Kaya, Zeki
Campbell, Robert K
We tested the hypothesis that intermittent (lammas) shoot growth in Douglas-fir (Pseudotsuga menziesii var menziessi (Mirb.) Franco) seedlings from dry regions of southwest Oregon is adaptively significant. Seedlings from open-pollinated families (160 total) from two inland (dry) and two coastal (wet) sources were grown under either well-watered or intermittent drought conditions (temporary drought followed by rewatering) for two growing seasons. In the first growing season, the results supported the hypothesis: the frequency of a second flush was genetically controlled (although weakly, h(f)2 less-than-or-equal-to 0.34); more seedlings, on average, from inland families than from coastal families displayed a second flush; and seedlings from inland families were more responsive to the intermittent drought regime in terms of increased frequency of a second flush (relative to the frequency in the well-watered regime). During the second growing season, the intermittent drought treatment did not promote intermittent shoot growth, although inland and coastal families had different patterns of shoot growth that reflected adaptations to soil water availability. We conclude that inland families have adapted to dry summers and short growing seasons by relying predominantly on predetermined growth for seedling height increment after the first growing season. In response to wetter and generally longer growing seasons, however, coastal families have developed a less regulated pattern of shoot extension and rely more on free growth.


Taphonomy of animal bones: Species, sex, age and breed variability of sheep, cattle and pig bone density
Pişkin, Evangelia (2003-01-01)
The results of an experiment conducted using photondensitometry to measure bone density are presented. The species examined are domestic and farmed wild pig (Sus scrofa), domestic cattle (Bos taurus) and domestic sheep (Ovis aries). Inter-taxonomic variability and intra-taxonomic differences related to sex, age and breed are discussed. A comparison of the sheep density data published by Lyman (1982) and the data obtained in this research is made. Variability was noticed not only at inter-specific level but ...
Social identity and constructions of European Union among Turkish University youth
Cem, Nevra; Hortaçsu, Nuran; Department of Psychology (2003)
The aim of this study was twofold: to investigate (i) the relationship between values, social identities, constructions of European Union (EU) and (ii) reactions to December 12th Copenhagen decision concerning Turkey. In order to fullfil the aim, two methodologically different analyses were carried out: A qualitative analysis of newspapers representing different ideologies, and a quantitative analysis of Turkish university students̕ responses to questionaries. The qualitative analysis revealed different con...
Comment on 'Rockfall avalance deposits associated with normal faulting in the NW of the Cankiri basin: implications for the post-collisional tectonic evolution of the Neo-Tethyan suture zone' by G. Seyitoglu, N. Kazanci, L. Karadenizli, S. Sen, B. Varol, and T. Karabiyikoglu
Kaymakcı, Nuretdin (Wiley, 2003-04-01)
Seyitoglu et al. (2000) described their interpretation, based on a single fault surface and rockfall avalanche deposits previously mapped as a W-vergent thrust klippen above the Neogene successions in the Hancili Basin, that in central Anatolia there was a single extensional basin throughout the Miocene - Early Pliocene. It was later fragmented by a structural high of Neo-Tethyan ophiolitic basement bounded by an E-vergent thrust fault in the east along the western margin of the Cankiri Basin and a west-dip...
Origin of diastereoselectivity in the synthesis of chiral bicyclic lactams: pi-facial selective attack of singlet oxygen induced by hindered internal rotation
Catak, Saron; Celik, Hasan; Demir, Ayhan Sıtkı; Aviyente, Viktorya (American Chemical Society (ACS), 2007-07-05)
Previously reported experimental results indicate that photooxygenation of homochiral N-(hydroxyalkyl)-2-methylpyrroles with singlet oxygen yields transrather than cis-bicyclic lactams as the major product. In this study, the origin of selectivity in this reaction has been investigated with computational methods. Relative stabilities of homochiral N-(hydroxyalkyl)-2-methylpyrrole conformers and their effect on pi-facial selectivity of O-1(2) were extensively studied. Stepwise and concerted reaction mechanis...
Fine tuning of color via copolymerization and its electrochromic device application
ÇAMURLU, PINAR; Sahmetlioglu, Ertugrul; Sahin, Elif; Akhmedov, Idris Mecidoglu; Tanyeli, Cihangir; Toppare, Levent Kamil (Elsevier BV, 2008-04-30)
In this study electrochemical copolymerization of 1-(perfluorophenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole and 3,4-ethylenedioxythiophene was used to fulfill a strategy in achieving desired multichromic properties. The resultant polymer displayed distinct color changes between red-violet, amber, green and blue color with good switching times and optical contrast. A direct correlation between the color of the polymer in neutral state and the applied potential during synthesis was observed. Hence, it was possible...
Citation Formats
Z. Kaya and R. K. Campbell, “ADAPTIVE SIGNIFICANCE OF INTERMITTENT SHOOT GROWTH IN DOUGLAS-FIR SEEDLINGS,” TREE PHYSIOLOGY, pp. 1277–1289, 1994, Accessed: 00, 2020. [Online]. Available: