I. Pedar. Gannon University.
Such plants could be made to flower without exposure to cold season in the first year itself cheap 60 mg levitra extra dosage overnight delivery impotence gandhi, when they are treated with gibberellins cheap levitra extra dosage 60mg fast delivery erectile dysfunction penile injections. Following the discovery of kinetin many other compounds showing similar activity were discovered. Varying mixtures of auxin and cytokinin influence plant growth and differentiation. Physiological effects of cytokinin m The most important function of cytokinin is the promotion of cell division. It is synthesised in large amounts by tissues undergoing ageing and acts as a natural plant growth hormone. Physiological effects of ethylene m Ethylene prevents elongation of stem and root in longitudinal direction. Simultaneously, the tissue enlarges radially resulting in thickening of plant parts. Physiological effects of abscisic acid m Abscisic acid acts as growth inhibitor and induces bud dormancy in a variety of plants. Growth inhibitors Some organic substances produced in the plant inhibit the plant growth. Explain the experiment to measure the actual longitudinal growth of plant by lever auxonometer. Write an account on cytokinin, ethylene and abscisic acid with their physiological effects. Photoperiodism and vernalization The response of a plant to the relative lengths of light and dark periods is known as photoperiodism. In plants, most significant photoperiodic response is the initiation of flowering. It has been first observed in Maryland Mammoth variety of tobacco (Nicotiana tabacum). From the observation of Garner and Allard all the plants do not require the same length of light and dark periods for flowering. The plants requiring longer exposure to light than their critical period are known as long day plants eg. The plants requiring light for a shorter period than their critical period are known as short day plants eg. The plants in which flowering is unaffected by the photoperiod are known as day neutral plants eg. One form absorbs red with the wave length of 660 nm called Pr and the other form absorbs far red with the wave length of 730 nm called Pfr. The two forms of phytochrome are interconvertible as shown below: Light Based on the absorption spectra, Pr is 660-665 nm also called P 660 and Pfr is P 730. In short Pr Pfr day plants, Pr promotes flowering while Pfr 730-735 nm suppresses it, while it is viceversa in long day plants. Darkness Vernalization The term vernalization was first introduced by a Russian scientist T. Many species, especially biennials and perennials o o are induced to flower at low temperature range of 1 C to 10 C. Techniques of vernalization The following are the steps to be taken to induce vernalization. Seeds are allowed to germinate and subjected to cold treatment for varying period of time depending on the species. Germinated seeds after this treatment are allowed to dry for sometime and then sown. Devernalization Reversal of the effect of vernalization is called Devernalization. Subjecting the plants to higher temperature after a cold treatment brings about devernalization. Practical application of vernalization Russian scientists have used vernalization to shorten the time of crop maturity by hastening the flowering processes which are brought about by cold treatment. The response of a plant to the relative lengths of light and dark periods is known as a. This dramatic increase in population, otherwise called population explosion has created its impact not only on the environment but also on food production. Increase in population, unplanned industrialization and migration towards cities and urban areas has resulted in the degradation of the environment. The present agricultural practices have polluted cultivable land physically, chemically and biologically. These factors lead to the shrinkage of the agricultural lands and a fall in agricultural production. Food production In order to fight the menace of hunger and malnutrition, we need crops with greater yield and better nutritive value. The quantity and quality of crops can be improved by modern scientific methods through genetic manipulation called genetic engineering. However, the time old concept of breeding plants either interspecific or intraspecific to bring out the best hybrid plant in plant breeding programmes still remains in vogue even today. A plant breeder strives to get a group of plants or a variety with suitable combination of genes that gives better yield and improved quality under a particular set of environmental conditions. A single species is a group of assemblage of innumerable number of genetic types such as lines, strains, etc.
The canonical Wnt signal ing pathway promotes chondrocyte differentiation in a Sox9-dependent manner levitra extra dosage 40 mg without prescription impotence due to diabetes. Identification and characterization of calcifying valve cells from human and canine aortic valves levitra extra dosage 40mg otc zolpidem impotence. Atorvastatin Inhibits Hypercholesterolemia-Induced Calcification in the Aortic Valves via the Lrp5 Receptor Pathway. Treatment with simvas tatin suppresses the development of experimental abdominal aortic aneurysms in normal and hypercholesterolemic mice. Statins but not angiotensin-con verting enzyme inhibitors delay progression of aortic stenosis. Rosuvastatin affecting aortic valve endotheli um to slow the progression of aortic stenosis. Abnormal aortic valve develop ment in mice lacking endothelial nitric oxide synthase. Anionic growth factor activity from car diac valve endothelial cells: Partial purification and characterization. Porcine cardiac valvularsubendothelial cells in culture: cell isolation and growth characteristics. Role of human valve interstitial cells in valve calcification and their response to atorvastatin. Glycoproteins synthesized by cultured cardiac valve en dothelial cells: unique absence of fibronectin production. Wnt/beta-cate nin signaling stimulates chondrogenic and inhibits adipogenic differentiation of peri cytes: potential relevance to vascular disease? Targeting of nitric oxide synthase to endothelial cell caveolae via palmitoylation: implications for nitric oxide signaling. Hypercholesterole mia decreases nitric oxide production by promoting the interaction of caveolin and endothelial nitric oxide synthase. Human pulmonary valve progenitor cells exhibit endothelial/mesenchymal plasticity in response to vascular endothelial growth fac tor-A and transforming growth factor-beta2. Syn ergy, redundancy and pleiotropy of cytokines affecting the regulation of erythropoie sis. The universal properties of stem cells as pinpoint ed by a simple discrete model. Pathogenesis of calcific aortic valve disease: a disease process comes of age (and a good deal more). Menopause: endocrinology and symptoms Menopause is a physiologic process in women that occurs around 45-55 years old, which is defined as permanent cessation of menstruation by one year in row . The age of meno pause depends on multiple factors such as number of ovules from the female at birth, the frequency of loss of these ovules through her life and the number of ovarian follicles re quired maintaining the menstrual cycle. The diagnosis of menopause is retrospective and is established after a year without menses , and their symptoms may have different intensi ty for each woman . Hot flushes are one of the main symptoms associated with menopause and occur in more than 75% of menopausal, consisting of intense episodes of heat that begins on chest and spreads to face, sweating, and flushing of face. The mechanism of hot flushes is not clear, however, it is known that hypothalamus, pituitary gonadotropin releasing hormone and gonadotrophins may be involved in hot flushes . Another fre quent symptom is an oral dryness and intense burning sensation that affects mainly the tongue and sometimes lips and gums . On the other hand decreases the content of collagen and elastic fibers of the skin, so that it becomes thinner and brittle losing elasticity and firmness. The epidermis thins, increases water loss and reduces the number of blood vessels, compromising the supply of oxygen and nutrients . Additionally aging is associated with a natural decline in physiological functions, including a loss of muscle mass and strength. Another alteration that occurs is the osteoporosis, which is defined as a skeletal disorder characterized by decreased bone density and an increased risk of fractures [17, 18]. Other disorders such as obesity and metabolic syndrome also occurs at menopause, suggesting that menopause may be the trigger of the metabolic syndrome at that stage of life [27, 28]. Estrogens are synthesized from different androgen precursors such as androstenedione and testosterone, yielding as products estrone and 17-estradiol, respectively. The toxic effect of 4-hydroxyestrogens probably is prevented under normal conditions intracel lular defense mechanisms. Oxygen free radicals can be removed immediately transformed into water by enzymes such as catalase and superoxide dismutase and antioxidant vitamins 294 Oxidative Stress and Chronic Degenerative Diseases - A Role for Antioxidants such as ascorbic acid and alpha tocopherol, quinone themselves can be inactivated by sulfo compounds, such as glutathione . Serum -glutamyltransferase, glutathione and malondialdehyde levels in the pre- and postmenopausal women . Data showing departures from normality are expressed as median values with the respective lower and upper quartile. Another finding is the lipoperoxide level which was significantly increased in perimeno pausal women (Table 3). Data showing departures from normality are given as median values with the respective lower and upper quartile. Profile oxidant and antioxidant between premenopausal and perimenopausal women . Pansini demonstrated that the total body fat mass increases significantly in postmenopause in comparison with premenopause, with specific increases in fat deposition at the level of trunk (abdominal and visceral) and arms.
Start intravenous fluids order levitra extra dosage 60 mg fast delivery erectile dysfunction doctor austin, restrict oral fluids and and snails buy discount levitra extra dosage 60 mg on-line erectile dysfunction treatment garlic, are extremely common. Resulting fibrosis leads to stricturing and treatment for opisthorchis but is ineffective against dilation, secondary bacterial infection and stone fasciola, for which bithionol 1g tid alternate days for development. Recurrent inflammation may result in cholangiocarcinoma, (1) Failure of non-operative treatment. The liver is tender and enlarged and the gallbladder may In the presence of septicaemia and an enlarged gallbladder, be palpable. Make a right subcostal (Kochers) or midline incision (11-1) extending up to the costal margin. The Kochers incision gives better access to the Removing the gallbladder is the standard method of gallbladder itself, but the midline incision better access to treating chronic gallbladder disease, but it is not an the bile duct, and any other pathology that may be present. Unfortunately, you will not be able to predict if the operation is going to be easy or difficult. So, be prepared to bail out: abandon the operation, or limit yourself to a cholecystostomy after all. We describe 2 methods of removing the gallbladder: (i) the retrograde in which you first dissect and tie its neck, and (ii) the antegrade in which you start at the fundus. The commonest cause of an injured bile duct or hepatic artery is an easy operation done quickly. Use a perioperative diseased gallbladder downwards and backwards towards the duodenum. Feel for stones in the gallbladder Take a Lahey swab (15-4C,E), and gently push apart the and in the bile ducts. Feel both lobes of the liver to be sure peritoneum, so that you see the junction of the common they are smooth and normal. There are some important anatomical run your hand over the right lobe of the liver, divide the variations: falciform ligament across the dome of the liver, and draw (1) The common bile duct and the cystic duct may join it down. The cystic duct may be very short the liver - do not forget to remove them afterwards! Insert a self-retaining retractor, and try to see the (2) The right hepatic artery may pass behind the common gallbladder. Get the anaesthetist to empty the stomach with hepatic duct (15-3A, B, more common) or in front of it a nasogastric tube. Divide any hepatic (27%) or the left hepatic artery (5%), or from other omental adhesions to the gallbladder, if present. Be sure of your landmarks before you start to divide If the gallbladder is acutely inflamed, perform a anything. Be sure to identify 2cm of the common duct, both stones, and is firmly stuck to nearby structures, leave it proximal and distal to the junction. This will give you an alone, or take out the stones and perform a idea of its course and direction. Removing such a gallbladder will be to the right of the structures going to the porta hepatis, and very difficult. The epiploic foramen (of Winslow) to find other branches and deal with them in the same way. Start by common bile ducts, and you are sure that what you making a small nick in the peritoneum with a long pair of presume is the cystic duct is going to the gallbladder, Metzenbaum scissors. This is the time to perform an operative or a Lahey dissecting swab, open up enough of the cholangiogram if you can and you are still not sure. Be careful not to cut any small blood cleft between the cystic and common hepatic ducts. Cut the cystic duct just flush with the Lahey clamp, leaving enough tied cystic duct behind, so your ligature will not slip off. You should now be able to strip the gallbladder from its bed by pulling it gently upwards on the clamps. Cut any peritoneal bands that join it to the liver (15-4H), but tie off anything else: there may be a vessel or an anomalous bile duct inside a strand. It is unnecessary and dangerous to close the peritoneum over the bed of the gallbladder. Check to make sure that the stump of the cystic duct is secure and that no bile is leaking. Use this if you cannot readily find the cystic duct, common bile duct, and hepatic artery. Place a gallbladder clamp or sponge-holding forceps on the fundus of the gallbladder, and divide the peritoneum between the fundus and the liver. Mobilize the gallbladder in this way anteriorly and posteriorly, continuing till you reach the neck of the gallbladder. Place a soft rubber drain through a stab wound down to the porta hepatis if tissues are inflamed or you are not certain that the cystic duct ligature will hold: a controlled bile leak is better than an uncontrolled one! Rarely this is a malignant mass, which is forever operation of choledochojejunostomy-en-Y using a Roux inoperable. Learn from your mistakes, seek to be able to If you palpate stones in the common bile duct, or find forgive yourself, and carry on. Perform a post-extraction operative the blood pressure falls, and there are signs of a cholangiogram, if you can. Reopen the abdomen, extend the incision, suck out all the If the cystic artery bleeds from the depths of the blood and insert packs to control the haemorrhage. Then try to visualize the bleeding vessel, clamp it and tie it (1);Insert warm moist packs, apply pressure and wait off. Treat with gentamicin or a hepatic artery) in the free edge of the lesser omentum cephalosporin. Perform an ultrasound if you can to locate between your index finger and your thumb (the Pringle and quantify the amount of liquid.
