Abstract：
:Chimeras are the result of fusion of two zygotes to form a single embryo, producing an individual with genetically different kinds of tissue. If the fused zygotes are of different sex, the individual develops both ovarian and testicular tissues. The majority of these people are best reared as females and many pregnancies with living offspring have been reported in persons reared as females, and several cases has fathered a child. During ovulation, a negative pressure occurs in the lumen of the oviduct and it produces a vacuum effect which has made several pregnancies possible in subjects lacking an ipsilateral ovary by allowing the transperitoneal migration of oocyte from the contralateral gonad. Self-fertilization was reported in many flowering plants, in a kind of fish and in a case of rabbit. They have both eggs and sperms in their body and at fertilization, one sperm cell fuses with oocyte to form an embryo. Self-fertilization may also occur in human. A scenario is presented here for a woman to have a son without a father: she is a chimera of 46,XX/46,XY type resulting from the fusion of two zygotes of different sex types and she develops both ovary and testis in her body. Since XX cells tend to gather on the left side while XY cells on the right, she develops an ovary on the left side with a oviduct and a testis on the right side located in an ovarian position with no duct. Müllerian duct regression on the right side is mediated by the antimüllerian hormone derived from the ipsilateral testis and testosterone secreted from Leydig cells does not prevent the regression of the Wolffian duct. Therefore, neither an oviduct nor an epididymis and vas deferens is present next to the testis on the right side, and lumens of a well-developed rete testis have an open access to the abdominal cavity allowing the sperms to be picked-up by the contralateral oviduct. Both gonads are functional and produce spermatozoa and oocyte respectively after puberty. At the time of ovulation, estrogens increase the motility of the oviduct on the left side which results in a negative pressure in the tube and oocyte and sperms are picked-up into the tube with the help of this vacuum effect, taking both gametes to the fertilization site in the oviduct. Since the sperm contains a Y chromosome, this fertilization gives rise to a XY male embryo.
journal_name
Med Hypothesesjournal_title
Medical hypothesesauthors
Irmak MKdoi
10.1016/j.mehy.2010.04.021subject
Has Abstractpub_date
2010-11-01 00:00:00pages
448-51issue
5eissn
0306-9877issn
1532-2777pii
S0306-9877(10)00195-7journal_volume
75pub_type
杂志文章abstract：:In both African AIDS populations and homosexual populations outside of Africa, a high incidence of syphilis and multiple exposures to infectious diseases results in frequent, often abusive use of antibiotics. Epidemiological evidence exists for chemical immunosuppression resulting from antibiotics and other prescribed...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(86)90036-8
更新日期：1986-12-01 00:00:00
abstract：:Ebola virus (EBOV) infection is associated with modulation of cytokine expression in infected patients. EBOV has been shown to interact directly with immune cells (at minimum with macrophages and dendritic cells) and modulation of cytokine expression has also been observed in vitro, which is similar to that in vivo. T...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2015.05.009
更新日期：2015-09-01 00:00:00
abstract：:Acute disseminated encephalomyelitis (ADEM) is defined as a multifocal, monophasic, demyelinating, and inflammatory disease involving the central nervous system. It typically begins within 6 weeks of an antigenic challenge such as infection or immunization. Perivenous inflammation, edema and demyelination are the path...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2006.10.061
更新日期：2007-01-01 00:00:00
abstract：:Infantile neuroaxonal dystrophy (INAD) and Duchenne muscular dystrophy (DMD) are two deadly neuromuscular degenerative diseases of childhood. Knowledge on their pathophysiological mechanisms may direct us towards treatment or a cure. Although these diseases are caused by two totally different gene-mutations and cause ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2020.109589
更新日期：2020-04-01 00:00:00
abstract：:It is proposed that, in addition to genetic factors involved in immune attack on myelin, higher concentrations of nerve growth factor in certain tissues during development determine susceptibility to multiple sclerosis. High early nerve growth factor in some vasculature of spontaneously hypertensive rats increases sym...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/s0306-9877(98)90071-8
更新日期：1998-12-01 00:00:00
abstract：:Tourette syndrome is a chronic, idiopathic, childhood onset neuropsychiatric disorder with both motor and vocal tics. Tourette syndrome occurs worldwide and the clinical features are similar irrespective of the country of origin, with genetic causes suspected, but to date not proven. A link between red hair colour and...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2009.03.052
更新日期：2009-11-01 00:00:00
abstract：:The essential trace element selenium is known to be capable of reducing the toxicity of heavy metals like cadmium(II), mercury(II) and silver(I). One mechanism by which this occurs is through the formation of an inert metal selenide like silver selenide. It is not clear why selenide should react in the body preferenti...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(87)90107-1
更新日期：1987-10-01 00:00:00
abstract：:The inverse association between maternal folate status and incidence of infants born with neural tube defects (NTD's) was recognized over twenty years ago and led the US health agencies in the early 1990s to recommend that women of childbearing age consume 400 microg of folic acid each day. The FDA followed by mandati...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2008.04.013
更新日期：2008-09-01 00:00:00
abstract：:In 1937, Drs. Moritz and Oldt described arteriolar injuries in the kidneys (and other viscera) in hypertension, across the age range, in both sexes, and, in different races. This hypothesis proposes that injuries to vasomotor nerves cause the arteriolar injury in the kidney in hypertension, (as well as that in the ute...
