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1Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2015-09-04Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Groundwater/*analysis ; *Plant Transpiration ; Plants/*metabolism ; *Rivers ; *Water MovementsPublished by: -
2Latest Papers from Table of Contents or Articles in PressS. P. Good ; D. Noone ; G. Bowen
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-07-15Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3FIS Bildung LiteraturdatenbankBencze, J. Lawrence [Verfasser] ; Bowen, G. Michael [Verfasser] ; Alsop, Steve [Verfasser]
Published 2006Staff ViewType of Medium: articlePublication Date: 2006Keywords: Methodenkompetenz ; Fallstudie ; Interview ; Einstellung (Psy) ; Vorstellung (Psy) ; Lehrer ; Entdeckendes Lernen ; Lernprozess ; Lehrmethode ; Unterrichtspraxis ; Naturwissenschaften ; Konstruktivistischer Ansatz ; ImplementierungIn: Science education, Bd. 90 (2006) H. 3, S. 400-419, 0036-8326Language: English -
4Articles: DFG German National LicensesStaff View
ISSN: 1749-6632Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Natural Sciences in GeneralType of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] In the course of some general rhizosphere studies being conducted in this laboratory, it was observed that the root systems of plants inoculated with soil suspension appeared stunted and were more easily washed free of adhering sand than corresponding sterile root systems. Some of the results of ...Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Nine hundred gram lots of two soils poor in nutrients (a podzolised soil, Mount Burr sand, South Australia4 with 3 p.p.m. sodium bicarbonate extractable P; and a lateritic podzolic soil from Dwellingup, Western Australia"5 with less than 1 p.p.m. extractable P) were wetted to 70% field capacity ...Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Krasil'nikov2 cites an instance in which phosphate uptake over 17 days was doubled by the presence of micro-organisms on barley roots, but the reverse occurred with woody plants. However, in neither instance was uptake examined in relation to root growth which can be affected by micro-organisms3. ...Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Soil was added to 20-5 cm. x 3-2 cm. test-tubes to a depth of 5 cm. and moistened to field capacity with distilled water. These were sterilized either by steam at 120 C. for 1 hr. on each of three successive days, or by propylene oxide introduced into an evacuated sterilization chamber at the rate ...Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 0009-2614Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1399-3054Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: BiologyNotes: Three isolates of Frankia from nodules of Casuarina sens, strict. (JCT287. JCT295 and 20607) were compared in their abilities to nodulate and fix N, when associated with four species of Casuarina (C. cunninghamiana Miq., C. equisetifolia Forst., C obesa Miq. and C. glauca Sieb. ex Spreng) growing in a N-deficient soil.All three Frankia isolates nodulated each of the four species of Casuarina. At 27 weeks after inoculation, growth (dry weight) of inoculated plants was 3.6 to 5.0 times greater than that of uninoculated plants. There were no significant differences in plant dry weight, the N concentration of shoots or roots, or the amount of N, fixed per plant among the Frankia isolates for each of the species of Casuarina studied. The infectivity and effectiveness in N, fixation of Frankia strain JCT287 with C. cunninghamiana was similar when two different defined media were used for culture of the inoculum.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesTrent, Dennis W. ; Monath, Thomas P. ; Bowen, G. Stephen ; Vorndam, A. Vance ; Cropp, C. Bruce ; Kemp, Graham E.
Oxford, UK : Blackwell Publishing Ltd
Published 1980Staff ViewISSN: 1749-6632Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Natural Sciences in GeneralType of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesSchneider, Donald A. ; Hardwick, Kevin S. ; Marconi, Katherine M. ; Niemcryk, Steve J. ; Bowen, G. Stephen
Oxford, UK : Blackwell Publishing Ltd
Published 1993Staff ViewISSN: 1752-7325Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: The Ryan White Comprehensive AIDS Resources Emergency (CARE) Act of 1990 was passed by Congress “to improve the quality and availability of care for individuals and families with HIV disease.” The act targets those individuals infected with HI V who lack financial resources to pay for care. While provision of oral health care is not mandated by the legislation, many oral health services are supported through five different programs receiving CARE Act funding. Legislative mandates, program guidance materials, grant applications, and other related materials were reviewed to analyze oral health care services supported or proposed through the CARE Act. In fiscal year 1991, an estimated $5.8 million of the total CARE Act funds ($229.6 million) were used for oral health care, and there is evidence that oral health concerns will receive increasing attention by grantees in future years. Opportunities exist for local oral health professionals to become involved in CARE Act programs and in the priority development process. It is possible that CARE Act grantees will serve as catalysts for the development of partnerships between private practitioners and public sector programs—relationships that could lead to improved access and quality of care for people with HIV infection.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1572-946XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsType of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1432-0789Keywords: Gliricidia sepium ; Isotope dilution ; Low P soil ; P use efficiency ; 15N uptake ; N2 fixation ; Senna siamea ; Senna spectabilisSource: Springer Online Journal Archives 1860-2000Topics: BiologyGeosciencesAgriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Abstract The variation in P uptake and use efficiency and N accumulation by Gliricidia sepium (N2-fixing tree), Senna siamea and S. spectabilis (leguminous non-N2-fixing trees) were examined in the field at Fashola (savanna zone), southwestern Nigeria, using four P rates, 0, 20, 40 and 80 kg P ha-1. Growth of G. sepium and S. spectabilis responded to P application at 24 weeks after planting (WAP) and average yield increases of 58% and 145% were observed by the application of 40 kg P ha-1 for the two species, respectively. Such a P response was not found in S. siamea at 24 WAP and for any of the species at 48 WAP. G. sepium accumulated more P (on average 162%) than S. siamea and S. spectabilis at 24 WAP and had greater root length and a higher percentage of mycorrhizal infection. However, at 48 WAP S. siamea had 2.5 times more P than G. sepium. Differences in the physiological P use efficiency (PPUE) between G. sepium and the non-N2-fixing trees were significant at the 0 P level, being higher for S. siamea (average, 0.61 g shoot mg-1 P) than for G. sepium (0.27 g shoot mg-1 P). G. sepium had a consistently lower atom % 15N than S. spectabilis, while that of S. siamea for most of the time did not differ from that of G. sepium. The reference plant affected N2 fixation extimates, with negative values and a higher variability (CV 60%) associated with S. siamea than with S. spectabilis (CV〈20%). Consequently, S. spectabilis was selected as a better reference plant for measuring N2 fixation in G. sepium. G. sepium fixed on average 35% and 54% of its N at 24 and 48 WAP, respectively. Except at the lowest P rate, percentage and amount of N fixed were not generally enhanced by P application.