These subjects have a similar difference in diastolic pressure ranging from 78 to 73 mm Hg buy cheap levitra extra dosage 60mg on line erectile dysfunction medications that cause, a difference of 6% purchase 40 mg levitra extra dosage with amex erectile dysfunction treatment edmonton. These results were consistent in several studies regardless of quintiles being compared. Such relationships have also been identified in Chinese-American population; both men and women aged 60-96 years without antihypertensive treatment. This study revealed a statisti cally significant difference between the values of systolic and diastolic pressure in upper and lower quintiles of 14% (21 mm Hg) and 9% (8mmHg) respectively. It appears that vita 474 Oxidative Stress and Chronic Degenerative Diseases - A Role for Antioxidants min C has a lowering effect on systolic rather than diastolic pressure. Supplementation with vitamin C (1g/day) does not influence the diastolic pressure. Subjects with low vitamin C levels in serum have a high risk of developing stroke compared with those with high values in plasma of the vitamin. Hypertensive subjects, usually overweight, and low levels of se rum vitamin C have the same risk. The increase in the consumption of vitamin C during periods of fat restriction occurs on the one hand a reduction in blood pressure. Thus dietary antioxidants en hance the production of prostacyclin for the purification of free radicals and peroxides that inhibit prostacyclin synthase. Vitamin C and blood pressure then are related, because it has a lowering effect on blood pressure especially when fat intake is low. Ascorbic acid and cardiovascular disease Vitamin C acts as a regulator of the catabolism of cholesterol into bile acids in the guinea pig and is an important factor in the regulation of lipid in several animal species (rabbit, horse, and rat). Correlation studies in humans have shown an inverse relationship between vitamin C in take and mortality from cardiovascular disease. Experimental and observational studies in humans have been inconsistent but indicate that individuals with high cholesterol consumption, greater than or equal to 5. This effect is explained by the promotion or in hibition of degradation of prostacyclin and its implications for thrombosis and atherogene sis, in addition to its protective effect on lipid peroxidation. In patients with high cardiovascular risk, supplementation with antioxidant vitamins shows no reduction in over all mortality or incidence of any vascular disease, cancer or other adverse events. Recent findings indicate a relationship between the nutritional status of vitamin C (as meas ured by the concentration of ascorbate in serum), biological markers of infection and haemo static factors and support the hypothesis that vitamin C may protect against cardiovascular events through effects on the haemostatic factors in response to infection. This relationship is surprising given the uncertainty and potential error in the estimation of consumption of vitamin and vitamin C status assessment (determined mostly by food intake records of 24 h blood samples isolated). Add to this the wide variation between subjects is greater than within the same subject. Lower socioeconomic status and smoking are associated with low concentrations of ascor bate and high concentrations of homeostatic factors that may be confounding factors in cross-sectional studies. The inverse association between homeostatic factors and serum concentrations of ascorbate is strong and consistent, however only some markers of infection (e. C-reactive protein and 1-antichymotrypsin) are related inversely and significantly with serum ascorbate. It is possible that this low concentration of ascorbate may be the result rather than the cause, of a biological response to infection. The strong relationship between serum ascorbate and diet ary intake suggest however that their serum concentrations reflect the nutritional status of the vitamin. The various studies reported in the literature indicate that vitamin does not prevent respira tory infection but may modulate the biological response, leading to less severe disease, so it has a protective function in lung function. Effect of antioxidants in cardiovascular disease It has been suggested a protective effect of antioxidants such as vitamin C, A (-carotene) and E plus selenium in cardiovascular disease. Prospective studies so far have documented an inverse relationship between vitamin C intake and cardiovascular disease, and a strong protective effect of vitamin E supplementation on coronary patients. Finnish and Swiss studies showed that blood levels of ascorbate and therefore a diminished nutritional status of vitamin predicts myocardial infarction. Mediterranean studies showed a 70% reduction in mortality and risk of myocardial infarction independent of the effect on blood pressure and lipids. The infection may contribute to the inflammatory process observed in atherosclerosis. C-reactive protein and alpha-1 antichymotrypsin are acute phase proteins are synthesized in hepatocytes in large numbers in inflammatory processes. Elevated fibrinogen favors these mechanisms and therefore an increased cardiovascular risk. In this way a reduction in diet ary intake in winter for instance, would lead to lower serum ascorbate levels, an increase in susceptibility to infection and the factors haemostatic factors and therefore to an increase in cardiovascular mortality. Increased intake of vitamin C to 90-100 mg/day can increase in these subjects more than 60 umol/L, which has a significant effect on all risk factors. Ascorbic acid and immunity In stress situations the adrenal glands react liberating a large number of active and ready hormones. It has been suggested that 200 mg of vitamin C per day can reduce stress levels caused by these hormones. Megadoses of vita min C increases the body levels of antibodies in animal models (rats stressed and un stressed) having the highest values stressed rats. Healing is characterized by synthesis of connective tissue, whose main component is colla gen. Ascorbic acid supplementation is necessary for healing since this is oxi dized during the synthesis of collagen. The collect ed cells from the blood, peritoneal or alveolar fluid usually contain high concentrations of vitamin C (1-2 ug/mg protein). Guinea pig neutrophils produced H O and destroy staphy2 2 lococci in the same way they do control cells.