Walaa Adra | Université de Grenoble (original) (raw)
Papers by Walaa Adra
Medicinal Plants - International Journal of Phytomedicines and Related Industries, Dec 31, 2022
Dans le contexte du changement global et de la perte de la biodiversité, la prise en compte de ce... more Dans le contexte du changement global et de la perte de la biodiversité, la prise en compte de cette dernière dans la gestion forestière reste encore très générale. Les démarches ne sont pas encore opérationnelles alors que les gestionnaires ont besoin d'outils destinés directement à la planification. Ainsi, il est devenu urgent d'améliorer les approches d'évaluation et de suivi de la biodiversité et de développer un cadre conceptuel à partir des indicateurs biologiques qui puisse servir dans la prise des décisions. Ce travail se repose sur une approche associant l'enjeu de conservation d'une espèce sauvage patrimoniale dans un paysage de montagne à la maîtrise d'une gestion forestière qui détermine la qualité de son habitat. Dans le cadre concret de la gestion forestière d'un Parc Naturel Régional où les enjeux sont multiples (écologiques, économiques, touristiques), les acteurs concernés s'interrogent moins sur le « comment gérer » que sur le « où g...
Medicinal Plants - International Journal of Phytomedicines and Related Industries, 2020
The new coronavirus (Covid-19) is affecting 210 countries and territories around the world. Till ... more The new coronavirus (Covid-19) is affecting 210 countries and territories around the world. Till now there is no specific treatment, and vaccine development is in progress. While corona pandemic draws the world's attention to the vaccine, also it reminds for the importance of immunization that can help us fight against the novel virus. Good health and psychological alertness has been proven to increase human body immune response and thus enhancing resistance towards disease. Aromatherapy is considered as one of the complementary medical approach involves the therapeutic use of essential oils, that may lead to viable options for fighting this disease. This review highlighted on some psychological features related to this virus and how practicing aromatherapy could help us to control or minimize the percussions of Covid-19.
Journal of Biodiversity & Endangered Species, 2013
Landscape structure is a key factor for biodiversity conservation. We assessed the potential role... more Landscape structure is a key factor for biodiversity conservation. We assessed the potential role of landscaperelated habitat structure on Hazel Grouse (Tetrastesbonasia) by recording the occurrence of the species. Hazel Grouse is a widely recognized endangered species, because of the habitat loss as a direct consequence of land use change that is jeopardizing the species survival. The aim of this study is to provide a method based on habitat suitability modelling to explore and analyse hazel grouse-landscape structure and its relation to key habitat features. We evaluated landscape factors and critical threshold for monitoring the species, in order to assess the predictive power of models based on field surveys, ancillary information and high resolution infrared aerial photographs. We tested Maximum Entropy (MaxEnt) algorithm, in order to predict the distribution of Hazel Grouse species, in the complex mountain landscape within the study site. This presence-only modelling method has showed numerous advantages over many other approaches. It is based on a function that links the fitness of individuals to their environment. Our results were highly consistent with field knowledge, showing that habitat modelling generated using spatial statistics and GIS can effectively help in the characterization of habitat requirements and the localization of the species suitable habitat. We found also that key drivers of Hazel Grouse distribution are not only environmental factors, in particular linked to elevation in mountain areas, but also landscape heterogeneity is a key feature. Hence, conservation of this species will require land management practices that maintain heterogeneous landscape; in particular small forest openings are essential for the species. The approach developed seem to be a promising operational tool for local and regional managers interested in species monitoring and management within the long term.
