226,385 research outputs found
BERNI M JANSSEN BOOK LAUNCH SPINIFEX PRESS
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/66575Digital audio recording of Berni M Janssen, Australian text artist reading of her work at the launch of new book of poetry, 'Between Wind & Water (In a Vulnerable Place)'. The launch was held on 5 October 2018 at the Collected Works Book Shop Melbourne and the publishers of the work were Spinifex Press284058
Acquisition: [2019.0001] "BERNI M JANSSEN BOOK LAUNCH SPINIFEX PRESS
Selecting films for sex research: Gender differences in erotic film preference
No full textThe official published version can be obtained from the link below.The aim of this study was to explore gender differences in sexual responsiveness to erotic films that had been selected for their differential appeal for men and women. A secondary objective was to identify variables that influence sexual arousal and explore whether these variables differ for men and women. Fifteen men (M age = 26 yrs) and 17 women (M age = 24 yrs) were presented with 20 film clips depicting heterosexual interactions, half of which were female- and the other half male-selected, and were asked to rate the clips on a number of dimensions. Overall, men found the film clips more sexually arousing than did the women. Gender differences in arousal were negligible for female-selected clips but substantial for male-selected clips. Furthermore, men and women experienced higher levels of sexual arousal to clips selected for individuals of their own gender. Cluster regression analyses, explaining 77% of the variance for male and 65% for female participants, revealed that men's sexual arousal was dependent upon the attractiveness of the female actor, feeling interested, and both imagining oneself as a participant and watching as an observer. For women, with all variables entered, only imagining oneself as a participant contributed to sexual arousal ratings. The findings suggest that how films are selected in sex research is an important variable in predicting levels of sexual arousal reported by men and women
Discours prononcé par M. Janssen, membre de l’Académie des Sciences, au nom de cette Académie, aux obsèques de Félix Tisserand
No full textJanssen . Discours prononcé par M. Janssen, membre de l’Académie des Sciences, au nom de cette Académie, aux obsèques de Félix Tisserand. In: Bulletin astronomique, tome 13, 1896. pp. 422-425
Down Souf in Alabama / words by B.H. Janssen
No full textCover: drawing of a well-dressed African American male dancing along by himself; Publisher: M. D. Janssen and Co. (New York)https://egrove.olemiss.edu/sharris_a/1037/thumbnail.jp
Janssen, Richard M. -- 1967 -- Correspondence, Individual -- letter, 1967-06-27
No full textLetter from Jamison, Richard M. to Sabin, Albert B. dated 1967-06-27.Sabin Collection Fair Use Policy</a
E. M. Janssen, Jacob Burckhardt und die Griechen
No full textVerdin Herman. E. M. Janssen, Jacob Burckhardt und die Griechen. In: L'antiquité classique, Tome 52, 1983. pp. 626-628
Resistance to root-knot nematodes, Meloidogyne spp., in potato
No full textRoot-knot nematodes, Meloidogyne spp., are world-wide one of the most damaging pests to arable farming. In North Western Europe, the species M. chitwoodi, M. fallax and M. hapla are becoming a serious problem in potato growing areas as a result of recent changes in crop rotation, that now include highly profitable host crops, and a reduced use of nematicides in potato. The root-knot nematodes can cause yield reduction and deteriorate the quality of the tuber to an unmarketable product. Since root-knot nematodes can multiply inside the tuber, infected potato tubers are a threat to infest Meloidogyne-free fields. To prevent this way of dispersal, quarantine measures will be in force for seed tubers in the countries of the European Community from August 1997.Plant resistance is an effective, economical and environmentally safe alternative to control root-knot nematodes, but resistance is lacking in the presently used potato cultivars. The goal of the research described in this thesis was to identify and evaluate sources of resistance to M. chitwoodi, M. fallax and M. hapla and, if present, to initiate the transfer of resistance into cultivated potato.A large screening of wild Solanum spp. was performed to identify sources of resistance to M. chitwoodi, M. fallax and/or M. hapla by selecting seedlings, which showed no to hardly any reproduction of the nematodes on the roots. High levels of resistance to both M. chitwoodi and M. fallax were observed in genotypes of S. bulbocastanum, S. cardiophyllum, S. brachistotrichum, S. fendleri and S. hougasii, whereas additionally moderate resistance to M. fallax was present in S. stoloniferum and S. chacoense and to M. chitwoodi in S. gourlayi. More Solanum species were selected with resistance to M. hapla, namely 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. In general, resistance to M. chitwoodi and M. fallax was restricted to Solanum species originating from Central America, whereas resistance to M. hapla was present in numerous Central- and South American Solanum