a Successful Marking Method for the Saucer Scallop Amusium balloti (Bernardi)

1978 ◽  
Vol 29 (6) ◽  
pp. 845 ◽  
Author(s):  
D Heald
Keyword(s):  
Sea Water ◽  
Shell Height ◽  
Field Method ◽  
The Other ◽  
Release Date ◽  
Short Lifespan ◽  
Cyanoacrylate Adhesive ◽  
Metal Titanium ◽  
Monel Metal

Wired-on Petersen discs, tags of monel metal, titanium and plastic attached with δ-cyanoacrylate adhesive, Epitar patches over plastic tags, and Epitar numbers were tested in the search for a suitable field method by which to mark the scallop A. balloti for growth and movement studies. A plastic tag stuck on with δ-cyanoacrylate, an adhesive which hardens in sea water, had the lowest mean probability of loss in recoveries up to 17 months after release. The other advantages of this method were: (1) there was no damage to the shell or organism, (2) the method was quick, which minimized exposure to air, (3) the colour range available in the tags enabled coding of release date and area and the option of either blending or contrasting with the scallop's natural shell colours, and (4) there was no need to record shell height at release (experiments 7-11). The short lifespan of this scallop (about 4 years) prevented the attainment of information over longer periods.

Komparasi Unsur Budaya (Kepercayaan) pada Masyarakat Talaga, Majalengka dan Masyarakat Nagoya, Jepang

Metahumaniora ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 306
Author(s):  
Asri Soraya Afsari
Keyword(s):  
Qualitative Method ◽  
Field Method ◽  
The Other ◽  
Survey Method ◽  
Cultural Comparison ◽  
Other Hand ◽  
The People ◽  
Descriptive Qualitative

AbstrakPenelitian ini bertujuan mengkaji perbandingan kepercayaan masyarakat Talagadi Majalengka dan masyarakat Nagoya di Jepang. Kepercayaan yang dimaksud dalampenelitian ini adalah kepercayaan yang berhubungan dengan tabu atau pamali dankepercayaan yang berhubungan dengan keberuntungan pada kedua masyarakat tersebut.Untuk mencapai tujuan tersebut digunakan metode deskripstif kualitatif. Dalam memupudata digunakan metode lapangan karena peneliti terjun langsung ke masyarakat. Disamping itu, digunakan pula metode survey melalui penyebaran daftar kuesioner. Hasilpenelitian menunjukkan bahwa bentuk kepercayaan yang berhubungan dengan tabu ataupamali pada masyarakat Talaga dan Nagoya meliputi kegiatan yang dilakukan oleh manusia.Adapun kepercayaan yang berhubungan dengan keberuntungan pada kedua masyarakattersebut berkaitan dengan binatang, benda, dan kegiatan manusia. Sampai saat ini baikmasyarakat Talaga maupun Nagoya masih memegang teguh kepercayaan tersebut.Kata kunci: kepercayaan, Talaga, Nagoya, deskriptif kualitatif, komparasi budaya.AbstractThe aim of this research is to review the comparison of belief between the society ofTalaga in Majalengka and the society of Nagoya in Japan. The intended belief on this study isthe one related with a taboo or pamali, and the belief correlated to luck on both societies. Inachieving the goal, this research uses a descriptive qualitative method. To get the data, thewriter uses a field method that he (/she) directly involves with the people. On the other hand,the writer also uses a survey method by distributing questioners. The result shows that the beliefcorrelated with the taboo or pamali of Talaga and Nagoya societies covers the activities doneby human. Also with the belief related to luck of both societies corresponds to animals, things,and human’s activities. Until now, either Talaga society or Nagoya’s still keeps those beliefs.Keyword: belief, Talaga, Nagoya, descriptive qualitative, cultural comparison.

Part 2. The deeper structure of the Atlantic - Geological hypotheses and the earth's crust under the oceans

1954 ◽  
Vol 222 (1150) ◽  
pp. 341-348 ◽  
Keyword(s):  
Heat Flow ◽  
Recent Work ◽  
Sea Water ◽  
Volcanic Rocks ◽  
The Other ◽  
Ocean Floor ◽  
Peridotite Xenoliths ◽  
The Earth ◽  
Southern Rhodesia ◽  
Mohorovičić Discontinuity

Recent work has determined the depth of the Mohorovičić discontinuity at sea and has made it likely that peridotite xenoliths in basaltic volcanic rocks are samples of material from below the discontinuity. It is now possible to produce a hypothetical section showing the transition from a continent to an ocean. This section is consistent with both the seismic and gravity results. The possible reactions of the crust to changes in the total volume of sea water are dis­cussed. It seems possible that the oceans were shallower and the crust thinner in the Archean than they are now. If this were so, some features of the oldest rocks of Canada and Southern Rhodesia could be explained. Three processes are described that might lead to the formation of oceanic ridges; one of these involves tension, one compression and the other quiet tectonic conditions. It is likely that not all ridges are formed in the same way. It is possible that serpentization of olivine by water rising from the interior of the earth plays an important part in producing changes of level in the ocean floor and anomalies in heat flow. Finally, a method of reducing gravity observations at sea is discussed.