Dans le contexte du changement global et de la perte de la biodiversite, la prise en compte de ce... more Dans le contexte du changement global et de la perte de la biodiversite, la prise en compte de cette derniere dans la gestion forestiere reste encore tres generale. Les demarches ne sont pas encore operationnelles alors que les gestionnaires ont besoin d'outils destines directement a la planification. Ainsi, il est devenu urgent d'ameliorer les approches d'evaluation et de suivi de la biodiversite et de developper un cadre conceptuel a partir des indicateurs biologiques qui puisse servir dans la prise des decisions. Ce travail se repose sur une approche associant l'enjeu de conservation d'une espece sauvage patrimoniale dans un paysage de montagne a la maitrise d'une gestion forestiere qui determine la qualite de son habitat. Dans le cadre concret de la gestion forestiere d'un Parc Naturel Regional ou les enjeux sont multiples (ecologiques, economiques, touristiques), les acteurs concernes s'interrogent moins sur le « comment gerer » que sur le « ou g...
Journal of Chemical and Pharmaceutical Sciences, Nov 27, 2021
Since ancient times, humans have used aromatic plants and their extracts for religious rituals, p... more Since ancient times, humans have used aromatic plants and their extracts for religious rituals, perfumery, cosmetics, food manufacture and preservation, as well as for aromatherapy, disease control and for making medicinal drugs, which are needed nowadays in pharmaceutical industry. Essential oils, are essence extracted from the plant or from some of its parts, it could be defined as natural metabolic secretions that has not yet fully understood. It can also be considered as real plant hormones gives it an aromatic smell characterized by its strong concentration and easy volatilization as it evaporates completely without leaving a greasy trace behind it, these oils are extracted in different extraction methods.
Essential oils have been used as an alternative medicine since Twelfth century, and became more widespread in the second half of the Sixteenth century. This has allowed modern chemistry to adopt a scientific approach in using it, which gave many publications and research during the Nineteenth and Twentieth century. As they have been proven to be good sources of biologically active compounds with medicinal properties, such as reducing fever, treating digestive and respiratory disorders and strengthening the immune system, in addition to its impact on anxiety and depression.
This review paper is highlighting on some essential oils extracted from its medicinal plants and the methods of its extraction including the chemical structure of its most important components that give the therapeutic properties reflecting on general health and safety.
KEY WORDS: Medicinal plants, Essential oils, Chemical components, Medicinal properties, Oil extraction.
ABSTRUCT The new coronavirus (Covid-19) is affecting 210 countries and territories around the wor... more ABSTRUCT The new coronavirus (Covid-19) is affecting 210 countries and territories around the world. Till now there is no specific treatment, and vaccine development is in progress. While corona pandemic draws the world's attention to the vaccine, also it reminds for the importance of immunization that can help us fight against the novel virus. Good health and psychological alertness has been proven to increase human body immune response and thus enhancing resistance towards disease. Aromatherapy is considered as one of the complementary medical approach involves the therapeutic use of essential oils, that may lead to viable options for fighting this disease. This review highlighted on some psychological features related to this virus and how practicing aromatherapy could help us to control or minimize the percussions of Covid-19.
Cemagref, UR EMAX Ecosyste`mes me´diterrane´ens et Risques, 3275 route Ce´zanne -CS 40061 -13182 ... more Cemagref, UR EMAX Ecosyste`mes me´diterrane´ens et Risques, 3275 route Ce´zanne -CS 40061 -13182 Aix-en-Provence cedex 5, France A B S T R A C T Regeneration by seeds for cork oak (Quercus suber) and companion oaks (holm oak Quercus ilex and downy oak Quercus pubescens) is likely to be poor in the fire-prone Maures massif (southern France) but the causes are poorly known. Our objective was to assess the effective recruitment for these three oak species and their temporal pattern of recruitment, in order to determine the main limitation factors and the regeneration window of each species. We studied oak recruits (height <3 m) in naturally regenerated populations according to a gradient of fire recurrence and in five main vegetation types including shrublands and mixed mature woodlands. Fire recurrence was the main explanatory factor of oak recruitment, either directly or through vegetation type and microsite characteristics. The results indicate nil to low recruitment for holm oak and downy oak in shrublands, especially those recurrently burned and dominated by Cistus species. Cork oak recruited better than the other oaks in medium and high shrublands dominated by Erica arborea. In contrast, recruitment was high for holm and downy oak in mixed oak stands and mixed pine-oak stands that have not burned for decades. Microsite conditions such as coverage by litter and shrubs influenced oak recruitment, whereas landscape configuration and stand basal area had no influence. Our results suggest that strategic shrub-clearing, oak planting and protection of mixed oak woodlands as seed sources would help maintaining oak populations in the woodland-shrubland mosaic.
