Publications

assessing copper thresholds for phytotoxicity and potential dietary toxicity in selected vegetable crops.	copper pollution in soils is widespread, and its accumulation in crop products could pose a risk on human health. in this paper, bioavailability of added copper (cu) and critical cu concentrations in a vegetable garden soil was evaluated for chinese cabbage (brassica chinensis l.), pakchoi (brassica chinensis l.), and celery (apiumg graveolens l. var. dulce dc) based on human dietary toxicity. the availability of added cu in the soil decreased with incubation time, and had minimal change after 1 ...	2002	12403270
activation of antigen-presenting cells by immunostimulatory plant dna: a natural resource for potential adjuvant.	genomic dna sequences (bacteria, insect, nematodes and molluscs) or synthetic oligodeoxynucleotides (odn) containing unmethylated cpg motifs (cpg-dna/odn) are regarded as promising candidates for new medical adjuvants for their ability to stimulate the mammalian immune system and enhance immune responses to specific antigens. here, we first report the immunostimulatory activity of total genomic dna from two plants, brassica chinensis l. and zea may, the cpg methylation status of which is incompl ...	2002	12034103
evaluation of major constraints to revegetation of lead/zinc mine tailings using bioassay techniques.	the residues from the extraction of lead/zinc (pb/zn) ores of most pb/zn mines are permanently stored in tailings ponds, which require revegetation to reduce their environmental impact. this can only be done if the main constraints on plant establishment are evaluated. this can readily be done by field and greenhouse studies. to test this, the properties of different tailings from lechang pb/zn mine located at the north of guangdong province in southern china have been studied. physical and chem ...	2002	12137044
[agricultural application of sludge dredged from landscape water bodies].	the feasibility and ecological effects of agricultural application of sludge dredged from the grand canal (hangzhou section) were studied. applied too much dredged sludge to red soil and paddy soil affected the germination of alpine fescue [fescuta ovina var. brachyphylla (schult.) piper] and colver (trifolium repens. l) seeds, while there wasn't significantly affects in pot experiment. while the application rate was lower than 270 t.hm-2, the growth of pakchoi (brassica chinensis l.) increased ...	2002	12132166
phytotoxicity of dredged sediment from urban canal as land application.	phytotoxicity of dredged sediment from hangzhou section of the grand canal as land application was evaluated by pakchoi (brassica chinensis l.) germination tests and pot experiments. germination rates of pakchoi in the dredged sediment and in sediment-applied soils were both significantly higher than that in the soil controls, while the germination rate between the sediment-applied soils was no significant difference. in pot experiments, plant height and biomass were increased by the dredged sed ...	2002	11916038
toxicity evaluation of sewage sludges in hong kong.	anaerobically digested sewage sludges collected from four wastewater treatment plants located in sha tin, tai po, yuen long, and shek wu hui in hong kong were subjected to chemical characterization and toxicity testing to provide preliminary assessment of their suitability for land application. all sewage sludges were slightly alkaline with ph range of 8.3-8.7. electrical conductivity (ec; 0.69 ds m(-1)) and soluble nh4-n content (996 mg kg(-1)) of sewage sludge from yuen long were lower than th ...	2001	11757851
[reclamation of the plant regeneration efficiency of brassica campestris subsp. chinensis var.parachinensis].	this investigation has developed an efficient and fast method for plant regeneration from petiole of cotyledon explants of brassica campestris l. subsp. chinensis makino var. parachinensis tsen et lee. a medium was designed for b. campestris subsp. chinensis var. parachinensis to obtain the high frequency of shoot regeneration, which contained bap 2 mg/l, naa 0.75-1.0 mgl and 7.5 mg/l agno3 solution to the half of nh4+ concentration's ms basic medium. 60 ml/l coconut milk were added to all of me ...	2001	12549111
[study on activity of inner inhibitory substances of acanthopanax senticosus (rupr. et maxim) harms fruits and seeds].	by studying on the inner inhibitory substances of acanthopanax senticosus fruits and seeds, the reason for dormancy of the seeds was investigated.	2001	12776367
sequence analysis shows that ribgrass mosaic virus shanghai isolate (rmv-sh) is closely related to youcai mosaic virus.	the complete nucleotide sequence of an isolate of ribgrass mosaic virus (rmv-sh) from brassica chinensis (qingcai) in shanghai, china was determined. the genome consisted of 6301 nucleotides and its genomic organization was similar to those of other crucifer-tobamoviruses. comparisons of the nucleotide and predicted amino acid sequences and phylogenetic analyses showed that rmv-sh had very high homology (> 95% identical nucleotides and 97.7-99.6% identical amino acids) to a sequence of youcai mo ...	2001	11504428
