Feeding behaviour and bioerosion: the ecological role of the rock-boring urchin, Echinometra mathaei (de Blainville, 1825), in Okinawa reef flat

2013 ◽  
Vol 1 (1) ◽  
pp. 10
Author(s):  
Noar Muda Satyawan ◽  
Shelly Tutupoho ◽  
Yusli Wardiatno ◽  
Makoto Tsuchiya
Keyword(s):  
Feeding Behaviour ◽  
Reef Flat ◽  
Type A ◽  
Gut Contents ◽  
Biological Processes ◽  
Type B ◽  
Night Time ◽  
Echinometra Mathaei ◽  
Benthic Ecosystems

Erosion rate on corals due to activities of other biota is called bioerosion. The rock-boring urchin, Echinometra mathaei, when it is abundant, plays a significant role in benthic ecosystems, including biological processes like coral erosion. During feeding, E. mathaei erodes calcium carbonate besides grazing on algae living on coral, so it plays an important role in both organic and inorganic carbons in coral reefs. The urchin E. mathaei actively feeds during the night time (nocturnal grazer). Although in Okinawa four types (A-D) of the urchin exist, the research only focused on the types A and B. Type A of E. mathaei produced 0.44951 g feces per day on average while type B produced 0.38030 g feces per day. CaCO3 analysis in feces and gut contents showed bioerosion rate of E. mathaei type A was 0.64492 g/individu/day, and 0.54436 g/individu/day in type B. There were no significant differences in bioerosion impact of E. mathaei type A and B© Laju erosi pada karang yang disebabkan oleh biota, dikenal dengan bioerosi. Bulu babi jenis Echinometra mathaei, ketika melimpah, menjadi sangat berpengaruh terhadap ekosistem bentik termasuk proses biologi seperti erosi karang. Selama aktivitas makan, E. mathaei menggerus kalsium karbonat dalam proporsi yang besar di samping alga yang tumbuh menempel pada karang sehingga memiliki peran penting dalam siklus karbon organik dan anorganik di ekosistem terumbu karang. Bulu babi E. mathaei aktif mencari makan pada malam hari (nocturnal grazer). Meskipun di Okinanawa ada 4 tipe (A-D), pada eksperimen kali ini memfokuskan pada tipe A dan B saja. Tipe A E. mathaei rata-rata memproduksi 0,44951 g feses/hari dan tipe B memproduksi 0,38030 g feses/hari. Berdasarkan analisis CaCO3 yang dilakukan pada feses dan isi lambung, laju bioerosi yang disebabkan oleh E. mathaei tipe A sebesar 0,64492 g/individu/hari sedangkan tipe B sebesar 0,54436 g/individu/hari. Tidak terdapat perbedaan dampak bioerosi yang signifikan antara E. mathaei tipe A dan B©

scholarly journals Impact Test Size and Type of Echinometra mathaei as Agent of Bioerosion on Reef Flat (Pengaruh Ukuran dan Tipe Echinometra mathaei pada Bioerosi Karang)

2014 ◽  
Vol 19 (2) ◽  
pp. 75 ◽  
Author(s):  
Cristiana Manullang ◽  
Makoto Tsuchiya ◽  
Ambariyanto Ambariyanto ◽  
Diah Permata
Keyword(s):  
Sea Urchin ◽  
Type Species ◽  
Reef Flat ◽  
Impact Test ◽  
Type A ◽  
Inorganic Materials ◽  
Type B ◽  
Gut Content ◽  
Test Size ◽  
Echinometra Mathaei