Landscape structure is a key factor for biodiversity conservation. We assessed the potential role... more Landscape structure is a key factor for biodiversity conservation. We assessed the potential role of landscaperelated habitat structure on Hazel Grouse (Tetrastesbonasia) by recording the occurrence of the species. Hazel Grouse is a widely recognized endangered species, because of the habitat loss as a direct consequence of land use change that is jeopardizing the species survival. The aim of this study is to provide a method based on habitat suitability modelling to explore and analyse hazel grouse-landscape structure and its relation to key habitat features. We evaluated landscape factors and critical threshold for monitoring the species, in order to assess the predictive power of models based on field surveys, ancillary information and high resolution infrared aerial photographs. We tested Maximum Entropy (MaxEnt) algorithm, in order to predict the distribution of Hazel Grouse species, in the complex mountain landscape within the study site. This presence-only modelling method has showed numerous advantages over many other approaches. It is based on a function that links the fitness of individuals to their environment. Our results were highly consistent with field knowledge, showing that habitat modelling generated using spatial statistics and GIS can effectively help in the characterization of habitat requirements and the localization of the species suitable habitat. We found also that key drivers of Hazel Grouse distribution are not only environmental factors, in particular linked to elevation in mountain areas, but also landscape heterogeneity is a key feature. Hence, conservation of this species will require land management practices that maintain heterogeneous landscape; in particular small forest openings are essential for the species. The approach developed seem to be a promising operational tool for local and regional managers interested in species monitoring and management within the long term.
Medicinal Plants - International Journal of Phytomedicines and Related Industries, Dec 31, 2022
Dans le contexte du changement global et de la perte de la biodiversité, la prise en compte de ce... more Dans le contexte du changement global et de la perte de la biodiversité, la prise en compte de cette dernière dans la gestion forestière reste encore très générale. Les démarches ne sont pas encore opérationnelles alors que les gestionnaires ont besoin d'outils destinés directement à la planification. Ainsi, il est devenu urgent d'améliorer les approches d'évaluation et de suivi de la biodiversité et de développer un cadre conceptuel à partir des indicateurs biologiques qui puisse servir dans la prise des décisions. Ce travail se repose sur une approche associant l'enjeu de conservation d'une espèce sauvage patrimoniale dans un paysage de montagne à la maîtrise d'une gestion forestière qui détermine la qualité de son habitat. Dans le cadre concret de la gestion forestière d'un Parc Naturel Régional où les enjeux sont multiples (écologiques, économiques, touristiques), les acteurs concernés s'interrogent moins sur le « comment gérer » que sur le « où g...
Medicinal Plants - International Journal of Phytomedicines and Related Industries, 2020
The new coronavirus (Covid-19) is affecting 210 countries and territories around the world. Till ... more The new coronavirus (Covid-19) is affecting 210 countries and territories around the world. Till now there is no specific treatment, and vaccine development is in progress. While corona pandemic draws the world's attention to the vaccine, also it reminds for the importance of immunization that can help us fight against the novel virus. Good health and psychological alertness has been proven to increase human body immune response and thus enhancing resistance towards disease. Aromatherapy is considered as one of the complementary medical approach involves the therapeutic use of essential oils, that may lead to viable options for fighting this disease. This review highlighted on some psychological features related to this virus and how practicing aromatherapy could help us to control or minimize the percussions of Covid-19.