species. This might indicate that co-evolution has occurred between M. chitwoodi and related M. fallax and Central American Solanum species.The following step was the evaluation of resistance with regard to the effectivity and working spectrum. In a glasshouse, resistant and susceptible Solanum genotypes were tested with two to four populations of M. chitwoodi, M. fallax and M. hapla to determine the level of resistance and to detect the presence of virulent populations within these Meloidogyne species. Resistant genotypes of S. bulbocastanum, S. hougasii, S. cardiophyllum and S. fendleri showed an almost absolute level of resistance and were able to suppress all populations of M. chitwoodi and M. fallax tested. Some genotypes of S. chacoense and S. stoloniferum showed moderate resistance to M. fallax, but not or in a lesser extent to M. chitwoodi. In contrast, large differences in virulence were observed between the four tested populations of M. hapla on resistant genotypes of S. bulbocastanum, S. hougasii, S. chacoense, S. gourlayi, S. sparsipilum and S. spegazzinii. Some genotypes with resistance to M. chitwoodi, M. fallax andlor M. hapla were also tested against isolates of the tropical and subtropical Meloidogyne species M. incognita, M. arenaria and M. javanica, but resistance was not effective to these high temperature adapted species.The effectivity of resistance of some selected wild Solanum species was also evaluated under natural field conditions. In two fields in the Netherlands, naturally infested with M. hapla or M. fallax, the level of infection of soil surrounding resistant and susceptible genotypes was followed during a growing season. From August onwards, large differences in number of second-stage juveniles were present between resistant and susceptible genotypes. At the end of the growing season, the level of infection in soil of resistant wild Solanum genotypes was equal or lower compared to the beginning, whereas soil surrounding susceptible wild and cultivated genotypes showed a 7- to 22-fold increase of nematode infection. The results were comparable with the resistance tests in glasshouse experiments.An important feature for a rapid introgression of resistance is the inheritance and this has been investigated for the resistance to M. chitwoodi and M. fallax in S.fendleri, S. hougasii and S. stoloniferum. Although these Solanum species are polyploid, a disomic genetic behaviour can be expected as earlier indicated by cytogenetic and genetic studies. Various populations were produced from crosses between resistant and susceptible plants, self- pollinations and backcrosses within the wild Solanum species and segregation patterns of progenies in resistant and susceptible plants were analysed. The progeny tests of S. fendleri clearly indicated the action of a single dominantly inherited gene, effective against both M. chitwoodi and M. fallax, and the symbol R mc2 is proposed for this gene. In the case of S. hougasii, difficulties were met in producing backcross populations, but results also indicated the presence of a simple dominant factor for both nematode species. From the results of progeny tests of S. stoloniferum, it was concluded that several additive genes are involved.The introgression of resistance from various wild Central American Solanum species into the cultivated potato has been initiated through interspecific hybridisation. Crosses were made between diploid S. tuberosum and diploid S. bulbocastanum, S. brachistotrichum and S. cardiophyllum, but no plants were obtained from these crosses. From crosses of tetraploid S. tuberosum with tetraploid S. stoloniferum and S. fendleri, and of diploid S. tuberosum with hexaploid S. hougasii few seeds leading to tetraploid hybrids were obtained, sometimes after in vitro culture of immature seeds. The hybrid status was confirmed with RAPD markers and the ploidy level was analysed using flow cytometry. These cross combinations were thought not to be possible according to the Endosperm Balance Number hypothesis and the hybrids obtained are considered to be escapes. Backcrosses were made and a variable number of seeds leading to first backcrossed genotypes (BC 1 's) was produced depending on the hybrid genotype. The introgression of resistance to root-knot nematodes from S.fendleri, S. stoloniferum and S. hougasii has now advanced to the evaluation of resistant BC 1 's for other traits before continuation of further backcrosses.In conclusion, resistance to the root-knot nematodes M. chitwoodi, M. fallax and M. hapla has been identified in various Solanum species and has the potential to become an effective tool to control these pathogens under field conditions after transfer into cultivated potato. The first steps of introgression of resistance into S. tuberosum has been made. The introduction of multiple sources of resistance in new potato cultivars will enable a resistance management based on durable exploitation of useful resistance genes from natural resources
Methodology for updating terrain object data from remote sensing data. The application of Landsat TM data with respect to agricultural fields.
