Search Results - (Author, Cooperation:N. D. Johnson)
-
1Latest Papers from Table of Contents or Articles in PressPetrie, K. L., Palmer, N. D., Johnson, D. T., Medina, S. J., Yan, S. J., Li, V., Burmeister, A. R., Meyer, J. R.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-03-30Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Evolution, MicrobiologyPublished by: -
2Latest Papers from Table of Contents or Articles in PressR. Lister ; E. A. Mukamel ; J. R. Nery ; M. Urich ; C. A. Puddifoot ; N. D. Johnson ; J. Lucero ; Y. Huang ; A. J. Dwork ; M. D. Schultz ; M. Yu ; J. Tonti-Filippini ; H. Heyn ; S. Hu ; J. C. Wu ; A. Rao ; M. Esteller ; C. He ; F. G. Haghighi ; T. J. Sejnowski ; M. M. Behrens ; J. R. Ecker
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-07-06Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: 5-Methylcytosine/metabolism ; Adult ; Animals ; Base Sequence ; Conserved Sequence ; Cytosine/*analogs & derivatives/metabolism ; *DNA Methylation ; *Epigenesis, Genetic ; Epigenomics ; Frontal Lobe/*growth & development ; *Gene Expression Regulation, Developmental ; Genome-Wide Association Study ; Humans ; Longevity ; Mice ; Mice, Inbred C57BL ; X Chromosome Inactivation/geneticsPublished by: -
3Articles: DFG German National LicensesStaff View
ISSN: 1432-1939Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Summary The chaparral shrub Eriodictyon californicum secretes a phenolic leaf resin composed of flavonoid aglycones. We used leaves with artificially altered resin contents to test the effects of resin on the feeding, growth, and oviposition of the specialist herbivore Trirhabda diducta. In addition, we compared Trirhabda feeding and growth on young foliage with that on foliage from the preceding year. Our results show that the Eriodictyon leaf resin affects Trirhabda larvae and adults similarly, having no significant effect on growth rates or on nutrient utilization at up to 5X the resin levels normally encountered by larvae in the field. Both Trirhabda larvae and adults respond to high resin concentrations by increasing their consumption rates, with concomitant decreases in digestibility and the efficiency of conversion of ingested food to biomass. Low-resin foliage is preferred by larvae for feeding and by adults for oviposition. Larvae feeding on leaves of the current season have higher growth efficiencies, consumption, and growth compared to larvae feeding on leaves from the preceding year.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 1432-1939Keywords: Lupinus succulentus ; Fabaceae ; Lupine ; Quinolizidine alkaloids ; Nitrogen fixation ; Defoliation ; Plant-herbivore interactionsSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Summary We examined the effects of nitrogen nutrition and defoliation on the alkaloids, nitrogen levels, and growth of Lupinus succulentus by growing plants under five nitrogen/defoliation treatments: 1) fertilization with a high-nitrate nutrient solution, 2) fertilization with a low-nitrate solution, 3) inoculation with N-fixing bacteria but without available soil nitrogen, 4) high-nitrate solution plus periodic partial defoliation, and 5) low-nitrate plus defoliation. In the absence of defoliation, plants from both the N-fixing and high-N treatments had higher concentrations of alkaloids and nitrogen, and higher growth rates than the low-N plants. Periodic defoliation had little effect on the high-N plants, but defoliated N-fixing plants were severely stunted and had lower alkaloid and nitrogen levels. The experimental treatments also affected the relative concentrations of the alkaloids. Our results indicate that 1) alkaloid composition and concentration in L. succulentus are determined by both nitrogen availability and developmental state, 2) plants relying solely on N-fixation respond quite differently to defoliation than those with adequate soil nitrogen, and 3) the food value of the plant tissue can be affected by an interaction between the effects of defoliation and nitrogen status.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1432-1939Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Summary The chaparral shrub Eriodictyon californicum produces a flavonoid leaf resin with a chemically similar composition to that previously reported for the sympatric shrub Diplacus aurantiacus. We determined the phenology, resin content, and nitrogen content of Eriodictyon leaves and the leaf area lost to herbivores. Nitrogen content and resin content were both negatively correlated with leaf age at each sampling date, but nitrogen decreased during the growing season while resin increased. The fraction of leaf area lost during the growing season averaged less than 7% and was highest on the oldest leaves. The seasonal pattern of resin production in Eriodictyon corresponds to that in Diplacus, indicating that the similar environments of Eriodyctyon and Diplacus have led to convergent leaf resins. This convergence in these two plants has implications for chemicals of similar function in other chaparral shrubs.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1434-601XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The 2.41 min ground state decay of108Ag has been studied with a Ge(Li) detector. Twelve transitions are observed of which seven have not been reported previously. Five of the new transitions are placed in the level scheme which includes the second 2+, 930.4 keV level and a new level at 1539.4 keV in108Pd.Type of Medium: Electronic ResourceURL: