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Papers by Hassan Bouziane

Journal of microbiology, biotechnology and food sciences

Marine organisms are potentially prolific sources of highly bioactive secondary metabolites that ... more Marine organisms are potentially prolific sources of highly bioactive secondary metabolites that might represent useful leads in the development of new pharmaceutical agents. The Moroccan marine biodiversity including macroalgae remains partially unexplored in term of their potential bioactivities. Antibacterial activity of methanolic extracts from 20 species of macroalgae (9 Chlorophyta, 3 Phaeophyta and 8 Rhodophyta) collected from Moroccan Mediterranean coasts was evaluated against Escherichia coli, Staphylococcus aureus and Enterococcus faecalis. The extracts of the studied Rhodophyceae inhibited considerably the growth of the three tested bacterial strains and gave inhibition zones between 20 and 24 mm. The results indicate that these species of seaweed present a significant capacity of antibacterial activities, which makes them interesting for screening for natural products.

International Journal of Biometeorology, 2014

Alternaria is frequently found as airborne fungal spores and is recognized as an important cause ... more Alternaria is frequently found as airborne fungal spores and is recognized as an important cause of respiratory allergies. The aerobiological monitoring of fungal spores was performed using a Burkard volumetric spore traps. To establish predicting variables for daily and weakly spore counts, a stepwise multiple regression between spore concentrations and independent variables (meteorological parameters and lagged values from the series of spore concentrations: previous day or week concentration (Alt t - 1) and mean concentration of the same day or week in other years (C mean)) was made with data obtained during 2009-2011. Alternaria conidia are present throughout the year in the atmosphere of Tetouan, although they show important seasonal fluctuations. The highest levels of Alternaria spores were recorded during the spring and summer or autumn. Alternaria showed maximum daily values in April, May or October depending on year. When the spore variables of Alternaria, namely C mean and Alt t - 1, and meteorological parameters were included in the equation, the resulting R (2) satisfactorily predict future concentrations for 55.5 to 81.6 % during the main spore season and the pre-peak 2. In the predictive model using weekly values, the adjusted R (2) varied from 0.655 to 0.676. The Wilcoxon test was used to compare the results from the expected values and the pre-peak spore data or weekly values for 2012, indicating that there were no significant differences between series compared. This test showed the C mean, Alt t - 1, frequency of the wind third quadrant, maximum wind speed and minimum relative humidity as the most efficient independent variables to forecast the overall trend of this spore in the air.

Revue Française d'Allergologie, 2013

The Science of the total environment, Jan 15, 2013

Cannabis, also called marihuana or hemp, is a wind-pollinated plant that produces hundreds of flo... more Cannabis, also called marihuana or hemp, is a wind-pollinated plant that produces hundreds of flowers on large inflorescences. It is also one of the oldest psychoactive plants known to humanity. Morocco has become one of the main producers of Cannabis resin (hashish), primarily supplying the European market. The aim of this paper is to ascertain whether the atmospheric monitoring of Cannabis pollen can play a role, from a criminological point of view, in the surveillance of Cannabis cultivation in the area of Tetouan (NW Morocco) as well as to estimate pollen emission so that the sensitive population can be warned about the allergic diseases that its pollen can cause. Aerobiological samplings were made with the aid of a Hirst type volumetric trap (Hirst, 1952), which worked uninterruptedly during a 3-year period (2008-2010) according to the methodology proposed by the Spanish Aerobiology Network, the REA. Cannabis pollen was present in the atmosphere of Tetouan mainly from early Apr...

Grana, 2008

Male phenology, processes of microsporogenesis and pollen differentiation were studied for Cupres... more Male phenology, processes of microsporogenesis and pollen differentiation were studied for Cupressus sempervirens from the city of Tetouan (Morocco). Five phenological phases are described based on morphological and structural characters. Pollen mother cells stage, meiosis, microspore maturation and pollen development occurred in winter from December to February. Meiotic development shows typical coniferous pattern. Anthesis takes place two months after bud burst. The flowering phenophase takes place over one month and is associated with the main pollen emission period which started in the last week of February 2007. The pollen production of individual trees in C. sempervirens is also estimated. Tree size, cone density and number of pollen grains per cone are investigated. The results indicate that the number of pollen grains per cone and the total pollen production per tree were in the production range to those obtained in anemophilous trees. This study provides the first data on the onset of the pollen season and on the pollen production in C. sempervirens in Morocco and the contribution of this species to the total amount of airborne pollen content in Tetouan city.

