SEM and LM insights: Spore morphology and its taxonomic significance in Sino Himalayan, Malesian, and European elements of Pteridaceae.

The Pteridaceae family, known for its taxonomic complexity, presents challenges in identification due to high variability among its species. This study investigates the spore morphology employing both SEM and LM techniques in 10 Pteridaceae taxa phytogeographicaly Sino-Himalayan, Malesian, and European elements in Pakistan. The taxa include Adiantum capillus-veneris, A. incisum, A. venustum, Aleuritopteris bicolor, Oeosporangium nitidulum, O. pteridioides, Onychium cryptogrammoides, O. vermae, Pteris cretica, and P. vittata. The objective is to assess their taxonomic relevance and develop a spore-based taxonomic key. Findings indicate differences in spore shape, sizes, exospore thickness, and in surface ornamentation highlighting the potential for taxonomic differentiation. Spores are trilete, and notable differences are observed in the dimension of spores in both distal and proximal sides. Equatorial dimensions vary between 35 and 50 µm, while the polar diameter ranges from 29 to 50 µm. SEM revealed different spore ornamentation types that show several useful characteristics establishing valuable taxonomic variations. The studied Adiantum taxa feature a perispore with tubercules and a micro-granulose surface. The spores of examined Oeosporangium and Aleuritopteris taxa shows cristate sculptures with variable ornamentations. Both species of Onychium have tuberculate-pleated tubercles with sinuous folds on both distal and proximal sides. The surface ornamentation among examined Pteris taxa show variability. PCA analysis indicated that spore quantitative data identified distinct groups, underscoring taxonomic significance. Nevertheless, there was variation observed in surface ornamentation and spore shape, indicating the potential for discrimination among taxa. RESEARCH HIGHLIGHTS: Spore morphology of 10 Pteridaceae taxa has been investigated through LM and SEM. Investigated species shows differences in spore shape, sizes, exospore thickness, and in surface ornamentation. Ornamentation on the perispore provides several valuable characteristics, establishing useful taxonomic distinctions. Spore morphological analysis is effective at the generic level, with minor distinctions discernible at the species level.

Oral Corticosteroid Therapy For Sudden Sensorineural Hearing Loss And Factors Affecting Prognosis.

BACKGROUND: Sudden sensorineural hearing loss (SSNHL) is considered an otologic emergency globally. Aetiology is unknown in most cases but still the disease is believed to be caused by inflammation of the cochlea; therefore, steroids are considered beneficial due to their anti-inflammatory effect. METHODS: This study was conducted on 62 patients of sudden sensorineural hearing loss (SSNHL) in Ayub Medical Complex, Abbottabad. The patients were given prednisolone and their response to the therapy was monitored. Factors like age of the patient, gender, degree of hearing loss and duration of symptoms at initial presentation were recorded and their effect of response of the patient was also noted. RESULTS: The research subjects were 62 patients. Majority of the patients suffered from moderate to moderately severe hearing loss. Age and gender did not influence the response to the treatment. While the patients who presented earlier after the onset of disease and the patients who had milder degree of hearing loss at presentation had a better response to therapy. CONCLUSIONS: Oral corticosteroid therapy is a good therapeutic option for the treatment of sudden sensorineural hearing loss (SSHNL). The response to therapy is better in patients with milder hearing loss and those who present early to the otologist for treatment.

Seasonal Variation Of Acute Otitis Externa Presenting To Ayub Teaching Hospital, Abbottabad.

BACKGROUND: Otitis Externa is a common inflammatory condition of external ear. It is more common in patients having predisposing conditions like trauma, swimming, patients using hearing aids, certain skin pathologies and immunocompromised patients. Increased humidity in rainy season increases the predisposition to otitis externa. METHODS: This descriptive study was carried over the duration of one year in ENT department of Ayub Teaching Hospital, Abbottabad. Patients of all ages and both genders suffering from acute otitis externa were included in the study after taking informed consent. All the information's were recorded in predesigned proforma and then finally evaluated by using SPSS program. RESULTS: The mean age of the patients presenting to us was 39.84±14.48 years (Range 1-78 Years) more commonly in male patients (54.14%). The disease was most commonly seen in rainy season, presenting unilaterally and affecting young adults of age ranging from 31-40 years. CONCLUSIONS: Prevalence of otitis externa is more common in humid climate. Precautionary measures should be taken in rainy and humid condition such as avoidance of self cleaning the ear.