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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of bacterial diversity in Pulque, a traditional Mexican alcoholic fermented beverage, as determined by 16S rDNA analysis (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 235 (2004), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The bacterial diversity in pulque, a traditional Mexican alcoholic fermented beverage, was studied in 16S rDNA clone libraries from three pulque samples. Sequenced clones identified as Lactobacillus acidophilus, Lactobacillus strain ASF360, L. kefir, L. acetotolerans, L. hilgardii, L. plantarum, Leuconostoc pseudomesenteroides, Microbacterium arborescens, Flavobacterium johnsoniae, Acetobacter pomorium, Gluconobacter oxydans, and Hafnia alvei, were detected for the first time in pulque. Identity of 16S rDNA sequenced clones showed that bacterial diversity present among pulque samples is dominated by Lactobacillus species (80.97%). Seventy-eight clones exhibited less than 95% of relatedness to NCBI database sequences, which may indicate the presence of new species in pulque samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.2004.tb09599.x
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  • 2
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    Las fechas C. 14 del yacimiento de los Tolmos de Caracena (Soria) (1982)
    Madrid : Periodicals Archive Online (PAO)
    Trabajos de prehistoria. 39 (1982) 335 
    Details
    ISSN: 0082-5638
    Topics: Archaeology
    Notes: NOTICIARIO ARQUEOLOGICO
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:n093-1982-039-00-000012
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  • 3
    Electronic Resource
    Electronic Resource
    Efficiency of insecticidal crystal protein production in a Bacillus thuringiensis mutant with derepressed expression of the terminal oxidase aa 3 during sporulation (1993)
    Springer
    Applied microbiology and biotechnology 39 (1993), S. 558-562 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A Bacillus thuringiensis respiratory mutant (AB1 strain) that shows premature sporulation and insecticidal crystal protein (ICP) production was isolated. The mutant strain harbours the cryIC and cryID insecticidal genes and could be important for the production of ICP highly toxic to Spodoptera sp. The mutant was selected by its increased capacity to oxidize. N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD). In this strain, cytochrome aa 3 expression is not repressed during the sporulation phase, in contrast with the wild-type strain. The growth, spore production, dissolved O2, O2 consumption, CO2 evolution rate and ICP production were recorded as a function of time. The AB1 mutant strain has a similar growth yield to the wild-type strain, but begins sporulation at least 4 h earlier. The AB1 strain consumes 74.5% more O2 than the wild-type strain, during the fermentation process. The mutation on strain AB1 has an important positive effect on ICP production. This procedure shows that ICP production could be increased during fermentation by increasing the respiration capacity of Bacillus thuringiensis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00205051
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  • 4
    Electronic Resource
    Electronic Resource
    Characterisation with stable isotopes of the presence of a lag phase in the gastric emptying of liquids (2000)
    Springer
    European journal of nutrition 39 (2000), S. 224-228 
    Details
    ISSN: 1436-6215
    Keywords: Key words Gastric emptying – Liquid meal – Lag phase – Stable isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Notes: Summary Background Gastric emptying of non-nutrient liquids usually lacks the presence of an initial delay phase (lag phase), and so it has been considered to be monoexponential with an initial rapid phase followed by a slower emptying phase. However a lag phase in the gastric emptying of liquids can be found if there is a high caloric density in the liquid meal. Aims of the study To characterise with stable isotopes the presence of a lag phase in the gastric emptying of non-sold meals. Methods Healthy volunteers ingested a low caloric liquid meal (345 KJ/200 mL) (LCLM), a high caloric liquid meal (1135 KJ/180 mL) (HCLM) or a semisolid meal (1403 KJ/500 mL) (SSM). Test meals were labelled with 13C-acetate. Breath samples were collected for 13〉CO2 measurement and data were fitted to a power exponential function. Results Non-solid meals can have different behaviour related to the initial emptying. The presence of a lag phase in the gastric emptying of liquids was not masked by the processing of the tracer previous to its detection in breath. While the LCLM and SSM showed a rapid initial emptying phase (no lag phase), the HCLM has an initial slow emptying phase. The slower gastric emptying of the HCLM compared to the SSM was related to the presence of a lag phase in the gastric emptying of the HCLM. Conclusions The 13C-acetate breath test is very accurate to identify and study the lag phase if present of liquid meals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003940070015
