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Biodegradation of methanol vapor in a biofilter

Journal of Environmental Sciences 2003年第5期15卷 691-696页

作者： Durai Arulneyam T.Swaminathan biotechnologyresearchcentre BiotechnologyResearchCentre DepartmentofChemicalEngineeringIndianInstituteofTechnologyMadrasChennai600036IndiaDepartmentofChemicalEngineeringIndianInstituteofTechnologyMadrasChennai600036India

Volatile organic compounds (VOCs) are a new class of air pollutants posing threat to the environment. Newer technologies are being developed for their control among which biofiltration seem to be most attractive. Biofiltration of methanol vapor from air stream was evaluated in this study. Experimental investigations were conducted on a laboratory scale biofilter, containing mixture of compost and polystyrene inert particles as the filter materials. Mixed consortium of activated sludge was used as an inoculum. The continuous performance of biofilter for methanol removal was monitored for different concentrations and flow rates. The removal efficiencies decreased at higher concentrations and higher gas flow rates. A maximum elimination capacity of 85 g/(m 3·h) was achieved. The response of biofilter to upset loading operation showed that the biofilm in the biofilters was quite stable and quickly adapted to adverse operational conditions.

关键词： biofilter methanol removal efficiency elimination capacity degradation

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Study of Embryo and Endosperm Development of Strawberry

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Journal of Northeast Agricultural University(English Edition) 1998年第1期5卷 59-64页

作者： LiDongmei LiZhaoliang 等 BeijingPlantCellBioengineeringLaboratory Beijing100081PRC biotechnologyresearchcentre CAASBeijing100081PRC

The fertilization and development process of embryo and endosperm of strawberry, Gelila snd Xiaoshi which were broadly cultivated in Harbin were investigated by optical microscopy、fluorescence microscopy and transmission electron microscopy. The papilla cells ranked in grid orid on its stigma and the flourishing transmitting tissue appeared in the center of its thin and long pistillary. There was only one crassinucellate hemianatropous ovule with Polygonum type embryo sac and single integument in each ovary. The germination of pollen and the pathway of pollen tube growth could be clearly observed with fluorescence microscopy: stigma→transmitting tissue in pistillary→intine of ovary placenta→the surface of ovule→micropyle. The development of embryo was consistent with most dicotyledons : zygote→2-cell proembryo→proembryo shaped like a ball→proembryo shaped like a heart→proembryo shaped like a torpedo→proembryo formed two cotyledons. The embryo was orthotropous and its development was asterad type. The endosperm development belonged to nuclear type as following: primary endosperm nucleus→free endosperm nucleus→endosperm cell→endosperm assimilated gradually by embryo. There was a special structure around it during the development of Gelila embryo.

关键词： strawberry embryo endosperm

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Anatomical Study an the Development of Strawberry Fruit

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Journal of Northeast Agricultural University(English Edition) 1999年第1期6卷 68-74页

作者： LiDongmei LiZhaoliang 等 BeijingPlantCellBioengineeringLaboratory Beijing100081PRC biotechnologyresearchcentre CAASBeijing100081PRC

The development of strawberry fruit, two cultivars-Gelila and Xiaoshi, was systematically studied by anatomical and embryological methods. The growth dynamics of fruit showed that the two cultivars performed similar changes with their fresh weight volume and structure, it included the first slow growth stage, the rapid growth stage and the second solw growth stage. The fruit was a typical polyachene with a ovule which belonged to a Poligonum type, the growth process of pollen tube from stigma to embryo sac was clearly observed by flourescence microscopy. Embryo development was similar to that of most dicotyls, and the mature embryo was orthotropous; Endosperm development was a nuclear type, and gradually disappeared with development:Seed coat consisted of 34 layer cells, and pericarp was composed of 68 layer cells which differentiated from ovary wall cell; The structure of receptacle was a typical stem which consisted of epidermis ,cortex and vascular cylinder. With development, the cortex an

关键词： strawberry development of fruit anatomyd pith of fruit contained plentiful parenchyma tissue and they were mainly edible sections.

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