Use of urea coated with natural products to inhibit urea hydrolysis and nitrification in soil   总被引：2，自引：0，他引：2  

Dharani D. Patra  Usha Kiran  Sukhmal Chand  Mohd. Anwar 《Biology and Fertility of Soils》2009,45(6):617-621

Laboratory incubation experiments were conducted with uncoated urea or urea coated with dementholized oil (DMO), pitch (the mint oil discard), terpenes (the products of menthol mint oil), or dicyandiamide (DCD) to study the retardation of urea hydrolysis and nitrification in soil. Two levels (0.5 and 1 %) of coating were tested. Urea was applied at a rate of 200 mg kg⁻¹ of dry weight of soil. The urea hydrolysis and nitrification processes were inhibited by all three natural products. All the three natural products viz., DMO, terpenes, and pitch significantly retarded urease activity of soil.  相似文献   

Evaluation of morpho-physiological traits of MRQ74 pyramided lines with drought yield QTLs     

Asmuni Mohd Ikmal  Zainuddin Nurasyikin  Arvind Kumar  Abd Aziz Shamsudin Noraziyah 《Euphytica》2018,214(6):98

Drought regularly affects rainfed lowland and upland rice ecosystems in Malaysia. Three drought yield QTLs, viz qDTY _2.2 , qDTY _3.1 and qDTY _12.1 successfully pyramided into MRQ74 to increase its yield under reproductive stage drought stress (RS). Forty-eight genotypes comprising 39 pyramided lines (PLs) with different qDTYs combinations, four parents including MRQ74 (recipient) and five checks were evaluated for morpho-physiological traits under RS and non-stress (NS). This study aims to determine which traits influenced by individual qDTY and qDTY combinations and to gain better understanding of QTL interactions in enhancing grain yield (GY) under RS. Results showed plant height, number of panicles, root length, root weight, relative water content and 100-grain weight increased while chlorophyll content and GY decreased under RS compared to NS. No significant difference was observed in days to flowering, leaf rolling and grain length between selected PLs and MRQ74 under RS. Six PLs with yield advantage (YA) of 208.17–1751.63 kg ha^?1 compared to MRQ74 in RS but yielded similar to MRQ74 under NS were further selected. Under RS, qDTY class analysis showed qDTY _12.1 individually and combination qDTY _12.1  + ?qDTY _2.2 produced the highest yield of 1521.77 and 1092.30 kg ha^?1 respectively. qDTY _12.1 as single or combination with other qDTY is the best qDTY in stabilizing GY under RS. PL-77 with qDTY _12.1 is the best PL with YA of more than 1100 kg ha^?1 compared to MRQ74 in both RS and NS conditions can be recommended for cultivation in normal and drought-prone areas.  相似文献   

Assessment of Compost Extract on Yield and Phytochemical Contents of Pak Choi (Brassica rapa cv. chinensis) Grown under Different Fertilizer Strategies     

Abd Rahman Jabir Mohd Din  Kian Kai Cheng  Mohamad Roji Sarmidi 《Communications in Soil Science and Plant Analysis》2017,48(3):274-284

An experiment was conducted to assess the effect of different extraction of compost extracts on pak choi (Brassica rapa cv. chinensis) under two fertilizer regimes. Aerated compost extract (ACE) and non-aerated compost extract (NCE) were prepared and all treatments (ACE + organic fertilizer, NCE + organic fertilizer, ACE + inorganic fertilizer, NCE + inorganic fertilizer) were conducted in randomized block design. Soil microbiological analysis after treatment was done. Plants grown with ACE + inorganic fertilizers yielded maximum in fresh, dry weight, and N mineral content compared to others. Plants receiving NCE + organic fertilizers produced a higher phenolic content, whereas antioxidant capacity was observed maximum at NCE + inorganic fertilizers. Soil microbiological analysis significantly increased in yeast and nitrogen fixing bacteria count at ACE + organic fertilizers. The co-application of inorganic fertilizers and compost extract had a significant effect on vegetative growth, quality of the pak choi, and soil fertility.  相似文献   

