Anatomie, histologie et affinités de l'appareil séricigène des Hersilia Sav. et Aud. (Araneae: Hersiliidae)

1984 ◽  
Vol 62 (1) ◽  
pp. 97-106 ◽  
Author(s):  
Jacqueline Kovoor
Keyword(s):  
Type A ◽  
The Other ◽  
Secretory Cells ◽  
Evolutionary Stage ◽  
Type B ◽  
Outer Coat ◽  
Silk Glands ◽  
Single Protein

Although hersiliid spiders do not spin any webs, their silk glands, which belong to six types, are large and complex. Two groups of ampullate glands, one opening on the anterior spinnerets and the other on the median spinnerets, secrete two proteins each. About 180 pyriform glands are clearly bipartite. Over 200 type A aciniform glands opening on the median and posterior spinnerets are made up of three categories of secretory cells. Silk from these glands consists of two proteins (core and outer coat) joined together by an intermediary layer of acidic glycoprotein. All the 160 type B aciniform glands opening on the posterior spinnerets secrete a single protein. Fifty tubuliform glands opening on the median and posterior spinnerets produce two proteins, one of which is coloured. As in Urocteinae, long posterior spinnerets and large, numerous aciniform and tubuliform glands are correlated with swathing of prey and egg-cocoon construction. In Lycosidae and Agelenidae, the ampullate glands show the same number and distribution according to the spinnerets. However, anatomical and histochemical features of hersiliid aciniform and ampullate glands are close to those of some Araneoidea. Apart from peculiar characteristics, silk glands of Hersilia might represent an intermediate evolutionary stage towards Araneoidea.

scholarly journals Pyranoanthocyanin Derived Pigments in Wine: Structure and Formation during Winemaking

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Ana Marquez ◽  
María P. Serratosa ◽  
Julieta Merida
Keyword(s):  
Pyruvic Acid ◽  
Formation Process ◽  
Second Generation ◽  
Type A ◽  
Enol Form ◽  
Hydroxycinnamic Acids ◽  
The Other ◽  
Yeast Fermentation ◽  
Type B ◽  
Initial Compound

In recent years many studies have been carried out on new pigments derived from anthocyanins that appear in wine during processing and aging. This paper aims to summarize the latest research on these compounds, focusing on the structure and the formation process. The main pyranoanthocyanins are formed from the reaction between the anthocyanins and some metabolites released during the yeast fermentation: carboxypyranoanthocyanins or type A vitisins, formed upon the reaction between the enol form of the pyruvic acid and the anthocyanins; type B vitisins, formed by the cycloaddition of an acetaldehyde molecule on an anthocyanin; methylpyranoanthocyanins, resulted from the reaction between acetone and anthocyanins; pinotins resulted from the covalent reaction between the hydroxycinnamic acids and anthocyanins; and finally flavanyl-pyranoanthocyanins. On the other hand, the second generation of compounds has also been reviewed, where the initial compound is a pyranoanthocyanin. This family includes oxovitisins, vinylpyranoanthocyanins, pyranoanthocyanins linked through a butadienylidene bridge, and pyranoanthocyanin dimers.

The Brindley's glands of Rhodnius prolixus. II. Development of the glands during the fifth instar

1979 ◽  
Vol 57 (5) ◽  
pp. 1120-1128 ◽  
Author(s):  
B. F. Millen ◽  
F. M. Barrett ◽  
J. Lai-Fook
Keyword(s):  
Type A ◽  
Rhodnius Prolixus ◽  
Glandular Epithelium ◽  
Secretory Cells ◽  
Type B ◽  
Duct Cells ◽  
Secretory Apparatus

The histology of the developing Brindley's gland of adult Rhodnius is described. The presumptive epithelium from which the gland will develop is distinguishable on the 4th day after feeding the fifth instar by its intense stainability. The epithelium thickens and lengthens through rapid mitosis resulting in a hollow, thick-walled sac with a short duct. The duct cells become distinguishable first, then glandular epithelium and the saccules and eventually the secretory apparatus of the secretory cells. Mitosis continues, at a decreasing rate, until the 20th day after feeding, somewhat later than it would occur in the surrounding integument. Just prior to ecdysis the type A glandular units are indistinguishable from those of the adult; however, the type B units appear somewhat less completely developed.

