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Journal articles on the topic 'Attu'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 March 2023

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1

Talbot, Stephen S., Sandra Looman Talbot, and John W. Thomson. "Lichens of Attu Island, Alaska." Bryologist 94, no. 4 (1991): 421. http://dx.doi.org/10.2307/3243837.

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2

Kumar, Ashok. "EFFECTS OF CYPERMETHRIN ON HAEMATOLOGICAL MARKERSIN WALLAGO ATTU." International Journal of Biological Innovations 04, no. 01 (2022): 180–88. http://dx.doi.org/10.46505/ijbi.2022.4120.

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Wallago attu was exposed to five different concentrations of cypermethrin for 30 days and found a remarkable change in haemoglobin, TLC, PCV and TEC values. A surging rise was noticed in all the four parameters on exposure to the different concentration of cypermethrin on day 1 but there was a slight reduction in the haemoglobin content, PCV and TEC with a slight rise in TLC after few days. Wallago attu exposed to cypermethrin showed an increase in blood glucose level. Cypermethrin has potent piscicidal activity against Wallago attu and adversely affects.
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3

Hameed, Sultan, Henry H. Norwood, Michael Flanagan, Steven Feldstein, and Chien-hsiung Yang. "The Influence of El Niño on the Spring Fallout of Asian Bird Species at Attu Island." Earth Interactions 13, no. 7 (August 1, 2009): 1–22. http://dx.doi.org/10.1175/2009ei272.1.

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Abstract Several studies have documented the effect of the recent secular climate warming on the distributions and geographical ranges of birds. Here the authors report the strong impact of a recurring climatic pattern in the equatorial Pacific, the El Niño–Southern Oscillation (ENSO) cycle of warm (El Niño) and cold (La Niña) events, on spring migrants along the Far Eastern flyway in northeast Asia. In El Niño years, an unusually large number of birds that use the flyway are observed at Attu Island, westernmost of the Aleutian Islands, nearly 960 km away from the Asian coast. This study is based on a 20-yr dataset documenting the year-to-year variation of Asian birds arriving on Attu in the spring season and uses a three-phased analytical methodology to examine climate impacts on bird movements and populations. The authors offer evidence that birds are displaced toward the Attu area in strong eastward-moving storms. They also present results from a reverse trajectory model that was used to simulate trajectories that a sample of Attu arrivals likely followed in reaching the island. In a statistical analysis, it is shown that 79% of the variation of the Asian birds is explained by a single climate variable: sea surface temperature in the eastern equatorial Pacific in the previous fall. It is the rise in sea surface temperature in this region, more than 8000 km from Attu, that characterizes the onset of an El Niño episode. Examining those years for which there was a strong ENSO signal in the fall, it is found that the following May is characterized by anomalously strong westerly winds in the northwest Pacific, conditions that are appropriate for large Asian bird fallouts at Attu. Because of the time lag between the fall sea surface temperatures in the El Niño region and the spring Asian bird count at Attu, and the strong correlation between these two quantities, the number of Asian birds arriving at Attu in spring is predictable in the previous autumn. Such predictions are presented for several years.
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4

Ramesh Puri and Jayati Batra. "A Suspected Allergic Reaction to Boal Fish (Wallago Attu)." International Healthcare Research Journal 4, no. 9 (December 13, 2020): CR1—CR4. http://dx.doi.org/10.26440/ihrj/0409.12363.

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Consumption of fish has increased around the globe due to its high nutritional value and this has led to an increase in incidence of allergic reactions to fish. Reactions to fish are not only mediated by the immune system causing allergies but are often caused by proteins, metals, various toxins and parasites. Allergic reactions to fish can range from being mild and self-limiting to serious and life threatening. We report a case of an adult with suspected allergic reaction to Boal fish (Wallago Attu) who developed contact dermatitis during marinating process. Application of steroids and administration of oral antihistaminic led to a quick recovery.
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5

Dutta, Pinak, and Mita Dutta. "nalysis of Fatty Acid Composition in the Flesh of Boal (Wallagu Attu)." Biosciences, Biotechnology Research Asia 16, no. 2 (May 23, 2019): 477–81. http://dx.doi.org/10.13005/bbra/2762.

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The fatty acid composition of the muscle tissue of Wallagu attu found in Gangetic West Bengal, India was investigated to get an insight of its nutritional capacity. The fish muscle proved to be a rich source of both mono and poly unsaturated fatty acids. Of the saturated fatty acids Palmitic and Heneicosanoic acid is detected in considerable amount. Of the MUFA’s present Palmetoleic acid, Elaidic acid, Oleic acid and nervonic acid is found in good amount. Nutritionally important ω-6 PUFA’s like Linoleic acid and Arachidonic acid are found in the fish. EPA and DHA the two star ω-3 PUFA’s whose health benefits are beyond doubt are also detected in the fish. Wallagu attu is generally not farmed as it devours other fishes but considering its nutritional capacity and high market demands, its farming may prove beneficial for consumers and producers.
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6

Vo, Duc Nghia, Van Huy Nguyen, Duc Thanh Nguyen, Thi Thu An Le, Matthew J. Wylie, P. Mark Lokman, and Anh Tuan Nguyen. "Reproductive development of female wallago catfish (Wallago attu) in captivity." Animal Reproduction Science 242 (July 2022): 107014. http://dx.doi.org/10.1016/j.anireprosci.2022.107014.

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7

Mandal, Mrinmay, Nilanjana Das Chatterjee, and Suddhasattwa Burman. "BOAL (WALLAGO ATTU) FISH ABANDONMENT IN KELEGHAI RIVER, WEST BENGAL: AN IDEA BASED CLARIFICATION." Environment & Ecosystem Science 5, no. 1 (January 12, 2021): 23–26. http://dx.doi.org/10.26480/ees.01.2021.23.26.

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Aquatic freshwater fish diversity immensely declines from several native places in West Bengal. Lots of freshwater fish have been extricated and some become endangered or vulnerable in condition as well as in Keleghai river. Aquatic ecosystem meltdown or crisis due to anthropogenic intervention resulted disappearance of eco-sensitive species. Such, appearance of Boal (Wallago attu) fish in this river was very common but now it’s very amazing to see or to catch it. The number of this species decreased radically before some decades. The present study conducts an empirical investigation to find out the reasons are behind it. Lacking of printed information, the work concentrated on knowledge and perception of experienced fisherman for understanding the fact by interviewing method. After qualitative investigation, the study recommends that simplification of food web in this aquatic ecosystem is the major cause of abandonment of Attu fish in this river. Other important causes are advance unethical fishing techniques, habitat loss, and enormous use of chemical pesticide and fertilizer in wetlands.
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8

Chai, Yunrong, Ching Sung Tsai, Hongbaek Cho, and Stephen C. Winans. "Reconstitution of the Biochemical Activities of the AttJ Repressor and the AttK, AttL, and AttM Catabolic Enzymes of Agrobacterium tumefaciens." Journal of Bacteriology 189, no. 9 (February 16, 2007): 3674–79. http://dx.doi.org/10.1128/jb.01274-06.

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ABSTRACT The attKLM operon encodes a lactonase (AttM) that hydrolyzes acylhomoserine lactone autoinducers, as well as two putative dehydrogenases (AttK and AttL). Here we show that AttK, AttL, and AttM collectively covert gamma-butyrolactone to succinate. Two metabolic intermediates, gamma-hydroxybutyrate and succinic semialdehyde, inactivated the AttJ repressor in vitro and induced attKLM transcription in vivo.
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9

Adak, Shanta, and Buddhadeb Manna. "Excretory–Secretory Protein of Wallago attu-Infesting Isoparorchis hypselobagri (Billet, 1898)." Proceedings of the Zoological Society 68, no. 2 (July 6, 2014): 155–58. http://dx.doi.org/10.1007/s12595-014-0114-7.

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10

Talbot, Stephen S., and Sandra Looman Talbot. "Numerical classification of the coastal vegetation of Attu Island, Aleutian Islands, Alaska." Journal of Vegetation Science 5, no. 6 (December 1994): 867–76. http://dx.doi.org/10.2307/3236199.

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11

Hussain, Bilal, Maleeha Fatima, Khalid Abdullah Al-Ghanim, and Shahid Mahboob. "Environmentally induced nephrotoxicity and histopathological alternations in Wallago attu and Cirrhinus mrigla." Saudi Journal of Biological Sciences 26, no. 4 (May 2019): 752–57. http://dx.doi.org/10.1016/j.sjbs.2019.02.003.

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12

Lilabati, H., and W. Vishwanath. "Nutritional quality of fresh water catfish (Wallago attu) available in Manipur, India." Food Chemistry 57, no. 2 (October 1996): 197–99. http://dx.doi.org/10.1016/0308-8146(95)00187-5.

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13

Chandra, Sudhish. "Impact of changing ecophysiological conditions in blood urea levels of freshwater fish Wallago attu." Journal of Applied and Natural Science 1, no. 1 (June 1, 2009): 47–49. http://dx.doi.org/10.31018/jans.v1i1.33.

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Definite cyclic variations were observed in blood urea levels of freshwater catfish Wallago attu. The maximal mean blood urea level (8.44±1.96 mg/100 ml) was noted in the month of June while minimal level in December, revealing a difference of 65.87% between the two levels. Seasonal alterations observed here in W. altu were correlated with ecophysiological factors like temperature, food availability, body metabolism, breeding cycle and hormonal changes which have been essentially found to be involved in fish life.
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14

Pradhan, Chiranjiv. "Evaluation of nutritive value, fatty acid composition and lipid quality indices of freshwater catfishes and murrels." Journal of Aquaculture & Marine Biology 9, no. 3 (2020): 80–85. http://dx.doi.org/10.15406/jamb.2020.09.00281.

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The study was conducted to determine the nutritive value in terms of proximate composition, fatty acid (FA) profile and lipid quality indices off our catfish species (Wallago attu, Ompok pabda, Clarias gariepinus, Pangasidon hypophthalmus) and two murrel species (Channa striatus, Channa punctatus) from Odisha, India. Among the species investigated the maximum fillet protein (22.35%) and lipid (13.45%) was recorded in C. striatus and C. gariepinus, respectively. All the fish species showed a FA profile of saturated fatty acid (SFA)> mono unsaturated fatty acid (MUFA)>poly unsaturated fatty acid (PUFA). The n-3 PUFA distribution in the experimental species was observed as docosahexaenoic acid (DHA, 22:6 n-3)>alpha linolenic acid (ALA, 18:3 n-3)>eicosapentaenoic acid (EPA, 20:5 n-3) except C. gariepinus. The fillet EPA and DHA content of two murrel species and W. attu were similar and significantly higher (P<0.05) among the species. Similarly these three species viz., W. attu, C. striatus and C. punctatus showed maximum DHA quantity in their fillet. The n-6/n-3 ratios in five species except C. gariepinus were below 4.0. The athrogenic index (IA) and thrombogenic index (IT) were<1 and cholesterolomic index (h/H) for all species were>1, suitable for human health. Overall, considering nutritive value, fillet protein and very essential fatty acids, the experimental species can be arranged in the following order C. Straitus>C. punctatus=W. attu>P. Hypophthalmus>O. Pabda>C. gariepinus.
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15

Tobish, Theodore G., and Lawrence G. Balch. "First North American Nesting and Occurrence of Haliaeetus albicilla on Attu Island, Alaska." Condor 89, no. 2 (May 1987): 433. http://dx.doi.org/10.2307/1368501.

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16

Dubey, Akhilesh, Mukunda Goswami, Kamalendra Yadav, and Bhagwati S. Sharma. "Development and characterization of a cell line WAF from freshwater shark Wallago attu." Molecular Biology Reports 41, no. 2 (January 1, 2014): 915–24. http://dx.doi.org/10.1007/s11033-013-2936-1.

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17

Hossain, Md Yeamin, Zoarder Faruque Ahmed, Jun Ohtomi, Abu Hanif Md Ibrahim, Mohamed A. H. El-kady, Bernerd Fulanda, and Susanta Kumar Chakraborty. "Threatened fishes of the world: Wallago attu (Bloch and Schneider, 1801) (Siluriformes: Siluridae)." Environmental Biology of Fishes 82, no. 3 (August 21, 2007): 277–78. http://dx.doi.org/10.1007/s10641-007-9281-y.

