WebThe sporangia and spores were obtained from compression material of Marattia asiatica (specimen numbers PB18091 and PB18093) collected from the Lower Jurassic in Zigui County, westernHubei,China.SpecimensofM.asiaticawerepreserved in siltstone and mudstone and occur in the upper part of the Lower Jurassic Hsiangchi Formation, one of … WebJul 1, 2024 · Pollen grains strongly affect human health by inducing allergies. Although the monitoring of airborne pollens particles is of major importance, the current measurement methods are manually conducted and are expensive, limiting the number of monitoring stations. Thus, there is a need for relatively low-cost instruments that can work …
(PDF) Lower Jurassic spores and pollen grains from ... - ResearchGate
WebJun 1, 2010 · Two informal sporomorph assemblage zones can be distinguished in the dinosaur-bearing Tendaguru Beds of southeast Tanzanian. The first zone, the Classopollis—Araucariacites—Shanbeipollenites Assemblage Zone, ranges from the Lower to the Upper Saurian Bed, and a mid-Oxfordian to Tithonian age is suggested based on the … WebJan 1, 2015 · Spores and pollen grains directly relate to the reproductive stage in the life cycle of land plants also designated as embryophytes. Hence, the systematics of pollen … michael montes facebook
ULTRASTRUCTURE OF IN SITU MARATTIA ASIATICA …
WebDr. Ahmed Asker Najaf Al Ahmed Has been employed as an a lecturer of Geology, environmental pollution and industrial chemistry for the College of Science –University of Al Nahrain since 2006 .His prior experience includes 18 years as a site geologist in drilling wells for private sector and professor of organic Geochemistry in Thamar University … Web1.2 AIM AND OBJECTIVES. This study is primarily aimed at using palynomorphs (pollens and spores) in order to achieve the following objectives: To establish biostratigraphic zonation. To determine the relative age of the studied well ( age dating ) To interpret and reconstruct the depositional environments. WebAbstract. Spores and pollens refer to the reproductive cells of seed plants and asexually reproducing sporophytes, exhibiting a natural core–shell structure and exquisite surface morphology. They possess extraordinary dimensional homogeneity, porosity, amphiphilicity and adhesion. Their sporopollenin exine layer endows them with chemically ... michael montano md wasilla