Search Results - (Author, Cooperation:Janssen)

Janßen, Anne

Unknown

150 S.

Oldenburger Vor-Drucke 368

Janssen, Bernd

Unknown

192 S.

Erw. und überarb. Auflage

3141620636

German

Gropengießer, Harald; Janßen-Bartels, Anne; Sander, Elke

Unknown

240 S.

3761425651

German

Janssen, Bernd

Unknown

179 S., Ill., graph. Darst., Tab.

3434201041

Modelle für den politischen und sozialwissenschaftlichen Unterricht : Neue Folge Modell 32

Janssen, Jakob [Verfasser]

Book

253 S., überw. Ill.

Fagus-Bücher

German

Janssen, Gabriele [Verfasser]

Book

260 Seiten :, Illustrationen ;, 21 cm

9. Auflage

9783609656915

German

Janßen, Willfried; Poenicke, Hans-Walter

Book

144 S.

3871163139

German

Janßen, Willfried; Poenicke, Hans-Walter

Book

144 S.

3871163120

German

0003-2670

Enzymatic methods ; Glucose ; Oxygen ; Solubility

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Chemistry and Pharmacology

Electronic Resource

0302-4598

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Biology

Chemistry and Pharmacology

Physics

Electronic Resource

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] Our strategy to find new anti-HIV compounds with acceptable pharmacology started with the selection of 600 molecules, all prototypes of different chemical series, which were without effect in standard pharmacological assays9 and caused only mild toxic-ity in rodents. They were assayed for ...

Electronic Resource

1432-2242

Key words Introgression ; Potato resistance breeding ; Solanum fendleri ; S. stoloniferum ; S. hougasii

Springer Online Journal Archives 1860-2000

Biology

Abstract  The inheritance of resistance to Meloidogyne chitwoodi and M. fallax in Solanum fendleri, S. hougasii and S. stoloniferum was studied assuming disomic behaviour of these polyploid Solanum species. Various populations were produced from crosses within the wild Solanum species; resistant×susceptible and reciprocal crosses (F1), self-pollinations (S1), testcrosses (TC) and self-pollinations (F2) of resistant hybrids, if possible. For the test crosses with S. hougasii, susceptible genotypes of S. iopetalum were used. In seedling tests, numbers of egg masses were counted after inoculation with M. chitwoodi or M. fallax. Almost all seedlings of the F1 and S1 populations of S. fendleri appeared to be resistant, whereas the TC and F2 populations of three different resistant hybrid genotypes segregated into resistant (having 1 or no egg mass) and susceptible plants (having more than 1 egg mass) at ratios of 1:1 and 3:1, respectively. The results clearly indicate the action of a single dominantly inherited gene, and the symbol R Mc2 is proposed for this gene. In the case of S. hougasii, F1 and S1 seedlings appeared to be mostly resistant. Difficulties were met in producing TC and F2 populations, and only four TC populations were obtained, which segregated at a 1:1 ratio. These results also indicate the presence of a simple dominant factor. For both S. fendleri and S. hougasii no differences were observed between M. chitwoodi and M. fallax, indicating that resistance genes are the same for both nematode species. The F1, S1 and TC populations of S. stoloniferum segregated for the square root number of egg masses into normal-like distributions, which deviated between the Meloidogyne species used. The patterns indicate the presence of several additive genes and one or more genes effective to M. fallax but not to M. chitwoodi. The relationship of resistance genes present in various Central American Solanum species is discussed.

Electronic Resource

1432-2242

Key words EBN ; In vitro seed culture ; Potato breeding

Springer Online Journal Archives 1860-2000

Biology

Abstract  Crossing experiments were conducted to introduce resistance to the root-knot nematodes, Meloidogyne chitwoodi and M. fallax, from various polyploid Central American Solanum spp. into the cultivated potato, S. tuberosum ssp. tuberosum. The most effort was put into producing tetraploid hybrids through inter-EBN (Endosperm Balance Number) crosses. From the crosses of tetraploid S. tuberosum (4 EBN) with tetraploid S. stoloniferum and S. fendleri (both 2 EBN), few seeds were derived that led to viable plants. In vitro culture of immature seeds also yielded several hybrid plants. From crosses of diploid S. tuberosum (2 EBN) with hexaploid S. hougasii (4 EBN) four hybrids were obtained through in vitro culture. Backcrosses were made with selected hybrids and a variable number of seeds was produced depending on the hybrid genotype. The successful introgression of resistance into backcross populations is shown. A scheme is presented for the introgression of traits at a tetraploid level from allotetraploid Solanum species into autotetraploid S. tuberosum through sexual crosses. The relevance of EBN for potato breeding is discussed.

Electronic Resource

1871-4528

genetic variation ; resistance screening ; Solanum tuberosum L.

Springer Online Journal Archives 1860-2000

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Summary Various methods of screening for resistance to root-knot nematodes were compared and evaluated. Seedling populations ofSolanum spp., grown in clay pots and plastic tubes with silver sand and inoculated with juveniles ofMeloidogyne chitwoodi andM. hapla, showed large differences in the number of egg masses on roots 7 weeks after inoculation. The differences were reproducible when re-testing was done with cuttings and plants from tubers. No resistance toMeloidogyne spp. was observed with ten potato cultivars when grown in clay pots, plastic tobes or closed containers. Plants from tubers in growth pouches developed a large two-dimensional root system, and after inoculation with juveniles the infection process could be observed over 8 weeks. A method of infecting potato tuber tissue withMeloidogyne is described, using tuber slices in Petri dishes as a potential screening test for tuber resistance.

Electronic Resource

1573-8469

breeding ; genetic variation ; potato ; resistance management ; selection

Springer Online Journal Archives 1860-2000

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Abstract In 1995 two fields in the Netherlands, naturally infested withMeloidogyne hapla (Wageningen) andM. fallax (Baexem), were used to evaluate resistant and susceptibleSolanum genotypes under natural conditions. In April, genotypes were planted in circular microplots. Soil samples were taken and analyzed for the occurrence of second-stage juveniles every six weeks. From August onwards, large differences between resistant and susceptible genotypes in numbers of juveniles were found in the soil. For all resistant wildSolanum genotypes the level of infection in soil at the end of the growing season in October was equal to or lower than at the beginning. Glasshouse experiments were performed with the same genotypes and nematode populations (i.e. originally derived from these fields) and the results were comparable with the observations from the field. It is concluded that resistance, as selected in glasshouse trials, corresponds well with resistant behaviour in the field and that it is worthwhile to transfer the resistance from theseSolanum sources to commercial potato cultivars for successful control of root-knot nematodes.

Electronic Resource

1435-1528

Springer Online Journal Archives 1860-2000

Chemistry and Pharmacology

Physics

Zusammenfassung Es wird ein einfaches Modell des Faserwachstums aus einer strömenden Lösung vorgestellt. Dabei werden vor allem drei wesentliche Aspekte betrachtet: die Strömungsmechanik, die molekulare Struktur und Thermodynamik der Flüssigkeit, sowie das Kristallwachstum selbst. Obgleich wegen der noch bestehenden Unsicherheiten nur größenordnungsmäßige Abschätzungen in Ansatz gebracht werden konnten, war es dennoch möglich, quantitative Aussagen über den Wachstumsvorgang zu erhalten.

Summary An engineering model of fiber growth from a flowing solution is presented. Attention is focussed on three main issues: the fluid mechanics, the molecular structure of the fluid, coupled with the thermodynamics, and the crystal growth itself. Although because of existing uncertainties order of magnitude analyses had to be adopted it was possible to obtain quantitative predictions about the growth process.

Electronic Resource

1573-5060

AFLP ; CAPS ; comparative mapping ; marker assisted selection ; Meloidogyne ssp.

Springer Online Journal Archives 1860-2000

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Abstract A PCR-based assay has been developed for marker assisted selection of root-knot nematode resistance ( Rmc1) in potato. To this end, a comparative genome analysis was carried out between Solanum bulbocastanum and S. tuberosum to identify PCR-based chromosome 11 alleles linked to Rmc1. The use of co-migrating AFLP markers, obtained by using primer combinations previously applied for AFLP analysis of the S. tuberosum genome, failed to align the AFLP map of the S. bulbocastanum genome with the S. tuberosum map. Apparently, the S. bulbocastanum genome is genetically too distantly related to the S. tuberosum genome for this type of analysis. Cleaved amplified polymorphic sequence (CAPS) markers were more readily applied for a comparative analysis within the region of interest. Rmc1 could be localized within a 4 cM interval between markers CT182 and M39b. It is demonstrated that the resistance spectrum of Rmc1 includes not only Meloidogyne chitwoodi and the related species M. fallax but also a genetically distinct population of M. hapla. The cost-efficiency of the CAPS markers applied for Rmc1 renders this approach as an attractive alternative for screening large segregating populations of potato for root-knot nematode resistance.

Electronic Resource

1573-5060

genetic variation ; potato ; root-knot nematodes ; co-evolution ; introgression ; Meloidogyne chitwoodi ; Solanum tuberosum

Springer Online Journal Archives 1860-2000

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Summary Over 5000 plants from 64 tuber-bearing wild Solanum spp. have been individually screened for resistance to Meloidogyne chitwoodi, M. fallax and M. hapla. Seedlings were analyzed by means of counting number of egg masses and resistance was verified by retesting low-scoring plants using stem cuttings. Resistance to both M. chitwoodi and M. fallax was observed in S. bulbocastanum, S. cardiophyllum, S. brachistotrichum, S. fendleri and S. hougasii. Only in S. chacoense and to a lesser extent in S. stoloniferum and S. gourlayi differential results between M. chitwoodi and M. fallax were observed. Resistance to M. hapla was found in S. bulbocastanum, S. brachistotrichum, S. cardiophyllum, S. arnezii, S. chacoense, S. tarijense, S. boliviense, S. gourlayi, S. microdontum, S. sparsipilum, S. spegazzinii, S. sucrense, S. acaule and S. hougasii. The occurrence of resistance in wild Solanum species in relation to their taxonomic status and the implications for introgression of resistance into S. tuberosum are discussed.

Electronic Resource

2020-04-20

"Der Katalog überwachungsbedürftiger Anlagen des Geräte- und Produktsicherheitsgesetzes bzw. der Betriebssicherheitsverordnung legt fest, für welche besonders gefährlichen Arbeitsmittel und Anlagen spezielle Prüfungen durch Prüfstellen (Zugelassene Überwachungsstellen) vorgeschrieben sind. Die Dynamik der technischen Entwicklung verlangt eine Überprüfung und Aktualisierung dieses Katalogs und der Prüfungsanforderungen. Der Bericht beschreibt eine im Rahmen eines Forschungsprojekts des Bundesministeriums für Arbeit und Soziales entwickelte und an Beispielen erprobte Methodik, mit deren Hilfe der Ausschuss für Betriebssicherheit das von Arbeitsmitteln und Anlagen ausgehende Risiko beurteilen und hieraus Schlussfolgerungen für die Notwendigkeit und den Umfang spezieller Prüfungen durch Prüfstellen ableiten kann." (Autorenreferat)

Sozialwissenschaften, Soziologie ; Social sciences, sociology, anthropology ; Arbeitswelt ; Working Conditions ; Arbeitsmittel ; Arbeitssicherheit ; Arbeitsschutz ; Überwachung ; Risikoabschätzung ; Gefahrstoff ; gesetzliche Regelung ; work materials ; on-the-job safety ; occupational safety ; monitoring ; risk assessment ; hazardous material ; statuary regulation

Abschlussbericht, final report

2018-10-25

Based on the fact, that secondary evaluations of sources from social sciences are of high relevance for contemporary historians, it seems to be very productive to refer to the conclusions, that were drawn – and to check them again; to take those primary interpretations, (e.g. the analysis of surveys) as historic sources themselves, potentially including ideological infiltrations or methodological inaccuracies and to compare them with own results. The article presents that procedure by outlining the exemplary project "Youth and leisure time in early FRG" and characterizes, referring to specific questions, the most important surveys of that time.

Geschichte ; History ; Social History, Historical Social Research ; Sozialgeschichte, historische Sozialforschung ; Bundesrepublik Deutschland ; alte Bundesländer ; Jugendforschung ; Forschungsreaktivität ; Befragung ; Jugendlicher ; Sekundäranalyse ; Forschung ; Daten ; research ; secondary analysis ; adolescent ; old federal states ; youth research ; survey ; data ; Federal Republic of Germany ; reactivity effect ; historical ; development of methods ; historisch ; Methodenentwicklung

journal article, Zeitschriftenartikel