PREFACE / PREFACIO Ichnology: modern and fossil evidence of biological activity
نویسندگان
چکیده
منابع مشابه
Genetic and fossil evidence for the origin of modern humans.
The origin of living Homo sapiens has once again been the subject of much debate. Genetic data on present human population relationships and data from the Pleistocene fossil hominid record are used to compare two contrasting models for the origin of modern humans. Both genetics and paleontology support a recent African origin for modern humans rather than a long period of multiregional evolutio...
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Since the mid 1990’s, the field of paleoherpetology in Germany has experienced a remarkable burst in research productivity and importance. In particular, young students were developing a new interest in the study of fossil amphibians and reptiles, paralleling a growing enthusiasm for new analytical tools and methodologies. One of the best signs of this “new movement” was the establishment and s...
متن کاملantioxidant and antimicrobial activity of allium jesdianum extract
چکیده بررسی فعالیت ضد اکسیدانی و ضدمیکروبی عصاره گیاه بن سرخ (allium jesdianum) به کوشش: زهرا مقیمی هدف از این تحقیق بررسی میزان ترکیبات فنولی کل، ترکیبات فلاوونوئیدی کل، فعالیت ضداکسیدانی و ضدمیکروبی عصاره ی گیاه تازه و خشک بن سرخ بود. استخراج عصاره به روش های غوطه وری، استفاده از همزن مغناطیسی، دستگاه مایکروویو، امواج فراصوت و گرمادهی مقاومتی و با استفاده از متانول، اتانول و آب به عنوا...
Exploring macroevolution using modern and fossil data.
Macroevolution, encompassing the deep-time patterns of the origins of modern biodiversity, has been discussed in many contexts. Non-Darwinian models such as macromutations have been proposed as a means of bridging seemingly large gaps in knowledge, or as a means to explain the origin of exquisitely adapted body plans. However, such gaps can be spanned by new fossil finds, and complex, integrate...
متن کاملHas the Combination of Genetic and Fossil Evidence Solved the Riddle of Modern Human Origins?
The rapid accumulation of new genetic data has not settled the issue of the origin of modern humans. However, the wealth of new data and theory has narrowed the range of models that researchers consider plausible. Any survey of the recent literature will reveal conflicting conclusions about the significance of the genetic evidence. These conclusions vary from statements that Multiregional Evolu...
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ژورنال
عنوان ژورنال: Boletín de la Sociedad Geológica Mexicana
سال: 2018
ISSN: 1405-3322
DOI: 10.18268/bsgm2018v70n2p1