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 1432-0789Keywords: Agroforestry ; Cutting ; Leucaena leucocephala ; N distribution ; N2 fixation ; N uptake ; 15N isotope ; Rhizobium spp.Source: Springer Online Journal Archives 1860-2000Topics: BiologyGeosciencesAgriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Summary We studied the effect of three successive cuttings on N uptake and fixation and N distribution in Leucaena leucocephala. Two isolines, uninoculated or inoculated with three different Rhizobium strains, were grown for 36 weeks and cut every 12 weeks. The soil was labelled with 50 ppm KNO3 enriched with 10 atom % 15N excess soon after the first cutting. Except for the atom % 15N excess in branches of K28 at the second cutting, both the L. leucocephala isolines showed similar patterns of total N, fixed N2, and N from fertilizer distribution in different parts of the plant at each cutting. The Rhizobium strain did not influence the partitioning of 15N among the different plant parts. Significant differences in 15N enrichment occurred in different parts. Live nodules of both isolines showed the lowest atom % 15N excess values (0.087), followed by leaves (0.492), branches (0.552), stems (0.591), and roots (0.857). The roots contained about 60% of the total plant N and about 70% of the total N derived from fertilizer over the successive cuttings. The total N2 fixed in the roots was about 60% of that fixed in the whole plant, while the shoots contained only 20% of the fixed N2. We conclude that N reserves in roots and nodules constitute another N source that must be taken into account when estimating fixed N2 or the N balance after pruning or cutting plants. 15N enrichment declined up to about fivefold in the reference and the N2-fixing plants over 24 weeks following the 15N application. The proportion and the amounts of N derived from fertilizer decreased, while the amount derived from N2 fixation increased with time although its proportion remained constant.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 1432-0789Keywords: A value ; Acacia albida ; Cassia siamea ; Eucalyptus grandis ; Nitrogen fixing trees ; Forest rehabilitation ; Isotope dilution ; Leucaena leucocephala ; Rhizobium sppSource: Springer Online Journal Archives 1860-2000Topics: BiologyGeosciencesAgriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Summary We examined the suitability of four reference crops, i.e., two non-fixing trees,Cassia siamea andEucalyptus grandis, and two uninoculated fixing trees,Leucaena leucocephala andAcacia albida, for measuring fixed N2 fixed in inoculatedL. leucocephala andA. albida grown for 36 weeks in pots. The15N isotope-dilution (involving the addition of equal amounts of labelled N fertilizer to the non-fixing and the fixing plants) and theA-value (with different amounts of labelled N fertilizer added to the fixing and the non-fixing crops) methods were used. The isotope dilution approach gave several large negative estimates of fixed N2 inA. albida. Positive and similar values of fixed N2 were measured in all four reference crops using theA-value approach. ForL. leucocephala the isotope-dilution approach gave different estimates of fixed N2, with the different reference crops; the uninoculated N2-fixing crops indicated significantly less fixed N2 than the non-fixing reference crops. Similar values for N2 fixed inL. leucocephala were obtained using the two non-fixing trees, either by the isotope-dilution or theA-value method. On average,A. albida derived about twice as much N from fertilizer asL. leucocephala. In both species, the atom %15N excess declined by about 50% in successive harvests.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] We have been modelling the atmospheric dynamics of Mira variables, which exhibit long-period, large-amplitude radial pulsation and are known to have high mass-loss rates. Recently, we have begun using a similar approach to model other pulsating giants. There are several ways in which pulsation can ...Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Wheat (variety 'Gabo') was grown for 2. weeks in aerated plant nutrient solution2. with twenty plants per 20. 1. of solution. Intact plants were used throughout this investigation to avoid the large decrease in uptake which can occur on root excision1. Before uptake of phosphate the roots were ...Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Sterile seedlings of P. radiata were grown aseptically in large tubes plugged with cotton for 4. weeks in quarter strength complete nutrient solution5. supplemented with 36Cl-ehloride at 40 (jiOi/1. to give a final concentration of 4. x 10~4. M chloride. Before studying sites of chloride loss, the ...Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 1432-2048Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Summary Sites of phosphate uptake, translocation and loss along sterile roots of 5-day-old wheat seedlings were obtained using an automatic scanning method. Highest uptake occurred in the apical centimetre of the primary root and in the lateral root zone although appreciable uptake occurred along the whole of the root. 68% of absorbed phosphate was translocated from the apex, 84% from the midroot portion and 87% from the lateral root zone after 24 hr. Profuse production of lateral roots is seen as important in phosphate uptake and translocation. Losses of absorbed phosphate from root to solution were small and the patterns of such losses along the root corresponded with the patterns of uptake by the root. Patterns of net flux of phosphate along the root are likely to be identical with those for influx. Patterns of phosphate loss along the root are in marked contrast to those reported for chloride efflux and loss of organic materials.Type of Medium: Electronic ResourceURL: