Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userSeasonal Changes Effect on Yield and Quality of Carrageenan from the Marine Alga Hypnea musciformis in Syrian Water
تأثير التغيرات الفصلية في مردود كاراجينان الطحلب البحري musciformis Hypnea و صفاته في المياه السورية
1084
0 9
0
(
0
)
Added by
Damascus University ورقة بحثية
Publication date
2011
fields
Biology
and research's language is
العربية
Authors
آصف عباس( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
درس في هذا البحث تأثير التغيرات الفصلية (خلال عام واحد) في مردود كاراجينان الطحلب البحـري musciformis Hypnea و صفاته. تراوح مردود الكاراجينان بين 31 - 46 % و قد سجل أعلى مـردود بين شهري نيسان و أيلول و أدناه في كانون الأول. وصلت القيمـة العظمـى لقـوة الهـلام فـي أيلـول خلال آذار. راوحت قـيم اللزوجـة بـين 22 و 44 2 في حين سجلت القيمة الدنيا 90 غ/سم 2 260غ/سم سنتيبوازاً، و سجلت أعلى قيمة في أيلول. لم يلاحظ أي تأثير للتغيرات الفـصلية فـي درجتـي الـذوبان 60-70°م و التهلم 42-50°م. تشير هذه النتائج إلى إمكانية عد musciformis Hypnea مصدراً جيداً لإنتاج الكاراجينان التجاري مستقبلاً.
Seasonal changes effect on yield and quality of carrageenan from the Syrian marine alga Hypnea musciformis were studied during 1 year. The carrageenan yield varied from 31 to 46%. The maximum yield was recorded between April and September, while low carrageenant content was recorded in December. The gel strength of carrageenan was maximum in September (260 g/cm²) and minimum in March (90 g/cm²). The viscosity ranged from 22 to 44cP with a peak recorded in September. Seasonal variations were not observed in the gelling (42-50 C°) and melting (60-70 C°) temperatures of carrageenan. The results indicate that Hypnea musciformis can be considered a good sources for production of commercial carrageenan in future.
References used
Amimi, A., Mouradi, A., Bennasser, L., Givernaud, T. (2007). Seasonal variations in thalli and carrageenan composition of Gigartina pistillata (Gmelin) Stackhouse (Rhodophyta, Gigartinales) harvested along the Atlantic coast of Morocco. Phycol. Res. 55(2): 143–149
Armisen, R., Galatas, F. (1987). Production, properties and uses of agar. In: McHugh DJ (ed.), Production and Utilisation of Products from Commerical Seaweeds. FAO Fish. Tech. Paper. 288: 1-57
Bird, KT., Hanisak, MD., Ryther, J. (1981). Chemical quality and production of agars extracted from Gracilaria tikvahiae grown in different nitrogen enrichment conditions. Bot. Mar. 24: 441–444
rate research
Read More
The research aims to study the effect of Seasonal variations in yields and qualities
of agar seaweed Pterocladia capillacea. The results show that there is a clear impact of the
Seasonal variations in the yield, physical and chemical properties of
the extract agar.
Agar yields ranging from 10.1 to 33.8% and has been the highest in the month of June and
below 33.8% in December, 10.1% of the years 2014 to 2015. Reached the maximum value
of the strength of the gel in June, 789 g/cm2 and the minimum value of 183 g/cm2 through
December and the average rate of sulfates 3.42%. The viscosity values ranged between
35.7 and 81.4 cP, and recorded the highest value in July 81.4 cP. Melting temperature
ranged 78- 86.5 °C and Gelling temperature from 35 to 25 °C.
The research aims to study is to study the effect of the pH factor of Pterocladia
capillacea on agar yield and some of its physical properties using different degrees of pH
(4- 5.5 - 5.5 - 6.5 - 7.5 - 7.5 - 8). The maximum yield of agar was 37.45%
at pH = 5 and
562g / cm2 and viscosity 10.7cP and 15.45% at pH = 8 with the highest strength of 768 g
/cm2 and viscosity of cP 156. The degree of melting and melting of agar Between (22-
33.5 οC) and (75- 86 οC), respectively.
The research aims to study the effect of of agar extraction
temperature (80-90- 100-110 and 120) Syrian alga Pterocladia
capillacea on its yield and and some physical properties.
The aim of this research is to determine the effect of seasonal changes on the
yield of morphologically intact oocytes for in vitro maturation and consequently
for fertilization and embryo production. Determining the impact of seasonal
changes hel
ps us to increase the intact oocytes yield, and better use of in vitro
culturing technique of cow oocytes. This leads to: benefit from animals of
genetic superiority, maintenance the biodiversity of animal genetic resources by
using deep-freezing technique of pre/post in vitro fertilized oocytes taken from
cow ovary of animals after slaughter.
The results of this research paper show that, the intact oocytes yield for in
vitro culturing differs accordingly with year seasons. The lowest percentage of
intact cells 29.5 were recorded in the period between May and September,
whereas the highest percentage of intact cells 42.6% were recorded in the
period between October and March. There was significant difference (P<0.001)
between the two periods for intact cells.
The purpose of this study is to highlight on the ability of the alga Ulva fasciata to accumulate some organic pollutants (polycyclic aromatic hydrocarbons :PAHS, polychlorinated biphenyls: PCBs). The samples were collected from three sites at the Syr
ian coast during 2011.
The result of this study revealed the ability of alga to accumulate significantly the PAHs and their concentrations ranged from 30.52 to 72.7 ng/g dw, While the PCBs concentrations were less, it ranged between 6.00 and 24.01 ng/g dw.
The highest concentration of PAHs was observed at the Dirasat site, while the highest concentration of the PCBs found at the Cornish of Jablah. The logarithm bioconcentration factors (log BCF) of the aromatic compounds with three aromatic rings were close to the logarithm octanol/water partitioning coefficients (log Kow ), unlike the compounds with higher rings, where log BCF were obviously less than corresponding log Kow.
The log BCF values of PCBs increased with increasing chlorine atoms (2 - 6 atoms) , while no increasing was observed for components that contain 7 to 8 chlorine atoms
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