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  • 5
    Electronic Resource
    Electronic Resource
    Stimulation of glucose catabolism through the pentose pathway by the absence of the two pyruvate kinase isoenzymes in Escherichia coli (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 58 (1998), S. 292-295 
    Details
    ISSN: 0006-3592
    Keywords: metabolic engineering ; carbon metabolism ; Escherichia coli mutants ; microbial growth ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Escherichia coli strains devoid of one or both of the two pyruvate kinase isoenzymes (PKA and PKF), were grown on minimal media in batch fermentations. The strain lacking both PKs showed a 28% decrease on its specific growth rate when compared to the wild type. However, protein and CO2 yields did not change. Using radioactive 1-C14 glucose and collecting the CO2 produced by the cultures, it was found that the mutant lacking both pyruvate kinases, metabolized glucose mainly through the pentose pathway (PP). The increased participation of the PP in glucose metabolism in this strain, was also reflected on the levels of the glucose-6-phosphate and 6-phosphogluconate dehydrogenases.© 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 58:292-295, 1998.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Nitric oxide synthase in invertebrates (1995)
    Springer
    Journal of molecular histology 27 (1995), S. 770-776 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The gas nitric oxide is now recognized as an important signalling molecule that is synthesized from l-arginine by the enzyme nitric oxide synthase. This enzyme can be localized by different methods, including immunocytochemistry and the histochemical reaction for NADPH diaphorase. It has been demonstrated in various vertebrate cells and tissues, and recently several studies dealing with the production of nitric oxide in invertebrates have been published. Diploblastic animals, flatworms and nematodes seem to lack NADPH diaphorase activity but it has been found in the rest of the phyla studied. The most frequently reported sites for the production of nitric oxide are the central and peripheral nervous systems and, in primitive molluscs, the muscle cells. In insects, it has also been described in the Malpighian tubules. The roles of nitric oxide in invertebrates are closely related to the physiological actions described in vertebrates, namely, neurotransmission, defence, and salt and water balance. The recent cloning of the first nitric oxide synthase from an invertebrate source could open interesting avenues for further studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171757
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  • 7
    Electronic Resource
    Electronic Resource
    Nitric oxide synthase in invertebrates (1995)
    Springer
    Journal of molecular histology 27 (1995), S. 770-776 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The gas nitric oxide is now recognized as an important signalling molecule that is synthesized froml-arginine by the enzyme nitric oxide synthase. This enzyme can be localized by different methods, including immunocytochemistry and the histochemical reaction for NADPH diaphorase. It has been demonstrated in various vertebrate cells and tissues, and recently several studies dealing with the production of nitric oxide in invertebrates have been published. Diploblastic animals, flatworms and nematodes seem to lack NADPH diaphorase activity but it has been found in the rest of the phyla studied. The most frequently reported sites for the production of nitric oxide are the central and peripheral nervous systems and, in primitive molluscs, the muscle cells. In insects, it has also been described in the Malpighian tubules. The roles of nitric oxide in invertebrates are closely related to the physiological actions described in vertebrates, namely, neurotransmission, defence, and salt and water balance. The recent cloning of the first nitric oxide synthase from an invertebrate source could open interesting avenues for further studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02388302
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  • 8
    Electronic Resource
    Electronic Resource
    Peptidylglycine α-amidating monooxygenase (PAM) immunoreactivity and messenger RNA in human pituitary and increased expression in pituitary tumours (1994)
    Springer
    Cell & tissue research 276 (1994), S. 197-207 
    Details
    ISSN: 1432-0878
