- Malacology, History of Malacology, Indo-Pacific Mollusca, Systematics (Taxonomy), Malacology (Archaeology), Food Sensory Analysis, and 15 moreSensory Analysis and Sensometrics, Odour Compounds, Flavours, Odour threshold, Molluscs, Malacology (Biology), Mediterranean Malacology, Mollusca, Bivalves, Gastropods, Taxonomy, Marine biodiversity, Molluscan taxonomy and nomenclature, Gastropoda Systematics, and Archaeomalacologyedit
The taxon Buccinim hepaticum has had different authors (and years), different locations of origin, different pictures of types and different synonyms. All of these are here discussed and it is finally suggested to consider this taxon a... more
The taxon Buccinim hepaticum has had different authors (and years), different locations of origin, different pictures of types and different synonyms. All of these are here discussed and it is finally suggested to consider this taxon a nomen dubium.
Research Interests: Malacology and Taxonomy
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Finds of Parvicardium trapezium and Afrocardium richardi (Bivalvia, Cardiidae) from the Israelian coast of the Mediterranean, with remarks about the genus Afrocardium. Shell grit samples from the Mediterranean coast of Israel have been... more
Finds of Parvicardium trapezium and Afrocardium richardi (Bivalvia, Cardiidae) from the Israelian coast of the Mediterranean, with remarks about the genus Afrocardium.
Shell grit samples from the Mediterranean coast of Israel have been examined, containing five Cardiidae species. Parvicardium trapezium is here reported for the first time from Israel and Afrocardium richardi for the second time. The genus Afrocardium is discussed. A. richardi exhibits large variations in shape, outline and coloration, but has a rather uniform rib number and rib sculpture. The same applies to its congeners, most of which the present status is doubtful. Its suggested life habit, i.e. byssally attached to a substratum, might be an explanation for this variability. However, this assumption has to be confirmed by the examination of living populations. Information is given about aberrations and the maximum size of A. richardi.
Shell grit samples from the Mediterranean coast of Israel have been examined, containing five Cardiidae species. Parvicardium trapezium is here reported for the first time from Israel and Afrocardium richardi for the second time. The genus Afrocardium is discussed. A. richardi exhibits large variations in shape, outline and coloration, but has a rather uniform rib number and rib sculpture. The same applies to its congeners, most of which the present status is doubtful. Its suggested life habit, i.e. byssally attached to a substratum, might be an explanation for this variability. However, this assumption has to be confirmed by the examination of living populations. Information is given about aberrations and the maximum size of A. richardi.
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Specimens of Sinum haliotoideum (Linnaeus, 1758) were recently collected in the Red Sea area, confirming an old report from the mid-1800s. The occurrence in the Red Sea is supported by records, both earlier and recent, from neighbouring... more
Specimens of Sinum haliotoideum (Linnaeus, 1758) were recently collected in the Red Sea area, confirming an old report from the mid-1800s. The occurrence in the Red Sea is supported by records, both earlier and recent, from neighbouring localities in the northern Indian Ocean. Thus, the northern Indian Ocean, including the Red Sea, has to be included in the geographical range of this species. Differences in opinion concerning conspecificity of Sinum haliotoideum with other species of Sinum described from the Indo-Pacific are discussed. S. planulatum (Récluz in Chenu, 1843) = S. planatum (Récluz in Chenu, 1843), S. planum (Philippi, 1844), S. gualterianum (Récluz, 1851), and S. weberi (Bartsch, 1918) are all junior synonyms of S. haliotoideum (Linnaeus, 1758). S. fuscum (Röding, 1798), S. sinuatum (Récluz, 1851), S. lacteum (Récluz, 1851), Ectosinum pauloconvexum Iredale, 1931, and S. diauges Kilburn, 1974 are distinct from S. haliotoideum. The status of S. indicum (Gray, 1828) remains uncertain as the type material is probably lost.
Research Interests: Malacology and Taxonomy
Christiaens had a thorough knowledge of malacological literature, especially of limpets. Several examples are given of his interest in publications on molluscs. The bibliography of Jos Christiaens comprises 62 publications.
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The trochoidean gastropod family Liotiidae Gray, 1850 and its type genus Liotia Gray, 1842 are well established (e.g., Bouchet et al., 2017: 142), but this raises a question about the status of the overlooked family name Liotinidae... more
The trochoidean gastropod family Liotiidae Gray,
1850 and its type genus Liotia Gray, 1842 are well
established (e.g., Bouchet et al., 2017: 142), but this
raises a question about the status of the overlooked
family name Liotinidae Nomura, 1932 with the type
genus Liotina Fischer, 1885. My critical literature
survey found a need to amend the authorship of the
genus name Liotina and the spelling of its type taxon
as well as to discuss the availability of the family
name Liotinidae from the nomenclatural point of
view, as given in the following lines.
1850 and its type genus Liotia Gray, 1842 are well
established (e.g., Bouchet et al., 2017: 142), but this
raises a question about the status of the overlooked
family name Liotinidae Nomura, 1932 with the type
genus Liotina Fischer, 1885. My critical literature
survey found a need to amend the authorship of the
genus name Liotina and the spelling of its type taxon
as well as to discuss the availability of the family
name Liotinidae from the nomenclatural point of
view, as given in the following lines.
Research Interests: Malacology and Taxonomy
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Inleiding In april en begin mei 2002 hebben we enkele plaatsen langs de kust van Vietnam bezocht om schelpen te verzamelen. We begonnen onze reis met een kort verblijf in Ho Chi Minh City. Met een gids diverse musea, tempels en markten... more
Inleiding In april en begin mei 2002 hebben we enkele plaatsen langs de kust van Vietnam bezocht om schelpen te verzamelen. We begonnen onze reis met een kort verblijf in Ho Chi Minh City. Met een gids diverse musea, tempels en markten bezocht. Ik denk niet dat we zonder gids overal hadden durven binnenstappen. Een aardige man die met geen enkel woord begon over Ho Chi Minh, hoewel we meerdere malen zijn portret, buste en standbeeld zijn tegengekomen. Daarna hebben we ons naar een hotel ergens tussen Phan Tiet en Mui Ne laten rijden. We hebben toen intens kennis gemaakt met het verkeer en de daarbij behorende ongeschreven wetten. Daardoor was de rit naar Nha Trang ongeveer een week later best te doen. Van Nha Trang naar Da Nang gevlogen (Engelse bemanning en een moderne Airbus), en daaropvolgend een korte rit naar het strand van Hoi An. Tenslotte weer terug gevlogen naar Ho Chi Minh City. De laatste dag in Vietnam hebben we gebruikt voor het kopen van souvenirs. Er zijn echt hele mooie dingen te koop (zie bijv. www.vietnam-art-craft.com). Allereerst wordt informatie gegeven over het verkeer in Vietnam. Daarna worden de drie locaties aan de kust beschreven, Phan Tiet/Mui Ne, Nha Trang en Hoi An, waar schelpen verzameld zijn. Tot slot wordt een overzicht van de circa 570 tot nu toe op naam gebrachte soorten per locatie gegeven. Ongeveer 100 soorten zijn nog niet geïdentificeerd. Het verkeer in Vietnam Het verkeer wordt, zowel in de steden als op de grotere verbindingswegen tussen de steden, gedomineerd door brommers. Vooral jongeren gebruiken dit vervoermiddel. Hierbij zijn de meisjes en vrouwen vermomd als bankrovers. Om vooral maar niet te bruin te worden, wordt het gezicht tot net onder de ogen afgedekt (met daarboven een petje of een hoedje) en worden de beide armen met lange handschoenen (met een hoog Doris-Day gehalte) tot aan de korte mouwtjes tegen de zon beschermd. Het arbeidsethos van het communisme is duidelijk niet algemeen geaccepteerd. Op de snelwegen tussen de steden is voor het lokale verkeer aan beide zijden van de enkele asfaltweg een ongeveer één meter breed stuk gereserveerd. Links of rechts is voor dit type verkeer niet relevant. En één brommer kan een heel gezin-vader, moeder en een paar kinderen-met een deel van het huisraad makkelijk vervoeren. De rest van de weg, met uitzondering van een smalle strook in het midden, wordt gebruikt door de vele brommers. Voor auto's blijft dus alleen het midden van de weg over. En dat voor beide kanten. Maar goed dat er geen middenbermbeveiliging is.
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A sinistral Ancilla minima Thiele, 1925 has been found in November 2011 at Zanzibar. Finds during the same trip of other Ancilla and Oliva species are discussed in relation to the literature. With the exception of two deep-water Ancilla... more
A sinistral Ancilla minima Thiele, 1925 has been found in November 2011 at Zanzibar. Finds during the same trip of other Ancilla and Oliva species are discussed in relation to the literature. With the exception of two deep-water Ancilla species, the four Ancilla species, i.e. A. exigua sulcata, A. sarda, A. minima and A. ventricosa, reported from Zanzibar by Kilburn (1981) in his revision on the genus Ancilla Lamarck, 1799 have been found too. These four Ancilla species are figured.
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Abstract: Very recently a review of the Haliotidae of the Sultanate of Oman and neighbouring countries was published, with the description of a new haliotid, Haliotis arabiensis Owen, Regter & Van Laethem, 2016. This species was... more
Abstract: Very recently a review of the Haliotidae of the Sultanate of Oman and neighbouring countries was published, with the description of a new haliotid, Haliotis arabiensis Owen, Regter & Van Laethem, 2016. This species was considered to be extremely rare on intertidal and beach communities. However, in a not so much later paper (Owen & Regter, 2016) additional finds were presented. Here, more finds and photographs from the literature of H. arabiensis are reported. Comments on the biogeographical distribution of H. mariae Wood, 1828 are presented too.
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Who is going to Lebanon of all places to collect shells? Summary After a short introduction a chronological survey is given of the literature specifically addressing the marine Mollusca of Lebanon. During two short holidays shells were... more
Who is going to Lebanon of all places to collect shells?
Summary After a short introduction a chronological survey is given of the literature specifically addressing the marine Mollusca of Lebanon. During two short holidays shells were collected at the coast of Lebanon. Due to insufficient knowledge of the local conditions only 56 species were collected, of which 14 are lessepsian. All species are already known from Lebanon. A nice surprise was the finding of kitchen waste from a restaurant at the sea side. This waste contained many empty shells of Spondylus spinosus, sold as “coquilles St. Jacques”, and to a lesser extent limpets (Cellana rota, Patella caerulea, P. ulyssiponensis and probably also P. rustica).
Summary After a short introduction a chronological survey is given of the literature specifically addressing the marine Mollusca of Lebanon. During two short holidays shells were collected at the coast of Lebanon. Due to insufficient knowledge of the local conditions only 56 species were collected, of which 14 are lessepsian. All species are already known from Lebanon. A nice surprise was the finding of kitchen waste from a restaurant at the sea side. This waste contained many empty shells of Spondylus spinosus, sold as “coquilles St. Jacques”, and to a lesser extent limpets (Cellana rota, Patella caerulea, P. ulyssiponensis and probably also P. rustica).
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Correction: Triton, no. 27 (2013): 8
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erratum: Spirula, no. 393: 109
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In the 'Festschrift' in honour of Rob Moolenbeek (Basteria 80(1-3): 2016) a list of his malacological publications was missing. This article presents a survey of his approximately 250 books and articles on malacology.
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Karl Brancsik (1842‒1915), from Slovakian origin, had an extensive collection of beetles, molluscs and plants. The molluscan collection, including type specimens, was almost completely destroyed during the Hungarian Revolution of 1956.... more
Karl Brancsik (1842‒1915), from Slovakian origin, had an extensive collection of beetles, molluscs and plants. The molluscan collection, including type specimens, was almost completely destroyed during the Hungarian Revolution of 1956. Five new marine molluscan species were described by him in two publications (Brancsik, 1891a; 1895). Three taxa have already been regarded as junior synonyms; the other two are considered conspecific with earlier described species in this paper. Thus all five new species from Brancsik are junior synonyms.
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In the malacological literature both " Tapparone-Canefri " and " Tapparone Canefri " (thus with a hyphen or a space between the two parts of his surname) are used. Based on information from himself and from those who knew him well, it is... more
In the malacological literature both " Tapparone-Canefri " and " Tapparone Canefri " (thus with a hyphen or a space between the two parts of his surname) are used. Based on information from himself and from those who knew him well, it is concluded that his name is spelled with a space, thus Tapparone Canefri. His bibliography is presented in the annex.
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A stumbling stone for Elly Koperberg (1897-1943) Summary. In memory of the Jewish sisters Elly (Ella Julia) and Kittie (Catharina Helmina) Koperberg, stumbling stones were placed on in the pavement in front of their house, Domstraat 9 in... more
A stumbling stone for Elly Koperberg (1897-1943)
Summary. In memory of the Jewish sisters Elly (Ella Julia) and Kittie (Catharina Helmina) Koperberg, stumbling stones were placed on in the pavement in front of their house, Domstraat 9 in Utrecht, where they lived just before being expelled and murdered in the extermination camp Sobibor. Elly Koperberg published in 1931 her Ph.D. thesis ‘Jungtertiäre und Quartäre Mollusken von Timor’. Two quotes are given from letters of Elly regarding the persecution of Jews in the Netherlands during WWII. In the first one (30 November 1940) she shows her solidarity with the fired Jewish professors and teachers of the University of Utrecht and in the second one (5 July 1942) she writes about the possibility of being killed and of the impossibility, due to travel restrictions, to finish her work. Elly Koperberg is the only malacological author killed by the Nazis. The names of Elly and Kittie are also placed on a plaque in the Utrecht University Hall, revealed 4 May 2011, in memory of all students, professors and staff who became victims of WWII.
Summary. In memory of the Jewish sisters Elly (Ella Julia) and Kittie (Catharina Helmina) Koperberg, stumbling stones were placed on in the pavement in front of their house, Domstraat 9 in Utrecht, where they lived just before being expelled and murdered in the extermination camp Sobibor. Elly Koperberg published in 1931 her Ph.D. thesis ‘Jungtertiäre und Quartäre Mollusken von Timor’. Two quotes are given from letters of Elly regarding the persecution of Jews in the Netherlands during WWII. In the first one (30 November 1940) she shows her solidarity with the fired Jewish professors and teachers of the University of Utrecht and in the second one (5 July 1942) she writes about the possibility of being killed and of the impossibility, due to travel restrictions, to finish her work. Elly Koperberg is the only malacological author killed by the Nazis. The names of Elly and Kittie are also placed on a plaque in the Utrecht University Hall, revealed 4 May 2011, in memory of all students, professors and staff who became victims of WWII.
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Frigidocardium centumliratum (Melvill in Melvill & Standen, 1907), F. helios ter Poorten & Poutiers in ter Poorten, 2009, and F. kiranum Sakurai & Habe, 1966, are for the first time reported from the Red Sea. Former Red Sea records of F.... more
Frigidocardium centumliratum (Melvill in Melvill &
Standen, 1907), F. helios ter Poorten & Poutiers in ter
Poorten, 2009, and F. kiranum Sakurai & Habe, 1966,
are for the first time reported from the Red Sea. Former
Red Sea records of F. exasperatum (G.B. Sowerby
II, 1839) and F. torresi (E.A. Smith, 1885) are considered
misidentifications and, lacking any other records,
are excluded from the Red Sea malacofauna. The type
material of F. centumliratum is a composite of three
species, hence a lectotype is designated to settle the
taxonomic confusion.
Standen, 1907), F. helios ter Poorten & Poutiers in ter
Poorten, 2009, and F. kiranum Sakurai & Habe, 1966,
are for the first time reported from the Red Sea. Former
Red Sea records of F. exasperatum (G.B. Sowerby
II, 1839) and F. torresi (E.A. Smith, 1885) are considered
misidentifications and, lacking any other records,
are excluded from the Red Sea malacofauna. The type
material of F. centumliratum is a composite of three
species, hence a lectotype is designated to settle the
taxonomic confusion.
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One fresh empty shell of Palmadusta lentiginosa (Gray, 1825) has been found on a beach at Batroun. This is very probably the first explicit record for Lebanon. Other cowries collected on the same beach are 40 shells of Purpuradusta... more
One fresh empty shell of Palmadusta lentiginosa (Gray, 1825) has been found on a beach at Batroun. This is very probably the first explicit record for Lebanon. Other cowries collected on the same beach are 40 shells of Purpuradusta gracilis notata (Gill, 1858) and two shells of Erosaria spurca (Linnaeus, 1758).
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Parashiela ambulata Laseron, 1956 is recorded from the Red Sea for the first time. Presently, three Parashiela species are recognized. These are P. ambulata Laseron, 1956, P. invisibilis (Hedley, 1899) and P. liddelliana (Hedley, 1907),... more
Parashiela ambulata Laseron, 1956 is recorded from the Red Sea for the first time. Presently, three Parashiela species are recognized. These are P. ambulata Laseron, 1956, P. invisibilis (Hedley, 1899) and P. liddelliana (Hedley, 1907), all three so far only known from the Pacific Ocean. Just two records of unidentified Parashiela species are known from the Indian Ocean.
