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    Publication Date: 2021-05-19
    Description: La investigación tuvo como objetivo recopilar, analizar y correlacionar los parámetros y variables provenientes de los registros de la aplicación del PSMB, así como de otras fuentes de información, con el fin de conocer la evolución de los eventos de Floraciones de Algas Nocivas y poder identificarlas y proponer macrozonas que se caractericen por la ocurrencia de determinados FANs o plagas hidrobiológicas.
    Description: The research aimed to collect, analyze and correlate the parameters and variables from the records of the application of PSMB, as well as other sources of information, in order to know the evolution of events and Harmful Algal Blooms to identify and propose macrozones that are characterized by certain HABs idea hidrobiológicas or pests.
    Description: Published
    Keywords: Algal blooms ; Benthic environment
    Repository Name: AquaDocs
    Type: Report , Non Refereed
    Format: 176pp. & Anexos
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 14 (1966), S. 268-270 
    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
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 14 (1966), S. 266-268 
    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
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 34 (1962), S. 276-278 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 72 (1989), S. 183-194 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The calibration of impulse voltage measuring systems is based on a system identification by unit-step response measurements. Regarding extended measuring systems, step-response distortions result from radiative coupling between the divider column and the measuring circuit. This paper describes a three dimensional field calculation method, allowing the modeling of high-voltage measuring circuits. Unlike the method of moments, geometrical theory of diffraction and hybride technique, the described method is based on the time domain model of the Transient Elementary Dipole TED. The paper demonstrates the calculation of the electromagnetic field in step-response measuring circuits, and the simulation of step-response measurements considering transient radiation effects.
    Notes: Übersicht In der Hochspannungsmeßtechnik treten bei der Sprungantwortmessung von räumlich ausgedehnten Spannungsteilern Signalverzerrungen auf, die von der elektromagnetischen Kopplung der Teilersäule mit der Zuleitung und dem Impulsgenerator herrühren. Nach einer kurzen Übersicht über bestehende Verfahren zur Berechnung transienter elektromagnetischer Felder wird ein dreidimensionales Zeitbereichsmodell zur Nachbildung von Meßkreisen der Hochspannungstechnik vorgestellt, der Transiente Elementar Dipol TED. Als Anwendungsbeispiele werden die Berechnung des elektromagnetischen Feldes in Sprungantwortmeßkreisen, sowie die Simulation von Sprungantwortmessungen unter Berücksichtigung des transienten Strahlungsfeldes vorgestellt.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 140 (1984), S. 243-246 
    ISSN: 1432-072X
    Keywords: Nitrogenase ; Hydrogenase ; Rhizobium japonicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The conditions necessary for coordinate derepression of nitrogenase and O2-dependent hydrogenase activities in free-living cultures of Rhizobium japonicum were studied. Carbon sources were screened for their ability to support nitrogenase, and then hydrogenase activities. There was a positive correlation between the level of nitrogenase and corresponding hydrogenase activities among the various carbon substrates. The carbon substrate α-ketoglutarate was able to support the highest levels of both nitrogenase and hydrogenase activities. When cells were incubated in α-ketoglutarate-containing medium, without added H2 but in the presence of acetylene (to block H2 evolution from nitrogenase) significant hydrogenase activity was still observed. Complete inhibition of nitrogenase-dependent H2 evolution by acetylene was verified by the use of a Hup- mutant. Hydrogen is therefore not required to induce hydrogenase. The presence of 10% acetylene inhibited derepression of hydrogenase. Constitutive (Hupc) mutants were isolated which contained up to 9 times the level of hydrogenase acitivity than the wild type in nitrogenase induction medium. These mutants did not have greater nitrogenase activities than the wild type.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 146 (1986), S. 280-283 
    ISSN: 1432-072X
