Temperature-Controlled Stimulation of Hemopoiesis in a Hypophysectomized Cyprinodont Fish Fundulus heteroclitus

ntelligent temperature-controlled fiber can perceive changes in the environment and correspond accordingly subject to stimulation of certain conditions. In the functional innovation, the intelligent fibrous material modifies the nature of conventional synthetic fiber and the original performance of natural fiber and chemical fiber. Through in-depth analysis of the existing achievements, strive to explore the application prospect of intelligent temperature-controlled fiber starting from the internal structure of textile fibers.

Download Full-text

Toxicity and environmental requirements of a strain of Aphanizomenon flos-aquae (L.) Ralfs

Canadian Journal of Microbiology ◽

10.1139/m69-028 ◽

1969 ◽

Vol 15 (2) ◽

pp. 165-173 ◽

Cited By ~ 69

Author(s):

John H. Gentile ◽

Thomas E. Maloney

Keyword(s):

Fundulus Heteroclitus ◽

Maximum Growth ◽

Defined Medium ◽

Culture Temperature ◽

Ph Optimum ◽

Naturally Occurring ◽

Environmental Requirements ◽

Daphnia Catawba ◽

Phosphorus Levels ◽

Stimulation Of

A toxic strain of Aphanizomenon flos-aquae was isolated and cultured in a defined medium (ASM-1). This strain fixes nitrogen, has a pH optimum of 7.5, and has maximum growth rates at 5000 lux and 26 °C. Phosphorus levels of 1.0 μM readily supported populations of 1 × 105 cells/ml with stimulation of growth evident at a concentration of 0.1 μM P. Tris is inhibitory to growth of this alga at concentrations above 2.5 mM.Toxin production is related to age of culture, temperature, and light intensity but not nitrogen source.Intraperitoneal injection of toxic extracts into Fundulus heteroclitus, Cyprinodon variegatus, and white mice gave a LD100 of 0.5 mg/kg, 0.5 mg/kg, and 8 mg/kg, respectively. Assays with Notemigonus crysoleucas and Bosmina longirostris indicate that the toxin from naturally occurring bloom populations (1 × 106 cells/ml), if released all at once, would be capable of killing certain species of fish and microcrustaceans. Daphnia catawba, however, was much more resistant to toxin (LD100 = 1.0 mg/ml) while cyclopoid copepods, ostracods, and chydorid cladocerans were completely unaffected by toxin concentrations of 2.0 mg/ml. The possible ecological significance of this toxic alga in relation to fish kills is also discussed.

Download Full-text

Varying the Temperature Around the Scrotum of a Conscious Dog Between 15 °C and 31 °C does not Affect Respiration or Metabolism

Canadian Journal of Physiology and Pharmacology ◽

10.1139/y73-028 ◽

1973 ◽

Vol 51 (3) ◽

pp. 197-204 ◽

Cited By ~ 2

Author(s):

J. L. Plewes ◽

D. B. Jennings

Keyword(s):

Heart Rate ◽

Oxygen Consumption ◽

Respiratory Function ◽

Perfusion System ◽

Similar Time ◽

Conscious Dog ◽

Scrotal Temperature ◽

Series Of Experiments ◽

Temperature Controlled ◽

Stimulation Of

A jockstrap which contained a temperature-controlled water perfusion system was placed around the scrotum of a resting conscious dog. Two series of experiments (five studies each) were carried out. In one series scrotal perfusion temperature was lowered in steps at 30-min intervals at temperatures of 31, 27, 23, 19, and 15 °C. Another comparable series of experiments was carried out except that the scrotal perfusion temperature was increased in the same steps from 15 to 31 °C. In both experiments there was a fall in hypothalamic and rectal temperatures with time but this was not different from control studies over a similar time in which scrotal perfusion temperature was maintained constant. Warming the scrotal area resulted in an increase in scrotal temperature and cooling the scrotal area resulted in a decrease in scrotal temperature. Despite these changes in local perfusion and scrotal temperatures, there were no significant changes in respiration or oxygen consumption. There was only a small increase in heart rate in the order of 12 beats/min with scrotal warming. It is unlikely that changes in thermal stimulation of the scrotum due to postural variations in resting conscious dogs are primarily responsible for variations in cardio–respiratory function for the conditions of this study.

Download Full-text

Temperature-controlled optical stimulation of the rat prostate cavernous nerves

10.1117/12.2000541 ◽

2013 ◽

Cited By ~ 1

Author(s):

Serhat Tozburun ◽

Gwen A. Lagoda ◽

Michael A. McLain ◽

Arthur L. Burnett ◽

Nathaniel M. Fried

Keyword(s):

Optical Stimulation ◽

Temperature Controlled ◽

Cavernous Nerves ◽

Rat Prostate ◽

Stimulation Of

Download Full-text

Stimulation of Balanus balanoides and Fundulus heteroclitus by Dicarboxylic Acids

Physiological Zoology ◽

10.1086/physzool.10.3.30151416 ◽

1937 ◽

Vol 10 (3) ◽

pp. 327-341

Author(s):

Irwin W. Sizer

Keyword(s):

