19 Result(s)

Article

A biochemical mechanism for the conversion of thiophanate-methyl into methyl benzimidazol-2-YL carbamate (MBC) in plant tissue

Thin slices of potato tuber greatly accelerated the conversion of thiophanatemethyl into MBC. This was also observed when thiophanate-methyl was incubated with homogenates of apple, potato or with sap pressed ...

J. W. Vonk, B. Mihanović, A. Kaars Sijpesteijn in Netherlands Journal of Plant Pathology (1977)

Article

Antifungal activity of the systemic fungicide imazalil

The antifungal activity of imazalil against spores of Penicillium italicum and several other fungi was found to be pH-dependent. The fungicide was much less effective at pH 5.2 than at pH 7.0. However, related...

M. R. Siegel, A. Kerkenaar, A. Kaars Sijpesteijn in Netherlands Journal of Plant Pathology (1977)

Article

On the mode of action of prothiocarb

Prothiocarb, S-ethyl-N-(3-dimethy laminopropyl) thiocarbamic acid hydrochloride, a fungicide active against Oomycetes, possesses two modes of action. Its most common action is caused by the entire prothiocarb ...

A. Kerkenaar, A. Kaars Sijpesteijn in Netherlands Journal of Plant Pathology (1977)

Article

Differences in disc gel electrophorese pattern of soluble proteins excreted by different physiological races and isolates of Cladosporium fulvum

The extracellular soluble proteins of 15 different isolates comprising 9 different physiological races ofCladosporium fulvum were harvested from 3 to 4 weeks old shake cultures. The culture filtrates were purifie...

A. Van Dijkman, S. J. Dieleman… in Netherlands Journal of Plant Pathology (1973)

Article

A biochemical mechanism for the gene-for-gene resistance of tomato to Cladosporium fulvum

Model experiments were carried out with the tomato varieties ‘Moneymaker’ (no resistance genes), ‘Leaf Mould Resister No. 1’ (resistance gene Cf 1), ‘Vetomold’ (resistance gene Cf 2) and ‘V 473’ (resistance ge...

A. Van Dijkman, A. Kaars Sijpesteijn in Netherlands Journal of Plant Pathology (1971)

Article

A biochemical mechanism of natural resistance of apple to Venturia inaequalis

In cultuurfiltraten vanVenturia inaequalis, de verwekker van appelschurft, werden stoffen gevonden die toxisch zijn voor blad van appelrassen welke tegen dit physio resistent zijn. Blad van vatbare rassen is onge...

J. Raa, A. Kaars Sijpesteijn in Netherlands Journal of Plant Pathology (1968)

Article

Studies on the mode of action of phenylthiourea, a chemotherapeutant for cucumber scab

In sap of cucumber plants treated with phenylthiourea (PTU) the concentration of this compound was too low to explain protection againstCladosporium cucumerinum by the fungitoxic action of this compound. The sap ...

A. Kaars Sijpesteijn, H. D. Sisler in Netherlands Journal of Plant Pathology (1968)

Article

Pentobarbital Sodium Salt, a Systemic Agent for Control of Powdery Mildew of Cucumber

PHENOBARBITONE (phenobarbital) has been reported to control powdery mildew of marrow¹. During 1963 and 1964 we have tested a series of barbituric acid derivatives on powdery mildew of cucumber caused by Sphaeroth...

A. TEMPEL, A. KAARS SIJPESTEIJN in Nature (1967)

Article

On the antifungal and antibacterial activity of some trisubstituted organogermanium, organotin and organolead compounds

The antifungal and antibacterial activities of a number of acetates of trialkyl- and triphenyl-substituted germanium, tin and lead have been investigated. All three groups contain active as well as inactive co...

A. Kaars Sijpesteijn, F. Rijkens, J. G. A. Luijten… in Antonie van Leeuwenhoek (1962)

Article

New developments in the systemic combat of fungal diseases of plants

A survey is given of some recent developments in the field of the systemic combat of fungus diseases of plants. The stage of practical application has not yet been reached.

A. Kaars Sijpesteijn in Tijdschrift Over Plantenziekten (1961)

Article

On the mode of action of dialkyldithiocarbamates on moulds and bacteria

In the action of sodium dimethyldithiocarbamate on moulds and bacteria the formation of its 1∶1 and 1∶2 complexes with Cu⁺⁺ from the medium plays a decisive role. These Cu complexes on the whole have a higher tox...

A. Kaars Sijpesteijn, M. J. Janssen in Antonie van Leeuwenhoek (1959)

Article

Fungitoxic Action of 8-Hydroxyquinoline, Pyridine-N-oxide-2-thiol and Sodium Dialkyl-dithiocarbamates, and their Copper Complexes

IN a previous communication¹ on the mode of fungitoxic action on Aspergillus niger, we found that of the copper complexes of 8-hydroxyquinoline (oxine) and pyridine-N-oxide-2-thiol (PTO), the 1 : 2 complexes are ...

A. KAARS SIJPESTEIJN, M. J. JANSSEN in Nature (1958)

Article

Effect of Copper and Chelating Agents on Growth Inhibition of Aspergillus niger by 8-Hydroxyquinoline and Pyridine-N-Oxide-2-Thiol

WHEN examining the toxicity of chelating agents, we have to deal with the toxicity of each of three entities, namely, the chelating agent itself, the unsaturated complex(es) of metal and chelating agent, and t...

A. KAARS SIJPESTEIJN, M. J. JANSSEN, H. M. DEKHUYZEN in Nature (1957)

Article

A New Type of Plant Growth-regulating Substances

IN the course of systematic investigations of the dithiocarbamates, the compound S-(carboxymethyl)-dimethyldithiocarbamate, obtained by the rea...

G. J. M. VAN DER KERK, M. H. VAN RAALTE, A. KAARS SIJPESTEIJN, R. VAN DER VEEN in Nature (1955)

Article

Investigations on organic fungicides

l-Histidine was found to antagonize the toxicity of the fungicides tetramethylthiuram disulphide (T.M.T.D.), tetramethylthiuram monosulphide (T.M.T.M.) and sodium dimethyldithiocarbamate towardsBotrytis cinerea, ...

A. Kaars Sijpesteijn, G. J. M. Van der Kerk in Antonie van Leeuwenhoek (1952)

Article

Cellulose-decomposing bacteria from the rumen of cattle

A. Kaars Sijpesteijn in Antonie van Leeuwenhoek (1949)