Anemia in scurvy Anemia is frequently associated with scurvy women's health big book of exercises free pdf generic 20mg nolvadex mastercard, and may be either macrocytic breast cancer pumpkins nolvadex 10mg, indicative of folate deficiency menstrual 45 days nolvadex 10mg without prescription, or hypochromic women's health of boca raton cheap nolvadex 10 mg without a prescription, indicative of iron deficiency. Folate deficiency may be epiphenomenal, since the major dietary sources of folate are the same as those of ascorbate. However, some patients with clear megaloblastic anemia respond to the administration of vitamin C alone, suggesting that there may be a role of ascorbate in the maintenance of normal pools of reduced folates, although there is no evidence that any of the reactions of folate is ascorbate dependent. Iron deficiency in scurvy may well be secondary to reduced absorption of inorganic iron and impaired mobilization of tissue iron reserves (see below). At the same time, the hemorrhages of advanced scurvy will cause a significant loss of blood. There is also evidence that erythrocytes have a shorter half-life than normal in scurvy, possibly as a result of peroxidative damage to membrane lipids owing to impairment of the reduction of tocopheroxyl radical by ascorbate. Vitamin C requirements Vitamin C illustrates extremely well how different criteria of adequacy, and different interpretations of experimental data, can lead to different estimates of requirements, and to reference intakes ranging between 30 and 90 mg/day for adults. However, at this level of intake wounds do not heal properly because of the requirement for vitamin C for the synthesis of collagen in connective tissue. The alternative approach to determining requirements is to estimate the total body content of vitamin C, then measure the rate at which it is metabolized, by giving a test dose of radioactive vitamin. The studies were performed on subjects whose total body vitamin C was estimated to be 1500 mg at the beginning of a depletion study. However, there is no evidence that this is a necessary, or even a desirable, body content of the vitamin. It is simply the body content of the vitamin of a small group of people eating a self-selected diet rich in fruit. It is three times larger than the body content at which the first signs of deficiency are observed, and will protect against the development of any signs of deficiency for several months on a completely vitamin C-free diet. This means that as the experimental subjects become depleted, so the rate at which they metabolize the vitamin decreases. Thus, calculation of the amount that is required to maintain the body content depends on both the way in which the results obtained during depletion studies are extrapolated to the rate in subjects consuming a normal diet and the amount of vitamin C in that diet. Assessment of vitamin C status Urinary excretion and saturation testing Without a differential white cell count, leukocyte ascorbate concentration cannot be considered to give a meaningful reflection of vitamin C status. The different types of leukocyte have different capacities to accumulate ascorbate. This means that a change in the proportion of granulocytes, platelets, and mononuclear leukocytes will result in a change in the total concentration of ascorbate/106 cells, although there may well be no change in vitamin nutritional status. Stress, myocardial infarction, infection, burns, and surgical trauma all result in changes in leukocyte distribution, with an increase in the proportion of granulocytes, and hence an apparent change in leukocyte ascorbate. This has been widely misinterpreted to indicate an increased requirement for vitamin C in these conditions. Possible benefits of high intakes of vitamin C There is evidence from a variety of studies that high vitamin C status and a high plasma concentration of the vitamin is associated with reduced all-cause mortality. However, in addition to its antioxidant role and its role in reducing the tocopheroxyl radical, and thus sparing vitamin E, vitamin C is important in the absorption of iron, and in preventing the formation of nitrosamines. Both of these actions depend on the presence of the vitamin in the gut together with food, and intakes totaling more than 100 mg/day may be beneficial. Iron absorption Urinary excretion of ascorbate falls to undetectably low levels in deficiency, and therefore very low excretion will indicate deficiency. However, no guidelines for the interpretation of urinary ascorbate have been established. It is relatively easy to assess the state of body