmatin. It was found, for instance, of paramount importance to obtain a better understanding of the relationship between the physico-chemical state of the pigment and its absorption spectrum. It will be shown here that the definite change in the absorption spectrum of a substance, which passes from a state of a solution into that of a colloidal suspension, explains a number of phenomena which have been previously observed but not understood. The combination between the reduced or oxidised hæmatin and various nitrogen compounds, in other words the relationship between such compounds as hæmatin, hæm, hæmochromogen and kathæmoglobin will also be considered. This will be shown to have an important bearing on the study of cytochrome. The methods used in this investigation do not differ much from those already described in my study on cytochrome (1925, pp. 313-314). Two instruments have been used for this study: the microspectroscopic ocular of Zeiss and the Hartridge reversion spectroscope, the latter having been used both in the ordinary way and as a microspectroscope. The sources of light have varied according to requirement, and were either ordinary filament electric bulbs (50 candle-power), pointolite lamp, Nernst lamp or a small arc. The latter was very useful in the spectroscopic examinations of turbid fluids and precipitates. We can hardly overestimate the importance of the last-named method, for a number of essential spectroscopic properties of the pigments can be revealed only by the study of their solutions during the process of precipitation.

Identifying Physico-Chemical Laws from the Robotically Collected Data

2019 ◽  
Author(s):  
Liwei Cao ◽  
Danilo Russo ◽  
Vassilios S. Vassiliadis ◽  
Alexei Lapkin
Keyword(s):  
Experimental Data ◽  
Numerical Models ◽  
Predictor Variable ◽  
Physical Models ◽  
Training Data ◽  
Mixed Integer ◽  
Physico Chemical ◽  
Data Points ◽  
Future Work ◽  
The Relationship

<p>A mixed-integer nonlinear programming (MINLP) formulation for symbolic regression was proposed to identify physical models from noisy experimental data. The formulation was tested using numerical models and was found to be more efficient than the previous literature example with respect to the number of predictor variables and training data points. The globally optimal search was extended to identify physical models and to cope with noise in the experimental data predictor variable. The methodology was coupled with the collection of experimental data in an automated fashion, and was proven to be successful in identifying the correct physical models describing the relationship between the shear stress and shear rate for both Newtonian and non-Newtonian fluids, and simple kinetic laws of reactions. Future work will focus on addressing the limitations of the formulation presented in this work, by extending it to be able to address larger complex physical models.</p><p><br></p>

Introduction

2018 ◽  
Author(s):  
Marko Geslani
Keyword(s):  
Comparative Study ◽  
Royal Power ◽  
History Of ◽  
Historical Developments ◽  
The Comparative Study ◽  
The Relationship ◽  
Over Time ◽  
Indian Religion

The introduction reviews the historiographic problem of the relation between fire sacrifice (yajña) and image worship (pūjā), which have traditionally been seen as opposing ritual structures serving to undergird the distinction of “Vedic” and “Hindu.” Against such an icono- and theocentric approach, it proposes a history of the priesthood in relation to royal power, centering on the relationship between the royal chaplain (purohita) and astrologer (sāṃvatsara) as a crucial, unexplored development in early Indian religion. In order to capture these historical developments, it outlines a method for the comparative study of ritual forms over time.

Jesus in the World of Religions a Preliminary Plotting of a Route Map

1998 ◽  
Vol 5 (3) ◽  
pp. 311-334
Author(s):  
Gerhard Van Den Heever
Keyword(s):  
Comparative Study ◽  
The World ◽  
High Degree ◽  
The Relationship ◽  
Degree Of Similarity

AbstractIn a comparative study the issue is raised about the relationship between the construction of the saviour-image in Christianity, Buddhism, Zoroastrianism and Hinduism. The historical links between these traditions are highlighted and then the article proceeds to argue that when compared, the projections of the images of Jesus and Buddha, Jesus and Zoroaster and Jesus and Krishna exhibit a high degree of similarity. In the process questions are asked about the nature of religion and the value of comparative study.

Continuity and Peculiarities in Proto-Kazakh and Ancient Indian Early Religious Beliefs

2021 ◽  
Vol 3 (121) ◽  
pp. 185-195
Author(s):  
Zatov Zatov
Keyword(s):  
Comparative Analysis ◽  
Comparative Study ◽  
Ethnic Diversity ◽  
Life Forms ◽  
Religious Knowledge ◽  
Concept Of God ◽  
Common Features ◽  
The World ◽  
The Relationship ◽  
The Universe

A comparative study of the mythological picture of the world, early forms of religion allows us to identify common features characteristic of the worldview and spiritual guidelines of mankind as a whole. These features can be traced in archaic ideas about the structure of the universe, in understanding their spiritual and bodily essence, the infinity of God and the eternity of the soul, the relationship and interdependence of life forms in the world. This allows us to assert the thesis of the unity of mankind in its spiritual origins, despite racial and ethnic diversity. In the process of a comparative analysis of mythology, early forms of religion, the concept of God, the pantheon and the function of the gods, similar moments and ethnological specifics of understanding the essence of the soul and reincarnation in totemistic beliefs, in cosmological and theogonistic concepts are revealed.The author also analyzes the role and significance of the cult of ancestors, traces the evolution of the idea of proto-monotism (the creative function of Tengri and Brahma, the intention of henotheistic faith) and its place in religious knowledge.

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