Bioerosi adalah aktivitas berbagai organisme yang menyebabkan terjadinya erosi dan kerusakan misalnya pada kalsium karbonat karang. Aktivitas ini merupakan faktor utama yang mempengaruhi morfologi terumbu karang. Bioerosi dipengaruhi oleh tiga variabel yakni jenis spesies, ukuran dan kelimpahan spesies tersebut. Tujuh puluh lima persen dari bioerosi disebabkan oleh landak laut. Perbedaan pada ukuran dan jenis landak laut memberikan dampak signifikan terhadap daerah yang terjadi bioerosi. Penelitian ini bertujuan untuk menguji pengaruh ukuran dan jenis landak laut E. mathaei (tipe A dan B) pada komposisi CaCO3 dalam isi usus dan tinja organisme tersebut sebagai agen bioersi. Landak laut yang digunakan diperoleh dari ekosistem karang di pantai Minatogawa, Okinawa-Jepang. Masing-masing tipe landak laut dibedakan berdasarkan ukuran ≥30 mm dan <30mm. Penelitian dilakukan dengan tiga ulangan. Pemeliharaan ini dilakukan di laboratorium dengan analisis komposisi CaCO3 pada tinja dan konten usus. Hasil penelitian membuktikan bahwa komposisi CaCO3 disebabkan karena aktivitas bioerosi harian dari E. mathaei. Landak laut dengan ukuran diameter ≥30 mm terbukti lebih aktif dibandingkan dengan diameter <30mm. Disamping itu landak laut tipe B lebih aktif dibandingkan tipe A dengan ukuran yang sama. Persentase CaCO3 dalam usus selama pemeliharaan di laboratorium adalah 73% dan sisa 27% berupa bahan organik dan anorganik. Bierosion harian E. mathaei tipe A ≥ 30 mm 166,70 mg.hari-1, tipe A <30 mm 77.78 mg.hari-1, tipe B ≥ 30 mm 126,30 mg.hari-1, tipe B <30 mm 116,17 mg.hari-1. Tingkat bioerosion harian E. mathaei dipengaruhi oleh jenis, spesies, kecepatan menggiling, dan ukuran landak laut. Kata kunci: ukuran; Echinometra mathaei; bioerosi; karang Bioerosion is an activity of various organisms such as erosion and destruction of coral calcium carbonate and become a major factor influencing coral reefs morphology. Bioerosion is influenced by three variables: type of species, size of species and abundance. Seventyfive percent of bioerosion caused by sea urchin. Differences on size and type of sea urchin gave a significant impact to the bioerosion area. This study aimed to examine the influence of the size and the type of sea urchin E. mathaei (type A and type B) on the composition of CaCO3 in the gut content and feces as bioersion agent on the reef flat in Minatogawa Coast, Okinawa-Japan. The organisms used were E. mathaei type A and type B with each type distinguished by size ≥ 30 mm and < 30 mm with three replications. The maintenance was carried out at laboratory for 3 days by observing analysis of the composition of CaCO3 on feces and gut content. It indicates that the composition of CaCO3 as daily bioerosion was caused by E. mathaei. The results showed E. mathaei with diameter ≥ 30 mm was more active than those with diameter of < 30mm and type B was more active than type A in each of the same size. Percentage of CaCO3 in the gut during maintenance in the laboratory was 73% and the other 27% consist of organic and inorganic materials. Daily bierosion E. mathaei type A ≥ 30 mm 166.70 mg.day-1 , type A < 30 mm 77.78 mg.day-1 , type B ≥ 30 mm 126.30 mg.day-1 , type B < 30 mm 116.17 mg.day-1. Daily bioerosion rate E. mathaei was influenced by the type, species, speed of grind, and the size of the sea urchin. Keywords: size; Echinometra mathaei; bioerosion; reef flat

scholarly journals SAT-006 A New Concept for the Endocrinology of Pre-Eclampsia: The Role of Spiral Steroids

2020 ◽  
Vol 4 (Supplement_1) ◽  
Author(s):  
Fred I Chasalow ◽  
Ron Bochner
Keyword(s):  
Type A ◽  
Structural Features ◽  
Type B ◽  
Salt Diet ◽  
Breast Cyst ◽  
High K ◽  
Epithelial Na Channels ◽  
Low Salt

Abstract Background: In 1987, Graves observed that during the 3rd trimester, some patients with pre-eclampsia had high levels of unknown materials that could be detected with assays for digoxin (DLM). In 2018, we characterized a new candidate for the DLM, Ionotropin. It is a phosphocholine (PC) ester of a novel steroid with 23 carbon atoms. As Ionotropin shares structural features (a) with spironolactone (both have spiral lactones in the E-ring) and (b) with digoxin (E-ring lactone and 3α-5β configuration), we have proposed that Ionotropin may function as a potassium (K+) sparing diuretic. This suggestion is supported by the observations that [1] patients who cannot make Ionotropin (7-dehydrosterol reductase deficiency) are K+ wasting and [2] breast cyst fluids with high K+ levels also have high Ionotropin levels. Hypothesis: During the 3rd trimester, fetal requirements for K+ reach a maximum, fetal blood pressure increases and aldosterone signaling is blocked. This blockage leads to fetal sodium (Na+) wasting and is essential for formation of amniotic fluid. These events are consistent with a normal role for an unknown endogenous K+ sparing hormone and would be the basis for a modest elevation of maternal DLM during the 3rd trimester. Our hypothesis is that if any of the functions were inadequate, then the fetal-placental unit would synthesize excess PC-spiral steroids; the woman would exhibit symptoms of K+ sparing hormone excess (hypertension and proteinuria) and would be diagnosed with pre-eclampsia. Experimental Results: We have just reported a pilot study associating elevated PC esters of spiral steroids in women with pre-eclampsia. In brief, 12 of 19 women had elevated levels of at least one of the PC steroids (Z-score &gt; 2) when compared to the levels in 20 pregnant women matched for gestational age and fetal sex. There are two basic mechanisms for this dichotomy: (a) there may be episodic secretion with of a DLM with a short half-life or (b) there may be two different underlying biochemical causes. In prior studies, there has been no indication of episodic secretion of DLM similar to that observed with glucocorticoids, Ionotropin or other PC spiral steroids. Discussion: There are two basic types of K+ sparing diuretics. Type A: Spironolactone functions by regulating the NaK-ATPase. Type B: Triamterene functions by blocking synthesis of epithelial Na+ channels. Thus, Type A would have high levels of spiral steroids and Type B would have low levels of spiral steroids. Type A patients would be expected to have higher risk of long-term consequences when compared to the Type B patients. Conclusion: The recognition of the division of pre-eclampsia into two separate diseases might be the key observation for developing Type-specific diagnosis and therapy. For example, a Type A patient might benefit from a low salt diet but that diet would not be expected to benefit a patient with Type B disease.