Journal of Biodiversity & Endangered Species, 2013
Landscape structure is a key factor for biodiversity conservation. We assessed the potential role... more Landscape structure is a key factor for biodiversity conservation. We assessed the potential role of landscaperelated habitat structure on Hazel Grouse (Tetrastesbonasia) by recording the occurrence of the species. Hazel Grouse is a widely recognized endangered species, because of the habitat loss as a direct consequence of land use change that is jeopardizing the species survival. The aim of this study is to provide a method based on habitat suitability modelling to explore and analyse hazel grouse-landscape structure and its relation to key habitat features. We evaluated landscape factors and critical threshold for monitoring the species, in order to assess the predictive power of models based on field surveys, ancillary information and high resolution infrared aerial photographs. We tested Maximum Entropy (MaxEnt) algorithm, in order to predict the distribution of Hazel Grouse species, in the complex mountain landscape within the study site. This presence-only modelling method has showed numerous advantages over many other approaches. It is based on a function that links the fitness of individuals to their environment. Our results were highly consistent with field knowledge, showing that habitat modelling generated using spatial statistics and GIS can effectively help in the characterization of habitat requirements and the localization of the species suitable habitat. We found also that key drivers of Hazel Grouse distribution are not only environmental factors, in particular linked to elevation in mountain areas, but also landscape heterogeneity is a key feature. Hence, conservation of this species will require land management practices that maintain heterogeneous landscape; in particular small forest openings are essential for the species. The approach developed seem to be a promising operational tool for local and regional managers interested in species monitoring and management within the long term.
Dans le contexte du changement global et de la perte de la biodiversite, la prise en compte de ce... more Dans le contexte du changement global et de la perte de la biodiversite, la prise en compte de cette derniere dans la gestion forestiere reste encore tres generale. Les demarches ne sont pas encore operationnelles alors que les gestionnaires ont besoin d'outils destines directement a la planification. Ainsi, il est devenu urgent d'ameliorer les approches d'evaluation et de suivi de la biodiversite et de developper un cadre conceptuel a partir des indicateurs biologiques qui puisse servir dans la prise des decisions. Ce travail se repose sur une approche associant l'enjeu de conservation d'une espece sauvage patrimoniale dans un paysage de montagne a la maitrise d'une gestion forestiere qui determine la qualite de son habitat. Dans le cadre concret de la gestion forestiere d'un Parc Naturel Regional ou les enjeux sont multiples (ecologiques, economiques, touristiques), les acteurs concernes s'interrogent moins sur le « comment gerer » que sur le « ou g...
Journal of Chemical and Pharmaceutical Sciences, Nov 27, 2021
Since ancient times, humans have used aromatic plants and their extracts for religious rituals, p... more Since ancient times, humans have used aromatic plants and their extracts for religious rituals, perfumery, cosmetics, food manufacture and preservation, as well as for aromatherapy, disease control and for making medicinal drugs, which are needed nowadays in pharmaceutical industry. Essential oils, are essence extracted from the plant or from some of its parts, it could be defined as natural metabolic secretions that has not yet fully understood. It can also be considered as real plant hormones gives it an aromatic smell characterized by its strong concentration and easy volatilization as it evaporates completely without leaving a greasy trace behind it, these oils are extracted in different extraction methods.
Essential oils have been used as an alternative medicine since Twelfth century, and became more widespread in the second half of the Sixteenth century. This has allowed modern chemistry to adopt a scientific approach in using it, which gave many publications and research during the Nineteenth and Twentieth century. As they have been proven to be good sources of biologically active compounds with medicinal properties, such as reducing fever, treating digestive and respiratory disorders and strengthening the immune system, in addition to its impact on anxiety and depression.
This review paper is highlighting on some essential oils extracted from its medicinal plants and the methods of its extraction including the chemical structure of its most important components that give the therapeutic properties reflecting on general health and safety.
KEY WORDS: Medicinal plants, Essential oils, Chemical components, Medicinal properties, Oil extraction.