journal_title：Medical hypotheses
pub_type： 历史文章,杂志文章
doi：10.1016/j.mehy.2017.12.025
更新日期：2018-02-01 00:00:00
abstract：:A localized graft-versus-host reaction was used to assess the cellular immunity of mice supporting progressive growth of an allogeneic tumor. It was found that early in tumor development anti-tumor-cellular-mediated immunity was hyper-responsive, and that adherent phagocytic cells isolated from the neoplasm would inhi...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(79)90050-1
更新日期：1979-09-01 00:00:00
abstract：:Lipid peroxidation has been shown to both enhance carcinogenesis and to have an anticarcinogenic effect. This paradox is of great relevance to the fields of free radical biology, biochemistry, pathology, nutrition and oncology among others and needs to be addressed. A proper understanding of this issue can be a key to...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/s0306-9877(96)90120-6
更新日期：1996-06-01 00:00:00
abstract：:Organogenesis is the result of cell allocation followed by cell differentiation, and the processes involved are still to be elucidated. Present-day teaching suggests that the cytoplasmic membrane, the extracellular matrix and the cytoskeleton, in combination, are responsible, but the literature also suggests that othe...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/s0306-9877(96)90249-2
更新日期：1996-03-01 00:00:00
abstract：:The present analysis addresses the question of how it has been possible for academic medicine to grow and lose its creative productivity at the same time. A mathematical model is developed to simulate the mechanisms that govern growth of medical systems over time. Time-dependent growth of system size increases the occ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2005.02.028
更新日期：2005-01-01 00:00:00
abstract：:The results described in this paper partially agree with the hypothesis that mesenteric lymph nodes (MLN) of depleted growing rats recover their antigen specific determinants after the oral administration of 20% casein for 5-9 days following the time course of antigen dependent changes observed in virgin lymph nodes. ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(87)90058-2
更新日期：1987-08-01 00:00:00
abstract：:Endothelial dysfunction due to reduced bioavailability of nitric oxide (NO) is an early step in the course of atherosclerotic cardiovascular disease (CVD). NO is synthesized from L-arginine via the action of NO synthase (NOS), which is known to be blocked by endogenous L-arginine analogues such as asymmetric dimethyla...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2007.01.053
更新日期：2007-01-01 00:00:00
abstract：:Micelle is a stable, passively targetable and solubilizing minute particle, and plays a key role to anticancer drug delivery for chemotherapy. With an increasing number of novel polymeric micelles synthesized, many anticancer drugs have been core-encapsulated in the micelles. However, only single drug was studied as t...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2008.05.002
更新日期：2008-09-01 00:00:00
abstract：:Selective serotonin re-uptake inhibitors (SSRIs), has been increasingly used for the treatment of premature ejaculation over the past 5 years. It was reported that folic acid plays important roles in synthesis of 5-HT. Therefore, we hypothesize that folic acid supplementation may cures premature ejaculation by the sam...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2010.11.006
更新日期：2011-03-01 00:00:00
abstract：:Chronic viral liver disease may evolve to cirrhosis. The medical treatment to slow down this passage is based on anti-viral and anti-fibrotic properties of interferon. Recently, we evidenced significant increase of portal vein flow velocity and volume after a prostacyclin analog (iloprost) infusion in subjects without...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2004.05.017
更新日期：2005-01-01 00:00:00
abstract：:The concept of reentry as the most important element in a hypothesis for consciousness proposed by Edelman and Tononi is reviewed. Reentry, is a process of ongoing parallel and recursive signalling between separate neuronal groups along parallel reciprocally fibers that link these groups anatomically. Reentry alters t...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2004.03.007
更新日期：2004-01-01 00:00:00
