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Simplified search suggestions : Norhayati Daud

Identification of Tacca chantrieri (dioscoreaceae) through anatomical and morphological characters

Mohd Noor Nor Nafizah, Wun Shun Jie, Mohamed Fatimah, Daud Norhayati, Alimon Hasimah,

Abstract

Anatomy and morphological characters were employed to identify four samples of Tacca sp. (Belimbing Tanah) from different localities in Perak. Anatomical characters including leaf epidermal characters, leaf venation, type of stomata and trichomes were investigated through transverse sections, epidermal peel and leaf clearing procedures. The outline and vascularization of the sections were also investigated. Result has shown that Tacca from four different localities in Perak were similar anatomically. However, morphologically these four species can be differentiated mostly based on their leaves, flowers and fruits. The leaf margins are slightly different of either entire or denticulate, and the colours of floral bracts are either purplish-black or purplish-black at the base gradually turns white to the apex. Eventhough they are slightly different morphologically, Tacca of Gunung Lang and Gunung Liang were suggested as T. chantrieri based on dichotomous key of Kalkman which emphasizes on.....

Article Published 2015 3188 hits Available

Preliminary toxicity test and phytochemical screening of Sargassum polycystum crude extracts from marine macroalgae

Daud Norhayati, Mohd Noor Nor Nafizah, Alimon Hasimah, Abdul Rashid Nursuhaidah,

Abstract

Sargassum polycystum is a species of brown algae (Phaeophyta). Some recent studies have found many uses of this algae, one of them is for medicine. In this study, crude hexane, dichloromethane and methanol extracts of Sargassum polycystum were tested for toxicity activity and screened for its principal chemical substances. The toxicity test was done using Brine Shrimp Lethality (BSL) test against Artemia salina Leach. The results of this study showed the LC50 value of methanol extract was 295.12 mgml-1, while both hexane and dichloromethane extracts were 275.42 mgml-1. The BSL test exhibited no significant toxicity against A.salina. Phytochemical screening shows S. polycystum contained non polar and polar components. As the conclusion, S. polycystum contained secondary metabolites that are not toxic to A. salina and they are not a potential source for toxicity...

Article Published 2015 3418 hits Available

Phytochemical screening of sargassum sp and in vitro seed germination test

Norhayati Daud

Abstract

The aim of the present paper is to evaluate the phytochemical screening of Sargassum sp and also to investigate the effect of its crude extracts on seed germination and seedling development of Capsicum annum. The samples were dried and made to coarse powder and stored at -20?C for further analysis. Crude extracts were prepared using three different solvents (DCM, methanol and hexane). Different concentrations of crude extracts were prepared in solid medium using MS basal media and germination tests were carried out in vitro. High concentration (50 uL/mL) of hexane extract exhibited the most promoting effect on seed germination and seedling development of Capsicum annum followed by methanol (50 uL/mL) and DCM (50 uL/mL). The presence of micro and macro nutrients, vitamins, growth hormones and other constituents in the seaweed extract might be very much useful to the crop but their concentration should be appropriate to enhance growth and productivity. It may be concluded that Sargassum .....

Article Published 2019 1365 hits Available

Callus formation and phytochemical constituents of finger eggplant (Solanum Melongena L.)

Norhayati Daud

Abstract

This study examined the efficiency of callus induction on optimum concentrations of NAA (αnaphthaleneacetic acid) and BAP (6-benzyladenine) from culturing stem and leaf explants of finger eggplant (Solanum sp.) and investigated the phytochemical constituents of callus tissue. Seeds were sterilized by using 3 and 5 % Clorox solution, which gave the highest number of survival seeds (100 %) and were grown in vitro plantlets. The highest frequency of callus induction (100.00 ± 0.00 %) was obtained from stems and leaf explants that were excised from in vitro plantlets. The stem explants cultured on MS medium consisted of 1.0 mg/L NAA + 1.0 mg/L BAP, giving the maximum mean callus fresh weight (0.14 ± 0.05 g). Meanwhile, the leaf explants cultured on MS medium consisted of 0.5 mg/L NAA + 2.0 mg/L BAP, generating the maximum mean callus fresh weight (0.48 ± 0.10 g). The highest frequency of callus induction (88.00 ± 1.60 %) was obtained in solidified MS medium supplemented with 0.5 mg/L .....

Article Published 2020 1278 hits Available

Kajian Morfogenesis tumbuhan hiasan Saintpaulia Ionantha H. Wendl. dalam sistem kultur tisu

Norhayati Daud

Abstract

Kajian morfogenesis in vitro Saintpaulia ionantha telah berjaya dilakukan. Eksplan petiol merupakan eksplan paling responsif berbanding eksplan daun, pedunkel dan petal, iaitu menghasilkan 100 % regenerasi pucuk dan menghasilkan pucuk yang terbanyak (purata 15.0 ± 0.8 pucuk) di atas media MS yang mengandungi 1.0 mg/l IAA dan 2.0 mg/1 Zeatin selepas 8 minggu. Media ini dipilih sebagai media optima untuk regenerasi pucuk kerana menghasilkan banyak pucuk dan tumbesaran pucuk yang sihat. Pucuk yang disubkultur dalam media MS pepejal telah menghasilkan pucuk berganda dengan ciri-ciri pucuk normal dan seterusnya menghasilkan sistem akar yang lebat di dalam media Yz MS tanpa hormon. Dalam kajian embriogenesis somatik ke atas Saintpaulia ionantha, induksi kalus embriogenik tertinggi (63.3 ± 3.2 %) diperolehi dari eksplan daun di dalam media MS yang ditambah dengan 1.5 mg/l 2,4-D dan 2.0 mg/1 HAP selepas 12 minggu. Embrio somatik telah dihasilkan secara langsung dari kultur eksplan daun di da.....