No full textThis thesis describes some methods for updating the thematic and geometrical data of terrain objects that are contained in a Geographic Information System (GIS). The updating is based on the application of digital interpretation techniques on high resolution satellite data. The potential for updating terrain object data from remote sensing (RS) data is largely determined by two factors:(i) The thematic and geometrical characteristics of terrain objects that can be extracted from RS data depend on their relationship with the spectral and spatial information present in the RS data applied.(ii) Furthermore, digital interpretation techniques cannot directly yield the information required due to the complexity of real world images.The idea underlying this thesis is that information extraction from RS data (based on digital interpretation techniques) can be improved and optimized by using ancillary data and knowledge about the static and dynamic properties of the terrain objects of interest. Such an approach requires integrated processing of different types of data and knowledge. Important aspects of an integrated approach are the integration level (pixel-based versus object-based data integration), the spatial aspects (co-registration and vector/raster integration) and error propagation.The terrain objects of interest in this thesis are agricultural fields. A data set was established consisting of a Landsat TM image and (multi-temporal) data on the crop type and field geometry of agricultural fields in a polder area in the Netherlands. Three updating methods by means of an integrated approach were developed and tested with the available data.Knowledge about crop rotations was formalized by means of transition matrices which store transition probabilities. The transition probabilities, corresponding to the crop type grown in the preceding growing season, were used as (conditional) a-priori probabilities in a pixel-based maximum likelihood classification. For the test area, overall classification accuracy increased with 2 % to 17 % depending on the spectral separability and the set of a-priori probabilities applied.Object-based classification was used to determine the crop type of agricultural fields for which the geometry was already contained in a GIS. In the same process the field geometry is used to derive a reliable classification result by excluding boundary pixels which are most often mixed pixels. For 92 % of the fields in the test area a correct crop type was determined.An integrated segmentation and classification method was applied to determine both the field geometry and crop type of agricultural fields. The results of an edge detection on the TM image were integrated with the fixed boundaries contained in the GIS by using knowledge about the aggregation structure and shape of the fields. The resulting field geometry corresponded for 87 % with field geometry derived from visual interpretation of the TM image.Several aspects of data integration were identified. Object-based data integration, which means that knowledge is formulated in terms of terrain objects that have geometrical and thematic properties, is required for updating. A large number of representations are possible for formalizing knowledge; different methods for representation were used in this thesis: transition matrices, statistical functions and geometrical functions.For the integration of the vector-structured terrain object data with the rasterstructured RS data two approaches can be adopted: data conversion (vector-to-raster and vice versa) or 'direct integration'. The last approach was used to identify the raster elements that are located within a polygon in object-based classification.The case studies showed that terrain object data can be updated based on digital interpretation of remote sensing data and that the ancillary data and knowledge are effective for improving and optimizing the information extraction. Nevertheless, the information (type and quality) that can be extracted still largely depends on the (spectral and spatial) relationship between the terrain objects of interest and the RS data applied
Janssen, Richard M. -- 1967 -- Correspondence, Individual -- letter, 1967-06-26
No full textLetter from Sabin, Albert B. to Jamison, Richard M. dated 1967-06-26.Sabin Collection Fair Use Policy</a
Resistance to root-knot nematodes, Meloidogyne spp., in potato
No full textRoot-knot nematodes, Meloidogyne spp., are world-wide one of the most damaging pests to arable farming. In North Western Europe, the species M. chitwoodi, M. fallax and M. hapla are becoming a serious problem in potato growing areas as a result of recent changes in crop rotation, that now include highly profitable host crops, and a reduced use of nematicides in potato. The root-knot nematodes can cause yield reduction and deteriorate the quality of the tuber to an unmarketable product. Since root-knot nematodes can multiply inside the tuber, infected potato tubers are a threat to infest Meloidogyne-free fields. To prevent this way of dispersal, quarantine measures will be in force for seed tubers in the countries of the European Community from August 1997.Plant resistance is an effective, economical and environmentally safe alternative to control root-knot nematodes, but resistance is lacking in the presently used potato cultivars. The goal of the research described in this thesis was to identify and evaluate sources of resistance to M. chitwoodi, M. fallax and M. hapla and, if present, to initiate the transfer of resistance into cultivated potato.A large screening of wild Solanum spp. was performed to identify sources of resistance to M. chitwoodi, M. fallax and/or M. hapla by selecting seedlings, which showed no to