reserves of vitamin C by measuring the excretion after a test dose. A subject who is saturated will excrete more or less the whole of a test dose of 500 mg of ascorbate over 6 h. A more precise method involves repeating the loading test daily until more or less complete recovery is achieved, thus giving an indication of how depleted the body stores were. Blood concentrations of ascorbate the plasma concentration of vitamin C falls relatively rapidly during experimental depletion studies to undetectably low levels within 4 weeks of initiating a vitamin C-free diet, although clinical signs of scurvy may not develop for a further 3Â4 months, and tissue concentrations of the vitamin may be as high as 50% of saturation. In field studies and surveys, subjects with plasma ascorbate below 11 mol/l are considered to be at risk of developing scurvy, and anyone with a plasma concentration below 6 mol/l would be expected to show clinical signs. The concentration of ascorbate in leukocytes is correlated with the concentrations in other tissues, and falls more slowly than plasma concentration in depletion studies. Inorganic dietary iron is absorbed as Fe2+ and not as Fe3+; ascorbic acid in the intestinal lumen will both maintain iron in the reduced state and chelate it, thus increasing the amount absorbed. A dose of 25 mg of vitamin C taken together with a meal increases the absorption of iron by around 65%, while a 1 g dose gives a ninefold increase. This occurs only when ascorbic acid is present together with the test meal; neither intravenous administration of vitamin C nor intake several hours before the test meal has any effect on iron absorption. Optimum iron absorption may the Vitamins 185 therefore require significantly more than 100 mg of vitamin C/day. Inhibition of nitrosamine formation the safety of nitrates and nitrites used in curing meat, a traditional method of preservation, has been questioned because of the formation of nitrosamines by reaction between nitrite and amines naturally present in foods under the acid conditions in the stomach. In experimental animals nitrosamines are potent carcinogens, and some authorities have limited the amounts of these salts that are permitted, although there is no evidence of any hazard to humans from endogenous nitrosamine formation. Again, this is an effect of ascorbate present in the stomach at the same time as the dietary nitrites and amines, rather than an effect of vitamin C nutritional status. Pharmacological uses of vitamin C Several studies have reported low ascorbate status in patients with advanced cancer, which is perhaps an unsurprising finding in seriously ill patients. In controlled studies with patients matched for age, gender, site and stage of primary tumors and metastases, and previous chemotherapy, there was no beneficial effect of highdose ascorbic acid in the treatment of advanced cancer. High doses of vitamin C have been recommended for the prevention and treatment of the common cold, with some evidence that the vitamin reduces the duration of symptoms. Toxicity of vitamin C Regardless of whether or not high intakes of ascorbate have any beneficial effects, large numbers of people habitually take between 1 and 5 g/day of vitamin C supplements (compared with reference intakes of 40Â90 mg/day) and some take considerably more. Once the plasma concentration of ascorbate reaches the renal threshold, it is excreted more or less quantitatively with increasing intake, and there is no evidence that higher intakes increase the body pool above about 110 mol/kg body weight. Unabsorbed ascorbate in the intestinal lumen is a substrate for bacterial fermentation, and may cause diarrhea and intestinal discomfort. Ascorbate can react non-enzymically with amino groups in proteins to glycate the proteins, in the same way as occurs in poorly controlled diabetes mellitus, and there is some evidence of increased cardiovascular mortality associated with vitamin C supplements in diabetics. Up to 5% of the population are at risk from the development of renal oxalate stones. The risk is from both ingested oxalate and that formed endogenously, mainly from the metabolism of glycine. Some reports have suggested that people consuming high intakes of vitamin C excrete more oxalate in the urine. However, no pathway for the formation of oxalate from ascorbate is known, and it seems that the oxalate is formed non-enzymically under alkaline conditions either in the bladder or after collection, and hence high vitamin C intake is not a risk factor for renal stone formation. There is currently very little evidence on which to base reference intakes above those required to prevent (subtle biochemical) deficiency, but indices of enhanced immune system function and whole-body oxidative stress and other biomarkers may do so in due course. There are several compounds that have clearly defined functions in the body but can be synthesized in apparently adequate amounts, so that they are not considered to be dietary essentials. These substances have been receiving increasing attention, and these, in addition to other compounds, are likely to continue to stimulate interest and discussion in the future. Most fruits and green leafy vegetables contain relatively large amounts of flavonoids; altogether some 2000 have been identified, and average intakes of flavonoids from a mixed diet are of the order of 1 g/day. There is no evidence that bioflavonoids are dietary essentials, but they have potentially useful antioxidant actions. Oxidation of flavonoids may serve to protect susceptible nutrients from damage in foods and the intestinal lumen, and they may also act as antioxidants in plasma and tissues. Epidemiological evidence suggests that the intake of flavonoids is inversely correlated with mortality from coronary heart disease. Carnitine Carnitine has a central role in the transport of fatty acids across the mitochondrial membrane. It is synthesized in both liver and skeletal muscle by methylation of lysine, followed by two vitamin C-dependent hydroxylations. In experimental animals, deficiency of lysine has little effect on plasma and tissue concentrations, but methionine deficiency can lead to carnitine depletion, and carnitine has a methionine-sparing effect in methionine-deficient animals. Deficiency of vitamin C may result in impaired synthesis of carnitine in species for which ascorbate is a vitamin.
If the mother has received opiates during labour womens health tampa order 20 mg nolvadex with visa, then naloxone may be used to check that opioid depression is not causing continued respiratory depression in the apnoeic baby after the baby is suitably oxygenated and a reliable cardiac output has been established menstruation 9 jours order nolvadex 20 mg with mastercard. A continuous infusion of naloxone is the best way to counteract accidental opiate poisoning in infancy zeid women's health center cheap 20mg nolvadex otc. A 3 micrograms/kg oral dose of naloxone four times a day may help to reduce some of the constipation caused by morphine analgesia in preterm babies women's health program birth control purchase 10 mg nolvadex amex. It is not necessary to calculate a precise weight-related dose  an initial 200 micrograms dose (0. Intravenous use: A 100 micrograms/kg dose is of diagnostic help in opioid poisoning, and a continuous infusion of 50Â100 micrograms/kg/hour in glucose or glucose saline will control stupor if it re-emerges. Contraindications Administration of naloxone to the baby of an opiate-dependent mother could precipitate withdrawal symptoms. Nevertheless, there is, at the moment, still only one published report of this precipitating seizures during resuscitation (see web commentary). The mother had taken a very high dose of methadone (60 mg) 8 hours earlier, and documented fetal distress complicates the interpretation of this isolated case report. Disposable syringes containing 400 micrograms/ml are available in 1, 2 and 5 ml sizes (cost Ј13ÂЈ20). References (See also relevant Cochrane reviews) Akkawi R, Eksborg S, Andersson Е, et al. Effect of oral naloxone hydrochloride on gastrointestinal transit in premature infants treated with morphine. Effects of naloxone on the breathing pattern of a newborn exposed to maternal opiates. Myasthenia Myasthenia gravis is an acquired autoimmune disorder causing progressive muscle fatigue and weakness. About 10Â15% of the babies born to myasthenic mothers are affected by transient neonatal myasthenia due to transplacental transfer of antibodies directed against the acetylcholine receptors of the muscleÂnerve junction. There is no way of knowing before birth whether a baby is going to be affected or not, but most affected babies have mothers with high antibody titres and a history of affected siblings. In contrast, maternal disease is sometimes only recognised when the baby presents with symptoms at birth. Symptoms persist for months in the other congenital, recessively inherited forms of myasthenia, although they usually become less severe with time. Respiratory and feeding difficulty may cause prolonged apnoea, aspiration and even death. Ptosis is usually only seen in babies with maternally acquired autoimmune disease. Aminoglycoside antibiotics