ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
You have 0 saved results.
Mark results and click the "Add To Watchlist" link in order to add them to this list.
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    BIOLOGY AND MANAGEMENT OF ECONOMICALLY IMPORTANT LEPIDOPTERAN CEREAL STEM BORERS IN AFRICA (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 47 (2002), S. 701-731 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract Cereals (maize, sorghum, millet, rice) are extremely important crops grown in Africa for human consumption. Of the various insect pests attacking cereal crops in Africa, lepidopteran stem borers are by far the most injurious. All 21 economically important stem borers of cultivated grasses in Africa are indigenous except Chilo partellus, which invaded the continent from India, and C. sacchariphagus, which has recently been found in sugarcane in Mozambique. C. partellus is competitively displacing indigenous stem borers in East and southern Africa. A parasitoid, Cotesia flavipes, was introduced from Pakistan for biological control of C. partellus and caused a 32-55% decrease in stem borer densities. This article is an attempt to summarize the status of knowledge about economically important cereal stem borers in Africa with emphasis on their distribution, pest status and yield losses, diapause, natural enemies, cultural control, host plant resistance, and biological control. Special attention is given to Busseola fusca and C. partellus, the most important pests of maize and grain sorghum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ento.47.091201.145254
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Intercropping increases parasitism of pests (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 631-632 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As part of a programme for controlling lepidopteran stem-borers in cereal crops in Africa, we have investigated the effectiveness of combined cropping regimes of cultivatedand wild plants for reducing stem-borer damage. Intercropping with the non-host molasses grass, Melinis minutiflora, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388631b0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Prediction of Early- and Late-Growth Morphologies of Ionic Crystals (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 384-390 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Comparison of early- and late-growth crystal morphologies of several water-soluble ionic materials suggests that early rapid growth is accompanied by a specific type of morphological distortion. This distortion, involving a change in the relative growth rate of just one growth direction, is consistent with our previously proposed mechanism for the transition from normal, polyhedral crystal growth to dendritic growth. Interpretation of this morphological distortion was aided by morphology prediction methods based on computed attachment energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768198002614
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Modulation of phototactic behavior of first-instar larvae of rice leaffolder by plant factors (1991)
    Springer
    Entomologia experimentalis et applicata 58 (1991), S. 149-157 
    Details
    ISSN: 1570-7458
    Keywords: Rice leaffolder ; Cnaphalocrocis medinalis ; orientation ; movement ; phototaxis ; plant factors ; rice volatiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Au laboratoire et en plein champ, avec la lumière venant d'en haut, les larves du premier stade de la pyrale du riz C. medinalis s'orientent vers le bars lorsqu'elles se trouvent sur une feuille de riz tenue verticale, et elles s'orientent vers le haut lorsqu'elles sont sur du papier filtre. La direction d'orientation sur les deux substrat s'inverse lorsque la lumière provient du bas. Ces différences d'orientation par rapport à la source de lumière, sur la feuille de riz et sur le papier filtre, se maintiennent même lorsque le substrat est horizontal. Lorsque l'expérience est effectuée dans l'obscurité, l'intensité de la réaction d'orientation vers le haut sur du papier filtre tenu verticalement se réduit, et l'orientation vers le bas sur la feuille de riz disparaît. Sur des substrats horizontaux (feuille de riz et papier filtre), les larves ne s'orientent pas dans l'obscurité. On n'observe pas de différence dans le comportement d'orientation entre des larves issues d'œufs pondus sur des plants de riz ou sur des substrats non végétaux, ou entre des larves exposées aux substances volatiles du riz ou à de l'air pur. Le comportement d'orientation des larves du premier stade sur des variétés de riz susceptibles ou résistantes est similaire, mais sur des graminées non-hôtes on n'observe pas d'orientation significative vers le haut ou vers le bas. En traitant les feuilles de riz avec de l'hexane pour enlever les cires de surface, on réduit l'intensité de la réaction d'orientation; cependant, l'application de cires de surface sur du papier filtre ne modifie pas significativement le comportement des larves. Sur une feuille de riz séchée, l'orientation est similaire à celle observée sur papier filtre, mais est d'une intensité plus faible. Les substances volatiles du riz extraites par distillation à la vapeur et appliquées sur une feuille de riz séchée causent une perte d'orientation à 500 pm, tandis que leur application sur du papier filtre cause une décroissance dose-dépendante de l'intensité de l'orientation vers le haut. Ces résultats indiquent que les larves du premier stade de C. medinalis sont positivement phototactiques et que des substance volatiles et d'autres substances jusqu'ici non identifiées et présentes dans les plants de riz causent une inversion ans la phototaxie, ce qui résulte en une orientation vers le bas sur les feuilles de riz.
