Crustaceans

This study aimed to enhance our insight on the potential toxicological effects of silver nanoparticles (AgNPs) into the aquatic environment. To investigate the chronic toxicity of nanoparticles, freshwater micro-crustacean Daphnia lumholtzi was exposed to different concentrations of 0.2, 0.5 µg/l AgNPs, and control, for 21 days.

8p viamman2711 07-08-2020 34 3   Download

The thesis aims to obtain data on freshwater crustacean composition in the water bodies of Phong Nha - Ke Bang National Park. Identify the characteristics of quantity distribution of freshwater crustaceans in the study areas along with the changes of this group in terms of space and climate season. Proposing solutions to conservation of specific and important types of SE in limestone areas of Phong Nha and Quang Binh national parks.

27p xacxuoc4321 11-07-2019 62 5   Download

Tôm càng xanh (Macrobrachium rosenbergii) là một trong những đối tượng thủy sản nước ngọt có giá trị kinh tế cao ở Việt Nam và nhiều nơi trên thế giới. Tuy nhiên sản lượng tôm càng xanh nuôi còn thấp, chưa đáp ứng được nhu cầu trong nước và thị trường thế giới. Nghề nuôi tôm càng xanh hiện nay vẫn còn phụ thuộc hoàn toàn vào nguồn tôm giống tự nhiên hoặc là nguồn tôm giống chưa được chọn giống nâng cao chất lượng di truyền. Vì vậy nuôi tôm càng xanh đạt sản lượng thấp và dễ mẫn cảm với dịch bệnh, ảnh...

10p kem3mau 11-06-2013 73 5   Download

The isoprenoid methyl farnesoate (MF) has been implicated in the regulation of crustacean development and reproduction in conjunction with eyestalk molt inhibiting hormones and ecdysteroids. Farnesoic acid O-methyltransferase (FAMeT) catalyzes the methylation of farnesoic acid (FA) to produce MF in the terminal step of MF synthesis. We have previously cloned and characterized the shrimp FAMeT. In the present study, recombinant FAMeT (rFAMeT) was produced for bioassay and antiserum generation.

9p research12 01-06-2013 41 3   Download

The currently accepted model of moult control in crusta-ceans relies entirely on the hypothesis that moult-inhibiting hormone (MIH) and crustacean hyperglycaemic hormone (CHH) repress ecdysteroid synthesis of the target tissue (Y-organ) only during intermoult, and that changes in syn-thesis and/or release of these neurohormones are central to moult control.

9p tumor12 20-04-2013 51 3   Download

The small heat shock proteins function as molecular chaperones, an activ-ity often requiring reversible oligomerization and which protects against irreversible protein denaturation. An abundantly produced small heat shock protein termed p26 is thought to contribute to the remarkable stress resistance exhibited by encysted embryos of the crustacean,Artemia francis-cana. Three novel sequence motifs termed G, R and TS were individually deleted from p26 by site-directed mutagenesis.

14p fptmusic 12-04-2013 44 4   Download

The hemocyanin of the tiger shrimp,Penaeus monodon, was investigated with respect to stability and oxygen binding. While hexamers occur as a major component, dodecamers and traces of higher aggregates are also found. Both the hexamers and dodecamers were found to be extremely sta-ble against dissociation at high pH, independently of the presence of cal-cium ions, in contrast to the known crustacean hemocyanins.

16p awards 06-04-2013 35 3   Download

We report here the identification of a tachykinin-related peptide (TRP) in crustaceans. Direct MALDI-TOF MS withbrainslicesof the crayfishProcambarus clarkiiindicated the presence of a peptide having an MS number of around 934. Quadrupole orthogonal acceleration time-of-flight (Q-TOF) MS/MS analysis implied the sequence to be APSGFLGMRamide, identical to that of CabTRP Ia, isolated previously from the crab Cancer borealis,and Pev-tachykinin, from the shrimpPenaeus vannamei.

11p dell39 03-04-2013 36 2   Download

Crustacean growth and development is characterized by periodic shedding (ecdysis) and replacement of the rigid exoskeleton. Secretions of the X-organ sinus gland complex control the cellular events that lead to growth and molting. Western blot and ELISA results showed a progressive increase in growth arrest-specific protein (Gas7) from early postmolt stage to a maximum at late postmolt stage.