The unreliability of mammalian glomerular markers in teleostean renal studies

1976 ◽  
Vol 64 (2) ◽  
pp. 369-378 ◽  
Author(s):  
K. W. Beyenbach ◽  
L. B. Kirschner
Keyword(s):  
Polyethylene Glycol ◽  
Urinary Bladder ◽  
Glomerular Filtration ◽  
Sea Water ◽  
The Other ◽  
Salmo Gairdneri ◽  
Renal Tubules ◽  
True Measure

1. The assumption that (3H) methoxy inulin, (14C) polyethylene glycol (PEG) and (125) iothalamate (glofil) are reliable volume and glomerular markers in teleosts was tested. 2. PEG occupied smaller volumes than inulin and glofil in sea-water-adapted Salmo gairdneri. Ureteral clearances of PEG were about 22% higher than those of inulin and glofil, and urine-to-plasma ratios were significantly greater for PEG than for the other two markers. 3. After introduction into the urinary bladder the three macro-molecules appeared in the plasma, PEG at the lowest rates. 4. These observations indicate that mammalian glomerular markers can penetrate the bladder and possibly the ureters and renal tubules. Therefore, their clearances may not give a true measure of glomerular filtration rates in teleosts.

scholarly journals The density and distribution of Pacific Oyster (Crassostrea gigas) in Krueng Cut, Aceh Besar

2021 ◽  
Vol 869 (1) ◽  
pp. 012056
Author(s):  
M Ramadhaniaty ◽  
C Octavina ◽  
FA Putri ◽  
S Karina ◽  
Ichsan
Keyword(s):  
Crassostrea Gigas ◽  
Aquatic Environment ◽  
Random Sampling ◽  
Pacific Oyster ◽  
Sea Water ◽  
The Other ◽  
High Abundance ◽  
Nutrient Input ◽  
Oyster Population

Abstract Crassostrea gigas is a Pacific oyster that has the largest size among the other oysters. This oyster is most often found because of its ability to adapt to a variety of environments. Krueng Cut is an estuary area that gets a lot of nutrient input from sea water because it is directly adjacent to the ocean. This condition makes this area has a high abundance of oysters with high fishing and antropogenic activities as well. The purpose of this study was to determine the density and distribution of the oyster population from 3 representative stations along the estuary area of Krueng Cut. The method used in this study is random sampling using a quadratic transect. The results show that the highest density is indicated by station 3 with 55.67 ind/m2 and the lowest density is indicated by station 1 is 40.33 ind/m2. These results indicate that the activities of residents, the entry of contaminants from antropogenic affect the density of oysters. The distribution of oysters from the three stations showed similarities, namely they tended to grouping. The aquatic environment at the three research stations still supports the growth of oysters. This study confirms that there has been a decline in the population, which is characterized by a decrease in the number of catches and a smaller size of oysters.

scholarly journals XX. Discovery of the metamorphosis in the second type of the cirripedes, viz. the lepades, completing the natural history of these singular animals, and confirming their affinity with the crustacea

1835 ◽  
Vol 125 ◽  
pp. 355-358 ◽  
Keyword(s):  
North America ◽  
Natural History ◽  
Sea Water ◽  
The Other ◽  
External Appearance ◽  
The Real ◽  
Real Nature ◽  
History Of ◽  
The Mediterranean ◽  
The Waves