effect of applying hong kong biosolids and lime on nutrient availability and plant growth in an acidic loamy soil.	a greenhouse experiment was conducted to evaluate the growth of brassica chinensis l. in an acidic loamy soil amended with municipal biosolids with or without lime treatment (750 mg kg(-1)). the soil was amended with one of two municipal biosolids from tai po (tp) or yuen long (yl) wastewater treatment plants at application rates of 0, 5, 10, 25 and 50% (v/v). initial nh(+)4-n and po(3-)4-p concentrations in the amended soil increased with an increase in municipal biosolids loading rates and tho ...	2001	11873884
chemoprevention of 2-amino-1-methyl-6-phenyli-midazo 4,5-b pyridine-induced carcinogen-dna adducts by chinese cabbage in rats.	aim:the food-borne carcinogen 2-amino-1-methyl-6-phenylimidazo 4,5-b pyridine (phip) induces colon and mammary gland tumors in rats and has been implicated in the etiology of human colorectal cancer.this study was conducted to examine the potentially preventive effect of chinese cabbage (brassica chinensis),a brassica vegetable most commonly consumed in china, against this carcinogen-induced dna adduct formation in rats and its possible mechanisms.methods:sprague-dawley rats were maintained for ...	1999	11819413
[preliminary studies on tissue culture and agrobacterium-medicated transformation of brassica campestris ssp. chinensis].	the hypocotyls and cotyledons of the asepetic seedling of brassica campestris ssp. chinensis l cv. pudongaijiecai) were used as explants for tissue culture. adventitious buds were differentiated on modified ms medium supplemented with tdz 1-2 mg/l, naa 0.2-1 mg/l and agno3 7.5 mg/l. the percentage of explants which formed buds of cotyledons was about 56%, and that of hypocotyls was about 37%. when the regenerated explants were transferred onto ms medium with 2 i.p. 5 mg/l and naa 0.1 mg/l for tw ...	1999	12548800
foliar modifications induced by inhibition of polar transport of auxin.	the effects of auxin polar transport inhibitors, 9-hydroxy-fluorene-9-carboxylic acid (hfca); 2, 3, 5-triiodobenzoic acid (tiba) and trans-cinnamic acid (ca) on leaf pattern formation were investigated with shoots formed from cultured leaf explants of tobacco and cultured pedicel explants of orychophragmus violaceus, and the seedlings of tobacco and brassica chinensis. although the effective concentration varies with the inhibitors used, all of the inhibitors induced the formation of trumpet-sha ...	1999	10321686
identification and characterization of the inward k+ channel in the plasma membrane of brassica pollen protoplasts.	patch clamp techniques have been used to identify and characterize the whole-cell currents carried by inward k+ channels in isolated matured pollen protoplasts of brassica chinensis var. chinensis. the whole-cell inward currents in the isolated pollen protoplasts were activated at hyperpolarized membrane potentials more negative than -100 mv. the magnitudes of the whole-cell inward currents were strongly dependent on the external k+ concentration, and were highly selective for k+ over other mono ...	1999	10555306
[chemoprevention of 2-amino-1-methyl-6-phenylimidazo[4,5-b] pyridine-induced carcinogen-dna adducts by chinese cabbage in rats].	to examine the preventive effect of chinese cabbage (brassica chinensis) against colon carcinogen 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (phip)-induced phip-dna adduct formation in rats and its possible mechanism.	1998	10920929
assessment of the transfer of 137cs in three types of vegetables consumed in hong kong.	a dynamic food chain model has been built for the modeling of the transfer of 137cs in three types of vegetables consumed in hong kong, namely, white flowering cabbage (brassica chinensis), head lettuce (lactuca sativa) and celery (apium graveolens). some parameters have been estimated from the experimental data obtained in this work. the experimental data include the transfer factors of 137cs from soil to the different vegetable species which are determined through high resolution gamma spectro ...	1998	9745700
responses of some common cruciferae to root-knot nematodes.	ten cultivated plants of the family cruciferae were evaluated for susceptibility to meloidogyne arenaria race 1, m. incognita races 1 and 3, and m. javanica in a series of four separate greenhouse tests. after 62-64 days, or 1,032-1,072 degree days (10 c base), several of the crops evaluated showed moderate to severe levels of galling (> 3.0 on 0-5 scale) and moderate numbers of egg masses (>2.0 on 0-5 scale) in response to each of the nematode species and races. among the plants tested, collard ...	1995	19277321
