Open Architecture SDR for Space

This paper describes an open-architecture SDR (software defined radio) infrastructure that is suitable for space-based operations (Space-SDR). SDR technologies will endow space and planetary exploration systems with dramatically increased capability, reduced power consumption, and significantly less mass than conventional systems, at costs reduced by vigorous competition, hardware commonality, dense integration, reduced obsolescence, interoperability, and software re-use. Significant progress has been recorded on developments like the Joint Tactical Radio System (JSTRS) Software Communication Architecture (SCA), which is oriented toward reconfigurable radios for defense forces operating in multiple theaters of engagement. The JTRS-SCA presents a consistent software interface for waveform development, and facilitates interoperability, waveform portability, software re-use, and technology evolution

Preimplantation expression of the somatic form of Dnmt1 suggests a role in the inheritance of genomic imprints

BACKGROUND: Identical DNA methylation differences between maternal and paternal alleles in gametes and adults suggest that the inheritance of genomic imprints is strictly due to the embryonic maintenance of DNA methylation. Such maintenance would occur in association with every cycle of DNA replication, including those of preimplantation embryos. RESULTS: The expression of the somatic form of the Dnmt1 cytosine methyltransferase (Dnmt1s) was examined in cleavage-stage preimplantation mouse embryos. Low concentrations of Dnmt1s are found in 1-, 2-, 4-, and 8-cell embryos, as well as in morulae and blastocysts. Dnmt1s is present in the cytoplasm at all stages, and in the nuclei of all stages except the 1-cell, pronuclear-stage embryo. The related oocyte-derived Dnmt1o protein is also present in nuclei of 8-cell embryos, along with embryo-synthesized Dnmt1s. Dnmt1s protein expressed in 1-cell and 2-cell embryos is derived from the oocyte, whereas the embryo synthesizes its own Dnmt1s from the 2-cell stage onward. CONCLUSION: These observations suggest that Dnmt1s provides maintenance methyltransferase activity for the inheritance of methylation imprints in the early mouse embryo. Moreover, the ability of Dnmt1o and Dnmt1s proteins synthesized at the same time to substitute for one another's maintenance function, but the lack of functional interchange between oocyte- and embryo-synthesized Dnmt1 proteins, suggests that the developmental source is the critical determinant of Dnmt1 function during preimplantation development

The Lantern Vol. 45, No. 1, November 1978

• Here is the Dance • To V.E.H. • The Hard Fist of the North • Early Ridicule • Spectrum - October 6, 1978 • Finally Someone Looks • Windjammer • Bereft • Waiting • Solitary Season • Drifting Downstream • The Dirtiest Joke • The Mannequin Factory • Me • When I am Famous • A Letter to John Hansen • Who Said the Sound of Laughter is Nice? • Throwing Back Her Hair • Don\u27t Let the Cold Become You • Sister • Marxist Drama • Fleeting Love • Music of Spain • (A Selection of Happy Poems) • Sterling St. Jacques • Winter, Verse II • Aventure Chez Le Psychiatre • For Marya • The Night Train • A Rude Awakeninghttps://digitalcommons.ursinus.edu/lantern/1113/thumbnail.jp

We Are History: The Outlines of a Quasi-Substantive Philosophy of History

In times of a felt need to justify the value of the humanities, the need to revisit and re-establish the public relevance of the discipline of history cannot come as a surprise. On the following pages I will argue that this need is unappeasable by scholarly proposals. The much desired revitalization of historical writing lies instead in reconciling ourselves with the dual meaning of the word history, in exploring the necessary interconnection between history understood as the course of events and as historical writing. Despite the general tendency of the last decades to forbid philosophizing about history in the former sense (at least in departments of history and philosophy), I think that to a certain extent we already do so without succumbing to substantive thought. We already have the sprouts of a speculative although only quasi-substantive philosophy of history that nevertheless takes seriously the postwar criticism of the substantive enterprise. In this essay I will first try to outline this quasi-substantive philosophy of history that attests to the historical sensibility of our times; and second, I will try to outline its consequences regarding history as historical writing. Finally, in place of a conclusion I will suggest that historical writing is not as much a contribution to public agendas as it is the very arena in which public life is at stake

The Lantern Vol. 45, No. 2, April 1979

• A Runner\u27s Motivation • For A Little While • Nameless • We Must Remain Liberal Minded • Solstice of Paradise • Sunset • One More Love Poem for an Imperiled Society • A Poor Winter Poem • A Parody • State Hospital • Long Distance Love • The ID • Cereal Art • Stepping Stones • Message to the Populace • Therefore Must We Yearn • Anticipation • Dregs • Band of Devilshttps://digitalcommons.ursinus.edu/lantern/1114/thumbnail.jp

The Lantern Vol. 45, No. 2, April 1979

• A Runner\u27s Motivation • For A Little While • Nameless • We Must Remain Liberal Minded • Solstice of Paradise • Sunset • One More Love Poem for an Imperiled Society • A Poor Winter Poem • A Parody • State Hospital • Long Distance Love • The ID • Cereal Art • Stepping Stones • Message to the Populace • Therefore Must We Yearn • Anticipation • Dregs • Band of Devilshttps://digitalcommons.ursinus.edu/lantern/1114/thumbnail.jp

The Lantern Vol. 46, No. 1, December 1979

• Visions in Chains • The Bean • Who Can We Watch Tonite? • Night Glider • The Hurricane • Crisp New Paper • Compassion • Loneliness • 301 • Ode to Man • Unsteady Hands • The Beachcomber • The Pounce • Graveyard Shift • Houston Refineries • Haiku • The End of the Game • A Rose • Ode to a Ziffle • To Carson McCullers • In the May Month • Ghostly Chanting • Travel Excerpts • Face in the Crowd • Waiting in an Airport • A Taste of Winter\u27s Embracehttps://digitalcommons.ursinus.edu/lantern/1115/thumbnail.jp

The Lantern Vol. 47, No. 1, December 1980

• Renewal • She Threw Down Her Diamond • Ragnarok • Cinquains • Euphoria • To the Nahua of the Valley of Mexico • Inamorata • Unspoken Passion • Clouds of Circus Cotton Candy Pink • The First Mate Finds a Captain (Almost) • Dance of Defiance • Concert • Blame • I\u27ve Seen That Movie Too • Greystone • The Philosophers of The Tower • Span • Commando • Cheshire • Summertime, Kryptonite and Falstaf(f) • Experience • Fluid Time • The Plight of Fred in Bed • A Way With Men • Courage to Love - (To A.) • Winter Sleep • Berniehttps://digitalcommons.ursinus.edu/lantern/1117/thumbnail.jp

The Lantern Vol. 47, No. 1, December 1980

• Renewal • She Threw Down Her Diamond • Ragnarok • Cinquains • Euphoria • To the Nahua of the Valley of Mexico • Inamorata • Unspoken Passion • Clouds of Circus Cotton Candy Pink • The First Mate Finds a Captain (Almost) • Dance of Defiance • Concert • Blame • I\u27ve Seen That Movie Too • Greystone • The Philosophers of The Tower • Span • Commando • Cheshire • Summertime, Kryptonite and Falstaf(f) • Experience • Fluid Time • The Plight of Fred in Bed • A Way With Men • Courage to Love - (To A.) • Winter Sleep • Berniehttps://digitalcommons.ursinus.edu/lantern/1117/thumbnail.jp