Influence of Poly(lactic acid) Layer on the Physical and Antibacterial Properties of Dry Bacterial Cellulose Sheet for Potential Acute Wound Healing Materials     

Choi Yee Foong  Mohd Syahir Anwar Hamzah  Saiful Izwan Abd Razak  Syafiqah Saidin  Nadirul Hasraf Mat Nayan 《Fibers and Polymers》2018,19(2):263-271

Dry bacterial cellulose nanofiber (BC) sheet coated with poly(lactic acid) (PLA) was developed and characterized towards acute wound healing applications. This new approach of PLA coating on BC revealed enhanced physical and antibacterial properties. Commercial BC sheets originated from the manufacturing of nata de coco jelly were dried and coated with the PLA at various concentrations of 2, 4, 6, 8, 10 and 12 % w/v for the purpose of improving the mechanical properties and followed by loading of antiseptic such as benzalkonium chloride (BAC). PLA has been proposed for the use of coating materials at a concentration of 8 %, the biocomposite sheet started exhibiting a low moisture uptake, prolonged swelling in simulated wound fluid solution and high tear (9.17 Nm²/kg) and burst indices (32.5 kPa·m²/g). The 8 % PLA coating revealed porous fiber-like morphology as observed under scanning electron microscope. Therapeutic loading capacity of the BC/8 PLA was substantially higher than the pristine BC. Furthermore strong antimicrobial activities against Staphylococcus aureaus and Escherichia coli were observed for the BC/8PLA biocomposite film. These reports were clearly suggestive of the fact that synthetic biodegradable polymers, such as PLA, may be exploited for the synergistic combination with BC for antimicrobial and acute wound management. This new and modified fiber source material could reduce the dependency on plant based cellulose for more demanding biomedical applications such as wound healing materials, vascular graft, cartilage replacement, drug delivery and tissue engineering.  相似文献   

Preliminary study of the performance of crude illipe oil (Shorea macrophylla) as a dietary lipid source for riverine cyprinid Tor tambroides     

Kamarudin  Mohd Salleh  Bami  Mahkameh Lashkarizadeh  Arshad  Aziz  Saad  Che Roos  Ebrahimi  Mahdi 《Fisheries Science》2018,84(2):385-397

Fisheries Science - Illipe Shorea macrophylla is a riverine fruit naturally eaten by Malaysian mahseer Tor tambroides and other riverine cyprinids. The effects of crude illipe oil on the growth...  相似文献   

Efficacy of VP2 protein expressed in E. coli for protection against highly virulent infectious bursal disease virus     

Abdul Rahman Omar  Chong Lee Kim  Mohd Hair Bejo  Aini Ideris 《Journal of veterinary science (Suw?n-si, Korea)》2006,7(3):241-247

The ability of a heat-inactivated whole virus from a highly virulent infectious bursal disease virus (hvIBDV) and VP2 protein from hvIBDV expressed in E. coli provided protection against a hvIBDV challenge in specific-pathogen-free (SPF) chickens. Six out of seven chickens that were injected three times with crude VP2 protein developed significant antibody titer against IBDV. However, only four out of the seven chickens survived the hvIBDV challenge. Despite showing low antibody titer profiles, all chickens immunized with the heat-inactivated whole virus also survived the challenged with hvIBDV. However, all of these chickens had bursal atrophy and mild to moderate depletion of lymphocytes. Thus, antibodies raised against IBDV VP2 protein expressed in E. coli and denatured IBDV proteins induced some degree of protection against mortality but not against bursal damage following challenge with hvIBDV.  相似文献   

Yield load prediction of nailed timber joints using nail diameter and timber specific gravity     

Mohd.?Zamin?JumaatEmail author  Bona?Murty 《Wood Science and Technology》2004,38(8):599-615

