The relative biological effectiveness of radiations of different quality
is examined in detail in this report. The analyses were performed
by Scientific Committee 40 of the NCRP which is charged with the
responsibility for analysis and evaluation of radiobiological data
relevant to radiation protection recommendations.
This report is a follow-on to the previous report of Scientific Committee
40 on its evaluation of the effects of dose rate which was
published in 1980 as NCRP Report No.
The state of aquatic ecosystems reflects the general state of the biosphere. The situation
in the biosphere affected by anthropogenic factors was characterized as “a slow
explosion” (Fedorov 1987). The global change in the biosphere and climatic system
of the Earth is a manifestation of this “slow explosion” (World Resources
1990–1991, Izrael et al. 1992).
Biological Effects of Surfactant-Containing Mixtures and Other Preparations
Along with the biological effects of individual chemicals, representatives of synthetic surfactants, it is also necessary to characterize the biological effects of mixtures that contain synthetic surfactants. One has to keep in mind permanently that real pollution of the environment is usually complex as mentioned in Patin (1979), Fedorov (1987), Filenko (1988), Venitsianov (1992), Losev et al. (1993), Bezel et al. (1994), and Krivolutsky (1994).
Biological Effects of Synthetic Surfactants and Participation of Hydrobionts in Water Purification
Experience indicates the negative impacts of surfactants and surfactant-containing preparations on representatives of the major functional ecosystemic blocks, including both autotrophic and heterotrophic organisms (see above). The author realizes that interpretation of the results obtained requires great caution and there are many factors that can affect the manifestation of biological effects of synthetic surfactants in more complex systems.
Plants defend themselves from other organisms by elaborating bioactive chemical
defences. This is the essential basis of the use of herbal medicines that still represents a
major therapeutic resort for much of humanity However, at the outset, it must be stated that
any plant that is not part of our evolved dietary cultures is potentially dangerous.
Commercial herbal medicinal preparations approved by expert regulatory authorities have a
significant place in mainstream conventional medicine and in complementary medicine.
This Report addresses in considerable detail the consequences of
hot particles on and near the skin, in the eye, ear, respiratory system,
and gastrointestinal tract. Limits for exposures from hot particles are
recommended. If exposures are maintained below the recommended
limits, few, if any, deterministic biological effects are expected to be
observed, and those effects would be transient in nature. If effects
from a hot-particle exposure are observed, the result is an easily
treated medical condition involving an extraordinarily small stochastic
Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : Phase I/II open-label study of the biologic effects of the interleukin-2 immunocytokine EMD 273063 (hu14.18-IL2) in patients with metastatic malignant melanoma
In this work we compared two plant ureases, jackbean
urease (JBU) and embryo-specific soybean urease (SBU)
and a bacterial (Bacillus pasteurii) urease, for kinetic
parameters and other biological properties described
recently for ureases that are independent of the ureolytic
activity. The insecticidal effect of ureases was investigated in
feedingtrials with the cotton sucker bug,Dysdercus peruvi-anus (Hemiptera) as an insect model. Contrastingwith
B. pasteuriiurease (PBU), both plant ureases presented
potent insecticidal activity, with LD50 values of 0.017%
(w/w) and 0.
Harrison's Internal Medicine Chapter 66. Stem Cell Biology
Stem Cell Biology: Introduction
Stem cell biology is a relatively new field that explores the characteristics and possible clinical applications of the different types of pluripotential cells that serve as the progenitors of more differentiated cell types. In addition to potential therapeutic applications (Chap. 67), patient-derived stem cells can also provide disease models and a means to test drug effectiveness.
Background Definitions Causation: degrees of certainty Pharmacovigilance and pharmacoepidemiology Classification Causes Allergy in response to drugs Effects of prolonged administration: chronic organ toxicity Adverse effects on reproduction
Cur'd yesterday of my disease I died last night of my physician.1 Nature is neutral, i.e. it has no 'intentions' towards humans, though it is often unfavourable to them.
Biological Activity of Waters Containing Anionic Surfactants
The effects of aquatic media containing anionic surfactants on organisms is of great hydrobiological and ecological interest as these xenobiotics are released to the hydrosphere in largest amounts as compared with other surfactants. In most if not all countries including Russia, anionic surfactants predominate among the synthetic surfactants produced and used. In some countries, production and consumption of anionic surfactants reached 65% (on a weight basis) of the total consumption of surfactants (for the U.S.
The technique can be applied for
chlorophyll level monitoring in basic photosynthesis research, agriculture, horticulture, and
forestry. Abiotic stress (water deficit, salinity, heat, heavy metals soil contamination, intense
light, etc) affects significantly crop growth and yield in agricultural areas all over the world.
Thus, it is imperative to study their effect upon the crops and discriminate among abiotic
stresses using new noninvasive and nondestructive remote sensing precision diagnostic
Biological signal analysis1 encompasses several interdisciplinary topics that deal with analysing
signals generated by various physiological processes in the human body. These signals could be
electrical, chemical or acoustic in origin and an analysis of these signals are often useful in
explaining and/or identifying pathological conditions of the human body. However, these signals in
their rawest form do not provide much information and therefore, the motivation behind biological
signal analysis is to extract (i.e. to reveal) the relevant information.
Biological Activity of Waters Containing Cationic Surfactants
Cationic surfactants along with anionic and nonionogenic surfactants are one of the main classes of surfactants. The proportion of cationic surfactants in the total volume of synthetic surfactants used in the economy is approximately equal to 22% (for the U.S.; Ainsworth 1992). Cationic surfactants enter aquatic ecosystems together with polluted waters because they are widely used in many industries including petroleum industry, oil refining industry, petrochemical industry, and gas industry.
Biological Activity of Waters Containing Nonionogenic Surfactants
Nonionogenic surfactants are second to anionic surfactants by the amount of their production and discharge into aquatic ecosystems (Surfactants 1984; Steinberg et al. 1995; Bailey 1996; Thiele et al. 1997). The main classes of nonionogenic surfactants are alcohol ethoxylates and oxides of fatty amines. In 1988, the worldwide annual consumption of nonionogenic surfactants belonging to the alkyl phenol ethoxylates was approximately equal to 360,000 tons (Ahel et al. 1993).
Physicists pretend not only to know everything, but also to know everything bet-
ter. This applies in particular to computational statistical physicists like US. Thus
many of our colleagues have applied their computer simulation techniques to
ﬁelds outside of physics, and have published sometimes in biological, economic
or sociological journals, and publication ﬂow in the opposite direction has also