Comment diagnostiquer la photosynthèse chez les plantes ?

On évalue la production d'oxygène et l'absorption de CO2 en conditions contrôlées.

Quels tests pour mesurer la transpiration des plantes ?

On utilise des pots de pesée pour mesurer la perte d'eau par évaporation.

Comment évaluer la respiration des plantes ?

On mesure la consommation d'oxygène et la production de CO2 dans un environnement fermé.

Quels indicateurs de stress hydrique chez les plantes ?

On observe le flétrissement, la décoloration des feuilles et la chute prématurée des fleurs.

Comment détecter la photosensibilité des plantes ?

On observe les mouvements des feuilles et la direction de croissance en fonction de la lumière.

Quels symptômes d'une carence en azote chez les plantes ?

Les feuilles jaunissent et se dessèchent, surtout les plus anciennes.

Comment reconnaître une carence en potassium ?

Les feuilles présentent des bords bruns et des taches nécrotiques.

Quels signes d'excès d'eau chez les plantes ?

Les racines pourrissent, les feuilles jaunissent et la plante flétrit.

Quels symptômes d'une carence en phosphore ?

Les plantes montrent un retard de croissance et des feuilles violettes.

Comment identifier un stress thermique chez les plantes ?

Les feuilles se recroquevillent, et la croissance est ralentie.

Comment prévenir les carences en nutriments ?

Utiliser des engrais équilibrés et effectuer des analyses de sol régulières.

Quelles pratiques pour éviter le stress hydrique ?

Installer un système d'irrigation et mulcher le sol pour conserver l'humidité.

Comment prévenir les maladies des plantes ?

Assurer une bonne circulation de l'air et éviter l'humidité excessive.

Quelles mesures pour éviter l'excès d'eau ?

Utiliser des pots avec drainage et éviter les arrosages excessifs.

Comment prévenir le stress thermique ?

Fournir de l'ombre et arroser les plantes pendant les périodes chaudes.

Comment traiter une carence en nutriments ?

Appliquer des engrais spécifiques selon le nutriment manquant.

Quelles solutions pour le stress hydrique ?

Augmenter l'arrosage et améliorer le drainage du sol.

Comment remédier à un excès d'eau ?

Réduire l'arrosage et améliorer l'aération du sol.

Quelles méthodes pour améliorer la photosynthèse ?

Optimiser l'éclairage et la concentration de CO2 dans l'environnement.

Comment traiter les maladies fongiques des plantes ?

Utiliser des fongicides appropriés et retirer les parties infectées.

Quelles complications d'une carence en azote ?

Peut entraîner un retard de croissance et une faible production de fruits.

Quels risques d'un excès d'eau ?

Peut provoquer la pourriture des racines et la mort de la plante.

Quelles complications d'un stress hydrique prolongé ?

Peut entraîner la défoliation et la mort des plantes.

Quels effets d'une carence en phosphore ?

Peut réduire la floraison et la fructification des plantes.

Quelles complications d'un stress thermique ?

Peut causer des brûlures foliaires et un affaiblissement général.

Quels facteurs augmentent le risque de carences ?

Un sol pauvre, une mauvaise gestion de l'eau et un manque d'engrais.

Comment le climat influence-t-il la photosynthèse ?

Des températures extrêmes et un manque de lumière peuvent réduire la photosynthèse.

Quels facteurs augmentent le stress hydrique ?

Des périodes de sécheresse prolongées et un sol mal drainé augmentent le stress.

Comment la pollution affecte-t-elle les plantes ?

La pollution de l'air et du sol peut nuire à la croissance et à la santé des plantes.

Quels facteurs de risque pour les maladies fongiques ?

L'humidité élevée et le manque de circulation d'air favorisent les maladies fongiques.

Phénomènes physiologiques des plantes - Informations médicales vérifiées

Artificial intelligence system for automated landmark localization and analysis of cephalometry.

01 Jan 2023

DOI: 10.1259/dmfr.20220081 PMID: 36279185

Cephalometric analysis is essential for diagnosis, treatment planning and outcome assessment of orthodontics and orthognathic surgery. Utilizing artificial intelligence (AI) to achieve automated landm... A robust and clinically applicable AI system was proposed for automatic cephalometric analysis. First, 9870 cephalograms taken by different radiography machines with various malocclusions of patients ... The average landmark prediction error of this system was as low as 0.94 ± 0.74 mm and the system achieved an average classification accuracy of 89.33%.... An automatic cephalometric analysis system based on convolutional neural network was proposed, which can realize automatic landmark location and cephalometric measurements classification. This system ...