Fundulus Heteroclitus ◽

Dicarboxylic Acids ◽

Balanus Balanoides ◽

Stimulation Of

Download Full-text

The Control of Photo-Pigmentary Responses in Eyeless Catfish

Journal of Experimental Biology ◽

10.1242/jeb.15.3.363 ◽

1938 ◽

Vol 15 (3) ◽

pp. 363-370

Author(s):

URSULA WYKES

Keyword(s):

Fundulus Heteroclitus ◽

Posterior Part ◽

Bright Light ◽

The Body ◽

Nervous Control ◽

Low Frequencies ◽

Spinal Nerves ◽

The Brain ◽

Photic Response ◽

Stimulation Of

1. In common with certain other teleosts and lacertilians, eyeless Amiurus nebulosus and Fundulus heteroclitus show a pigmentary response to changes in intensity of illumination. The melanophores contract in the darkness and expand in bright light. The control of this photic response was investigated in Amiurus. 2. The contraction in darkness was not obtained in areas denervated by section of spinal nerves nor in the posterior part of the body after section of the cord. The response is therefore under the control of nervous reflexes passing through the brain. A similar melanophore contraction can be obtained by electrical stimulation of the cord at extremely low frequencies. 3. The response remained in pinealectomized animals. Photoreceptors may possibly be located in the skin or the wall of the diencephalon may be sensitive to light. 4. After hypophysectomy the response continues but the degree of melanophore expansion in bright light is diminished. The expanding hormone of the pituitary is therefore important in that it augments a melanophore response which is under nervous control.

Download Full-text

Pardaxin Produces Sodium Influx in the Teleost Gill-like Opercular Epithelia

Journal of Experimental Biology ◽

10.1242/jeb.105.1.83 ◽

1983 ◽

Vol 105 (1) ◽

pp. 83-94

Author(s):

NAFTALI PRIMOR

Keyword(s):

Active Transport ◽

Red Sea ◽

Fundulus Heteroclitus ◽

Serosal Side ◽

Na Current ◽

Sodium Influx ◽

Active Transport Of Ions ◽

Transport Of Ions ◽

Mucosal Side ◽

Stimulation Of

1. Transport by the gill-like opercular epithelium of the teleost, Fundulus heteroclitus, was affected by pardaxin, a protein that is toxic to fish, isolated from the Red Sea flatfish Pardachirus marmoratus. 2. Administration of pardaxin to the mucosal (seawater) side of the isolated short-circuited opercular epithelium, caused a transient stimulation of the active transport of ions (Isc), followed by an inhibition. The Isc stimulation was abolished by ouabain or/and in Na+-free Ringer but not in Cl−-or HCO3−-Ringer. When applied to the serosal (blood) side, pardaxin did not affect the Isc. 3. Pardaxin produced a net transient Na+ current from the mucosal side to the serosal side of 2.2 μequiv cm−2h−1. It is concluded that this Na+influx caused the Isc stimulation. The influx is suggested to be the mechanism of pardaxin's toxicity in fish.

Download Full-text

Effect of atriopeptin II on isolated opercular epithelium of Fundulus heteroclitus

AJP Regulatory Integrative and Comparative Physiology ◽

10.1152/ajpregu.1988.254.1.r27 ◽

1988 ◽

Vol 254 (1) ◽

pp. R27-R32 ◽

Cited By ~ 4

Author(s):

J. I. Scheide ◽

J. A. Zadunaisky

Keyword(s):

Fundulus Heteroclitus ◽

Short Circuit ◽

Short Circuit Current ◽

Chloride Secretion ◽

Chloride Cells ◽

Induced Response ◽

Ion Regulation ◽

Cyclic Monophosphate ◽

Stimulation Of

The effect of atriopeptin II (ANF) on the in vitro opercular epithelium was investigated by use of short-circuit current techniques. Serosal addition of ANF stimulates chloride secretion (short-circuit current) 19% above control values with a 7% increase in tissue conductance. Mucosal addition of ANF to the opercular epithelium was without effect. The ANF stimulation of the current was dose dependent with a maximum at 10(-7) M. The addition of ANF had no effect on the current or the conductance of opercular epithelia bathed in Cl--free Ringer. The opercular current could be stimulated above the ANF response by isoproterenol (10(-6) M). Pretreatment of the opercular epithelium with propranolol (10(-5) M) did not inhibit the stimulation of the short-circuit current by ANF but did inhibit the isoproterenol response indicating that the ANF stimulatory activity was independent of the beta-adrenergic receptors. The ANF-stimulated short-circuit current was found in operculi pretreated with tetrodotoxin (10(-6) or 10(-5) M) or diltiazem (10(-4) M) indicating the ANF response was not due to nerve stimulation. Pretreatment of opercular tissue with dibutyryl adenosine 3',5'-cyclic monophosphate, 8-bromoadenosine 3',5'-cyclic monophosphate, or 8-bromoguanosine 3',5'-cyclic monophosphate (10(-4) M) had no effect on the ANF stimulatory response. Opercular epithelia from short-term freshwater-adapted killifish also showed the ANF-induced response. The stimulation of chloride secretion in Fundulus heteroclitus chloride cells by ANF may have a role in teleost ion regulation.

Download Full-text