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  • 1
    Electronic Resource
    Electronic Resource
    Insecticide Synergists, Colorimetric Determination of Small Quantities of Methylenedioxyphenyl-Containing Pyrethrum Synergists (1955)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 3 (1955), S. 122-124 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60048a001
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Behavioral responses to an alkylpyrazine from the mandibular gland of the antWasmannia auropunctata (1982)
    Springer
    Insectes sociaux 29 (1982), S. 369-374 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die mandibularen Drüsen der AmeiseWasmannia auropunctata enthalten 2,5-dimethyl-3-isopentylpyrazin, eine Verbindung mit der andere gleich-artige Nestbewohner von gestorten Arbeitern herbeigelockt werden. Während einer aggressiven interspezifischen Begegnung kann die kleine Ameise das Alkylpyrazin als ein Abstossungsmittel benutzen und ihren Opponenten noch dazu mit ihrem wirkungsvollen giftigen Stich untauglich machen. Alkylpyrazine sind schon früher in Vertreten der Unterfamilien Ponerinæ, Formicinæ und Dolichoderinæ gefunden worden, jedoch ist dies der erste Bericht über Alkylpyrazine in den mandibularen Drüsen einer Art der Myrmicinæ.
    Notes: Summary Mandibular glands of the ant,Wasmannia auropunctata, contain 2,5-dimethyl-3-isopentylpyrazine, a compound which attracts nestmates to disturbed workers. During interspecific aggressive encounters, this small ant may utilize the alkylpyrazine as a repellent as well as disabling opponents with its potent sting venom. Alkylpyrazines have been previously identified as cephalic products from ants of the subfamilies Ponerinæ, Formicinæ, and Dolichoderinæ but this is the first report of an alkylpyrazine from the mandibular glands of a member of the Myrmicinæ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02228764
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  • 3
    Electronic Resource
    Electronic Resource
    Some factors influencing dealation by virgin queen fire ants (1983)
    Springer
    Insectes sociaux 30 (1983), S. 443-454 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Lorsque des reines vierges de la fourmi de feu sont soustraites à l'influence de la phéromone inhibitrice produite par la reine, elles perdent leurs ailes plus facilement en présence d'ouvrières qu'en leur absence. Lorsqu'elles sont isolées pendant 72 heures après la levée de l'inhibition, un nombre significativement plus grand de reines vierges ayant hiverné perdent leurs ailes, par rapport aux reines vierges élevées au printemps. Toutefois, les nombres d'individus perdant leurs ailes en présence d'ouvrières sont similaires. Après désinhibition, quelques reines vierges immatures perdent leurs ailes. Les sexués vierges désailés sont capables de prévenir la perte des ailes chez d'autres sexués vierges. Les divers facteurs influençant la déalation chez les reines vierges ont été utilisés afin de développer un essai biologique pour la phéromone inhibitrice produite par la reine deS. invicta.
    Notes: Summary Virgin queens of the fire ant,Solenopsis invicta Buren, that were removed from the influence of the inhibitory queen pheromone, dealated more readily in the presence of workers than in their absence. During 72 hours after disinhibition, a significantly greater number of overwintered virgin queens than spring-reared virgin queens dealated when they were isolated, but the numbers that dealated in the presence of workers were very similar. Some sexually immature virgin queens dealated after disinhibition. Virgin dealates were found to be capable of preventing other virgin queens from dealating. The various factors that influence dealation by virgin queens were used to develop a bioassay for the inhibitory queen pheromone ofS. invicta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223975
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  • 4
    Electronic Resource
    Electronic Resource
    Laboratory investigations of the trail-following responses of four species of leaf-cutting ants with notes on the specificity of a trail pheromone ofAtta texana (Buckley) (1974)
    Springer
    Insectes sociaux 21 (1974), S. 87-94 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Nous avons étudié comment quatre espèces de FourmisAtta suivent mutuellement les pistes tracées avec le contenu de leur sac à venin. Toutes les espèces étudiées ont suivi les pistes des autres à une seule exception. Cependant, lorsque nous avons donné aux Fourmis le choix entre deux pistes distinctes, nous avons montré qu'il y avait des différences dans le contenu du sac à venin de trois espèces. Nous avons étudié les réponses de 24 espèces de Fourmis et d'une espèce de Termite à une phéromone de piste deAtta texana (Buckley).
