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A LIGHT AIRCRAFT AS A LOW-FREQUENCY SOUND SOURCE FOR ACOUSTICAL OCEANOGRAPHY Gayana
Buckingham,Michael J; Giddens,Eric M.
The sound from a propeller-driven aircraft is largely generated by the propeller itself. Its acoustic signature consists of a series of harmonics, the lowest of which, the fundamental, is typically in the region of 100 Hz, with the higher harmonics appearing at multiples of the fundamental. Experiments have recently been conducted off the coast of southern California, using several different types of single-engine, light aircraft, which show that the first 10 or so propeller harmonics are detectable not in the atmosphere, in the water column and also on sensors buried to a depth of about 1 m in the seabed. The Doppler-shifted comb of frequencies produced by an aircraft propeller is the basis of a recently developed technique for making point measurements...
Tipo: Journal article
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200013
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A light- and electron microscopic study of primordial germ cells in the zebra fish (Danio rerio) Biol. Res.
Deniz Koç,Nazan; Yüce,Rikap.
In sexually reproducing organisms, primordial germ cells (PGCs) give rise to the cells of the germ line, the gametes. In many animals, PGCs are set apart from somatic cells early during embryogenesis. This study explores the origin of primordial germ cells (PGCs) of the zebra fish and examines their morphology during early development (1st day-15th day). PGCs were selectively stained by the alkaline phosphatase histochemical reaction and viewed by light and electron microscopy from the time they are first detectable in the yolk sac endoderm. PGCs occurred in the subendodermal space on the syncytial periblast; differing from the surrounding endodermal cells. Later the PGCs moved to between the blastoderm and yolk sac and transferred to the dorsal mesentery...
Tipo: Journal article Palavras-chave: Primordial germ cell; Zebra fish; Ultrastructure; Morphology.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400001
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A Limit for Antler Length in Captive Marals International Journal of Morphology
Korzhikenova,N; Sambetbaev,A; Iglikov,O; Parés-Casanova,P. M.
The main aim of this study was to estimate phenotypic correlations among live weight, withers height, rump height, chest depth, chest width, thoracic girth, body length, hip widths (between iliac tuberosities and between ischial tuberosities) and forelimb cannon perimeter with antler length measured during the growth of marals on a Kazakh farm. The data comprised 18 animals studied during their growth (at 18 months and at 24 months). In maral, the first period of antler productivity takes place at the age of 24 months. This fact should be taken into account in order to select the best animals for antler production, which is the main purpose for farming this species.
Tipo: Journal article Palavras-chave: Phenotypic correlation; Maral; Morphological traits.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200031
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A los 150 años desde "El origen de las especies": ¿es darwinista la biología contemporánea? RChHN
FOLGUERA,GUILLERMO; BOZINOVIC,FRANCISCO.
A los 150 años de la publicación de "El origen de las especies" de Charles Darwin, numerosos homenajes se han realizado en diferentes ciudades del mundo. Sin embargo, es importante preguntarse hacia el seno de la comunidad científica acerca del alcance efectivo del darwinisimo dentro de la biología. En este trabajo analizamos este supuesto intentando responder, al menos de una manera aproximativa, la pregunta: ¿es darwinista la biología en la actualidad? A estos fines, consideramos algunos de los principales aportes que suelen asignarse al darwinismo en las ciencias de los sistemas vivos: el análisis y centro en la diversidad, un origen único de los sistemas vivos, la incorporación del azar y el reconocimiento de las causas proximales. En términos...
Tipo: Journal article Palavras-chave: Causas próximas; Darwinismo; Diversidad biológica.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400003
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A low-protein diet during pregnancy prevents modifications in intercellular communication proteins in rat islets Biol. Res.
Marçal-Pessoa,Ana Flávia; Bassi-Branco,Carmen Lucia; Salvatierra,Cristiana dos Santos Barbosa; Stoppiglia,Luiz Fabrizio; Ignacio-Souza,Letícia Martins; Reis,Sílvia Regina de Lima; Veloso,Roberto Vilela; Reis,Marise Auxiliadora de Barros; Carneiro,Everardo Magalhães; Boschero,Antonio Carlos; Arantes,Vanessa Cristina; Latorraca,Márcia Queiroz.
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Tipo: Journal article Palavras-chave: Connexin 36 Connexin 43 β -catenin Low protein diet Pregnancy Pancreatic islets Rat.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100003
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A Lux-like Quorum Sensing System in the Extreme Acidophile Acidithiobacillus ferrooxidans Biol. Res.
RIVAS,MARIELLA; SEEGER,MICHAEL; HOLMES,DAVID S; JEDLICKI,EUGENIA.
The genome of the acidophilic, proteobacterium Acidithiobacillus ferrooxidans, contains linked but divergently oriented genes, termed afeI and afeR, whose predicted protein products are significantly similar to the LuxI and LuxR families of proteins. A possible promoter and Lux box are predicted upstream of afeI. A cloned copy of afeI, expressed in E. coli, encodes an enzyme that catalyzes the production of a diffusible compound identified by gas chromatography and mass spectrometry as an unsubstituted N-acyl homoserine lactone (AHL) of chain length C14. This AHL can be detected by a reporter strain of Sinorhizobium meliloti Rm41 suggesting that it is biologically active. The reporter strain also responds to extracts of the supernatant of A. ferrooxidans...
Tipo: Journal article Palavras-chave: A. ferrooxidans; Quorum-sensing; LuxI and LuxR; Lux box; Homoserine lactone.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200018
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A Macroanatomical and Histological Study of the Uropygial Gland in the White Stork (Ciconia cicionia) International Journal of Morphology
Kozlu,Tolunay; Bozkurt,Yesim Akaydin; Ates,Sevinc.
The present study was aimed at the macroanatomical and histological investigation and the demonstration of the structural characteristics of the uropygial gland in the white stork. The uropygial gland of two adult male white storks constituted the material of the study. It was determined that the gland was situated subcutaneously in between the caudal aspect of the lumbosacral bone and the first coccygeal vertebrae. The gland was composed of two lobes, which displayed an oval appearance when viewed from above and resembled a water drop when observed medially. Tuft of feathers were present on the caudal margin of each lobe. The present study revealed that the uropygial gland of the white stork is a simple tubular gland, which discharges its secretion into...
Tipo: Journal article Palavras-chave: White stork; Uropygial gland; Anatomy; Histology.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300010
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A Manuscript Writing Course for Biochemistry Undergraduates and Graduate Students in the Biomedical Sciences Electron. J. Biotechnol.
Glew,Robert H..
Tipo: Journal article
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100001
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A mathematic model for the interaction between Meloidogyne spp. and Pasteuria penetrans Rev. Protección Veg.
Miranda,Ileana; Gómez,Lucila; Benítez,Hugo L.; Castillo,Yoannia; Hernández-Ochandía,Dainé; Rodríguez,Mayra G..
Some aspects of Meloidogyne spp. (root-knot nematode) growth regulation by the gram-negative bacterium Pasteuria penetrans were reviewed. The study allowed the construction of a mathematical model to predict the dynamics of both organisms. The model includes 11 differential equations and 31biological constants describing the life-cycle of the nematode and its relationship with the bacterium. To simulate the real behavior of the populations, the constants, which represent biological parameters, have to be evaluated under controlled conditions similar to those of soil microcosm.
Tipo: Journal article Palavras-chave: Bio-mathematics; Meloidogyne; Pasteuria penetrans; Biological control; Biomatemática; Meloidogyne; Pasteuria penetrans; Control biológico.
Ano: 2014 URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1010-27522014000200011
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A microbial community analysis of the octocoral Eunicea fusca Electron. J. Biotechnol.
Duque-Alarcón,Angela; Santiago-Vázquez,Lory Z; Kerr,Russell G.
While there is a significant and growing body of knowledge describing the microbial communities of marine invertebrates such as sponges, there are very few such studies focused on octocorals. The octocoral Eunicea fusca is common on reefs in various regions of the Caribbean and has been the subject of natural product investigations. As part of an effort to describe the microbial community associated with octocorals, a culture-independent analysis of the bacterial community of E. fusca was conducted. Specifically, a 16S rDNA clone library analysis was performed to provide baseline data. A total of 40 bacteria members from 11 groups were found. In general, Proteobacteria were the dominant group with a total of 24 species and α-Proteobacteria...
Tipo: Journal article Palavras-chave: 16S rDNA; Bacteria; Culture-independent analysis; Eunicea fusca; Microbial community; Octocoral.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500015
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A micromethod for high throughput RNA extraction in forest trees Biol. Res.
LE PROVOST,GREGOIRE; HERRERA,RAÚL; PAIVA,JORGE AP; CHAUMEIL,PHILIPPE; SALIN,FRANCK; PLOMION,CHRISTOPHE.
A large quantity of high quality RNA is often required in the analysis of gene expression. However, RNA extraction from samples taken from woody plants is generally complex, and represents the main limitation to study gene expression, particularly in refractory species like conifers. Standard RNA extraction protocols are available but they are highly time consuming, and not adapted to large scale extraction. Here we present a high-throughput RNA extraction protocol. This protocol was adapted to a micro-scale by modifying the classical cetyltrimethylammonium (CTAB) protocol developed for pine: (i) quantity of material used (100-200 mg of sample), (ii) disruption of samples in microtube using a mechanical tissue disrupter, and (iii) the use of SSTE buffer....