Evidence for a dual control, by neurosecretion, of hormone synthesis and hormone release in the pituitary of the dogfish scylliorhinus stellaris

1965 ◽  
Vol 249 (760) ◽  
pp. 435-455 ◽  
Keyword(s):  
Direct Contact ◽  
Type A ◽  
Secretory Cells ◽  
Dual Control ◽  
Hormone Release ◽  
Type B ◽  
Intimate Contact ◽  
Hormone Synthesis ◽  
Elasmobranch Fish ◽  
Peripheral Cells

The intrinsic secretory cells of the neuro-intermediate lobes of the pituitary of the elasmobranch fish Scylliorhinus stellaris belong to two main categories (1) central cells which do not demonstrate any marked polarity of their cytoplasmic organelles and show no clear indications of being under neurosecretory control, and (2) peripheral cells which are polarized along an axis from a synthetic pole to a storage and release pole. Neurosecretory fibres make intimate contact with the two poles of these peripheral cells. The neurosecretory fibres may be classed as type A or type B by the size and appearance of the elementary neurosecretory vesicles they contain. These two fibres innervate the synthetic and release poles of the intrinsic cells respectively by direct contact of their terminals to form secretomotor junctions. It seems likely that there is a dual control of synthesis and release of a melanophore-dispersing hormone (MSH). The possibility that type A fibres inhibit synthesis by a peptide substance with oxytocic action, and that MSH release is controlled by amine production by type B fibres is discussed.

scholarly journals Crossings and Nestings in Set Partitions of Classical Types

10.37236/392 ◽  
2010 ◽  
Vol 17 (1) ◽  
Author(s):  
Martin Rubey ◽  
Christian Stump
Keyword(s):  
Type A ◽  
The Other ◽  
Type B ◽  
Set Partition ◽  
Set Partitions ◽  
Type D ◽  
Other Hand ◽  
The One

In this article, we investigate bijections on various classes of set partitions of classical types that preserve openers and closers. On the one hand we present bijections for types $B$ and $C$ that interchange crossings and nestings, which generalize a construction by Kasraoui and Zeng for type $A$. On the other hand we generalize a bijection to type $B$ and $C$ that interchanges the cardinality of a maximal crossing with the cardinality of a maximal nesting, as given by Chen, Deng, Du, Stanley and Yan for type $A$. For type $D$, we were only able to construct a bijection between non-crossing and non-nesting set partitions. For all classical types we show that the set of openers and the set of closers determine a non-crossing or non-nesting set partition essentially uniquely.

A Hypothesis on the Origin of Old Chinese Pharyngealization (上古漢語咽化聲母來源的一個假設)

2016 ◽  
Vol 9 (2) ◽  
pp. 179-189
Author(s):  
Laurent Sagart (沙加爾) ◽  
William H. Baxter (白一平)
Keyword(s):  
Type A ◽  
Statistical Correlation ◽  
The Other ◽  
Type B ◽  
Old Chinese ◽  
Short Vowels ◽  
Surface Constraint ◽  
Glottal Stop ◽  
The One