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18

Majumdar, Bhaskar Chandra, Faria Afrin, Md Golam Rasul, Murshida Khan, and A. K. M. Azad Shah. "Comparative study of physical, chemical, microbiological and sensory aspects of some sun dried fishes in Bangladesh." Brazilian Journal of Biological Sciences 4, no. 8 (2017): 323–31. http://dx.doi.org/10.21472/bjbs.040811.

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An investigation was carried out to compare the physical, chemical, microbiological and sensory properties of three freshwater dried fish products of Wallago attu Bloch & Schneider, 1801 (Siluriformes: Siluridae), Channa striatus (Bloch, 1793) (Perciformes: Channidae) and Glossogobius giuris (F. Hamilton, 1822) (Perciformes: Gobiidae). The traditionally sun dried fishes were collected from Kawran Bazar Fish Market, Dhaka, Bangladesh. Results showed that the water reconstitution properties varied among the dried fishes where maximum rehydration was observed in the C. striatus at room temperature, 40 oC and 60 oC. Moisture content of W. attu, C. striatus and G. giuris were 22.70% +/- 0.45%, 18.75% +/- 0.58% and 21.93% +/- 0.54%, respectively; the protein content were 61.85% +/- 0.99%, 66.44% +/- 1.02% and 62.83% +/- 0.87%, respectively; the lipid content were 6.21% +/- 0.93%, 6.81% +/- 0.72% and 5.98% +/- 0.55%, respectively, and the ash content were 6.79% +/- 1.11%, 6.49% +/- 1.29% and 7.83% +/- 0.98%, respectively. Peroxide value, acid value, pH, TVB N value and aerobic plate count were found to be highest in W. attu followed by G. giuris and C. striatus. Results of this study revealed that traditionally sun dried fish products were acceptable quality in terms of physico-chemical, microbiological and sensory aspects.
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19

Heusser, Calvin J. "Late Quaternary vegetation of the Aleutian Islands, southwestern Alaska." Canadian Journal of Botany 68, no. 6 (June 1, 1990): 1320–26. http://dx.doi.org/10.1139/b90-168.

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Late Quaternary vegetational history of the Aleutian Islands is interpreted from fossil pollen and spore stratigraphy and radiocarbon chronology of sections of mires on the islands of Attu, Adak, Atka, and Umnak. Mires postdate the withdrawal of ice-age glaciers between approximately 12 000 and 10 000 years ago with the exception of the mire on Attu Island, where deglaciation apparently began as late as 7000 years ago. No uniform pattern of change in Pacific coastal tundra communities is evident in the fossil assemblages. Pollen assemblages, consisting variably of Gramineae, Cyperaceae, Empetrum, Umbelliferae, Salix, Ranunculaceae, Compositae, Polypodiaceae, and Lycopodium, reflect conditions in effect in different sectors of the Aleutian chain. Climate, soil, topography, volcanism, and seismic activity are noteworthy parameters influencing vegetation composition and distribution. Volcanism has been of major importance, as shown by thickness, distribution, and frequency of tephra layers that number 5 on Attu, 24 on Adak, 17 on Atka, and 5 on Umnak. A repeated condition of patch dynamics, created in the main by recurrent volcanic eruptions with widespread accompanying ashfalls, has apparently overprinted the effects of climatic change. Key words: Aleutian Islands, Quaternary, vegetation, fossil pollen, volcanism.
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20

Stendal, Henrik, Robert Frei, and Bo Møller Stensgaard. "A lead isotope study of an Archaean gold prospect in the Attu region, Nagssugtoqidian orogen, West Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 11 (December 5, 2006): 53–60. http://dx.doi.org/10.34194/geusb.v11.4916.

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This paper presents a lead isotope investigation of a gold prospect south of the village Attu in the northern part of the Nagssugtoqidian orogen in central West Greenland. The Attu gold prospect is a replacement gold occurrence, related to a shear/mylonite zone along a contact between orthogneiss and amphibolite within the Nagssugtoqidian orogenic belt. The mineral occurrence is small, less than 0.5 m wide, and can be followed along strike for several hundred metres. The mineral assemblage is pyrite, chalcopyrite, magnetite and gold. The host rocks to the gold prospect are granulite facies ‘brown gneisses’ and amphibolites. Pb-isotopic data on magnetite from the host rocks yield an isochron in a 207Pb/204Pb vs. 206Pb/204Pb diagram, giving a date of 3162 ± 43 Ma (MSWD = 0.5). This date is interpreted to represent the age of the rocks in question, and is older than dates obtained from rocks elsewhere within the Nagssugtoqidian orogen. Pb-isotopic data on cataclastic magnetite from the shear zone lie close to this isochron, indicating a similar origin. The Pb-isotopic compositions of the ore minerals are similar to those previously obtained from the close-by ~2650 Ma Rifkol granite, and suggest a genetic link between the emplacement of this granite and the formation of the ore minerals in the shear/mylonite zone. Consequently, the age of the gold mineralisation is interpreted to be late Archaean.
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Boateng, Richard, Alfred Sekyere Mbrokoh, Lovia Boateng, Prince Kwame Senyo, and Eric Ansong. "Determinants of e-learning adoption among students of developing countries." International Journal of Information and Learning Technology 33, no. 4 (August 1, 2016): 248–62. http://dx.doi.org/10.1108/ijilt-02-2016-0008.

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Purpose – The purpose of this paper is to investigate the determinants of e-learning adoption (ELA) among students in the University of Ghana. Design/methodology/approach – A quantitative research approach comprising of a survey of 337 students was adopted. Data were collected using questionnaires designed in conjunction with 13 factors (computer self-efficacy (CSE), perceived ease of use (PEOU), perceived usefulness (PU) and attitude towards use (ATTU)) in the conceptual model of the study. Data analysis was conducted using structural equation modelling. Findings – The result revealed that PU and ATTU had a direct effect on ELA whilst, PU and PEOU also had a direct relationship on ATTU. Other variables such as CSE and PEOU had an indirect relationship on ELA though they were found to have an insignificant direct relationship on ELA. Practical implications – The level of significance of each construct identified in the study provide practical guidance to school administrators and instructors as to which factors to pay close attention to when implementing e-learning projects within their respective institutions. Originality/value – This study provides insight into ELA from the students’ perspective, through an extension of the TAM model in a developing country context given the existence of cultural differences and societal idiosyncrasies which exist in different contexts, particularly in Africa.
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22

Matthysse, Ann G., and Susan McMahan. "Root Colonization by Agrobacterium tumefaciens Is Reduced in cel, attB,attD, and attR Mutants." Applied and Environmental Microbiology 64, no. 7 (July 1, 1998): 2341–45. http://dx.doi.org/10.1128/aem.64.7.2341-2345.1998.

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ABSTRACT Root colonization by Agrobacterium tumefaciens was measured by using tomato and Arabidopsis thaliana roots dipped in a bacterial suspension and planted in soil. Wild-type bacteria showed extensive growth on tomato roots; the number of bacteria increased from 103 bacteria/cm of root length at the time of inoculation to more than 107 bacteria/cm after 10 days. The numbers of cellulose-minus and nonattachingattB, attD, and attR mutant bacteria were less than 1/10,000th the number of wild-type bacteria recovered from tomato roots. On roots of A. thalianaecotype Landsberg erecta, the numbers of wild-type bacteria increased from about 30 to 8,000 bacteria/cm of root length after 8 days. The numbers of cellulose-minus and nonattaching mutant bacteria were 1/100th to 1/10th the number of wild-type bacteria recovered after 8 days. The attachment of A. tumefaciens to cut A. thaliana roots incubated in 0.4% sucrose and observed with a light microscope was also reduced with cel andatt mutants. These results suggest that cellulose synthesis and attachment genes play a role in the ability of the bacteria to colonize roots, as well as in bacterial pathogenesis.
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23

Sykes, Paul W., and David W. Sonneborn. "First Breeding Records of Whooper Swan and Brambling in North America at Attu Island, Alaska." Condor 100, no. 1 (February 1998): 162–64. http://dx.doi.org/10.2307/1369909.

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24

Laghari, Muhammad Younis, Punhal Lashari, Peng Xu, Zixia Zhao, Li Jiang, Naeem Tariq Narejo, Baoping Xin, Xiaowen Sun, and Yan Zhang. "Complete mitochondrial genome of freshwater sharkWallago attu(Bloch & Schneider) from Indus River Sindh, Pakistan." Mitochondrial DNA 27, no. 1 (April 8, 2014): 518–19. http://dx.doi.org/10.3109/19401736.2014.905836.

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25

Braun, Clait E., William P. Taylor, Steven M. Ebbert, and Lisa M. Spitler. "Monitoring Rock Ptarmigan (Lagopus muta) populations in the Western Aleutian Islands, Alaska." Canadian Field-Naturalist 133, no. 1 (September 20, 2019): 49–55. http://dx.doi.org/10.22621/cfn.v133i1.1948.

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Knowledge of population fluctuations of Aleutian Islands Rock Ptarmigan (Lagopus muta) is limited because of isolation and access. We reviewed the available but limited data on ptarmigan counts on islands in North America and evaluated the use of point counts to estimate changes in apparent numbers of Rock Ptarmigan on three islands (Adak, Amchitka, and Attu) in the Western Aleutian Islands in Alaska. We developed a standardized protocol to count numbers of Rock Ptarmigan (males and females) seen and/or heard on 5-minute point counts at 0.8 km intervals along marked global positioning system routes on Adak (2015–2017), Amchitka (2015), and Attu (2015) islands. Apparent densities based on Rock Ptarmigan seen and/or heard at 98 stops on 10 routes varied and were highest (1.9 birds per stop in 2015, 1.4 in 2016, and 1.0 in 2017) on Adak, lower (0.4 birds per stop) on Amchitka, and lowest (0.0 birds per stop) on Attu in late May–early June 2015. These island populations represent three subspecies and unique conservation units. Continuation of point-count surveys of these three subspecies in future years will provide baseline data over time and lead to a better understanding of any fluctuations in and synchrony among Rock Ptarmigan populations on these islands. This information is necessary for both theoretical (how are ptarmigan breeding populations regulated on islands) and practical reasons (identifying the optimal period for possible translocation to islands where ptarmigan were extirpated by introduced Arctic Fox [Vulpes lagopus]).
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Nghĩa, Võ Đức, Nguyễn Đức Thành, Lê Thị Thu An, Phan Thanh Hiệp, and Nguyễn Văn Huy. "ẢNH HƯỞNG CỦA MẬT ĐỘ VÀ TẦN SUẤT CHO ĂN ĐẾN HIỆU QUẢ ƯƠNG GIỐNG VÀ STRESS Ở CÁ LEO – Wallago attu (Bloch & Schneider, 1801)." Tạp chí Khoa học và công nghệ nông nghiệp Trường Đại học Nông Lâm Huế 5, no. 3 (November 24, 2021): 2633–44. http://dx.doi.org/10.46826/huaf-jasat.v5n3y2021.806.