hardly any reproduction of the nematodes on the roots. High levels of resistance to both M. chitwoodi and M. fallax were observed in genotypes of S. bulbocastanum, S. cardiophyllum, S. brachistotrichum, S. fendleri and S. hougasii, whereas additionally moderate resistance to M. fallax was present in S. stoloniferum and S. chacoense and to M. chitwoodi in S. gourlayi. More Solanum species were selected with resistance to M. hapla, namely 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. In general, resistance to M. chitwoodi and M. fallax was restricted to Solanum species originating from Central America, whereas resistance to M. hapla was present in numerous Central- and South American Solanum species. This might indicate that co-evolution has occurred between M. chitwoodi and related M. fallax and Central American Solanum species.The following step was the evaluation of resistance with regard to the effectivity and working spectrum. In a glasshouse, resistant and susceptible Solanum genotypes were tested with two to four populations of M. chitwoodi, M. fallax and M. hapla to determine the level of resistance and to detect the presence of virulent populations within these Meloidogyne species. Resistant genotypes of S. bulbocastanum, S. hougasii, S. cardiophyllum and S. fendleri showed an almost absolute level of resistance and were able to suppress all populations of M. chitwoodi and M. fallax tested. Some genotypes of S. chacoense and S. stoloniferum showed moderate resistance to M. fallax, but not or in a lesser extent to M. chitwoodi. In contrast, large differences in virulence were observed between the four tested populations of M. hapla on resistant genotypes of S. bulbocastanum, S. hougasii, S. chacoense, S. gourlayi, S. sparsipilum and S. spegazzinii. Some genotypes with resistance to M. chitwoodi, M. fallax andlor M. hapla were also tested against isolates of the tropical and subtropical Meloidogyne species M. incognita, M. arenaria and M. javanica, but resistance was not effective to these high temperature adapted species.The effectivity of resistance of some selected wild Solanum species was also evaluated under natural field conditions. In two fields in the Netherlands, naturally infested with M. hapla or M. fallax, the level of infection of soil surrounding resistant and susceptible genotypes was followed during a growing season. From August onwards, large differences in number of second-stage juveniles were present between resistant and susceptible genotypes. At the end of the growing season, the level of infection in soil of resistant wild Solanum genotypes was equal or lower compared to the beginning, whereas soil surrounding susceptible wild and cultivated genotypes showed a 7- to 22-fold increase of nematode infection. The results were comparable with the resistance tests in glasshouse experiments.An important feature for a rapid introgression of resistance is the inheritance and this has been investigated for the resistance to M. chitwoodi and M. fallax in S.fendleri, S. hougasii and S. stoloniferum. Although these Solanum species are polyploid, a disomic genetic behaviour can be expected as earlier indicated by cytogenetic and genetic studies. Various populations were produced from crosses between resistant and susceptible plants, self- pollinations and backcrosses within the wild Solanum species and segregation patterns of progenies in resistant and susceptible plants were analysed. The progeny tests of S. fendleri clearly indicated the action of a single dominantly inherited gene, effective against both M. chitwoodi and M. fallax, and the symbol R mc2 is proposed for this gene. In the case of S. hougasii, difficulties were met in producing backcross populations, but results also indicated the presence of a simple dominant factor for both nematode species. From the results of progeny tests of S. stoloniferum, it was concluded that several additive genes are involved.The introgression of resistance from various wild Central American Solanum species into the cultivated potato has been initiated through interspecific hybridisation. Crosses were made between diploid S. tuberosum and diploid S. bulbocastanum, S. brachistotrichum and S. cardiophyllum, but no plants were obtained from these crosses. From crosses of tetraploid S. tuberosum with tetraploid S. stoloniferum and S. fendleri, and of diploid S. tuberosum with hexaploid S. hougasii few seeds leading to tetraploid hybrids were obtained, sometimes after in vitro culture of immature seeds. The hybrid status was confirmed with RAPD markers and the ploidy level was analysed using flow cytometry. These cross combinations were thought not to be possible according to the Endosperm Balance Number hypothesis and the hybrids obtained are considered to be escapes. Backcrosses were made and a variable number of seeds leading to first backcrossed genotypes (BC 1 's) was produced depending on the hybrid genotype. The introgression of resistance to root-knot nematodes from S.fendleri, S. stoloniferum and S. hougasii has now advanced to the evaluation of resistant BC 1 's for other traits before continuation of further backcrosses.In conclusion, resistance to the root-knot nematodes M. chitwoodi, M. fallax and M. hapla has been identified in various Solanum species and has the potential to become an effective tool to control these pathogens under field conditions after transfer into cultivated potato. The first steps of introgression of resistance into S. tuberosum has been made. The introduction of multiple sources of resistance in new potato cultivars will enable a resistance management based on durable exploitation of useful resistance genes from natural resources
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