    Notes: Abstract First-instar larvae of the rice leaffolder Cnaphalocrocis medinalis (Guenńe) oriented upwards on a vertically inclined filter paper and downwards on a rice leaf when the light source was from above. The direction of orientation was reversed when the light source was from below. The opposite directions of orientation on these substrates persisted when the substrates were held horizontal with light source from the sides. No difference was observed in the magnitude of reaction on susceptible and resistant rice varieties or when the rice leaf was held with its distal end pointing down. On non-host grasses, however, the directional orientation was lost. Dipping rice leaves in hexane decreased the magnitude of reaction. On dried rice leaf, the reaction was similar to that on filter paper but was of a lower magnitude. Application of rice plant volatile extracts on a filter paper decreased the intensity of upward orientation while 500 ppm of the volatile extracts applied on dried leaf caused a loss of oriented movement. Application of a mixture of seven volatile chemicals, identified from rice, decreased the magnitude of reaction significantly. It is concluded that rice plant volatiles along with some other hitherto unidentified rice plant factor cause a reversal of phototaxis, leading to downward orientation on the rice leaf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00164939
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Feeding site selection of first-instar larvae of Cnaphalocrocis medinalis on susceptible and resistant rice plants (1991)
    Springer
    Entomologia experimentalis et applicata 60 (1991), S. 43-49 
    Details
    ISSN: 1570-7458
    Keywords: Rice leaffolder ; neonate larval ; feeding site ; movement ; whorl leaf ; mature leaf ; resistance ; varieties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract More first-instar larvae of the rice leaffolder, Cnaphalocrocis medinalis (Guenée), were recovered from susceptible IR36 and Roxoro rice varieties than resistant TKM6 and Oryza perennis, 24 h after infestation. Within a rice plant, a higher proportion of larvae was recovered from young whorl leaf, followed by mature leaves and leafsheaths on all the four rice varieties tested. However, differences were observed between susceptible and resistant varieties in the distribution of larvae on these three plant parts. In laboratory choice tests, first-instar larvae preferred to settle on the young leaves of IR36 and TKM6 when presented with their respective mature leaves. No such preference was observed in tests with Rexoro and O. perennis. Larval survival was similar on young and mature leaves of Rexoro. Young leaves of IR36 and TKM6 were more suitable for survival in comparison with their respective mature leaves while the reverse was true for O. perennis. Larval movement was slower on the mature leaves and larvae took longer to reach the whorl leaf of TKM6 than on IR36. The density of trichomes of the abaxial surface of TKM6 was higher than that of the other varieties tested. Adaptive significance of feeding in the leafwhorl to young larvae is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00164958
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Epididymal histoplasmosis diagnosed by isolation ofHistoplasma capsulatum from semen (1995)
    Springer
    Mycopathologia 131 (1995), S. 173-177 
    Details
    ISSN: 1573-0832
    Keywords: Amphotericin B ; Epididymal histoplasmosis ; Histoplasma capsulatum ; Semen culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An autochthonous case of epididymal histoplasmosis masquerading as tuberculosis in a 55-year-old male patient is reported from India. It was diagnosed by culture ofHistoplasma capsulatum from semen and by demonstration of the fungus upon re-examination of epididymal biopsy sections previously misinterpreted as tuberculous granuloma. The patient's main complaints were painful epididymal swelling, occasional fever and cough. He was treated successfully by excision of epididymis and vas deferens combined with amphotericin B therapy. This is believed to be the first case of epididymal histoplasmosis to be reported outside the American continent and the fourth of its type reported in the English literature. The case is also noteworthy in thatH. capsulatum was isolated for the first time from semen, and it underlines the importance of mycological culture of semen specimens for diagnosis of genitourinary infections of obscure etiology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01102897
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Nickel Bistrifluorostannate(II) Hexahydrate, [Ni(H2O)6](SnF3)2 (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 345-346 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194011340
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Olfactory sensitivity of two sympatric species of rice leaf folders (Lepidoptera: Pyralidae) to plant volatiles (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 2647-2666 
    Details
    ISSN: 1573-1561