are hazardous in patients with any of the myasthenic disorders, because they interfere with neuromuscular transmission causing respiratory depression. Some congenital myasthenic syndromes do not respond to neostigmine and pyridostigmine. Pharmacology Neostigmine (first developed in 1931) inhibits cholinesterase activity, and therapy prolongs and intensifies the muscarinic and nicotinic effects of acetylcholine, causing vasodilatation, increased smooth muscle activity, lacrimation, salivation and improved voluntary muscle tone. It is therefore the drug of choice in the management of both maternal and neonatal myasthenia gravis. For this reason, most clinicians now prefer to use intramuscular neostigmine metilsulfate (with or without atropine to control any side effects) both for diagnostic and for maintenance purposes since this produces a response lasting 2Â4 hours after a latent period of 20Â30 minutes. Long-term management: Oral pyridostigmine (another anticholinesterase) is preferable in the long-term management of myasthenia because it has a slightly longer duration of action. The usual starting dose is 1 mg/kg by mouth every 4 hours (unless the child is asleep). Congenital myasthenic syndromes in childhood: diagnostic and management challenges. Neonatal myasthenia gravis: a new clinical and immunological appraisal of 30 cases. In resource-poor countries, continued daily prophylaxis (2 mg/kg for 2 weeks and then 4 mg/kg a day) greatly decreases the risk of infection during lactation. It is extensively metabolised by the cytochrome P450 isoenzyme system in the liver with a half-life of 40Â60 hours when treatment is first started. It is also reduced in patients on rifampicin but extended in patients taking a range of other drugs including cimetidine, erythromycin and fluconazole. The most important adverse effects with sustained use are skin rash (sometimes severe) and a potentially life-threatening hepatotoxicity (that may make it necessary to suspend or stop treatment); these are most common in the first months of treatment. Simple intrapartum prophylaxis in a resource-poor setting the following strategies are only appropriate in a previously untreated mother in a resource-poor setting. If started before delivery: Give a 200 mg oral dose of nevirapine at the start of labour to all mothers not on any retroviral drug treatment and one 2 mg/kg dose of nevirapine to the baby 2 days after birth. If started after delivery: Give the baby one 2 mg/kg dose of nevirapine by mouth as soon as possible after birth and 4 mg/kg of zidovudine by mouth twice a day for 7 days. Full intrapartum prophylaxis using several drugs See the recommendations in the monograph on lamivudine. Post-delivery multi-drug treatment of suspected infection Neonate: 2 mg/kg once a day for 2 weeks and then 5 mg/kg once a day in babies under 2 months old. Older babies: Start with 4 mg/kg once a day for 2 weeks and then 7 mg/kg twice a day unless a rash or other serious side effect develops. Such treatment should only be started where there is at least some provisional evidence that the baby has become infected, as discussed in the monograph on lamivudine. Adverse events associated with nevirapine use in pregnancy: a systematic review and meta-analysis. Intrapartum exposure to nevirapine and subsequent maternal responses to nevirapine-based antiretroviral therapy. Antiretroviral concentrations in breast-feeding infants of women in Botswana receiving antiretroviral treatment. It seems more effective than betamimetics and as good as atosiban at delaying preterm birth and may well be the best drug to use to delay delivery long enough for betamethasone (q. Pharmacology Nifedipine, introduced in 1968, causes a reduction in vascular tone (including coronary arteries) by reducing slow-channel cell membrane calcium uptake. All calcium channel blocking drugs also reduce cardiac contractility, but the vasodilator effect of nifedipine is more influential than the myocardial effect. It is quite well absorbed through the buccal mucosa (having some effect within 5 minutes) and then metabolised by the liver (adult half-life 2Â3 hours) before being excreted in the urine. Nifedipine passes into breast milk, but the nursing infant does not ingest clinically relevant amounts. Indometacin, ethanol (alcohol), nifedipine and the betamimetics, terbutaline and salbutamol (q. Antibiotic treatment does nothing to delay delivery in uncomplicated preterm labour, but treatment with erythromycin (q. Treatment Controlling preterm labour: Crush one 10 mg capsule between the teeth to achieve sublingual absorption. Up to three