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

The effects of sleep disordered breathing on sleep spindle activity in children and the relationship with sleep, behavior and neurocognition.

01 2023

DOI: 10.1016/j.sleep.2022.11.028 PMID: 36521367

Obstructive sleep disordered breathing (SDB), has adverse neurocognitive and behavioral sequelae in children, despite conventional measures of sleep disruption being unaffected. There is growing evide... Children 3-12 years old referred for clinical assessment of SDB and age matched control children from the community were recruited and underwent polysomnography. Sleep spindles were identified manuall... Children were grouped into control, Primary Snoring, Mild OSA and Moderate/severe OSA, N = 10/group. All measures of spindle activity were lower in the SDB groups compared to the Control children and ... The reduced spindle activity observed in the children with SDB, particularly Mild OSA, indicates that sleep micro-architecture is disrupted and that this disruption may underpin the negative effects o...

Child Humans Child, Preschool Sleep Apnea Syndromes Sleep +3 autres

Clinical phenotypes of obstructive sleep apnea: a cluster analysis based on sleep perception and sleep quality.

10 2023

DOI: 10.1007/s11325-023-02786-4 PMID: 36853471

To determine obstructive sleep apnea (OSA) phenotypes using cluster analysis including variables of sleep perception and sleep quality and to further explore factors correlated with poor sleep quality... This retrospective study included patients with OSA undergoing polysomnography (PSG) between December 2020 and April 2022. Two-step cluster analysis was performed to detect distinct clusters using sle... A total of 1118 patients were included (81.6% men) with mean age ± SD 43.3 ± 13.1 years, Epworth sleepiness score, 5.7 ± 4.4, and insomnia severity index 3.0 ± 2.4. Five distinct OSA clusters were ide... Subgroups of patients with OSA have different patterns of sleep perception and quality that may help us to further understand the characteristics of sleep perception in OSA and provide clues for perso...

Male Humans Female Sleep Quality Retrospective Studies +6 autres

The Comparison of the Sleep Structure and Sleep Spindle Activity in Children With Primary Snoring and Sleep-Disordered Breathing.

Jun 2023

DOI: 10.1177/00099228221139985 PMID: 36433642

Obstructive sleep apnea syndrome (OSAS) in children is associated with changes in the structure of sleep. The possible effects of snoring on spindle activity have not been established. We analyzed the...

Child Humans Snoring Sleep Apnea Syndromes Sleep +2 autres

SLeep Education for Everyone Program (SLEEP) Results in Sustained Improvements in Sleep Outcomes at Six Months.

03 09 2023

DOI: 10.1080/15402002.2022.2146693 PMID: 36377788

Community-delivered sleep education interventions have been demonstrated to be effective in improving sleep outcomes, but whether these benefits persist once the program ends is not well characterized... Nineteen participants were surveyed three times: at baseline, program completion (six weeks), and the six-month post-program timepoint. Sleep outcomes for quality, duration, insomnia symptoms, sleep h... Longitudinal models adjusted for baseline sleep problems revealed the benefits achieved immediately after the program were retained at six months for sleep quality (estimate: -2.0 (95%CI: -2.7, -1.3))... These results suggest that a community-delivered sleep education intervention can produce sustained benefits for participants and should be considered as a tool to address uncomplicated sleep issues....

Humans Aged Sleep Initiation and Maintenance Disorders Sleep Surveys and Questionnaires +2 autres

Sleep electroencephalography biomarkers of cognition in obstructive sleep apnea.

10 2023

DOI: 10.1111/jsr.13831 PMID: 36941194

Obstructive sleep apnea has been associated with cognitive impairment and may be linked to disorders of cognitive function. These associations may be a result of intermittent hypoxaemia, sleep fragmen...

Humans Sleep Sleep Apnea, Obstructive Cognition Electroencephalography +1 autres

Sleep architecture and sleep-disordered breathing in fatal insomnia.