Aerobiologia, 2009

Total pollen production per inflorescence and per square meter were studied in anemophilous speci... more Total pollen production per inflorescence and per square meter were studied in anemophilous species of the Poaceae family, to determine the relative contribution of each species to the total load of pollen released and to identify the species with the highest potential pollen emission. This was done by calculating the number of pollen grains per flower and per inflorescence and by estimating the density of inflorescences in an area of one square meter. Pollen production per inflorescence varied between 12,000 and 15 million grains, often being higher in the perennial species. Mountainous, grassland, riverside, and littoral areas contributed similarly to the amount of pollen grain production per square meter. Species such as Gaudinia fragilis, Hordeum murinum, Lolium rigidum, and Trisetaria panicea, with high pollen records, were found in all the studied areas. Aerobiological analysis will be undertaken to determine the main pollen season of Poaceae species. The results obtained are of great importance for respiratory health management in this region.

Poaceae pollen is one of the most prevalent aeroallergens causing allergenic reactions. The aim o... more Poaceae pollen is one of the most prevalent aeroallergens
causing allergenic reactions. The aim of this study
was to characterise the grass pollen season in Tetouan during
the years 2008–2010, to analyse the effect of some
meteorological parameters on the incidence of the airborne
Poaceae pollen, and to establish forecasting variables for
daily pollen concentrations. Aerobiological sampling was
undertaken over three seasons using the volumetric method.
The pollen season started in April and showed the highest
pollen index in May and June, when the maximum temperature
ranged from 23 to 27 °C, respectively. The annual
pollen score recorded varied from year to year between
2,588 and 5,404. The main pollen season lasted 114–
173 days, with peak days occurring mainly in May; the
highest concentration reached 308 pollen grains/m3. Air
temperature was the most important meteorological parameter
and correlated positively to daily pollen concentration
increase. An increase in relative humidity and precipitation
was usually related to a decrease in airborne pollen content.
External validation of the models performed using data from
2011 showed that Poaceae pollen concentration can be
highly predicted (64.2–78.6 %) from the maximum temperature,
its mean concentration for the same day in other years,
and its concentration recorded on the previous day. Sensitive
patients suffering allergy to Poaceae pollen are at moderate
to highest risk of manifesting allergic symptoms to grass
pollen over 33–42 days. The results obtained provide new
information on the quantitative contribution of the Poaceae
pollen to the airborne pollen of Tetouan and on its temporal
distribution. Airborne pollen can be surveyed and forecast in
order to warn the atopic population.

Journal of microbiology, biotechnology and food sciences

Marine organisms are potentially prolific sources of highly bioactive secondary metabolites that ... more Marine organisms are potentially prolific sources of highly bioactive secondary metabolites that might represent useful leads in the development of new pharmaceutical agents. The Moroccan marine biodiversity including macroalgae remains partially unexplored in term of their potential bioactivities. Antibacterial activity of methanolic extracts from 20 species of macroalgae (9 Chlorophyta, 3 Phaeophyta and 8 Rhodophyta) collected from Moroccan Mediterranean coasts was evaluated against Escherichia coli, Staphylococcus aureus and Enterococcus faecalis. The extracts of the studied Rhodophyceae inhibited considerably the growth of the three tested bacterial strains and gave inhibition zones between 20 and 24 mm. The results indicate that these species of seaweed present a significant capacity of antibacterial activities, which makes them interesting for screening for natural products.

International Journal of Biometeorology, 2014

Alternaria is frequently found as airborne fungal spores and is recognized as an important cause ... more Alternaria is frequently found as airborne fungal spores and is recognized as an important cause of respiratory allergies. The aerobiological monitoring of fungal spores was performed using a Burkard volumetric spore traps. To establish predicting variables for daily and weakly spore counts, a stepwise multiple regression between spore concentrations and independent variables (meteorological parameters and lagged values from the series of spore concentrations: previous day or week concentration (Alt t - 1) and mean concentration of the same day or week in other years (C mean)) was made with data obtained during 2009-2011. Alternaria conidia are present throughout the year in the atmosphere of Tetouan, although they show important seasonal fluctuations. The highest levels of Alternaria spores were recorded during the spring and summer or autumn. Alternaria showed maximum daily values in April, May or October depending on year. When the spore variables of Alternaria, namely C mean and Alt t - 1, and meteorological parameters were included in the equation, the resulting R (2) satisfactorily predict future concentrations for 55.5 to 81.6 % during the main spore season and the pre-peak 2. In the predictive model using weekly values, the adjusted R (2) varied from 0.655 to 0.676. The Wilcoxon test was used to compare the results from the expected values and the pre-peak spore data or weekly values for 2012, indicating that there were no significant differences between series compared. This test showed the C mean, Alt t - 1, frequency of the wind third quadrant, maximum wind speed and minimum relative humidity as the most efficient independent variables to forecast the overall trend of this spore in the air.