    Keywords: Pituitary ; Tumours ; Peptidylglycine α-amidating monooxygenase-Immunocytochemistry ; In situ hybridisation ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Bioactivity of many peptides depends upon post-translational α-amidation of inactive precursors by two enzyme activities known collectively as peptidylglycine α-amidating monooxygenase (PAM). PAM enzymes are particularly abundant in the pituitary. The distribution of PAM immunoreactivity and messenger ribonucleic acid (mRNA) in the adult human pituitary and in pituitary tumours was investigated by use of immunocytochemistry and in situ hybridisation. Immunoreactivity was present in numerous cells of the anterior lobe: staining was intense in a proportion of gonadotrophs and folliculo-stellate cells, but weaker in the majority of somatotrophs and lactotrophs, a few corticotrophs and occasional thyrotrophs. PAM staining was also present in nerves, pituicytes and some endocrine cells within the posterior lobe (the human intermediate zone). Forty pituitary tumours of various types were immunoreactive for PAM; more intensely and uniformly stained than normal anterior lobe. In situ hybridisation with digoxigenin-labelled probes demonstrated intense labelling for PAM mRNA in numerous cells in normal anterior pituitary and in tumours. Many regulatory peptides that require amidation for activity, potential targets for PAM, are present in the pituitary. Many tumour growth factors also require amidation and PAM may regulate these mitogenic peptides in tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354800
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  • 9
    Electronic Resource
    Electronic Resource
    Peptidylglycine α-amidating monooxygenase (PAM) immunoreactivity and messenger RNA in human pituitary and increased expression in pituitary tumours (1994)
    Springer
    Cell & tissue research 276 (1994), S. 197-207 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Pituitary – Tumours – Peptidylglycine α-amidating monooxygenase -Immunocytochemistry – In situ hybridisation – Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Bioactivity of many peptides depends upon post-translational α-amidation of inactive precursors by two enzyme activities known collectively as peptidylglycine α-amidating monooxygenase (PAM). PAM enzymes are particularly abundant in the pituitary. The distribution of PAM immunoreactivity and messenger ribonucleic acid (mRNA) in the adult human pituitary and in pituitary tumours was investigated by use of immunocytochemistry and in situ hybridisation. Immunoreactivity was present in numerous cells of the anterior lobe: staining was intense in a proportion of gonadotrophs and folliculo-stellate cells, but weaker in the majority of somatotrophs and lactotrophs, a few corticotrophs and occasional thyrotrophs. PAM staining was also present in nerves, pituicytes and some endocrine cells within the posterior lobe (the human intermediate zone). Forty pituitary tumours of various types were immunoreactive for PAM; more intensely and uniformly stained than normal anterior lobe. In situ hybridisation with digoxigenin-labelled probes demonstrated intense labelling for PAM mRNA in numerous cells in normal anterior pituitary and in tumours. Many regulatory peptides that require amidation for activity, potential targets for PAM, are present in the pituitary. Many tumour growth factors also require amidation and PAM may regulate these mitogenic peptides in tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354800
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  • 10
    Electronic Resource
    Electronic Resource
    A new pneumatic bearing dynamometer for power input measurement in stirred tanks (1991)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 14 (1991), S. 105-108 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A turntable dynamometer has been constructed for the accurate measurement of power input and mixing applications in bench stirred tank reactors. The main feature of this device is a pneumatic bearing with complementary conical parts. The conical pneumatic bearing permitted to apply eccentric loads without affecting its stability. The static friction torque in the pneumatic bearing was very small, 4 × 10-4 Nm, and can be neglected in the experimental ranges of measured torques, i.e. from 5 × 10-3 to 2.21 Nm. In accordance with the instrumentation used, the deviations obtained with the apparatus are less than 10% at low torque readings. At moderate torques, deviations lower than 1% are routinely obtained. Several power input measurements show that the obtained data scatter is lower than 2.5%. The power input response in the turbulent regime is in agreement with dimensional analysis: the power input depends on the cube of the impeller speed. In addition, data obtained with a turbine impeller under ungassed conditions agree with the predictions of a published correlation, which takes into account several geometrical parameters.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270140206
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