Results 131 to 140 of about 337,815 (176)

Update of the scientific opinion on tetrabromobisphenol A (TBBPA) and its derivatives in food. [PDF]

EFSA J
EFSA Panel on Contaminants in the Food Chain (CONTAM), Schrenk D, Bignami M, Bodin L, Chipman JK, Del Mazo J, Grasl-Kraupp B, Hogstrand C, Hoogenboom LR, Leblanc JC, Nebbia CS, Nielsen E, Ntzani E, Petersen A, Sand S, Schwerdtle T, Wallace H, Benford D, Hart A, Schroeder H, Rose M, Vrijheid M, Kouloura E, Bordajandi LR, Riolo F, Vleminckx C.   +25 more
europepmc   +1 more source

Microplastics as emerging carcinogens: from environmental pollutants to oncogenic drivers. [PDF]

Mol Cancer
Mishra SK, Sanyal T, Kundu P, Kumar R, Ghosh D, Chakrabarti G, Sikdar N, Bhattacharya S, Paul S, Das A.   +9 more
europepmc   +1 more source

Update of the risk assessment of polybrominated diphenyl ethers (PBDEs) in food. [PDF]

EFSA J
EFSA Panel on Contaminants in the Food Chain (CONTAM), Schrenk D, Bignami M, Bodin L, Chipman JK, Del Mazo J, Grasl-Kraupp B, Hogstrand C, Ron Hoogenboom L, Leblanc JC, Nebbia CS, Nielsen E, Ntzani E, Petersen A, Sand S, Schwerdtle T, Wallace H, Benford D, Fürst P, Hart A, Rose M, Schroeder H, Vrijheid M, Ioannidou S, Nikolič M, Bordajandi LR, Vleminckx C.   +26 more
europepmc   +1 more source

Observations of a Dust Tail Gap in Comet C/2014 Q1 (PanSTARRS)

Icarus, 2023
Qasim Afghan, Andrew Coates, Geraint H. Jones   +2 more
exaly   +3 more sources

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Propagating Inhomogeneities in the Dust Tail of Comet West 1975

Nature, 1978
COMET West has displayed some remarkable properties. Sekanina1 has studied the multiple splitting of its nucleus and also discussed the strange structure of its dust tail. This tail is characterised by a system of bright bands which do not correspond to the true synchronous band2 and which are shown by very few comets.
Philippe Lamy, Serge Koutchmy
exaly   +2 more sources

Dust Tail of the Distant Comet C/1999 J2 (Skiff) [PDF]

Astronomy and Astrophysics, 2003
CCD observations of comet C/1999 J2 (Skiff) were made at the Pik Terskol Observatory on September 15, 1999. The 2-m telescope equipped with the two-channel focal reducer of the Max-Plank-Institute for Aeronomy was used to study the cometary environment.
P P Korsun
exaly   +2 more sources

The Striae in the Dust Tails of Great Comets — A Comparison to Various Theories

Astronomische Nachrichten, 1988
AbstractWe reanalyse positions and motion of the striae in the dust tails of the bright comets Mrkos 1957 V and West 1976 VI. Two theories are compared to the data: the high speed particle ejection theory of NOTNI (1964) and the two‐step kinematical sequence proposed by SEKANINA and FARRELL (1980) in their particle fragmentation theory.
P Notni
exaly   +2 more sources

Comet Dust Tail Analysis using the Finson-Probstein Model

2022
The fine-structure detail of several comet dust tails is analysed from amateur and professional comet images using the Finson-Probstein mdoel. Given the date and time of the image taken, the comet’s position in the sky is calculated using an open source algorithm [1] and the comet’s dust tail is simulated for that position and time.
Qasim Afghan, Geraint H. Jones, Oliver Price   +2 more
openaire   +2 more sources

The structure of dust tails of comets II. The tail and dust content of comet Arend-Roland

Chinese Astronomy and Astrophysics, 1983
Abstract The modified distribution function of dust particles, f(γ), which can be determined from tail brightness profiles on the basis of mechanical theory, is discussed with special regard to its reliability and accuracy. Physical significance of f(γ) is also discussed in terms of dust model parameters, and it is shown that f(γ), if treated ...
null Liu Cai-pin, null Kimura Hiroshi
openaire   +1 more source

On the Dust Tail of Comet Austin 1989c1

Publications of the Astronomical Society of Japan, 1990
Abstract A peculiar dust tail of Comet Austin 1989c1 was observed before its perihelion passage. A theoretical calculation indicates that the tail comprises large particles of millimeter-submillimeter size. The calculation also shows that these particles were ejected from ~ 1000 d before its perihelion passage.
Jun-ichi Watanabe, Mitsunori Tsumura, Ken Sugawara   +2 more
openaire   +1 more source