Although the physiological nitrogen demand of the soil microbial biomass is a major determinant of N mineralization in forest soils, the exact nature of the relationship is unclear. This study investigated the relationships between a respiration-based indicator of microbial physiological N demand (NIR) and N availability in forest soils. NIR was found to correlate significantly with net mineralized N in the field and annual foliar litterfall N fluxes. In a laboratory incubation, NIR was shown to be sensitive to changes in soil available C and N pools. These results demonstrated that microbial physiological N demand is determined by relative availabilities of labile C and N, and that it is significantly related to N cycling in forest soils. Results from a seasonal study of a forested watershed suggest that nutrient availability determined tree production and soil C availability, which in turn determined microbial physiological N demand and nitrogen dynamics in the forest.

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/ line-height:115% / } @page Section1 {size:8.5in 11.0in / margin:1.0in 1.0in 1.0in 1.0in / mso-header-margin:.5in / mso-footer-margin:.5in / mso-paper-source:0 / } div.Section1 {page:Section1 / } --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal" / mso-tstyle-rowband-size:0 / mso-tstyle-colband-size:0 / mso-style-noshow:yes / mso-style-priority:99 / mso-style-qformat:yes / mso-style-parent:"" / mso-padding-alt:0in 5.4pt 0in 5.4pt / mso-para-margin-top:0in / mso-para-margin-right:0in / mso-para-margin-bottom:10.0pt / mso-para-margin-left:0in / line-height:115% / mso-pagination:widow-orphan / font-size:11.0pt / font-family:"Calibri","sans-serif" / mso-ascii-font-family:Calibri / mso-ascii-theme-font:minor-latin / mso-fareast-font-family:"Times New Roman" / mso-fareast-theme-font:minor-fareast / mso-hansi-font-family:Calibri / mso-hansi-theme-font:minor-latin / mso-bidi-font-family:"Times New Roman" / mso-bidi-theme-font:minor-bidi / } </style> <![endif]--> <p class="MsoNormal"><span style="font-size: 12pt / line-height: 115% / font-family: &quot / Times New Roman&quot / ,&quot / serif&quot / ">The heterogeneous photocatalytic oxidation of dinitrogen to nitrate, NO3 and/or nitrite, no2 using peroxy species of titanium (IV) in aqueous suspensions has been investigated. The photocatalysts used were titanium peroxide and Degussa p25 TiO2 pretreated with H2O2. These photocatalysts were investigated by SEM and FTIR spectroscopy. <span style="">&nbsp / </span><o:p></o:p></span></p> <span style="font-size: 12pt / font-family: &quot / Times New Roman&quot / ,&quot / serif&quot / "><o:p></o:p></span></p> </p>

This experiment was conducted to determine if changing the amount of ideal aminoacids (meaning the amount of amino acids necessary to supply all the animal's needswithout excesses or deficiencies of any single amino acid), in relation to caloric intakewill change nitrogen metabolism and weight loss in obese mature dogs. Informationprovided by this experiment can be used to formulate canine diets emphasizing weightloss in older animals.Six moderately obese mature female crossbred hounds were fed diets varying in theirratio of lysine:calories (Lysine % : Mcal ME/g) (2.2, 3.0, and 3.8) in a 3 x 3 replicatedLatin square design. Increasing the lysine:calorie of the diets linearly increased theamount of nitrogen absorbed. It did not, however, significantly affect blood chemistryvalues. Protein turnover exhibited a positive linear trend with increasing ratio and proteindegradation showed a strong quadratic change with the lowest point of degradationoccurring with the diet containing a 3.0 lysine:calorie ratio. Plasma urea and creatinineexcretion demonstrated quadratic tendencies with the two highest values occurring withthe diets containing lysine:calorie of 2.2 and 3.8, reflecting changes in muscle proteinbreakdown while nitrogen was retained in the body. Caloric restriction did not result inloss of lean mass as much as a loss of fat mass. By increasing the quality of protein fedas a percentage of caloric intake, lean muscle mass was conserved during periods ofcaloric restriction.

Trifolium ambiguum (Caucasian clover) is being released in New Zealand for use in areas where growth of T. repens (white clover) is marginal. Although closely related to T. repens, T. ambiguum has unique and highly specific nodulation requirements and as rhizobial strains capable of effectively nodulating T. ambiguum are not naturally found in New Zealand soils, they must be introduced with the seed. Rhizobium leguminosarum bv. trifolii strains such as ICC105 form effective nodules on T. ambiguum but ineffective (Fix⁻) nodules on T. repens. The T. repens nodules nevertheless develop normally and contain bacteroids. R. l. bv. trifolii strains that are effective on T. repens such as NZP561, fail to nodulate T. ambiguum. As the host-specific nitrogen fixation defect of Caucasian clover rhizobia on T. repens has potentially adverse agronomic implications, the genetic basis for this Fix⁻ phenotype was investigated. Rhizobium leguminosarum bv. trifolii strain ICC105 was converted to Fix⁺ on T. repens by the introduction of an 18-kb fragment of DNA from a white clover rhizobial strain (NZP514) symbiotic plasmid. This fragment contained several nif and fix genes, including nifHDKEN, fixABCX, nifA, nifB, fdxN and fixU. Tn5 mutation of these white clover rhizobial genes demonstrated that most were required to impart the Fix⁺ phenotype on T. repens to ICC105, with the exception of nifA. Mutagenesis of the ICC105 nifA gene and subsequent complementation with various combinations of the white clover rhizobia nif/fix genes as well as transcriptional lacZ fusion studies of the ICC105 nifA and nifH genes demonstrated that ICC105 nifA is expressed and functional during the ineffective nodulation of T. repens and able to activate expression of nifHDKEN and fixABCX operons derived from white clover rhizobium but not from ICC105. Sequence analysis and comparison of the intergenic region between the divergently transcribed nif/fix operons revealed a conserved 111-bp region found between the nifH/fixA promoters of Caucasian clover rhizobia, but not in white clover rhizobia. Attempts to modify this region in ICC105 failed in creating a strain which was Fix⁺ on T. repens; however recombination of the nifHD/fixAB region from a white clover rhizobium into the ICC105 genome produced several strains with a �swapped� nitrogen fixation phenotype (i.e. Fix⁺ on T. repens and Fix⁻ on T. ambiguum). A hypothesis was therefore proposed by which differences in the nifH/fixA promoter regions of Caucasian clover rhizobia and white clover rhizobia modulate the expression of the upstream genes in response to the particular plant host they are nodulating. The incompatibility between the symbiotic plasmid of R. l. bv. trifolii ICC105 and the white clover rhizobium symbiotic plasmid cointegrate, pPN1, was also investigated and potential regions of each plasmid involved in this incompatibility were identified. The research presented in this thesis has contributed to the genetic knowledge of the nitrogen fixation genes, and regulation of these genes in R. l. bv. trifolii. It has also provided progress towards the goal of creating a suitable inoculant strain for T. ambiguum that is able to fix nitrogen in symbiosis with both T. repens and T. ambiguum.

Bibliography: leaves 183-202 / xxiv, 202 leaves, [46] leaves of plates : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Agricultural Biochemistry, Waite Agricultural Research Institute, 1984

Bibliography: leaves 142-164 / xxi, 165 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, 1985

Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 78-89).

Thesis (Ph. D.)--University of California, San Diego, 1998. / Vita. Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [90]-114).

Thesis (M.S.)--Michigan State University. Dept. of Horticulture, 2008. / Title from PDF t.p. (viewed on July 28, 2009) Includes bibliographical references. Also issued in print.