It is proposed that oc pharyngealized onset consonants—that is, ‘type-A’ onset consonants—arose out of Proto-Sino-Tibetan plain consonants followed by geminate vowels separated by a pharyngeal fricative. When the first copy of the geminate vowel fell, the initial consonants formed clusters with the pharyngeal fricative, evolving into the oc pharyngealized consonants we reconstruct. In the Kuki-Chin branch of Tibeto-Burman, the pharyngeal fricative fell, and long vowels resulted. This proposal supposes a statistical correlation between Kuki-Chin long vowels and oc type-A words on the one hand, and between Kuki-Chin short vowels and oc type-B words on the other, as originally proposed by S. Starostin. A significant statistic bearing on forty-three probable Chinese-Kuki-Chin cognates supports this correlation. Thus reconstructed, a precursor language of Proto-Sino-Tibetan was aligned with Proto-Austronesian and Proto-Austroasiatic in exhibiting a surface constraint against monomoraic free words: by that constraint, the vowel of an underlying monosyllable was realized as a geminate with an intervening parasitic consonant such as a glottal stop or a pharyngeal fricative, while the vowels of a disyllable remained nongeminate. After reduction of disyllables to monosyllables, this process resulted in a pharyngealized vs. nonpharyngealized consonant distinction in oc. 論文提出對上古漢語咽化聲母（即“A類聲母”）來源的一個假設，認為咽化聲母來源於原始漢藏語的無標記輔音，並且此無標記輔音後跟隨著由咽部擦音[ʕ]分割的雙胞元音（geminate vowels）。在雙胞元音的前半部分脫落後，輔音聲母跟咽部擦音形成了複輔音。新形成的複輔音最終演變為上古漢語的咽化聲母。而在藏緬語庫基-欽（Kuki-Chin）語支中，則是咽化擦音脫落，使雙胞元音變為長元音。本文解釋了漢語與庫基-欽語中一個統計學的顯著相關性：一方面，庫基-欽語含長元音的詞與上古漢語含A類聲母的詞呈顯著相關；另一方面，庫基-欽語含短元音的詞與上古漢語含B類聲母的詞呈顯著相關，正如斯塔羅金（S. Starostin）所說。據此構擬，我們提出原始漢藏語、原始南島語與原始南亞語中的一個共同限制（constraint）：禁止在語流中出現單音拍（monomoraic）詞。在這一限制的作用下，單音節詞的單元音發生了雙胞化（germination），雙胞元音中間插入了喉塞音或咽部擦音之類的次聲輔音。而同時，雙音節詞的元音無變化。漢語經過雙音節詞的單音節化，就形成了無標記輔音與咽化輔音的音位對立。(This article is in English.)

scholarly journals Two Classes of Entropy Measures for Complex Fuzzy Sets

Mathematics ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 96 ◽  
Author(s):  
Lvqing Bi ◽  
Zhiqiang Zeng ◽  
Bo Hu ◽  
Songsong Dai
Keyword(s):  
Fuzzy Sets ◽  
Unit Circle ◽  
Type A ◽  
Rotational Invariance ◽  
The Other ◽  
Membership Functions ◽  
Type B ◽  
Invariance Properties ◽  
Entropy Measures ◽  
Complex Valued

Complex fuzzy sets are characterized by complex-valued membership functions, whose range is extended from the traditional fuzzy range of [0,1] to the unit circle in the complex plane. In this paper, we define two kinds of entropy measures for complex fuzzy sets, called type-A and type-B entropy measures, and analyze their rotational invariance properties. Among them, two formulas of type-A entropy measures possess the attribute of rotational invariance, whereas the other two formulas of type-B entropy measures lack this characteristic.

scholarly journals The projected directive construction and object case marking in Finnish

2017 ◽  
Vol 8 (2) ◽  
pp. 155-190
Author(s):  
Yrjö Lauranto
Keyword(s):  
Type A ◽  
The Other ◽  
Type B ◽  
Case Marking ◽  
Action Type ◽  
Type C ◽  
The One ◽  
Causative Construction ◽  
Action Verbs