studies of the biosynthesis of tentoxin by alternaria alternata.	biosynthesis of the phytotoxin, tentoxin, its regulation and the enzymic synthesis steps were studied in vivo and in vitro. the physiology of biosynthesis of tentoxin in vivo was investigated by using sections of mycelial mats incubated in buffer. differentiated mycelia could be studied under defined conditions. the de novo synthesis of tentoxin was measured by incorporation of [u-14c]leucine into tentoxin. the investigation system was stable for 10 h. biosynthesis and the growth of biomass star ...	1994	7881545
brassinosteroid stimulation of hypocotyl elongation and wall relaxation in pakchoi (brassica chinensis cv lei-choi).	hypocotyl elongation of pakchoi (brassica chinensis cv lei-choi) was stimulated by applying 300 ng of brassinosteroid (2[alpha],3[alpha],22[beta],23[beta]-tetrahydroxy-24[beta]-methyl-b-homo-7- oxa-5[alpha]-cho-le stan-6-one, br) in 1 [mu]l of 50% ethanol to the apex of hypocotyls. br had its greatest effect on elongation of the apical 3-mm region below the cotyledonary node (75% stimulation) between 6 and 18 h after treatment. stress/strain (instron) analysis of this 3-mm region revealed that p ...	1993	12231748
decontamination of landfill leachate by soils with different textures.	soils with different textures (sandy, loamy, and clay soils) were used as filters to attenuate leachate from the gin drinkers' bay landfill. they were used to pack columns of different depths: 0.2, 0.6, and 1.0 m. eight millimeters of leachate was drained into the soil columns each day for 56 days. the percolated leachates were collected weekly and their properties analyzed. it was revealed that the properties became rather stable at day 28 and therefore only the data from day 28 are presented. ...	1990	2096848
toxicity tests of soil contaminated by recycling of scrap plastics.	the present investigation studied the toxicity of soil contaminated by untreated discharge from a factory that recycles used plastics. the nearby agricultural areas and freshwater fish ponds were polluted with high concentrations of cu, ni, and mn. water extracts from the contaminated soil retarded root growth of brassica chinensis (chinese white cabbage) and cynodon dactylon (bermuda grass) where their seeds were obtained commercially. the contaminated populations of c. dactylon, panicum repen ...	1990	2331327
decontamination of landfill leachate by soil infiltration.	a soil column study was conducted to evaluate the efficiency of soil to attenuate pollutants in landfill leachate. it was found that more than 60% of the initial alkalinity, cod, and total nitrogen was removed after the leachate had percolated through the soil column. lower efficiencies were observed for the removal of dissolved cations, ammonia nitrogen, and nitrate nitrogen. when previously percolated leachate was recirculated through the soil column, significant removal (93.6%) of ammonia nit ...	1989	2604902
gradients of intercellular co(2) levels across the leaf mesophyll.	most current photosynthesis models, and interpretations of many wholeleaf co(2) gas exchange measurements, are based on the often unstated assumption that the partial pressure of co(2) is nearly uniform throughout the airspaces of the leaf mesophyll. here we present measurements of co(2) gradients across amphistomatous leaves allowed to assimilate co(2) through only one surface, thus simulating hypostomatous leaves. we studied five species: eucalyptus pauciflora sieb. ex spreng., brassica chinen ...	1988	16666027
simultaneous measurements of steady state chlorophyll a fluorescence and co(2) assimilation in leaves: the relationship between fluorescence and photosynthesis in c(3) and c(4) plants.	rates of co(2) assimilation and steady state chlorophyll a fluorescence were measured simultaneously at different intercellular partial pressures of co(2) in attached cotton (gossypium hirsutum l. cv deltapine 16) leaves at 25 degrees c. electron transport activity for co(2) assimilation plus photorespiration was calculated for these experiments. under light saturating (1750 microeinsteins per square meter per second) and light limiting (700 microeinsteins per square meter per second) conditions ...	1986	16664735
intracellular location of carbonate dehydratase (carbonic anhydrase) in leaf tissue.	two proteins which have carbonate dehydratase (carbonic anhydrase, ec 4.2.1.1) activity were shown to be in the chloroplasts and in the cytosol of leaves of brassica chinensis, spinacia oleracea, and in variegated leaves of tradescantia albiflora and hedera canariensis. the chloroplastic enzyme is smaller than the one in the cytosol, as it runs farther on gradient polyacrylamide gels. it was separated from the other by isolation of chloroplasts of brassica and spinacia on sucrose density gradien ...	1979	16660683
cysteine synthase from rape leaves.	cysteine synthase [o-acetyl-l-serine acetate-lyase (adding hydrogen-sulfide) ec 4.2.99.8] has been highly purified from the extract of rape, brassica chinensis var. komatsuna. the purified preparation appeared to be homogeneous on sephadex g-100 gel filtration and dodecylsulfate-polyacrylamide gel electrophoresis, showing a molecular weight of about 62,000. the latter method also suggested that this enzyme was composed of two identical subunits. the enzyme contained 2 moles of pyridoxal phosphat ...	1975	1158855