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Nhằm xác định ảnh hưởng của mật độ và tần suất cho ăn đến sinh trưởng và tỉ lệ sống cá Leo Wallago attu giai đoạn ương giống, thí nghiệm được tiến hành với 5 mức mật độ (1, 2, 4, 8 và 16 con/L) và các tần suất cho ăn (1, 2, 3, 4 và 5 lần/ngày). Kết quả nghiên cứu cho thấy mật độ ương và tần suất cho ăn đã ảnh hưởng có ý nghĩa thống kê đến tỉ lệ sống của cá thí nghiệm. Tỉ lệ sống của cá giảm ở mật độ ương nuôi cao (p<0,05). Tỉ lệ ăn thịt đồng loại giảm ở các nghiệm thức mật độ nuôi thấp. Tần suất cho cá ăn có tương quan thuận với tỉ lệ sống, tỉ lệ sống của cá tăng trên 50% khi tăng số lần cho ăn lên 3 – 5 ngày/lần. Tỉ lệ ăn thịt đồng loại của cá có mối tương quan nghịch với tần suất cho ăn. Nồng độ cortisol trong máu cá được xem như chỉ thị đối với mức độ stress của cá. Kết quả của nghiên cứu này cho thấy rằng nồng độ cortisol của cá Leo ở mật độ nuôi cao và tần suất cho ăn 1 và 2 lần/ngày cao hơn so với những nghiệm thức còn lại. Do vậy, mức độ stress của cá Leo có thể được xem như một trong những yếu tố chính dẫn đến hiện tượng ăn thịt lẫn nhau và làm giảm tỉ lệ sống đối với loài cá này ở giai đoạn giống. Những kết quả của nghiên cứu này có thể cung cấp thông tin hữu ích nhằm nâng cao hiệu quả của việc ương nuôi cá Leo giống thông qua quản lý mật độ nuôi và tần suất cho ăn. ABSTRACT In order to elucidate the effects of stocking density and feeding frequency on the growth and survival of Wallago attu, post-hatch larvae were stocked at different densities (1, 2, 4, 8 and 16 individuals per liter) and fed with (1, 2, 3, 4 and 5-times per day). The results indicate that stocking density and feeding frequency had significant influences on the survival rate of the larvae (p<0.05). In particular, the survival rate of larvae decreased at trials with high stocking density (p<0.05) due to the cannibalism. The percentage of cannibalism decreased in treatments with low stocking densities. Regarding effects of feeding frequency, the proportionality between the survival rate of larvae and high feeding frequency was observed in this study (p<0.05). The survival rate of larvae reached 50% when fish were fed 3 -5 times per day. The cannibalism had negative relationship with frequency of daily feeding. The cortisol concentration in fish blood is considered as an indicator of stress levels of fish. The results of this study indicated that cortisol concentration of W. attu reared at high stocking density and fed 1-2 times/day was higher than that in other treatments. Therefore, stress levels of W. attu could be one of the main factors causing cannibalism and reduction of survival rate at larval stages. This study provided useful information to enhance the effectiveness of larval rearing of W. attu via controlling stocking density and feeding frequency.
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Agrawal, N., S. Rajvanshi, and A. Asthana. "Intraguild interactions between five congeneric species of Thaparocleidus (Monogenoidea) from the freshwater shark Wallago attu, Lucknow, India." Journal of Helminthology 91, no. 6 (January 30, 2017): 718–25. http://dx.doi.org/10.1017/s0022149x17000049.

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AbstractThe fish host (Wallago attu) and monogenoid parasite (Thaparocleidus sp.) have been recorded during 2 years (2011 and 2012) to investigate intra/interspecific interactions among query species (T. sudhakari (Gusev, 1976) Lim, 1996; T. indicus (Kulkarni, 1969) Lim, 1996; T. gomtius (Jain, 1952) Lim, 1996; T. yogendraii Agrawal, 1981 and T. wallagonius Jain, 1952) in the light of parasitic worm burden, morphological and molecular data. Each species is highly host specific (oioxenous), with a specialized functional niche. Being niche specialists, they exhibit niche overlapping along with co-existence due to reproductive barrier. Furthermore, a molecular marker, affirming clear-cut genetic variation in spite of structural entities, provides evidence for infra-speciation as well as co-speciation.
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Alam, Mohammad Zahangeer, Md Abdullahil Baki Bhuiyan, Hasan Muhammad Abdullah, Suma Rani Ghosh, Mohammad Maksudul Hassan, Ruzina Akter, M. Rokonuzzaman, and Mohammad Shah Alam. "Changes of Land Use and Land Cover with the Diversity of Fishes, Aquatic Plants, and Bird’s Species at Wetland Ecosystem." Scientific World Journal 2021 (December 8, 2021): 1–15. http://dx.doi.org/10.1155/2021/7533119.

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Bangladesh is rich in wetland biodiversity with aquatic plants, fishes, and birds. Mohanganj Upazila is known as the capital of lower Bangladesh. The present study focuses on the changes of land use and land cover (LULC) with a diversity of species that are being least concerned (LC), vulnerable (VU), and endangered (EN). Over the last two decades, the wetland species of Mohanganj were gradually declined. Our results showed that 19 fish, 4 aquatic plants, and 7 bird species were LC in 2015. Among the fish and aquatic plant species, 6 fish species (Wallago attu, Ompok pabda, Channa punctate, Chitala chitala, Salmostoma phulo, and Corica soborna) and 2 aquatic plant species (Nymphaea nouchali and Nymphaea lotus) were VU during the dry and rainy season of 2017 and 2019, respectively. In the dry season of 2019, 4 fish species (W. attu, O. pabda, C. punctate, and Ch. chitala), 2 aquatic plant species (N. nouchali and N. lotus), and 7 bird species (Anas platyrhynchos, Ardeola grayii, Gyps bengalensis, Alcedo atthis, Phalacrocorax fuscicollis, Porphyrio porphyria, and Larus ridibundus) were EN. Among the species, W. attu, N. nouchaii, G. bengalensis, P. porphyria, and L. ridibundus were extremely endangered categories. Changes in LULC, the establishment of settlements for the increasing population, indiscriminate use of pesticides, environmental pollutions, and climate change are the potential reasons for declining trends of wetland biodiversity. Stern actions on land use policy, expansion of organic agriculture, bioremediation of industrial effluents, and adoption of sustainable environmental policies should be taken by the Government of Bangladesh for immediate conservation of wetland biodiversity.
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Guo, Yanan, Xiaoqun Cao, Bainian Liu, and Mei Gao. "Cloud Detection for Satellite Imagery Using Attention-Based U-Net Convolutional Neural Network." Symmetry 12, no. 6 (June 25, 2020): 1056. http://dx.doi.org/10.3390/sym12061056.