Humans Artificial Intelligence Cephalometry Neural Networks, Computer Radiography +1 autres

An MRI-only Three-dimensional Cephalometry Protocol based on the Integrated and Modular Architecture of the Human Head.

06 Nov 2023

DOI: 10.2174/0115734056258953231026094236 PMID: 37936443

Currently, three-dimensional cephalometry measurements are mainly based on cone beam computed tomography (CBCT), which has limitations of ionizing radiation, lack of soft tissue information, and lack ... This study investigated magnetic resonance imaging (MRI)-only based 3D cephalometry measurement based on the integrated and modular characteristics of the human head.... Double U-Net CycleGAN was used for CT image synthesis from MRI. This method enabled the synthesis of a CT-like image from MRI and measurements were made using 3D slicer registration and fusion.... A protocol for generating and optimizing MRI-based synthetic CT was described and found to meet the precision requirements of 3D head measurement using MRI midline positioning methods reported in neur... The reported method provided a new protocol for MRI-only cephalometric analysis of craniofacial growth and development, malformation occurrence, treatment planning, and outcomes....

Cross Sectional Analysis of Eurasian Skull Anatomy for 3D Cephalometry-Normative Data Reveal Four Different Skull Types.

19 Jun 2023

DOI: 10.3390/jpm13061018 PMID: 37374007

The unsolved problem in three-dimensional surgical planning for patients with facial deformity, dysgnathia, or asymmetry is the lack of a normative database of "norm skulls" that can be used as treatm...

Validation of 'total face approach' (TFA) three-dimensional cephalometry for the diagnosis of dentofacial dysmorphisms and correlation with clinical diagnosis.

10 Oct 2024

DOI: 10.1016/j.ijom.2024.10.002 PMID: 39394003

The last decades have witnessed significant improvements in orthognathic surgery, but a true standardization of cephalometric analysis to guide clinical assessment in three-dimensional (3D) virtual pl...

Appraising mandibular prognathism in class III malocclusion following orthognathic surgery: Patient-reported and cephalometry-based outcomes.

06 May 2024

DOI: 10.1016/j.jcms.2024.04.013 PMID: 39034196

Patients with class III malocclusion often exhibit mandibular prognathism and complain of "prognathic appearance". The overall positive effects of orthognathic surgery on facial appearance have been d...

Correlation of Clivus Length and Angle with Chronological Age, Gender, Sagittal Growth Pattern of the Jaws, and Skeletal Maturation Using Lateral Cephalometry.

Sep 2024

DOI: 10.30476/dentjods.2023.98275.2065 PMID: 39371958

Determination of remaining growth potential of patients is the most important factor in orthodontic treatment.... This study aimed to assess the correlation of clivus length and angle with age, gender, sagittal growth pattern of the jaws, and skeletal maturation using lateral cephalometry.... This cross-sectional study was conducted on 390 lateral cephalograms (Vatech, paX-i3D Green, South Korea) of patients aged 6 to 25 years. The patients were assigned to three groups of skeletal class I... Clivus length had a significant correlation with SNA (r= 0.103,... All parameters were greater in males, and increased with age (except Welcher angle). Clivus length and angle had significant correlations with position of both jaws but not with sagittal relationship....

Divergence between CBCT and Optical Scans for Soft Tissue Analysis and Cephalometry in Facial Imaging: A cross-sectional study on healthy adults.

12 Feb 2024

DOI: 10.1016/j.ortho.2024.100845 PMID: 38350255

Facial soft tissue analysis is becoming increasingly emphasized in orthodontic diagnosis and treatment planning. While traditional cephalometry primarily focuses on hard tissues, recent non-invasive i... A cross-sectional study was conducted from January 2020 to May 2023. CBCT and 3D facial scans were obtained simultaneously using a specialized imaging system. Reproducible landmark points were selecte... Comparisons between 10 CBCT-derived and 10 facial scan-based soft tissue representations resulted into 1.8mm mean root median square (RMS). Angular measurements, such as ANB, right gonial angle, and l... Facial soft tissue analysis using either 3D facial scans or CBCT-derived offers similar results for orthodontic diagnosis and treatment planning. These findings support the use of non-invasive diagnos...

