Close correspondence between the action spectra for the blue light responses of the guard cell and coleoptile chloroplasts, and the spectra for blue light-dependent stomatal opening and coleoptile phototropism.

Fluorescence spectroscopy was used to characterize blue light responses from chloroplasts of adaxial guard cells from Pima cotton (Gossypium barbadense) and coleoptile tips from corn (Zea mays). The chloroplast response to blue light was quantified by measurements of the blue light-induced enhancement of a red light-stimulated quenching of chlorophyll a fluorescence. In adaxial (upper) guard cells, low fluence rates of blue light applied under saturating fluence rates of red light enhanced the red light-stimulated fluorescence quenching by up to 50%. In contrast, added blue light did not alter the red light-stimulated quenching from abaxial (lower) guard cells. This response pattern paralleled the blue light sensitivity of stomatal opening in the two leaf surfaces. An action spectrum for the blue light-induced enhancement of the red light-stimulated quenching showed a major peak at 450 nm and two minor peaks at 420 and 470 nm. This spectrum matched closely an action spectrum for blue light-stimulated stomatal opening. Coleoptile chloroplasts also showed an enhancement by blue light of red light-stimulated quenching. The action spectrum of this response, showing a major peak at 450 nm, a minor peak at 470 nm, and a shoulder at 430 nm, closely matched an action spectrum for blue light-stimulated coleoptile phototropism. Both action spectra match the absorption spectrum of zeaxanthin, a chloroplastic carotenoid recently implicated in blue light photoreception of both guard cells and coleoptiles. The remarkable similarity between the action spectra for the blue light responses of guard cells and coleoptile chloroplasts and the spectra for blue light-stimulated stomatal opening and phototropism, coupled to the recently reported evidence on a role of zeaxanthin in blue light photoreception, indicates that the guard cell and coleoptile chloroplasts specialize in sensory transduction.

Correspondence between long-range and short-range spin glasses

We compare the critical behavior of the short-range Ising spin glass with a spin glass with long-range interactions which fall off as a power σ of the distance. We show that there is a value of σ of the long-range model for which the critical behavior is very similar to that of the short range model in four dimensions. We also study a value of σ for which we find the critical behavior to be compatible with that of the three-dimensional model, although we have much less precision than in the four-dimensional case.

Antonio Maura y el papel del II Reich en las negociaciones hispano-francesas sobre Marruecos de 1903-1904

En la primera parte del artículo se aborda el problema que ha de afrontar el estadista Antonio Maura al convertirse en el jefe del gobierno español, a finales de 1903 y consistente en concluir el proceso de negociación sobre Marruecos entablado con Francia desde 1901. Se resalta el carácter continuista del ideario colonial de Maura con respecto al del anterior líder conservador, Silvela, y la preponderancia de cuestiones como la seguridad nacional como motivadoras de dicho ideario. En la segunda parte, se explica la apelación del gobierno maurista a una ayuda por parte de Alemania, en función de movimientos previos de la diplomacia germana que se había interesado por controlar una parte del Marruecos español, o por conseguir compensaciones en Fernando Po. Finalmente se analiza el intento de Berlín de instrumentalizar al gobierno Maura en el curso de las conversaciones hispano-francesas sobre el Imperio jerifiano.

Correspondence with James Sullivan, 1789-1792

Includes one bill to James Sullivan for fees incurred by William Sullivan (AB 1792). Also includes receipt for payment.

[Correspondence originally sewn into the front of Volume 1], 1771-1783

This folder contains three letters originally sewn to the front inside cover of Volume 1 of Sewall's bound lectures (HUG 1782 Box 3). A fourth letter is still glued to the inside front cover and listed with the volume. The three letters consist of a letter from B. Kennicott to Stephen Sewall, May 14, 1771 and two letters written in French from Antoine Court de Gébelin to Stephen Sewall, one written on March 3, 1780, and the second received on November 18, 1783. The letter from Benjamin Kennicott acknowledges Sewall's letter to him and offers instructions for paying for a subscription to Kennicott's work. A portion of the missing text from Box 1 can be found in this folder.

Correspondence with Judge George Thatcher, 1789-1815

Correspondence from Tyng, who resided in Newburyport and Boston, to Congressman George Thacher of Maine, touching on a variety of political topics such as the judiciary act of 1789, the make-up of the United States Supreme Court, and the judges of the Massachusetts court system.

Chronological South American correspondence,

Four letters addressed to Tudor, one letter addressed to B. Llaveria. In Spanish.

Chronological South American correspondence,

Six letters in Spanish.

Tudor and Fenno family correspondence,

Correspondence to and from Tudor family members, mainly Frederic Tudor’s children. Includes letters to his wife Euphemia Fenno, and correspondence between her relatives.

Correspondence and documents of the Bigelow and Whitwell families,

Correspondence and documents related to the Scollay and Whitwell families, including cancelled checks and legal materials.

Miscellaneous correspondence,

Includes letters from John Jervis, 1st Earl of St. Vincent, to Admiral Isaac Coffin Bart in London, and several other unaddressed or unsigned letters, as well as a copy of William Cullen Bryant’s poem, "Robert of Lincoln."

Twentieth century manuscript copies of correspondence between Thaddeus William Harris and Edward Everett, 1847 August

One letter from Harris, the University Librarian, to President Everett, enclosed with a historical account of the Great Salt and its donor, Richard Harris, and sketches of the new engravings on the Great Salt, Stoughton Cup, and Browne Cup bearing donor names. Harris writes that he hopes to have his account of the Great Salt published in the Cambridge Chronicle and is gratified to hear of Everett’s plans to use an excerpt in his Commencement dinner speech. In a short note of reply, Everett writes that Harris’ account of the silver was "received with great favor" during the dinner.