further doses may be given at 15 minute intervals while watching for hypotension if contractions persist. If this stops labour, give between 20 and 50 mg of modified-release nifedipine three times a day for 3 days. Some then recommend giving 20 mg three times a day until pregnancy reaches 34 weeks. Hyperinsulinaemic hypoglycaemia: 100Â200 micrograms/kg by mouth once every 6 hours seems to improve glucose control in some patients also taking diazoxide (q. Where there is no response, doubling or tripling the dose may occasionally be helpful. Hypertension in children: 200Â500 micrograms/kg by mouth every 6Â8 hours is now increasingly used to control hypertension and to treat angina in Kawasaki disease. Drug interactions the simultaneous use of magnesium sulfate sometimes causes sudden profound muscle weakness. A suspension containing 1 mg/ml can be prepared on request which is stable for a month if protected from light. Raynaud phenomenon of the nipple in breast feeding mothers: an underdiagnosed cause of nipple pain. Nifedipine versus labetalol in the treatment of hypertensive disorders of pregnancy. The quality of nifedipine studies used to assess tocolytic efficacy: a systematic review.
Most devices do not provide measurement of pharyngeal distending pressure but some include a pressure pop-off valve to prevent delivery of extremely high distending pressures pregnancy 4 weeks cheap nolvadex 20mg with visa. Available evidence suggests this effect may be the primary mechanism for Guidelines for Acute Care of the Neonate women's health clinic broadbeach discount nolvadex 20mg on line, Edition 26 3 menstrual cycles in 1 month generic 10mg nolvadex with amex, 2018Â19 Section 2-Respiratory Care Section of Neonatology womens health forum nolvadex 20mg low price, Department of Pediatrics, Baylor College of Medicine always be in conjunction with an oxygen blender to maintain saturations in target range and avoid hyperoxia. Calculation of effective FiO 2, Step 2 Effective FiO2 With Oxygen Concentration of Factor 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 18 19 20 21 22 23 25 27 28 29 30 31 33 36 38 40 42 43 44 50 55 57 60 63 67 71 75 80 83 86 100 0. In emergency situations, administer oxygen in amounts sufficient to treat cyanosis. As soon as this immediate goal is achieved, initiate SpO2 monitoring to evaluate adequacy of oxygenation and determine further needs. An oxygen blender and pulse oximeter should be available at the delivery of all infants. Initiate emergency resuscitation with 30% O2 for premature infants and room air for term infants. Administration of oxygen via oxyhood should be considered as the mode of choice since a more accurate measurement of the FiO2 being delivered is possible. Monitoring Pulse Oximetry Oxygen administration to neonates is most commonly monitored today with pulse oximetry. Movement artifacts and low pulse pressure may impair the efficacy of this technique. Artifacts of saturation measurement also may occur in the presence of highintensity light, greater than 50% Hgb F, and some radiant Table 2Â1a. Oxygen delivery through nasal cannulae to preterm infants: can practice be improved? Pulse oximetry measures O2 saturation of hemoglobin, not the PaO2; thus, at saturation ranges above 95% it is insensitive in detecting hyperoxemia. This shortcoming is of particular importance when oxygen is administered to premature infants less than 1500 grams. A strategy of targeted oxygen saturation is used for oxygen administration with or without positive pressure support. In premature infants or term infants with acute respiratory distress, adjust oxygen administration to maintain SpO2 in the 90-95% range. Arterial Blood Gas Eligibility Criteria Capillary Blood Gas this technique tends to underestimate PaO2 and is unreliable for oxygen monitoring. For eligible infants receiving low-flow nasal cannula oxygen therapy, keep the flow constant and reduce the oxygen concentration by 2% every 10 minutes until the FiO2 is 21% making sure that the infant is stable and the oxygen saturations remain 88%. It is recommended that the nasal cannula be removed from the nares but left affixed to the face, to not disturb the infant during the test. The infant is considered to have passed the test if the oxygen saturation remains 88% in room air. If the oxygen saturation is between 88 to 95% in room air, the infant should be monitored with documentation of heart rate, respiratory rate, and frequency of apnea and bradycardia every minute for 60 minutes in room air. The infant is considered to have passed the test only if the oxygen saturations are 88% during