Form: artificial

Apparently only a-terpinene and -y-terpinene have been found occurring naturally in essential oils. All the terpinenes are formed artificially from other terpinenes, or from geraniol, cineol, terpin hydrate, linalol, dihydro-carveol, and numerous other compounds. 

Oxidized cellulose Oxidized cellulose is a surgical gauze treated with nitrogen dioxide. Upon contact with tissue fluids, it forms artificial clots, which support mechanical hanostasis. 

Isotopes are atoms of the same elements having different mass numbers. Radioisotopes are the isotopes of an element that are radioactive or emit ionizing radiation. All elements are known to form artificial radioactive isotopes by nuclear bombardment. 

J R. Glauber was probably the first to form artificial niter beds. By throwing putrefiable matter of both vegetable and animal origin into pits and adding wood ashes, he obtained in due time a saltpeter eaith from which he extracted a solution which, on evaporation, yielded crystals of this salt. Glauber believed that the function of die putrid material was merely to draw the niter from the air (41). 

Two forms of boron nitride are known. The ordinary form is a slippery while matenul. The second, formed artificially at high pressures, is the second hardest substance known. Both remain as solids at temperatures approaching 3000 °C. Suggest structures. 

Scientists continue to look for new andbetter materials out of which to form artificial blood vessels. In 1990, for example, the biomedical company Organogenesis began testing a material they called living blood vessel equivalent (LBVE), whose structure mimics the three-layer structure of natural blood vessels. The three layers, consisting of en-... 

These biotechnologically formed artificial pipelines with an internal diameter of less than 3 mm (Fig. 14) were investigated for their application as a new type of biomaterial for surgery on microvessels (microsurgery). This work is characterized by an intensive cooperative effort between physicians, chemists and biologists. 

They can gather interstellar material together and form artificial stars. Miss Muxdroozol looks at Bob and the ants. What do you mean You mean they can create new stars ... 

Continuing the theme of saliva function, Chapter 3 describes environmental factors that affect the mineralization of hard tissue. The author describes in vitro investigations by himself and others on the relative roles of saliva and plaque fluid, and how the presence or absence of a biofilm affects the efficacy of anticaries agents. Other work focuses on the effects of lesion composition and of lesion proximity to dentine on subsequent enamel de- and remineralization behaviour. The author also discusses the importance of how the characteristics of pre-formed artificial lesions can influence subsequent mineralization behaviour in both in vitro and in situ studies. 

Dust is one of the most troublesome hazards associated with fillers. Thus, compressed (pelletized) fillers will become more important and wetting technology will be more extensively used. New developments in medical applications require compatibility of medical devices with tissues and body liquids. Advances are expected from the synthesis of inorganic materials which will form artificial surfaces which are less intrusive and which meet performance requirements. 

By definition, tungsten contains 74 protons in its nucleus besides 84 to 116 neutrons. Thirty-five isotopes (including isomers) are known. Five of them are naturally occurring the rest can be formed artificially and are unstable. Their half-life varies between milliseconds and more than 200 days. The characteristics of the natural and two of the more important artificial isotopes are listed in Table 1.1. More detailed information about the tungsten radioisotopes can be found elsewhere [1.4]. 

Amphoteric compounds with both polar and nonpolar structural components—interact with ergosterol in fungal membranes to form artificial pores, which disrupt membrane permeability. 

In forming artificial radioactive isotopes, problems of isolation are often encountered. For example, a product may decay quickly with the result that the initial product is contaminated with the daughter nuclide. 

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