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Observaciones sobre la morfología del Alto Gredos (1972)

MARTÍNEZ DE PISÓN, EDUARDO ; MUÑOZ JIMÉNEZ, JULIO

Madrid : Periodicals Archive Online (PAO)

Estudios geográficos. 33:129 (1972:nov.) 597

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ISSN: 0014-1496

Thema: Geographie

URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6094-1972-033-29-000002

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Un importante conjunto documental sobre la Geografía de la Circulación en España a finales del XVIII: el Interrogatorio de Juan Fermín de Garde (1972)

Muñoz Jiménez, Julio

Madrid : Periodicals Archive Online (PAO)

Estudios geográficos. 33:127 (1972:mayo) 355

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ISSN: 0014-1496

Thema: Geographie

Notizen: NOTICIAS Y COMENTARIOS

URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6094-1972-033-27-000004

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Digitale Medien

Isolation, partial characterization of the cytoplasmic membrane fraction of Streptomyces albus G and dd-carboxypeptidase localization (1972)

Muñoz, Emilio ; Marquet, Alberto ; Larraga, Vicente ; [weitere]

Springer

Archives of microbiology 81 (1972), S. 273-288

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ISSN: 1432-072X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary 1. Treatment of Streptomyces albus G with lysozyme (mg dry weight mycelium/mg lysozyme = 2–3/1) leads to the isolation of membrane fractions whose yields amount to 12–20% of the total celullar protein depending upon the age and state of the bacterial culture. 2. The isolated fractions are composed of 52.7 per cent protein and 41 per cent lipid with minor amounts of hexose (2.3–2.4%), hexosamines (1.6–2.1%), RNA (2%) and DNA (0.45%). They possess a chemical composition similar to that of other membrane systems. 3. NADH oxidase activities are associated with the membrane fractions from cells of 18–20 h of age. These activities are not detected in the membrane fractions from older cells. 4. All membrane fractions shape small vesicles. Differences in size and shape are, however, found between membrane preparations from cells of distinct ages. 5. dd-carboxypeptidase is not selectively localized in a membrane fraction of a certain age. The subcellular distribution of this activity is similar to that of other lytic endopeptidases of S. albus G. 6. The amounts of dd-carboxypeptidase associated with the various membrane fractions are variable and never very high. The specificity of the dd-carboxypeptidase activity associated with membrane fractions differs from that of the soluble enzyme. 7. These results are discussed in relationship with the carboxypeptidase-transpeptidase hypothesis (Leyh-Bouille et al., 1970).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00412246

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Digitale Medien

A bimodal temperature response and effect of light intensity in the photocontrol of germination of seeds in Jussiaea suffruticosa (1972)

Wulff, Renata ; Arias, Ingrid ; Ponce, Marisela ; [weitere]

Springer

Planta 107 (1972), S. 369-373

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ISSN: 1432-2048

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary A bimodal temperature response is observed in the germination of seeds in Jussiaea suffruticosa, both under continuous and cyclic light treatments. Germination exhibits two maxima at around 25° C and at 40°, and a minimum in the region of 30–35°. The response depends on light intensity both under continuous and intermittent light treatments. This dependence is much more noticeable in the region of minimum germination (30°). Both preincubation in darkness at 35° and high light intensities (15 500 lux) tend to eliminate the bimodal temperature response.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00386397

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