this 60-minute monitoring in room air. Test failure is defined as oxygen saturation 80 to 87% for 5 minutes or less than 80% for 1 minute. If the infant meets any of these criteria, the nasal cannula needs to be immediately resumed. Prior to administration of premedication, please ensure that all procedural equipment and emergency medications are readily available. On a chest radiograph, this corresponds to the tip being below the level of the clavicles and above the bifurcation of the trachea (approximately level of T3 - T4). This will allow us to make an accurate assessment of the tube position and prevent unnecessary adjustments. As with all modes of mechanical ventilation, blood gases, chest excursion and other indicators of ventilation must be monitored closely to avoid over ventilation and hypocarbia. Importance of Adequate Lung Recruitment In order for effective ventilation and pulmonary gas exchange to occur, lung inflation (recruitment) must be adequate. This allows the Conventional ventilation modes are recommended for initial management of neonates requiring ventilator support. Note: If the manual inflation button on the ventilator is pressed, the manual breath will be delivered at the set Pmax. Infants with apnea or very low spontaneous breathing rate may require higher back up rates to maintain adequate minute ventilation. As compliance improves, the ventilator will "auto-wean" (thus avoiding over-distension of the lungs) and a greater proportion of the Vt will be supplied by patient effort. If target Vt is too high, hypocarbia or diminished spontaneous breathing may occur. If 19 Section 2-Respiratory Care Section of Neonatology, Department of Pediatrics, Baylor College of Medicine Table 2-2. On occasion, persistent large leaks may require re-intubation with larger size tube. Adjusting Circuit Gas Flow - If there is no pressure plateau Synchronized Ventilation Synchronized modes are preferred in acute and chronic ventilation of infants to improve consistency of oxygenation, reduce work of breathing and reduce discomfort on the ventilator. In each of these modes, the patient breathes spontaneously while triggering some or all of the ventilator support breaths. Each of these modes of synchronized ventilation provide for a mandatory back up ventilation rate in case of apnea. If pressure plateau is longer than needed to complete inflation, consider reducing circuit gas flow or Ti. If Ti is too long, pressure plateau is held after cessation of inspiratory flow and there is no further increase in Vt. In A/C mode, the infant controls the respiratory rate and therefore ventilator rate. Ventilation (minute ventilation) is a function of respiratory rate and tidal volume. Continued vigilance is necessary to detect improving lung compliance to avoid lung over distention and alveolar rupture. In hypoplastic lungs, increases in delivered tidal volumeÂeven at high ventilator pressures is limited by poor compliance and the underlying low maximal lung volume. In such patients, minute ventilation can only be maintained by high breath rates  whether spontaneous or ventilator delivered. A/C is also suitable for improving comfort of many larger infants with acute lung diseases requiring ventilator support. All modes of synchronized ventilation must provide a backup mandatory ventilation rate in case of apnea. In either of the fast rate synchronized modes, the inspiratory time should be limited to 0. With each breath, inspiratory gas flow is delivered at a set pressure until that inspiratory flow decreases to a predetermined level (usually 15-25% of peak flow). Levels of 10-15 cm H2O are associated with optimal patient comfort and reduction in work of breathing. It can be unclear for physicians what the best mode of support is for infants who are ventilator dependent beyond 4-6 weeks of life. Depending upon individual patient physiology, such a strategy might utilize either volume targeted or pressure limited approach. As a group, such infants have significantly reduced ventilation and effective tidal volumes. Table 2-3 displays ventilator settings for which to consider extubation in most term and preterm infants. Depending on the clinical situation, some infants may either tolerate extubation at higher settings or be suboptimal candidates for extubation at these settings for non-respiratory reasons. AssistÂControl (A/C) In A/C mode, the patient breathes at his own spontaneous rate and each patient breath triggers a ventilator breath. In theory, A/C mode optimizes synchronization of patient and ventilator breaths and unloads work associated with asynchronous breathing.
