After more than a century of research the typical growth pattern of a tree was thought to be fairly well understood. Following germination height growth accelerates for some time, then increment peaks and the added height each year becomes less and less. The cross sectional area (basal area) of the tree follows a similar pattern, but the maximum basal area increment occurs at some time after th...

From 1962 through 1998,20prescribed burns were applied in a natural stand of longleafpine (Pinus palustris Mill.) to determine the ejfects of variousfire regimes on theforestplant community. The original longleaf seedlings regeneratedfrom the 1955 seed crop and were growing in a grass-dominated cover when the study began. By 1999, prescribed burning in March and May resulted in a significantly ...

Basal cell carcinoma (BCC) is a malignant tumor of epithelial cells that is composed of cells similar to those in the basal area of the epidermis and its appendages. Ninety- five percent of individuals with BCC are between 40 and 79 years old. It rarely occurs in younger individuals. Herein, a 20- year- old woman with type III skin, who had a BCC on her chin is presented. Since the clinic...

Pancreatic ductal adenocarcinoma (PDAC) is a highly lethal neoplasm characterized by a 'fortress' of thick collagen fibres, abundant myofibroblasts, and paradoxically reduced vascularization compared to normal pancreas. Despite these features, PDAC shows no reduction in the uptake of glucose that fuels tumour cell survival. In new work published in The Journal of Pathology, Saiyin and colleague...

We studied the effects of five thinning treatments (T1 = 5.5, T2 = 11, T3 = 16.5, T4 = 22.5 and T5 = 28.5 m(2) ha(-1) basal area under bark) x two fertilizer treatments (F0 = unfertilized and F1 = fertilized with 400 kg ha(-1) N plus 229 kg ha(-1) P) on growth and water relations of pole-sized Eucalyptus marginata J. Donn ex Sm. trees growing in southwestern Australia. Thinning reduced leaf are...

Positive feedbacks in drivers of degradation can cause threshold responses in natural ecosystems. Though threshold responses have received much attention in studies of aquatic ecosystems, they have been neglected in terrestrial systems, such as forests, where the long time-scales required for monitoring have impeded research. In this study we explored the role of positive feedbacks in a tempera...

Ecologists have long treated temperate forests as systems limited by nitrogen (N) availability. Widespread concern about the effects of anthropogenic N on forested ecosystems has inspired experimental simulation of the effects of chronic N addition. This study investigates the effects of 8 years (1996–2003) of simulated chronic N deposition on tree growth and mortality in an upland mixed-oak fo...

SHELTON, M. Cl. AND M. D. CAIN (USDA Forest Service, Southern Research Station, Monticello, AR 716563516). Structure and short-term dynamics of the tree component of a mature pine-oak forest in southeastern Arkansas. J. Torrey Bot. Sot. 126:32-48. 1999.-The R.R. Reynolds Research Natural Area is a 32.ha secondgrowth forest with little human intervention for nearly 60 years. In this paper, we ch...

The Ti1 afferent neurons are the first cells to undergo axonogenesis in embryonic grasshopper limbs. The Ti1 growth cones migrate between the limb epithelium and its basal lamina. We have investigated the nature of growth conebasal lamina interactions in vivo by removing the basal lamina with mild enzymatic digestion. Treatment with elastase, ficin, or papain removes the basal lamina when viewe...