This article examines object case marking in a Finnish verb structure called the Projected Directive Construction, e.g. Liisa pyysi Matti-a lähte-mä-än ‘Liisa asked Matti to leave’ (Liisa.NOMINATIVE asked Matti-PARTITIVE leave-INF-ILLATIVE). The PDC is divided into three subtypes. Type A includes verbs such as pyytää ‘to request’, which take a partitive object regardless of the outcome of the action. Verbs used in type B, such as määrätä ‘to order’, take an accusative object despite the result of the action. Type C comprises verbs such as suostutella ‘to persuade’ taking either a partitive or an accusative object, depending on the outcome of the semiotic causation expressed in the clause. The object case marking in the three subtypes reflects the two-faceted nature of the construction: on the one hand, it is a construction used for reporting of speech, on the other, it is a causative construction. It seems that boundedness – as it has traditionally been defined – does not suffice to describe the alternation of the object case in the PDC.Kokkuvõte. Yrjö Lauranto: Projitseeritud direktiivsed konstruktsioonid ja objekti käände markeerimine soome keeles. Artiklis käsitletakse objekti käänet soome keele projitseeritud direktiivses konstruktsioonis (PDK), nt Liisa pyysi Matti-a lähte-mä-än ‘Liisa palus Matit ära minna’. PDK võib jagada kolme alltüüpi. Tüüp A sisaldab verbe nagu pyytää ‘paluda’, mis nõuavad partitiivobjekti, sõltumata tegevuse tulemusest. Tüüp B verbid nagu määrätä ‘käskida’ nõuavad akusatiivobjekti, sõltumata tegevuse tulemuslikkusest. Tüüpi C kuuluvad verbid nagu suostutella ‘veenda’, mis võivad võtta nii partitiivse kui akusatiivse objekti, sõltuvalt lausega väljendatud semiootilise põhjustatuse tulemusest. Kolme alltüübi käändemarkeering peegeldab konstruktsiooni kahetist olemust: ühelt poolt kasutatakse konstruktsiooni kõne vahendamiseks, teiselt poolt on tegemist kausatiivse konstruktsiooniga. Seega ei piisa PDK objekti käändevahelduse selgitamiseks vaid piiritletuse mõistest.Võtmesõnad: objekti käände markeerimine; piiritletus; akusatiiv; partitiiv; kõne ja mõtete vahendamine; projitseerimine; kausatiivne konstruktsioon; soome keel

TWO TYPES OF SERTOLI CELLS IN MAN

1969 ◽  
Vol 61 (1) ◽  
pp. 111-116 ◽  
Author(s):  
Svend G. Johnsen
Keyword(s):  
Nucleic Acids ◽  
Sertoli Cell ◽  
Sertoli Cells ◽  
Picric Acid ◽  
Type A ◽  
The Other ◽  
Type B ◽  
Iron Alum ◽  
Haematoxylin Staining

ABSTRACT By means of iron haematoxylin staining carefully differentiated by either picric acid or iron alum, Sertoli cells may be differentiated into two types, one (type A) containing unstained nuclei and the other (type B) intensely stained nuclei. No intermediate forms appear to be present. The two types are most easily found in the Sertoli-cell-only syndrome but they are present in the testes with spermatogenesis although type B is rare. The immature (pro-) Sertoli cells in infantile testes also display the two types. The two types of Sertoli cells differ in their degree of binding between nucleic acids and nucleic protein. The significance of the existence of these two types is discussed.

scholarly journals Two types of fatty acid-binding protein in human kidney. Isolation, characterization and localization

1991 ◽  
Vol 273 (3) ◽  
pp. 759-766 ◽  
Author(s):  
R G H J Maatman ◽  
T H M S M Van Kuppevelt ◽  
J H Veerkamp
Keyword(s):  
Fatty Acid ◽  
Human Liver ◽  
Fatty Acid Binding Protein ◽  
Binding Protein ◽  
Human Kidney ◽  
Type A ◽  
The Other ◽  
Type B ◽  
Fatty Acid Binding ◽  
Acid Binding Protein