Syndromes
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Warfarin (Coumadin) use
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Using poor judgment and losing the ability to recognize danger
You may be asked to stop taking aspirin, ibuprofen (Advil, Motrin), vitamin E, warfarin (Coumadin), and any other drugs that make it hard for your blood to clot.
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Types C and D are also known as Type II.
The time of formation of the bumps varies with the stock women's health wardenburg order 10mg nolvadex with visa, the compost menstruation questions and answers purchase nolvadex 20 mg visa, and the temperature women's health clinic gold coast bulk billing nolvadex 20 mg with mastercard. When bumps are formed pregnancy blood test 20mg nolvadex visa, the plug of the bag can be loosened slightly to allow air to enter into the bag to increase pigmentation. Under suitable conditions, the mycelial coat should be relatively thick with a shiny brownish color. Then the log can be soaked in cold water for 12 to 24 hours for enhancing fructification. After 2 months of spawn running indoors, the logs of high-temperature strains can be transferred to the field, and the plastic bag can be removed. Then the logs should be watered heavily in order to enhance the formation of pigmentation. In general, these high-temperature strains do not require cold shock treatment for fruiting. The fruiting bodies can be formed and will develop normally under natural conditions with regular fluctuation of temperature. Three Harvest Seasons With the method of cultivation of Lentinula in the field, there can be three seasons of harvesting ж autumn, winter, and spring. With robust mycelia and logs that have a high moisture content, management to obtain a good harvest involves the maintenance of a suitable temperature and good moisture conditions. When the first flush of mushrooms has been harvested, the mushroom beds should be ventilated for 3 to 4 hours. A week after harvesting, a white mycelium appears in the scars left by the picking of the mushrooms. The appearance of this mycelium indicates that the mycelium has recovered, and the range of relative humidity can be increased, which stimulates the formation of the second flush. It is common for autumn mushrooms to be harvested in three to five flushes with an interval of about 7 days between flushes. Winter Mushrooms: the season for winter mushrooms occurs during January and February, a period when the temperature is comparatively low, and consequently the mycelium grows slowly. The main requirement in management is to raise the temperature of the mushroom bed and to decrease the watering, which should be done to just keep the log moist. If a suitable temperature is maintained, two to three flushes can be produced with an interval of 10 to 15 days for each flush. This is the most productive season for the plastic bag-field cultivation method, with 70% of the total yield produced during this season. As the log has already produced two crops (autumn and winter), the water content of the log is reduced, and it should be soaked in water for 18 to 20 hours. To facilitate the uptake of water to restore the logs to their original weight, the mycelial coats of the logs are perforated with a metal punch. After soaking, the logs are stood on end on the mushroom beds and then covered with plastic. This raises the temperature and consequently increases the activity of the mycelium. Careful management of ventilation is required for the formation of fruiting body primordia and management of the fruiting process. On average, the spring mushroom has three to five flushes, with an interval of 9 to 13 days for each flush. Reasons for Abnormal Mushrooms Although production of shiang-gu in Fujian Province by the bag method was very good in 1985 and 1986, there were individual farmers who were not successful. Although there are several reasons for failure, the main reasons were lack of good fruiting and the production of abnormal fruiting bodies that were of low commercial value. This subject has been considered by Huang,9 who has observed that sometimes even though the mycelium grows well in the bag, there is not good fruiting, and sometimes the fruiting does not occur at a suitable time. He suggests that the main causes for abnormal mushrooms are (1) the use of an unsuitable variety as spawn and (2) the removal of the plastic bag before the mycelium has reached physiological maturity. Three types of spawn are used in China: 266 Mushrooms: Cultivation, Nutritional Value, Medicinal