Asian Journal of Biology <p style="text-align: justify;">The aim of <strong>Asian Journal of Biology&nbsp;(ISSN: 2456-7124)</strong>&nbsp;is to publish high quality papers (<a href="/index.php/AJOB/general-guideline-for-authors">Click here for Types of paper</a>) with broad areas of Aerobiology, &nbsp;Agriculture, Anatomy, Astrobiology, Biochemistry, Bioengineering, Bioinformatics, Biomathematics or Mathematical Biology, Biomechanics, Biomedical research, Biophysics, Biotechnology, Building biology, Botany, Cell biology, Conservation Biology, Cryobiology, Developmental biology, Food biology, Ecology, Embryology, Entomology, Environmental Biology, Epidemiology, Ethology, Evolutionary Biology, Genetics, Herpetology, Histology, Ichthyology, Integrative biology, Limnology,&nbsp; Mammalogy, Marine Biology, Microbiology, Molecular Biology, Mycology, Neurobiology, Oceanography, Oncology, Ornithology, Population biology, Population ecology, Population genetics, Paleontology, Pathobiology or pathology, Parasitology, Pharmacology, Physiology, Psychobiology, Sociobiology, Structural biology, Virology and&nbsp; Zoology. This is a quality controlled, peer-reviewed, open access INTERNATIONAL journal.</p> SCIENCEDOMAIN international en-US Asian Journal of Biology 2456-7124 Comparative Study of Airborne Pollen from the Northern to the Southern of Tunisia <p>Aerobiology is a multidisciplinary science dealing with biological particles in the atmosphere generated by natural activities during flowering season. Airborne pollen is now the main studied biological structure which is used as a reliable tool to study plant phenology, plant distribution changes and prediction of crop production. The main aims of this work is to determine the distribution of the different spring flowering species from the North to the South of Tunisia and to establish the pollen spectrum of three regions Mornag (North), Menzel M’hiri (Centre) and Chaal (South) in 2017.</p> <p>Airborne pollen data were collected using three volumetric Hirst-type spore traps placed in Mornag (36°39N; 10°16E), Menzel M’hiri (35°38N; 10°41E) and Chaal (34°34N; 10°19E) during olive flowering season. The highest pollen index was recorded in the north (Mornag, 6487.1) corresponding mainly to 18 different pollen types emitted by anemophilous species with an important presence of <em>Cupressus</em> pollen type having the highest contribution. Lower pollen amounts were recorded in Menzel M’hiri (5983.8) and Chaal (925.3). <em>Olea eurpoeae </em>was the most presented pollen type in these regions. However comparing the different study sites we can note a large distribution of some taxa from north to the south. The main common taxa were <em>Olea europaea</em>, Cupressaceae, Poaceae and Amaranhaceae. Their atmospheric concentrations varied also between the regions. Individual pollen index showed a sharp heterogeneity between the taxa in the same region in one hand and between the study sites in the other hand, thus a statistical analysis was performed to define the main group of taxa according to their individual pollen index. Flowering phenology of the main common taxa was also established.</p> S. Hadj Hamda A. Ben Dhiab M. Msallem A. Larbi ##submission.copyrightStatement## 2019-10-15 2019-10-15 1 8 10.9734/ajob/2019/v8i330063 Effect of Hypoxia on the Induction of Premature Cellular Senescence in the Cells of Periodontium during Orthodontic Tooth Loading <p>During orthodontic treatment, application of forces to move the teeth within the dento-alveolar complex is associated with structural and biological tissues changes. One of the main changes is hypoxia which is due to the compression of blood vessels resulting in insufficient oxygenation of the tissues. On orthodontic loading, hypoxia causes irreversible cell cycle arrest (or so called cellular senescence) and apoptosis of the tissue cells around the teeth especially on the compression zone. Excessive hypoxia, in turn leads to a massive, an inevitable and detrimental destruction of tissues supporting the tooth such as remarkable root resorption. This mini-review is highlighting the effect of orthodontic force in inducing a local hypoxic environment and its consequences in causing cells death of the periodontal cells.</p> Luay Thanoon Younis Faisal Ismail Elsayed Bahnasi Aida Nur Ashikin Abd Rahman Mohamed Ibrahim Abu Hassan ##submission.copyrightStatement## 2019-10-01 2019-10-01 1 5 10.9734/ajob/2019/v8i330062