The Role of Type A Behaviour Pattern in Chronic Headache

1988 ◽  
Vol 5 (1) ◽  
pp. 3-8 ◽  
Author(s):  
Joel J. Hillhouse ◽  
Edward B. Blanchard ◽  
Kenneth A. Appelbaum ◽  
Cynthia Kirsch
Keyword(s):  
Chronic Headache ◽  
Type A ◽  
Behaviour Pattern ◽  
Type B ◽  
Daily Diaries ◽  
Dependent Variables ◽  
Headache Type ◽  
Activity Survey

Chronic headache sufferers (N = 133) were assessed for Type A behaviour pattern using the Jenkins Activity Survey (JAS). The Type A score frequency distribution for all headache subjects combined, and each headache type separately were examined. Median scores of the all subjects combined group fell into the indeterminate range of Type A scores, that is, neither Type A or Type B. This was also the case for migraine and tension sufferers. Mixed subject's scores fell into the range of scores usually classified as Type A. Forty-five percent of the mixed subjects fit the criteria for Type A behaviour pattern. Follow-up bivariate and multivariate analysis using J AS subscale scores as independent predictors and headache activity scores, from daily diaries, as dependent variables revealed only three correlations which approached significance. These results argue against a clear linear relationship between chronic headache and Type A behaviour pattern. There may be some utility in this construct when differentiated by headache type.

scholarly journals Desmoglein 2 regulates cardiogenesis by restricting hematopoiesis in the developing murine heart

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hoda Moazzen ◽  
Kateryna Venger ◽  
Sebastian Kant ◽  
Rudolf E. Leube ◽  
Claudia A. Krusche
Keyword(s):  
Heart Development ◽  
Type A ◽  
Regulatory Role ◽  
Structural Defects ◽  
Intercellular Signaling ◽  
Type B ◽  
Cell Clusters ◽  
Cardiac Wall ◽  
Myocardial Wall

AbstractCardiac morphogenesis relies on intricate intercellular signaling. Altered signaling impacts cardiac function and is detrimental to embryonic survival. Here we report an unexpected regulatory role of the desmosomal cell adhesion molecule desmoglein 2 (Dsg2) on murine heart development. A large percentage of Dsg2-mutant embryos develop pericardial hemorrhage. Lethal myocardial rupture is occasionally observed, which is not associated with loss of cardiomyocyte contact but with expansion of abnormal, non-myocyte cell clusters within the myocardial wall. Two types of abnormal cell clusters can be distinguished: Type A clusters involve endocard-associated, round-shaped CD31+ cells, which proliferate and invade the myocardium. They acquire Runx1- and CD44-positivity indicating a shift towards a hematopoietic phenotype. Type B clusters expand subepicardially and next to type A clusters. They consist primarily of Ter119+ erythroid cells with interspersed Runx1+/CD44+ cells suggesting that they originate from type A cell clusters. The observed pericardial hemorrhage is caused by migration of erythrocytes from type B clusters through the epicardium and rupture of the altered cardiac wall. Finally, evidence is presented that structural defects of Dsg2-depleted cardiomyocytes are primary to the observed pathogenesis. We propose that cardiomyocyte-driven paracrine signaling, which likely involves Notch1, directs subsequent trans-differentiation of endo- and epicardial cells. Together, our observations uncover a hitherto unknown regulatory role of Dsg2 in cardiogenesis.