Two types of fatty acid-binding protein (FABP) were isolated from human kidney by gel filtration and ion-exchange chromatography. Northern-blot analysis showed the presence of two FABP transcripts in total kidney RNA, hybridizing with cDNA of human liver and muscle FABP respectively. Characterisation based on molecular mass, isoelectric point, fluorescence with dansylaminoundecanoic acid and immunological cross-reactivity showed that one, type B, was fairly similar to human heart FABP. The other, type A, showed, like human liver FABP, a high fluorescence enhancement and a wavelength shift with dansylaminoundecanoic acid as well as the binding of a variety of ligands. Antibodies raised against FABP type A and against liver FABP markedly cross-reacted in e.l.i.s.a., in Western blotting and in indirect immunoperoxidase staining on kidney and liver sections. Differences in amino acid composition and isoelectric points, however, indicate that type A is a new kidney-specific FABP type. The FABP type A is more abundant in kidney than the B type and is predominantly localized in the cortex, especially in the cells of the proximal tubules. The FABP type B is mainly present in the cells of the distal tubules. In conclusion, this study shows the presence of two types of FABP in the kidney. One type seems to be related to heart FABP, while the other type resembles, but is not identical with, liver FABP. Both types have a characteristic cellular distribution along the nephron.

scholarly journals Kaolin clotting time and dilute Russell's viper venom time distinguish between prothrombin-dependent and beta 2-glycoprotein I-dependent antiphospholipid antibodies

Blood ◽  
1995 ◽  
Vol 86 (2) ◽  
pp. 617-623 ◽  
Author(s):  
M Galli ◽  
G Finazzi ◽  
EM Bevers ◽  
T Barbui
Keyword(s):  
Factor Xa ◽  
Type A ◽  
The Other ◽  
Type B ◽  
Clotting Time ◽  
Positive Group ◽  
Glycoprotein I ◽  
Factor Ixa ◽  
Beta 2 ◽  
Kaolin Clotting Time

Antiphospholipid (aPL) antibodies include anticardiolipin (aCL) and lupus anticoagulant (LA) antibodies. LA antibodies recognize the complex of lipid-bound (human) prothrombin, in this way inhibiting the phospholipid-dependent coagulation reactions, whereas aCL antibodies are directed towards beta 2-glycoprotein I (beta 2-GPI) bound to an anionic lipid surface. According to their behavior in coagulation reactions, we have divided aCL antibodies into two groups: aCL-type A, which inhibit the phospholipid-dependent coagulation reactions because they enhance the binding of beta 2-GPI to the procoagulant phospholipid surface; and aCL-type B antibodies, which are devoid of anticoagulant properties. We report the distinctive laboratory and clinical profiles of 25 patients with well-characterized, phospholipid-dependent inhibitor of coagulation. Fourteen patients had LA antibodies (aCL-type B were concomitantly present in 10 cases, while in the other four, aCL titer was normal), and the other 11 had aCL-type A antibodies. The laboratory evaluation of the two groups showed the dilute Russell viper venom time (dRVVT) to be the most abnormal coagulation test in the aCL- type A-positive group, whereas the kaolin clotting time (KCT) was the most abnormal assay in the LA-positive group. In fact, the ratios of the coagulation times of patient plasma over normal pooled plasma (mean +/- standard deviation) for LA versus aCL-type A antibodies were 1.48 +/- 0.27 versus 2.20 +/- 0.42, P = .0001, and 2.22 +/- 0.42 versus 1.50 +/- 0.42, P = .0003, for the dRVVT and KCT, respectively. No differences were observed either in the ratios of the activated partial thromboplastin times and the prothrombin times or the plasma levels of beta 2-GPI and prothrombin. Conversely, aCL titers were significantly higher in aCL-type A-positive patients (147 +/- 44 U) than in the LA- positive group (61 +/- 55 U; P = .0003). We ruled out the possibility that platelet contamination of plasma could account for the observed coagulation profiles, as the two patterns were reproduced in platelet- free plasma. In addition, we performed clotting tests in plasma in the presence of phospholipids and calcium after addition of factor IXa or factor Xa. The assay performed with factor Xa was more sensitive to the presence of aCL-type A antibodies, while the assay performed with factor IXa was preferentially sensitive to LA-containing plasmas, supporting the earlier findings with the dRVVT and KCT assays.(ABSTRACT TRUNCATED AT 400 WORDS)

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