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studies on rana tigerina skin collagen.the current paper pertains to the study of frog skin, more specifically rana tigerina skin collagen, which is a major extracellular matrix protein known to play an important role in the wound-healing process. this study revealed interesting differences in the frog skin collagen when compared to the hitherto known vertebrate collagens. this could probably be attributed to the position of the amphibians in the vertebrate hierarchy. therefore, detailed investigations on the various physico-chemical ...200111163307
tigerinins: novel antimicrobial peptides from the indian frog rana tigerina.four broad-spectrum, 11 and 12 residue, novel antimicrobial peptides have been isolated from the adrenaline-stimulated skin secretions of the indian frog rana tigerina. sequences of these peptides have been determined by automated edman degradation, by mass spectral analysis and confirmed by chemical synthesis. these peptides, which we have named as tigerinins, are characterized by an intramolecular disulfide bridge between two cysteine residues forming a nonapeptide ring. this feature is not fo ...200111031261
interrelationship between food availability, fat body, and ovarian cycles in the frog, rana tigrina, with a discussion on the role of fat body in anuran reproduction.long-term experiments were conducted to study the progression of vitellogenic cycles in rana tigrina (an annual breeder) having different foraging backgrounds and held under conditions of weekly or daily food supply and in presence or absence of abdominal fat bodies. they were autopsied in june to assess fecundity. in nature an adult r. tigrina produces on an average 4,000 eggs/100 g body mass (b.m.) and spawns in june-july following monsoon rains. weekly feeding from july to next breeding seaso ...200010684572
ultrastructure of spermatozoa correlated with phylogenetic relationship between heteropneustes fossilis and rana tigrina.a study using transmission electron microscopy (tem) of the spermatozoa of rana tigrina and heteropneustes fossilis in all phases of the annual reproductive cycle revealed that there was a phylogenetic relationship between them. the spermatozoa of h. fossilis appeared horseshoe-shaped, somewhat oval or wedge-shaped at the anterior end and broader at the posterior end. the horseshoe-shaped spermatozoan nucleus was observed during spermiogenesis of r. tigrina but later changed into a finger shape ...199810093202
growth potential of rana tigerina skin lipids in cell cultures.this study involves the investigation of the lipid composition of the skin of rana tigerina which has a significant healing capacity. the results indicated that the lipid extract enhanced keratinocyte and fibroblast cell proliferation progressively and were found to be much more efficient in comparison to agents known to cause cell proliferation and to be anti-inflammatory such as hydrocortisone. cell proliferation was dose dependent and suppression occurred only at very high doses. [3h]thymidin ...20179719416
bioelectrical activity of brain in rana tigrina (daudin) in response to phosalone poisoning.an acute dose of phosalone, intraperitoneally injected to rana tigrina alters the bioelectrical activity of the brain. the frequency levels of delta, theta, alpha, and beta waves remained similar in both control and experimental groups, while the amplitude of the waves was significantly decreased by 40 to 60% in the latter group. the total work done (twd) was also significantly reduced. the above disturbance in the brain electrical activity may have correlation to the inhibition of cation-linked ...19979440249
light-induced changes in frog pineal gland n-acetyltransferase activity.n-acetyltransferase (nat) activity was determined in the pineal gland of frogs (rana tigrina) of different ages using 2-aminofluorene and p-aminobenzoic acid as substrates, and assayed by high-pressure liquid chromatography. frogs of different ages were either killed during the light phase or exposed to darkness or light for 1 min during the dark phase of the lighting cycle, then returned to their cages in darkness for 30 min before being killed. the pineal gland nat activity of 1-month-old frog ...19979308002
kinetics of acetyl coenzyme a:arylamine n-acetyltransferase from rapid and slow acetylator frog tissues.n-acetyltransferase (nat) activity was determined in 100 frog (rana tigrina) livers using 2-aminofluorene and p-aminobenzoic acid as substrates. overall, the liver nat activity of the 50 females was higher than the liver nat activity of the 50 males. the activities (mean +/- sd) of nat from the bladder, blood, colon, and liver of males was 0.30 +/- 0.11, 0.05 +/- 0.03, 0.09 +/- 0.05, and 0.93 +/- 0.56 nmol/min/mg protein for the acetylation of aminofluorene and 0.29 +/- 0.06, 0.36 +/- 0.04, 0.26 ...19968742223
phosalone poisoning on the cation-linked atpases of central nervous system of rana tigrina (daudin).an acute dose of phosalone, an organophosphate pesticide, widely used in crop fields, injected to rana tigrina, intraperitoneally, inhibited the different inorganic ion linked atpase enzymes of the central nervous system (cns). six discrete cns compartments, namely telencephalon, mid-brain, rhombencephalon, cervical spinal cord, thoracic spinal cord and lumbar spinal cord showed markedly diminished atpase activity. atpases inhibition affected the neuronal activity and muscular coordination leadi ...19958564785
mechanism of histamine induced dispersal response in the isolated web melanophores of a frog, rana tigerina (daud.).effects of histamine and specific h1, h2 receptor agonists have been investigated on the isolated web skin melanophores of the frog, r. tigerina. histamine, 2-methyl-histamine and 4-methyl-histamine all induced dose dependent dispersion in the frog melanophores. reserpine treatment of the frog skin, either in vivo, or in vitro potentiated the dispersal response of the frog skin melanophores elicited by histamine. histamine induced dispersal responses in the frog integumentary melanophores were p ...19957558194
changes in level of certain serum constituents following sciatectomy in the common frog, rana tigrina (daud).effect of unilateral (one leg) and bilateral (two legs) sciatectomy was studied on certain serum constituents in the male frog over a period of 3 weeks. the level of creatine kinase, acid and alkaline phosphatases, urea, glucose and proteins increased initially following sciatectomy and decreased subsequently from day 14 onwards, the per cent change being more pronounced in case of bilaterally sciatectomized frogs. the present results indicate an increase in the rate of deamination of proteins i ...19959135678
the cardiovascular and renal effects of hydrins and arginine vasotocin in frogs.cardiovascular and renal actions of hydrins and arginine vasotocin (avt) in frogs (rana tigrina and rana catesbeiana) were examined in view of their relationships as precursor/prohormone-hormones in the anuran amphibian. in vitro hydrins and avt respectively vasorelaxed and vasoconstricted kcl-preconstricted femoral artery in r. tigrina. avt also produced dose-dependent contractions on untreated preparations; hydrins had no effect on these preparations. both the hydrins and avt were positively i ...19938405885
distribution of corticotropin-releasing factor immunoreactive neurons in the brain of the tigerfrog, rana tigrina.the distribution of immunoreactive (ir) neurons containing corticotropin-releasing factor (crf) is described in the brain of the tigerfrog, rana tigrina. the olfactory bulb, medial pallium, nucleus of the diagonal band of broca and medial area of the amygdala of the telencephalon showed ir-crf perikarya. the anterior and ventromedial thalamic nuclei, and the magnocellular nucleus preopticus (npo) revealed several ir cells; a few npo neurons were cerebrospinal fluid contacting in nature. the nucl ...19938361644
gel filtration behaviour of arginase in frog liver and kidney extracts.the molecular weight of arginase, determined by gel filtration of frog (rana tigerina) liver and kidney extracts, varied with the protein concentration. it increased from about 25-27 kda in dilute solutions to about 92-96 kda in concentrated extracts. in addition, an arginase with a molecular weight of 45-49 kda appeared at intermediate concentrations. the results suggest the probable aggregation of arginase monomers to yield the dimeric and tetrameric forms of the enzyme at high protein concent ...20067689359
effect of calcium and calmodulin antagonists on metamorphosis in the anuran tadpole, rana tigerina.the fact that calcium ions regulate the secretion of thyroid hormones could be extended to explore how the mechanisms of anuran metamorphosis is controlled by thyroid hormones. in the present study, an attempt was made to investigate the effects of both calcium channel blocker, diltiazem (dt) and calmodulin inhibitor, trifluoperazine (tfp) on metamorphosis and various developmental stages of the anuran tadpole, rana tigerina. both dt (25 microm) and tfp (2 microm) treatments caused total inhibit ...19937949401
some aspects of vascular pharmacology of frog (rana tigrina).vascular autonomic receptors in amphibians exhibit difference from more evolved mammalian species. vascular perfusion studies in frog indicate constrictions by prominent muscarinic but rudimentary nicotinic constrictive regulation by cholinergic systems. difference from classical effect-patterns of pharmacological interventions, observed in the study, make room to visualise complexity of additional regulatory mechanisms.19921350773
