Library

X
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
    Arylsulfatase activity of microbial biomass in soils as affected by cropping systems (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 46-54 
    Details
    ISSN: 1432-0789
    Keywords: Key words Arylsulfatase activity ; Chloroform-fumigation method ; Biomass enzymes ; Crop rotations ; N fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The impacts of crop rotations and N fertilization on different pools of arylsulfatase activity (total, intracellular, and extracellular) were studied in soils of two long-term field experiments in Iowa to assess the contibution of the microbial biomass to the activity of this enzyme. Surface-soil samples were taken in 1996 and 1997 in corn, soybeans, oats, or meadow (alfalfa) plots that received 0 or 180 kg N ha–1 before corn, and an annual application of 20 kg P ha–1 and 56 kg K ha–1. The arylsulfatase activity in the soils was assayed at optimal pH (acetate buffer, pH 5.8) before and after chloroform fumigation; microbial biomass C (Cmic) and N (Nmic) were determined by chloroform-fumigation methods. All pools of arylsulfatase activity in soils were significantly affected by crop rotation and plant cover at sampling time, but not by N fertilization. Generally, the highest total, intracellular, and extracellular arylsulfatase activities were obtained in soils under cereal-meadow rotations, taken under oats or meadow, and the lowest under continuous cropping systems.Total, intracellular, and extracellular arylsulfatase activities were significantly correlated with Cmic (r〉0.41, P〈0.01) and Nmic (r〉0.38, P〈0.01) in soils. The averages of specific activity values, i.e., of arylsulfatase activity of the microbial biomass, expressed per milligram Cmic, ranged from 315 to 407 μg p-nitrophenol h–1. The total arylsulfatase activity was significantly correlated with the intracellular activity, with r values 〉0.79 (P〈0.001). In general, about 45% of the total arylsulfatase activity was extracellular, and 55% was associated with the microbial biomass in soils, indicating the importance of the microflora as an enzyme source in soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050523
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Laser-induced dendritic structures on PET (polyethylene- terephthalate): the importance of redeposited ablation products (1999)
    Springer
    Applied physics 69 (1999), S. S487 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.62; 61.80; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Single-pulse excimer-laser irradiation of poly-ethylene-terephthalate (PET) with fluences around and above the ablation threshold leads to the formation of surface dendrites. The lateral size and the number density of dendrites depend on the laser wavelength and the type and pressure of the ambient atmosphere. The results are discussed on the basis of excimer-laser-induced polymer fragmentation and the redeposition of ablation products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051447
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Thermophysical Properties of Structurally Relaxed Pd〈sub〉40〈/sub〉Ni〈sub〉40〈/sub〉P〈sub〉20〈/sub〉 Samples (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 225-227 (July 1996), p. 101-106 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.225-227.101.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    An optical supernova associated with the X-ray flash XRF 060218 (2006)
    [s.l.] : Nature Publishing Group
    Nature 442 (2006), S. 1011-1013 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Long-duration γ-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supernovae were not hitherto known to be associated with GRBs, and therefore GRB–supernovae were thought to be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05082
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    X-ray halos as a possible constraint on an intergalactic dust component
    Amsterdam : Elsevier
    Advances in Space Research 13 (1993), S. 327-330 
    Details
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(93)90132-U
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Structure and properties of quasi-amorphous films prepared by ion beam techniques
    Amsterdam : Elsevier
    Thin Solid Films 72 (1980), S. 19-32 
    Details
    ISSN: 0040-6090
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6090(80)90554-4
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Urease activity of microbial biomass in soils as affected by cropping systems (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 191-199 
    Details
    ISSN: 1432-0789
    Keywords: Key words Urease activity ; Chloroform fumigation method ; Crop rotations ; Intracellular enzyme activity ; Extracellular enzyme activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The impacts of crop rotations and N fertilization on different pools of urease activity were studied in soils of two long-term field experiments in Iowa; at the Northeast Research Center (NERC) and the Clarion-Webster Research Center (CWRC). Surface soil samples (0–15 cm) were taken in 1996 and 1997 in corn, soybeans, oats, or meadow (alfalfa) plots that received 0 or 180 kg N ha–1, applied as urea before corn and an annual application of 20 kg P and 56 kg K ha–1. The urease activity in the soils was assayed at optimal pH (THAM buffer, pH 9.0), with and without toluene treatment, in a chloroform-fumigated sample and its nonfumigated counterpart. The microbial biomass C (Cmic) and N (Nmic) were determined by chloroform fumigation methods. The total, intracellular, extracellular and specific urease activities in the soils of the NERC site were significantly affected by crop rotation, but not by N fertilization. Generally, the highest total urease activities were obtained in soils under 4-year oats–meadow rotations and the lowest under continuous corn. The higher total activities under multicropping systems were caused by a higher activity of both the intracellular and extracellular urease fractions. In contrast, the highest values for the specific urease activity, i.e. of urease activity of the microbial biomass, were found in soils under continuous soybean and the least under the 4-year rotations. Total and extracellular urease activities were significantly correlated with Cmic (r〉0.30* and 〉0.40**) and Nmic (r〉0.39** and 〉0.44**) in soils of the NERC and CWRC sites, respectively. Total urease activity was significantly correlated with the intracellular activity (r〉0.73***). About 46% of the total urease activity of the soils was associated with the microbial biomass, and 54% was extracellular in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050645