Effect, and Environmental Impact · Low temperature: A temperature less than 10C is required for fruiting. Similarly, if a spawn selected to give good results with wood log cultivation is used for sawdust cultivation in plastic bags, the results may not be good. That is, it is essential to select a spawn variety that is suitable for the local conditions and the method of cultivation to be used. Even with a good spawn and careful management after the bag has been removed, there will not be good fruiting if the bag is removed too early. Even if the log is soaked in water, the quantity of mushrooms will be small and usually of an abnormal type. It stands to reason that, if the mycelium has not grown well and matured, there will be a shortage of nutrients for the formation of fruiting bodies. Thus, if a fruiting body is formed, there may only be enough nutrients to form the stalk but insufficient nutrients to form the pileus. This would explain the frequent observation of abnormal mushrooms, which have a stalk but not a pileus, or just a small pileus. The mycelium grows well at a temperature of 24 to 25C, and it breaks down the sawdust substrate well at 27 to 30C. Therefore, if incubation has been at 25C or lower, the mycelium may grow well throughout the bag, but there may be very limited accumulation of nutrients by degradation of the substrate. Under these circumstances, in which mycelial growth has taken place at a suitable range of temperatures, it is important to place the synthetic log at the temperature of the upper limit (27 to 30C) for a period of time so that nutrients necessary for fruiting can be accumulated from substrate breakdown. It is to be noted that in these case studies of cultivation practices, many explanations are given without supporting experimental evidence. The scientific explanations will be forthcoming from the future studies of mushroom scientists, and, for the present, the explanations presented by these workers in China provide reasonable working hypotheses. Qingyuan As mentioned in the section on historical background, Qingyuan is the birthplace of the artificial cultivation of Lentinula edodes dating to about A. The County of Qingyuan is located in a tropical monsoon climate, which is considered ideal for the production of L. At present, only 20% of the production comes from cultivation on wood logs, the remaining 80% is obtained by using the synthetic sawdust log technique. The overharvesting of wood has impelled the government to encourage farmers to abandon the traditional log technique. The imminent environmental damage of logging wood for mushroom cultivation has spurred new technological breakthroughs including improving the average biological efficiency of approximately 100%. This efficient production of one county represented 10% of the world production and one fifth of the Chinese output in 1993. This was one of the reasons the city was officially named by the Chinese Government as "Shiang-Gu (Lentinula edodes) City of China" in 1994 (Figure 13. It is interesting to note that the total population of the county is just less that 200,000 people, of whom 120,000 are directly engaged in mushroom cultivation. In terms of jobs, in 1997, the mushroom industry employed an additional 4000 persons in the trading and marketing of mushrooms, and about 2000 people are engaged in the manufacturing of plastics for bagging substrates, sales, production and maintenance of machinery, printing of labels and packaging, and related businesses. It is the main source of revenue of the local government, and in recent years, the economic status of the population of Qingyuan is among the 100 richest counties of some 3000 counties in China. Today, some 280 traders are active each day, except during the Chinese New Year Festival. The success of the trading floor required a new expansion in 1999 with an additional 137 trading stalls. The market system and support services such as banking, hotels, and restaurants now employ 15,000 persons, of whom 3000 are paid directly by the traders. The spent substrate is now under study for its use as a medium for the cultivation of earthworms, which are a source of natural enzymes. In this way, the county expects to continue to increase the level of well-being of its population. In 1994, more than 300 people including 80 foreigners as well as the authors of this book attended this memorable event. Biyang Biyang in Henan Province is the home of the flower (cracked) mushroom (Figure 13. Biyang County is located about 400 km to the southwest of Zhengzhou, the provincial capital of inland Henan.