The Fourth Memoir, published in my Zoological Researches and Illustrations, No. III. page 69, &c., having first made known the real nature of the Cirripedes , the key of which remained concealed in their metamorphosis, it might have been expected that some naturalist favourably situated to investigate the oceanic tribe of these animals, would have been the first to make the same discovery in regard to these, and thereby complete their natural history. It was scarcely to be expected that the honour of this discovery also should be reserved for the author, fixed to one spot, where none of them naturally exist, and are but casually thrown upon our shores by the waves of the Atlantic, attached to pieces of wreck, or brought into port fixed to the bottoms of ships returning from distant voyages. Fortunately, however, two ships of this description came into this harbour (Cork), one from the Mediterranean, the other from North America, which, not being sheathed with copper, had their bot­toms literally covered with Barnacles of the three genera of Lepas , Cineras , and Otion ; and having persons employed expressly for the purpose, numbers of these were brought alive in sea water, amongst which were many with the ova in various stages of their progress, and some ready to hatch, which they eventually did in prodigious numbers, so as to enable him to add the proof of their being, like the Balani, natatory Crusta­cea in their first stage , but of a totally different facies and structure; a circumstance which determines the propriety of the separation of the Cirripedes into two tribes, and evinces the sagacity of Mr. MacLeay in being the first to indicate that these two tribes, the Balani and Lepades , were not so closely related as generally supposed. The larvæ of the Balani , described in Memoir IV. under the external appearance of the bivalve Monoculi ( Astracoda ), have a pair of pedunculated eyes, more numerous and more completely developed members, approximating to those of Cyclops , and of the perfect Triton ; while, in the present type, or Lepades , the larva resembles some­what that of the Cyclops , which Müller, mistaking for a perfect animal, named Amymone , and which can be shown to he common to a great many of the Entomostraca ; or the resemblance is still more striking to that of the Argulus Armiger of Latreille, which, in fact, is but an Amymone furnished with a tricuspidate shield at the back.

On the use of ammonium for buoyancy in squids

1979 ◽  
Vol 59 (2) ◽  
pp. 259-276 ◽  
Author(s):  
M. R. Clarke ◽  
E. J. Denton ◽  
J. B. Gilpin-Brown
Keyword(s):  
Developmental Stage ◽  
Sea Water ◽  
The Body ◽  
The Other ◽  
Neutral Buoyancy ◽  
Rich Solution ◽  
Almost All ◽  
Neutrally Buoyant

Squids (teuthoids) fall into two distinct groups according to their density in sea water. Squids of one group are considerably denser than sea water and must swim to stop sinking; squids in the other group are nearly neutrally buoyant. Analyses show that in almost all the neutrally buoyant squids large amounts of ammonium are present. This ammonium is not uniformly distributed throughout the body but is mostly confined to special tissues where its concentration can approach half molar. The locations of such tissues differ according to the species and developmental stage of the squid. It is clear that the ammonium-rich solution are almost isosmotic with sea water but of lower density and they are present in sufficient volume to provide the main buoyancy mechanism of these squids. A variety of evidence is given which suggests that squids in no less than 12 of the 26 families achieve near-neutral buoyancy in this way and that 14 families contain squids appreciably denser than sea water [at least one family contains both types of squid]. Some of the ammonium-rich squids are extremely abundant in the oceans.

Some Experiments on Sea-urchin Eggs with Desoxynucleic Acids from Sea-urchin Sperms

Development ◽  
1953 ◽  
Vol 1 (3) ◽  
pp. 261-262
Author(s):  
Sven Hörstadius
Keyword(s):  
New York ◽  
Sea Urchin ◽  
Sea Water ◽  
Water Injection ◽  
Dark Field ◽  
The Other ◽  
Columbia University ◽  
Sea Urchin Eggs ◽  
King's College ◽  
Fertilization Membrane

Dr. I. Joan Lorch, of King's College, London, and I have made some experiments on sea-urchin eggs with desoxynucleic acids (DNA) prepared from sperms of several sea-urchin species by Professor Erwin Chargaff, of Columbia University, New York. Unfertilized eggs did not react when put into a solution of DNA in sea-water. Injection of a small amount of DNA dissolved in Callan's solution had the following consequences. If the DNA did not mix with the cytoplasm but remained as a distinct droplet, the egg could be fertilized. The droplet moved slowly towards the surface and ran out of the egg. This sometimes only occurred after several cleavages. Such eggs developed normally. If, on the other hand, the DNA mixed with the cytoplasm the egg became activated. A fertilization membrane was raised. The surface layer in dark field changed in colour from yellow to white as is the case upon fertilization.

Displacement of Valine From Intact Sea-Urchin Eggs by Exogenous Amino Acids

1968 ◽  
Vol 3 (4) ◽  
pp. 515-527
Author(s):  
J. PIATIGORSKY ◽  
A. TYLER
Keyword(s):  
Amino Acids ◽  
Glutamic Acid ◽  
Sea Urchin ◽  
Sea Water ◽  
The Other ◽  
Metabolic Product ◽  
Primary Factor ◽  
Lytechinus Pictus ◽  
Sea Urchin Eggs ◽  
Neutral Amino Acids

