MACROALGAS MARINAS DE LA BAHÍA DE SAN QUINTÍN, BAJA CALIFORNIA, MÉXICO

In order to know the composition anddistribution of macroalgae species in thelagoon complex of San Quintin Bay, BajaCalifornia, nine sampled were realized inthree sites during 1988, 1989, 1990, 1995 and1996; also a bibliographyc revision on themarine benthic algae cited from the studyarea. A total of 37 genera with 46 species ofmarine macroalgae were determined, ofwhich 22 are Rhodophyta, (47.82 %), 12Phaeophyta (26.08 %) and 12 Chlorophyta(26.08 %). The floristic list includes data onthe presence and distribution of speciesfound, reproductive stage, substrate and epiphytism. The families with bestrepresentation with regard to richnessand occurrence are: Corallinaceae,Ceramiaceae, Rhodomelaceae (Rhodophyta); Ectocarpaceae, Scytosiphonaceae(Phaeophyta) and Ulvaceae (Chlorophyta).18 (39.13 %) represent new records from thestudy area. Ulva expansa Linnaeus isreported for the first time for the occidentalcoast of Baja California. The floristc list andthe bibliographyc information wereactualized; the dates show that the numberod species of marine algae from San QuintinBay is composed for 59 species.Con la finalidad de determinar la distribucióny composición de las especies demacroalgas presentes en el complejolagunar de la bahía de San Quintín, BajaCalifornia, se realizaron nueve muestreos entres sitios, durante 1988, 1989, 1990, 1995 y1996; así como una revisión bibliográficade algas marinas citadas para el área deestudio. Los resultados obtenidos delmaterial recolectado indican la presencia de37 géneros con 46 especies, de las cuales22 son Rhodophyta (47.82 %), 12Phaeophyta (26.08 %) y 12 Chlorophyta(26.08 %). En la lista florística se incluyendatos sobre la presencia y distribuciónde las especies en el área de estudio,su estado reproductivo, sustrato yepifitismo. En términos de diversidadde especies, las familias mejorrepresentadas corresponden a Corallinaceae, Ceramiaceae, Rhodomelaceae(Rhodophyta), Ectocarpaceae, Scytosiphonaceae (Phaeophyta) y Ulvaceae(Chlorophyta). Del total de algasidentificadas, 18 (39.13 %) representannuevos registros para el área de estudio. Se cita por primera vez a Ulva expandaLinnaeus para la costa occidental de BajaCalifornia. Al depurar y actualizar lainformación bibliográfica desde el punto devista florístico y nomenclatural, se encontróque la flora marina conocida hasta hoy parala bahía de San Quintín es de 59 especies

Exactly Solvable Hydrogen-like Potentials and Factorization Method

A set of factorization energies is introduced, giving rise to a generalization of the Schr\"{o}dinger (or Infeld and Hull) factorization for the radial hydrogen-like Hamiltonian. An algebraic intertwining technique involving such factorization energies leads to derive $n$-parametric families of potentials in general almost-isospectral to the hydrogen-like radial Hamiltonians. The construction of SUSY partner Hamiltonians with ground state energies greater than the corresponding ground state energy of the initial Hamiltonian is also explicitly performed.Comment: LaTex file, 21 pages, 2 PostScript figures and some references added. To be published in J. Phys. A: Math. Gen. (1998

Reprodutibilidade de marcadores RAPD em germoplasma de tucumã-do-pará.

