Library Catalogue

Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104603
Title Vorming van thyllen in geveld beukenhout
show extra info.
door K. Ebes
Author(s) Ebes, K.
Publisher Wageningen : Veenman
Publication year 1937
Description 56 p ill
Notes Proefschrift Wageningen
Tutors Reinders, Prof. Dr. E.
Graduation date 1937-10-26
Dissertation no. 104
Author abstract show abstract
After felling, beech wood may form thyloses, blocking the xylem vessels, so that they can not be sufficiently impregnated with creosote. This decreases the durability and value of the wood for such purposes as railway sleepers. Ebes found that thyloses may be formed throughout the year through pits from wood ray cells next to the xylem vessels. Trials with small logs showed that thyloses appeared sooner at higher temperatures. After a loss of 40-45 % moisture no more thyloses appeared. Fresh uptake of moisture induced further thyloses, unless moisture dropped below about 60 %. Ebes confirmed Klein's observation (1923) that when water was pressed through a branch and air through one of its laterals, the branch developed no thyloses, while the lateral formed many. From this it was concluded that the penetration of air into the vessels caused formation of the thyloses.

To limit thyloses trees should be felled in a season with low temperatures, and drying of the timber should be encouraged by sawing the wood early. More experiments were needed to find how quickly railway sleepers dried.

Online full textINTERNET
On paper FORUM ; SPEC.COLL. ; A2096,1937,6
FORUM ; STACKS ; NN08202,104
Keyword(s) (cab) forestry / trees / wood anatomy / wood defects / abnormal development / fagus sylvatica
Categories Wood and Wood Products
Publication type PhD thesis
Language Dutch; Flemish
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