ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Digitale Medien

Electron microscopic observations of the surface of L-cells in culture (1970)

Price, P. G.

Springer

The journal of membrane biology 2 (1970), S. 300-316

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1432-1424

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Summary Techniques are described for the preparation of preshadowed replicas of both the upper and lower surfaces of L-cells in culture, and of cross sections of L-cells growing on a cellophane substrate. These revealed long slender microvilli, 800 to 1,100 A in diameter, projecting from both upper and lower surfaces of the cells. These microvilli were frequently observed to contact other cells and substrate, and to leave material behind on the substrate. The plasma membrane of the lower surface was separated from the substrate by an electron-lucent gap 200 to 300 A wide. The surface coat of the L-cell was visualized by staining with colloidal iron and ruthenium. Staining with colloidal iron was most intense on the surface of the microvilli. The gap between cell and substrate was intensely stained with ruthenium red. Enzymatic digestion of living cells revealed that both trypsin and neuraminidase reduced the staining of the cell coat by colloidal iron, whereas only trypsin altered its staining with ruthenium red. After trypsin treatment, fragments of an amorphous material with the staining characteristics of the cell coat were observed between the denuded cells. Treatment with ribonuclease, chymotrypsin or hyaluronidase did not affect the staining of the cell coat.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01869866

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

2

Digitale Medien

The sterols of the echinoderm,Ctenodiscus crispatus retzius (1973)

Grossert, J. S. ; Mathiaparanam, P. ; Hebb, G. D. ; [weitere]

Springer

Cellular and molecular life sciences 29 (1973), S. 258-259

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1420-9071

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Zusammenfassung Aus dem SchlammsternCtenodiscus crispatus wurde ein kompliziertes Gemisch von Sterolen isoliert, die als Homologe des 5α-Cholest-7-en-3β-ols und deren 24-Methylderivate erkannt wurden.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01926460

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

3

Digitale Medien

Methods of sampling and analysis for predictive results in the introduction of entomophagous insects (1972)

Price, P. W.

Springer

BioControl 17 (1972), S. 211-222

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1573-8248

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Beschreibung / Inhaltsverzeichnis: Résumé Nous proposons ici des méthodes en vue d’une approche théorique du choix et de l’introduction d’Insectes entomophages. Une fois établis les besoins nécesaires aux organismes pour leur reproduction et leur survie, on choisit des sites afin d’échantillonner les Insectes en fonction des degrés d’un certain facteur critique. Quelle que soit la forme des gradients utilisés la répartition des échantillons doit être représentative des composantes du milieu. La distribution des entomophages d’après ces composantes est anlysée et quantifiée au moyen d’une formule qui montre l’aire de distribution d’un espèce, la similitude entre les distributions, et l’interaction à laquelle chaque espèce devra faire face dans chacun des groupes de composantes. Ces calculs peuvent être d’une grande utilité dans le choix de la meilleure espèce à introduire dans une région dont on connaît la composition et la distribution des espèces.

Notizen: Abstract Methods are proposed as a contribution towards the formalization of an approach to the selection and introduction of entomophagous insects. Once the critical resources necessary for the reproduction and survival of a predator or parasitoid have been identified, sites are arranged to sample these insects in different grades of the same critical factor. These grades of a resource may be ranked, and organized on gradients, or unranked, but in both cases the range of samples represents a resource set. The entomophagous insect distributions on these sets are analyzed and quantified by formulae that show the breadth of a species distribution, the similarity between distributions, and the interaction species will experience on each of the resource sets. These calculations can assist in selecting the best species for introduction into an area with a known species composition and distribution.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02371131

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

4

Digitale Medien

Genic variation in the deer mouse, Peromyscus maniculatus, in a small geographic area (1981)

Price, P. K. ; Kennedy, M. L.

Springer

Genetica 57 (1981), S. 65-74

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1573-6857

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Genic variation was examined with starch and polyacrylamide gel electrophoresis at 14 loci in 12 populations of Peromyscus maniculatus nubiterrae from a small part of the Appalachians in eastern Tennessee and western North Carolina. Polymorphism was observed at eight loci with no significant correlations between frequency of common genotypes or alleles and altitude. Average individual heterozygosity (\-H) values were low for P. maniculatus whether using only ‘slow’ evolving loci (mean = 3.0%) or both ‘slow’ and ‘fast’ evolving loci (mean = 4.9%). No significant correlation was present between altitude and \-H. Interlocality variation of \-H was as great in this study as previously reported for P. maniculatus over larger geographic areas. Rogers' coefficients of genetic similarity of paired combinations of populations based on ‘slow’ evolving loci (range of 0.941 to 0.997) or based on ‘slow’ and ‘fast’ evolving loci (range of 0.858 to 0.974) showed all populations to be highly similar. Ranges of similarity values observed in the present study were as great as those previously reported for P. maniculatus over a larger geographic area.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00057543

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

5

Digitale Medien

A cosmochemical view of cosmic rays and solar particles (1973)

Price, P. B.

Springer

Space science reviews 15 (1973), S. 69-88

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1572-9672

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The composition of cosmic rays and solar particles is reviewed with emphasis on the question of whether they are representative samples of Galactic and solar matter. The composition of solar particles changes with energy and from flare to flare. A strong excess of heavy elements at energies below a few MeV/nuc decreases with energy, and at energies above ∼15 MeV/nuc the composition of solar particles resembles that of galactic cosmic rays somewhat better than that of the solar atmosphere. The elements Ne through Pb have remarkably similar abundances in cosmic ray sources and in the matter of the solar system. The lighter elements are depleted in cosmic rays, whereas U and Th may be enriched or not, depending on whether the meteoritic or solar abundance of Th is used. Two prototype sources of cosmic rays are considered: gas with solar system composition but enriched in elements with Z 〉 8 during acceleration and emission (by analogy with solar particle emission), and highly evolved matter enriched in r-process elements such as U, Th and transuranic elements. The energy-dependence of cosmic ray composition suggests that both sources may contribute at different energies.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00172437

Permalink