Minimum water input event for seedling emergence of three native perennial grasses of the Central Monte desert (Argentina) influenced by the effect of shade and the season of the year

In deserts, seedling emergence occurs only after precipitation threshold has been exceeded, however, the presence of trees modifies microenvironmental conditions that might affect the effectiveness of a water pulse. In the Monte desert, Prosopis flexuosa trees generate different micro-environmental conditions that might influence grass seedlings establishment. The objective of this work was: a) to know the effective minimum water input event that triggers the emergence of native perennial grass seedlings; b) to relate this fact with the effect of the shade of P. flexuosa canopy and the seasonal temperatures. Three important forage species of the Monte were studied: Pappophorum caespitosum and Trichloris crinita, with C4, and Jarava ichu, with C3 metabolism. Each season, seeds of these species were sown in pots placed at two light conditions: shade (similar to P. flexuosa cover) and open area, and with seven irrigation treatments (0, 10, 20, 30, 40, 2*10 and 3*10 mm). J. ichu did not emerge in any of the treatments. Significant seedling emergence was registered for P. caespitosum and T. crinita in shade conditions with 40 mm irrigation treatment in summer. Since 40 mm precipitation events are infrequent in the Monte, seedling emergence for these species would be restricted to exceptional rainy years. The facilitating effect of P. flexuosa shade would be important during the hot season.

Diversity and identification of heterotrophic bacteria from Antarctic Rocks of the McMurdo Dry Valleys (Ross Desert)

Diversity of endolithic Dry Valley rock microorganisms was studied by evaluating the presence of morphotypes in enrichments. Storage of rock samples for 16 h over dry ice affected the diversity of endolithic organisms, especially that of algae and fungi. Diversity in various samples depended on rock location and exposure, on the rock type, and to some extent on the pH of the pulverized rock samples. In most cases sandstone contained more morphotypes than dolerite or granite. Presence of many different phototrophs resulted in greater diversity of the heterotrophs in the enrichments. Samples from Linnaeus Terrace and Battleship Promontory had higher morphotype (MT) numbers than those from more exposed sites such as New Mountain, University Valley, Dais, or Mt. Fleming. Beacon sandstone (13 samples) from Linnaeus Terrace varied greatly with respect to MT numbers, although the pH values ranged only from 4.2-5.3. The highest MT number of 24 per sample was obtained from the upper surface of a flat boulder tilted to the North. Only two MT's were found in a hard sandstone sample from the wind-exposed and more shaded east side of the Terrace. 15 sandstone samples from Battleship Promontory contained more diverse populations: there occurred a total of 131 different MT's in these samples as compared to only 68 in Linnaeus Terrace samples. Cysts of colorless flagellates were found in some Battleship Promontory samples; rnost samples were populated with a wealth of different cyanobacteria. Studies on the distribution of actinomycete morphotypes in Linnaeus Terrace sandstone revealed great differences between individual boulders. Identification tests and lipid analyses made with representative strains of the isolated 1500 pure cultures led to genus names such as Caulobacter, Blastobacter, Hyphomicrobium, Micrococcus, Arthrobacter, Brevibacterium, Corynebacterium, Bifidobacterium, Mycobacterium, Nocardia (Amycolata), Micromonospora, Streptomyces, Blastococcus, and Deinococcus. Our data demonstrate the great diversity of Antarctic endolithic microbial populations.

Oasis. La casa Loewy en el desierto de Palm Spring = Oasis. Loewy House in the Desert of Palm Spring

En los tiempos de la optimista eclosión del Estilo Internacional en América y del comienzo de una nueva domesticidad en California, la peculiar mirada que hiciera el fotógrafo Julius Shulman de la casa Loewy, construida por Albert Frey en el desierto de Palm Springs en 1947, nos permite reconocer las claves de una excepcional pieza de arquitectura. La simbiótica aportación que hiciera Loewy junto a Frey permite superar ampliamente los rigurosos estándares de lo moderno y consigue exaltar el hedonismo de la cultura del bienestar de la posguerra americana. Atmósfera e intención se unen en una fantástica creación tanto de un espacio como de un tiempo.

Desert tortoise habitat conservation : hearing before the Subcommittee on Forests and Public Land Management of the Committee on Energy and Natural Resources, United States Senate, One Hundred Seventh Congress, first session, on H.R. 880, to provide for the acquisition of property in Washington County, Utah, for implementation of a desert tortoise habitat conservation plan, May 10, 2001.

Shipping list no.: 2001-0272-P.

The failure of the Queen's colleges, and of mixed education in Ireland.

Mode of access: Internet.

The Private life of the queen /

"With illustrations (from photographs by Messrs. W. & D. Downey, H.N. King, and Hughes & Mullins)."

The Ontario reports : containing reports of cases decided in the Queen's Bench and Chancery Divisions of the High Court of Justice for Ontario.

Imprint varies.

Calendar of the state papers relating to Scotland and Mary, Queen of Scots, 1547-1603, preserved in the Public Record Office, the British Museum, and elsewhere in England.

Editors: v. 1-2, J. Bain.--v. 3-9, W. K. Boyd.--V. 10, W. K. Boyd and H. W. Meikle.--v. 11, A. I. Cameron.--v. 12, M. S. Guiseppi.--v. 13, J. D. Mackie.

Tertiary echinoids of the Carrizo Creek region in the Colorado Desert.

Mode of access: Internet.

If you're waking call me early = The Queen of May : song /

For voice and piano.

The history of the affairs of chuch and state in Scotland, from the beginning of the reformation in the reign of King James V. to the retreat of Queen Mary into England, anno 1568.

"Appendix, containing the original papers and records ... ": p.[1]-258 at end.

The Opening of the Great Exhibition by Queen Victoria on 1 May 1851

Henry Courtney Selous; 5 ft. 6 47/64 in.x 7 ft. 11 15/64 in.; oil on canvas

The court of Queen Mab: containing a select collection of only the best, most instructive, and entertaining tales of the fairies: viz. 1. Graciosa and Percinet. 2. The fair one with golden locks. 3. The blue bird. 4. The invisible prince. 5. The princess Vereneta. 6. The princess Rosetta. 7. The golden bough. 8. The orange tree and the bee. 9. The little good mouse.

Mode of access: Internet.

The nullity of the government of Queen Victoria in Ireland, or, The pope the virtual ruler of the land : Being an exhibition of the laws of the papacy, set up by the Romish bishops to subvert the authority of their lawful sovereign, in 1832 /

Mode of access: Internet.