studies on the life-cycle of pleurogenoides ovatus rao, 1977 (trematoda: pleurogenetinae).the life-cycle of pleurogenoides ovatus rao, 1977, infecting the frogs, rana tigrina and r. cyanophlyctis has been elucidated. all the life-cycle stages from egg to egg-producing adults were successfully established in the laboratory. the life-cycle took about 80 days for completion. cercariae were found in the freshwater snail. digoniostoma pulchella, collected from paddy fields at chelembra, malappuram district of kerala, during the monsoon months. cercariae are of the virgulate xiphidiocercou ...19912050984
seasonal changes in the cytomorphology of hypophyseal acth cells in relation to the reproduction cycle of the female of the frog rana tigerina (daud.).the hypophyseal acth (basophil type 3 or b3), cells of r. tigerina display seasonal changes in cytomorphology (nuclear, cytoplasm and cell area), staining intensity and cytoplasmic granulation. the cytoplasmic granules are fine and stain blackish purple with mcconaill's lead haematoxylin, with herlant's ab and the pas and og techniques they stain brownish red. the tinctorial response of their cytoplasm is pas- and og-positive and ab-negative. the b3 cells are low columnar or cuboidal in form and ...19911665370
the response of nucleus preopticus neurosecretory cells to ovarian pressure in the frog, rana tigrina.intraovarian pressure (iop) of 5, 15, and 25 mm hg was administered in the frog, rana tigrina, and the response of the nucleus preopticus (npo) pars magnocellularis was investigated with aldehyde fuchsin (af) stain and immunocytochemical method using neurophysin (np) antisera. the 5 mm hg iop treatment resulted in cell and cell nuclear hypertrophy (p less than 0.001); discrete signs of de novo synthesis of af-positive and np-immunoreactive material in the perikarya and remarkable increases in th ...19902289685
neurohypophysial hormones and cardiac activity in the frog, rana tigrina, and in the snake, ptyas mucosa.the cardiac effects of neurohypophysial hormones (nh) in the frog, rana tigrina, and in the snake, ptyas mucosa, were studied in isolated atrial preparations. arginine vasopressin (avp), vasotocin (avt), isotocin (isn), mesotocin (msn), and oxytocin (oxy) produced dose-related positive chronotropic and inotropic responses in the frog atria. avt was the most potent. in the snake, avp, avt, msn, and oxy produced dose-related positive inotropic but not chronotropic changes. oxy was the most potent. ...19902332147
inhibition of acetylcholinesterase in the central nervous system of rana tigrina by an organophosphate. 19902402003
variation of ascorbic acid content in the different tissues of the frog rana tigrina as a function of season.ascorbic acid concentrations of the liver, thigh, and cardiac muscles, ventral and dorsal skin, as well as muscles of the frog rana tigrina were higher during summer and lower in winter. ascorbate concentration also showed another high peak in february. the cardiac ascorbate showed minimal seasonal fluctuations.19902273642
blood carbohydrates and phosalone poisoning in rana tigrina (daudin).in rana tigrina, blood levels of total carbohydrates, lactic acid and pyruvic acid were determined in relation to allometric growth in both sexes. the blood carbohydrates content increased in relation to growth and maturity of gonads. treatment by phosalone resulted in the accumulation of lactic acid in blood suggesting that this organophosphate compound inhibits the normal oxidative metabolism.19892480092
studies of pathogenicity of the digenetic trematode ganeo tigrinum (mehra et negi) for the stomach of rana tigrina (daudin).ganeo tigrinum (mehra et negi) was seen to be attached to the stomach wall of rana tigrina (daudin) by suckers drawing out mucosal plugs. the tissues lodged inside the suckers were desquamated, ulcerated and necrosed. encapsulated flukes were seen in the submucosa. the stomach wall was completely dissolved at the site of entry of the fluke, while adjacent tissues were compressed. the gastric mucosa was mechanically compressed by the fluke. oedema, cellular infiltrate, dilated blood vessels and c ...19892634604
seasonal changes in energy reserves in the common frog, rana tigrina.liver glycogen and lipid, ovarian glycogen, and lipid index were used as criteria to elucidate energy changes associated with reproduction and biphasic pattern of dormancy (summer and winter) in the female forg, rana tigrina. liver glycogen showed 2 peaks; the ovarian glycogen showed reciprocal relationship with that of liver. the liver lipid and glycogen showed parallel trend.19892632907
temperature and adrenoceptors in the frog heart.1. cardiac adrenergic receptors in a frog, rana tigrina, were examined in winter and summer months using isolated atria preparation maintained at 24 degrees, 14 degrees and 6 degrees c. treatments included an examination of the atrial responses to selective alpha and beta adrenergic agonists (phenylephrine and isoproterenol respectively) and antagonists (phentolamine and propranolol). 2. basal atrial beating rates differed between summer and winter months and increased with temperature. 3. pheny ...19892576728
ultimobranchial body and parathyroid gland of the frog, rana tigrina in response to calcitonin administration.the effects of salmon calcitonin (0.25 mrc mu/g body wt) on the serum calcium and phosphate levels as well as on the activity of ultimobranchial body and parathyroid glands was investigated in the frog, rana tigrina for 15 days. the hormone evokes hypocalcemia (on day 1 and day 3) which is followed by a significant hypercalcemia on day 10. thereafter, the level of calcium decreases again on day 15. calcitonin induces hypophosphatemia (on day 3 and day 5). thereafter, hyperphosphatemia is recorde ...19892486619
larval energetics of rana tigerina (daud.). 19883397112
physiological correlates of surfacing behaviour--effect of aquarium depth on surfacing, growth and metamorphosis in rana tigrina.rana tigrina were reared from hatching to metamorphosis in aquaria containing different depths but equal volume of water. to exchange atmospheric air, tadpoles in the shallow aquarium surfaced less frequently, travelled shorter distance at less metabolic energy cost and hence grew larger (3.1 g) at a higher (25%) efficiency than those (2.5 g; 19% efficiency) reared in the deepest aquarium. aquarium depth is a more potent factor than po2 in the regulation of surfacing behaviour. the significant a ...19854095179
effect of photic manipulation on the level of melatonin in the retinas of frogs (rana tigrina regulosa).the level of melatonin in the frog (rana tigrina regulosa) retina was studied at midlight and middark in a 12l:12d cycle and under different lighting conditions. it was found that the frog displayed a diurnal rhythm of melatonin in the retina with high levels in the dark period. when the animal was subjected to an extended dark period, the level of retinal melatonin was significantly (p less than 0.05) increased. in addition, the normal low level of retinal melatonin in the light period was sign ...19854007481
effects of ionophore a23187 and lanthanum on pepsinogen secretion from frog esophageal mucosa in vitro.the role of ca2+ in the mediation of pepsinogen secretion from frog esophagus was investigated by means of ionophore a23187 and lacl3. the esophageal mucosa from asian bullfrog rana tigerina was mounted in a double-chamber system to preserve its polarity and was incubated in a medium containing 1.5 mm cacl2. pepsinogen secreted was measured and expressed as % of total. the basal secretion averaged 3.5%/h. bethanechol (25 microm), dibutyryl-camp (10 mm), ionophore a23187 (30 microm) and 3-isobuty ...19852579675
acute and chronic effect of carbaryl on survival, growth, and metamorphosis in the bullfrog (rana tigrina). 19836411006
tuberculosis in the frog rana tigerina (daud). 19836662562
serum calcium and inorganic phosphorus level of rana tigrina in response to glucagon administration.in rana tigrina, i.p. injection of glucagon (1 mg/kg/day) evokes a progressive hypocalcemia up to day 3 which declines after day 5. it also induces hypophosphatemia which continues throughout the experiment.19836825780
effect of electrical stimulation of the testis on the nucleus praeopticus pars magnocellularis of the frog, rana tigrina.the changes in the nucleus praeopticus (npo) pars magnocellularis of the frog rana tigrina were studied after electrical stimulation of the left testis. after a 3-min stimulation, the neurones of the nucleus showed a statistically significant increase in the nuclear and cellular diameters. the lateral neurones in particular showed a complete loss of nissl substance and other acute chromatolytic changes. in the aldehyde fuchsin stained preparations, however, the perikarya appeared filled with clu ...19827094013
neuroglia in amphibian (rana tigrina) central nervous system.neuroglia in the vertebrates are primarily classified as (i) ependymal and (2) non-ependymal gliocytes. in the present study neuroglia in the brain and spinal cord of frog (rana tigrina) has been studied under the light microscope using rapid golgi, holzer, and luxol fast blue-neutral red staining methods. ependymal glial cells with long processes having vascular and/or superficial terminal contacts, non-ependymal primitive glial cells (unipolar and bipolar) and phylogenetically more mature non- ...19817276540
blood glucose and pancreatic islets in frogs afer streptozotocin treatment.as to alloxan, the frog rana tigrina was found to be sensitive to streptozotocin also. an intravenous injection of 200 mg/kg body weight streptozotocin caused a delayed hyperglycemia which returned to normal levels after 120 hrs of the injection. the beta-cells of the endocrine pancreas underwent degranulation and necrosis and the hyperglycemia seems to be due to the deficiency of insulin. there was no visible effect on the alpha-cells, however. unlike alloxan, streptozotocin did not induce neph ...19816458222
203hg binding in the liver and kidney of the frog, rana tigrina.following a single i.p. dose of the radioisotope, 203hg was found to accumulate in both the high and low molecular weight (mw) fractions of the kidney and liver of the frog. the course of 203hg appearance in the 2 fractions varied in the liver; 203hg was exclusively associated with the higher mw fractions at 2 days whereas the radiotracer appeared in both low and high mw fractions at 4 and 7 days after administration. in the kidneys, however, 203hg was associated with high and low mw fractions a ...19807423543
effect of testosterone & clomiphene on seminiferous tubules of the indian bull frog rana tigerina (daud) during pre-spawning period. 19807429568
vascular responses to eserine in the frog (rana tigrina). 19807390604
hind limb regeneration capacity in tadpoles of the indian bull frog rana tigerina daud. 19807399594
comparative studies of blood coagulation in hibernating and non-hibernating frogs (rana tigrina).1. during hibernation in frogs (rana tigrina) there occurs prolongation of several clotting tests, viz, whole blood clotting time, plasma recalcification time, cephalin time and prothrombin time. 2. the ambient body temperature of the frog during winter hibernation is low and the retarded blood clotting at lower temperature may play an important protective role against intravascular thrombosis. 3. shorter plasma recalcification time in low-spun plasma as compared to high-spun plasma indicated th ...1979505409
seasonal variations in the drug-interactions on blood vessels of the frog (rana tigrina). 197940873
reserpine-resistant adrenergic mechanisms in the cardiovascular system of the frog (rana tigrina). 2013480982
histoenzymological analysis of mesencephalic auditory, tegmental and cranial nerve nuclei in the frog (rana tigrina).the distributions of acid and alkaline phosphatases, 5-nucleotidase, atpase, non-specific esterase, specific cholinesterase, succinic dehydrogenase and beta-galactosidase are described in the mesencephalic auditory, tegmental and cranial nerve nuclei of the frog (rana tigrina). the main results of the study are as follows: the laminar, principal, and magnocellular nuclei of the torus semicircularis, which are associated with auditory functions, show intense activity of specific cholinesterase. o ...1978214417
effect of seasonal variations and cold acclimation on serum transaminase activity of common indian frog rana tigrina.a definite seasonal change is observed in 2 transaminases, sgot and sgpt of r. tigrina. cold acclimation significantly depresses transaminase activity of serum.1978720502
tissue catecholamines in rana tigrina and effects of reserpine. 1978702951
life history & pesticide susceptible embryonic stages of the indian bull frog rana tigrina daudin. 1978568117
interaction of acetylcholine and caffeine on the isolated rectus abdominis of frog (rana tigrina). 2014151667
histoenzymological study of the gastrocnemius muscle of the common frog rana tigrina (daud.) during various stages of development. 1978680811
hematology of the common indian frog rana tigrina. iii. hemoglobin and hematocrit.the hemoglobin and hematocrit values studied in two years averaged 6.22 and 3.87 g/100 ml and 31.8 and 19.5 percent in female and male rana tigrina respectively. the peak values in females and males are observed in may and june respectively. the breeding season is characterized by low hemoglobin and hematocrit values. the starvation upto 28 days is observed to cause a decrease in hemoglobin level.1978646126
a note on the limb nerves of the frog (rana tigrina).in the frog (rana tigrina) the mean length of the brain was 17.5 mm and that of the spinal cord 61 mm. the weight of the brain and spinal cord (together) was 389 mg. the fascicular number, fascicular area, total number of fibres and their density were studied in the left and right brachial nerves, left and right sciatic nerves and the sympathetic trunk (nerve). the largest number of nerve fascicles (12) was noticed in the sympathetic trunk while the right brachial nerve comprised of only one ner ...1978646124