Tipo: Journal article Palavras-chave: RNA extraction; Micromethod; Forest trees.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400003
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A Model for the Estimation of Personal Stature from the Length of Forearm International Journal of Morphology
Ilayperuma,Isurani; Nanayakkara,Ganananda; Palahepitiya,Nadeeka.
Prediction of stature from incomplete and decomposing skeletal remains is vital in establishing the identity of an unknown individual. It has been stated that a variety of factors such as race, gender and nutrition play an important role in determining the height of an individual. Estimation of stature from measurements of various long bones has been achieved with varying degree of accuracy. Those studies resulted in establishing different formulae for the estimation of stature for the respective populations. However, evidence shows that there is a great void in such norms for Sri Lankans. Hence, this study was designed to investigate the relationship and to propose a gender and age specific linear regression models between the ulna length and height of an...
Tipo: Journal article Palavras-chave: Height; Ulna; Sri Lankan; Regression equation.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400015
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A molecular marker approach using intron flanking EST-PCR to map candidate genes in peach (Prunus persica) Electron. J. Biotechnol.
Diez-de-Medina,Sergio; Silva,Herman.
In Peach (Prunus persica) several physiological changes, such as woolliness, triggered by chilling injury are involved in major production losses due to cold storage of the fruits during shipping. Additionally, the low level of polymorphisms among peach varieties is an important limitation in the search for new molecular markers that could be associated with economically important traits. Therefore, a functional approach was employed to associate candidate genes with an informative marker in peach. The data was obtained from the results of an in silico analysis of four different cold peach treatments. Thirty two candidate genes were selected that were aligned against Arabidopsis thaliana genomic sequences to design intron-flanking EST-PCR markers. These...
Tipo: Journal article Palavras-chave: Bin mapping; Molecular markers; Prunus; Rosaceae.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500007
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A Morphological and Biometric Study of the Infraorbital Foramen (E2 - Sibai Point) in Adult Skulls International Journal of Morphology
Oliveira Junior,E. M. de; Moreira,R. T; Neto,B. L; Silva,C. M. F. da; Lima,F. J. C.
The objective of this work was to study the morphology and biometry of the infraorbital foramen (FIO), variations in its shape, size and number as well as to obtain measurements of its location. 60 dry skulls were analyzed. The test of Qui-quadrant and the T Test were used in measurements with a 5% significance. On the right side, the FIO was measured at a distance of 6.49(±1.68) mm from the lower, 39.65(±3) mm from the upper, 17.7(±2.97) mm from the medial and 20.46(±2.9) mm from the lateral margin of the orbit; its pear-shaped opening distance was 13.67(±2.17) mm. On the left side, the distance of the FIO to the lower margin of the orbit was 6.52(±1.82) mm; to the upper margin was 39.9(±2.62) mm and to the lateral and medial margin were 17.93(±2.58) mm...
Tipo: Journal article Palavras-chave: Infraorbital foramen (E2-Sibai Point); Acupuncture; Biometry.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300036
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A Morphological Study of the Dorsum Sellae in Human Skull International Journal of Morphology
Haider,Syed Javed; Rezigalla,Assad Ali; Abdalla,Asim Mohammed.
Anatomical variations in the shape and dimension of the dorsum sellae and posterior clinoid process are common. Most textbooks describe its shape as a median rectangular plate, a square plate, or a transverse ledge on a slope behind the sella turcica (hypophyseal fossa). This work aims to study the dorsum sellae of human skull. One hundred and twenty five dried adult human skulls, irrespective of age, were used for the study. Detailed features of the dorsum sellae were noted and classified into five types: crest like, thin plate, frail quadrilateral plate, heavy square plate, thick elongated plate. Fusion of the posterior and middle clinoid processes in one (unilateral) and all the clinoid processes (anterior, middle, and posterior) in three skulls...
Tipo: Journal article Palavras-chave: Dorsum sellae; Clinoid process; Anatomical variations; Skull.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400001
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A Morphological Study of the Suprascapular Notch in a Sample of Scapulae at the University of Kwazulu Natal International Journal of Morphology
Manikum,C; Rennie,C; Naidu,E. C. S; Azu,O. O.