scholarly journals Cholecystokinin Type A and Type B Receptors and Their Modulation of Opioid Analgesia

Physiology ◽  
1997 ◽  
Vol 12 (6) ◽  
pp. 263-268 ◽  
Author(s):  
F Benedetti
Keyword(s):  
Species Differences ◽  
Type A ◽  
Type B ◽  
Receptor Specificity ◽  
Endogenous Opioid ◽  
Endogenous Opioid Systems ◽  
Cck Antagonists ◽  
Opioid Systems ◽  
Lines Of Evidence

Several lines of evidence indicate that cholecystokinin (CCK) antagonists potentiate analgesia induced by exogenous opioids. Similarly, CCK antagonists enhance analgesia induced by procedures that activate endogenous opioid systems. However, because there are substantial species differences in receptor specificity and distribution, the role of CCK type A and type B receptors has yet to be clearly established.

Tone Language Type Change in Africa and Asia

Diachronica ◽  
1992 ◽  
Vol 9 (2) ◽  
pp. 239-257
Author(s):  
Martha Ratliff
Keyword(s):  
Type A ◽  
Type B ◽  
Function Type ◽  
Tone Language ◽  
Tone Languages ◽  
Type Change ◽  
Tone Function ◽  
Morphological Patterns ◽  
Language Type

SUMMARY Tone languages can be characterized by the degree to which they realize one of two tone language prototypes defined in terms of tone function. Type A tone languages (usually Asian) employ tone lexically and in minor morphological patterns. Type B tone languages (usually African and Mesoamerican) employ tone to make major morphological distinctions in addition to performing type A functions. For communicative reasons, these functions are necessarily linked to other structural properties of the languages of each type. This paper discusses three tone languages which have undergone different degrees of tone language type change and, as a result, are genetically or areally atypical: !Xũ (Khoisan), Gokana (Niger-Congo), and Mpi (Tibeto-Burman). It is the claim of the author that the driving force behind tone language type change, as exemplified by these three languages, is a change in the role of segmental morphology. RÉSUMÉ On peut caractériser les langues tonales par le degré par lequel elles réalisent un des deux prototypes de langues tonales définis en terme de fonction tonale. Les langues tonales de type A (généralement asiatiques) emploient le ton pour des fonctions lexicales et des fonctions morphologiques mineures. Outre les fonctions de type A, les langues tonales de type B (généralement africaines et mésoaméricaines) emploient le ton pour des fonctions morphologiques majeures. La communication ayant ses exigences, ces fonctions sont inévitablement liées aux autres propriétés structurales de chaque type. Dans cette étude il s'agit de trois langues tonales qui ont subi différents degrés de changement de type tonal et qui sont, par conséquent, atypiques du point de vue génétique et régional: !Xũ (Khoisan), Gokana (Niger-Congo), et Mpi (Tibeto-Birman). Se fondant sur ces trois langues, l'auteur émet l'hypothèse que la causalité de l'évolution du ton se trouve dans un changement du rôle de la morphologie segmentate. ZUSAMMENFASSUNG Tonsprachen kônnen nach dem Grade, nach dem sie einem der beiden Pro-totypen folgen, charakterisiert werden, und zwar im Sinne ihrer Funktion: Typ A Tonsprachen (meistens asiatische) verwenden Ton lexikalisch und in we-niger wichtigen morphologischen Strukturen; Typ B Tonsprachen (zumeist afrikanische und mittelamerikanische) hingegen verwenden Ton, um wichtige morphologische Unterscheidungen zu treffen, wâhrend sie gleichzeitig auch Funktionen des Typ A wahrnehmen. Aus kommunikativen Griinden sind die Funktionen notwendigerweise mit anderen Struktureigenschaften der Sprachen des jeweiligen Typs verbunden. Der Aufsatz analysiert drei Tonsprachen, die zu verschiedenen Graden Ànderungen in ihrem Tonsystemtyp erfahren haben und daher als entweder genetisch oder areal gesehen atypisch sind: !Xu (Khoi-san), Gokana (Niger-Kongo) und Mpi (Tibeto-Burmesisch). Die Autorin ist der Auffassung, daB die treibende Kraft hinter diesem Tonsprachentypwandel, wie er in diesen drei Sprachen aufgezeigt wird, in der Verânderung in der Rolle der segmentalen Morphologie in diesen Sprachen zu suchen sei.

scholarly journals Further studies on the role of phospholipids in determining the characteristics of mitochondrial binding sites for type I hexokinase.

