RESUMO
The effects of iron deficiency and NO3- stress on the growth and the iron absorption cha-racteristic of tomato seedlings were investigated under suboptimal temperature (18 â/12 â (day/night)). The results indicated that the growth was significantly inhibited under suboptimal temperature compared with appropriate temperature treatment; the plant heights, leaf areas and dry matter accumulations were markedly decreased. The effects of iron deficiency under suboptimal temperature on the growth of tomato seedlings were larger than that of under appropriate temperature treatments. Under suboptimal temperature, the plant heights of tomato seedlings in iron deficiency and/or NO3- stress treatments were not significantly different from no stress treatment, but leaf areas and leaf chlorophyll content of tomato seedlings were decreased obviously. The leaf electrolytic leakage, root activity and Fe3+ reductase activity of tomato seedlings were markedly increased under suboptimal temperature, but chlorophyll content, total root length, root surface area, root tip number and root volume were obviously reduced. The iron contents in roots, stems and leaves of tomato seedlings were also remarkably decreased. The NO3- stress and the combined stress of iron deficiency and NO3- stress under suboptimal temperature aggravated the reduction of dry matter, leaf electrolytic leakage and the inhibition of iron ion absorption in tomato seedlings. The iron ion absorption showed the antagonistic impact on the absorption of potassium and calcium ion, but showed different effects among different organs. The iron deficiency symptom of tomato seedlings was aggravated by reducing the concentration of iron ion in the nutrient solution.
Assuntos
Deficiências de Ferro , Plântula , Solanum lycopersicum , Folhas de Planta , Raízes de Plantas , TemperaturaRESUMO
<p><b>OBJECTIVE</b>To retrospectively study the clinical effects of eardrum flap area on the healing outcome following traumatic perforation.</p><p><b>METHODS</b>Totally 291 traumatic eardrum perforations with in-/everted edges were included in this study. They were randomly divided into three groups and received conservative treatment, epidermal growth factor (EGF) via Gelfoam patching, or edge-approximation plus Gelfoam patching respectively. Patients in each group were further divided into two subgroups according to the eardrum flap area less than or equal to 1/2 or >1/2 of the perforation size. The healing rate and mean closure time after tympanic membrane perforation were evaluated at three months.</p><p><b>RESULTS</b>Of the total 291 participants, 281 were included in the final statistical analysis. The area of curled edge did not affect the healing outcome significantly in any groups (P>0.05). The healing rate varied slightly: 90.7% vs 92.3% in spontaneous healing group, 98.2% vs 97.4% in EGF via Gelfoam patching group, and 96.5% vs 100% in edge-approximation plus Gelfoam patching group. In addition, in all groups the area of curled edge did not affect the mean closure time significantly (P>0.05). The closure time was (32.3+/-2.4) d vs (30.6+/-3.1) d in sponaneous healing group, (13.4+/-2.5) d vs (13.1+/-1.9) d in EGF via Gelfoam patching group, and (11.9+/-3.1) d vs (12.2+/-2.1) d in edge-approximation plus Gelfoam patching group.</p><p><b>CONCLUSION</b>The eardrum flap area of traumatic eardrum perforation does not significantly affect the clinical outcomes.</p>