ABSTRUCT The new coronavirus (Covid-19) is affecting 210 countries and territories around the wor... more ABSTRUCT The new coronavirus (Covid-19) is affecting 210 countries and territories around the world. Till now there is no specific treatment, and vaccine development is in progress. While corona pandemic draws the world's attention to the vaccine, also it reminds for the importance of immunization that can help us fight against the novel virus. Good health and psychological alertness has been proven to increase human body immune response and thus enhancing resistance towards disease. Aromatherapy is considered as one of the complementary medical approach involves the therapeutic use of essential oils, that may lead to viable options for fighting this disease. This review highlighted on some psychological features related to this virus and how practicing aromatherapy could help us to control or minimize the percussions of Covid-19.
Cemagref, UR EMAX Ecosyste`mes me´diterrane´ens et Risques, 3275 route Ce´zanne -CS 40061 -13182 ... more Cemagref, UR EMAX Ecosyste`mes me´diterrane´ens et Risques, 3275 route Ce´zanne -CS 40061 -13182 Aix-en-Provence cedex 5, France A B S T R A C T Regeneration by seeds for cork oak (Quercus suber) and companion oaks (holm oak Quercus ilex and downy oak Quercus pubescens) is likely to be poor in the fire-prone Maures massif (southern France) but the causes are poorly known. Our objective was to assess the effective recruitment for these three oak species and their temporal pattern of recruitment, in order to determine the main limitation factors and the regeneration window of each species. We studied oak recruits (height <3 m) in naturally regenerated populations according to a gradient of fire recurrence and in five main vegetation types including shrublands and mixed mature woodlands. Fire recurrence was the main explanatory factor of oak recruitment, either directly or through vegetation type and microsite characteristics. The results indicate nil to low recruitment for holm oak and downy oak in shrublands, especially those recurrently burned and dominated by Cistus species. Cork oak recruited better than the other oaks in medium and high shrublands dominated by Erica arborea. In contrast, recruitment was high for holm and downy oak in mixed oak stands and mixed pine-oak stands that have not burned for decades. Microsite conditions such as coverage by litter and shrubs influenced oak recruitment, whereas landscape configuration and stand basal area had no influence. Our results suggest that strategic shrub-clearing, oak planting and protection of mixed oak woodlands as seed sources would help maintaining oak populations in the woodland-shrubland mosaic.
Landscape structure is a key factor for biodiversity conservation. We assessed the potential role... more Landscape structure is a key factor for biodiversity conservation. We assessed the potential role of landscaperelated habitat structure on Hazel Grouse (Tetrastesbonasia) by recording the occurrence of the species. Hazel Grouse is a widely recognized endangered species, because of the habitat loss as a direct consequence of land use change that is jeopardizing the species survival. The aim of this study is to provide a method based on habitat suitability modelling to explore and analyse hazel grouse-landscape structure and its relation to key habitat features. We evaluated landscape factors and critical threshold for monitoring the species, in order to assess the predictive power of models based on field surveys, ancillary information and high resolution infrared aerial photographs. We tested Maximum Entropy (MaxEnt) algorithm, in order to predict the distribution of Hazel Grouse species, in the complex mountain landscape within the study site. This presence-only modelling method has showed numerous advantages over many other approaches. It is based on a function that links the fitness of individuals to their environment. Our results were highly consistent with field knowledge, showing that habitat modelling generated using spatial statistics and GIS can effectively help in the characterization of habitat requirements and the localization of the species suitable habitat. We found also that key drivers of Hazel Grouse distribution are not only environmental factors, in particular linked to elevation in mountain areas, but also landscape heterogeneity is a key feature. Hence, conservation of this species will require land management practices that maintain heterogeneous landscape; in particular small forest openings are essential for the species. The approach developed seem to be a promising operational tool for local and regional managers interested in species monitoring and management within the long term.