Further work using the NT2.N/A model and a broader array of toxicants is appropriate in order to confirm the applicability of these methods.”
“The adaptive significance of leaf longevity has been established in relation to restrictive nutrients that can be retranslocated within the plant. However, the effect of deficiencies in ‘non-mobile’ nutrients on leaf lifespan and photosynthetic
carbon gain is uncertain. Calcium is frequently given as an example of an essential nutrient with low phloem mobility that may alter the leaf senescence process. This study has been designed to estimate leaf lifespan, leaf production (L(p)) and leaf death (L(d)) rates, the age structure of leaves, and the decline in maximum photosynthetic CX-6258 manufacturer rate (A(max)) with age in plants of Ipomoea pes-caprae growing with a full supply of nutrients and with a low Ca supply. The Ca deficiency produced reductions in L(p) and leaf lifespan compared with control plants. In spite of the differences in the demographic parameters between treatments in control and low-Ca plants, the percentage of leaves of a given leaf age class is maintained in such a way that the number of leaves per plant continues to increase. No relationship was found between Ca supply and A(max). However, Staurosporine inhibitor the decline in A(max) with leaf senescence was rather sudden
in control plants compared with plants growing with a low Ca supply. The importance of simultaneously using the total leaf demographic census and the assimilation rate along with leaf lifespan data in order to understand the performance
TPCA-1 of whole plants under constrained conditions is discussed.”
“Study Design. A prospective left-right comparison designed experiment using a rabbit posterolateral inter-transverse process fusion model.
Objective. To investigate the involvement of calcitonin gene-related peptide (CGRP) innervation in the promoting effect of low intensity pulsed ultrasound stimulation (LIPUS) on spinal fusion without decortication.
Summary of Background Data. Sensory neuropeptide CGRP is involved in bone repair and ectopic ossification. Comparison of CGRP innervations in ectopic bone between sham LIPUS and LIPUS sides can help us to understand the relationship between sensory nerve innervation and LIPUS.
Methods. A total of 27 New Zealand white rabbits underwent bilateral posterolateral inter-transverse process fusion with implantation of porous poly-D, L-lactic acid blocks loaded with 1.25 mu g recombinant human bone morphogenetic protein-4 solution. One side was provided LIPUS daily whereas the other side served as control. Animals were killed and the operated lumbar vertebrae were harvested for histomorphologic evaluation at 3 days (n = 3), 1 week (n = 6), 3 weeks (n = 6), 7 weeks (n = 6), and 12 weeks (n = 6) following surgery, respectively.
Results. LIPUS accelerated the invasion of CGRP-positive nerve fibers during ectopic ossification spatially and temporally.