Luminescence signals of quartz and feldspar as new methods for stratigraphic discrimination and provenance analysis of siliciclastic successions: the case of the Parnaíba Basin (Brazil) of West Gondwana

2021 ◽  
Author(s):  
Ian del Río ◽  
André O. Sawakuchi ◽  
Ana M. Góes ◽  
Maria Helena ◽  
B.M. Hollanda ◽  
...  
Keyword(s):  
Provenance Analysis ◽  
West Gondwana ◽  
New Methods ◽  
Parnaíba Basin

Unraveling the origin of the Parnaíba Basin: Testing the rift to sag hypothesis using a multi-proxy provenance analysis

2020 ◽  
Vol 101 ◽  
pp. 102625
Author(s):  
Rodrigo I. Cerri ◽  
Lucas V. Warren ◽  
Filipe G. Varejão ◽  
André Marconato ◽  
George L. Luvizotto ◽  
...  
Keyword(s):  
Provenance Analysis ◽  
Parnaíba Basin

Taphonomy of lacustrine fish fossils of the Parnaíba Basin, northeastern Brazil: Spatial and causative relations of Konservat Lagerstätten in West Gondwana during Jurassic-Cretaceous

2020 ◽  
Vol 542 ◽  
pp. 109602 ◽  
Author(s):  
Alexandre Ribeiro Cardoso ◽  
Guilherme Raffaeli Romero ◽  
Gabriel Ladeira Osés ◽  
Afonso César Rodrigues Nogueira
Keyword(s):  
Northeastern Brazil ◽  
West Gondwana ◽  
Parnaíba Basin

Terrestrial and marine palynomorphs from deposits of the pull-apart rift of West Gondwana (Parnaíba Basin, northern Brazil): Biostratigraphy and relation to tectonic events

2020 ◽  
Vol 101 ◽  
pp. 102612 ◽  
Author(s):  
Neila N. Ferreira ◽  
Elizabete P. Ferreira ◽  
Renato R.C. Ramos ◽  
Ismar de S. Carvalho
Keyword(s):  
West Gondwana ◽  
Tectonic Events ◽  
Northern Brazil ◽  
Parnaíba Basin

Evolution of Jurassic intertrap deposits in the Parnaíba Basin, northern Brazil: The last sediment-lava interaction linked to the CAMP in West Gondwana

2021 ◽  
pp. 110370
Author(s):  
Afonso Cesar Rodrigues Nogueira ◽  
Cleber Eduardo Neri Rabelo ◽  
Ana Maria Góes ◽  
Alexandre Ribeiro Cardoso ◽  
José Bandeira ◽  
...  
Keyword(s):  
West Gondwana ◽  
Northern Brazil ◽  
Parnaíba Basin

Mesozoic lacustrine system in the Parnaíba Basin, northeastern Brazil: Paleogeographic implications for west Gondwana

2017 ◽  
Vol 74 ◽  
pp. 41-53 ◽  
Author(s):  
Alexandre Ribeiro Cardoso ◽  
Afonso César Rodrigues Nogueira ◽  
Francisco Romério Abrantes ◽  
Cleber Eduardo Neri Rabelo
Keyword(s):  
Northeastern Brazil ◽  
West Gondwana ◽  
Parnaíba Basin

The Silurian glaciation in the eastern Parnaíba Basin, Brazil: paleoenvironment, sequence stratigraphy and insights for the evolution and paleogeography of West Gondwana

2020 ◽  
Vol 406 ◽  
pp. 105714
Author(s):  
Ivan Alfredo Romero Barrera ◽  
Afonso César Rodrigues Nogueira ◽  
José Bandeira
Keyword(s):  
Sequence Stratigraphy ◽  
West Gondwana ◽  
Parnaíba Basin

Replication of Wet Objects and Cells

1974 ◽  
Vol 32 ◽  
pp. 102-103
Author(s):  
S. Basu ◽  
D. F. Parsons
Keyword(s):  
Water Vapor Pressure ◽  
High Vacuum ◽  
Polystyrene Latex ◽  
Vacuum System ◽  
Saturated Water Vapor ◽  
Replication Method ◽  
New Methods ◽  
Saturated Water ◽  
Water Vapors ◽  
Intermediate Chamber

We are approaching the invasiveness of cancer cells from the studies of their wet surface morphology which should distinguish them from their normal counterparts. In this report attempts have been made to provide physical basis and background work to a wet replication method with a differentially pumped hydration chamber (Fig. 1) (1,2), to apply this knowledge for obtaining replica of some specimens of known features (e.g. polystyrene latex) and finally to realize more specific problems and to improvize new methods and instrumentation for their rectification. In principle, the evaporant molecules penetrate through a pair of apertures (250, 350μ), through water vapors and is, then, deposited on the specimen. An intermediate chamber between the apertures is pumped independently of the high vacuum system. The size of the apertures is sufficiently small so that full saturated water vapor pressure is maintained near the specimen.

A Freeze Shadow Technique for the Preparation of Soft Paint Latexes for Electron Microscopy

1977 ◽  
Vol 35 ◽  
pp. 314-315
Author(s):  
Earl R. Walter ◽  
Glen H. Bryant
Keyword(s):  
Sample Preparation ◽  
High Vacuum ◽  
Vacuum System ◽  
Latex Particles ◽  
New Methods ◽  
Diffusion Pump ◽  
Film Forming ◽  
Routine Basis ◽  
Distribution Studies ◽  
Preparation Techniques

With the development of soft, film forming latexes for use in paints and other coatings applications, it became desirable to develop new methods of sample preparation for latex particle size distribution studies with the electron microscope. Conventional latex sample preparation techniques were inadequate due to the pronounced tendency of these new soft latex particles to distort, flatten and fuse on the substrate when they dried. In order to avoid these complications and obtain electron micrographs of undistorted latex particles of soft resins, a freeze-dry, cold shadowing technique was developed. The method has now been used in our laboratory on a routine basis for several years.The cold shadowing is done in a specially constructed vacuum system, having a conventional mechanical fore pump and oil diffusion pump supplying vacuum. The system incorporates bellows type high vacuum valves to permit a prepump cycle and opening of the shadowing chamber without shutting down the oil diffusion pump. A baffeled sorption trap isolates the shadowing chamber from the pumps.

Directional observation on lipid of male nectary of Lindera megaphylla hemsl. by the rapid embedding method with polyethylene glycol (PEG)

1990 ◽  
Vol 48 (3) ◽  
pp. 718-719
Author(s):  
Dai Dalin ◽  
Guo Jianmin
Keyword(s):  
Electron Microscope ◽  
Polyethylene Glycol ◽  
Chemical Reaction ◽  
Traditional Method ◽  
Osmium Tetroxide ◽  
Unsaturated Lipid ◽  
Embedding Method ◽  
Long Period ◽  
New Methods

Lipid cytochemistry has not yet advanced far at the EM level. A major problem has been the loss of lipid during dehydration and embedding. Although the adoption of glutaraldehyde and osmium tetroxide accelerate the chemical reaction of lipid and osmium tetroxide can react on the double bouds of unsaturated lipid to from the osmium black, osmium tetroxide can be reduced in saturated lipid and subsequently some of unsaturated lipid are lost during dehydration. In order to reduce the loss of lipid by traditional method, some researchers adopted a few new methods, such as the change of embedding procedure and the adoption of new embedding media, to solve the problem. In a sense, these new methods are effective. They, however, usually require a long period of preparation. In this paper, we do research on the fiora nectary strucure of lauraceae by the rapid-embedding method wwith PEG under electron microscope and attempt to find a better method to solve the problem mentioned above.

Confronting the grey zone after severe brain injury

2019 ◽  
Vol 3 (6) ◽  
pp. 707-711 ◽  
Author(s):  
Andrew Peterson ◽  
Adrian M. Owen
Keyword(s):  
Brain Injury ◽  
Ethical Issues ◽  
Vegetative State ◽  
Clinical Care ◽  
Grey Zone ◽  
Severe Brain Injury ◽  
New Methods ◽  
Legal Decision Making ◽  
Technological Developments ◽  
The Brain

In recent years, rapid technological developments in the field of neuroimaging have provided several new methods for revealing thoughts, actions and intentions based solely on the pattern of activity that is observed in the brain. In specialized centres, these methods are now being employed routinely to assess residual cognition, detect consciousness and even communicate with some behaviorally non-responsive patients who clinically appear to be comatose or in a vegetative state. In this article, we consider some of the ethical issues raised by these developments and the profound implications they have for clinical care, diagnosis, prognosis and medical-legal decision-making after severe brain injury.

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