12 2022

DOI: 10.1016/j.sleep.2022.08.027 PMID: 36182725

Fatal insomnia (FI) is a rare prion disease severely affecting sleep architecture. Breathing during sleep has not been systematically assessed. Our aim was to characterize the sleep architecture, resp... Eleven consecutive FI patients (ten familial, one sporadic) were examined with video-polysomnography (vPSG) between 2002 and 2017. Wake/sleep stages and respiration were evaluated using a modified sco... Median age at onset was 48 years and survival after vPSG was 1 year. All patients had different combinations of breathing disturbances including increased respiratory rate variability (RRV; n = 7), st... FI patients show frequent breathing alterations, associated with respiratory nuclei damage, and, in addition to NREM sleep distortion, have severe impairment of REM sleep, related with raphe nuclei de...

Humans Sleep Initiation and Maintenance Disorders Polysomnography Sleep Sleep, REM +1 autres

Circadian Rhythm Genes and Their Association with Sleep and Sleep Restriction.

27 Sep 2024

DOI: 10.3390/ijms251910445 PMID: 39408776

Deprivation of sleep (DS) and its effects on circadian rhythm gene expression are not well understood despite their influence on various physiological and psychological processes. This study aimed to ...

Humans Male Circadian Rhythm Female Sleep +9 autres

The risk of sleep-related death in an inclined sleep environment.

12 Aug 2024

DOI: 10.1186/s12889-024-19731-z PMID: 39135049

Unsafe sleep environments are the primary modifiable risk factor for sudden unexpected infant death (SUID). Despite this knowledge, products that deviate from the American Academy of Pediatrics (AAP) ... A case-control analysis using publicly available and previously published survey data was conducted for SUID events occurring between January 1, 2018 and April 12, 2019 (the date of the first inclined... During the study period, 4,900,573 births and 4,363 SUID deaths occurred in the US. Control characteristics were similar between previous night users of an AAP-recommended sleep environment (24%) and ... This novel analysis fills a longstanding gap in risk assessments of inclined infant sleep products. More timely risk analyses may improve the safety of the marketplace....

Humans Sudden Infant Death Infant Case-Control Studies Sleep +6 autres

Sleeping Difficulties, Sleep Duration, and Risk of Hypertension in Women.

11 2023

DOI: 10.1161/HYPERTENSIONAHA.123.21350 PMID: 37721046

Rates of poor sleep and hypertension are alarming worldwide. In this study, we investigate the association between sleeping difficulties and sleep duration with hypertension risk in women.... Sixty-six thousand one hundred twenty-two participants of the Nurses' Health Study 2, who were free of hypertension at baseline (2001), were followed prospectively for 16 years and incident hypertensi... During follow-up, we documented 25 987 incident cases of hypertension. After controlling for demographic and lifestyle risk factors, compared with women who slept 7 to 8 hours, women with shorter slee... Difficulty falling or staying asleep and short sleep duration were associated with higher risk of hypertension among women in our study. Screening for poor sleep could be useful in identifying people ...

Humans Female Sleep Duration Cohort Studies Sleep Initiation and Maintenance Disorders +4 autres

Sleep duration, weekend catch-up sleep, and risk of obstructive sleep apnea in relation to handgrip strength.

07 2023

DOI: 10.1016/j.archger.2023.104987 PMID: 36889010

This cross-sectional study aimed to evaluate whether weekday sleep duration, weekend catch-up sleep, and risk of obstructive sleep apnea are individually and in combination associated with handgrip st... Data from the Korea National Health and Nutrition Examination Survey 2019, including weekday sleep duration, weekend catch-up sleep, STOP-BANG scores, relative handgrip strength (handgrip strength div... After adjusting for other sleep parameters and confounding variables, each adequate sleep parameter individually and collectively was associated with high relative handgrip strength (adjusted odds rat... Adequate weekday sleep duration, weekend catch-up sleep, and low obstructive sleep apnea risk were individually and in combination associated with high handgrip strength....

Male Female Humans Sleep Duration Nutrition Surveys +4 autres

Phénomènes physiologiques des plantes : Questions médicales fréquentes

Termes MeSH sélectionnés :

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

Sources (10000 au total)