Revue Française d'Allergologie, 2013

The Science of the total environment, Jan 15, 2013

Cannabis, also called marihuana or hemp, is a wind-pollinated plant that produces hundreds of flo... more Cannabis, also called marihuana or hemp, is a wind-pollinated plant that produces hundreds of flowers on large inflorescences. It is also one of the oldest psychoactive plants known to humanity. Morocco has become one of the main producers of Cannabis resin (hashish), primarily supplying the European market. The aim of this paper is to ascertain whether the atmospheric monitoring of Cannabis pollen can play a role, from a criminological point of view, in the surveillance of Cannabis cultivation in the area of Tetouan (NW Morocco) as well as to estimate pollen emission so that the sensitive population can be warned about the allergic diseases that its pollen can cause. Aerobiological samplings were made with the aid of a Hirst type volumetric trap (Hirst, 1952), which worked uninterruptedly during a 3-year period (2008-2010) according to the methodology proposed by the Spanish Aerobiology Network, the REA. Cannabis pollen was present in the atmosphere of Tetouan mainly from early Apr...

Grana, 2008

Male phenology, processes of microsporogenesis and pollen differentiation were studied for Cupres... more Male phenology, processes of microsporogenesis and pollen differentiation were studied for Cupressus sempervirens from the city of Tetouan (Morocco). Five phenological phases are described based on morphological and structural characters. Pollen mother cells stage, meiosis, microspore maturation and pollen development occurred in winter from December to February. Meiotic development shows typical coniferous pattern. Anthesis takes place two months after bud burst. The flowering phenophase takes place over one month and is associated with the main pollen emission period which started in the last week of February 2007. The pollen production of individual trees in C. sempervirens is also estimated. Tree size, cone density and number of pollen grains per cone are investigated. The results indicate that the number of pollen grains per cone and the total pollen production per tree were in the production range to those obtained in anemophilous trees. This study provides the first data on the onset of the pollen season and on the pollen production in C. sempervirens in Morocco and the contribution of this species to the total amount of airborne pollen content in Tetouan city.

Aerobiologia, 2009

Total pollen production per inflorescence and per square meter were studied in anemophilous speci... more Total pollen production per inflorescence and per square meter were studied in anemophilous species of the Poaceae family, to determine the relative contribution of each species to the total load of pollen released and to identify the species with the highest potential pollen emission. This was done by calculating the number of pollen grains per flower and per inflorescence and by estimating the density of inflorescences in an area of one square meter. Pollen production per inflorescence varied between 12,000 and 15 million grains, often being higher in the perennial species. Mountainous, grassland, riverside, and littoral areas contributed similarly to the amount of pollen grain production per square meter. Species such as Gaudinia fragilis, Hordeum murinum, Lolium rigidum, and Trisetaria panicea, with high pollen records, were found in all the studied areas. Aerobiological analysis will be undertaken to determine the main pollen season of Poaceae species. The results obtained are of great importance for respiratory health management in this region.

Poaceae pollen is one of the most prevalent aeroallergens causing allergenic reactions. The aim o... more Poaceae pollen is one of the most prevalent aeroallergens
causing allergenic reactions. The aim of this study
was to characterise the grass pollen season in Tetouan during
the years 2008–2010, to analyse the effect of some
meteorological parameters on the incidence of the airborne
Poaceae pollen, and to establish forecasting variables for
daily pollen concentrations. Aerobiological sampling was
undertaken over three seasons using the volumetric method.
The pollen season started in April and showed the highest
pollen index in May and June, when the maximum temperature
ranged from 23 to 27 °C, respectively. The annual
pollen score recorded varied from year to year between
2,588 and 5,404. The main pollen season lasted 114–
173 days, with peak days occurring mainly in May; the
highest concentration reached 308 pollen grains/m3. Air
temperature was the most important meteorological parameter
and correlated positively to daily pollen concentration
increase. An increase in relative humidity and precipitation
was usually related to a decrease in airborne pollen content.
External validation of the models performed using data from
2011 showed that Poaceae pollen concentration can be
highly predicted (64.2–78.6 %) from the maximum temperature,
its mean concentration for the same day in other years,
and its concentration recorded on the previous day. Sensitive
patients suffering allergy to Poaceae pollen are at moderate
to highest risk of manifesting allergic symptoms to grass
pollen over 33–42 days. The results obtained provide new
information on the quantitative contribution of the Poaceae
pollen to the airborne pollen of Tetouan and on its temporal
distribution. Airborne pollen can be surveyed and forecast in
order to warn the atopic population.