Unfertilized and fertilized eggs of the sea urchin Lytechinus pictus were preloaded with [14C]valine and exposed to individual solutions of each of the twenty ‘coded’ [12C]amino acids in artificial sea water. After 1 h incubation the amount of radioactivity in the medium was determined. The radioactivity was effectively displaced by most of the other neutral [12C]amino acids that are known to compete with valine for uptake. A chromatographic test with fertilized eggs showed the displaced radioactivity to be [14C]valine and not some metabolic product. Addition of acidic, basic or some neutral amino acids that are known to be poor inhibitors of valine uptake did not cause significant quantities of label to appear in the medium. For the unfertilized eggs, the concentration of acid-soluble label remained many hundreds of times greater in the egg fluid than in the sea water. Tests indicated that efflux of [14C]valine and subsequent competition for re-entry is a primary factor responsible for the displacement phenomenon. That this may not be the sole factor is suggested by the fact that some amino acids that are known to be powerful inhibitors of valine uptake were found to be only weak displacers of [14C]valine. Neither [14C]arginine nor [14C]glutamic acid were displaced in significant amounts from preloaded unfertilized or fertilized eggs by any of the tested [12C]amino acids. Attempts were made to utilize the displacement of [12C]valine to elevate the incorporation of [14C]valine and of other labelled amino acids into protein by intact eggs. Unfertilized and fertilized eggs were pretreated with related [12C]amino acids and then exposed to [14C]valine or a mixture of [14C]amino acids. The results varied in the different tests, ranging from no significant increase to 2-fold.

Wolffish antifreeze protein genes are primarily organized as tandem repeats that each contain two genes in inverted orientation

1988 ◽  
Vol 8 (9) ◽  
pp. 3670-3675
Author(s):  
G K Scott ◽  
P H Hayes ◽  
G L Fletcher ◽  
P L Davies
Keyword(s):  
Tandem Repeats ◽  
Sea Water ◽  
Transcription Termination ◽  
Antifreeze Protein ◽  
The Other ◽  
Direct Repeats ◽  
Inverted Orientation ◽  
Single Region ◽  
Flanking Sequences ◽  
Anarhichas Lupus

The antifreeze protein genes of the wolffish (Anarhichas lupus) constitute a large multigene family of 80 to 85 copies, which can be classified into two sets. One-third of the genes were linked but irregularly spaced. The other two-thirds were organized as 8-kilobase-pair (kbp) tandem direct repeats that each contained two genes in inverted orientation; DNA sequence analysis suggests that both genes are functional. Except for a single region specific to each gene, the genes and their immediate flanking sequences were 99.2% identical. This degree of identity ended soon after a putative transcription termination sequence; as the 3' ends of the genes were only 1.3 kbp apart, these sequences might confer mutual protection from interference by transcriptional runoff. A Southern blot of wolffish DNA restricted with enzymes that do not cut within the tandem repeats indicated that the repeats were clustered in groups of six or more. The organization of antifreeze protein genes in the wolffish was very similar to that in the unrelated winter flounder, which produces a completely different antifreeze. This similarity might reflect common dynamics by which their progenitors adapted to life in ice-laden sea water.

Kinetics of Fertilization in the Sea Urchin: A Comparison of Methods

1970 ◽  
Vol 52 (2) ◽  
pp. 455-468
Author(s):  
R. PRESLEY ◽  
P. F. BAKER
Keyword(s):  
Sea Urchin ◽  
Uranyl Nitrate ◽  
Sea Water ◽  
Fertilization Rate ◽  
The Other ◽  
Jelly Coat ◽  
Cortical Responses ◽  
Direct Counting ◽  
Further Development ◽  
Kinetics Of

1. A method is described for the direct counting of male pronuclei in recently fertilized sea-urchin eggs. 2. Using this method, fertilization rate determinations were made to compare 30% artificial sea water (A.S.W.), isotonic KCl, sea water containing lauryl sulphate, calcium-free and magnesium-free A.S.W. containing EDTA, and sea water containing uranyl nitrate, as agents blocking fertilization but permitting further development of previously fertilized eggs. 3. 30% A.S.W. was found to be less satisfactory than the other agents, lacking instant effect, and tending to promote polyspermy. The other agents all gave sigmoid rate curves, that of uranyl nitrate lagging 15-25 sec. behind the others. 4. Evidence was found that uranyl nitrate acts at a later stage in fertilization than the other agents. 5. Sigmoid rate curves were found, except with 30% A.S.W., when eggs with the bulk of the jelly coat removed, and nicotine-treated eggs, were fertilized. 6. Analysis of sperm distribution among eggs from samples fertilized for more than 40 sec. confirmed that re-fertilization takes place at a lower rate than primary fertilization. 7. The processes blocked by KCl and uranyl nitrate were found to precede the cortical responses to fertilization, and the termination of nicotine sensitivity.

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