Marcadores RAPD apresentam simplicidade, rapidez de resultados, baixo custo quando comprados a outros marcadores, demandam pequenas quantidades de DNA, sendo úteis em análises genéticas de espécies pouco conhecidas, como é o caso do tucumã-do-pará (Astrocaryum vulgare Mart.). Apesar de úteis a esse grupo de espécie são relatados como tendo pouca reprodutividade. Objetivou-se avaliar a reprodutibilidade de marcadores RAPD em germoplasma de tucumã-do-pará. Foram utilizadas cinco amostras de DNA de tucumã-do-pará, conservadas sob baixa temperatura no laboratório de genética molecular da Embrapa Amazônia Oriental, em testes de amplificação com cinco iniciadores RAPD da Operon Technologies, em três termocicladores com diferentes taxas de rampa. As reações foram preparadas para um volume final de 15 µl, para cada termociclador foram repetidas as mesmas reações. Os produtos amplificados foram aplicados em gel de agarose a 1% e separados por eletroforese horizontal. Compararam-se os perfis de géis e suas bandas amplificadas coincidentes para cada primer em cada equipamento para o cálculo da taxa de reprodutividade. O termociclador 3 apresentou a melhor nitidez e intensidade das bandas, o qual possui taxa de rampa de 5°C/s. A taxa de reprodutibilidade média foi de 47%. Os primers OPAB-01, OPAZ-04 e OPA-14 demonstraram as maiores reprodutibilidade com 57%, 55% e 52,14%, respectivamente. Os marcadores RAPD se mostram mais reproduzíveis em tucumã-do-pará utilizando equipamento com taxa de rampa de temperatura de 5°C/s

Calculation of Band Edge Eigenfunctions and Eigenvalues of Periodic Potentials through the Quantum Hamilton - Jacobi Formalism

We obtain the band edge eigenfunctions and the eigenvalues of solvable periodic potentials using the quantum Hamilton - Jacobi formalism. The potentials studied here are the Lam{\'e} and the associated Lam{\'e} which belong to the class of elliptic potentials. The formalism requires an assumption about the singularity structure of the quantum momentum function $p$, which satisfies the Riccati type quantum Hamilton - Jacobi equation, $p^{2} -i \hbar \frac{d}{dx}p = 2m(E- V(x))$ in the complex $x$ plane. Essential use is made of suitable conformal transformations, which leads to the eigenvalues and the eigenfunctions corresponding to the band edges in a simple and straightforward manner. Our study reveals interesting features about the singularity structure of $p$, responsible in yielding the band edge eigenfunctions and eigenvalues.Comment: 21 pages, 5 table

Laminosioptes cysticola and Gallibacterium anatis infections in a lymphoma diseased chicken hen with a cystic right oviduct

A domestic hen showing infraorbital swelling was presented for a routine classroom demonstration of avian diagnostics. At necropsy, tiny whitish caseo-calcareous nodules were found in the subcutaneous tissues of the carcass, produced by the subcutaneous fowl mite, Laminosioptes cysticola. Gallibacterium anatis biovar haemolytica was isolated from the infraorbital sinus, it containing a caseous exudate. During necropsy, a conspicuous cyst was found in the abdominal cavity. Microscopic examination of the internal lining of the cyst revealed a single cuboidal to columnar, ciliated epithelium, leading to a diagnosis of oviductal cyst. Also, the microscopic examination of the heart, lung, liver and kidney reveal a multifocal infiltration of lymphoma cells. It appears the first case of simultaneous presentation of these conditions from a single chicken

Distorted Heisenberg Algebra and Coherent States for Isospectral Oscillator Hamiltonians

The dynamical algebra associated to a family of isospectral oscillator Hamiltonians is studied through the analysis of its representation in the basis of energy eigenstates. It is shown that this representation becomes similar to that of the standard Heisenberg algebra, and it is dependent of a parameter $w\geq 0$. We name it {\it distorted Heisenberg algebra}, where $w$ is the distortion parameter. The corresponding coherent states for an arbitrary $w$ are derived, and some particular examples are discussed in full detail. A prescription to produce the squeezing, by adequately selecting the initial state of the system, is given.Comment: 21 pages, Latex, 3 figures available as hard copies upon request from the first Autho

Role of nucleus accumbens μ opioid receptors in the effects of morphine on ERK1/2 phosphorylation

