On the effect of radium emanation on the vascular lumen

1926 ◽  
Vol 22 (11) ◽  
pp. 1201-1210
Author(s):  
A. N. Bykhovskaya
Keyword(s):  
Biological Effects ◽  
Theoretical Interest ◽  
Radioactive Elements ◽  
Radium Emanation ◽  
Vascular Lumen ◽  
The Future

The discovery of the radioactive elements had consequences far beyond the limits of this special field of radioactivity. In medicine, this discovery has already played an outstanding role and promises even greater prospects for the future. Therefore, the elucidation of the biological effects of radium preparations is of great practical as well as theoretical interest. This kind of research is particularly timely at this time.

scholarly journals Terpenoids and Their Biological Activities from Cinnamomum: A Review

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Meiting Wu ◽  
Lin Ni ◽  
Haixiao Lu ◽  
Huiyou Xu ◽  
Shuangquan Zou ◽  
...  
Keyword(s):  
Biological Activities ◽  
Biological Effects ◽  
Pharmacological Effects ◽  
Bioactive Components ◽  
Anticancer Activities ◽  
Chemical Structures ◽  
The Family ◽  
Beneficial Uses ◽  
The Future ◽  
Depth Study

Cinnamomum is a genus of the family Lauraceae, which has been recognized worldwide as an important genus due to its beneficial uses. A great deal of research on its phytochemistry and pharmacological effects has been conducted. It is noteworthy that terpenoids are the characteristic of Cinnamomum due to the peculiar structures and significant biological effects. For a more in-depth study and the better use of Cinnamomum plants in the future, the chemical structures and biological effects of terpenoids obtained from Cinnamomum were summarized in the present study. To date, a total of 181 terpenoids with various skeletons have been isolated from Cinnamomum. These compounds have been demonstrated to play an important role in immunomodulatory, anti-inflammatory, antimicrobial, antioxidant, and anticancer activities. However, studies on the bioactive components from Cinnamomum plants have only focused on a dozen species. Hence, further studies on the potential pharmacological effects need to be conducted in the future.

Hazards of Nuclear Fission Power and the Choice of Alternatives

1974 ◽  
Vol 1 (1) ◽  
pp. 21-30 ◽  
Author(s):  
John T. Edsall
Keyword(s):  
Energy Production ◽  
Nuclear Power ◽  
Large Scale ◽  
Biological Effects ◽  
Nuclear Fission ◽  
The United States ◽  
Radioactive Wastes ◽  
National Academy Of Sciences ◽  
The Future ◽  
Fission Power

Nuclear fission reactors are widely regarded as the chief energy source of the future. This article holds that the hazards of such reactors, in comparison with other prospective energy sources, are unacceptably high. The biological effects of ionizing radiations, as analyzed in the recent BEIR Report (1972) of a committee of the U.S. National Academy of Sciences, are briefly reviewed; the effects include genetic mutations, induction of cancer, and developmental abnormalities. Hazards are encountered at many stages in the process of nuclear power production: in the mining and processing of uranium, in the design and operation of the reactors, and in the handling, shipping, and storage, of the huge quantities of radioactive wastes produced by the reactors. Grave questions have been raised concerning the safety of the emergency core-cooling systems of present reactors; and the planned breeder reactors, which will contain great quantities of plutonium-239, are likely to be even more hazardous. Storage of radioactive wastes, away from all risks of environmental contamination, in order to be acceptable must be secure for about half-a-million years. No place on Earth has yet been found for which such safety can be guaranteed. Hazards of theft, sabotage, and war, are formidable threats to the future of nuclear fission power.Use of fission power is not compulsory; present supplies of coal are adequate for two or three centuries, though its mining and use will require drastic steps to protect the environment, thereby raising costs. Alternative, and far less dangerously polluting, sources of large-scale energy production exist or can be developed: notably solar energy and probably nuclear fusion, where intensive research gives high promise of adequate systems for large-scale energy production within 20–30 years. Geothermal energy, though more limited in amount, is also promising. Great savings can also be made by reducing the extravagant use of energy, especially in such countries as the United States; and various conservation measures are indicated.