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Soil microbial biomass carbon and nitrogen as affected by cropping systems (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 200-210 
    Details
    ISSN: 1432-0789
    Keywords: Key words Crop rotation ; Organic carbon ; Organic nitrogen ; Long-term cropping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The impacts of crop rotations and N fertilization on microbial biomass C (Cmic) and N (Nmic) were studied in soils of two long-term field experiments initiated in 1978 at the Northeast Research Center (NERC) and in 1954 at the Clarion-Webster Research Center (CWRC), both in Iowa. Surface soil samples were taken in 1996 and 1997 from plots of corn (Zea mays L.), soybeans (Glycine max (L.) Merr.), oats (Avena sativa L.), or meadow (alfalfa) (Medicago sativa L.) that had received 0 or 180 kg N ha–1 before corn and an annual application of 20 kg P and 56 kg K ha–1. The Cmic and Nmic values were determined by the chloroform-fumigation-extraction method and the chloroform-fumigation-incubation method, respectively. The Cmic and Nmic values were significantly affected (P〈0.05) by crop rotation and plant cover at time of sampling, but not by N fertilization. In general, the highest Cmic and Nmic contents were found in the multicropping systems (4-year rotations) taken in oats or meadow plots, and the lowest values were found in continuous corn and soybean systems. On average, Cmic made up about 1.0% of the organic C (Corg), and Nmic contributed about 2.4% of the total N (Ntot) in soils at both sites and years of sampling. The Cmic values were significantly correlated with Corg contents (r≥0.41**), whereas the relationship between Cmic and Ntot was significant (r≤0.53***) only for the samples taken in 1996 at the NERC site. The Cmic : Nmic ratios were, on average, 4.3 and 6.4 in 1996, and 7.6 and 11.4 in 1997 at the NERC and CWRC sites, respectively. Crop rotation significantly (P〈0.05) affected this ratio only at the NERC site, and N fertilization showed no effect at either site. In general, multicropping systems resulted in greater Cmic : Corg (1.1%) and Nmic : Ntot (2.6%) ratios than monocropping systems (0.8% and 2.1%, respectively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050646
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Bilaterale laparoskopische transperitoneale Adrenalektomie beim Phäochromozytom (1997)
    Springer
    Langenbeck's archives of surgery 382 (1997), S. 37-42 
    Details
    ISSN: 1435-2451
    Keywords: Key words Pheochromocytoma ; Minimally invasive surgery ; Bilateral transperitoneal adrenalectomy ; Schlüsselwörter Phäochromozytom ; Minimalinvasive Chirurgie ; Bilaterale transperitoneale Adrenalektomie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die minimalinvasive Chirurgie der Nebenniere ist sowohl laparoskopisch-transperitoneal als auch endoskopisch-extraperitoneal sicher und mit geringer Morbidität durchführbar. Erste vergleichende Darstellungen mit konventionell operierten Patienten belegen die Vorzüge der minimalinvasiven Technik. Gegenüber der endoskopischen retroperitonealen Adrenalektomie bietet das laparoskopisch-anteriore Vorgehen den Vorteil der übersichtlicheren Exposition unter Orientierung an anatomischen Leitstrukturen sowie die Möglichkeit von laparoskopischen Synchroneingriffen. Anhand 2er Fallberichte wird die von uns angewandte transperitoneale Operationstechnik zur synchronen bilateralen laparoskopischen Adrenalektomie wegen eines beidseitigen Phäochromozytoms beschrieben. Die Operationszeiten betrugen 210 bzw. 270 min, der intraoperative Blutverlust lag bei 350 bzw. 400 ml. Postoperative Komplikationen traten nicht auf, eine vollständige körperliche Mobilität war bereits am 1. postoperativen Tag gegeben. Immunologische Untersuchungen belegen die geringe Invasivität des Eingriffs.
    Notes: Abstract Laparoscopic transperitoneal and endoscopic extraperitoneal adrenalectomy are two safe options in minimally invasive surgery associated with a very low morbidity. Comparative studies with the conventional access to the adrenal gland demonstrated the advantages of the endoscopic technique. The anterior transperitoneal approach yields a better exposure of the anatomic structures and allows the surgeon to orient himself more easily, while at the same time he may perform additional laparoscopic maneuvers. In two cases of bilateral pheochromocytoma a bilateral laparoscopic adrenalectomy was performed simultaneously by employing the transperitoneal approach. The duration of surgery was approximately 210 and 270 min, respectively, with an intraoperative blood loss of about 350 and 400 ml. There were no complications following this procedure. Already on the 1st postoperative day, the patients could be fully mobilized. Furthermore, immunological data obtained perioperatively support the minimal invasiveness of this technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00008009
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    On the geometrical cross-section of an N-mer (1986)
    Springer
    Astrophysics and space science 128 (1986), S. 43-46 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have modeled the growth of an N-mer by means of Monte-Carlo calculations. The geometrical cross-section of the N-mer is measured and compared with the one obtained if one assumes that the N-mer is of spherical form. A difference up to a factor of 2 was found forN≤30.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656017
    Library Location Call Number Volume/Issue/Year 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...