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In an earlier article about the Stromboidea of the Red Sea, it was suggested by me that some of the more glamorous shells collected by Savigny, have been stolen. However, from the publications of Pallary about Savigny and his... more
In an earlier article about the Stromboidea of the Red Sea, it was suggested by me that
some of the more glamorous shells collected by Savigny, have been stolen. However,
from the publications of Pallary about Savigny and his collections, it appeared that this
assertion was wrong.
some of the more glamorous shells collected by Savigny, have been stolen. However,
from the publications of Pallary about Savigny and his collections, it appeared that this
assertion was wrong.
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This book is the result of a thorough search for original flavour threshold values of chemical compounds in the literature. It contains flavour threshold values for 2,160 compounds in water, 1,010 compounds in other media and 680... more
This book is the result of a thorough search for original flavour threshold values of chemical compounds in the literature. It contains flavour threshold values for 2,160 compounds in water, 1,010 compounds in other media and 680 peptides. In total 10,910 flavour threshold values are reported taken from 1,920 references.
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This book is the result of a thorough search in the literature for original odour threshold values of chemical compounds. It contains odour threshold values of 1,700 compounds in air, 1,860 compounds in water and 760 compounds in other... more
This book is the result of a thorough search in the literature for original odour threshold values of chemical compounds. It contains odour threshold values of 1,700 compounds in air, 1,860 compounds in water and 760 compounds in other media. In total 10,750 threshold values are reported taken from 1,780 references.
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Proficiency testing in sensory analysis is an important step towards demonstrating that results from one sensory panel are consistent with the results of other sensory panels. The uniqueness of sensory analysis poses some specific... more
Proficiency testing in sensory analysis is an important step towards demonstrating that results from one sensory panel are consistent with the results of other sensory panels. The uniqueness of sensory analysis poses some specific problems for measuring the proficiency of the human instrument (panel). Individuals within a panel and people from different cultures may have different thresholds of perception, and product experience of the panel may lead to differences in the ability to discriminate among samples. Such factors make the job of the sensory scientist and statistician more challenging, because of the difficulties in defining the expected level of performance. As part of an EU supported project, ProfiSens, 12 panels undertook descriptive profiling on six samples of red wine. Four were designated ‘validation’ panels, whose data were used firstly to establish the expected profile results, and secondly to set the performance criteria that a trained sensory panel would be expected to achieve. Four key measures of a panel’s performance were investigated: (1) the number of significant sensory dimensions identified by using generalised Procrustes analysis; (2) the number of pairs of samples that a panel found to be different at a specified level of significance; (3) how well the ‘sensory map’ of a panel agreed with the ‘expected sensory map’; and (4) how well the assessors agreed with each other within a panel, and with the consensus configuration. For each of these criteria, an ‘expected result’ was considered, as was an overall measure of performance. The data from the remaining eight panels were analysed, and the level of performance recorded for each of the stated criteria. Results indicated differing levels of performance. The study also revealed a number of key issues that need to be addressed to successfully run proficiency testing for descriptive profile analysis. A simpler performance scheme is proposed to address issues related to attaching arbitrary weightings to each of the performance criteria and to address potential problems associated with combining different measurement criteria into a single performance score. While some issues still need addressing, this project has made significant contributions to proficiency testing for sensory analysis.
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A trained panel developed a set of sensory attributes describing flavor, odor, mouth feel and after feel sensations elicited by commercially available vanilla custard desserts. Two main sensory dimensions, one running from “melting” to... more
A trained panel developed a set of sensory attributes describing flavor, odor, mouth feel and after feel sensations elicited by commercially available vanilla custard desserts. Two main sensory dimensions, one running from “melting” to “thick” and another one running from “rough” to “creamy-soft” could be recognized in the resulting sensory space. The commercial custard desserts were well distributed along the rough-creamy dimension but not along the melting-thick dimension. In a second study, model custards were used that varied in levels and type of thickener (carrageenan and starch) and fat content. This resulted in a better distribution of the custard desserts across the sensory space, and in a confirmation of the two main sensory dimensions. The melting-thick dimension was primarily related to thickener content and to the viscosity measured instrumentally. The rough-creamy/soft dimension was primarily related to fat content. High fat custards produced less sensations of dryness and roughness, more sensations of flavor, and more sensations of creamy and fatty mouth and after feel than their zero-fat containing counterparts. This was confirmed by PLS modeling that showed a good prediction of creamy/soft mouth feel sensations from a combination of flavor/taste sensations (creamy and fatty flavors and absence of bitter/chemical and sickly flavors), mouth feel sensations (thickness and fattiness) and after feel sensations (fatty coating and absence of roughness). It is argued that possible mechanisms by which fat affects the attributes that are part of this dimension include lubrication (friction) and flavor release.
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Texture and mouthfeel sensations of three groups of semisolid foodstuffs (mayonnaises and dressings, custard desserts and warm sauces) were characterised, measured, evaluated and compared based on quantitative descriptive sensory analysis... more
Texture and mouthfeel sensations of three groups of semisolid foodstuffs (mayonnaises and dressings, custard desserts and warm sauces) were characterised, measured, evaluated and compared based on quantitative descriptive sensory analysis of commercial products. Six groups of texture attributes were generated and used by the sensory panel. These were related to: viscosity, surface feel, bulk homogeneity, adhesion/cohesion, wetness-dryness and fat. Two groups of nontextural mouthfeel attributes were found to be relevant, which were related to perceived temperature and oral irritation. The importance of the attributes for each product category is discussed.
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italianoGli autori malacologici “Bivona, Ant. in Bivona, And., 1838 “ sembrano essere Antonino Bivona e Bernardi (1778-1837) e suo figlio Andrea Bivona. Pertanto, padre e figlio avevano diversi cognomi.Viene fornita un’indagine su tutte... more
italianoGli autori malacologici “Bivona, Ant. in Bivona, And., 1838 “ sembrano essere Antonino Bivona e Bernardi (1778-1837) e suo figlio Andrea Bivona. Pertanto, padre e figlio avevano diversi cognomi.Viene fornita un’indagine su tutte le pubblicazioni malacologiche di questi due autori. Antonino Bivona e Bernardi ha pubblicato tre nuovi generi e 25 nuove specie di molluschi marini. Venne anche riportato cinque volte come autore di nuove specie in un libro di Philippi (1836). Andrea Bivona ha pubblicato due nuovi generi e 28 nuove specie di molluschi marini. Una parte e derivata da un manoscritto di suo padre, una parte e aggiunta da lui stesso. Andrea Bivona ha pubblicato anche 11 nuove specie di molluschi terrestri o d’ acqua dolce.Una notevole e poco chiara abitudine di entrambi gli autori e occasionalmente di mettere specie pubblicate in precedenza da altri autori in sinomia con la loro specie appena descritta quando questa specie e collocata in un genere appena stabilito o tra...
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Straight chain, saturated and unsarurated, aldehydes are important constituents of citrus fruit, dairy, vegetable, meat and other flavours. For instance, alkanals and 2-alkenals (C6 to C14) have been detected and quantified in Bitter... more
Straight chain, saturated and unsarurated, aldehydes are important constituents of citrus fruit, dairy, vegetable, meat and other flavours. For instance, alkanals and 2-alkenals (C6 to C14) have been detected and quantified in Bitter Orange Oil. The organoleptic qualities and threshold values of these compounds are quite different; moreover, the qualities change a lot on dilution. An attempt has been made to correlate the physicochemical parameters with the organoleptic properties of alkanals, alkenals and alkadienals from C6 to C14. The studied physicochemical parameters are molecular weight, vapour pressure, melting point, molecular refraction, partition coefficient and dipole moment: the structural features have also been studied. Organoleptic qualities (of concentrated and diluted stimulants) and threshold values have been investigated. Structure-activity relationships have been found for the flavour components, alkanals. alkenals and alkadienals, with isolated and conjugated do...
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A study was made of the occurrence, identities and sensory properties of volatile nitrogen compounds emitted by flowers and isolated from flower absolutes and essential oils. More than 130 aliphatic- and aromatic-nitrogen compounds,... more
A study was made of the occurrence, identities and sensory properties of volatile nitrogen compounds emitted by flowers and isolated from flower absolutes and essential oils. More than 130 aliphatic- and aromatic-nitrogen compounds, substituted pyridines, quinolines, pyrazines, (iso)oxazoles and thiazoles have been detected in these natural isolates. The sensory properties (i.e., the odor qualities) of various representatives of the nitrogen compounds were studied. Some of the nitrogen compounds contribute significantly to the sensory properties of the naturals
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A selected and trained descriptive sensory panel has assessed samples of crisps and French fries prepared on an industrial scale with either sunflower oil (SO) or high oleic sunflower oil (HOBO). Furthermore, crisps have been fried in... more
A selected and trained descriptive sensory panel has assessed samples of crisps and French fries prepared on an industrial scale with either sunflower oil (SO) or high oleic sunflower oil (HOBO). Furthermore, crisps have been fried in these oils with or without dimethyl polysiloxane (DMPS). Reference samples were prepared using palm olein (PO) or hydrogenated rapeseed/palm oil mixture (RP). Crisps were stored at ambient temperature for six months and French fries at -20°C for 12 months. At regular intervals the samples were assessed. Crisps prepared in SO have a lower sensory quality than those prepared in PO. Frying in HOSO resulted in crips comparable with those fried in PO. The differences found in this study concerning the mouthfeel or texture were thought not to be caused by the application of different oils. The addition of DMPS did not have any positive effect on the storage quality of crisps fried in SO or HOSO. Frying of French fries in HOSO and especially in SO, in compari...
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Abstract A gas chromatograph with flame photometric detection was used to detect at least thirty-seven sulphur compounds in the vapour phase of cigarette smoke. A suggestion as to their possible identity is given for many of them.... more
Abstract A gas chromatograph with flame photometric detection was used to detect at least thirty-seven sulphur compounds in the vapour phase of cigarette smoke. A suggestion as to their possible identity is given for many of them. According to the literature only thirteen sulphur compounds so far have been found in smoke. In a comparative study on three types of cigarettes, prepared from flue cured, air cured and sun cured tobacco, respectively, a great similarity was observed, but there were also some striking differences between air cured tobacco on one hand and flue cured and sun cured tobacco on the other. It is possible that on this basis a method may be developed for the determination of the amount of air cured tobacco in an unknown tobacco blend. Nothing is known about the importance of sulphur compounds with respect to the health of the smoker, though one could speculate on a possible protective effect against alkylating smoke constituents.
Research Interests:
Research Interests:
Research Interests:
... 1980. Gasteropodi dulcicoli e terrestri nell'isola di Dahlak Kebir - testimonianze di una fase umida olocenica nelle isole Dahlak, Mar Rosso. Bollettino... more
... 1980. Gasteropodi dulcicoli e terrestri nell'isola di Dahlak Kebir - testimonianze di una fase umida olocenica nelle isole Dahlak, Mar Rosso. Bollettino Malacologico, 16: 369-390 Beltagi, S. & MS Ghamrawy, 1984. Studies on ...
Theo Ripken and Edi Gittenberger, early days at Leiden University In an interview Theo Ripken has told about his recollections of Edi Gittenberger during their biology study at Leiden, which for both began in 1961. They were than the only... more
Theo Ripken and Edi Gittenberger, early days at Leiden University In an interview Theo Ripken has told about his recollections of Edi Gittenberger during their biology study at Leiden, which for both began in 1961. They were than the only students interested in malacology and a year later were joined by Wim Backhuys. At that time Edi had already published his first malacological paper on fossil marine shells collected at an artificial dune in Breskens, a little town in the far south-western part of the Netherlands. Here, his father - who had moved from Austria in the beginning of the 20 th century - ran a book-shop, making it relatively easy for Edi to purchase malacological literature. Edi and Theo made a number of collecting trips, initially at different locations in Holland and Belgium. In 1964 both visited the Austrian malacologist Walter Klemm (1898-1981) at Bad Ischl. In 1966 Edi, Theo and Wim, after visiting the congress of the German malacological society, made a collecting ...
Relationships between sensory texture attributes and physical properties of mayonnaise and dressings have been explored. The focus of the work was in creaminess and related texture attributes. Samples ranging from 0-70% oil were tested... more
Relationships between sensory texture attributes and physical properties of mayonnaise and dressings have been explored. The focus of the work was in creaminess and related texture attributes. Samples ranging from 0-70% oil were tested sensorially by QDA-panels. Physical caharacterisation of these samples was done using different types of rheological measurements, both at small and large deformation. Data analysis was performed using multivariate statistical techniques (PCA and PLSR). Heterogeneity and creaminess could be predicted succesfully from a set of three rheological variables: flow index n, a fit coefficient from flow curve and one from steady shear measurements.