News media bias in the case of George Zimmerman and Trayvon Martin The case of George Zimmerman and Trayvon Martin was a clear example of biased news reporting for the sake of sensationalism and higher ratings. Incompetence Wasn't the Problem in Broward County. Seventeen-year-old Miami-Dade student Trayvon Martin got neither incarceration nor education. For all the attention paid to the case, the media have refused to report why Martin was left to wander the streets of Sanford High and alone on a Sunday night during a school week.
A history of palynology[ edit ] Pollen core sampling, Fort Bragg, North Carolina Early history[ edit ] The earliest reported observations of pollen under a microscope are likely to have been in the s by the English botanist Nehemiah Grew who described pollen and the stamen, and concluded that pollen is required for sexual reproduction in flowering plants.
By the late s, as optical microscopes improved and the principles of stratigraphy were worked out, Robert Kidston and P. Reinsch were able to examine the presence of fossil spores in the Devonian and Carboniferous coal seams and make comparisons between the living spores and the ancient fossil spores.
Thesis statement for amber alert particular, his Kristiania lecture of was important in gaining a wider audience. The methodology of pollen analysis became widespread throughout Europe and North America and revolutionized Quaternary vegetation and climate change research.
There is a study of pollen samples taken from sediments of Swedish lakes by Trybom ;  pine and spruce pollen was found in such profusion that he considered them to be serviceable as " index fossils ".
Sarauw studied fossil pollen of middle Pleistocene age Cromerian from the harbour of Copenhagen. Weber appear to be among the first to undertake 'percentage frequency' calculations.
Hyde and Williams chose palynology on the basis of the Greek words paluno meaning 'to sprinkle' and pale meaning 'dust' and thus similar to the Latin word pollen. During her time as a student, she developed the first pollen diagram from a sample that depicted the percentage of several species at different depths at Curtis Bog.
This was the introduction of pollen analysis in North America  ; pollen diagrams today still often remain in the same format with depth on the y-axis and abundances of species on the x-axis. They are extracted from sedimentary rocks and sediment cores both physically, by ultrasonic treatment and wet sievingand chemically, by chemical digestion to remove the non-organic fraction.
Palynomorphs may be composed of organic material such as chitinpseudochitin and sporopollenin. Palynomorphs that have a taxonomy description are sometimes referred to as palynotaxa. Palynomorphs form a geological record of importance in determining the type of prehistoric life that existed at the time the sedimentary formation was laid down.
As a result, these microfossils give important clues to the prevailing climatic conditions of the time. Their paleontological utility derives from an abundance numbering in millions of cells per gram in organic marine deposits, even when such deposits are generally not fossiliferous.
Palynomorphs, however, generally have been destroyed in metamorphic or recrystallized rocks. Typically, palynomorphs are dinoflagellate cystsacritarchssporespollenfungiscolecodonts scleroprotein teeth, jaws and associated features of polychaete annelid wormsarthropod organs such as insect mouthpartschitinozoans and microforams.
Palynomorph microscopic structures that are abundant in most sediments are resistant to routine pollen extraction including strong acids and bases, and acetolysis, or density separation. Palynofacies[ edit ] A palynofacies is the complete assemblage of organic matter and palynomorphs in a fossil deposit.
The study of the palynofacies of a depositional environment of sediments can be used to learn about the depositional palaeoenvironments of sedimentary rocks. Palynofacies studies are often linked to investigations of the palynology and organic geochemistry of sedimentary rocks.
Palynofacies can be used in two ways: Organic palynofacies considers all the acid insoluble particulate organic matter POMincluding kerogen and palynomorphs in sediments and palynological preparations of sedimentary rocks.
The sieved or unsieved preparations may be examined using strew mounts on microscope slides that may be examined using a transmitted light biological microscope or ultraviolet UV fluorescence microscope. The abundance, composition and preservation of the various components, together with the thermal alteration of the organic matter is considered.
Palynomorph palynofacies considers the abundance, composition and diversity of palynomorphs in a sieved palynological preparation of sediments or palynological preparation of sedimentary rocks.
The ratio of marine fossil phytoplankton acritarchs and dinoflagellate cyststogether with chitinozoansto terrestrial palynomorphs pollen and spores can be used to derive a terrestrial input index in marine sediments. Both types of palynofacies studies are used for geological interpretation of sedimentary basins in exploration geology, often in conjunction with palynological analysis and vitrinite reflectance.Amber alert is making a difference in saving the lives of children Credibility: this is an interesting topic because of the fact that there are so many different types of cases involved Thesis: today I am going to inform you about what the amber alert is and how it works, why it was created as well as some of the different cases involved %(3).
The creation of Amber Alerts is rather interesting and as well as heartbreaking but first, let’s get an idea of what the Amber Alert is for. The amber alert is a notification system to law enforcement and the media about child abductions. Palynology is the "study of dust" (from Greek: παλύνω, translit.
palunō, "strew, sprinkle" and -logy) or "particles that are strewn".A classic palynologist analyses particulate samples collected from the air, from water, or from deposits including sediments of any age. The condition and identification of those particles, organic and inorganic, give the palynologist clues to the life.
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