insulin administration in the frog rana tigrina: studies on the blood glucose and the histology of the endocrine pancreas.the effect of various doses of insulin (25-, 50-, and 150 u/kg body weight) on the blood glucose level and islet-cytology of the frog rana tigrina was studied until 96 h. following the hormonal administration the frogs exhibited hypoglycemia, abnormal neuromuscular activity and degranulation of both the insulin secreting beta- and glucagon secreting alpha-(alpha2-) cells of the pancreatic islets. the action of insulin was dose and temperature dependent; the higher the dose and temperature, the g ...1978369939
influence of alloxan administration on the blood glucose, islets of langerhans and some other tissues of the frog, rana tigrina.like majority of other vertebrates, the frog rana tigrina belongs to the alloxan sensitive group. alloxanization at doses of 300 and 500 mg/kg caused selective degenerative changes in the pancreatic beta-cells and a deficiency of insulin, which, in turn, provoked elevation of normal plasma glucose levels. the alpha-cells retained their normal structure. with the lower dose (200 mg/kg), however, many islets remained unaffected and there was no hyperglycemia. the fatal effect of alloxan on rana ti ...1978356673
chemoarchitectonics of the optic tectum of frog (rana tigrina). 1978152668
histoenzymological mapping on the distribution of beta-galactosidase in the central nervous system of frog (rana tigrina). 197899238
effect of the essential oil (e.o.) of psoralea corylifolia (linn) (p.c.) on isolated rectus abdominis of frog (rana tigrina). 2014407154
hematology of the common indian frog rana tigrina. ii. leucocytes.a study extending over a period of two years has been made on leucocytes differential count in common indian frog r. tigrina. as the values of differential count are almost similar in males and females, the data obtained for the two sexes have been pooled together. a table is given to compare the values of different leucocytes in r. tigrina with the values reported in other species of rana. the month to month variation has been recorded in various counts and an inverse relationship is observed i ...1977907186
haematology of the common indian frog rana tigrina i. erythrocytes.a study of erythrocyte count and size in rana tigrina has been made over a period of two years. the erythrocyte count exhibits a wide range showing a month to month variation in both the sexes. an average count of 15,93,600 in females and 10,29,700 per mm3 in males is recorded. these values are appreciably high from march to july with a peak in may and june for males and females respectively. the starvation brings about a decrease in counts generally from 12th day onwards. the size of erythrocyt ...1977883672
effect of acetylcholine on melanophores of rana tigrina.acetylcholine produced melanin aggregation and blanching of skin colour in rana tigrina, the common indian frog. the effects were more prolonged in frogs pretreated with an anticholinesterase agent. acetylcholine effects were not antagonized by either m-cholinolytic (atropine) or n-cholinolytic (pentolinium) agents, but were markedly inhibited by procaine. the results have been discussed in the light of the well-known membrane-stabilizing effect of procaine.1976955014
effect of catecholamines on melanophores of rana tigrina. 1976992813
a comparative study of histochemical mapping on the distribution of acid phosphatase and 5-nucleotidase in the forebrain of frog (rana tigrina).the four well defined dorsal, lateral, medial and intermediate olfactory tracts of the frog have been studied. during their courses they become intermingled with fibers related to the primordial septum, the primordial hippocampus, the primordial dorsal pallium and the primordial piriform areas. in acid phosphatase preparations all these tracts are completely negative, and, therefore, are not identifiable. however, these tracts have intense staining reaction to 5-nucleotidase throughout their cou ...19761087927
effect of cadmium on the testis of the indian bull-frog, rana tigrina daud. 1976992158
studies on osmoregulation in three trematodes of rana tigrina. 1976955693
histophysiology of the pancreatic islets of rana tigrina, treated with glucagon.the effect of mammalian crystalline glucagon (0.5 mg and 2.0 mg/kg) on the blood glucose level and pancreatic islets of rana tigrina was studied at different stages after its treatment. this frog is moderately sensitive to glucagon and exhibits hyperglycemia and regressive changes, primarily in the beta- and secondarily in the alpha-cells of the islet tissue. the effectiveness of the hormone depends upon the dose employed. the restricted damage in only a fraction of the alpha-cells indicates tha ...1976801307