Rationale: Despite the critical role attributed to phosphorylated extracellular signal regulated kinase (pERK1/2) in the nucleus accumbens (Acb) in the actions of addictive drugs, the effects of morphine on ERK1/2 phosphorylation in this area are still controversial. Objectives: In order to investigate further this issue, we studied (1) the ability of morphine to affect ERK1/2 phosphorylation in the shell (AcbSh) and core (AcbC) of Sprague-Dawley and Wistar rats and of CD-1 and C57BL/6J mice and (2) the role of dopamine D1 and μ-opioid receptors in Sprague-Dawley rats and CD-1 mice. Methods: The pERK1/2 expression was assessed by immunohistochemistry. Results: In rats, morphine decreased AcbSh and AcbC pERK1/2 expression, whereas in mice, increased it preferentially in the AcbSh compared with the AcbC. Systemic SCH 39166 decreased pERK1/2 expression on its own in the AcbSh and AcbC of Sprague-Dawley rats and CD-1 mice; furthermore, in rats, SCH 39166 disclosed the ability of morphine to stimulate pERK1/2 expression. Systemic (rats and mice) and intra-Acb (rats) naltrexone prevented both decreases, in rats, and increases, in mice. Conclusions: These findings confirm the differential effects of morphine in rats and mice Acb and that D1 receptors exert a facilitatory role on ERK1/2 phosphorylation; furthermore, they indicate that, in rats, removal of the D1-dependent pERK1/2 expression discloses the stimulatory influence of morphine on ERK1/2 phosphorylation and that the morphine’s ability to decrease pERK1/2 expression is mediated by Acb μ-opioid receptors. Future experiments may disentangle the psychopharmacological significance of the effects of morphine on pERK1/2 in the Acb

Pigmentation and production of vitamins in mango (Mangifera indica L.)

Mango (Mangifera indica L.) is the fifth most cultivated vegetable in the world. One way to classify the mango is according to the color of the peel, they are classified as green, yellow and red. Color is a visual attribute that defines consumer preference in some countries. This diversity of pigmentation is defined by families of genes that code for the production of proteins, which lead to biosynthetic pathways responsible for the production of vitamins and their precursors. In Mexico there is a wide range of colors in the native mango germplasm, which could represent an important source of antioxidants, pigments and would bring benefits for the human health of Mexicans, through the consumption of fresh fruit, or commercial / industrial exploitation of these. According to the literature, this diversity of colors represents a genetic wealth that could be exploited in the genetic improvement programs of the species in the country, to generate new varieties with desirable characteristics in the national and international market. In order to gather and discuss information that contributes to understanding the biochemical and genetic processes that determine said pigmentation and the production of vitamins in mango, this review makes a description of the main genes involved and the biosynthetic pathways of the most common pigments, considering the impact on human health when consuming them, and highlighting the challenges and opportunities that could arise from the use of pigments from Mexican germplasm.Mango (Mangifera indica L.) is the fifth most cultivated plant in the world. One way to classify mango is according to the color of the skin; mangoes are classified as green,  yellow and red. Color is a visual attribute that defines consumer preference in some countries. This pigmentation diversity is defined by families of genes that encode for protein production, which lead to biosynthetic pathways responsible for the production of vitamins and vitamin precursors. In Mexico there is a wide range of colors in the native mango germplasm, which could represent an important source of antioxidants, pigments and would bring benefits to the human health of Mexicans, through the consumption of the fresh fruits, or the commercial/industrial exploitationof these. According to the literature, this diversity of colors represents a genetic richness that could be exploited in the genetic breeding programs of the species in the country, to generate new varieties with desirable characteristics in the national and international market. In order to gather and discuss information that contributes to the understanding of the biochemical and genetic processes that determine such pigmentation and the production of vitamins in mango, this review describes the main genes involved and the biosynthetic pathways of the most common pigments, considering the impact on human health when they are consumed, and highlighting the challenges and opportunities that could be derived from the utilization of pigmentsfrom the Mexican germplasm