Nuclear Medicine Imaging and Therapy
Debbie Peet, Emma Chung in Practical Medical Physics, 2021
The 99Mo decays with a half life of 66 hours to 99mTc and so without elution, the amount of 99mTc within the generator is in dynamic equilibrium. In normal use, the generator is eluted daily. The 99Mo is usually replaced on a weekly or fortnightly basis as the eluted activity falls (Figure 5.4). Some 99Mo is found in the eluate, and Quality Control (QC) checks are required to ensure there is minimal “breakthrough” of the 99Mo and any aluminium. These checks are usually performed on the first elution of a generator, or if the generator is moved.
Reduction and Fixation of Sacroiliac joint Dislocation by the Combined Use of S1 Pedicle Screws and an Iliac Rod
Kai-Uwe Lewandrowski, Donald L. Wise, Debra J. Trantolo, Michael J. Yaszemski, Augustus A. White in Advances in Spinal Fusion, 2003
The terms stability and instability have been borrowed from mechanics, wherein they refer to the equilibrium state of either a rigid or an elastic body [34,35]. A body is conventionally regarded as rigid when the mechanical analysis focuses on the variations of the body’s rest or motion state that are caused by forces acting on the body itself. Conversely, a body is conventionally defined as elastic when the mechanical analysis concentrates on stresses and strains caused by forces acting on the body itself. In the case of a rigid body, a static and a dynamic equilibrium are distinguished depending on the body being at rest or in motion; the static or dynamic equilibrium can be further subdivided into a stable, unstable, and neutral equilibrium. In the case of an elastic body, stable or unstable equilibria are similarly distinguished.
Taoism
Steven L. Jeffers, Michael E. Nelson, Vern Barnet, Michael C. Brannigan in The Essential Guide to Religious Traditions and Spirituality for Health Care Providers, 2012
• Yin/Yang – The ancient Taoist perspective is that the universe emerged from an unimaginable unity that gives birth to all things. All things born of this oneness have their relative, contrasting, and complementary natures, or yin and yang aspects. The manifested universe of yin and yang obey natural laws that can be seen in every aspect of life, whether in the movement of the cosmos or in the life of the cell. It is like a magnet. To create a complete circuit one needs a north and south pole which attract each other and complete each other. This results in the Tai Ji principle, the maintenance of a dynamic equilibrium of opposites. As an overly strong action in any one direction invites a strong reverse response (like two north ends of the magnet repelling one another), the moderation of harshness and the cultivation of gentleness can be applied to smooth the path of life. Thus, the recognition of the hidden opposite in any situation fosters a broader perspective on what might be considered “good” or “bad” fortune. This has led to an appreciation of how aggressive or violent energy sows the seeds of its own demise, whereas gentleness and quietude tend to produce less stress, less wear and tear, thus promoting endurance and longevity.
Going Back to Normal
Published in Issues in Mental Health Nursing, 2021
Jacquelyn H. Flaskerud
At first glance, the concept of homeostasis seems to support the notion that we can avoid change. Homeostasis, from the Greek words for "same" and "steady," refers to any process that living things use to actively maintain fairly stable conditions necessary for survival (Rodolfo, 2000). If homeostasis is successful, life continues; if unsuccessful, disaster or death ensues. The stability attained is actually a dynamic equilibrium(often depicted as scales in balance), in which continuous change occurs yet relatively uniform conditions prevail. Any system in dynamic equilibrium tends to reach a steady state, a balance that resists outside forces of change (Rodolfo, 2000). The control of body temperature in humans is a familiar example of homeostasis in a biological system (Sadava et al., 2009). The human body maintains steady levels of temperature and other vital conditions such as the water, salt, sugar, protein, fat, calcium, and oxygen contents of the blood (Sadava et al., 2009).
Verification of a dose rate-responsive dynamic equilibrium model on radiation-induced mutation frequencies in mice
Published in International Journal of Radiation Biology, 2019
Yuichi Tsunoyama, Kazuyo Suzuki, Miwako Masugi-Tokita, Hiroo Nakajima, Yuichiro Manabe, Takahiro Wada, Masako Bando
In the field of the radiation safety protection and legal regulations, it is assumed based on the LNT model that the risk of cancer or the genetic effect would occur even in the case of very low dose exposure. From the viewpoint of the safety management, risk assessment using the LNT model is concise, easy to understand and have a certain rationality. However, such assessment by the LNT model is quite different from the fact, since it is completely ignored well-known mechanisms to eliminate abnormalities in living organisms. The LNT model does not take into account homeostasis which is essential for all organisms. Most of mechanisms related to metabolisms and biological reactions are always in dynamic equilibrium. At least in the low dose and low dose-rate exposure, various mechanisms for maintaining the biological functions and morphologies in organisms should be considered. If it is presupposed that such mechanisms are inherent in the body, it seems reasonable to make a risk assessment that emphasizes the dose-rate rather than the total dose of exposure.
Work-life balance: choose wisely
Published in Seminars in Ophthalmology, 2022
Mohammad Javed Ali
The American Author Gary Keller once said, ‘Work is a rubber ball. If you drop it, it will bounce back. The other four balls – family, health, friends, integrity are made of glass. If you drop one of these, it will be irrevocably scuffed, nicked, perhaps even shattered’. The COVID-19 pandemic has given us another opportunity to reflect on our work-life balance (WLB) arrangements. The term WLB connotes relative allocation of time and resources to professional and personal activities. A ‘poor WLB’ generally implies a heavy emphasis on work-related activities over others like relationships, caregiving, activities for one’s physical fitness, mental health, and hobbies/relaxing time. The definition and the extent of what constitutes a good or bad WLB are subjective. The WLB, however, does not imply efforts to maintain an exact equilibrium or that you can have it all. It simply means efforts to create a dynamic equilibrium. The WLB can be assessed through many of its subsets like work-family balance (WFB) and work-health balance (WHB).1
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