The suprascapular notch (SSN) is important, as it is a risk factor in the development of suprascapular nerve entrapment syndrome. The purpose of this study is to describe the morphology of the SSN of a sample of normal scapulae in the Discipline of Clinical Anatomy, University of KwaZulu Natal. Sixty scapulae were used consisting of 37 males and 23 females (mean age 51 years). The superior transverse diameter and maximal depth of the notches were measured. Comparisons were made of the notch in relation to the maximal width and length of the scapulae, laterality and sex. The Rengachary classification method was adopted to describe the shape of the SSN. Analysis of morphological variations showed Type II- wide blunted V-shaped notch to be predominant (65%)....
Tipo: Journal article Palavras-chave: Suprascapular notch; Morphology; Clinical anatomy; Nerve entrapment.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400029
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A Morphometric Study of the Extraocular Muscles International Journal of Morphology
Villarreal-Silva,Eliud Enrique; Hinojosa Amaya,José Miguel; Bazaldua Cruz,Juan José; Martínez Fernández,David; Elizondo-Omaña,Rodrigo Enrique; Guzmán López,Santos.
Extraocular muscles are important references in strabismus surgery and in placement of intraorbital devices. We analyzed extraocular muscles morphometry and possible anatomical variances of 20 orbits. We report the length, width, and points of insertion of the extraocular muscles. No anatomical variations in length, width and points of insertion were found. With regard to the rectus muscles, it was found that the superior rectus and lateral rectus are the longest muscles and that the width difference between the superior and inferior rectus is greater than that between the medial and lateral rectus and that the point of insertion of the rectus muscles has a variable morphology. The superior oblique muscle was smaller in caliber than the inferior oblique,...
Tipo: Journal article Palavras-chave: Extraocular muscles; Morphometry; Orbits.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100049
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A Morphometric Study on the Skull of Donkey (Equus asinus) International Journal of Morphology
Zhu,Lei; Shi,XiaoDong; Wang,JunJie; Chen,JianGang.
The present study was carried out on a number of 16 skulls of adult male domestic donkeys. Craniometric measurements for 40 different parts of the skulls were made. All investigated features were expressed as Mean±SD. Cephalic indices and ratios were calculated by using the investigated features. The craniometric measurements and cephalic indices had been compared with those of local horses and ponies. A skull length of 443.07±53.57 mm and a maximum zygomatic width of 169.09±17.64 mm were obtained. The size of donkey skull was between those of local horses and ponies. A skull index of 38.23±0.85, a cranial index of 45.01±2.83 and a facial index of 67.80±3.79 were obtained. Cranial index and skull index were found to be close in value to that of local...
Tipo: Journal article Palavras-chave: Skull; Donkey; Craniometry.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400030
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A most effective method for selecting a broad range of short and medium-chain-length polyhidroxyalcanoate producing microorganisms Electron. J. Biotechnol.
Revelo Romo,Dolly Margot; Grosso,María Victoria; Moreno Solano,Nubia Carmenza; Montoya Castaño,Dolly.
A molecular approach was used for selecting polyhydroxyalcanoate (PHA)-accumulating potential Gram-negative bacteria from different genera by colony polymerase chain reaction (PCR). Three degenerate primers were designed for amplifying a fragment from PHA synthase gene (phaC) (Class I), phaC1 and phaC2 (Class II) genes for detecting PHA-producing bacteria. Thirty-four out of 55 bacterial strains from the old collection selected using Sudan black B staining were phaC+. PCR was used for directly selecting 35 new collection bacterial strains; these strains were phaC+ and their ability to produce PHA was confirmed by Sudan black B staining. Four specific primers were designed on genes of Class II PHA biosynthesis operon. These primers were used for evaluating...
Tipo: Journal article Palavras-chave: 16S rDNA; Colony PCR; Degenerate primers; PHA synthase; Polyhydroxyalcanoate; Seminested PCR.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300002
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A MULTIVARIATE ANALYSIS OF Boophilus microplus (ACARI: IXODIDAE): NON-PARASITIC PHASE Rev Salud Anim.
de la Vega,R; Díaz,G; da Fonseca,A.H.
Multivariate statistical methods are relatively new tools for data analysis. They have a lot of applications in biological researches: nevertheless, for several reasons, they have not been widely employed in this subject yet. Recently, present authors published a paper applying multivariate statistics on non-parasitic phase of Anocentor nitens. In the present article Boophilus microplus has received a very similar statistic treatment. In this paper, the influence of different incubation conditions was studied in groups of 12-15 individuals in each of the 24 combinations of six temperatures 24, 27, 30, 32, 34 and 36ºC and four relative humidity values, 100, 80, 75.5 and 70% over the cycle variables of B. microplus. According to the results, the best...
Tipo: Journal article Palavras-chave: Ticks; Ixodidae; Boophilus microplus; Multivariate Analysis; Non-parasitic phase.
Ano: 2010 URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S0253-570X2010000200004
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