Cephalic index and horizontal point of maximum width in children with normal brain development in China.

29 Oct 2024

DOI: 10.1186/s12887-024-05173-4 PMID: 39472870

To identify the normal range and distribution in the cephalic index(CI) and horizontal point of maximum width(H-PMW) of Chinese children with normal brain development.... We retrospectively analyzed Chinese Han children who visited our hospitals between June 2015 and June 2020 because of headache or suspected head injuries. 456 children (257 males, 199 females; aged 0-... The overall mean CI was 86.6 ± 5.2. The mean CI for males was 87.0 ± 5.1, and that for females was 86.0 ± 5.2. The overall mean H-PMW was 53.7 ± 2.4. The mean H-PMW for males was 53.8 ± 2.5, and that ... The CI and H-PMW values of Chinese normal children reported in this study will provide a valuable reference to diagnose cranial deformities, assess the severity of the disease and the effectiveness of...

Humans Male Female Child Child, Preschool +9 autres

Comparative evaluation of commercially available AI-based cephalometric tracing programs.

18 Oct 2024

DOI: 10.1186/s12903-024-05032-9 PMID: 39425100

Compare the accuracy and diagnostic concordance of three commercially available AI-based lateral cephalometric tracing software.... Sixty-three lateral cephalometric radiographs were analyzed using semi-automatic (Dolphin Imaging Systems LLC) and AI-based software programs (WebCeph™, Cephio, and Ceppro DDH Inc.). Intra- and inter-... Human expert reliability was excellent (ICC > 0.9) for most cephalometric parameters. Compared to human experts, significant differences were observed for all three AI-based cephalometric programs (We... All three AI-based tracing programs showed inaccuracies compared to human expert measurements and lacked reliability in measuring key cephalometric parameters. Clinicians should exercise caution when ...

Humans Cephalometry Software Reproducibility of Results Observer Variation +6 autres

Upper airways changes associated with orthodontic molar distalization by Pendulum appliance in adolescent patients: a multicenter retrospective cephalometric study.

16 Oct 2024

DOI: 10.1186/s13005-024-00461-x PMID: 39415201

The purpose of this multicenter retrospective study was to perform a two-dimensional analysis of upper airway changes in adolescent patients following molar distalization with the Pendulum appliance.... The study involved the cephalometric analysis of 88 patients, retrospectively categorized into two groups: skeletal Class II with a dental Class II molar relationship (36 patients, mean age 12.6 ± 1.1... Statistically significant differences were observed in the skeletal measurements that characterized both groups, particularly in ANB and Wits appraisal, at T0 (P < 0.001). After molar distalization, C... The Pendulum appliance does not significantly change the upper airway dimensions in Class I and Class II malocclusion patients, thereby minimizing potential respiratory risks....

Humans Retrospective Studies Female Male Cephalometry +5 autres

Phénomènes physiologiques des plantes : Questions médicales fréquentes

Termes MeSH sélectionnés :

Questions fréquentes et termes MeSH associés

Diagnostic 5

Symptômes 5

Prévention 5

Traitements 5

Complications 5

Facteurs de risque 5

Contenu validé par Dr Olivier Menir

Sous-catégories

Résistance à la sécheresse

Gamétogenèse de plante

Perception de la gravité

Organogenèse des plantes

Parthénogenèse

Photosynthèse

Défense des plantes contre les herbivores

Développement des plantes

Maladies des plantes

Dispersion des plantes

Immunité des plantes

Stérilité des plantes

Nodulation racinaire

Techniques d'embryogenèse somatique végétale

Transpiration des plantes

Pollinisation

Dispersion des graines

Autofécondation

Auto-incompatibilité chez les plantes à fleurs

Tropisme

Apomixie

Métabolisme acide crassulacéen

Photophosphorylation

Étiolement

Germination

Sénescence des plantes

Maladie à phytoplasme

Nécrose et chlorose des plantes

Tumeurs végétales

Résistance à la maladie

Résistance systémique induite des plantes

Gravitropisme

Phototropisme

Dormance des plantes

Auteurs principaux

Sources (486 au total)