effect of glucose administration on the blood sugar and pancreatic islets of the frog, rana tigrina.glucose evoked significant hyperglycemia in the frog, rana tigrina, 0.5 h after the injection and it took a longer time to regain normoglycemia than mammals, thus exhibiting a low glucose tolerance. the islet tissue of injected animals showed degranulation and atrophy of beta-cells only, the alpha-cells remained almost normal. this damage suggests that the beta-cells of this frog are functionally like those of mammals and other vertebrates, and secrete insulin. a single dose of glucose was found ...1976785932
effects of co60 gamma radiations on the conduction properties of frog sciatic nerves.the effect of co60 gamma radiations on the amplitude, detection period and duration of the action potential of sciatic nerves of rana tigrina frogs have been studied. dose levels of up to 120 kr were employed. irradiation of the nerves with dose levels upto 30 kr does not seem to affect the action potential profiles. the amplitude falls rapidly therafter, registering less than 5% of the orginal value after irradiation by a dose of 120 kr. qualitatively similar behaviour is seen in the case of de ...20141222995
seasonal variation in the structure & function of testis & thumb pad in the frog rana tigrina (daud.). 19751218897
studies on sterol/steroid biosynthesis from 3:4 dihydroxy phenyl alanine.homogenated tissue of gonads of rana tigrina were incubated in young's ringer solution containing 5 mg of 3:4 dihydroxy phenylalanine. an increase in the cholesterol and neutral-17-ketosteroids was found when compared with the control. perfusion of ovary with dopa gave similar results. however, there was a sharp drop (greater than 50%) in the cholesterol contents of the kidney and suprarenal under similar conditions. a postulated scheme of steroid biosynthesis from dopa is given.1975814771
multiple electrophoretic bands of serum albumin in rana tigrina. 19744435151
adrenoceptors in the heart of rana tigrina. 20134157019
spontaneous regeneration of the gastrocnemius muscle of the frog. rana tigrina. 19744833678
histochemical mapping of the distribution of adenosine triphosphatase, succinic dehydrogenase and non-specific esterase in the fore-brain of frog (rana tigrina). 19744280401
proceedings: the use of rana tigrina for experiments on dorsal and ventral spinal nerve roots. 19734767056
histamine librators and vasoconstriction in frog (rana tigrina). 19734128931
lipid changes in the tadpoles of rana tigrina during growth and metamorphosis. 19734709978
cellular composition of the pancreatic islets of the common indian frog, rana tigrina. 19734594553
-glucuronidase in the excreta of tadpoles of rana tigrina during growth and metamorphosis. 19725032166
dual cytologic localization of -glucuronidase in some organ-tissues of the frog (rana tigrina). 19725066106
histoenzymology of -glucuronidase in the leydig cells of testes of the frog (rana tigrina) and its relation to their annual secretory cycle. 19725052934
beta-glucuronidase in testes and ovaries of frogs (rana tigrina): a correlation of observations on histochemistry and biochemistry. 19724115324
effects of some indole-3-alkylamines on the melanophores of rana tigrina. 19714111403
beta-glucuronidase in alimentary canal of tadpoles of rana tigrina during growth and metamorphosis. 19715317794
histoenzymorphology of -glucuronidase in the resorbing tails of tadpoles of rana tigrina at metamorphosis. 19715004765
effect of varying environmental temperature on blood glucose level in indian frog, rana tigrina. 19705533835
insulin, tolbutamide, phenformin and blood sugar of rana tigrina. 19705526140
beta-glucuronidase in liver of tadpoles of rana tigrina during growth and metamorphosis. 19705440926
cytochemical study of glycoproteins in summer cells of adrenal of frogs (rana tigrina). 19705423337
hemoglobin polymorphism in indian frog (rana tigrina). 19695382967
seasonal changes in the lipids of the liver of the frog. rana tigrina. 19685750468
action of magnesium sulphate on melanophores of rana tigrina. 19685737359
mechanism of insulin secretion in beta cells of pancreatic islets of the frog, rana tigrina. 19684883079
nature of adrenergic receptors on the skin melanophores of rana tigrina. 19674383700
histamine liberators and melanophores of rana tigrina. 19674382178
studies on the carotid body in the frog rana tigrina daud. 19665990651
component fatty acids of body, depot, liver & visceral fats of indian frog (rana tigrina). 19665977567
a study on the cranio vertebral joint in the vertebrates. iv. in the amphibia as illustrated by its structure and development in rana tigrina. 19665987190
haemoglobins of indian frog (rana tigrina). 19655860845
chemical sterilization of male frogs (rana tigrina daud.). 196414202674
induction of ovulation in frogs (rana tigrina daud) by copper sulphate. 196314154191
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