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Cloud detection is an important and difficult task in the pre-processing of satellite remote sensing data. The results of traditional cloud detection methods are often unsatisfactory in complex environments or the presence of various noise disturbances. With the rapid development of artificial intelligence technology, deep learning methods have achieved great success in many fields such as image processing, speech recognition, autonomous driving, etc. This study proposes a deep learning model suitable for cloud detection, Cloud-AttU, which is based on a U-Net network and incorporates an attention mechanism. The Cloud-AttU model adopts the symmetric Encoder-Decoder structure, which achieves the fusion of high-level features and low-level features through the skip-connection operation, making the output results contain richer multi-scale information. This symmetrical network structure is concise and stable, significantly enhancing the effect of image segmentation. Based on the characteristics of cloud detection, the model is improved by introducing an attention mechanism that allows model to learn more effective features and distinguish between cloud and non-cloud pixels more accurately. The experimental results show that the method proposed in this paper has a significant accuracy advantage over the traditional cloud detection method. The proposed method is also able to achieve great results in the presence of snow/ice disturbance and other bright non-cloud objects, with strong resistance to disturbance. The Cloud-AttU model proposed in this study has achieved excellent results in the cloud detection tasks, indicating that this symmetric network architecture has great potential for application in satellite image processing and deserves further research.
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Verma, C., A. Chaudhary, and H. S. Singh. "Redescription and phylogenetic analyses of Thaparocleidus gomtius and T. sudhakari (Monogenea: Dactylogyridae) from Wallago attu (Siluriformes: Siluridae) in India." Helminthologia 54, no. 1 (March 1, 2017): 87–96. http://dx.doi.org/10.1515/helm-2017-0008.

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Summary Two species of Thaparocleidus Jain (1952a) were found harboring W. attu from the Ganga River at two localities, Meerut and Farrukhabad, Uttar Pradesh, India, during the period of 2013-2015. Morphology and morphometric study of specimens identified as Thaparocleidus gomtius (Jain, 1952a) Lim, 1996 and T. sudhakari (Gusev, 1976) Lim, 1996. Molecular analyses using the 18S rRNA gene confirmed the validity of T. gomtius and T. sudhakari and demonstrated that both the species clustered with other Thaparocleidus species from different geographical regions. We aim at reassessing the taxonomy and establishing the phylogenetic relationships among these two redescribed species with other representatives of the genus Thaparocleidus.
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Bajwa, Parteek, and J. K. Kondal. "Lipid and Protein Variation in Fish Processing Waste of Murrel, Channa striatus and Catfish, Wallago attu." Journal of Research: THE BEDE ATHENAEUM 8, no. 1 (2017): 114. http://dx.doi.org/10.5958/0976-1748.2017.00016.9.

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Braun, Clait E., William P. Taylor, and Steve E. Ebbert. "Changes in Evermann's Rock Ptarmigan Density on an Eastern Portion of Attu Island, Alaska, 2003–2009." Northwestern Naturalist 95, no. 1 (January 2014): 28–34. http://dx.doi.org/10.1898/nwn13-10.1.

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VERMA, Chandni, Anshu CHAUDHARY, and Hridaya Shanker SINGH. "Thaparocleidus gangus sp. nov. (Monogenea: Dactylogyridae) fromgill filaments of Wallago attu Bloch and Schn., 1801, India." TURKISH JOURNAL OF ZOOLOGY 40 (2016): 758–64. http://dx.doi.org/10.3906/zoo-1507-31.

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34

Achakzai, W. M., W. A. Baloch, S. Saddozai, and N. Memon. "Length-weight relationships (LWRs) of Wallago attu (Bloch and Schneider) from Manchar Lake Jamshoro, Sindh, Pakistan." Journal of Applied Ichthyology 29, no. 5 (February 21, 2013): 1172. http://dx.doi.org/10.1111/jai.12149.

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35

Ojha, Jagdish, and G. M. Hughes. "Effect of branchial parasites on the efficiency of the gills of a freshwater catfish, Wallago attu." Journal of Zoology 255, no. 1 (September 2001): 125–29. http://dx.doi.org/10.1017/s0952836901001170.

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36

PANDEY, S., S. PARVEZ, I. SAYEED, R. HAQUE, B. BINHAFEEZ, and S. RAISUDDIN. "Biomarkers of oxidative stress: a comparative study of river Yamuna fish Wallago attu (Bl. & Schn.)." Science of The Total Environment 309, no. 1-3 (June 20, 2003): 105–15. http://dx.doi.org/10.1016/s0048-9697(03)00006-8.

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37

Siraj, Muhammad, Muhammad Khisroon, and Ajmal Khan. "Bioaccumulation of Heavy Metals in Different Organs of Wallago attu from River Kabul Khyber Pakhtunkhwa, Pakistan." Biological Trace Element Research 172, no. 1 (December 5, 2015): 242–50. http://dx.doi.org/10.1007/s12011-015-0572-4.

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38

Zhang, Lin, Xijun Ou, Guoping Zhao, and Xiaoming Ding. "Highly Efficient In Vitro Site-Specific Recombination System Based on Streptomyces Phage φBT1 Integrase." Journal of Bacteriology 190, no. 19 (August 8, 2008): 6392–97. http://dx.doi.org/10.1128/jb.00777-08.

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ABSTRACT The Streptomyces phage φBT1 encodes a site-specific integrase of the large serine recombinase subfamily. In this report, the enzymatic activity of the φBT1 integrase was characterized in vitro. We showed that this integrase has efficient integration activity with substrate DNAs containing attB and attP sites, independent of DNA supercoiling or cofactors. Both intra- and intermolecular recombinations proceed with rapid kinetics. The recombination is highly specific, and no reactions are observed between pairs of sites including attB and attL, attB and attR, attP and attL, or attP and attR or between two identical att sequences; however, a low but significant frequency of excision recombination between attL and attR is observed in the presence of the φBT1 integrase alone. In addition, for efficient integration, the minimal sizes of attB and attP are 36 bp and 48 bp, respectively. This site-specific recombination system is efficient and simple to use; thus, it could have applications for the manipulation of DNA in vitro.
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39

Williams, Paul H., and Jennifer C. Thomas. "A bumblebee new to the New World: Bombus distinguendus (Hymenoptera: Apidae)." Canadian Entomologist 137, no. 2 (April 2005): 158–62. http://dx.doi.org/10.4039/n04-056.