    Keywords: Bradyrhizobium ; Nickel ; Hydrogenase ; Regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The addition of 5 μM nickel to heterotropically growing hydrogen uptake constitutive mutants resulted in up to a 10-fold increase in hydrogen uptake activity. Strain SR wild type cells required nickel for the derepression of hydrogenase in media treated to remove contaminating nickel and produced increasing levels of hydrogenase activity as a function of increasing nickel concentration. Immunoblots of SR wild type cultures derepressed with various concentrations of nickel revealed that the amount of anti-hydrogenase cross-reactive material synthesized is dependent on the amount of nickel in the media. Studies using chloramphenicol demonstrated that protein synthesis, in addition to nickel, was required for the synthesis of hydrogenase; inactive (nickel-free) hydrogenase protein does not accumulate during derepression in the absence of nickel. Thus the acquisition of hydrogenase activity by adding nickel during the course of derepression is not the result of nickel being inserted into pre-formed hydrogenase. Rifampicin inhibition studies suggested that nickel is required for the transcription of hydrogenase related genes. It is proposed that nickel, in addition to its structural role in the enzyme, plays a role in the regulation of hydrogenase expression in Bradyrhizobium japonicum.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 55 (1999), S. 111-115 
    ISSN: 1432-1041
    Keywords: Key words Stereoselectivity ; Chirality ; Melatonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: Melatonin is a mediator in the establishment of the circadian rhythm of biological processes. It is produced in the pineal gland mainly during the night by stimulation of adrenergic beta1- and alpha1-receptors. Sleep disturbances are common side-effects of beta-blockers. The influence of specific beta-blockade as well as that of combined alpha-and beta-blockade on melatonin production has not been investigated in humans before. Methods: We performed a randomized, double-blind, placebo-controlled, cross-over study in 15 healthy volunteers. Subjects received single oral doses of 40 mg (R)-propranolol, 40 mg (S)-propranolol, 50 mg (R)-atenolol, 50 mg (S)-atenolol, 25 mg (R,S)-carvedilol, 120 mg (R,S)-verapamil or placebo at 1800 hours. Urine was collected between 2200 hours and 0600 hours, and 6-sulfatoxy-melatonin (aMT6s), the main metabolite of melatonin which is almost completely eliminated in urine, was determined by radioimmunoassay (RIA). Results: Mean nocturnal excretion of aMT6s in urine after intake of the drugs was as follows (in μg): placebo 26; (R)-propranolol 24 (−7%, NS); (S)-propranolol 5 (−80%, P 〈 0.001); (R)-atenolol 27 (+7%, NS); (S)-atenolol 4 (−86%, P 〈 0.01); (R,S)-carvedilol 23 (−10%, NS); (R,S)-verapamil 29 (+14%, NS). These data show that only the specifically beta-blocking (S)-enantiomers of propranolol and atenolol decrease the nocturnal production of melatonin whereas the non-beta-blocking (R)-enantiomers have no effect. Unexpectedly, (R,S)-carvedilol which inhibits both alpha- and beta-adrenoceptors does not decrease melatonin production. Conclusion: These findings indicate that beta-blockers decrease melatonin release via specific inhibition of adrenergic beta1-receptors. Since lower nocturnal melatonin levels might be the reason for sleep disturbances, further clinical studies should investigate whether or not oral administration of melatonin might avoid this well-known side-effect of beta-blockers. The reason why (R,S)-carvedilol does not influence melatonin production remains to be determined.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0983
    Keywords: Intron loss ; Cuscuta europaea ; Plastid rps12 ; Homoplasy ; Trans-splicing ; Pseudogene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The gene cluster rps12/rps7/ΨndhB of the plastome from the holoparasitic plant Cuscuta europaea has been analysed at the nucleotide level. A comparison with the homologous region of the plastome from the closely related parasite Cuscuta reflexa reveals a complete loss of the cis-spliced intron of the rps12 gene in addition to a drastic size reduction of the ndhB pseudogene. It is demonstrated by RT-PCR analysis that the entire gene cluster is transcribed in the form of a multicistronic transcript which also includes the sequences encoded by the ndhB pseudogene. A cDNA containing the correctly transspliced exon 1 of the rps12 transcript can also be amplified. This shows that trans-splicing of the rps12 transcript persists in the plastids of the holoparasite despite the loss of the cis-spliced intron and the loss of many other gene functions. The rps12 and rps7 genes, therefore, still appear to code for functional ribosomal proteins CS12 and CS7, respectively. The conservation of apparently intact ribosomal-protein genes from which correctly processed transcripts are produced is taken as evidence that the translational apparatus of the plastids is still functional and necessary for the expression of the genes remaining in the reduced plastome of a parasitic plant.
    Type of Medium: Electronic Resource
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