    Keywords: Cnaphalocrocis medinalis ; electroantennogram ; green leaf volatiles ; host-plant resistance ; Lepidoptera ; Marasmia patnalis ; olfaction ; plant volatiles ; Pyralidae ; rice leaf folder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electroantennograms (EAGs) were recorded from male and female moths of two sympatric leaf folder species,Cnaphalocrocis medinalis (Gue-née) andMarasmia patnalis Bradley (Lepidoptera: Pyralidae) to 91 volatile chemicals of plant origin. Responses of both leaf folder species were similar to all compounds except to three monoterpenes-β-myrcene, menthone, and isomenthone- and two sesquiterpenes-cis-nerolidol and isophytol. Response ofM. patnalis, an oligophagous leaf folder, to these compounds was higher compared with that of polyphagousC. medinalis. EAG responses of males to saturated and unsaturated aliphatic aldehydes were significantly higher than those of conspecific females in both species. A higher response ofC. medinalis males also was observed for 1-nonanol, 3-nonen-2-one, andtrans, trans-2,6-dimethyl-2,4,6-octatriene. In contrast, females of both species responded more to monoterpenes, borneol, isoborneol, and fenchyl alchohol. Response ofC. medinalis female was higher for terpinen-4-ol, carveol, dihydrocarveol, (−)-myrtenal, and perillaldehyde. In both species and sexes, high EAG responses were recorded for compounds of the green leaf odor complex. EAG responses to nonanal and hexanal were maximum among the aliphatic aldehydes while 1-hexanol elicited the highest response among the alcohols tested. EAG responses to terpene compounds-citronellal,α-terpineol, and (−)-myrtenal-were equal to the response to 1-hexanol. While all compounds tested elicited a negative potential, thymol and carvacrol elicited a positive EAG potential. The EAG data are discussed with regard
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988076
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Mechanisms of resistance in wild riceOryza brachyantha to rice leaffolderCnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae) (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 41-65 
    Details
    ISSN: 1573-1561
    Keywords: Wild rice ; Oryza brachyantha ; rice ; Oryza sativa ; host plant ; resistance ; antixenosis ; attractants ; deterrents ; silica ; rice leaffolder ; Cnaphalocrocis medinalis ; Lepidoptera Pyralidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A wild rice,Oryza brachyantha, was rated as highly resistant to rice leaffolder,Cnaphalocrocis medinalis (Guenée), while its F1 hybrid from a cross with a high-yielding, leaffolder-susceptible rice, IR31917-45-3-2, was rated resistant in a standard screening test. In comparison with IR31917-45-3-2,O. brachyantha and the F1 hybrid were unsuitable for oviposition, survival, and growth ofC. medinalis. However, growth and survival of larvae in artificial diets containing lyophilized leaf powder of IR31917-45-3-2 andO. brachyantha were comparable. Studies on the feeding and settling preference of the larval stages suggested that the mechanism of resistance ofO. brachyantha is that of antixenosis type. Olfactometer tests with first-instar larvae and electroantennogram responses of adults indicated a lack or low levels of volatile attractants inO. brachyantha and the F1 hybrid in comparison with IR31917-45-3-2. Bioassays of sequential solvent extracts of these plants indicated that larval preference for IR31917-45-3-2 and nonpreference forO. brachyantha and the F1 hybrid were due partly to chemical factors present in hexane and methylene chloride extractables. Closer arrangement of silica cells in the epidermal layer ofO. brachyantha and a higher mandibular wear in larvae reared onO. brachyantha suggested that physical resistance due to silica may be an additional cause of resistance. It was hypothesized that the high levels of resistance observed inO. brachyantha may be due to an additive or synergistic action of the absence of attractants or feeding stimulants, the presence of deterrents, and the physical resistance offered by silica. The significance of these results to a successful wide hybridization program aimed at transferring resistance factors from wild rice to cultivated rice is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994421
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Thermophilic actinomycetes in cane sugar mills: an aeromicrobiologic and seroepidemiologic study (1995)
    Springer
    Antonie van Leeuwenhoek 67 (1995), S. 339-344 
    Details
    ISSN: 1572-9699
    Keywords: thermophilic actinomycetes ; aerial prevalence ; bagassosis ; cane sugar mills ; T. sacchari ; precipitins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aerial prevalence of clinically important thermophilic actinomycetes and occurrence of precipitating antibodies against them in sera of 153 exposed workers have been reported. The study was carried out in two cane sugar mills namely, the Upper Doab Sugar Mills and the Ramala Sugar Mills, located in north-west India. In both the sugar mills,T. sacchari was the predominant species, it accounted for 55.1% and 50.3% of the total population of thermophilic actinomycetes, followed byT. vulgaris (19.7% and 23.7%),T. thalpophilus (21.1% and 17.1%),Saccharomonospora viridis (3.4% and 5.0%) andSaccharopolyspora rectivirgula (Faenia rectivirgula) (0.7% and 3.9%), respectively. Precipitating antibodies against thermophilic actinomycetes were demonstrable in 34 (22.2%) workers;T. sacchari alone accounted for 20 of the positive precipitin reactions, followed byS. rectivirgula in 10. The mean absorbance values for IgG antibody activity againstT. sacchari as well asS. rectivirgula were found to be elevated significantly in the symptomatic workers than in the asymptomatic workers (p〈0.05) or unexposed controls (p〈0.001). However, the difference in IgG antibody activity was insignificant between precipitin-positive symptomatic workers and precipitin-positive asymptomatic workers. The results indicate that clinically important thermophilic actinomycetes are widely prevalent in cane sugar mills, andT. sacchari andS. rectivirgula are the major species involved in the sensitization of the bagasse workers in India.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00872932
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...