2000 ◽  
Vol 47 (4) ◽  
pp. 1045-1060 ◽  
Author(s):  
J Hutny ◽  
J E Wilson
Keyword(s):  
Binding Sites ◽  
Type A ◽  
Brain Mitochondria ◽  
Bovine Brain ◽  
Type I ◽  
Type B ◽  
Acidic Phospholipids ◽  
P Type ◽  
Triton X

Previous work has indicated that two types (A and B) of binding sites for hexokinase exist, but in different proportions, on brain mitochondria from various species. Hexokinase is readily solubilized from Type A sites by glucose 6-phosphate (Glc-6-P), while hexokinase bound to Type B sites remains bound even in the presence of Glc-6-P. Type A:Type B ratios are approximately 90:10, 60:40, 40:60, and 20:80 for brain mitochondria from rat, rabbit, bovine and human brain, respectively. The present study has indicated that MgCl2-dependent partitioning of mitochondrially bound hexokinase into a hydrophobic (Triton X-114) phase is generally correlated with the proportion of Type B sites. This partitioning behavior is sensitive to phospholipase C, implying that the factor(s) responsible for conferring hydrophobic character is(are) phospholipid(s). Substantial differences were also seen in the resistance of hexokinase, bound to brain mitochondria from various species, to solubilization by Triton X-100, Triton X-114, or digitonin. This resistance increased with proportion of Type B sites. Enrichment of bovine brain mitochondria in acidic phospholipids (phosphatidylserine or phosphatidylinositol), but not phosphatidylcholine or phosphatidylethanolamine, substantially increased solubilization of the enzyme after incubation at 37 degrees C. Collectively, the results imply that the Type A and Type B sites are located in membrane domains of different lipid composition, the Type A sites being in domains enriched in acidic phospholipids which lead to greater susceptibility to solubilisation by Glc-6-P.

scholarly journals Epistemic transfer between linguistics and neuroscience: Problems and prospects

2020 ◽  
Author(s):  
Giosuè Baggio
Keyword(s):  
Computational Linguistics ◽  
Type A ◽  
Neural Correlates ◽  
Linguistic Knowledge ◽  
Type B ◽  
Neural Data ◽  
Type C ◽  
Linguistic Functions ◽  
Language Type

This chapter analyzes instances of successful, partial, and failed unidirectional epistemic transfer between theoretical linguistics and neuroscience. I distinguish three types of transfer, depending on the nature of the linguistic knowledge involved: type-A knowledge, about language as such, essentially invariant across theories or formalisms; type-B knowledge, about alternative formal analyses of basic structures and operations in language; type-C knowledge, about the application of various computational methods to analyzing or modeling behavioral or neural data. I conclude that successful epistemic transfer may be achieved, under certain conditions, with type-A and type-C knowledge, and I present some examples of the strengths and limitations of each approach. Type-B transfer, however, in particular from theories of syntactic and semantic composition, so far has not led to new knowledge of the neural correlates and mechanisms of linguistic computation. I suggest that greater theoretical emphasis on algorithmic-level analyses, via a revised notion of linguistic competence and a new model of epistemic transfer, can bring formal linguistics and neuroscience closer together. Finally, I discuss the possible role of a computationalist psycholinguistics as a semi-autonomous ‘bridge science’, that could serve the aim of linking linguistics and neuroscience through algorithmic models of linguistic functions, aided by emerging methods and results in areas of computational linguistics, computer science, and AI.

Type a Behavior and Situation-Specific Perceptions of Control

1987 ◽  
Vol 60 (3) ◽  
pp. 991-999 ◽  
Author(s):  
Dennis G. Dyck ◽  
Cathy G. Moser ◽  
Michel Pierre Janisse
Keyword(s):  
Perceived Control ◽  
Time Pressure ◽  
Social Comparisons ◽  
Type A ◽  
Type A Behavior ◽  
The Other ◽  
Type B ◽  
Jenkins Activity Survey ◽  
Activity Survey

Two experiments were conducted to study perceptions of control for recalled situations among Jenkins Activity Survey-defined Type A and Type B college students. The subjects recalled past situations of competition and time pressure and then provided ratings of vividness and perceived control for self and others. The results indicated that Type A subjects had more vivid recollections of both competition and time pressure situations than did Type B persons. On the other hand, Type A scorers made higher ratings of perceived control-for-self than Type B scorers for recalled competitive but not for time pressure situations. Other results indicated that the speed and impatience scores on Jenkins' scale were negatively correlated to perceptions of control in the recalled time pressure situations. These results, together with recent findings which show that Type A persons perceive less control in recalled angry situations indicate that A/B differences in perceived control are situationally specific. The possible role of differences in social comparisons in mediating these interactional effects is discussed.

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