Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userDescription Of Spores Of Some Syrian Mosses By Using Scanning Electron Microscope
توصيف لأبواغ أنواع الحزازيات السورية باستعمال المجهر الالكتروني الماسح
941
0 7
0
(
0
)
Authors
بسام الأعرج( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
مثل هذا البحث أول دراسة وصفية لأبواغ الحزازيات في سورية باستعمال تقنية المجهر الالكتروني الماسح، إذ جمعت العينات من عدة مناطق من سورية و حددت أسماؤها التي صنّفت سابقاً مورفولوجيـاً و تشريحياً. وصفت الأبواغ من حيث أشكالها و وجوهها المختلفة و أشكال الزوائد التي تحملهـا و توزعهـا بواسطة المجهر الالكتروني الماسح في جامعة يينا بألمانيا، و قِيست أحجامها و صورت بعدة قياسات. و قد لوحظ في الأبواغ اختلافات واضحة في شكل تقعر الوجه الأمامي و في وجود نسبة كثافة و توزع للزوائـد على الوجهين. لذلك يمكن إضافة صفات الأبواغ إلى المعايير الأخرى المستخدمة في تصنيف الحزازيات.
This research is the first descriptive and classifiable study of the Syrian spores of mosses in Syria and Arab world by using the technique of scanning electron microscope. Samples have been collected from several areas from Syria and their names have been defined and classified earlier. The study of nine Spieces of Spores have been completed and their shapes, different faces and the shapes of redundant which they carry and their distribution by scanning electron Microscope are done in Jena University, Germany. Their sizes have been measured and viewed in several sizes. It has been noticed clear differences in Spores, in the Shape of concavity of the frost face and in existence and relation of denseness and distribution of redundant on the faces. So, The characters of Spores can be added to other standards which are used in Classification of mosses.
References used
Al-Araj, B. (1991). Beitrage zum Merkmalsbestamd der Gattung Polytrichum. Boros, A. Jarai – Komlod, M. (1975). An Atlas of recens European moss Spores. Budapest
Clark, G. C.S. (1979). Spore Morphology and Bryophyte Systematics In. Clarke & Duckett, Bryophyte Systematics. V. 14, pp 231-250 London, New York
Frey, W. (1981). Morphologie und Anatomie der laubmoose. In. Advances in Bryologie Braunschweig V. 1, pp 399-477
rate research
Read More
Almond seed wasp Eurytoma amygdali . End is a serious pest on
almond orchards which causes an economic losses in production.
This study was carried out for the morphological description of the
male stages of this pest (larva, pupa and adult) using
stereomicroscope and Scanning Electron Microscope.
Propolis is used directly on dentin to reduce dental sensitivity following posterior composite restorations. The research aims to test its effect on the bonding of composite to dentin in posterior composite fillings by scanning electron microscopy. T
he depth of penetration of the composite resin within the dentinal canals was evaluated by comparing the frequency of the presence of resin protrusions and measuring Their lengths and the thickness of the hybrid layer were measured in the three sample groups.
Laser use and applications in dentistry has increased dramatically in the last
years. Laser etching of enamel may provide an alternative for conventional acid etching. The aim of this
study was to evaluate, under Scanning Electron Microscope(SEM),
enamel surface morphology after
laser irradiation with or without the addition of photoabsorber (black ink); with or without acid etching.
laser enamel etching produced surface
roughness that might be used for the infiltration and subsequent mechanical retention of resin.
This research was conducted at the Faculty of Agriculture, Department of
Food Science laboratories to isolate lactic acid bacteria from some Syrian milk
products (milk, yogurt, cheese) and determine some morphological,
physiological characteristic and the ability of these isolates to ferment sugars.
Photosynthetic transport was studied as an indicator of photosynthesis efficiency in
two bread wheat cultivars (ACSAD 899, ACSAD 1059) under the influence of one of the
salt stress.
This study was carried out in sand cultures irrigated with nutrie
nt solution in a
growth chamber, and 14 days seedlings were treated with 100 mM of sodium chloride.
Later the electron transport rates in those plants thylakoids were measured in 21, 28, 35
days of the experiment.
Electron transport rates decreased in ACSAD 899 and reached 57% in the last day of
the experiment, while it was 24.6% in ACSAD 1059.
The decrease in photosynthetic electron transport rate leads to a decrease in the
reduction rate of CO2 and the plant productivity as a consequence. Therefore, it could be
used as criterion to express photosynthesis.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