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AbstractBombus (Subterraneobombus) distinguendus Morawitz, 1869 is recorded from Attu Island, in the western Aleutian archipelago, and is recognised as a species new to both the Alaskan and the New World faunal lists. Colour variation and food plants are described and a key to females of Nearctic Subterraneobombus species is provided.
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Paul, BN, S. Bhowmick, S. Chanda, N. Sridhar, and SS Giri. "Nutrient profile of five freshwater fish species." SAARC Journal of Agriculture 16, no. 2 (February 16, 2019): 25–41. http://dx.doi.org/10.3329/sja.v16i2.40256.

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The nutrient profile of five freshwater fish species viz., Mystus vittatus, Ompok bimaculatus, Channa striata, Wallago attu and Pangasianodon hypophthalmus were studied. The proximate composition data shows that the moisture and fat content differed significantly (P<0.01) among the fish species. The fat content was significantly higher in P. hypophthalmus and M. vittatus. The moisture was significantly higher in C. striata. The potassium content was significantly (p<0.01) higher in C.striata. M.vittatus shows higher content of calcium. The other trace minerals like iron, copper and zinc contents of fish did not differ significantly among the species. The vitamin A content is maximum in O.bimaculatus whereas vitamin D content is higher in Mystus vittatus. The palmitic acid was significantly (p<0.01) higher in M. vittatus. The oleic acid was significantly (p<0.01) higher in C. striata and W. attu. The linoleic acid content was significantly (p<0.05) higher in P. hypophthalmus. One of the important PUFA i.e. DHA was significantly higher in O. bimaculatus and C.striata. The PUFA content was significantly (p<0.05) higher in O.bimaculatus and P.hypophthalmus. Among the amino acids, arginine, histidine, threonine and isoleucine were higher in P.hypophthalmus. C.striata and W. attu contain high amount of Tryptophan. Glutamic acid was high in O.bimaculatus and Aspartic acid was high in C. striata. The energy content was maximum in P. hypophthalmus. The nutrient profile of these fish species revealed that they were rich in all the essential nutrients required by human being. The information on nutrient profile of fish will give a guideline to dieticians, nutritionists, medical practitioners, researchers to advice consumers to take fish in their daily diet as a health food. SAARC J. Agri., 16(2): 25-41 (2018)
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41

Voss, Peter, Stine Kildegaard Poulsen, Sebastian Bjerregaard Simonsen, and Søren Gregersen. "Seismic hazard assessment of Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 13 (October 12, 2007): 57–60. http://dx.doi.org/10.34194/geusb.v13.4976.

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Earthquake activity in Greenland has been registered and mapped since 1907 (Larsen et al. 2006) and thus a long (albeit relatively sparse) record of seismic activity is available for evaluation of seismic hazard and risk. Seismic hazard assessment is carried out by judging the probability of future earthquakes in a given region and is based on statistic treatment of earthquake data. The determination of the seismic hazard is the first step in an evaluation of seismic risk, i.e. the possible economic costs and loss of human life after an earthquake. The motivation for this seismic hazard study is the registration of four significant earthquakes in Greenland in 2005. The Geological Survey of Denmark and Greenland (GEUS) received reports of all four earthquakes from residents who had felt the shaking. The 2005 earthquakes were located at or near Qeqertarsuaq on 30 March, Sisimiut on 23 July, Station Nord on 30 August and Attu on 23 October (Fig. 1), with magnitudes on the Richter scale of 4.3, 4.1, 5.1 and 2.5, respectively. The earthquake in Attu led to the inhabitants fleeing in their boats.
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42

He, Junjie, Yinan Lin, Fangzhe Shi, Jiajun Fu, and Boning Chen. "Sentinel-2 Research on the Detection and Classification Methods of Maritime Ship Targets from Remote Sensing Images." Journal of Physics: Conference Series 2425, no. 1 (February 1, 2023): 012014. http://dx.doi.org/10.1088/1742-6596/2425/1/012014.

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Abstract There are problems such as low recognition accuracy and large classification error in the existing classification methods for ship identification based on optical remote sensing images. In this paper, we will analyze the characteristics of ships and determine the indicative factors for applying remote sensing to monitor ships in combination with optical remote sensing images. Using optical remote sensing image data, combined with U-Net and AttU-Net deep neural network models, we assist in extracting new remote sensing indices with strong generality and clear physical meaning, and establishing rules for monitoring ships, so as to establish a more general and clear physical meaning of the monitoring and identification method of remote sensing satellite images. The method is applied and evaluated with port optical remote sensing image data. The data show that compared with traditional machine learning methods, the accuracy of ship monitoring using U-Net and AttU-Net deep learning models in this paper reaches 89.04%, and the recall rate and accuracy rate are better than SVM. it shows that the model can detect ships effectively.
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Vankara, Anu Prasanna. "Prevalence and Spatial Distribution of Ectoparasites in Wallago attu of River Penna, YSR District, Andhra Pradesh, India." Applied Biological Research 24, no. 3 (2022): 367–75. http://dx.doi.org/10.5958/0974-4517.2022.00047.7.

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44

Giri, S. S., S. K. Sahoo, B. B. Sahu, A. K. Sahu, S. N. Mohanty, P. K. Mukhopadhyay, and S. Ayyappan. "Larval survival and growth in Wallago attu (Bloch and Schneider): effects of light, photoperiod and feeding regimes." Aquaculture 213, no. 1-4 (October 2002): 151–61. http://dx.doi.org/10.1016/s0044-8486(02)00012-1.

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45

Fan, Hsiu-Fang, Bo-Yu Su, Chien-Hui Ma, Paul A. Rowley, and Makkuni Jayaram. "A bipartite thermodynamic-kinetic contribution by an activating mutation to RDF-independent excision by a phage serine integrase." Nucleic Acids Research 48, no. 12 (June 1, 2020): 6413–30. http://dx.doi.org/10.1093/nar/gkaa401.