    Notes: Summary Interspecific trail following activity of poison sac contents from four species of leaf-cutting ants was investigated. With only one exception, all the species tested followed trails made from each others poison sac contents. However when the ants were given a choice of following one of two separate trails, clear differences were shown in the poison sac contents of the three species tested. The responses of 24 species of ants and one species of termite to anAtta texana (Buckley) trail pheromone were tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02222981
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  • 5
    Electronic Resource
    Electronic Resource
    o-Aminoacetophenone, a pheromone that repels honeybees (Apis mellifera L.) (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 270-271 
    Details
    ISSN: 1420-9071
    Keywords: Pheromone ; social behavior ; honeybee
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary o-Aminoacetophenone is a pheromone produced by virgin honeybee queens and released with feces. In small social groups, the pheromone repels and is used to terminate agonistic interactions between queens and workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941735
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  • 6
    Electronic Resource
    Electronic Resource
    Nitric oxide in ischaemic acute renal failure of streptozotocin diabetic rats (1996)
    Springer
    Diabetologia 39 (1996), S. 1036-1040 
    Details
    ISSN: 1432-0428
    Keywords: Keywords Nitric oxide ; nitrite ; nitrate ; l-arginine ; N-omega-nitro-l-arginine ; ischaemic acute renal failure ; diabetes mellitus ; streptozotocin ; rats.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Changes in nitric oxide (NO) levels were determined in ischaemic acute renal failure in streptozotocin-induced diabetes mellitus rats. Two weeks after streptozotocin administration and immediately after right nephrectomy, the left renal artery was occluded for 60 min. Similar procedures were carried out in non-diabetic rats. The nitrite (NO2) + nitrate (NO3) levels were measured in plasma and urine. The effects of chronic oral supplementation with l-arginine and an NO synthase inhibitor (N-omega-nitro-l-arginine) were also studied in both diabetic and non-diabetic rats before and after renal artery clamping. The rats with diabetic acute renal failure had a much lower creatinine clearance (90 ± 22 μl · min−1· 100 g body weight −1, p 〈 0.005), and higher fractional excretion of sodium (FENa)% (10.90 ± 4.2, p 〈 0.001) and protein excretion (2078 ± 69 μg/ml creatinine clearance, p 〈 0.001) compared with the respective values in the non-diabetic groups (163 ± 30; 1.46 ± 86; 453.3 ± 31). The plasma and urine NO2 + NO3 levels were significantly higher in the untreated diabetic rats compared with the untreated normal rats before ischaemia (p 〈 0.001). The ischaemic acute renal failure in non-diabetic rats increased the plasma and urinary NO2 + NO3 excretion after ischaemia. The urinary excretion of these metabolites decreased significantly and their plasma levels remained unchanged in the ischaemic diabetic rats. The l-arginine administration resulted in a small but significantly higher creatinine clearance after clamping in the non-diabetic rats. The NO synthase inhibitor caused deterioration in renal function in all ischaemic and non-ischaemic groups. In summary, the greater vulnerability to ischaemia of the diabetic kidney seems to be associated with both impaired response to and impaired production of NO. [Diabetologia (1996) 39: 1036–1040]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400651
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  • 7
    Electronic Resource
    Electronic Resource
    Nitric oxide in ischaemic acute renal failure of streptozotocin diabetic rats (1996)
    Springer
    Diabetologia 39 (1996), S. 1036-1040 
    Details
    ISSN: 1432-0428
    Keywords: Nitric oxide ; nitrite ; nitrate ; l-arginine ; N-omega-nitro-l-arginine ; ischaemic acute renal failure ; diabetes mellitus ; streptozotocin ; rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Changes in nitric oxide (NO) levels were determined in ischaemic acute renal failure in streptozotocin-induced diabetes mellitus rats. Two weeks after streptozotocin administration and immediately after right nephrectomy, the left renal artery was occluded for 60 min. Similar procedures were carried out in non-diabetic rats. The nitrite (NO2) + nitrate (NO3) levels were measured in plasma and urine. The effects of chronic oral supplementation with l-arginine and an NO synthase inhibitor (N-omega-nitro-l-arginine) were also studied in both diabetic and non-diabetic rats before and after renal artery clamping. The rats with diabetic acute renal failure had a much lower creatinine clearance (90±22 Μl · min−1 · 100 g body weight−1, p〈0.005), and higher fractional excretion of sodium (FENa)% (10.90±4.2, p〈0.001) and protein excretion (2078±69 Μg/ml creatinine clearance, p〈0.001) compared