Thesis Published 2005 1445 hits Available

Callus induction and phytochemical constituents of finger eggplant (Solanum sp.)

Norhayati Daud

Abstract

This study examined the efficiency of callus induction on optimum concentrations of NAA (?-naphthaleneacetic acid) and BAP (6-benzyladenine) from culturing stem and leaf explants of finger eggplant (Solanum sp.) and investigated the phytochemical constituents of callus tissue. Seeds were sterilized by using 3 and 5 % Clorox solution, which gave the highest number of survival seeds (100 %) and were grown in vitro plantlets. The highest frequency of callus induction (100.00 � 0.00 %) was obtained from stems and leaf explants that were excised from in vitro plantlets. The stem explants cultured on MS medium consisted of 1.0 mg/L NAA + 1.0 mg/L BAP, giving the maximum mean callus fresh weight (0.14 � 0.05 g). Meanwhile, the leaf explants cultured on MS medium consisted of 0.5 mg/L NAA + 2.0 mg/L BAP, generating the maximum mean callus fresh weight (0.48 � 0.10 g). The highest frequency of callus induction (88.00 � 1.60 %) was obtained in solidified MS medium supplemented with 0.5 m.....

Article Published 2021 1092 hits Available

Pembangunan koswer multimedia interaktif istilah Biologi

Norhayati Daud

Abstract

Kajian ini dijalankan bertujuan untuk membangunkan sebuah koswer glosari istilah-istilah Biologi berasaskan Huraian Sukatan KBSM untuk pembelajaran Biologi. Koswer ini digunakan dengan penekanan terhadap penerokaan menggunakan strategi pembelajaran kendiri dan dibina dengan berkonsepkan interaktif. Reka bentuk kajian ini telah merujuk dan menggunakan Model ADDIE. Koswer glosari istilah-istilah Biologi ini telah dibina menggunakan koswer Macromedia Flash Version 8, Adobe Photoshop CS2, dan Sound Forge Version 7 untuk membina elemen-elemen multimedia. Penilaian dijalankan ke atas sampel kajian yang terdiri daripada 20 orang pelajar tingkatan 4 yang dipilih secara rawak dan 2 orang guru Biologi. Instrumen yang digunakan adalah set soal selidik dan sesi temu bual. Dapatan kajian menunjukkan secara keseluruhan kesemua pelajar memberi pandangan positif dengan tahap interpretasi sangat baik bagi reka bentuk informasi (min = 4.06), tahap baik bagi reka bentuk persembahan maklumat (min= 3.35) d.....

Article Published 2011 183 hits Available

Effects of gamma radiation on growth of Sinningia speciosa callus tissue

Norhayati Daud

Abstract

In this study, the in vitro tissue culture of the Sinningia speciosa callus was established at 25_1 _C with light intensity 1000 _mol m-2 sec-1 and 70-80% relative humidity with a 16/8h light/dark photoperiod. Additionally, gamma radiation of 10-60 Gy was applied and the effects of gamma rays on growth of Sinningia speciosa callus tissue were investigated. A 100% callus initiation was observed in petal explants cultured on MS medium supplemented with combinations of 0.5 mg L-1 NAA and 2.0 mg L-1 BAP resulted in 100% callus induction after being cultured for 4 weeks. This medium was considered optimal medium for callus induction because it can produce normal growing healthy callus. Callus growth was based on callus weight and changing textures and colour of callus; determined following exposure of the calli to different doses of gamma rays. Results obtained indicated that callus growth was reduced when the dose of radiation was increased. It was found that increasing doses of gamma radi.....

Article Published 2011 179 hits Available

Morphological studies of marine macroalgae at Sri Rusa beach, Port Dickson, Negeri Sembilan, Malaysia

Norhayati Daud

Abstract

An attempt was made to record the biodiversity and morphological characteristics of marine macroalgae within the littoral and sublittoral zones at Sri Rusa beach, Port Dickson, Negeri Sembilan, Peninsular Malaysia. Samples collected during low tides consisted a total of nine species represented by three divisions, six of which were from the Chlorophyta, two from the Phaeophyta and one species of the Rhodophyta. Among the dominant species commonly found in this study area were the Phaeophytes Sargassum polycystum C. Agardh and Padina minor Yamada. For the division Chlorophyta, the genus Caulerpa was the largest, represented by five species, namely C. lentillifera, C. microphysa, C. prolifera, C. racemosa and C. sertulariodes. The genera Cladophora from Chlorophyta and Acantophora from Rhodophyta were each represented by one species, namely Cladophora sp. and Acantophora specifera. Most of the macroalgae found in the littoral and sublittoral zones were attached to sand and rock as their .....

Article Published 2015 110 hits Available

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