Prediction of yield load has nowadays been accepted as the basis for the limit state method of the design. Currently, there are many methods to predict the yield load of timber joints. These methods, i.e Foschi, Johansen, Smith and US 5% nail diameter offset, are reviewed in-depth in this paper. In this study, the authors presented a new approach which, hopefully, is simpler than the existing methods. The paper outlines the works carried out to arrive at the formula. About 300 Malaysian timber nailed joints were fabricated and tested to obtain the relationship between yield load and maximum load and to propose a new method to predict the yield load of a nailed joint. There seems to be a direct relationship between the yield load and the maximum load. From this relationship, a new formula, which depends only on nail diameter and specific gravity, was established.  相似文献   

Evaluation of Osteogenic Potentials of Avian Demineralized Bone Matrix in the Healing of Osseous Defects in Pigeons          下载免费PDF全文

Reza Sanaei DVM  MVSc  Jalila Abu DVM  MS  PhD  Mojgan Nazari DVM  MVSc  Mohd A. B. Zuki DVM  PhD  Zeenathul N. Allaudin DVM  MS  PhD 《Veterinary surgery : VS》2015,44(5):603-612

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Stable isotope analysis reveals ontogenetic migration and the importance of a large mangrove estuary as a feeding ground for juvenile John’s snapper <Emphasis Type="Italic">Lutjanus johnii</Emphasis>     

Katsuhisa Tanaka  Yukio Hanamura  Ving Ching Chong  Satoshi Watanabe  Alias Man  Faizul Mohd Kassim  Masashi Kodama  Tadafumi Ichikawa 《Fisheries Science》2011,77(5):809-816

Stable carbon (δ¹³C) and nitrogen (δ¹⁵N) isotope ratios were measured to investigate the migration of John’s snapper Lutjanus johnii and its dependence on the food resources provided within the large Matang Mangrove Forest Reserve (40,151 ha), Malaysia. John’s snapper, and its main prey food such as penaeids, Acetes shrimps and mysids, showed generally depleted δ¹³C values in the inner mangrove area but more enriched values in the river mouth and coastal area. Some juveniles migrated into the inner mangrove areas, although they were also distributed near the river mouth areas. Isotopic signatures of snapper fish and prey reveal the ontogenetic migration of the youngest juvenile fish (<5 cm in total length) from the coastal area into the mangrove area, shifting their dependence from the coastal food web to the inner mangrove food web with their growth. The study shows the importance of the complex interconnected mangrove waterways and associated prey animals present in the large mangrove system to juvenile John’s snapper.  相似文献   

Dietary administration of astaxanthin improves feed utilization,growth performance and survival of Asian seabass,Lates calcarifer (Bloch, 1790)     

Keng Chin Lim  Fatimah Md. Yusoff  Mohamed Shariff  Mohd. Salleh Kamarudin 《Aquaculture Nutrition》2019,25(6):1410-1421

This study was undertaken to assess the impacts of dietary astaxanthin supplementation on growth performance, feed utilization, survival, and serum growth hormone (GH) availability of Asian seabass, Lates calcarifer, with special reference to dose–response relationships and variations during different feeding phases (short‐term, medium‐term and long‐term). Fish were fed the following diets in triplicate for 90 days: the control (CD), AX50 (50 mg astaxanthin/kg diet), AX100 (100 mg astaxanthin/kg diet) and AX150 (150 mg astaxanthin/kg diet). The findings revealed that fish exhibited significant linear increments (p < .05) in specific growth rate (SGR), weight gain, feed utilization efficiency and survival when fed various diets with escalating levels of astaxanthin. Supplementation with dietary astaxanthin significantly augmented (p < .05) GH levels in fish. Significant positive associations (p < .05) were observed between circulating serum GH levels and SGR of fish from all groups following three consecutive feeding phases, denoting a robust cause‐and‐effect relationship. Circulating GH concentrations were considered as a sensitive biomarker of growth performance in Asian seabass. This study illustrated that supplemental astaxanthin could be administered in culture protocols to improve the growth rate and commercial hatchery production of Asian seabass, and possibly other teleost species.  相似文献