scholarly journals The β-ray spectrum of mesothorium 2

1924 ◽  
Vol 106 (739) ◽  
pp. 632-640 ◽  
Keyword(s):  
Electronic Structure ◽  
Strong Evidence ◽  
Quantum Dynamics ◽  
Radioactive Elements ◽  
Radium Emanation ◽  
Γ Rays

In recent years much attention has been directed to the detailed study of the magnetic β-ray spectra of some of the radioactive bodies, since the lines in these β-ray spectra have been shown to be due to the quantum conversion of γ-rays into β-rays in their passage through the ordinary electronic structure of the atom. There is strong evidence that these γ-rays have their origin in the nucleus, and the frequency of some of them can be deduced from a study of the β-ray spectrum. Attention has been paid mainly to the radioactive elements radium B and radium C, as strong sources of these elements can be obtained by exposure to radium emanation. In particular, Ellis and Ellis and Skinner have analysed in detail the β-ray spectra of these elements, and have shown that the γ-rays from the nucleus can be accounted for as being due to transitions in a system of levels, indicating that the quantum dynamics is applicable to the nucleus.

Overview of hadron therapy: rationales, present status and future prospects

2001 ◽  
Vol 89 (4-5) ◽  
Author(s):  
D.T.L. Jones
Keyword(s):  
Neutron Capture ◽  
Epithermal Neutron ◽  
Biological Effects ◽  
Heavy Ion ◽  
Particle Therapy ◽  
Neutron Capture Therapy ◽  
Hadron Therapy ◽  
The Future ◽  
Charged Particle Therapy ◽  
Cure Rates

The rationales for hadron therapy are based on the physical selectivity and biological effects of the respective beams. Fastneutron therapy began as long ago as 1938 and subsequently proton, alpha particle, heavy ion, pion and neutron capture therapy have beenused. To date it is estimated that in excess of 50000 peoplehave undergone some form of hadron therapy. In the future it isexpected that fast neutron therapy will be used for selected tumourtypes for which neutrons are known to show improved cure rates. Thefuture trends in charged particle therapy will be driven by increasingcommercialization. The future of neutron capture therapy will dependon current clinical trials with epithermal neutron beams and thedevelopment of new tumour-seeking drugs.

scholarly journals The atomic weight of lead from samarskite

1918 ◽  
Author(s):  
◽  
Arthur Lowell Davis
Keyword(s):  
Atomic Weight ◽  
Radioactive Elements ◽  
Radium Emanation

Text from page 1: In the disintegration of the radioactive elements, since each a-transformation involves the loss of an atom of helium and nothing else which in weighable, the atomic weight of the product should be just 3.99 less than that of the origianl substance, since 3.99 is the atomic weight of the helium evolved during the a-transformation. Thus if radium has an atomic weight of 225.97, radium emanation, the result of the loss of one a-particle, should have an atomic weight of 221.98; radium D, involving the loss of three more a-particles, should be 210.01; and radium G, yet another a-transformation, hsould be 206.02.

Fractal Patterns Applied to Implant Surface: Definitions and Perspectives

2011 ◽  
Vol 37 (5) ◽  
pp. 506-509 ◽  
Author(s):  
David M. Dohan Ehrenfest
Keyword(s):  
Fractal Dimension ◽  
Biological Effects ◽  
Self Similarity ◽  
Implant Surface ◽  
The Future ◽  
Fractal Patterns ◽  
Definition Of ◽  
Atomic Crystal

Fractal patterns are frequently found in nature, but they are difficult to reproduce in artificial objects such as implantable materials. In this article, a definition of the concept of fractals for osseointegrated surfaces is suggested, based on the search for quasi-self-similarity on at least 3 scales of investigation: microscale, nanoscale, and atomic/crystal scale. Following this definition, the fractal dimension of some surfaces may be defined (illustrated here with the Intra-Lock Ossean surface). However the biological effects of this architecture are still unknown and should be examined carefully in the future.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Status of the Lick Proper Motion Program

1978 ◽  
Vol 48 ◽  
pp. 387-388
Author(s):  
A. R. Klemola
Keyword(s):  
Proper Motion ◽  
The Future

Second-epoch photographs have now been obtained for nearly 850 of the 1246 fields of the proper motion program with centers at declination -20° and northwards. For the sky at 0° and northward only 130 fields remain to be taken in the next year or two. The 270 southern fields with centers at -5° to -20° remain for the future.

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