8p dell39 27-03-2013 54 3   Download

Crustacean hyperglycemic hormone (CHH) and vitellogenesis-inhibiting hormone (VIH), produced by the X organ–sinus gland neurosecretory com-plex, belong to a peptide group referred to as the CHH family, which is widely distributed in arthropods. In this study, genetic variants and post-translationally modified isoforms of CHH and VIH were characterized in the European lobster Homarus gammarus.

10p inspiron33 26-03-2013 51 4   Download

Oviparous development in the extremophile crustacean,Artemia franciscana, generates encysted embryos which enter a profound state of dormancy, termed diapause. Encystment is marked by the synthesis of p26, a polydis-perse small heat shock protein thought to protect embryos from stress.

15p inspiron33 26-03-2013 41 5   Download

Many branchiopod crustaceans are endowed with extracellular, high-molecular-weight hemoglobins whose exact structural characteristics have remained a matter of conjecture. By using a broad spectrum of techniques, we provide precise and coherent information on the hemoglobin of one of the phylogenetically ‘oldest’ extant branchiopods, the tadpole shrimp Triops cancriformis.

17p inspiron33 25-03-2013 42 4   Download

The crustacean hyperglycemic hormone (CHH) plays an important role in the regulation of hemolymph glucose levels, but it is also involved in other functions such as growth, molting and reproduction. In the present study we describe the first CHH family gene isolated from the Atlantic Ocean shrimp Litopenaeus schmitti.

9p inspiron33 23-03-2013 43 4   Download

Branchiopod crustaceans are endowed with extracellular, high-molecular-mass hemoglobins (Hbs), the functional and allosteric properties of which have largely remained obscure. The Hb of the phylogenetically ancientTri-ops cancriformis(Notostraca) revealed moderate oxygen affinity, coopera-tivity and pH dependence (Bohr effect) coefficients: P50¼13.3 mmHg, n50¼2.3, andu¼)0.18, at 20C and pH 7.44 in Tris buffer. Thein vivo hemolymph pH was 7.52.

18p galaxyss3 19-03-2013 50 5   Download

The neuropeptides of the crustacean hyperglycaemic hormone (CHH) family are encoded by a multigene family and are involved in a wide spec-trum of essential functions. In order to characterize CHH family peptides in one of the last groups of decapods not yet investigated, CHH was stud-ied in two anomurans: the hermit crab Pagurus bernhardusand the squat lobster Galathea strigosa.

14p media19 05-03-2013 28 2   Download

The rapid increase in the number of putative cDNA sequences encoding crustacean hyperglycemic hormone (CHH) family in various tissues [either from the eyestalk (ES) or elsewhere] underscores a need to identify the corresponding neuropeptides in relevant tissues.

12p media19 05-03-2013 29 3   Download

Although the crustacean crustacean hyperglycemic hormone⁄molt-inhibi-ting hormone⁄gonad-inhibiting hormone neuropeptides have been studied extensively in the last two decades and several neuropeptides from the shrimpMetapenaeus ensishave been cloned, the functions of most of these neuropeptides remained putative.

11p media19 04-03-2013 42 2   Download

d-aminoacyl residues have been detected in various animal peptides from several taxa, especially vertebrates and arthropods. This unusual polymor-phism was shown to occur in isoforms of the crustacean hyperglycaemic hormone (CHH) of the American lobster because ad-phenylalanyl residue was found in position 3 of the sequence (CHH andd-Phe3 CHH).

13p vinaphone15 25-02-2013 35 2   Download

In the present study, an isoform of angiotensin-converting enzyme was characterized from the testis of a decapod crustacean, the crayfish Asta-cus leptodactylus. Angiotensin-converting enzyme cDNA, obtained by 3¢-to5¢ RACE of testis RNAs, codes for a predicted one-domain protein similar to the mammalian germinal isoform of angiotensin-converting enzyme.

12p vinaphone15 25-02-2013 34 3   Download

Crustacean serine proteases (Brachyurins, EC 3.4.21.32) exhibit a wide variety of primary specificities and no member of this family has been reported for spiny lobsters. The aim of this work was to study the diversity of trypsins in the digestive gland ofPanulirus argus.

13p viettel02 19-02-2013 36 5   Download