abstract：:For many years there was a general belief that the enzyme renin, having been secreted into the circulation by the kidney in response to appropriate stimuli, initially generates the inactive decapeptide angiotensin I in the bloodstream. This is then converted to the biologically active octapeptide angiotensin II by ang...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1054/mehy.2000.1201
更新日期：2001-04-01 00:00:00
abstract：:Over the past decade evidence from multiple research trajectories have converged to provide evidence that impaired glucose metabolism and mitochondrial dysfunction in the brain are the critical issues laying at the root of Bipolar Disorder (BD). These developments have been paralleled by increasing recognition of the ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2020.110299
更新日期：2020-12-01 00:00:00
abstract：:September 17th, 2009 marks the 15th anniversary of Sir Karl Popper's death. Popper was an outspoken champion of critical rationalism, and a constant critic of authoritarian tendencies in science and society. He was also one of the spiritual founders of this journal and served on its first editorial advisory board. Pop...
journal_title：Medical hypotheses
pub_type： 传,社论,历史文章
doi：10.1016/j.mehy.2009.09.021
更新日期：2009-12-01 00:00:00
abstract：:What causes cancer? To date, this question is left with no answer. The scientific community keeps defining cancer as a proliferation of cells in an uncontrolled and uncontrollable manner. The hypothesis developed here through an understanding of the cancer cell's behaviour led to its re-definition, providing answers t...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1054/mehy.2001.1532
更新日期：2002-06-01 00:00:00
abstract：:Individuals with Down syndrome (DS) not only have increased risk of hypothyroidism, they also tend to develop a relatively novel mild form of neonatal hypothyroidism. One problem that may predispose those with trisomy 21 to hypothyroidism is the overexpression of the gene DYRK1A, which may have an affect on the thyroi...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2007.01.068
更新日期：2007-01-01 00:00:00
abstract：:The terminology of cerebellar ataxias encompasses a variety of sporadic and inherited debilitating diseases. Patients exhibit disabling deficits such as dysmetria, kinetic tremor and ataxia of stance/gait. We are currently lacking effective treatments in degenerative cerebellar ataxias. Animal models of cerebellar dis...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2008.01.009
更新日期：2008-01-01 00:00:00
abstract：:The staggering number of publications featuring the use of stem cells has revolutionized regenerative medicine research. Preclinical studies indicate that allogeneic human mesenchymal stem cells (MSCs) may be useful for the treatment of several clinical disorders, including sepsis, acute renal failure, acute myocardia...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2011.01.010
更新日期：2011-04-01 00:00:00
abstract：:Physiological levels of estrogen would seem to have a possible protective effect on hearing function and estrogen replacement therapy may delay hearing loss in menopausal women. Treatment of healthy menopausal women with Tibolone for 6 months resulted in improvement in audiometry results at low frequencies which was m...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2010.11.018
更新日期：2011-03-01 00:00:00
abstract：:Cancer cells have a greater need for energy and a ready supply of the building blocks necessary for the synthesis of macromolecules (nucleotides, protein, lipids) in order to duplicate genome and biomass. The hypothesis can be postulated that those precursors for synthetic processes, which can only be furnished by gly...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2012.06.002
更新日期：2012-09-01 00:00:00
abstract：:Primary hyperparathyroidism is one of the most common causes of hypercalcemia. Most cases result from sporadic benign monoclonal adenomas or hyperplasia. Increased body weight is consistently present in cohorts of patients with primary hyperparathyroidism. It has been shown that fat mass is the major determinant of se...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2010.08.039
更新日期：2011-01-01 00:00:00
abstract：:Along with oxygen, glucose is an essential macronutrient for most cells, a source of carbons for biosynthesis and energy. However, alongside this indispensable role for cell survival and growth, glucose is intrinsically toxic by reacting with primary amines such as lysine in proteins in a non-enzymatic glycation proce...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2005.02.017
更新日期：2005-01-01 00:00:00