the effects of gelatin on aggregation of protoplasts from higher plants.	aggregation of protoplasts of allium fistulosum l., brassica chinensis l. and daucus carota l. was induced in great frequency with gelatin and early products of gelatin degradation. the optimal gelatin concentration was 2-5%. the aggregated protoplasts fused into groups and cell walls were formed around them in culture.	1973	24458819
[comparative analysis of chloroplasts isolated from healthy and turnip yellow mosaic virus-infected brassica chinensis plants].		1972	5034445
composite of pah-degrading endophytic bacteria reduces contamination and health risks caused by pahs in vegetables.	vegetables accumulate polycyclic aromatic hydrocarbons (pahs) at high concentrations when grown in contaminated sites. inoculation with pah-degrading endophytic bacteria (ebpah) has been recognized as one of the most promising ways to remove pahs from plant bodies; however, the performance of single endophytic bacteria is generally limited. this investigation used a composite of eight ebpah to reduce the contamination and health risk posed by 16 epa priority pahs in vegetables including chinese ...	0	28448936
effects of glucose on the uptake and metabolism of glycine in pakchoi (brassica chinensis l.) exposed to various nitrogen sources.	plants can absorb amino acids as a nitrogen (n) source, and glucose is an important part of root rhizodeposition and the soil sugar pool, which participates in the regulation of plant growth and uptake. in pakchoi, the effect of glucose concentration on the glycine n uptake from a nutrient mixture composed of glycine, ammonium, and nitrate, or from a single n solution of glycine alone was studied using specific substrate (15)n-labeling and (15)n-gas chromatography mass spectrometry.	0	28253854
slow-release nitrogen fertilizers can improve yield and reduce cd concentration in pakchoi (brassica chinensis l.) grown in cd-contaminated soil.	cadmium (cd) pollution in vegetable crops has become a serious problem in recent years. owing to the limited availability of arable land resources, large areas of cd-contaminated lands are inevitably being used for the production of vegetables, posing great risks to human health via the food chain. however, strategies to improve yield and reduce cd concentration in crops grown in contaminated soils are being developed. in the present study, using pot experiments, we investigated the effects of t ...	0	27677996
improved discrimination for brassica vegetables treated with agricultural fertilizers using a combined chemometric approach.	multielement and stable isotope (δ(13)c, δ(15)n, δ(2)h, δ(18)o, (207)pb/(206)pb, and (208)pb/(206)pb) analyses were combined to provide a new chemometric approach to improve the discrimination between organic and conventional brassica vegetable production. different combinations of organic and conventional fertilizer treatments were used to demonstrate this authentication approach using brassica chinensis planted in experimental test pots. stable isotope analyses (δ(15)n and δ(13)c) of b. chinen ...	0	27355562
extracts of tsai tai (brassica chinensis): enhanced antioxidant activity and anti-aging effects both in vitro and in caenorhabditis elegans.	tsai tai is one of the most widely consumed brassica vegetables in asian countries because of its good taste and its nutritional benefits. this study evaluated the antioxidant capacity and possible associated health benefits of 3 tsai tai (brassica chinensis) varieties, namely, hon tsai tai, pak choi and choi sum. the dpph radical scavenging ability and reducing power assays were performed to evaluate the in vitro activities of the extracts. caenorhabditis elegans was used as an in vivo model fo ...	0	26726147
[residue and degradation of roxarsone in the system of soil-vegetable].	the field experiment was developed for simulating the residues, transformation and degradation in soil-vegetable system of roxarsone contained in organic fertilizer. under the treatment, the yield of brassica chinensis decreased in low roxarsone concentration with a decline by 15% to 32% compared with the control group; there had an accumulating role of vegetables to arsenic, and the root was the main part; total content of arsenic in the soil was positively correlated with the dose of the appli ...	0	26592042
dissipation and distribution of chlorpyrifos in selected vegetables through foliage and root uptake.	dissipation, distribution and uptake pathways of chlorpyrifos were investigated in pakchoi (brassica chinensis l.) and lettuce (lactuca sativa) with foliage treatments under a greenhouse trial and root treatments under a hydroponic experiment. the dissipation trends were similar for chlorpyrifos in pakchoi and lettuce with different treatments. more than 94% of chlorpyrifos was degraded in the samples for both of the vegetables 21 days after the foliage treatments. for the root treatment, the di ...	0	26363321