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Abstract Streptomyces phage ϕC31 integrase (Int)—a large serine site-specific recombinase—is autonomous for phage integration (attP x attB recombination) but is dependent on the phage coded gp3, a recombination directionality factor (RDF), for prophage excision (attL x attR recombination). A previously described activating mutation, E449K, induces Int to perform attL x attR recombination in the absence of gp3, albeit with lower efficiency. E449K has no adverse effect on the competence of Int for attP x attB recombination. Int(E449K) resembles Int in gp3 mediated stimulation of attL x attR recombination and inhibition of attP x attB recombination. Using single-molecule analyses, we examined the mechanism by which E449K activates Int for gp3-independent attL x attR recombination. The contribution of E449K is both thermodynamic and kinetic. First, the mutation modulates the relative abundance of Int bound attL-attR site complexes, favoring pre-synaptic (PS) complexes over non-productively bound complexes. Roughly half of the synaptic complexes formed from Int(E449K) pre-synaptic complexes are recombination competent. By contrast, Int yields only inactive synapses. Second, E449K accelerates the dissociation of non-productively bound complexes and inactive synaptic complexes formed by Int. The extra opportunities afforded to Int(E499K) in reattempting synapse formation enhances the probability of success at fruitful synapsis.
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Robbins, Michael. "The language of schizophrenia and the world of delusion." International Journal of Psychoanalysis 83, no. 2 (April 2002): 383–405. http://dx.doi.org/10.1516/attu-2m15-hx4f-5r2v.

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47

Sultana, S., F. Jabeen, T. Sultana, K. A. AL-Ghanim, F. Al-Misned, and S. Mahboob. "Assessment of heavy metals and its impact on DNA fragmentation in different fish species." Brazilian Journal of Biology 80, no. 4 (December 2020): 823–28. http://dx.doi.org/10.1590/1519-6984.221849.

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Abstract This study was conducted to assess water pollution by examining DNA fragmentation in selected fish organs (kidney, liver, gills, and muscle tissue) from Wallago attu, Sperata sarwari, Vulgaris vulgaris, and Labeo rohita collected from a known polluted section of the Chenab River, Pakistan, and from a control site. The fish were caught using a gill net and were assigned to three different weight groups (W1, W2, and W3) to study the degree of variation in DNA fragmentation in relation to body weight. In fish from the polluted site, DNA fragmentation was higher in kidney, liver, gills, and muscles, compared to the control. No significant DNA fragmentation was observed in fish collected from the control site. Highly significant (P < 0.01) relationship between body weight and DNA fragmentation was found in the organs of fish procured at the contaminated site. DNA fragmentation in body organs was found to be affected by the concentrations of lead, copper, nickel, and cadmium in W. attu, S. sarwari, L. rohita, and V. vulgarus harvested from Chenab River. DNA fragmentation in different freshwater fish species is therefore a reliable biomarker of water pollution.
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48

Pruett, Christin L., Angela Ricono, Cory Spern, and Kevin Winker. "Island life and isolation: The population genetics of Pacific Wrens on the North Pacific Rim." Condor 119, no. 1 (February 1, 2017): 131–42. http://dx.doi.org/10.1650/condor-16-183.1.

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Abstract Conservation of intraspecific variation is a growing focus of conservation biology. Island populations can make up a large portion of the variation of widespread species, as they are often isolated and exhibit differences in phenotype and genetic structure compared with mainland populations. We genotyped 169 Pacific Wrens (Troglodytes pacificus) from 9 locations and 6 subspecies in Alaska, USA, and British Columbia, Canada, to examine the population structure, genetic diversity, and likelihood of genetic rescue of island populations of conservation concern. We found that 25% of genetic variation was partitioned among conservation units delineated by subspecies, suggesting that the present framework of managing subspecies as separate units is warranted. Populations found farthest from possible mainland sources had the lowest genetic diversity. The Attu Island population, subspecies T. p. meligerus, had the lowest genetic diversity and highest genetic divergence of all sampled locations, a signal also found in Attu Island populations of Song Sparrow (Melospiza melodia) and Rock Ptarmigan (Lagopus muta). Currently, populations in western Alaska are unlikely to be connected to populations in mainland locations through dispersal, and thus are unlikely candidates for natural genetic or demographic rescue.
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Surya Prakash Mishra. "A New Monogenean-ectoparasites Silurodescoides srivastavai n.sp. From Edible Fresh-water Cat Fish Wallago attu of District Balrampur, Uttar Pradesh, India." January 2021 7, no. 01 (January 4, 2021): 65–68. http://dx.doi.org/10.46501/ijmtst070114.

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The fresh-water fish Wallago attu (Bloch. And Schn.) was collected from local fish market of district Balrampur (U.P.) and examined 15 specimens, of which only one specimen was found infected with 17 specimens of said species. The site of infection being the gill filaments of the host. The present form differs from S. devraji, S. malabaricus and S.parvulus in having accessory pieces on dorsal anchors and presence of wings on dorsal anchors. Moreover, it differs from S. indicus, S octolytus, S. aori and S. sudhakari in having cephalic glands and different shape of copulatory complex and vagina. On subsequent study, the present form appear to be a new species of the genus Silurodescoides Gussev, 1974 and described as a new species and named Silurodescoides srivastavai n. sp. in the honor of Dr. C.B. Srivastava, Ex. Dy. Director, Zoological Survey of India, Kolkata.
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50

Wan, Da, Runqi Zhao, Sheng Zhang, Hui Liu, Lian Guo, Pengbo Li, and Lei Ding. "A Deep Learning-Based Approach to Generating Comprehensive Building Façades for Low-Rise Housing." Sustainability 15, no. 3 (January 18, 2023): 1816. http://dx.doi.org/10.3390/su15031816.

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In recent years, as machine learning has been widely studied in the field of architecture, scholars have demonstrated that computers can be used to learn the graphical features of building façade generation. However, existing deep learning in façade generation has yet to generate only a single façade, without comprehensive generation of five façades including the roof. Moreover, most of the existing literature has utilized the Pix2Pix algorithm for façade generation experiments, failing to attempt to replace the original generator in Pix2Pix with a different generator for experiments. This study addresses the above issues by collecting and filtering entries from the international Solar Decathlon (SD competition) to obtain a data set. Subsequently, a low-rise residential building façade generation model based on the Pix2Pix neural network was constructed for training and testing. At the same time, the original U-net generator in Pix2Pix was replaced with three different generators, U-net++, HRNet and AttU-net, for training and test results were obtained. The results were evaluated from both subjective and objective aspects and it was found that the AttU-net generative network showed the best comprehensive generation performance for such façades. HRNet is acceptable if there is a need for fast training and generation
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