with the respective values in the non-diabetic groups (163±30; 1.46±86; 453.3±31). The plasma and urine NO2 + NO3 levels were significantly higher in the untreated diabetic rats compared with the untreated normal rats before ischaemia (p〈0.001). The ischaemic acute renal failure in non-diabetic rats increased the plasma and urinary NO2 + NO3 excretion after ischaemia. The urinary excretion of these metabolites decreased significantly and their plasma levels remained unchanged in the ischaemic diabetic rats. The l-arginine administration resulted in a small but significantly higher creatinine clearance after clamping in the non-diabetic rats. The NO synthase inhibitor caused deterioration in renal function in all ischaemic and non-ischaemic groups. In summary, the greater vulnerability to ischaemia of the diabetic kidney seems to be associated with both impaired response to and impaired production of NO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400651
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Checking the correctness of memories (1994)
    Springer
    Algorithmica 12 (1994), S. 225-244 
    Details
    ISSN: 1432-0541
    Keywords: Program checking ; Hashing ; Stack ; Queue ; RAM ; Data structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We extend the notion of program checking to include programs which alter their environment. In particular, we consider programs which store and retrieve data from memory. The model we consider allows the checker a small amount of reliable memory. The checker is presented with a sequence of requests (on-line) to a data structure which must reside in a large but unreliable memory. We view the data structure as being controlled by an adversary. We want the checker to perform each operation in the input sequence using its reliable memory and the unreliable data structure so that any error in the operation of the structure will be detected by the checker with high probability. We present checkers for various data structures. We prove lower bounds of logn on the amount of reliable memory needed by these checkers wheren is the size of the structure. The lower bounds are information theoretic and apply under various assumptions. We also show time-space tradeoffs for checking random access memories as a generalization of those for coherent functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185212
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  • 9
    Electronic Resource
    Electronic Resource
    o-Aminoacetophenone: Identification in a primitive fungus-growing ant (Mycocepurus goeldii) (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 816-817 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary o-Aminoacetophenone is the major volatile product present in the mandibular gland secretion of the primitive fungus-growing antMycocepurus goeldii. This novel arthropod natural product is biosynthetically far removed from the aliphatic ketones and alcohols found in those genera of the tribe Attini that represent the main line of evolution. The divergent phylogenetic position ofMycocepurus, and possibly of other closely related genera, is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01985656
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of bupropion, a novel antidepressant agent, following oral administration to healthy subjects (1981)
    Springer
    European journal of clinical pharmacology 21 (1981), S. 127-135 
    Details
    ISSN: 1432-1041
    Keywords: antidepressant ; bupropion ; pharmacokinetics ; oral administration ; radioimmunoassay ; urinary excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of bupropion hydrochloride, a structurally novel antidepressant agent, have been studied in healthy male and female subjects following administration of single oral doses of 50, 100 and 200 mg. Plasma drug concentrations were determined directly by a specific radioimmunoassay (r. i. a.), while urinary measurements required a prior solvent extraction to remove substances interfering in the assay. Bupropion appeared rapidly in the plasma, suggesting good absorption. Drug plasma concentration-time data were fitted well to a two-compartment open model of drug disposition by use of the computer program NONLIN. By comparison of AUC, Cmax and tmax values, the pharmacokinetics of bupropion were found to be linear across the 50–200 mg dose range in both sexes. When the data were normalized for subjects' body weights, no differences between pharmacokinetic parameters for male and female subjects were found. Mean disposition half-lives across treatments were 1.2–1.4 h for t1 2α and 10.7–13.8 h for the t1 2β. Bupropion was extensively bound (85%) to human plasma proteins over a wide drug concentration range. Less than 1% of a 200 mg oral dose of bupropion hydrochloride appeared in the urine of 16 subjects as unchanged drug, indicating extensive metabolism of the parent compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637513
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