منابع مشابه
The Trilobite: Enigma of Complexity
My goal in this presentation will be to explore the impact the discoveries of modern molecular biology have had on our understanding of the history of life on earth. I will demonstrate using a fundamental assumption of evolutionary theory, that we can know in exquisite detail, the molecular biology of one of the earliest form of metazoan life for which we have a consonant record, the Trilobite....
متن کاملThe Evolution of Trilobite Body Patterning
The good fossil record of trilobite exoskeletal anatomy and ontogeny, coupled with information on their nonbiomineralized tissues, permits analysis of how the trilobite body was organized and developed, and the various evolutionary modifications of such patterning within the group. In several respects trilobite development and form appears comparable with that which may have characterized the a...
متن کامل[Juxtaposition of the atrial appendages].
Six cases of juxtaposition of the atrial appendages are documented by necropsied specimens and analyzed. A high incidence of conotruncal anomalies, especially transposition of the great arteries, further A-V valve abnormalities, and pulmonary valve atresia, is found. The recognition of juxtaposition of the atrial appendages during cardiac catheterization should alert the investigator to the pre...
متن کاملRemoval of the Uterine Appendages
Nomenclature.?The want of a good name for this operation is already being felt. At first, when its object was supposed to be limited to the production of an artificial menopause, the operation was known as "normalovariotomy." Battey, who introduced the name, was among the first to recognise its unsuitability. As a matter of principle, the operation was by no means restricted to ovaries that wer...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Science
سال: 1884
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-3.57.279