Cover crops, prepared by J. O. Morgan and W. S. Taylor.

Morgan, James Oscar.; Taylor, William

doi:10.5962/bhl.title.42949

Cited by 57 publications

(100 citation statements)

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“…Merrill and Burwell (1943) note the presence of bright Ha and Hei D3, with VIR < 1.0, in the spectrum of o Pup, and state that "the behavior of these lines resembles that in X Per MWC 78." Bright Fen lines of moderate strength were seen in the spectrum of o Pup by Morgan and Hansen (1946). Bright D3 was also observed, by the writer, in the spectrum of MWC 376 during 1968, and, more recently, bright H/3 and Hy have usually been the only features visible in the blue-violet spectral region.…”

Section: Veiling In Extreme Be Spectramentioning

confidence: 75%

On the Nature of X Persei: Evidence from the 1957 Outburst

Wackerling

1972

PASP

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In mid-1957 there occurred in the spectrum of the O star X Per, near the X-ray source 2U0352 + 30, abrupt changes in the emission-line radial velocities and V/fí ratios. The irregular variation of the V/fí ratio, also observed in the past by McLaughlin, suggests the occasional interruption of a more or less steady infall of material through the rotating emission region by outbursts of material from the star.The space velocity of X Per has been rederived, using a revised radial velocity, and compared to the space velocity of the runaway O star $ Per. The calculated closest approach of the two stars, to 17 pc separation, occurred 2.4 X 10 6 years ago.

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Section: Veiling In Extreme Be Spectramentioning

confidence: 75%

On the Nature of X Persei: Evidence from the 1957 Outburst

Wackerling

1972

PASP

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“…It has proved difficult to find alternative methods to the phenol extraction procedure which so readily yield products of comparable purity. Nevertheless, other methods, much less satisfactory from a practical point of view, give mucopolysaccharides closely similar in all the properties examined to the materials already described.2l , 22 As soon as the close physical and chemical similarity of the serologically different mucopolysaccharides was recognized, it was reasonable to suppose that the immunological specificity of each substance was associated with a relatively small part only of the whole macromolecule. On the basis of earlier and indirect evidence, which need not be discussed here, it seemed probable that it was the carbohydrate moiety of the macromolecule which was responsible for the specific immunological properties, and that differences in the carbohydrate components, such as the sugar sequence, their anomeric form and the position of the glycosidic linkages would ultimately determine these specific properties.…”

Section: The Mucopolysaccharide Components Of Ovarian Cyst M W I Nmentioning

confidence: 95%

Some Observations on the Carbohydrate‐containing Components of Human Ovarian Cyst Mucin

Morgan¹

1963

Annals of the New York Academy of Sciences

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The first chemical observations on the mucilaginous components of the secretions of the body were probably recorded in the middle of the last century when Scherer' published in a paper, Uber den JEiissigen Schleimstoff des tierischem Korpers. A few years later he described two substances in ovarian cyst fluids which he called "metalbumin" and "paralbumin." Eichwald2 reexamined these materials in Scherer's laboratory in Wurzburg, in 1865, and found that both substances released a sugar radical on heating with mineral acid. At that time it was not possible to identify the sugar released and any sugar radical set free was simply described as "reducing substance." These earlier studies were further extended by Hammarsten: who showed that Scherer's paralbumin was a mixture of albumin and metalbumin. The latter substance, called pseudomucin by Hammarsten, was rich in carbohydrate and was closely similar in many of its physical and chemical properties to other mucins, but differed from them in not being precipitated from solution by acetic acid. Hammarsten obtained pseudomucin from certain ovarian cyst fluids by heat coagulation of the protein present and concentration of the filtrate, which gave a ropy, viscous solution. To this day, when the fluid contents of cystadenomas are viscous and rich in carbohydrate, they are often called "pseudomucinous" in contradistinction to "serous" cysts, which contain only protein. Mitjukoff4 described a "trembling jelly" form of cyst mucin, called "paramucin," that was insoluble in water, but nevertheless contained a major carbohydrate component. From this time on many workers contributed information on the different ovarian cyst mucins, but a clearer understanding of these materials had to await developments in chemistry. By the turn of the century carbohydrate chemistry was firmly established and allowed workers in the field of mucin research to examine these biologically interesting materials and to study more exactly their composition and properties.Until recently the mucus secretions encountered in man and animals were studied almost exclusively by physiologists and pathologists, who were primarily interested in the function of these materials, and the term 'lmucin" was used to denote a viscous secretion, the chemical nature of which was in most instances largely unknown. Over the last two decades, however, an intensive study of the chemical, physical, and biological properties of the components of mucins of different origin of both human and animal source has taken place, and the present Conference will put on record the extent to which recent workers in this field have achieved success in elucidating the true nature and function of these biologically important materials.To account for the observed chemical and physical properties of mucins, it is essential to know something about the nature and amount of the components; this involves having available, or devising, suitable methods for the separation of the individual molecular species that are present. Evidence obtained by many...

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“…Other polysaccharides less well characterized chemically have been reported for the following types of bacteria: Brucella (49), typhoid (50) , paratyphoid (51), Pneumococcus (52) , dysentery ( 53), cholera (54), and Amylobacter (55).…”

Section: Synthetic Co"stituents Of the Culturementioning

confidence: 98%